Don’t Update Your Municipal Wastewater Treatment Plan Until You Read These Tips

The Federal Water Pollution Control Act changed how wastewater discharge was handled. The goal was to help keep biological and chemical contaminants out of U.S. waterways. Over the years, changes were made. They included:

  • 1977, 1981, and 1987 saw amendments made after the original amendments in 1972.
  • Secondary treatment regulations were enacted in the mid-1970s and changed in 1985.
  • The National Pretreatment Program Rule came out in 1978.
  • A National Municipal Policy was enacted in 1984.
  • Stormwater rules came out in 1990 and were updated in 1999.
  • Rules regarding the use and disposal of sludge came out in 1993 and raw discharge came to an end by 1996.
  • The Federal Clean Water Action Plan came out in 1998.

Each time the rules change, municipal water treatment plants need to make sure they can meet the new guidelines and rules. The U.S. EPA says that many wastewater and treatment facilities have outdated equipment that requires repairs or replacement.

It’s getting harder for wastewater treatment plants to keep up with the growing population and changes to wastewater pollutants. It’s estimated that 33% of new developments require systems such as septic systems. It’s the only way states can keep up with the growth and spread from cities with wastewater treatment plants.

To make sure they meet the current laws and regulations, make sure your municipal water treatment plans are kept up-to-date. Before you make changes, read these tips to make sure you’re making the right decisions.

How Old Is Your Equipment?

It does cost a lot of money to replace the equipment in a wastewater treatment plant. That said, how much are you spending on repairs each year? Are you able to keep up with the demand? Has your equipment failed and created spills that led to fines?

While it can cost money to purchase and install new wastewater equipment, you can end up saving money. You won’t pay as much in emergency maintenance. It will cost less to run the equipment and production increases. In little time, you’ll recoup the money you’ve spent.

Can You Meet the Growing Population?

In your municipality, are you able to meet the needs of a growing population? If not, it’s time to expand your plant. You don’t want your wastewater treatment plant to become overloaded. When you expand, it may be worthwhile to build a system that’s larger than you need. This accounts for future growth, too.

If you can’t expand due to a lack of space, you can look for machines and technologies that increase capacity without taking up more space. For example, Lakeside’s H-PAC system is designed to take up less space while also reducing operating and engineering costs. You’ll be able to do more without having to build additions and buy up land for the expansion.

Energy Efficiency is an Important Factor

It’s estimated that water treatment plants and the water industry use as much as 4% of the nation’s energy. With demands for better wastewater treatment plans, there are also concerns over the cost of electricity. The EPA estimates that up to 40% of a municipality’s budget is for the wastewater treatment plant’s electricity. Public water systems usage of electricity accounts for as much as 80% of a municipality’s budget.

To keep from blowing a budget, there’s a need for wastewater treatment plans to look at the equipment that reduces operating costs. Water treatment is going to use energy. You have pumps and equipment using electricity 24/7. You can do your part by looking into equipment that can do the job correctly for the lowest operating costs.

How Much of a Hassle Do You Face if the Regulations Change Again?

Think about the last time the regulations shifted. Were you able to meet the changing regulations with ease or was it a struggle? Taxpayers often balk when it comes to increasing town and city budgets by a large percentage, so you have to consider their ability to pay more in taxes, too. Upgrading equipment is one solution, but you might be able to make improvements with some modifications to your existing plan or by modifying your water treatment plant’s buildings. One of the easiest ways to decide is by working with professionals who are ready to help you find economical solutions.

Lakeside Equipment specializes in the design and installation of water purification systems for companies and municipalities. We also help you find the parts you need for your older equipment. With more than 90 years in the industry, you can trust Lakeside to find you the best solutions for your water treatment plan.

Let us know more about your goals. We can help you come up with the best plan for your budgetary needs. Give us a call today at 630-837-5640.

Is Tap Water in the United States Safe?

The media has brought a lot of attention to the situation Flint, Michigan, residents face with unclean drinking water. It has many wondering if the tap water in the U.S. is safe. Yes, it is. Since the discovery of lead in Flint’s water, replacement of lead and galvanized steel water lines has been an ongoing process. More than a dozen people were also charged with causing or adding to the water crisis.

The truth is that the U.S. has about 155,000 public water systems. Each one undergoes regular testing to ensure water quality. Water quality in the U.S. is outstanding thanks to laws and regulations that have been enacted or improved upon since the 1970s. Here’s a closer look at some of these improvements and how water becomes safe for drinking.

The History of Public Water Systems

The nation’s first water system came about in the 1770s. Hans Christopher Christiansen helped change the history of water systems by creating a public water system in Bethlehem, Pennsylvania.

By the end of the 1700s, Providence, Rhode Island, and New York City joined the list. Rhode Island brought in water deliveries from private companies. New York City had used private wells, but those polluted wells lost favor and created the Manhattan Company for public water. It would take until 1842 that NYC started tapping into the Croton River for water supplies.

As the years passed, it became clear that water was a leading reason for the spread of disease. By the end of the 1800s, cities were using sand filters or chemicals to clean water. The first drinking water standards came out in 1914. The Service Drinking Water Standards set limits on the number of bacteria allowed in water supplies. Within a year, chlorine was being used to disinfect water.

With the change to water quality, diseases linked to drinking water sharply declined. WWII came and brought about the use of organic chemicals that were making it into water sources. The Safe Drinking Water Act passed in 1974 and required that public water sources be tested to ensure contaminants fell below the levels required by the EPA.

Steps Taken to Bring Clean Water to Homes

The Safe Drinking Water Act requires water to be tested regularly. Water tests look for more than 90 items. If the contaminants are not lower than the EPA or state’s minimum standards, the water system fails and the public is told to stop using the water until the problem is found and resolved. Those tests look for things like:

  • Bacteria – E-coli, fecal coliform, and legionella are a few that are tested.
  • Disinfection chemicals – Examples are bromate (may cause cancer) or chlorite (increases the risk of anemia)
  • Inorganic chemicals – Many are checked and include things like arsenic, cyanide, and lead
  • Organic chemicals – Examples are Benzene (may cause anemia) and PCBs (increases the risk of cancer)
  • Radionuclides – Cancer-causing materials like uranium

Multiple steps are taken to bring clean water to a home or business. It starts with the water source. That water source could be a reservoir, river, lake, or pond. Water is drawn from the water source to the water treatment plant. Screw pumps control the rate at which water enters a water treatment plant. Once the water is at the plant, several steps take place.

#1 – Screening

Screening is a process where larger items like leaves, trash, sticks, etc. are filtered and removed using a screen rake. Those items can then be composted or sent to a landfill. It’s an important step as larger items could damage equipment if it’s not screened and removed.

#2 – Clarification/Flocculation

Clarification systems continue the filtration process to bring you to clean water. Sludge falls to the bottom of the tank where a scraper pushes it to the sludge sump where it can be pumped out.

For solids that float the surface, such as oils, skimmers at the surface of the water take care of those. Chemical additives act as a binder to get these materials to clump together in a process known as flocculation. Flocculation paddles mix the chemicals with the water to ensure it’s mixed well.

#3 – Filtration

Floc from the flocculation process is trapped as water goes through filters on the way to a closed tank where the water will be disinfected. MicroStar Filter systems filter out even tiny particles like algae and phosphorus by passing the water through a stainless steel cloth filter.

#4 – Disinfection

Disinfection is the final step. For any bacteria or microorganisms that survived the other steps, chemicals like chlorine are added to kill them off. UV lighting and reverse osmosis systems can also help disinfect the water. From there, it goes into storage tanks or to homes and businesses.

Choosing the Right Water Treatment System Requires Experience

Lakeside Equipment started helping cities and towns create water purification systems back in 1928, long before the government passed the Safe Water Drinking Act. That’s a long history in the business of water treatment system design and installation.

Today, Lakeside Equipment assists with the design, installation, and repairs of water treatment systems in North America. The single goal of providing clean, safe water has never changed. Call us at 630-837-5640 to discuss your water treatment project.

How To Effectively Remove Grit From Wastewater

What is grit? It’s the particles of sand and silt that end up in wastewater. It could be sand and gravel that’s spread to give traction on icy roads. It could be the dirt and sand you wash off your hands after doing some gardening or yard work. It can be coffee grounds, foods that go through a garbage disposal, or seeds.

When grit gets into wastewater treatment equipment, it’s destructive. It can wear down the mechanical components. It can lead to partial blockages that affect the water flow to digester tanks. Grit can end up costing a company too much money in repairs, replacements, and slowed processing.

How do you get rid of grit in the wastewater you’re processing. A grit removal system is ideal. You need one that works effectively and is designed to last.

How Grit Removal Works

As wastewater enters a water treatment plant, screens catch larger materials like sticks, trash, and plastics. The screens get finer as the wastewater flows through the plant, but sand and silt keep passing through.

There are different types of grit removal systems. To find the right system, you have to look at the type of grit you frequently process. Your options are:

  • Aerated Grit Chamber – Wastewater is forced to flow in a spiral rotation and particles that are heavier than the water sink to a bottom tank.
  • Detrius Tank – This is a square tank where a mechanical rake continually scrapes grit from the bottom of the tank and drags it to an auger where it is removed.
  • Horizontal Flow – A horizontal flow grit chamber is one of the first types of grit removal systems. As the water flows horizontally, the grit settles to the bottom of the channel where it is scraped away or lifted out using conveyors or a bucket elevator system.
  • Hydrocyclone – Water is forced into a cyclone that forces the grit along the sides and bottom of the chamber.
  • Vortex-Type Grit Chamber – Wastewater flows through a cylindrical tank creating a vortex. Gravity forces heavier grit to the bottom of the tank where it is pumped out.

There are pros and cons to each system. Aerated grit chambers allow for differing flow rates. You can also start adding chemicals to them.

Horizontal flow grit chambers allow you to adjust the flow. Hydrocyclone systems can remove solids and grit at the same time.

Vortex-type grit chambers are better at removing fine grit. They don’t have parts or bearings that sit below the level of the water, so they last longer and need less maintenance. The systems are also smaller and take up less space. Similarly, detritus tanks also have all mechanical components above the water.

With any of these systems, if the raking system is not mechanical, you’ll spend more time keeping them clean. Aerated grit chambers can be smellier. Plus, they often take more power to operate.

Detrius tanks do not allow you to control the water flow. If you install this in a shallow area, you may find grit gets through more often. Horizontal flow grit chambers also can be difficult to control the flow rate. Bearings and other equipment are underwater and can wear out more quickly.

Vortex-type systems with paddles may end up with debris caught on the paddles if anything gets through wastewater screening. Grit pumps can also clog frequently. They also need more space because they are deep.

What Types of System Do You Need?

When deciding which grit collection system is best for your needs, carefully weigh the amount of space you have, how fast the water flows, and how much grit you typically have in the wastewater. Lakeside Equipment sells several systems.

Aeroductor Grit Removal System – Grit is washed and collected at the bottom of the chamber where it is then pumped out. There are no underwater parts, which helps prevent excessive maintenance. It’s also meant to last thanks to the stainless steel construction.

Grit Classifier – The Grit Classifier is paired with the Aeroductor or SpiraGrit. It processes the grit that leaves the grit removal system and sends any overflow back to the water treatment system.

H-PAC – The H-PAC system pairs with wastewater screening systems and the vortex-type grit chamber to create a system that screens the wastewater and removes grit for less money at high flow rates. It takes less space and is affordable.

In-Line Grit Collector – This is an affordable system that’s all-in-one. It has the chamber where grit settles after it’s been aerated. A grit screw removes the grit.

Raptor Grit Washer – Using vortex forces and gravity, grit is collected and washed. It can work with several flow rates, and usually removes around 90% of the grit that enters the system. The system is smaller and doesn’t take up a lot of space.

SpiraGrit Vortex Grit Removal – If you have varying flows and need as much grit removed as possible, the SpiraGrit is a good choice. Its stainless steel design resists corrosion, and there are no underwater bearings to help with maintenance costs. It also takes up less space than other systems.

Call Lakeside Equipment to talk about your water treatment plant’s goals. We can help you design a grit removal system that boosts your processing times while providing a system that is designed to maximize grit removal. We can also help with replacement parts and service. Give us a call at 630-837-5640.

How Screening Removes Waste During Water Treatment

When wastewater reaches a water treatment plan from a sewer or truck that transports septic system wastewater, it goes through two main stages. Each stage has several steps. It starts with screening and a trip through the grit chamber and into the sedimentation tank. The second stage involves more filtering, disinfecting, and, possibly, dechlorination.

That’s just wastewater treatment. There are also processes specific to hydropower plants and factories like steel mills or pulp/paper mills. Each one requires water to be treated before it’s returned to the rivers, lakes, and oceans nearby. Each one involves screening to remove debris that could damage the pumps and other treatment equipment.

Screening is a critical first step. There are items in wastewater that can create blockages and damage water treatment equipment. Items like tampon applicators, diaper liners, sanitary pads, baby wipes, and condoms are not meant to be flushed. People do it anyway.

In a hydroelectric plant, a storm or high winds can send leaves, branches, and entire trees into the waterways. That’s why screening is an important first step in any of these industries.

How Does Screening Work?

As water enters a treatment plant or other facility, it goes through a variety of stainless steel screens. The size of the screening determines what the screen filters. You have wide screening to catch sticks, branches, and items like water bottles, soda cans, and plastic bags. Water is able to flow through, but the debris cannot.

As the size of the screens decreases, it catches smaller particles and items. Finer screen products can capture sludge, grease clumps, and other solids. Screens are paired with rakes that remove the materials from the screens to prevent clogging.

Wastewater enters the first screen and materials are caught on the screening. When the water level is high enough, the trash rake moves over the screen to remove the debris. This keeps water flowing through the screens. After the rake finishes its pass, the debris is moved to a collection bin. The trash rake makes a second pass where the rake is cleaned and readied for the next pass.

Debris is moved from the collection bin on a conveyor where it is washed and moved to a debris container. From the debris container, that debris could go to an incinerator, landfill, or composting area.

What Happens After Screening?

One thing screens cannot capture is the fine sand and grit that finds its way into wastewater. Sand from winter road maintenance, silt from rivers, and other fine materials pass the screens and settle into the bottom of the grit chamber where it can be removed.

At this point, there can still be tiny particles. They are processed in a sedimentation tank where they’ll combine to form solids that are removed through pumps. Sludge from sedimentation tanks may be processed into fertilizer pellets.

By the time the next stage of treatment starts, around 85 percent of the organic materials in wastewater have been removed. To remove the rest, it may be filtered through layers of stone or materials where bacteria consume the organic matter. The other option is to move the water into a tank where the wastewater is aerated and mixed with bacteria that will break down the rest of the matter. The remaining liquid is aerated again and pumped to a new tank where it will be mixed with chlorine to kill off any remaining bacteria.

In most states, it’s required now that the chlorine is removed before the water is returned to bodies of water to prevent harm to the plants and fish. If chlorine is not used to disinfect, ozone or UV lighting are used instead.

The treated water may end up back in watersheds where it is recycled as water that is piped to homes and businesses in nearby towns and cities. Before it can be sent back to homes, it is tested to make sure it is safe for consumption.

How Big or Small Are These Water Treatment Screens?

Lakeside Equipment sells Raptor Screening products. Rotary Strainer Screens are in a cylinder that sits horizontally. The wire openings start at 1/10th of an inch down to 1/100th of an inch for fine screening.

The Fine Screen can capture solids and organic materials in a cylindrical basket. There’s a Rotating Drum Screen that ranges from 1/4th inch to 1/50th inch in size. We also have trash rakes and other water treatment parts and equipment options.

Those are some of the options that can help you remove waste. Talk to our specialists to learn more and come up with the best screening products for your business’s or plant’s needs. Contact us to let us know how we can help.

Hydropower Trash Rakes: Keeping Water Flowing And Power Generating

According to the World Energy Council, water supplied 71% of the world’s renewable energy in 2016. Hydropower stations generate electricity by capturing the energy from flowing water. That water may be flowing in a river or from a reservoir. It works like this:

  1. Water rushes from a high point to a low point. A dam or natural incline of a waterfall can create those high and low points.
  2. As the water falls, it forces the blades of a turbine to spin. The action of the turbine converts the falling water’s energy into a mechanical form of energy.
  3. Generators that are connected to the turbines take that mechanical energy and convert it into electricity.
  4. Power lines send the electricity from the generators to homes and businesses.

There’s one more aspect to this that’s essential to proper operations. The water entering the turbine can’t be filled with trash. The EPA believes around 80 percent of the trash found on beaches came from the land. Much of it is food packaging and beverage cans and bottles. When that trash and recycling finds its way into rivers and into hydroelectric power stations, it can damage equipment and impede water flow.

Is That Much Trash Really in Our Waterways?

The amount of trash and debris in rivers is astounding. In 2010, the Great Mississippi River Cleanup began. In less than a decade, volunteers have already removed more than 513,000 pounds of trash and recycling from the river.

Each year, Riverkeeper Sweep volunteers clean up trash from the shores of the Hudson River in New York. In 2018, 38 tons of trash was removed.

Where does all this trash come from? Trash may fly out of a truck bed when it’s not secured. Some flies out of open car windows on a gusty day. It can be deliberately tossed out. People may not properly dispose of food packages after a picnic. Wind can blow it from recycling containers and dumpsters that are not closed. To prevent this from happening, consumers need to be careful about disposing items and reusing packaging as much as possible.

You also have the debris that naturally ends up in waterways. An old tree on the bank of a river may fall in after a storm. Branches may snap off trees after an ice storm and end up in a river. Leaves that fall off the trees in the fall will end up in some of the nation’s rivers. That debris is biodegradable, but it can clog the screens on water intake pipes at hydroelectric plants and cause problems.

How Do Hydroelectric Plants Keep the Trash Out?

There are two components to trash and debris removal at a hydropower station. Trash or bar racks are metal screens placed over a water intake pipe. These metal grids prevent things like fallen branches, trash, and recyclable containers from going into the pipe connected to a turbine.

Those screens need to be cleared from time to time. That’s the job of a hydropower trash rake. The rake removes the debris and trash from the screen automatically. This keeps the screen clear so that operations are not impeded.

If the screen is not cleaned, air bubbles can get in and damage the turbine. Low water pressure is all it takes for the air bubbles to form It could be from a blocked screen or low water levels in a river or reservoir. To prevent pockmarks in the turbine blades and the vibrations that can come with it, the plant must shut down and wait until water flow is corrected. This can cause power outages for people served by that plant.

Hydropower trash rakes can work quickly. Catronic Series Trash Rakes clear a 200-foot section at depths of up to 100 feet. The ability to lift up to 20 tons makes it a powerful system for removing fallen trees from trash racks. The hydropower trash rake can work automatically or with someone operating the system and manually removing logs, trash, and other forms of debris.

What does your hydroelectric power station need to keep equipment in prime condition and working efficiently? The professionals at Lakeside Equipment Corporation can help you find the perfect solution. Call 630-837-5640 or email sales@lakeside-equipment.com for more information.

How Water Treatment Solutions Are Keeping The Planet Greener

When the Clean Water Act took effect in 1972, regulations came into play that kept untreated wastewater out of streams, rivers, lakes, seas, and oceans. Why was this necessary? Prior to the act, some rivers in the U.S. were so polluted that they were deemed unsafe for recreational activities like swimming or fishing.

Contaminated water led to toxins in the fish people ate. That’s why there are limits on how much seafood you can safely consume today. Plus, it was changing the water sources. Harmful bacteria and algae thrive in some polluted bodies of water.

Today, wastewater treatment plants must hold Clean Water Act permits. Before any wastewater returns to a body of water, it must be cleaned. This includes water that goes into a city’s storm drains, water from sewers, and water that’s trucked in by companies that pump out residential septic tanks.

A Brief Look at the Clean Water Act

While the Clean Water Act wasn’t enacted until 1972, it actually dates back to the 1940s. The Federal Water Pollution Control Act put standards in place to help improve the quality of water sources like rivers, lakes, and oceans. It was completely revised and renamed in 1972 and became officially known as the Clean Water Act.

The basis of that act was to make it illegal to discharge any wastewater from a “point source” (container, drainage ditch, pipe, tunnel, etc.) into a water source without a permit. This included manufacturers, waste treatment plants, cities, and towns.

The National Pollutant Discharge Elimination System (NPDES) permit goes to companies who have the technology and procedures in place to limit bacteria and other pollutants from water that is discharged. To ensure companies are following the guidelines, random samples are taken from time to time and tested. These permits last five years.

Businesses and industries that hold an NPDES permit have 126 pollutants that must be monitored. Of that number, 65 of them are considered “priority” pollutants. These pollutants could be issues to humans or to the plants and creatures living in the many bodies of water throughout the U.S. Here’s an example of some of the priority toxins:

  • Arsenic
  • Asbestos
  • Cadmium
  • Chloroform
  • Cyanide
  • Methyl mercury

 

Despite the changes over the years, many bodies of water in the U.S. still deal with pollution. From 1990 to 1994, the Environmental Working Group reports that the Mississippi River had more than 702 million pounds of toxic materials released into the river. More than 35 million pounds were released into the Pacific Ocean from three of the West Coast states. The Ohio River was next with more than 22 million pounds. It’s clear there is still work to be done.

How Is Wastewater Cleaned?

Many decades ago, mixing raw sewage into a water source was an effective way to purify that wastewater. The bacteria and creatures in the water would eat the organic matter. As the population increased, there was too much waste for this process to be effective. That’s why water treatment plants developed.

The first stage in a water treatment process involves separating large items like paper, sticks, and plastic items from the liquid. Screens capture the larger items and allow the remaining wastewater through to the next stage. Trash rakes remove those items from the screens to prevent clogs. Wastewater goes into a grit removal system to separate the smaller particles like sand and small stones and aerate the remaining wastewater.

After grit is removed, the wastewater goes to a sedimentation tank to help further remove sediment. It goes through a filter and is aerated more with waste falling to the bottom and the aerated water going out through the effluent pipe. Eventually, chlorine is added to kill any remaining bacteria. Depending on state laws, the chlorine may need to be removed prior to going back into a water source.

For 90 years, Lakeside Equipment Corporation has specialized in water purification systems. The companies original goal was to ensure people had safe drinking water in their cities and towns. Since then, expansion has led to water and wastewater treatment solutions in all of North America and many other countries around the globe. What are your water treatment goals? Call us at 630-837-5640 to talk to a specialist about water treatment solutions that fit your budget and needs.

What Is The Difference Between Wastewater Screening And Filtering?

The importance of water treatment is an ongoing issue when it comes to public health and safety. Water treatment facilities and their equipment are used across the country to treat, or to remove the harmful properties from it. This is generally done by wastewater treatment plant facilities, whether publicly or privately operated. Wastewater, which is comprised of anything from toilet flushes, sinks, dishwashers, washing machines, or from industrial, commercial, or agricultural runoff. Since it can contain chemical pollutants, it is most necessary that it be treated for safe use and consumption. Facilities that clean wastewater, such as water treatment centers clean it before discharging it back into the environment. This is done through a multi step process. Let’s explore this process further.

What is Wastewater Screening?

Wastewater Screening is the first unit operation used at wastewater treatment plants (WWTPs). Screening removes objects such as rags, paper, plastics, and metals to prevent damage and clogging of downstream equipment, piping, and appurtenances.

There are different types of wastewater screens which include coarse screens, fine screens, and communitors and grinders (which are typically used at a smaller treatment facility). Screens can be made of a simple trash rack, or can be as complex as a mechanical bar system. There are also hydrocyclone systems which are devices used to separate liquids from solids, or grit from sludge, directly from the wastewater. The EPA identifies the specifications below for the varying types of screens.

Coarse screens remove large solids, rags, and debris from wastewater, and typically have openings of 6 mm (0.25 in) or larger. Fine screens are typically used to remove material that may create operation and maintenance problems in downstream processes, particularly in systems that lack primary treatment. Typical opening sizes for fine screens are 1.5 to 6 mm (0.06 to 0.25 in). Very fine screens with openings of 0.2 to 1.5 mm (0.01 to 0.06 in).

Another mechanical screen component are comminuting and grinding devices (which consist of rotating slotted cylinders) are installed in the wastewater flow channel to grind and shred material up to 6 to 19 mm (0.25 to 0.75 in) in size. There is also hydrocyclone systems. This is a system that separates liquids from solids directly from the wastewater. Heavier grit and suspended solids collect on the sides and bottom of the cyclone, while scum and lighter solids are removed from the center through the top of the cyclone.

What is Wastewater Filtering?

Wastewater filtering is another step in the process of the water treatment process. In order to safely consume water for drinking, for example, the wastewater needs to have dangerous contaminants reduced below EPA limits. To treat the water secondarily (after screening), a filtration process is used. The type of filtration system that is used depends on the facility, but a trickling filter system (also known as activated sludge process) is often used. In this process, wastewater is pumped into an area that has about the to six feet of stones, essentially into a tank that is aerated  so it will produce the growth of bacteria.

On these stones, bacteria attaches to its surfaces, and then the bacteria consume and break down the matter that passes through the area. The bacteria are responsible for breaking down the organic matter among the sludge that flows into the tank. Afterward, the water goes through an additional round of treatment.

After the water leaves the sedimentation tank in the secondary stage of the treatment process, it is sent into tanks where it is exposed to chlorine (or ammonia), which can kill up to 99% of the bacteria. This is, of course, a very important step in the process.

The Difference Between Screening And Filtration

Don’t forget that there are also water filters that can be purchased for your business or home, that come in a myriad of shapes, sizes and costs. Water filters are available to support a home’s principal water resource, to attach or connect to a faucet, and they are even available for an individual water bottle, too. Water filters can be stationary or portable, depending on your usage (bathrooms, swimming pools, drinking water). While filters are an excellent resource, they do need to be maintained over time — just as equipment and a water facility does.

This might have given you a better idea of the way a water filter can be used. Now that you have this image, you can see that in the wastewater treatment process the screening is really the preliminary step that removes ‘larger’ organic matter, and then the filtering process is one that further removes any impurities.

The Wastewater Treatment Process

The wastewater screening and filtration process are crucial for creating and maintaining water that is safe for human use and consumption. There are various kinds of technology used for this process, but you can imagine that a degree of efficiency and reliability ensure the process runs seamlessly. Since water is among — if not THE — most precious resource, we must use high quality materials and a consistent, responsible process for treating it.

Water at its natural state contains undesirable sediments, colors, algae and other organisms that can be harmful. For these reasons, water treatment is a process that is paramount. To keep water treatment processes pure, equipment such as tanks, filter bed and other work areas must be clean and maintained properly. They must follow the Environmental Protection Agency’s regulations and ensure the highest standard of safety it met. When it comes to our health and safety, you want to be able to trust the screening and filtering processes that purify our water. Lakeside Equipment Corporation uses high quality materials and designs that have been engineered specifically for this process. Contact Lakeside Equipment today to find out more about how we can help you with your water treatment needs!

How Wastewater Screening Equipment Works

Wastewater is one of the most common forms of pollution, and in the United States there are wastewater treatment facilities to control this. According to the Environmental Protection Agency (EPA), wastewater contains large solids and grit that can interfere with treatment processes or cause undue mechanical wear. Over time, this increases maintenance on wastewater treatment equipment. In order to minimize problems, these materials require separate and special handling and maintenance. The EPA recognizes preliminary forms of wastewater treatment as screening, grit removal, septage handling, odor control, and flow equalization. Facilities that clean wastewater, such as water treatment centers clean it before  discharging it back into the environment. This can be done with machinery (both manual and mechanical). Machinery that has been especially engineered for wastewater treatment is most efficient. Let’s take a deeper look at some of the ways wastewater screening works.

Wastewater Screening Devices

In general, wastewater screening devices are classified based on the amount of material that is being removed from them. The design elements that classify screening equipment are size, depth, width, the screen’s angle, approach velocity of the channel, the discharge height, wind and other aesthetic considerations. There are different types of screening devices, both manual and mechanical.

There are different types of wastewater screens which include coarse screens, fine screens, and communitors and grinders (which are typically used at a smaller treatment facility). Screens can be made of a simple trash rack, or can be as complex as a mechanical bar system. There are also hydrocyclone systems which are devices used to separate liquids from solids, or grit from sludge, directly from the wastewater. The EPA identifies the specifications for the screens below:

Coarse Screens – Coarse screens remove large solids, rags, and debris from wastewater, and typically have openings of 6 mm (0.25 in) or larger.

Fine Screens -Fine screens are typically used to remove material that may create operation and maintenance problems in downstream processes, particularly in systems that lack primary treatment. Typical opening sizes for fine screens are 1.5 to 6 mm (0.06 to 0.25 in). Very fine screens with openings of 0.2 to 1.5 mm (0.01 to 0.06 in).

Communitors and Grinders – Comminuting and grinding devices (which consist of rotating slotted cylinders) are installed in the wastewater flow channel to grind and shred material up to 6 to 19 mm (0.25 to 0.75 in) in size

Hydrocyclone Systems – This is a system that separates liquids from solids directly from the wastewater. Heavier grit and suspended solids collect on the sides and bottom of the cyclone, while scum and lighter solids are removed from the center through the top of the cyclone.

Manual and Mechanical Screening Equipment

There are both manually cleaned and mechanically cleaned bar screens. A bar screen is essentially a heavy duty screen that uses a reciprocating rake which cleans the wastewater bar screen by pulling out debris.

In general, manually cleaned screens will require frequent raking to avoid them getting clogged up. This also avoids a buildup of solids on the screen itself and backwater levels from rising. Keep in mind that this manual work will require more labor costs over time. The time that is taken to clean the screen manually will also detract from the time it is serving its purpose, which can also cause overflow of waste solids.

Mechanical screens, on the other hand, aren’t subject to the same concerns, but they do require higher maintenance costs. Overall, you want to make sure you have a system that is the most efficient for your facility and needs. The Environmental Protection Agency suggests that plants utilizing mechanically cleaned screens should have a standby screen to put into operation when the primary screening device is out of service — which is a standard design practice for many newly designed plants. Having a replacement screen will prevent clogging and backup, similarly to concerns for when a manual screen is being cleaned. Larger facilities are more likely to use a mechanical screen in order to reduce labor costs (as the equipment is more costly itself), and to improve the conditions of the overall flow of the wastewater and water treatment  process. The cost for screens varies, of course, depending on the technology that is used and that is available in each particular area.

Efficient Wastewater Equipment

Our wastewater treatment equipment is efficient in that it screens, washes, compacts and dewaters in one smooth, seamless operation. This equipment is designed to handle wastewater, septage, sludge, scum, and grease.  Our equipment offers:

  • Compact design with screening and grit removal in one unit
  • Security control station allows access for authorized haulers
  • All stainless steel construction resists corrosion
  • Available for indoor or outdoor environments
  • Multiple sized units to suit your application
  • Unload up to two (2) waste haulers at the same time

Selecting A Wastewater Treatment System

When considering a wastewater treatment system, you want to select one that is appropriate for your needs. Keep in mind your location, facility, anticipated costs, the size of the system, and its overall functioning. One of the most important components of a water treatment system is the screen. As discussed, screens come in different sizes, depths, widths, and different designs according to the technology available in the area as well as for your budget. Overall, mechanical screens are commonly used in larger treatment facilities and require lower labor costs.  No matter what type of equipment you choose, it is important to have a backup screen so your operations can run smoothly, avoiding backup and unnecessary problems. If you are looking for a water treatment system, take a look at our specially engineered equipment with quality materials which has been made to maximize efficiency and minimize setbacks.

How Grit Collection Technology Helps Keep Equipment Running and Water Cleaner

What is grit collection technology? Before you can think of that, you have to think about grit. Grit is the fine particles of matter like sand, sludge, and other abrasives found that finds its way into sewers and septic tanks or that comes from rivers, lakes, and streams.

Wastewater grit is especially troublesome. It’s more than sand. It can be eggshells, bones, and coffee grounds that go down the sink. It can be the sand and gravel that washes from a street into a sewer drain. These materials are never a consistent size or shape.

Now think about the industrial settings and treatment plants that encounter grit in water or other liquids. Not only can they clog equipment, but the abrasive materials wear down parts over time. It gets costly. Grit collection technology is the equipment and processes that clear grit and other particles from water before it’s used in industrial or residential settings.

How Does a Wastewater Treatment Plant Clean the Water?

Wastewater treatment plants use grit collection technology every day. Not only must these plants remove odors and bacteria, but they also need to take the wastewater and make it clean. This is a multi-step process.

  1. A screw pump controls the rate at which water flows. Bearings are important to the screw pump’s lifespan, so you want quality components. Lakeside Equipment has engineers that look at the lift and flow rates you need, and consider those with the incline and required speed in order to develop the ideal pump for you.
  2. Screens filter all large materials like paper towels, plastic wrappers, and toilet paper to prevent damage to pipes and avoid clogs. As wastewater continues through the equipment, the screens get smaller and smaller. Screens may start with gaps of 1.5 mm and go as small as 0.06 mm. To clean the screens, there may be a trash or screen rake that automatically clears and removes the debris.
  3. In between the different screen sizes, there are grinders that grind the waste. The idea is to keep grinding the waste and catching it in filters until the water that passes is clean.
  4. There are also comminutors that capture the large material and chop it into more uniform sizes for the grinders to work with.
  5. Grit chambers and grit collectors are the pieces of equipment that collect the grit so it can be taken to a landfill or facility for disposal.

To get to the cleanest water possible, you need a system that effectively filters out silt and other particles. These steps are all part of the basic process. There are several systems available, and each works a little differently depending on the components you choose.

Types of Grit Removal Systems

Lakeside Equipment Corporation specializes in several types of grit removal systems. There are advantages to each one.

Aeroductor – The Aeroductor system avoids having any motorized parts that are submerged. It can be constructed from stainless steel to prevent corrosion. Its biggest benefit is that it can separate and wash grit at the same time.

Headworks Packaged System – H-PAC systems are stainless steel and prevent corrosion. It has by-pass options for the grit chamber and screen.

Grit Classifier – There are several types of Grit Classifier systems to allow you to find the best solution for your needs. A screw conveyor gets rid of grit that is ready to be disposed of. That screw conveyor is designed for strength and durability.

In-Line Grit Collector – In-line is an affordable system that uses aeration to keep particles from settling. It’s best for a system where the flow rate is under 6.0 million gallons per day. Motorized parts remain above water for easy maintenance.

Raptor – If you need a grit removal system that has a conical design where grit and particles are washed and separated with precision, the Raptor Grit Washer is a good choice. It’s made from stainless steel to help prevent corrosion. It handles a variety of flow rates and reaches grit discharge rates of 90 percent.

SpiraGrit – With SpiraGrit, you get a compact system that doesn’t take up much space. The bearings are not submerged and the components do not corrode quickly, which makes maintenance a breeze. It handles all flow rates.

What You Need to Consider

Whether you’re replacing equipment or planning a new system, you need to carefully weigh the water flow rates, longevity, and requirements. Experts can help you decide the best grit removal technology for an efficient, effective treatment system.

Would you like more information on equipment that helps with grit removal? Use the online form to get help finding the right system for your needs. You can also call (630) 837-5640.

How Technology and Data Is Improving Wastewater Treatment

Since government water quality standards were required, water is nothing like your ancestors experienced. Still, there are improvements that can be made. Using data and technology, wastewater treatment engineers continue to make strides to ensure that people throughout the world have clean, safe water.

A Brief History of Water Treatment Practices

Civilizations like Ancient Greece, Ancient Egypt, and Mesopotamia all strived to dispose of human waste to keep water sources clean. In the United States, Hans Christopher Christiansen helped launch the nation’s first public water department in Pennsylvania in 1755.

Baltimore, Maryland, and Boston, Massachusetts, were the first two cities to create municipal water treatment plants. Diseases like cholera were running rampant. These did not come into fruition until the mid-1800s. It wasn’t until the 1910s that chlorine was used to sanitize water. World War II led to new discoveries on treating water to make it clean and safe.

Surprisingly, despite the advancements, the U.S. government did not pass the Safe Drinking Water Act until 1974. At this point, tests were used to make sure the levels of certain contaminants were monitored and maintained.

Understanding How Wastewater is Processed

Wastewater is the water that travels through sewers or is trucked in after septic tank cleanings. It comes from washing machines, dishwashers, sinks, bathtubs, showers, and toilets. In a sewer, it also contains water that drains from streets on a rainy day or when the snow melts.

Wastewater contains everything from soap and cleaners to food scraps and human waste. It can be the water that comes from an industrial setting like a paper mill or manufacturing plant. For this water to be reused or returned to lakes and streams, it needs to be filtered and cleaned.

Cleaning wastewater requires multiple steps. First, the solids need to be filtered out. The remaining water, known as effluent, continues going through smaller and smaller screens that keep filtering the grit. That grit is disposed of in landfills and other facilities that can process it.

Aeration adds oxygen that can help break down gases and assist materials in the effluent as they decompose. This secondary step continues to help get rid of grit and other materials.

The third step is to help separate the sludge and scum from the wastewater. Sludge settles at the bottom is moved to digesters. Scum, such as oils and plastic materials, float to the top of the tank where mechanical rakes remove them.

Filtration is a fourth step that helps remove bacteria by running the wastewater through sand or carbon filters. In addition to removing bacteria from the water, iron is also removed.

In the final step, the filtered water is moved to tanks where chlorine helps kill off any remaining bacteria. As the chlorine destroys remaining bacteria, it also breaks down leaving minute traces of the chemical. At this point, it’s ready to enter rivers and become part of a natural water source again.

How Do Data and Technology Help?

Computers have become an important component in wastewater treatment. Not only do they help with research and data, but they also run the CAD software that can help design the right system for your needs. Once the blueprints are in place, you’ll be able to pick the equipment you need. Field engineers have the training and hands-on experience to make sure installations of entire systems go smoothly. If there are hiccups, the engineers are on-hand to figure out and implement a solution.

The EPA maintains the Industrial Wastewater Treatment Technology Database to make it easy to find Clean Water Act rules and guidelines. This resource helps make it easy to research the latest advancements, which can help companies hone their wastewater practices. You can search by topic, industry, pollutant, technology, or download the entire database.

Technology alone has led to many advancements in productivity and operational costs. Wastewater treatment systems of the past relied on humans to manage many of the controls and processes. While today’s computers can adjust the flow rate of wastewater and clean screens, humans once had to carefully monitor and manage those aspects.

Motorized rake systems remove oils, plastics, and other trash now, but humans used to have to rake these materials out. Screens are cleaned automatically. Computers can take readings, store them for management to use, and this makes it easier to manage overall costs and expenses.

Lakeside Equipment has been helping with wastewater treatment since 1928. Engineers and other wastewater specialists work with companies to create effective water treatment systems. The company can keep operating costs down and ease maintenance and repair requirements. Complete the online form to talk to a customer service representative.