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How Do Hydropower Trash Rakes Work?

The importance of removing contaminants from wastewater cannot be understated. If wastewater is not properly treated before it is returned to the environment, it could harm the environment or negatively impact the health of people in the community.

The wastewater goes through a lengthy treatment process that involves a number of different steps. Early on in the process, the water is pushed through a screen, which filters out large pieces of debris. The debris must be cleaned off of these screens periodically, otherwise the screens will be less effective. To clean these screens, it’s best to use a trash rake.

What is a Trash Rake?

Trash rakes are heavy devices that are used to remove large pieces of debris from screens at hydropower facilities. Most trash rakes are designed with long arms that reach into the bottom of the basin. The arm of the trash rake then moves upwards across the screen, picking up pieces of debris along the way.

Some trash rakes simply drop the debris that is collected on a nearby deck so it can be manually removed by workers at the facility. Other types of trash rake move the debris away from the deck and drop it into a bin designated for this type of waste.

What Are Cable Operated Rakes?

There are two main categories of trash rakes: cable operated rakes and hydraulically operated rakes. A cable operated rake system consists of a cable winch and rake arm. The rake arm scrapes across the screen to remove large pieces of debris, which is then deposited in a dumpster.

The Catronic Series trash rack sits on the deck located above the screens. It can be used as a stationery unit to clean a single screen or as a moving unit that is capable of cleaning multiple screens. Another cable operated rake system is the Monorail Series trash rake. Instead of sitting on the deck, this type of trash rake moves back and forth along a monorail structure that is built above the screens. Because it moves along the monorail, this trash rake can be used to clean multiple screens within the same general area.

There are benefits to both the Catronic Series and Monorail Series trash rake systems. One benefit of the Monorail Series trash rake is it does not take up space on the deck, whereas the Catronic Series trash rake does. Both of these systems use low maintenance energy efficient equipment that can easily be repaired and cleaned away from the water that is being treated. The install for these raking systems is easy, too. This means facilities can install either one of these systems without having to replace their existing screens or make any other modifications.

What Are Hydraulically Operated Rakes?

Lakeside’s hydraulically operated rakes are ideal for hydropower plants, pumping stations, wastewater treatment plants, and other industrial applications.

The Hydronic T Series trash rake system features a telescoping design that can clean at inclinations of up to 90 degrees. This system can run without the use of chains, guides, and sprockets, which makes it easier to operate. The pressure that the rake applies to the screen can also be adjusted to minimize the wear and tear.

The Hydronic K Series trash rake system is designed with a long arm that can reach depths of up to 100 feet. The arm is also capable of removing larger objects from the water such as trees and rootstocks. Depending on your facility’s needs, the K Series system can remain stationary to clean a single screen or it can swivel or travel to reach other screens.

Another hydraulically operated raking system is the Hydronic Multifunctional (M) Series. The M Series is designed with an articulating arm and a telescoping rake that can reach depths of up to 150 feet. There are several different rake heads that can be used on this system, including a triple jaw gripper that is capable of lifting more debris, and an orange peel grapple that is ideal for removing debris from the bottom of the screen.

Although this system can be semi-automatic or fully automatic, there is also the option of manually operating it out of the driver cab. It is best to manually operate the system to remove large pieces of debris from the surface.

Finally, there is the Hydronic H Series trash rake system. The other systems mentioned above are designed to clean screens that feature vertical bars. However, the H Series trash rake system is specifically designed to clean screens with horizontal bars. This rake starts at one side of the screen and pushes the debris caught between the bars to the other side of the screen. Then, the debris that has been collected can either be removed manually or with a grab rake.

Self-Cleaning Screens

Trash rake systems are used to clean screens, however it’s important to note that there are also self-cleaning screens available. The CO-TEC screen, for example, is designed with rake teeth that can be extended between the bars on the screen. Once extended, the rake teeth can then be lifted upwards, dragging debris in the same way that a trash rake does. If the screens at a facility need to be replaced, this type of product should be considered. However, facilities that are not interested in replacing their existing screens should stick to a trash rake system instead.

To learn more about hydropower trash rakes or to place an order, contact Lakeside Equipment Corporation today. Lakeside Equipment Corporation has been committed to improving the quality of water resources for decades. We currently provide high quality products and reliable services to municipalities and companies around the world. Call 630-837-5640 or visit our website to connect with one of our knowledgeable representatives today.

Centrifugal Pumps vs. Positive Displacement Pumps

The pumps that are used to treat wastewater can be classified as either a centrifugal or positive displacement pump. There are pros and cons to both of these types of pumps, so it’s not always easy to determine which one is right for your needs. To make the right choice, it’s important to learn the differences between centrifugal and positive displacement pumps.

How Centrifugal and Positive Displacement Pumps Operate

To understand how these pumps are different, you must first learn how each pump operates. Positive displacement pumps draw a fixed volume of liquid into the pump through the suction valve, trapping it within a cavity found inside the pump, then forcing it out through the outlet valve. The manner in which the liquid is forced out through the outlet valve will vary depending on the type of positive displacement pump. For example, a piston positive displacement pump is designed to force liquid out using a piston that moves up and down through the body of the pump. Other positive displacement pump models, such as screw pumps and gear pumps, do not have components that move up and down. Instead, these pumps use rotating components to force liquid from one side of the pump to the other.

Centrifugal pumps are known for their simplistic design. The most important component of a centrifugal pump is the impeller, which is a rotating device that moves fluid through the pump. The impeller rotates to draw fluid into the pump, then transfers kinetic energy from the motor to the fluid, which moves through the pump and exits through the discharge valve.

How Pressure Affects the Flow Rate

One of the main advantages of a positive displacement pump is its ability to produce a consistent flow rate. The flow rate of a positive displacement pump will remain constant when there are changes in pressure.

However, this is not the case with centrifugal pumps, which are designed to react to changes in pressure. The efficiency of a centrifugal pump peaks at a specific level of pressure. Whenever the pressure is not at this specific level, the efficiency of this pump will decrease. Therefore, the flow rate of centrifugal pumps will be affected by changes in pressure.

How Viscosity Affects the Flow Rate

Another difference between centrifugal and positive displacement pumps is the way the viscosity of the fluid affects the flow rate. As viscosity increases, the flow rate of a centrifugal pump will begin to rapidly decrease. The exact opposite is true of positive displacement pumps. As the viscosity increases, the flow rate of a positive displacement pump increases as well. This is because highly viscous liquids quickly fill the internal clearances of a positive displacement pump, which produces a greater volumetric efficiency. For this reason, it is important to choose a positive displacement pump to handle liquids that are highly viscous.

Shearing of Liquids

The speed of the spinning impeller found within the centrifugal pump design makes it less than ideal for handling shear sensitive mediums. Positive displacement pumps are not designed with any high-speed components, which means these pumps will not apply a great deal of shear to mediums. Because of this, it is best to choose a positive displacement pump when handling mediums that are shear sensitive.

Suction Lift Capabilities

Some centrifugal pumps will have suction lift capabilities, however the standard models do not. Positive displacement pumps do have suction lift capabilities. Consider the piston pump, which is a traditional positive displacement pump model. The piston is the component that moves up and down to force water from one side of the pump to the other. When the piston moves upwards, the pressure in the body of the pump goes down, which will open the suction valve and allow water to flow freely into the pump. The suction valve will close when the piston moves downward and increases the pressure inside the body of the pump, which pushes the water out of the pump.

When to Use Centrifugal and Positive Displacement Pumps

When choosing a pump, it’s important to consider the conditions in which the pump will operate. It is best to use a centrifugal pump to handle a large volume of low viscosity fluid in a low pressure environment. The centrifugal pump works best when it is transferring water, however it can also handle the transfer of low viscosity chemicals and fuels.

Because of its simplistic design, centrifugal pumps can be made out of a number of different materials, including plastic, stainless steel, and cast iron. This makes it more versatile since its design can be adjusted to fit your needs. This type of pump is also very compact, which makes it the ideal choice when there is not much space for a pump.

Positive displacement pumps are often installed to pump oil, sewage, and slurry. Positive displacement pumps are also ideal for pumping fluids that contain solid materials. In general, positive displacement pumps are used whenever the conditions are not ideal for centrifugal pumps. For example, the flow rate of a centrifugal pump is greatly affected by changes in pressure. Therefore, it is best to use a positive displacement pump when there will be changes in pressure, since this will not impact the flow rate of this type of pump.

To learn more about centrifugal and positive displacement pumps or to place an order, contact Lakeside Equipment Corporation today. For decades, Lakeside Equipment Corporation has been committed to providing high quality and reliable products and services to customers around the world. Let us guide you through the process of finding the right centrifugal or positive displacement pump for your needs. Call 630-837-5640 or visit our website to connect with one of our knowledgeable representatives today.

Open vs. Enclosed Screw Pumps

For decades, engineers have used screw pumps for wastewater plant lift stations, storm water pumping, and other industrial applications. These pumps are used to move large volumes of liquid, but their design also makes it easy for large objects to pass through without clogging the system. This means water that is contaminated with various objects can be pumped with ease.

Screw pumps can also be operated when no water is present. This means there is no need to install additional parts to stop the pump from running in dry conditions. The pump can continue to operate regardless of how little water is present.

Screw pumps are not only efficient, they are also low maintenance. The pumps are designed with very few moving parts, and these parts constantly run at a slow speed. This innovative design minimizes wear and tear and the need for repairs.

Screw pumps can be used in a variety of industrial settings. However, there are two main types of screw pumps that engineers must choose between: open and enclosed. Before placing an order, it’s important to understand the differences between these two designs.

An Introduction to Open and Enclosed Screw Pumps

Before learning about the benefits of both open and enclosed screw pumps, it’s best to learn the differences between their designs.

An open screw pump has four components: a spiral screw, upper bearings, lower bearings, and a drive assembly. Open screw pumps are placed within concrete or steel troughs at a slight angle, leaving their screw-shaped design exposed.

Enclosed screw pumps are very similar to open screw pumps, however they are encased within a tube so their screw-shaped design is not exposed. Because the pump lies within a tube, it does not need to be placed within a cement or steel trough.

There are two types of enclosed screw pumps: Type S and Type C. Both of these types are enclosed within tubes, however the tube in a Type S design is stationary, whereas the tube in a Type C is not. Type C pumps are designed with two spiral flights welded to the inside of the pump’s tube, which rotates as it operates.

The Benefits of Open Screw Pumps

The open screw pump is known for its simplicity and reliability. These pumps are incredibly low maintenance as it is, however they can become even more durable. If the lower bearing is designed with a permanently greased lubricated roller bearing or a sleeve bearing, this will minimize the wear and tear even further.

If a repair is needed, it may be easier to identify the issue on an open screw pump than it would be on an enclosed pump. This is because the open design of an open screw pump makes it possible to see all of the moving parts.

The bottom of an open screw pump can operate in both submerged and non-submerged conditions, which makes it more versatile than other screw pumps.

The Benefits of Enclosed Screw Pumps

As previously mentioned, enclosed screw pumps are encased within a tube, which eliminates the need for a steel or concrete trough. Because it does not need a trough, it is considered easier to install than an open screw pump. It’s also a better choice for clients who are in need of a quick replacement and do not have the time to install a trough.

Both open and enclosed screw pumps are efficient, however the Type C pump operates at the highest efficiency. In fact, it is estimated that the Type C pump is between 5-10% more efficient than the open screw pump, which is why it has become a popular choice.

The Type C enclosed pump has a maximum inclination of 45 degrees, whereas the open screw pump and Type S enclosed pump both have a maximum inclination of 40 degrees. The difference between 40 and 45 degrees may not seem significant, but it results in the Type C enclosed pump leaving a much smaller footprint.

There are benefits to the Type S enclosed screw pump, too. The top of Type S enclosed pumps can be fixed in place or mounted onto a pivot. If it is mounted onto a pivot, the tube can be repositioned to adjust the pumping rate. Both the open and Type C designs do not have this flexibility.

How to Choose the Right Type of Screw Pump

There are benefits to both open and enclosed screw pumps, which can make it difficult to determine which is right for your needs. Instead of focusing on the design of the pump, think about how the pump will be used. These are the factors that should be taken into consideration when selecting a screw pump:

  • Capacity
  • Speed
  • Inclination
  • Number of Flights
  • Horsepower

For example, the number of flights in a screw pump will have an impact on the output capacity of the system. This is because each additional flight increases the output capacity of the pump by about 25%. Therefore, it’s important to calculate the maximum output capacity needed so you can determine how many flights you will need. By approaching the decision in this manner, you will be able to select the perfect open or enclosed screw pump for your needs.

To learn more about open and enclosed screw pumps or to place an order, contact Lakeside Equipment Corporation today. At Lakeside Equipment Corporation, we are committed to treating water so it can be used as drinking water or safely returned to the environment. Since 1928, we have provided local governments and corporations with the high quality services and top-of-the-line equipment they need to help us achieve this goal. Call 630-837-5640 or visit our website to connect with a representative today.

Roanoke VA Treatment Plant Uses Lakeside Equipment

Roanoke, Virginia Regional Water Pollution Control Plant treats 37 million gallons of wastewater a day. From 2015 to 2016 they had a major upgrade and expansion to their facility. New screw pumps were added for peak wet weather flow pumping when the Roanoke wastewater treatment capacity is exceeded.

The screw pumps elevate the un-treated wastewater to a flow equalization tank for off-line storage. The stored un-treated wastewater is later returned to the wastewater plant for treatment after the peak flow subside. The 114-inch screw pumps are some of the largest in the U.S.

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Screw Pumps provide a cost-effective and reliable method of pumping large quantities of water at low total dynamic head (TDH).

Create Positive Cash Flow from Septage Treatment Systems

A treatment plant frequently can easily add a septage receiving station to create a valuable source of revenue while also providing a needed service to the community and surrounding businesses. A wide range of features are available, but it all starts with a well-designed receiving system, built to handle a variety of hauled waste. The Lakeside Raptor® Septage Acceptance Plant and Raptor® Septage Complete Plant leads the industry for liquid hauled waste receiving systems and can be tailored for your unique needs.

Six Potential Sources of Materials

  • Septage waste, generally consistent and predictable in character.
  • Grease trap waste, typically high in oils and grease from restaurants.
  • Waste activated sludge from other treatment works.
  • Industrial waste, highly variable from one industry to another; these wastes must be tested for toxicity in the process and most likely require pretreatment.
  • Landfill leachate, potentially toxic often requiring additional testing and pretreatment.
  • Portable restroom waste, typically high in ammonia and total nitrogen, and often containing bottles and other large objects.

John Olson, P.E., a regional sales manager with Lakeside Equipment Corporation, described the essential features of septage acceptance stations. “The septage acceptance plant requires a heavy-duty design,” Olson said. “It should be fully automated so haulers can come in, swipe a card, and discharge their load. The decision to accept any hauled material becomes the plant operators’ responsibility. Therefore, the basic design should be customized to their needs.”

For more details on how to leverage your treatment plant to generate revenue for your organization and help to defray maintenance costs, provide needed upgrades and meet compliance requirements, check out the attached article or contact us

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