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Submersible Mixers and Recirculation Pumps

Submersible mixers and recirculation pumps are an excellent complement to the Sequencing Batch Reactor (SBR) and Closed Loop Reactor (CLR) Process that are designed for Biological Nutrient Removal (BNR) applications or energy conservation. The mixers and pumps have a stainless steel propeller that is shaped for optimum flow and a highly efficient planetary drive resulting in low energy consumption.

Low and medium speed submersible mixers are used to thoroughly mix the contents in the anaerobic tank, anoxic tank, or CLR aerobic reactor. This helps reduce power costs in low flow start-up conditions, where oxygen requirements are well below the mixing needs. In denitrification applications, the submersible mixer and aeration are cycled to provide anoxic and aerobic conditions within the SBR or CLR reactor for total nitrogen reduction.

Recirculation pumps are provided in denitrifcation applications to recycle mixed liquor from the aerobic basin back to the anoxic stage. The recirculation pumps are designed for high efficient pumping of large quantity of liquid at low head, which makes it ideal for BNR processes.

Spiraflo Clarifier

The Spiraflo is a peripheral feed clarifier designed for superior removal of suspended solids that could be used in a primary, secondary or tertiary clarification system. The wastewater enters the outer perimeter of the clarifier tank and is directed along the narrow raceway formed by the skirt and the outer wall. This flow pattern dissipates the wastewater’s hydraulic energy as it flows around the raceway, eventually spiraling down underneath the skirt and into the main settling area. The flow travels inward from the skirt towards the center of the tank, coinciding with the direction of the sludge, and the clarified water rises into the centrally located effluent weir trough. The combination of the spiraling flow pattern and the skirt eliminates all possibility of short-circuiting and provides better utilization of the total tank volume for more effective settling.

Spiravac Clarifier

The Spiravac is a peripheral feed clarifier designed for superior solids removal through suction orifices to ensure rapid return of active sludge to the process. The wastewater enters the outer perimeter of the clarifier tank and is directed along the narrow raceway formed by the skirt and the outer wall. This flow pattern dissipates the wastewater’s hydraulic energy as it flows around the raceway, eventually spiraling down underneath the skirt and into the main settling area. The flow travels inward from the skirt towards the center of the tank, coinciding with the direction of the sludge, and the clarified water rises into the centrally located effluent weir trough. The combination of the spiraling flow pattern and the skirt eliminates all possibility of short-circuiting and provides better utilization of the total tank volume for more effective settling.

The Spiravac Clarifier is available in two designs; the Controlled Removal (Type CR) which utilizes individual sludge removal pipes and adjustable riser pipes in a revolving sludge well, or the Direct Removal (Type DR) which uses a common header pipe with orifices that removes sludge to a rotating manifold at the center of the tank for withdrawal.

Full Surface Skimming

The peripheral-feed design significantly captures floating material in the clarifier’s outer skirt. This process may require full surface skimming to remove material in the main settling area. There are two types of full surface skimmers available:

The Motorized Full-Surface Skimmer extends the full width of the clarifier surface, from the effluent trough scum baffle to the outer race skirt. A drive assembly rotates the skimmer arm to clean the clarifier surface, and a hinged blade suspended from the skimmer arm pushes floating material to a rotating scum trough for removal.

The Full-Surface Ducking Skimmer is an economical alternative to the Motorized Full-Surface Skimmer. The full surface skimmer, which is supported by the clarifier’s scraper arms, moves the floating material to the scum trough for removal. The skimmer supports are hinged to allow the skimmer to duck underneath the scum trough during the removal process.

MicroStar® Filter

The right choice for your high quality filtration needs, the MicroStar® Filter’s unique star segment design provides maximum filtration performance and improves water quality. Available as an in-channel or a stand-alone tank-mounted unit, the unique star shaped segments provides 40% more filtration surface than similar size products on the market. The filter segments are available with either stainless steel or PES filter cloth.

As the process water flows from the inside to outside of the MicroStar® Filter drum, solids are captured by the filter media. The rotating drum and backwash cycle is initiated on a pre-determined upstream water level. The reject water is collected in the central hopper and discharged by gravity. Back wash cycles operate only when needed, which results in very low operating cost and little reject water quantity. The MicroStar® Filter remains in service during the cleaning sequence to provide continuous filtration.

With its compact design, the MicroStar® Filter will handle many applications effectively.

  • Tertiary treatment for wastewater plants; TSS reduction, phosphorous removal
  • Filtration of surface and well water; removal of algae, cooling water filtration, drinking water treatment, stormwater treatment
  • Material recovery; fibers, plastics or any other valuable material
  • Industrial applications; fish farms, food industry, paper industry, power plants, steel industry, textile factories

Raptor® Septage Acceptance Plant

Remove debris and inorganic solids from septage tanks, grease traps, sludge, leachate and industrial waste with the fully automated Raptor® Septage Acceptance Plant (SAP). The heart of the SAP is the Raptor® Fine Screen, which compacts and dewaters the captured screenings to a solids content of 40 percent. The screen’s rotating rake teeth fully penetrates the cylindrical screen bars, which prevents plugging and blinding from grease and small debris. This allows for faster unloading times to generate more revenue for your facility.

The Raptor® Acceptance Control System (RACS) is a security access station that can be integrated with the SAP to allow authorized haulers to unload their waste at your facility. Adding the data management and accounting system with the RACS station provides administration capabilities to track and invoice customers.

Aeroductor

The Aeroductor grit chamber effectively removes inorganic grit from the influent flow in a controlled, aerated environment. Air is injected into the grit chamber, circulating the contents and causing lighter organics to remain in suspension while heavier grit is scoured, washed and collected at the bottom of the tank. Settled grit is periodically removed by an airlift pump. The air-grit slurry mixture is lifted to the head box where the air is vented and the liquid/grit mixture is directed to the Grit Classifier for separation and dewatering.

In-Line Grit Collector

Ideal for smaller treatment facilities, the In-Line Grit Collector is an aerated grit chamber. It is an all in one unit consisting of a settling chamber with an air diffuser, grit screw, and an effluent trough. Air maintains circulation in the grit chamber for all flow conditions keeping lighter organic material from settling. The heavier grit particles, which settle to the chamber floor, are removed by an inclined grit screw for disposal.

Raptor® Grit Washer

The Raptor® Grit Washer effectively washes and stirs the grit ensuring only cleaner, dense grit remains. Combining a circular and conical design with natural vortex and gravity forces, the washer provides the highest washing efficiency over a wide range of flow rates.

Influent flow enters the all stainless steel unit tangentially, creating centrifugal forces that allow water and lightweight organics to discharge over an upper weir plate. Grit and heavier materials settle to the lower conical shaped grit zone where they are gently agitated by mixer arms and washed. Organics released during agitation and washing are removed periodically via a blow down valve maximizing grit removal operations.

Grit Classifier

The Grit Classifier is used in conjunction with the Aeroductor or SpiraGrit Vortex Grit Chamber, where the pumped grit is sent to the classifier for further separation and dewatering. The classifier’s screw conveyor transports the settled grit for disposal, while the overflow is sent back to the grit chamber.

Lakeside offers multiple Grit Classifier types which can be incorporated into your grit removal system. Our engineers will help select the right classifier based on your operation.