Clarifier Sludge Removal & Effluent Launders
Settled sludge, as well as clearwater, must be continuously removed from the clarifier tank. For sludge removal, different systems are available — sludge agitators in combination with an inclined tank bottom, flushing mechanisms, and rotary or chain scraper systems.
Depending on the individual customer’s situation, AET offers support for selecting the right sludge removal system.
Generally, effluent launders are designed as perforated pipes or rectangular channels with an overflow weir. The design must go hand in hand with the design of the lamella plate settlers. An incorrect design can result in a hydraulic overload of the effluent launders or in short circuit flows through the lamellas. Moreover, both of these issues can significantly affect the clarifier system’s performance. One important factor for avoiding these risks is correct alignment of the effluent launders to the inclined water level of the clarifier tank. This can be solved by using adjustable weirs.
AET provides consulting and product systems for sludge removal and effluent launders in several variations along with a range of materials such as stainless steel, PVC, or RFP. Please contact us today for more information.
Articles & Literature
One of the most important treatment steps in wastewater and drinking water plants is sludge removal by sedimentation. Sludge in clarifiers can either be settled down to the bottom of the basin or float on the water surface (scum). In most aeration basins the sludge is “activated” meaning it contains live bacteria which are required for biological processes within the treatment plant.