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-__ _ Clarifier Weirs <br /> I <br /> f <br /> Clarifier Exit <br /> Clarifier Weir <br /> Weirs should be level when installed, however, algae growth on sections of the weir can cause <br /> portions of the weir to be obstructed, which leads to higher velocities in other areas.The solution <br /> is: <br /> • Keep algae growth from blocking sections of the weir by using a pool brush. <br /> Higher Velocity <br /> himi <br /> i <br /> Clarifier Weir <br /> 3.6.3f Management of Waste Activated Sludge <br /> Solids wasting is the pumping of settled sludge from the clarifier to the solids handling tank for <br /> final disposal. This is called Waste Activated Sludge (WAS). If sludge is not wasted, the clarifier <br /> eventually fills up with solids, which will overtime, overflow the weir in the clarifier, and end up <br /> in the filter. Solids in the filter are to be avoided, as it can lead to a plugged filter, excess <br /> backwashes, and a cascading effect that can result in permit violations. <br />