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Clarifier Scum Baffle <br /> The scum baffle is designed to catch floating materials and stop them from entering the clarifier. <br /> • The operator should skim the material out of the baffle area as needed, which may be <br /> daily in the summer <br /> • Fats, oils, and grease tend to increase during the winter months <br /> Air Injection <br /> Piping i <br /> i <br /> I - <br /> (7 <br /> Skimmer <br /> Scum Baffle <br /> RAS Piping <br /> i <br /> North Hopper of Clarifier <br /> Foam transferred from the aeration tank to the clarifier will naturally accumulate in the scum <br /> baffle area and harden over time. The foam will then begin to break down anaerobically, leading <br /> to dissolved pollutants being dispersed in the clarifier, which will lead to upset conditions. Foam <br /> in the clarifier must be addressed by the operation of the aeration tank, rather than just removing <br /> it from the baffle. <br /> Clarifier Skimmers <br /> The clarifier is designed with two skimmers to prevent paper, plastics, grease, foam, and floating <br /> bacteria from leaving the clarifier and accumulating on the filter. The skimmer operates with the <br /> use of an air lift pump. Air lift pumps have limitations with removing low density materials such <br /> as plastics and grease from the surface of the clarifier. These materials may need to be skimmed <br /> manually. <br /> • Verify that the skimmers are operational. Check the skimmer discharge in the aeration <br /> tank which should appear as clear water and be about% a pipe full at each discharge. <br /> • The height of the skimmer can be adjusted by physically moving the skimmer higher or <br /> lower to increase or decrease the amount of discharge. <br />