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Bacteria <br /> The bacteria in the aeration tank are commonly referred to as aerobic bacteria, because they <br /> require oxygen to survive. The bacteria and other microorganisms that feed on the waste <br /> pollutants tend to flocculate or "stick together" to form a heavier biological mass that will settle <br /> and separate from the water in the clarifier. <br /> There are two structural types of bacteria which dominate in the aeration tank. The first type is <br /> a bacteria which grows together and resembles a cluster of grapes. These are referred to as <br />