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o D.O. should range from about 1.5 at the head of the tank, 2.5 in the middle of the <br /> tank, to about 1.5 at the entrance to the clarifier, and then drop to about 0.5 in <br /> the first tank of the clarifier. <br /> o D.O. should be about 4.5 in the chlorine contact tank. <br /> t <br /> f <br /> a I <br /> I <br /> Measuring Location Markings on Catwalk Railing <br /> i <br /> 1 <br /> .'W� <br /> i <br /> Y <br /> � f <br /> Meassuring DO in the Aeration Tank <br /> Dissolved Oxygen in a wastewater treatment plant is most affected by temperature and <br /> the amount of bacteria present. Temperature is one of the biggest factors that directly <br /> affects dissolved oxygen. <br />