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microscopic examination has the ability to recognize the five major types of <br /> microorganisms. Set the microscope at 200x magnification when performing this test. <br /> An evaluation of operating conditions, based upon the presence of types of animal life <br /> should not be based on the absolute number of certain types; but rather on which form <br /> is predominate. The following guide can be sued to evaluate plant performance: <br /> (a) If flagellated protozoa are predominate, the contents are relatively high in organic <br /> content and not stabilized. <br /> (b) If free-swimming protozoa are predominating, a moderately low organic level <br /> exists, 50/100 mg/1 5-day B.O.D. <br /> (c) If stalked ciliated protozoa are predominate, a low organic level exists, not <br /> stabilized, 10-20 mg/ 1 5-day B.O.D. <br /> (d) If rotifers predominate, a very low organic condition exists, not stabilized, 2-5 <br /> mg/1 5-day B.O.D. <br /> (e) Suctoria themselves do not indicated stabilization since they exist on other <br /> protozoa rather than on unstable organic matter or other bacteria. The suctoria <br /> will be found in greatest numbers when free swimming ciliated protozoa are also <br /> greatest in number. <br /> The protozoa can be used to indicate shock loads since they are very sensitive to toxic <br /> materials, and consequently will die before the bacteria are affected. Routine <br /> observation of the protozoa can indicate a trouble that may be serious enough; but if <br /> caught in time will prevent the bacteria from dying. <br /> The protozoa and the other animals are strict aerobes, and <br /> hence indicate that ample oxygen is present. if an {, <br /> anaerobic condition exists, the microscopic animals can - <br /> exist for a few hours, but a prolonged anaerobic condition <br /> will prove fatal. <br /> A low pH condition will also prove fatal in a very short period of <br /> time to microscopic animals. <br /> The following are the typical microorganisms found in activated <br /> sludge plant: -` <br /> Flagellated Protozoa <br /> Movement is undulating and slow. Smaller in size (10-100 microns) <br /> Protozoa with long whip-like organs of mobility (flagella). <br /> Ciliated Protozoa <br /> Free swimming Protozoa moving very fast in a darting like manner. <br /> Medium to large in size (50-200 microns). Have tiny hair-like cilia over the cell. <br /> -4 - pcs;'o&, i-observ&test l-' <br />