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Y. <br /> Stalked Ciliated Protozoa <br /> Attach to solids by means of a projecting stem. <br /> Medium in size (50-100 microns) <br /> Have cilia around opening for food intake. <br /> Suctoria <br /> Often mistaken for ciliated protozoa. Can be readily identified by hollow <br /> tubes projecting from the body of the microorganism which are used for <br /> feeding. Has a projecting stem for attachment to any solid particles. <br /> Medium in size (50-100 microns) <br /> Rotifers <br /> Have flexible bodies with cilia present around the mouth for food <br /> intake and a means of movement. Some may have forked tails <br /> that allow them to remain attached to solid particles while feeding. <br /> Large in size (200-300 microns) <br /> Typical Lab Results for an Activated Sludge Plant <br /> Typical results of lab test for an conventional activated sludge plant are <br /> provided to assist in the evaluation of lab results and plant performance. Remember <br /> that every plant is different and is influenced by different conditions. <br /> Test Location Common Range <br /> COD Influent 300 - 700 mg/I <br /> Primary Effluent 200 - 400 mg1I <br /> Final Effluent 30 - 70 mg/I <br /> BOD Influent 150 - 400 mg/I <br /> Primary Effluent. 100 - 280 mg/I <br /> Final Effluent. 10 - 20 mg/I <br /> SUSPENDED Influent 150 - 400 mg1I <br /> SOLIDS Primary Effluent 60 - 160 mg/I <br /> Mixed Liquor 1000 - 4500 mg/I <br /> Return Sludge 2000 - 10,000 mg/I <br /> Final Effluent. 10 - 20 mg/I <br /> DISSOLVED Mixed Liquor 2 - 4 mg/I <br /> OXYGEN Final Effluent. (Outfall) 2 - 6 mg/l <br /> CLARITY Final Effluent 3 - 8 ft <br /> �Secchi Disc) <br /> PH Influent 6.8 - 8.0 <br /> Effluent 7.0 - 8.5 <br /> - 5 - pcs.,,'o&m-obs1—v&test 1-5 <br />