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<br />. <br /> <br />1 - primary sludge pump from primary clarifier to digester <br />(can be final clarifier to digester) . <br />Carter Model 695 Simplex sludge pump <br />6" @ plunger, 0.612 gal/rev. <br />@ 50 rpm, Cap. = 30.6 gpm <br /> <br />1 - sludge recirculation pump ~ 4" ~ <br />Fairbanks-Morse Model 5423K <br />150 gpm, 860 rpm @ 25' <br />3 hp Fairbanks-Morse Motor <br /> <br />. <br /> <br />E. Environment & Natural Hazards: Cold temperatures in the <br />winter have created some ice problems on the trickling <br />filter. <br /> <br />. <br /> <br />IV. PLANT OPERATION <br /> <br />. <br /> <br />A. Process Variables: sludge wasting rate, recirculation rate, <br />chlorination, and by-pass regulation <br /> <br />B. Residuals Handling: Bar screen solids are deposited in an . <br />open trench near the bar screen and are eventually buried. <br /> <br />C. Plant Operation <br /> <br />1. Process or equipment problem history: Ice in the winter . <br />stops the trickling filter distributor. Manual controls <br />regulate the variable speed pumps in the lift station in- <br />stead of the automatic controls. The flow records show <br />3 to 4 sudden surges per day. There is a scum problem <br />in the digester. The operator feels that the sludge re- <br />turn from the final clarifier is too low. The comminutor ., <br />breaks down frequently. <br /> <br />2. Record-keeping practices: A preventive maintenance schedule <br />is used. <br />1 <br />3. Outfall inspection: The discharge is foamy and turbid, but .i <br />no sludge deposits were seen. There was evidence of pre- <br />vious by-passes, but none recently (Oct. 1974). <br /> <br />4. Personnel and personal aspects: Two full-time employees <br />are working at the sewage treatment plant with the water <br />treatment plant operator available for emergency situations. . <br /> <br />40 <br /> <br />. <br />