CA Wastewater Grade 3 sample questions

30 days is normally required for anaerobic digestion - T A 5 Hp pump is being used to pump 3 MGD of wastewater 8 feet. What is the pump efficiency? - 86% A 50 acre pond receives a flow of 4 MGD. How many inches of wastewater is added to the pond each week? - 20 inches A belt press is ran 8 hours each day and receives a flow of 145 GPM with a solids content of 15,000 mg/L. An anionic polymer is being added which allows for a 95% capture of the solids. The belt press cake weights 63.4 lbs/cubic feet which is 19 % solids. How many 20 cubic yard trailers should be ordered each week to hall away the sludge cake. - 9 A complete-mix activated sludge basin is normally square allowing complete MLSS mixing. - T A high hydrogen sulfide gas concentration is required before your sense of smell will be dulled. - F A wastewater plant has a flow of 8 MGD with a chlorine demand of 7 mg/L and a residual of 3 mg/L . Seven percent sodium hypochlorite with a specific gravity of 1.07 is being used for disinfection. What should the sodium hypochlorite pump be set at? - 0.74 GPM Advantage(s) of the COD over the BOD test is A. it only takes a few hours to complete. B. indicates more accurately that the waste can be treated in the activated sludge process. C. takes place at a much lower temperature than the BOD test. D. No hazardous waste is generated during the test. E. All the above. - A Alkalinity is the key control for an activated sludge basin. - F An activated sludge plant wit