Chapter review questions

4.1 The depth of water in the grit channel is 36 in. What is the depth in feet?

4.2 The operator withdraws 5269 gal of solids from the digester. How many pounds of solids have been removed?

4.3 Sludge added to the digester causes a 1996-ft3 change in the volume of sludge in the digester. How many gallons of sludge have been added?

4.4 The plant effluent contains 35 mg/L solids. The effluent flow rate is 3.69 MGD. How many pounds per day of solids are discharged?

4.5 Plant effluent contains 26 mg/L of BODs. The effluent flow rate is 7.25 MGD. How many kilograms per day of BOD5 are being discharged?

4.6 The operator wishes to remove 3540 lb/day of solids from the activated sludge process. The waste activated sludge concentration is 3524 mg/L. What is the required flow rate in million gallons per day?

4.7 The plant influent includes an industrial flow that contains 235 mg/L BOD. The industrial flow is 0.70 MGD. What is the population equivalent for the industrial contribution in people per day?

4.8 Determine the per capita characteristics of BOD and suspended solids (SS) if garbage grinders are installed in a community. Assume that the average per capita flow is 110 gpd and that the typical average per capita contributions for domestic wastewater with ground kitchen waste are BOD 0.21 lb/capita/day; SS is 0.28 lb/capita/day.

4.9 The label of hypochlorite solution states that the specific gravity of the solution is 1.1545. What is the weight of a gallon of the hypochlorite solution?


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