Consider the feasibility of treating the wastewater from the town of Nancy (Problem in a single stage trickling-filter plant, as diagrammed in Figure 12.21, using lugh- density cross-flow media with a specific surface area of 42 ft2/ft3. Use the same filter surface area as calculated for stone-media filtration in Problem 12.31 (A = 4600 ft2) and a recirculation ratio of 0.5.The design wastewater temperature is 15°C. As determined from laboratory testing, the soluble (filtered) BOD of the primary effluent is 100 mg/l or less, compared to the unsettled unfiltered BOD of 160 mg/l. The soluble effluent BOD concentration of trickling-filter plants treating similar wastewaters is approximately 50% of the unfiltered BOD concentration. From pilot-plant studies and full-scale experience, the manufacturer ol the cross-flow media recommends a reaction-rate coefficient at 20°C of 0.0030 (gpm/fl2)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the soluble effluent BOD and double this value for the estimated effluent BOD.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.