ider the feasibility of treating the wastewater from the town of Nancy (Problem 12.31) in a single-stage trickling-filter plant, as diagrammed in Figure 12.21, using high- density cross-flow media with a specific surface area of 42 ft/ft³. Use the same filter sur- face 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 concen- tration 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 of the cross-flow media recommends a reaction-rate coefficient at 20°C of 0.0030 (gpm/ft2)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the solu- ble effluent BOD and double this value for the estimated effluent BOD

ider the feasibility of treating the wastewater from the town of Nancy (Problem 12.31) in a single-stage trickling-filter plant, as diagrammed in Figure 12.21, using high- density cross-flow media with a specific surface area of 42 ft/ft³. Use the same filter sur- face 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 concen- tration 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 of the cross-flow media recommends a reaction-rate coefficient at 20°C of 0.0030 (gpm/ft2)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the solu- ble effluent BOD and double this value for the estimated effluent BOD

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Question

Consider the feasibility of treating the wastewater from the town of Nancy (Problem
12.31) in a single-stage trickling-filter plant, as diagrammed in Figure 12.21, using high-
density cross-flow media with a specific surface area of 42 ft/ft³. Use the same filter sur-
face 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 concen-
tration 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 of the cross-flow media recommends a reaction-rate coefficient at 20°C of
0.0030 (gpm/ft²)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the solu-
ble effluent BOD and double this value for the estimated effluent BOD.

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2a