3) A group of neighboring municipalities decide to combine their waste streams and treat them all...
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3) A group of neighboring municipalities decide to combine their waste streams and treat them all at one existing wastewater treatment plant, initiating a need to upgrade the plant's treatment capacity. The addition of the outside waste streams increases the UBOD loading on the plant to 45,000 kg/day which corresponds to a concentration of 238 g/m with a flow rate of 202,000 m/d. The wastewater discharged from the wastewater treatment plant is predicted to be at a temperature of 23C with no dissolved oxygen. The river upstream of the treatment plant has a flowrate of 5.5 m/s, an average temperature of 16.5C, no UBOD and a dissolved oxygen concentration equal to the saturation concentration. After mixing with the wastewater the velocity and average depth of the river are estimated to be 0.38 m/s and 2.7 m, respectively. To avoid interfering with downstream fish habitat, a minimum DO of 5 mg 02/L must be attained at 43 km downstream from the wastewater plant. The carbonaceous reaction constant for the mixed river and wastewater is 0.14 1/d at 20C. Determine the following: a) the deoxygenation (ka) and reaeration (kr) constants at 20C and at the mixed b) temperature. the effluent UBOD (Lw) required to have a minimum DO concentration of 5 mg O/L or above. c) the degree of treatment the wastewater treatment plant is required to implement to meet the required effluent UBOD. Is primary treatment sufficient? 3) A group of neighboring municipalities decide to combine their waste streams and treat them all at one existing wastewater treatment plant, initiating a need to upgrade the plant's treatment capacity. The addition of the outside waste streams increases the UBOD loading on the plant to 45,000 kg/day which corresponds to a concentration of 238 g/m with a flow rate of 202,000 m/d. The wastewater discharged from the wastewater treatment plant is predicted to be at a temperature of 23C with no dissolved oxygen. The river upstream of the treatment plant has a flowrate of 5.5 m/s, an average temperature of 16.5C, no UBOD and a dissolved oxygen concentration equal to the saturation concentration. After mixing with the wastewater the velocity and average depth of the river are estimated to be 0.38 m/s and 2.7 m, respectively. To avoid interfering with downstream fish habitat, a minimum DO of 5 mg 02/L must be attained at 43 km downstream from the wastewater plant. The carbonaceous reaction constant for the mixed river and wastewater is 0.14 1/d at 20C. Determine the following: a) the deoxygenation (ka) and reaeration (kr) constants at 20C and at the mixed b) temperature. the effluent UBOD (Lw) required to have a minimum DO concentration of 5 mg O/L or above. c) the degree of treatment the wastewater treatment plant is required to implement to meet the required effluent UBOD. Is primary treatment sufficient?
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To solve this problem well need to use equations for deoxygenation and reaeration along with the oxygen sag equation to determine the effluent UBOD an... View the full answer
Related Book For
International Marketing And Export Management
ISBN: 9781292016924
8th Edition
Authors: Gerald Albaum , Alexander Josiassen , Edwin Duerr
Posted Date:
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