- 23 A Complete Mixed Activated Sludge System With Recycle Is Used To Treat Flow From A Roughing Filter 4 2 Mgd The In 1 (23.8 KiB) Viewed 29 times
23. A complete mixed activated sludge system with recycle is used to treat flow from a roughing filter (4.2 MGD). The influent BODs into the activated sludge system is 97 mg/L and the required effluent is 7 mg/L. The MLSS concentration is 2800 mg/L and is 80% volatile. The HRT of the system is 1.7 hours and a recycle ratio of 0.5 is used. The temperature in the winter of the activated sludge system is 16 C and controls the design. Find the BODs Loading on the activated sludge system to the nearest tenth (lb/d-1000 ft3).