Q1) Stabilization ponds receive a wastewater flow of 350 m³/d with a BOD of 320 mg/l. If the BOD loading is 2.8 g/m²/d calculate the total surface area and storage available between the 0.6 m and 1.5 m depuis assuming a waier loss of 0.27 mm/d during the winter months. winter ALL

The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation levelat that point is 9 mg/L. Given a deoxygenation rate coefficient of 0.28 / day and a rearationrate coefficient of 0.8/day. Determine a. The critical distance downstream assuming the sewage outfall is the only source ofBOD for the river and that it flows at 50 miles / day. b. the minimum DO c. thet fraction of the BOD that would have to be removed by a waste water treatmentplant to ensure > 5 mg/L everywhere downriver.

A circular primary clarifier processes 5005 cubic meters of municipal wastewater every day. The overflow rate is 35m³/m²d. The diameter of the clarifier shall be

Determine the characteristics of a unit composed of 2 desilting channels treating a peak wastewater flow of 1500 L7s. A surface load of 40 m/h is assumed. The effective head or depth "P" is set at 1.5 m. Calculate: 1. Area of each channel 2. 2. Effective volume of each desanding channel 3. HRT 4. Cross-sectional area of each desanding channel 5. 5. Width of each channel.