Direction: An activated sludge system (sketched below) is operating at equilibrium with the following information. Waste water related data: flow rate=500 m³/hour, influent BOD = 150 mg/l, effluent BOD = 10 mg/l. Aeration tank related data: hydraulic retention time = 8 hours, mean-cell-residence time = 240 hours, volume = 4000 m³, mixed liquor suspended solids = 2000 mg/l. Influent Aeration tank Secondary Effluent clarifier Sludge recycle Solids wasted 2. The mass (in kg/day) of solids wasted from the system is

Q: 5. The Pherric, New Mexico, groundwater contains 1.800 mg/L of iron as Fe*. What pH is required to…

A: Given:Groundwater has 1.800 mg/L Fe and desired concentration is 0.30mg/L

Q: A complete mix activated sludge secondary treatment plant has an effluent standard of 30 mg/L SS and…

A: Solution: Given Data: Effluent standard of 30 mg/L SS BOD5=20 mg/L Plant produce an effluent with…

Q: Filtration of wastewater flowing over a surface of land with vegetation and water is a    an…

A: An artificial wetland is a wetland created by man to treat wastewater from industries, rainwater,…

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.