Solved In the activated sludge process, we “activate” the - Chegg
In the activated sludge process, we “activate” the sludge by accumulating a high concentration of biomass through sludge settling and recycle. You analyze the biomass in an activated sludge process and find that its total concentration is 3,000 mg/l as volatile suspended solids which is the same as organic dry weight.
Solved NRC equation for activated sludge. Given: Q = 4 x 105
NRC equation for activated sludge. Given: Q = 4 x 105 gal/day, influent soluble BOD = 134 mg/l, and a tank volume of 14,000 ft3 . a. Use the NRC model for activated sludge. When the solids recycle maintains the MLSS at 2000 mg/l, what is estimate of the effluent BOD concentration? b. Would this meet an NPDES limit of 15 mg/l BOD? c.
Solved A5). Mass Balance Equations Around An Activated - Chegg
Given activated sludge systems (a) and (b) shown below, where the activated sludge basin is a CSTR, and the sedimentation tank is for settling biosolids. Assume there is no generation or decay in the sedimentation tank and give that: substrate …
Solved Activated sludge is treated in a 1400 ft3 aeration - Chegg
Activated sludge is treated in a 1400 ft3 aeration basin. The biomass concentration is 1800 mg/L. The waste sludge flows at a rate of 140 ft/day, and the waste sludge suspended solids concentration is 600 mg/L. The effluent flows at a rate of 240 ft/day, and the effluent suspended solids concentration is 1900 mg/L.
Solved Waste activated sludge can be described as a - Chegg
Waste activated sludge can be described as a Newtonian fluid with a kinematic viscosity of 20 x 10^-5 ft^2/sec. At the same temperature, the kinematic viscosity, v, of water is 10^-5 ft^2/sec. The relative roughness of the piping system is 0.001.
Solved Mass Balance: Activated Sludge CSTR clarifier - Chegg
(20 pts) The flow diagram at the right depicts a conventional CSTR activated sludge process that is being used by your utility. Some potentially useful equations can be found in the back pages of the exam You need to design an activated sludge unit process to treat 30 MGD of flow with soluble BOD influent of 320 mg/L coming from the primary ...
Solved 4. An activated sludge reactor produces the wasted - Chegg
Question: 4. An activated sludge reactor produces the wasted sludge with 1% of the solid content. What is the mass concentration of dry solid (mg/L) assuming the sludge has a density close to water? 5. Estimate the pH of water that contains the total alkalinity of 20 mg/L as CaCO3. Assume [CO, F[H_CO,] at equilibrium pKal=6.35 and pKa2=10.33. 6.
Solved 1. A municipal WW activated sludge facility has the - Chegg
A municipal WW activated sludge facility has the following characteristics: Flow = 7.2 million liters per day Influent BOD5 = 200 mg/L Aeration basin volume = 3,000 m3 Two circular clarifiers (each with diameter = 20 m and depth = 4.0 m) Return activated sludge flow rate = 3.5 million L/day per clarifier MLVSS concentration = 3,500 mg/L
Solved An activated sludge plant cost $75 million when it - Chegg
An activated sludge plant cost $75 million when it was built in 1995. The detailed cost breakdown is given below. Determine a weighted index for the construction of a similar plant in 2009. Cost Element Percent Index (1995) Index
Solved A municipal WW activated sludge facility has the - Chegg
A municipal WW activated sludge facility has the following characteristics: Flow as 14.0 million liters per day Influent BOD5 = 200 mg/L Aeration basin volume = 3,000 m^3 Two circular clarifiers (each with diameter = 20 m and depth = 4.0 m) Return activated sludge flow rate = 3.5 million L/day per clarifier MLVSS concentration = 3,500 mg/L Effluent VSS is negligible Sludge VSS concentration ...