1. Calculate the volume of a completely mixed reactor needed (in m3)lto treat a flow rate of 3 MG...
3. Determine the aeration tank volume (mgd), excess biomass in the waste sludge (kg/d), and the BOD f a completely mixed activated-sludge process by assuming the following: k 4.0 day r-0.55 lb vSS/1b BOD, K, 80 mg/l, ks-0.05 day', wastewater flow rate 2.5 mgd, soluble effluent BOD- 15 mgl, soluble influent BOD - 170 mgl, and MLVSS-2200 mg/l, and mean cell residence time -6 days. (15 pts)
3. Determine the aeration tank volume (mgd), excess biomass in the waste sludge...
A wastewater flow of 18,000 m3/day is to be treated in a completely mixed activated sludge system at a concentration of 3000 mg/L MLSS (mixed liquor suspended solids). The secondary clarifier is designed to thicken the sludge to 12,000 mg/L. Assuming a growth yield coefficient of 0.5 Kg/Kg, an influent BOD of 100 mg/L with a residence time of 8 days, determine the following: a) The volume of the reactor b) The mass of the solids and the wet volume...
A completely mixed activated sludge plant is designed to treat
10,000 m3/d of an industrial wastewater. The wastewater has a BOD5
of 1200 mg/L. Pilot plant data indicates that a reactor volume of
6090 m3 with an MLSS concentration of 5000 mg/L should produce 83%
BOD5 removal. The value for Y is determined to be 0.7 kg/kg and the
value of kd is found to be 0.03 dā1. Under ow solids concentra-
tion is 12,000 mg/L. The ow diagram is...
(30 points) A completely mixed activated sludge system comprised of an aerated reactor and a secondary clarifier with sludge return is going to treat 15,000 m/d of industrial wastewater. The primary effluent going to the reactor has a BODs of 1,100 mg/L that must be reduced to 150 mg/L prior to discharge to a municipal sewer. The pilot study was conducted and generated the following results: 3. Mean cell residence time- 5 day, MLSS concentration in the reactor 7.200 mg/L...
completely mixed activated-sludge plant is to treat 10 000 m3/d ofindustrial wastewater. The wastewater has a BOD5 of 1200 mg/L that must be reduced to 200 mg/L prior to discharge to a municipal sewer. Pilot-plant analysis indicates that a mean cell-residence time of 5 d maintaining MLSS concentration of 5000 mg/L produces the desired results. The vaue for Y is determined to be 0.7 kg/kg and the value for kd is found to be 0.03 d-1Determinea) The volume of the...
Situation (note: Problem 2 is not linked with Problem 1): Assuming the design flow rate of raw wastewater to be treated is 20 MGD in the design year, the dissolved BODs is 380 mg/L, and SS is 360 mg/L. The wastewater generated by the sludge treatment process is about 4 MGD with the dissolved BODs being 1800 mg/L, and SS being 1200 mg/L, and will be returned to the wet well in the pumping station at the beginning of the...
\The flow rate to treat is 5.6 MGD and the BOD concentration is 150 mg/L. The design solids concentration (X) at steady-state is 2,000 mg/L. The design MCRT is 7 days. The kinetic coefficients are as follows: k = 2 g BOD/g cells*day; Ks = 25 mg BOD/L; kd = 0.06 1/day; Y = 0.5 g cells/g BOD. The influent ammonia concentration is 40 mg/L and nitrification is needed. It takes 1400 ft3 of air per pound of BOD. Use...
A lagoon with volume 1,000 m3 has been receiving a steady flow of a nonconservative pollutant with reaction rate of .20/day at a rate of 100 m3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 100 mg/L. Assume completely mixed conditions. If the input waste concentration suddenly decreased to 10mg/L, what would the concentration in the effluent be 10 days later?
You are designing a sewage lagoon to accommodate an input flow of 0.1 m3/min. At steady-state, the effluent (also at 0.1 m3/min) from the lagoon must not exceed a BOD of 10 mg/L. Assume the lagoon is well mixed, that there are no additional inputs to the lagoon and that the BOD degrades with a reaction rate constant equal to 0.1 day-1. What is the volume of the lagoon needed to achieve the effluent BOD goal if the influent BOD...
4. Rural facultative pond with a winter flow of 6000 m3/d where the influent has a BOD concentration of 90 g/m^3. The reaction rate is given by Kc(T)=0.3x1.135^(T-20). Assuming completely mixed, use Marias & Shaw equation to determine the pond volume to produce an effluent of 15 mg/l/