Completely Mixed Reactor
completely mixed activated-sludge plant is to treat 10 000 m3/d of
industrial 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-1
Determine
a) The volume of the reactor
b) The mass and the volume of solids wasted each day
c) The sludge recirculation ratio
Homework Answers
(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. Th...
(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...
A completely mixed activated sludge plant is designed to treat 10,000 m3/d of an industrial wastewater....
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 d–1. Under ow solids concentra-
tion is 12,000 mg/L. The ow diagram is...
A wastewater flow of 18,000 m3/day is to be treated in a completely mixed activated 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...
Completely Mixed Reactor
An oxidation-ditch activated-sludge system receives 17 500 m3/d ofmunicipal wastewater. The BOD of the wastewater is 210 mg/L and no primary treatment is provided. The oxidation-ditch is 3 m deep, 7 m wide and 400 m long. The reactor operated at 1800 mg/L MLSS and the biological constants Y= 0.5 kg/kg and kd = 0.05 d-1Determine the mean cell-resident time for 90 percent BOD removal.
Question 1 The town of Lawrence has been directed to upgrade its primary WWTP to a...
Question 1 The town of Lawrence has been directed to upgrade its primary WWTP to a secondary plant that can meet an effluent standard of 11 mg/L BODS. They have selected a completely mixed activated sludge system with an aeration tank (in the secondary plant) that can produce an effluent with 2,000 mg MLSS/L. a) Estimate the required volume of the aeration tank needed in the secondary plant The following data are available from the existing primary plant. Existing primary...
Use the following data to size (volume in gallons) an activated sludge reactor basin (CFSTR with...
Use the following data to size (volume in gallons) an activated sludge reactor basin (CFSTR with recycle and Monod) MLSS = 3500 mg/l MLVSS = 80% Yield Coeffiecient = 0.6 MLVSS BOD5 influent to the activated sludge basin = 230 mg/l BOD5 effluent to the activated sludge basin = 50 mg/l MCRT is 6 days Endogenous decay coefficient is 0.06d^-1 flow rate = 7 MGD
2. A completely mixed activated sludge process is designed to treat 20,000 m/d of domestic wastew...
2. A completely mixed activated sludge process is designed to treat 20,000 m/d of domestic wastewater having a BODs concentration of 250 mg/L following primary treatment. The NPDES permit requirement for effluent BODs and TSS is 20 mg/L for each. The biokinetic parameters have beern established as: yield 0.6, k 5/d, K-60 mg/L, and kd 0.06/d. The MLVSS concentration in the aeration tank is to be maintained at 3000 mg/L and the ratio of VSS/TSS is 0.75. Assume that the...
Introduction to environmental Engineering. C David Cooper, Chapter 6 Homework 6.14 For municipal wastewater that receives...
Introduction to environmental Engineering. C David Cooper, Chapter 6 Homework 6.14 For municipal wastewater that receives treatment with the activated sludge process, plot the effluent BOD5 as a function of solids residence time using values of SRT that range from 1 to 20 days. The influent BOD5 concentration is 220 mg/L. Assume the following wastewater characteristics: Variable order kinetics k = 5 mg BOD5/mg VSS-day, Ks = 60 mg BOD5/L, Ymax = 0.6 mg VSS/mg BOD5, Ke = 0.06 day^-1....
A complete-mix activated sludge system is used to treat municipal wastewater after primary sedime...
A complete-mix activated sludge system is used to treat municipal wastewater after primary sedimentation at 20 °C with MLVSS concentration of 2000 g/m3. The discharge standard for soluble BOD, concentration in the effluent is 0.5 g/m. The characteristics of the primary influent are: flow Q -2000 m'/d, soluble BOD -200 g/m3, Using these data and the kinetic coefficients in following, determine 1. Theoretical solids retention time (SRT) in unit of days 2. Pk vss in unit of kg VSS/d 3....
Plug-Flow reactor
A Tapered aeration-system is used to treat 12,500 m3/d of municipal wastewater. The wastewater has received primary treatment and has a BOD 5 of 140 mg/l and a suspended solids of 125 mg/l. The system is to be operated in the following way: (a) Soluble BOD 5 in effluent 5 mg/l (b) Average solids concentration in the reactor= 2000 mg/l (c) Mean cell- retention time= 10 d. The biological constants have been determined by pilot-plant analysis and are: Y= 0.55 Kg biomass/ Kg BOD utilized...
(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...
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 d–1. Under ow solids concentra-
tion is 12,000 mg/L. The ow diagram is...
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...
Question 1 The town of Lawrence has been directed to upgrade its primary WWTP to a secondary plant that can meet an effluent standard of 11 mg/L BODS. They have selected a completely mixed activated sludge system with an aeration tank (in the secondary plant) that can produce an effluent with 2,000 mg MLSS/L. a) Estimate the required volume of the aeration tank needed in the secondary plant The following data are available from the existing primary plant. Existing primary...
2. A completely mixed activated sludge process is designed to treat 20,000 m/d of domestic wastewater having a BODs concentration of 250 mg/L following primary treatment. The NPDES permit requirement for effluent BODs and TSS is 20 mg/L for each. The biokinetic parameters have beern established as: yield 0.6, k 5/d, K-60 mg/L, and kd 0.06/d. The MLVSS concentration in the aeration tank is to be maintained at 3000 mg/L and the ratio of VSS/TSS is 0.75. Assume that the...
A complete-mix activated sludge system is used to treat municipal wastewater after primary sedimentation at 20 °C with MLVSS concentration of 2000 g/m3. The discharge standard for soluble BOD, concentration in the effluent is 0.5 g/m. The characteristics of the primary influent are: flow Q -2000 m'/d, soluble BOD -200 g/m3, Using these data and the kinetic coefficients in following, determine 1. Theoretical solids retention time (SRT) in unit of days 2. Pk vss in unit of kg VSS/d 3....
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