A continuous flow through the activated sludge process treats 1500 m3/day flow with a BOD of 250 g/m3. Given parameters are Y=0.6, Maximum sp. substrate utilization rate=2.0 g BOD/g cells-day, decay = 0.1/day and Ks= 4. Make typical assumptions of activated sludge as needed. a) Calculate the mean cell residence time and reactor volume for 99 % BOD removal. b) Repeat these calculations for a system that recycles 50 % of cells in 10 % of the influent flow

Q: What is the hydraulic retention time?  b. What would be concentration decay model along the relative…

A: a) Hydraulic detention timeThe hydraulic detention time (th) is given by th =VQ=3000 m3600m3day=5…

Q: Using the following primary settling tank data, determine the daily sludge production. Operating…

A: As math type is not available, Providing Hand written solution to you,

Q: A container of Atrazine (500 g) is dumped into a river 2.3 km upstream of a municipal water intake…

A: Given, M = 500 gm or 0.5 kg L = 2.3 km or 2300 m  A = 5.7 m2  Q = 8.25 m3/s D = 0.1 m2/s

Q: wet sludge contains 3% solid by weight is pumped to a filter belt press at the rate of…

A: wet sludge contains 3% solidFilter rate = 170,000 lb/dayTo calculate the amount of nitrogen (lb/day)…

Q: A stream containing no biochemical O2 demand (obviously a hypothetical situation) has a DO of 5.00…

A: Given  DO = 5.00mg/l Flow Rate =  8.7m3/s Temperature = 15oC Avg Velocity =  0.174 m/s Avg Depth =…

Q: What do the Daily Construction Reports include?

A: Daily Construction Report is a document that records on a project the everyday operations and is…

Q: There is a sewage sludge with volume containing a certain moisture content p, (percent). What will…

A:

Q: Hydraulic conductivity K= 100 ft/day, Aquifer thickness B = 50ft, Hydraulic gradient J = 0.001 Plume…

A: Co-efficient of Permeability , K=100ft/d Aquifer Thickness , B=50 ft Hydraulic Gradient , j=0.001

Q: Using Rihet equation, estimate aeration tank Volume (V) based on the following conditions:…

A: GIVEN- Saturation constant (Ks) = 80 mg/L microbial decay coefficient (kd) =0.15/d maximum specific…

Q: A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s.…

A: Discharge, Net pressure, Water flux rate coefficient,

Q: A secondary treatment using a mixed water activated sludge system, have the flow rate of…

A: simple activated sludge process diagram and their simple formula

Q: A bio-tower composed of a modular plastic medium of 6 m is used as secondary treatment component in…

A: A bio-tower composed of a modular plastic medium of 6 m is used as a secondary treatment component…

Q: 9. Improperly stored industrial waste results in the discharge of chlorobenzene (C6H5CI) into…

A: The hydraulic gradient (i) is the change in head over the change in distance. In this case, the head…

Q: (a) What is the maximum contaminant concentration that is expected at a location 2 km downstream of…

A: a) - Discharge(Q) = 2m3/s B= 5m    D= 1m  Velocity = QB*D V= 25*1 = 0.4m/s Time taken to travel…

Q: The waste flow 18000m³/day is treated by activated sludge process to reduce 97.5% of influent BOD5…

A: Step 1: Step 2: Step 3: Step 4:

Q: Q2) A waste of 600 m/hr flow rate with an ultimate BOD0 = 140 mg/l is to be treated in an activated…

A: Q = 600 m3hr y = .65 kd = .055 /day So = 140 mgl Se = 20 mgl θc= 10 days

Q: The saturation DO concentration of a stream is 9.1 mg/L. At a sewage outfall, the DO of the stream…

A:

Q: A WWTP with activated sludge secondary treatment receives 0.290 m / s of flow from the primary…

A: Answer  We are given flow rate Qo = 0.290 m3/s  microbes concentration the aeration basin X = 2500…

Q: Microbial growth in an activated sludge system can be described by the Monod model. If the maximum…

A: µ=specific growth rate = .6 day-1   µmax=maximum value of μ = 1.2 day-1   KS=saturation constant =…

Q: A complete mixed activated sludge process (CMAS) is to be designed to treat 5MGD of primary effluent…

A: To determine the minimum MCRT, we can use the following equation: MCRTmin = 1 / kd MCRTmin = 1 /…

Q: a) An activated sludge plant with recycle is evaluating its secondary clarification system. Settling…

A: Activated sludge process:  The process of removeal of suspended growth process for the solid waste…

Q: A plug flow and a CFSTR biological reactor are both operating with an influent substrate…

A: Answer We need to calculate Volume of both the reactor first Volume of plug flow reactor is given by…

Q: A complete-mixed activated sludge process is to be designed to treat 5.0 MGD of primary effluent…

A: Flow rate= 5 MGD  Primary effluent BOD5 = 180 mg/ L

Q: A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m³/s.…

A: Discharge, Net pressure, Water flux rate coefficient,

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.