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A small community wishes to construct an activated sludge wastewater treatment plant to treat their wastewater. the wastewater from the community has an average flow rate of 0.0022 m^3/s (190 m^3/day) and an influent substrate concentration of 250 mg/L as COD and all of them are essentially soluble. for sizing the syst em, the mean cell residence time is selected to be 5 days. the reactoer kinetic constants are u max= 2.4 d^-1 (1/day), Ks=75 mg/L as COD, Y=0.4 VSS/g COD and Kd=0.096 d^-1(1/day)
the design engineer propsed a fully mixed tank with a volume of 25 m^3. you have asked to evaluate this design and the follow parameters have to be calculated.
1. what is the hydraulic residence time of this reactor?
2. what is the COD removal efficiency of this system?
3. what is the biomass concentration in aeration tank?
4. what is the F/M ratio?
5. what is the sludge production rate?
Hint: K= u max/ Y ( maximum substrate utilization rate)
A river discharges at a rate of 500 cfs into a lake. The water is drawn from the lake at a rate of 200 cfs. The surface area of the lake is 60 acres (1 acre = 43, 560 ft2). What is the rate of water rise in the lake in one day
The total dissolved inorganic carbon (TIC) of a sample of groundwater is 8.33 mM. The temperature of the aquifer is 15C, the pH is 7.5, and the ionic strength is 0.05 M. What is the H2CO3, HCO3-, CO3 2-, and the partial pressure of CO2
A long throated flume is built in a rectangular 1 m widechannel having a throat width of 0.5m. The upstream head is 0.6 m.Assume a Cd of 1.0.
in a hydrometer test , the results are as follows:Gs =2.60 , temperature of water=24c ,and R=43at 60 min after the start of sedimentation . what is the diameter , D, of the smallest -size particles
Plot the concentration of tracer at the outlet of the each of the two reactors during the first 24 hours of the tracer study. (Hint: You may need to use mass balances to obtain equations that predict the concentration of tracer as a function of time)
Body A and body B are connected by an inextensible cord. If both bodies are released simultaneously from rest, what distance do they move in 3 sec and what is the tension in the cord. The weight of A is 50 lb and the weight of B is 10 lb.
For the following waste and river characteristics just upstream from the outfall, find the minimum downstream DO that could be expected
Tacoma Narrows Bridge. Conduct either a qualitive and quantitive risk assessment on this project. Identify the risk factors that you consider most important for the suspension bridge construction. How would you assess the riskiness of this project..
At a certain altitude and time, a rocket's acceleration is 2.5 g. One gravity (g) is equivalent to 32.2 ft/s^2. What is the rocket's acceleration in meters per square second
A 12in diameter water main in your city has become very rough due to rust and corrosion, it has been suggested that the flowrate through the this pipe can be increased by inserting a smooth plastic liner into the pipe.
A floor is to be supported on hardwood timber joists that are spaced at 0.5m centres and span 5.0m. The joists support flooring 20mm thick and an applied live load of 2kN/m2 Design a typical joint 50mm wide
Helium enters an adiabatic steady-state nozzle at 200kPa and 124 degrees Celsius and 10m/s. At the nozzle exit the temperature of the helium is 100 degrees Celsius and the pressure = 150 kPa.
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