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A conventional active-sludge system treats 11,000 m3/day of wastewater with a BOD of 180 mg/I in an aeration tank with a volume of 3400 m3. The operating conditions are an effluent suspended solids of 20 mg/1, an MLSS concentration of 2500 mg/1 and an activated sludge wasting rate of 160 m3/day containing 8000 mg/1.
a. Calculate the aeration period (7.4 hr)
b. Calculate the BOD loading (36.3 Ib BOD/ 1000 cf-day)
c. Calculate the F/M loading (0.23)
d. Calculate the sludge age (5.7 days)
e. Calculate Qr (4767 m^3/day)
Transportation network, A power generator at a dam can send 300 megawatts to substation 1, can send 200 megawatts to substation 2, and can send 250 megawatts to substation 2
The volume of the bend is 0.1 m3. The steel of the bend material weighs 51 kg. Neglecting friction or other losses in the pipe, what is the tension force in the bolts holding the bend in place
a hydraulic jump is to be formed in a trapezoidal channel with a base width of 20ft and a side slope of 2:1. The upstream depth is 1.25ft and Q=1000 cfs. Find the downstream depth and the head loss in the jump.
Testing has shown that at a local race track (0.25 in length) racecars have a maximum side friction factor of 0.08. The smallest turn radius on the oval track is 150 feet and has a banking of 20 degrees.
A person of dubious technical ability tells you that two of the direction angles for a particular vector are 30 and 40 degrees. If these direction angles are feasible, then determine the possible values for the remaning direction angle.
A 0.3-m diameter pipeline terminates in a nozzle of outlet diameter = 0.15 m. When water flows through this pipe at a rate of 0.25 m3/s, the force required to hold the pipe (N) is most nearly.
Five $1,000 bonds having a bond rate of 8% per year payable quarterly are pur chased for $4,940 and kept for 6 years, at which time they are sold. Determine the selling price that yields a 6% effective annual return on the investment.
Describe in outline the main markets, activities and services provided by the construction and built environment sector.
determine the constants sigma0 and k in the Hall petch equation of 70-30 brass sample.
A new after-school delinquency prevention program is being established. The Program Director calls you up on the telephone and asks your advice on how to design a good program. What advice can you give her?
A small city is evaluating disinfection requirements for their drinking water plant. With an average flow of 5 MGD and a peak flow of 9 MGD, determine the controlling CT factor (virus or giardia) when the water temperature is 23 degrees C.
Rope BCA passes through a pulley at point C and supports a crate at point A. Rope segment CD supports the pulley and is attached to an eye anchor embedded in a wall. Rope segment BC creates an angle of
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