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Two activated sludge aeration tanks in Podunk, MO are operated in series. Each tank has the follwing dimensions: 7.0 m wide x 28.0 m long x 3.5 m effective liquid depth. The plant operating parameters are:
Flow = 0.0945 m^3/s MLVSS = 1650 mg/L
BOD5 after pimary settling = 135 mg/L MLSS = 1.35 (MLVSS)
Determine the aeration period and F/M ratio for these operating conditions.
The stationary disk, of 300 mm radius, is attached to a pin support at D. The disk is held in place by the brake ABC in contact with the disk at C. The hydraulic actuator BE exerts a horizontal 400 N force on the brake at B.
The line is standard commercial steel pipe 75mm internal diameter. From the column to the pump inlet, the line is 25m long and contains 6 standard elbows and a fully open gate valve.
The space truss shown is supported by a ball-and-socket joint at D and by short links at A and C. Determine the support reactions and the force in each member of the space truss.
The particle-size characteristics of a soil are given in this table. Draw the particle-size distribution curve. X-axis is Particle Size and Y-axis is Percent Finer Particle Size (mm): 0.425, 0.033, 0.018, 0.01, 0.0062, 0.0035, 0.0018, 0.001.
A membrane biological treatment plant effluent must be disinfected to what level prior for use as unrestricted recycled water. For a flow of 4 mgd and peak flow of 6 mgd, how many lamps are required
The water enters at 1 atm at 10 C and the flow rate through the turbine is 40 m3/s. The water is discharged from the turbine 200 m below the intake at 1 atm and the temperature of the water at the discharge is 10.2 C.
You may pay $15,000 for an annuity that pays $2500 per year for the next 10 years . You want a real rate of return of 5% , and you estimated inflation will average 6% per year. Should you buy the annuity?
Determine the specific surfaces in m2/g units for the spheres of diameters (a) 10.0 cm, (b) 1.0 cm,(c) 0.1 cm, (d) 0.01 cm. (e) 0.001 cm and (f) 0.0001 cm. Assume the mass density of spheres as 2.5g/cc.
How was this answered reached? what equation was used? equation of a line? could you please explain how the answer was reached and a detailed explanation of the math behind it.
In what sequence are these oxidized compunds reduced by the bacteria, and why is the substrate that is reduced first preferred by the hydrogen acceptor. When do obnoxious odors appear
Two box culverts each is 0.61 m by 0.61 m and has n = 0.013, Ke = 0.05, Cd = 0.85, L = 30 m, So = 0.7%, and HW = 1.5 m. a. What is the design flow capacity for free outlet condition b. What is the design flow capacity for tailwater of TW = 1 m
Roe is the ratio of nonprestressed reinforcement in a section, and roe balanced is the ratio of tensile reinforcing producing balanced strain condition. Show cross sections, including bar sizes, arrangements, and spacing.
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