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A wastewater treatment plant uses an activated sludge process for secondary treatment of 0.300 cubic meters / second of primary effluent. The mixed liquor has a concentration of 2,100mg VSS/L, and the RAS concentration is 10,000mg VSS/L. The substrate concentration on the primary effluent is 220mg BOD5/L. THe F/M ration for the activated sludge tank is 0.52 mg BOD5 • mg VSS d(-1) • d(-1), and the cell residence time is 9.0d.
(a.) WHat is the volume of the activated sludge tank?
(b.) What is the WAS flow rate?
(c.) What is the flow rate of secondary treated effluent?
(d.) What is the hydraulic residence time for the activated sludge tank?
two forces applied as shown to a hook support. knowing that the magnitude of P is 35 N, determine by trigonometry the required angle if the resultant R of the two forces applied to the support is to be horizontal and the corresponding magnitude of..
The distance covered by an aerial photograph is determined by both the focal length of the camera and the tilt of the camera. Although the tilt is usually small, both archaeological and Canadian photographs often use larger tilts.
an equal-tangent sag vertical curve is designed with the PVC AT STation 109 + 00 and elevation 950 ft, the PVI at station 110 + 77 and elevation 947.34ft,and the low point at station 110 + 50 . Determine the design speed of the curve.
car traveling along a circular curve that has a radius of 50m. if its speed is 16m/s and is increasing uniformly at 8 m/s^2 determine the magnitude of its acceleration at this instant
A power plant emits 95 g/s of SO2 from an effective stack height of 60 m. The wind speed is 3 m/s and the solar insolation is slight. A) Estimate the ground level SO2 (ug/m^3) at a point 4 km directly downwind of the power plant
A ball is dropped from a boat so that it strikes the surface of a lake with a speed of 19.5ft/s. While in the water the ball experiences an acceleration of a = 10 - 0.8v, where a and v are expressed in ft/s^2 and ft/s, respectively
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 elevation of the lowest bottom of the structure is at 1470 feet. Calculate the maximum length (feet) of the parabolic curve required to meet the given conditions.
A solution of HOCl is prepared in water by adding 15 mg HOCl to a volumetric flask, and adding water to the 1.0 L mark. The final pH is measured to be 7.0. What are the concentrations of HOCl and OCl
At the end of 15 years, the first motor will have a salvage value of $50 and the second motor will have a salvage value of $100. consider the MARR to be 8%. (note : 1HP=0.7457 kw). Determine which motor should be installed based on the PW criterio..
Draw circle and put line with angle inside the circle that reflected in it. Make sure the measurement is punctual for each one. Angels required are 20-40-60 degrees. that means you have to draw three circles.
What is the length of a 2 degree increment along a (A) meridian and (B) parallel at 45N and 115W. Assume the radius of Earth is 6370 km.
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