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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?
A beryllium copper wire having diameter of 1-50 mm and length of 40mm is used as a small torsion bar in an instrument. determine what angle of twist would result in the wire when it is stressed to 250 mpa.
when their spacing is h, what is the radial component of convective acceleration at the section just inside the edge of the disk (section A) in terms of D, V, and h. assume uniform velocity distribution across the section.
Assume that the sludge does not change density during filtration and that liquid removed from the sludge contains no sludge. Using mass-balance method. determine the volume of sludge after filtration.
laminar flow of a real fluid down a cylindrical pipe of constant radius R. Poiseuille showed that the velocity profile was parabolic and given by u(r)=c(R^2-r^2), where r is the radial coordinate and c is a dimensional constant.
If the critical point in a DO sag curve is found to be 18km downstream from the discharge point of untreated wastewater, would you expect the critical point to move upstream (toward the discharge point)
for a uniformly loaded square area, what is the stress to load ratio at a depth of 2B below the CENTER of the loaded area
At what speed the rule of 25 feet separation between two cars is safe?
A reaction in a batch system is assumed to be first order. Data listed below was collected. Determine the reaction rate constant. chemical concentration (ug/L) time(min) 19.3 6
You have determined that a 0.5 ppm concentration of copper sulfate should be applied to a lake to control the growth. The lake volume is 50 ac-ft. How many pounds of copper sulfate should be dissolved in the lake
The current price of a company stock is $20.The company is a takeover target.If the takeover is successful.the company's stock price will increase to $30.If the takeover is unsuccessful.the stock price will drop to $12.
A body slides down a frictionless plane and during the third second after starting from rest if it travels 20.4m. What is the angle of inclination of the plane?
A Carnot heat engine is supplied with a high temperature heat source at a rate of 200 kW. If the power output of the heat engine is 120 kW, determine the required source temperature if the heat sink temperature is 20 °C.
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