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A perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 cubic meters/day of influent with a BOD5 of 350 mg/L that must be reduced to 20 mg/L before discharge. It has been found that the kinetic constants for the system are Ks=100mg/L, BOD5 kd=0.10 d^(-1),?m=1.6 d^(-1), and Y is 0.60 mg VS/mg BOD5.
(a) What must the hydraulic detention time be in the aeration pond?
(b) What mass of microbes will be produced in the pond each day?
A fully penetrating well of 30 cm diameter in an unconfined aquifer of saturated thickness 50 m was found to give the following draw down - discharge relationship under equillibium condition.
Fresh water enters the process in 3 streams – approx. 0.5 ML/d enters with chemicals at the dry end of the machine, approx. 1 ML/d enters at the wet end of the machine and the boiler consumes approx. 0.2 ML/d.
A multinational engineering consulting firm that wants to provide resort accommodations to certain clients is considering the purchase of a three-bedroom lodge in upper Montana that will cost $250,000.
Steam enters an adiabatic turbine steadily at 3 MPa and 300 *C and leaves at 70 Kpa and 100 *C. If the power output of the turbine is 2 MW, determine a) the isentropic efficiency of the turbine and b) the mass flow rate of the steam flowing throug..
Design a parshall flume to handle 24mgd in a 10ft wide channel at a downstream depth of 3 ft. If the channel floor is at elevation 65.7ft, what is the water elevation upstream of the flume
Write the following iterated integral as a double integral with aregion R, and use the change of variables to compute the integral:∫x=2x=0∫y=√(2x-x²)y=0√(x²+y²) dy dx
Dust is removed from the airstream of a municipal incinerator by four dust collectors operating in parallel, each handling 1/4 of the total airflow of 200 m3/min. The airstream contains 10 g/m3 of suspended solids.
If the free surface at a distance from the axis of the vortex, which is sufficient for its effect to be negligible, is 180 mm above datum, what will be the height above datum of a point B on the free surface at a radius of 100 mm
If the viscosity of the liquid is 10–3 N-s/m2, what is the maximum shear stress in the liquid?
A constant head permeability test was conducted on a clean sand sample. The diameter and length of the test specimen were 10 cm and 12 cm respectively.
In determining the difference between points A and B, the inclined distance was measured to be 157.65 ft. The transit was set u on point A. The height of its transverse axis was 5.2 ft about point A
Design a horizontal curve with a 40-degree central angle (delta=40) for a two-lane road with 11-ft lanes. The design speed is 70 mi/h and superelevation is limited to 0.06ft/ft. Give radius, degree of curvature, and length of curve
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