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A POTW (a.k.a. waste water plant) 1.0 m^3/s of treated effluent having an ultimate BOD of 30mg/L and DO = 2 mg/L into a stream that has a flow of 8 m^3/s, a BOD = 5.0 mg/L and DO = 9 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation constant kd of 0.2 d-1, an average flow speed of 0.3 m/s, and an average depth of 3.0 m. Assume a reaeration constant of 0.6 d^-1.
a. Assuming complete and instantaneous mixing, estimate the ultimate BOD of the river just downstream from the outfall.
b. Assuming complete and instantaneous mixing, estimate the dissolved oxygen deficit just downstream from the outfall.
c. Find the time and distance downstream at which the oxygen deficit is a maximum.
d. Find the minimum value of DO.
a 3200-lb car (Cd = 0.35, Af = 25ft^2, and p= 0.002378 slugs/ft^3) has 14-inch-radius wheels, a drivetrain efficiency of 93%, an overall gear reducation ratio of 3.2 to 1, and drive axle slippage of 3.5%. the engine develops a maximum torque of 21..
A municipal water supply became contaminated with benzene (Cw=50g/L). It was decided that until the contaminant source could be identified and remediated, all household faucets would be fitted with a granular activated carbon(GAC) filter bed to ad..
a spot speed study was conducted on a freeway on which the mean speed and the standard deviation were found to be 72 .4 mi/hr and 5.4 mi/hr, respectively. what is the range of the values that would be expected to contain the middle 95 percent of s..
If a 96-inch brick sewer (n = 0.015) is laid on a slope of 0.01% is set to be rehabilitated with GIPL (n = 0.01) that will need 2-inches all around it. How much more flow, in cfs will be attained with this project
An excursion train, travelling at 80ft/s, encounters a rain shower. The point A lies directly 8ft. beneath the lip of an overhang in the observation car. The raindrops can be assumed to be falling at a constant speed of 40ft/s.
Water flows through a horizotal 45 deg reducing bend with a 36 inch. diameter upstream and a 24 inch diameter downstream, at the rate of 20 cfs under a pressure of 15 psi at the upstream end of the bend. Neglecting head loss in the bend, calculate..
A 3220-lb car enters an S-curve at A with a speed of 60 mi/hr with brakes applied to reduce the speed to 45 mi/hr at a uniform rate in a distance of 300 ft measured along the curve from A to B.
What is the risk of constructing a harbor which will be unprotected from wave attack during its construction.
A distance of 200 ft must be taped in a manner to ensure a standard deviation smaller than ± 0.03 ft. What must be the standard deviation per 100 ft tape length to achieve the desired precision?
A falling-head permeability test was carried out on a clay soil of diameter 10 cm and length 15 cm. In 1 hour the head in the standpipe of diameter 5 mm dropped from 68 cm to 50.2 cm. Calculate the hydraulic conductivity of this clay.
The pesticide methyl parathion is leached into a stream from an abandoned disposal site. Is photolysis likely to be a significant sink for this chemical. If the travel time to the ocean is 5 days
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.
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