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A wastewater is discharged to a stream with a reoxygenation constant of 0.5 day-1 and a velocity of 1 m/sec. The oxygen saturation concentration in the stream is 11 mg/L. Immediately downstream of the discharge the oxygen concentration is 9 mg/L and the deoxygenation constant is 0.3 day-1. Upstream of the discharge the ultimate oxygen demand is 8 mg/L and the stream flows at 20 million gallons per day. The plant discharges a waste which has an ultimate oxygen demand of 30 mg/L and has a flow rate of 8 million gallons per day. What will the lowest dissolved oxygen concentration be downstream of the discharge and how far down the stream will it occur?
The 3.0-ft diameter piper is 3,400 feet long with a steady flow rate of 10,000 gal/minozone (in mg/L) should be Injected at the head of the piper so what there will be an ozone concentration of 1.0mg/L
The measurements of the nominal shear strength (in kN) for a sample of 15 prestressed concrete beams are as follows: 580 400 428 825 850 875 920 550 575 750 636 360 590 735 950
Explain how the different physical characteristics and moisture content of soil lead to the different angles of repose, swell, and shrinkage factors. Explain how these factors affect excavation operations and costs.
The storage in a rectangular section irrigation channel is 20,000 m2 at a given time. Determine the storage 1 hour later if the average rates of inflow and outflow during the hour are 23 and 18 m3/s respectively.
The vertical velocity of the box at the time that it hits the surface is v= 5m/s. After impact the camera experiences an acceleration of a = -kx, where k is a constant and x is the compression of the packing material.
How to draw bending moment diagram for this shape and the value of the moment in critical sections assume that the distributed load (w) KN/M and the concentrated load
How far apart must two 18 m diameter tanks be placed such that their stress overlap is not greater than 10% of the contact stress at depths of 10, 20, and 30 m
During the following day the sun melts the ice cover. Determine the new depth if the flow rate remains the same and the surface roughness of the ice is essentially the same as that for the bottom and sides of the river.
Determine the maximum temperature in the tank. Take the thermal conductivity of the wastes as 2.0 W/mK.
If friction between the cars and the rails is neglected, what were the magnitude and the direction of the velecity of the cars after the collision?
The first pipe of 400mm diameter is 500 m long, the second pipe 600 m long, size 300mm, and the last pipe is 500m long of diameter 200mm. If the elevation difference between two reservoirs is 30m
How much calcium bicarbonate (kg/day) will need to be added per day in water with alkalinity of 30 mg/L CaCO3 to prevent rapid pH decrease (assume for simplicity inly bicarbonate alkalinity is present) if 794 kg of Al2(SO4)3 x 18H2O
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