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A waste water treatment plant previously used two circular clarifiers for primary settling, each 42 ft in diameter and 12 feet deep. Assume the incoming flow rate was 0.9 MGD. The maximum allowable clarifier loading rate is 600 gal/d/ft^2
A) Calculate the actual overflow rate (gal/d/ft^2) in each clarifier, assuming the flow was equally split between the two. Were they meeting the overflow rate requirement?
B)Calculate the detention time (Hr) in each clarifier.
The plant is to employ alum coagulation. and pertient data for the folcculation basin are as follows: detention time = 20 min, G = 35 /sec at 50F, GT = 10000 to 100000, width = 1.25 depth, length = 2width, no baffling, number of impellers = 2
A signal approach has 20 seconds of displayed green, 4 seconds of yellow, and 3 seconds of all red (assume typical start-up, lost time, and clearance time). The cycle length is 60 seconds.
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
Also calculate the deflection of the beam to check that it complies with the design limit of L/200. Only variable actions are required for deflection check.
The siphon crown is 1.2m above the water surface elevation of the reservoir and a length of 10m away from the siphon entrance. If the siphon diameter is 30 cm, the friction factor is 0.2, and the head loss coefficients are 0.2 inlet and 0.1 exit,
An automobile company is planning to build a 1.8 million square foot factory in Auburn. Estimate the expected number of trip ends at the factory on an average weekday.
water flows at a velocity of 25 ft/s at a depth in a rectangular channel 16 feet wide. Determine the downstream depth necessary to form a hydraulic jump, the head loss through the jump and the horsepower dissipated in the jump.
If the pipe lengths ar L1 = 3000ft, L2 = 2200, and L3 = 1600 ft the respective pipe diameters are 15,10, and 18in, and the surface water elevations of two of the three reservoirs are A = 125ft and B = 55ft, find the surface water elevation of Rese..
A variable-order reaction A-->B has the following rate expression: R(a) = -kC(a)/(K+C(a)) where k = 5mg/L-hr and K=40mg/L The reaction is to take place in a batch reactor. The initial concentration is 450 mg/L
Write an equation on the line containing the given point and parallel given line. Express answer in the form y=mx+b (3,7) x+6y=5
A soil sample is prepared in the laboratory by mixing a certain amount of dry soil with 10.5 wt% water. The relative density of the grains of the material is equal to 2.7.
A steady flow of refrigerant 134a enters a throttling valve in a refrigeration unit as a satrurated liquid with a pressure of 150 psia. The refrigerant is discharged with a pressure of 40 psia.
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