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1. An industry discharges 0.5 m3/s of a waste with a 5-day CBOD of 500 mg/L to a river with a flow of 2 m3/s and a 5-day CBOD of 2 mg/L Calculate the 5-day CBOD of the river after mixing with the waste.
2. A waste having an ultimate CBOD of 1,000 mg/L is discharged to a river at a rate of 2 m3/s. The river has an ultimate CBOD of 10 mg/L and is flowing at a rate of 8 m3/s. Assuming a reaction-rate coefficient of 0.1/day, calculate the ultimate and 5-day CBOD of the waste at the point of dis-charge (0 km) and 20 km downstream. The river is flowing at a velocity of 10 km/day.
Derive an equation for the factor of safety of the slope in Figure P16.2 using the mechanism shown.
A 5-m wide rectangular channel is carrying a flow of 5 cubic meter per second. If the Manning n=0.013 and the bottom slope, So=0.0001, determine the normal depth using a converging iteration.
An offshore drilling rig is being towed out to sea. What is the maximum distance away that the navigation lights can still be seen by an observer standing at the shoreline? The observer's eye height is 5'8", and the uppermost navigation light is 130 ..
At this point, surveyors A and B determine the distance between them to be 43.6 ft. Surveyor A then sets the clinometer to 0º and sights surveyor B; this horizontal line of sight cuts surveyor B at a distance of 3.8 ft above the ground. Determine ..
A 250 cubic meter reaction tank contains a waste water having an ultimate BOD concentration of 755 mg/L. If the BOD reaction rate constant is -0.352/day, how much BOD is remaining after 12.0 days
A thin wire ring, 3 cm in diameter, is lifted from a water surfaceat 20 C (DEGREE CENTIGRADE). Neglecting the wire weight, what isthe force required to lift the ring? is this a good way to measuresurface tension? should the wire be made of any partic..
At the same instant the frame h, not the horizontal blade, rotates about a vertical axis with a constant angular velocity w=0.9 rad/s, measured relative to h
For the following waste and river characteristics just upstream from the outfall, find the minimum downstream DO that could be expected
A 1600 ft long sag verical curve (equal tangent) has a pvc at station 1200+00 and elevation o 1500 ft. the initial grade is -3.5% and the final grade is 6.5%. determine the elevation and stationing of the low point, pvi and pvt.
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
How to design a simply supported rectangular concrete beam havingcross section of 20 mm by 40 mm and a length of 3 meters that couldcarry a uniform load of 1000 KN.
Which reactor requires the least Volume? Briefly explain why the PFR and CMFR volumes are different for achieving the same degree of pathogen reduction.
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