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1. A new wastewater-treatment plant proposes a discharge of 5 m3/s of treated waste to a river. State regulations prohibit discharges that would raise the ultimate CBOD of the river above 10 mg/L The river has a flow of 5 m3/s and an ultimate CBOD of 2 mg/L Calculate the maximum 5-day CBOD that can be discharged without violating state regulations. Assume a CBOD decay coefficient of 0.1 day-1 for both the river and the proposed treatment plant.
2.A river flowing with a velocity of 20 km/d has an ultimate CBOD of 20 mg/L. If the organic matter has a decay coefficient of 0.2 day-1, what is the ultimate CBOD 40 km downstream?
Also, for each case, determine the corresponding orientation of the element with respect to the element shown and sketch the results on the element.
A one-dimensional consolidation test gave the following results: Cc = 0.32, Cr = 0.06, and OCR = 6. In the field, the groundwater level is at the ground surface.
Calculate the thermal efficiency of the cycle and the specific network.
if the rolling resistance is 1/100 of the weight of the car, determine the compression of each spring when the car is momentarily brought to rest spring 1 500kN/m spring 2 300kN/m and distance between springs and car 30m
A laptop has a four year life span with an initial cost of $900 and $100 salvage value. According to the straight line method what is the depreciation charges you expect on the laptop
The force F is acting on the boom ABC at C points in the direction of the unit vector 0.7071i-0.7071j and its magnitude is 10kN. The boom is supported by a ball and socket at A and cables BD and BE.
On a shovel/truck operation the production of the shovel is 293 BCY/h and a job efficiency of 0.75. The trucks used have a capacity of 12 BCY and have a cycle time of 45 min.(excluding loading).
A conventional water treatment plant treats 2.40m^3*s^-1 of river water. The filters in the plant are 8.0x8.0m surface area and operate on the following schedule. A filter is cleaned once in each 24-hr period
Car B is driving straight toward the point O at a constant speed v. An observer, located at A, tracts the car with a radar gun. What is the speed |r(dot)B/A| that the observer at A records
A car travels along a horizontal circular curved road that has aradius of 600 m. If the speed is uniformly increased at a rate of2000 km/ h2 , determine the magnitude of theacceleration at the instant the speed of the car is 60 km/h.
Cross-sections of the arch are equilateral triangles, and (x,y) traces teh path of the centers of mass of the triangles whose area is given by the following equation:
The plane of the frame is vertical. Determine the horizontal acceleration α of the frame necessary to maintain the collar in a fixed position on the shaft.
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