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An agricultural waste lagoon has a total volume of 500 m3 and has an initial dissolved oxygen (DO) level at the saturation for 20 °C. This waste lagoon receives a discharge of 1,750 L of runoff containing an ammonium loading of 500 mg as N per liter. Assuming nitrification occurs in the waste lagoon, what is the final dissolved oxygen concentration (in mg/L) in the waste lagoon after all of the ammonium (NH4+) is converted to nitrate? Recall that 4.57 mg of O2 is need per mg of ammonium (as N) oxidized during nitirification. After all of the ammonium is converted to nitrate, would the waste lagoon be considered hypoxic.
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
Determine the required pumping rate. the aquifer has T= 1600 m 2 /day and the wells each have radius of influence of 600m.
A ten-foot high wall will retain a medium dense sand backfill. Determine the Rankine earth pressure diagram and the total active force on the wall.
Engineering ethics concepts and cases
The temperature of the poker at the third points of the poker using three elements of equal length. Use the finite element method. You may use Mathcad to solve this problem. If you do, please show all work and add comments to the Mathcad solution ..
A 2000-lb wheel load is to be supported by aggregate over soil with a maximum bearing pressure of 1000 lb/sqft. What depth of aggregate is needed if the angle theta is 40 degrees?
what is the engineering ethics course where to write about any engineering ethical case and discuss the ethical issue?
The gate is rectangular with a horizontal width of 2m perpendicular to the paper. For a depth h = 3m of water, calculate the required force exerted by the hydraulic cylinder to keep the gate just closed.
A four-lane freeway (two lanes in each direction) is on mountainous terrain with 11-ft lanes, a 5-ft right-side shoulder, interchange spacing of one every 10 miles, and a 60-mi/h base free-flow speed.
An approach to a pretimed signal with a 60 sec cycle has nine vehicles in the queue at the beginning of the effective green. Four of the nine vehicles in the queue are left over from the previous cycle.
If the elevation difference between the water surfaces is y = 25 + x/11 metres, what minimum pipeline diameter will be required to convey the design discharge? Once your design is complete, determine the actual discharge. The value of x equals 23.
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
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