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Incoming wastewater , with BOD5 equal to about 200mg/l is treated in well-run secondery treatment plant remove 90 percent of the BOD. you are to run five-day BOD test with a stander 300-ml bottle , using mixture of treated sewage and dilution water(no seed) assume the intial DOis 9.2mg/l
A)roughly what is the maximum Volume of treated wastewater should you put in the bottle if you want to have at least 2.0mg/l of DO at the test (filling the rest of the bottle with the water
b) if you make mixture half water and half treated wastewater, what DO would you expect after five days?
A leveling rod is held vertically on another point N. When a sight is taken on the rod, the telescope is inclined so that the horizontal cross line of the transit intersects the rod at a reading of 4.9 ft.
Plot the distribution of vertical effective stress and porewater pressure with depth if the void ratio of the sand is 0.6 and the degree of saturation is 90%. Neglect pore air pressure
Given that an aircraft flying at FL350 encounters a tailwindof 35 knots and the instrument in the cockpit shows anindicated airspeed of 310 knots. What is the standard atmosphere atthis altitude?
Write out the steps for the aldol condensation reaction between the enolate anion of propanal with pentanal.
An intersection approach has three lanes, permitted left turns, and 6% left-turning volume with a through vehicle equivalent of 5.0 tvu/left turn. The saturation flow rate for through vehicles under prevailing conditions is 1,700 veh/hg/ln.
A very small country has just gained independence in the year 2000, at which time its population was 1,000. The new country has a birth rate of 0.02 yr-1, death rate of 0.004 yr-1, immigration rate of 0.01 yr-1, and emigration rate of 0.005 yr-1.
Online professor's response to: Probability problems, A very rich investor has a small amount of spare cash which she wishes to invest. She has four options to choose from.
If a W14x53 is 20 ft long (simply supported) and is loadeduniformly to its moment capacity what is the maximumdeflection? What will be the uniform load so to get the maximum deflection?
A plane flow field is developed by addition of a free vortex and a uniform stream in the positive x direction. If the vortex is located a distance a from the origin, find the pressure variation in the flow field.
It is proposed to estimate the seepage flow rate through the foundation soil using the flow net sketching technique. For this purpose, calculate the horizontal scale factor and effective hydraulic conductivity of the foundation soil.
An activated sludge tank, 30 x 30 x 200 ft, is designed as a plug-flow reactor, with an influent BOD of 200 mg/L and a flow rate of 1 million gallons per day. a. If BOD removal is first-order reaction, and the rate constant is 2.5 days^-1, what is ..
The speed limit for a highway is given as "V" in mph. The highway super elevation is given as "e" in ft/ft. The friction between tires and wet pavement is given as "f".
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