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Calculate the size of an anaerobic digester required to treat the sludge from a primary clarifier designed to treat 38,000 m3/d of sewage. The quantity of dry volatile solids removed by the plant is 0.15 kg dry solids/m3 sewage. The sludge contains 95 % of moisture, and has a specific gravity of 1.02. The BOD loading to the digester is 5320 kg/d. The digester has the following characteristics: Solids retention time = 10 days, efficiency of waste utilization = 70%, Y =0.08 kg VSS/kg BOD utilized, kd = 0.03 d-1, digester gas is 65% methane.
Calculate: (a) the digester volume, and (b) the total gas production.
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
assuming that the contaminant travels mainly by advection, propose any operational changes to the given layout to prevent the river from being contaminated.
helium gas contains trace amounts of methane. Consider a helium balloon pressurized to 5 psi. If methane molar mixing ratio is 800 ppmv, what is the pressure of methane in the balloon
a ship has a cross-sectional area of 4000 ft^2 at the water line when the draft ( depth below the water line of the vessel bottom) is 10 ft. How many pounds of cargo will result in an increase of draft of 2 in ( specific weight is 64 Ib/ft^3 )
an insulated tank is evacuated. Air from the atmosphere at 12 psia and 70 degrees farenheight is allowed to flow into the 100 cubic foot tank. What is the final temp and the final mass of air in the tank just after flow ceases.
Ammonia vapor flows through a valve. It enters the valve at a pressure of 8 bar and a temperature of 120C and after going through a throttling process it exits at a pressure of 3.5 bar.
Determine the major and minor principal stresses at failure and the effective stress friction angle (assume c' = 0). Plot the Mohr diagram.
calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. The air temperature is 20`C, canary's body internal and surface temperature is 33`C
What is the maximum safe speed around the curve? If the speed limit on the roadway is 60mph, what action should be taken by the engineer?
A particular unit cell is cubic with ions of type A located at the corners and facecenters of the unit cell and ions of type B located at the midpoint of each edge of the cube and at the body centered position.
The grains of wood in the board make an angle of 20 degrees with the horizontal as shown. Determine the normal and shear stresses that act perpendicular and parallel to the grains if the board is subjected to an axial load of 250 N.(Dimensions l=3..
The minimum safe side slope for an excavation in a certain type of soil is 3 horizontal to 1 vertical. If a foundation excavation must be 40 ft wide x 60 ft long x 20 ft deep, How much soil must be removed from the site
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