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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.
A discharge of 2,200 ft^3/sec flows in a trapezoidal channel at a normal depth of 8.0 ft. The channel has a slope of 0.01, a 12-ft bottom width, and side slopes of 1:1 (H:V). Determine the manning coefficient of channel roughness
You plan to use a tank of total volume V= 10 m3 to remove a contaminant at concentration Cin = 1 g/m3 from a waste stream with a flow rate of Q = 1 m3/h. The reaction is first order with a rate constant k1 = 0.5 h-1.
A 1-m^3 volume tank contains a mixture of 18.32 moles of oxygen, 16.40 moles of Nitrogen, and 6.15 moles of carbondioxide. What is the partial pressure of each gass componet at 25 degrees
Determine the degree of saturation of a sample of soil given that its maximum dry unit weight is 18 kN/m^3 and its optimum moisture content is 12.1%. Assume the Specific Gravity of soil is 2.65.
A rural freeway has an ideal free-flow speed of 120 km/h and two 3.6 m lanes in each direction, with right shoulder lateral clearance of 1.2 m. Interchanges are spaced approximately 5 km apart. Traffic consists of 10 percent trucks and buses and 8..
Determine the magnitude and direction of the force P in so that the resultant of P and the 900N force is a vertical force of 2700N directed downward using.
A 175 Mi^2 watershed has a 4200 acre reservior within its boundary . The annual watershed runoff to the reservior is 13in. A flow of 120 mgd (368 ac-ft/day) is to be drafted from the reservior. The annual rainfall is 38in.
A plunger applies pressure to the water. If, with zero force, the initial length of the water column is 25.00 in, what will it's length be if a force of 420lbs is applied to the plunger. Assume no leakage and no friction.
If an additional 11ft lane is added (each direction) and all other factors stay the same, what will be the new level of service?
If design is needed, use a W-built-up cross section; select the W section and the thickness of the plate. Calculate Cc and use the AISC equations E2-1 and E2-2 to determine the allowable stress for each axis and ultimately the allowable load for t..
a silty material is to be used to fill an earth damn. How much water must be added to bring the water content of each ton (2000 lb) of the material to 35% if the original watter content is 11.4%
Given that uniform flow is subcrital and there is a weir in a rectangular channel, how do you determine what the weir height should be to force the flow to be critical. Draw this transition on a specific energy curve.
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