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A POTW (a.k.a. waste water plant) 1.0 m^3/s of treated effluent having an ultimate BOD of 30mg/L and DO = 2 mg/L into a stream that has a flow of 8 m^3/s, a BOD = 5.0 mg/L and DO = 9 mg/L. The river and waste mixture has a temperature of 20°C, a deoxygenation constant kd of 0.2 d-1, an average flow speed of 0.3 m/s, and an average depth of 3.0 m. Assume a reaeration constant of 0.6 d^-1.
a. Assuming complete and instantaneous mixing, estimate the ultimate BOD of the river just downstream from the outfall.
b. Assuming complete and instantaneous mixing, estimate the dissolved oxygen deficit just downstream from the outfall.
c. Find the time and distance downstream at which the oxygen deficit is a maximum.
d. Find the minimum value of DO.
knowing the tension in cable AC is 1065 N, determine the moment about each of the coordinate axes of the force exerted on the plate at C
Determine the mass ratio, For a vehicle in gravitationless space, determine the mass ratio necessary to boost the vehicle velocity by 1600 m/sec
an iron cube at 400 degrees Celsius is dropped into a insulated bath containing 10kg of water 25 degrees Celsius. the water finally reaches a temperature of 50 degrees Celsius at steady state.
A tank containing acetone at 20 oC has a drain pipe connected vertically at the bottom. The pipe is made of galvanized iron, 0.5 in NPS Schedule 40 with length L= 2m. The acetone depth in the tank is H= 5 m.
A tied short column of square cross-section is subjected to a factored axial load of 2500 kN and a factored bending moment of 175 kN.m. Use a 40 mm clear cover to the ties and a 20 mm maximum aggregate size.
given that E for the tube material is 70 GN/m2 and the stool legs are 75cm long, how much will each leg shorten under the applied compressive load (take g = 9.8m/s2)
A 3-mm thick panel (1 m x 1 m) of aluminum alloy (k = 177 W/m. K, Cp = 875 J/kg. K, and p(rho)= 2770 kg/m3) is heated in a large oven with air at T = 175oC and a convective heat transfer coefficient of h = 40 W/m2.K.
A sand sample has a porosity of 38% and specific gravity of solids of 2.66. Find the void ratio and wet unit weight in lb / ft3 if the degree of saturation is 35%.
a section of highway has the following flow- density relationship: q= 50k - 0.156k^2 what is the capacity of the highway section, the speed at capacity, and the density when the highway is at one-quarter of its capacity
The flow is assumed to be laminar and the film thickness, H, constant. Using a coordinate system located on the plate at the surface of the pool, complete the following: a. Dram and sketch the system. Include coordinate system in your sketch.
A river discharges at a rate of 500 cfs into a lake. The water is drawn from the lake at a rate of 200 cfs. The surface area of the lake is 60 acres (1 acre = 43, 560 ft2). What is the rate of water rise in the lake in one day
Determine whether these conditions are true or false.
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