Engineering, 25.11.2019 21:31, littleprinces
Aerobic pond is used as a secondary wastewater treatment operation for small communities. the pond is usually shallow enough so that it can be assumed as a well-mixed aerobic reactor. the inflow rate of wastewater entering a 200m^3-aerobic pond is 50 m^3/d and has a substrate (so) concentration of 95 mg bod5/l. the microbe concentration (xo) in the influent is small and can be neglected. the microbial growth and substrate consumption in the pond can be described by the monod equations:
a. assuming the pond is in steady state, write mass balance equation for the microorganism concentration (x) and solve the equation to derive an expression for the substrate (s) concentration as a function of the hydraulic detention time. calculate s using the equation you derived. (ks=60 mgbod5/l, y=0.6 mg vss/mg bod5, k_d=0.06 day-1, mu_m=3 day-1)
b. write the mass balance equation for the substrate in the pond and solve it for the microbe concentration (x) as a function of the substrate concentration and hydraulic detention time. calculate x using the equation you derived.
Answers: 2
Engineering, 04.07.2019 18:10, niyawilliams23
Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10
Answers: 1
Engineering, 04.07.2019 18:10, keigleyhannah30
Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.
Answers: 3
Aerobic pond is used as a secondary wastewater treatment operation for small communities. the pond i...
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