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Calculate the length of 10 equal-sized aeration basins for secondary treatment of a wastewater flow of 10 MGD with 20,000 lb of BOD per day for a conventional activated sludge process with a maximum loading of 40 lb BOD/ 1000 ft3*d. The depth and width of each basin are 15 ft and 30 ft, respectively.
For a flow of 2 MGD, an influent BOD of 200 mg/l, a depth of 8 feet, and a desired effluent BOD concentration of 20 mg/l, determine the volume required for trickling filtration treatment as predicted for single-stage treatment by using NRC equatio..
The boat is travelling along a circular path with a speed v=(0.0625t). Determine the magnitude of its acceleration when t=10s
A concrete building has floor area 10 m by 20 m and is 4 m high. THe building has four windows with a height 1.6 m and a width 2 m. After 10 minutes gases in the room have an average temperature of 700 degree Celcius.
Air enters an adiabatic nozzle steadily at 300 kPa, 200 o C, and 30 m/s and leaves at 100 kPa and 180 m/s. The inlet area of the nozzle is 80 cm 2 . Determine (a) the mass flow raw through the nozzle, (b) the exit temperature of the air, and (c) the ..
A municipal WWTP discharges 22.5 MGD of secondary effluent containing 45 mg/L of ultimate BOD at 26.7 C with 1.3 mg/L of dissovled oxygen. The stream flow is 237 ft^3/s at an average velocity of 2.1 ft/s and an average depth of 7ft.
A body weighing 120 lb with a flat surface area of 2 ft^2 slides down a lubricated inclined plane making a 30 degree with the horizontal. For a viscosity of 0.002 lb*s/ft^2 and body speed of 3 ft/s, determine the lubricant film thickness.
Calculate the compacted cubic yards per hour if a compactor with a 5-ft drum width travels at 3 mph over a 10-in. lift of aggregate base course with 4 passes required to meet density specifications under average operating conditions.
Determine the bulk modulus of elasticity (in N/m^2) of a liquid that has a 1.10 percent volume decrease because of an increase in pressure from 1,000 N / cm^2 to 11,000 N / cm^2.
The aerodynamic drag of a new sports car is to be predicted at a speed of 50mph at an air temperature of 25 degrees Celcius. Automotive engineers build a one-fifth scale model of the car to test in a wind tunnel.
A simple curve has a central angle of 42degreess. A point Y is located 24m from the vertex and has a perpendicular distance of 3.00m from the back tangent.
Ethylene enters a turbine at 10 bar and 450 K, and exhausts at (atm) and 325 K. For mass flow in = 4.5 kg s^-1, determine the cost C of the turbine. State any assumptions you make. Data: H1 = 761.1 , H2 = 536.9 kg^-1, C/$ = (15,200)(1W1/kW)^0.573
suppose we have a 100-volt battery connected with a 100-ohm resistance. The current is then 100/100=1 amp. how much power is produced. if we double the voltage, what will the current be and what will the power be.
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