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A completely mixed activated-sludge plan is being designed for a wastewater flow of 3.0 mgd. The BOD of 225 mg/l is 200 mg/l soluble. The effluent soluble BOD requirement is 7 mg/l (70 percent of the total 10 mg/l). For sizing, the mean cell residence time is to be 8 days at an MLSS of 2500 mg/l. Laboratory analysis resulted in Y=0.6 lb VSS/lb BOD, Kd=0.06 per day, K=5.0 per day, and Ks=60 mg/l. Calculate the aeration basin size (use a saftely factor of two times larger than waht is calculated) and he wate sludge rate.
A pipe 1ft in diameter bends through an angle of 135 degrees. The velocity of flow of gasoline ( S = 0.8) is 20ft/s and the pressure is 10psig in the bend. What external force is required to hold the bend against the action of the gasoline
Water is at 9000 kPa and 300 degrees celcius and flows through a partially open valve. Pressure immediately after the valve is measured to be 600 kPa. Calculate the specific internal energy of the water leaving the valve. Neglect kinetic energy ch..
The Earth's surface creates a boundary layer in the atmosphere. The velocity profile near the surface can be expressed as a power law, u = a * y n, where the constants a and n depend on the roughness of the surface.
The engine of an automobile supplies 180 hp at 2500 rpm to the drive shaft. If the maximum shearing stress in the drive shaft must be limited to 6 ksi, determine the minimum diameter required (in inches) for a solid drive shaft.
Determine the deflection of the right end of the pointer and the maximum deflection of the beam.
calculate the cracking moment (resisting moment) for an unreinforcedconcrete beam that is 10 in. wide, 16 in. high. assume normal weight concrete with 3000 psi = f prime sub c. use the internal couple method and check with the flexure formula.
Write the unit of measurement and unit of payment of following items. 1) Earthwork in excavation in foundation. 2) Framwork. 3) Steelwork in trusses. 4) Damp proof course D.P.C. 5) Cement.
A sample of natural glacial till was taken from below the groundwater table. The water content was found to be 52%. Estimate the wet density, dry density, buoyant density, porosity and void ratio. Clearly state any necessary assumptions.
In my english class i have to write a propasl, and i choose to write a proposal on the libray doors at my school. the doors are very difficult to open even for young people like my self. who should i contact
(a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?
Your engineering consulting firm has been asked to determine the specific weight of an unknown material. You decide to use the concept of buoyancy to figure this out. So you weigh the material in both air and water.
A 10cm diameter vertical tank holds 20cm of water topped with 15cm of ethyl alcohol. The cylinder is rotated about its central axis at a rotation rate of 20 rad/s. (a) What will be the shape of the air-alcohol and alcohol-water interfaces
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