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Determine the activated sludge aeration volume required to treat 2.64 mgd with a BOD of 120 mg/l based on the criteria of a maximum BOD loading of 40 lb/1000 ft cubed/day and a minimum aeration period of 5 hr. Assuming an operating F/M of 0.2 lb BOD/day per lb of MLSS, calculate the MLSS to be maintained in the aeration tank. Estimate the operating sludge age (mean cell residence time), assuming an effluent suspended solids of 30 mg/l and the daily amount of waste sludge solids. Determine the diameter and side water depth of two identical final clarifiers for this activated sludge system.
emissions from waste oil combustion may be estimated using ap-42 1.11. A small boler is operated from 10/15/2012 through 4/15/2013 and it is used to burn 45 gallons per hour of a blended waste oil having an ash content of 7%
A $125,000 tractor trailer is being depreciated by the Stright Line method over five years to a final Book Value of zero. Half year convention does not apply to this asset, After three years the rig is sold for A
Raw primary sludge at a solids concentration of 4% is mixed with waste activated sludge at a solids concentration of 0.5%. The flows are 20 and 24 gal/min, respectively. What is the resulting solids concentration
If a flow of 5.0 cfs is to be carried by an 11000 ft cast-iron pipeline without exceeding a head loss of 137 ft, what must the pipe diameter be
One cubic metre of nitrogen at 40 degrees Celsius and 340KPa is compressed isothermally to .2(m^3). What is the pressure when the nitrogen is reduced to this volume. What is the modulus of elasticity at the beginning and end of the compression.
The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3. a) What fraction of the herbicide is adsorbed, and what fraction is dissolve..
The gate is rectangular with a horizontal width of 2m perpendicular to the paper. For a depth h = 3m of water, calculate the required force exerted by the hydraulic cylinder to keep the gate just closed.
What are the major nutrients required for growth of microbial population in wastewater treatment plants. List the major differences and similarities between hetrotrophic bacteria and nitrifying bacteria.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
Write a HCS12 assembly-language program that counts all even numbers from a 10-variable, byte-sized array and moves the odd numbers to a new array.
Set up a table showing curve elevations at the PVC, at the PVT, and at the half-station points along the curve. Compute the station and elevation of the curve turning point.
Water enters the pump of a steam power plant as saturated liquid at 20 kPa at a rate of 45 kg/s and exits at 6 MPa. Neglecting the changes in kinetic and potential energies and assuming the process to be reversible
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