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A POTW facility that operates an anaerobic digestion process generates 2200 tones of waste water sludge per year. The solids content of the raw sludge is 4% by weight. The dry weight concentrations (mg/Kg) of cadmium, copper and lead in the sludge are 50, 1250, and 250, respectively. Two options for the sludge are being considered:
1. First, it is thought that the sludge can be incinerated. If the heat value of dried sludge is 12,804KJ/Kg dry solid and the heat of vaporization of water is 40.656KJ/mol of water, what does the water content of the sludge need to be in order to "break even" in energy?
2. Second, it is thought that the sludge could be used for land application. What is the permitted application rate of this bio-solid to a hectare of land? How many hectares of land can be fertilized at this rate? Assuming no losses of these metals to the land, how many years can land application be performed?
determine critical depth in a circular pipe of 36 inches diameter and roughness coefficient of 0.015. The flow rate is 15 cfs. So = 0.002
How to calculate the principle of shoring system in formwork analysis when the secondly floor upper has been poured?
CPM Construction plans to buy a truck for $150,000 and sell it for $15,000 at the end of 5 years. The annual operating cost of the vehicle is $60,000. What is the present value of the truck
The electrical power supplied to the motor is 90 kW. The motor in turn delivers 100 hp at a speed of 1000 rpm to a hoist arrangement for an elevator. Define the electric motor as the system and calculate the rate of work for the system.
A 100% saturated soil has a wet unit weight of 112.8 lb/ft^3, and its water content is 42%. Find the void ratio and specific gravity of solids.
Assume that 30% of the ash falls out as bottom ash in the furnace. Calculate the efficiency of an ESP (electrostatic precipitator) required to meet federal new source performance standards
At the same instant the frame h, not the horizontal blade, rotates about a vertical axis with a constant angular velocity w=0.9 rad/s, measured relative to h
John had a little business on the side and did not have a girlfriend when he was at school and ehnce he was able to save the $10,000 for his dream car. The dealer agrees to take the car back for $8000
A solid ball starts to roll up a hill with an initial velocity of 50m/s. The ball has a mass of 20 Kg with a 0.75 m radius. How high did the ball roll before it momentarily stopped
If the rate of travel of the ram u is 0.5 fps, find the frictional resistance, F when 6 ft of the ram is engaged in the cylinder.
Compare the three-decimal-place values of the two approximations at x=(1/2) with the value y(1/2) of the actual solution . then do the same for PART B: y'=-2xy , y(0)=2 ; y(x)=2e^(-x^2)
An 18-m-long steel wire of 5-mm diameter is to be used in the manufacture of a pretested concrete beam.It is observed that the wire stretches 45 mm when a tensile force P is applied.
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