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Raw primary sludge at a solids concentration of 3% is mixed with waste activated sludge at a solids concentration of 6,000 ppm. The flows are 20 and 25 gal/min, respectively. What is the resulting solids concentration? This mixture is next thickened to a solids concentration of 80,000mg/L solids. What are the quantities ( in gallons per minute)of the thickened sludge and thickener overflow (water) produced ? Assume perfect solids capture in the thickener. Also, draw a blackbox diagram for this problem. Show all work
A fine-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of mmonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8 degrees C does not nitrify.
To maintain a pressure of 300kPa at point 2, what the 15 C water is flowing at 0.5 L/s, what pressure must be provided at point 1 if you neglect friction
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
What would be operating income if 20,000 units of A, 80,000 units of B, and 100,000 units of C were sold? What is the new breakeven point in units if these relationships persist in the next period?
Develop a table that shows: 1) How many gallons of water are contained in the tank if the volume is measured in increments of 1 ft from the bottom to the top. 2) The mass of water at each increment, expressed in lbm.
What is the maximum length of trench that can excavated by hand economically rather than by a trenching machine. it cost 900.00 to transport a trenching machine to the job and back to the storage yard
The pressure drop in a 10 cm galvanized iron horizontal pipe (ks=.15mm) carrying water over a length of 50 m is 30 kPa. What is the flow rate
Assume the stream is 3ft wide and 1ft deep (assume a rectangular cross section. If the flow throught the stream is 1000 gallons/day and the concentration at the beginning of the stream is 250 ppm
The foof of the culvert will be located 3 m below ground surface. Currently the groundwater level is at ground surface. But, after installation of the culvert, the groundwater level is expected to drop 2 m below ground surface.
A previously calibrated rotometer is being used to measure a gas flow. Calculate the true volumetric flow rate of methane in the rotometer whe. The rotometer reads 4.0.
Given that an aircraft flying at FL350 encounters a tailwindof 35 knots and the instrument in the cockpit shows anindicated airspeed of 310 knots. What is the standard atmosphere atthis altitude?
You have determined that a 0.5 ppm concentration of copper sulfate should be applied to a lake to control the growth. The lake volume is 50 ac-ft. How many pounds of copper sulfate should be dissolved in the lake
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