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Ottawa's anaerobic digester produces 13m3/day of sludge with a suspended solids concentration of 7.8%. WHat volume of sludge must they dispose of each year if their sand drying beds yield a solids concentration of 35%?
The aquifer characteristics are: Ambient temperature=8 oC Hydraulic conductivity = 123 ft/day Hydraulic gradient = 0.00091 ft/ft Effective porosity = 0.31 Total organic carbon = 198 mg/kg Bulk density = 1.65 g/cm3
Calcium sulfate (CaSO4, solubility product Ksp=2*10^-5 M^2), is added to initially pure water, such that solid CaSO4 remains at equilibrium. (Assume the sulfate does not participate in reaction other than the solubility product; no HSO4- formed).
Determine if a simple supported W 12x26 (A36 steel) beam has the capacity to support loads that produce 50 kips of live-load shear and 20 kips of dead-load shera.
If the allowable shear stress is 15ksi, determine the diameter of a solid shaft if it is to transmit 50hp at a frequency of (a) 900rpm, (b) 1800rpm
The weights on the same axles when the truck is empty and leaving the power plant are 10 kips, 12 kips, and 8 kips, respectively. A two lane road is to be designed to serve the power plant and to last for a period of 10 years. a) What is the equiv..
Water is pumped at a rate of 1.57 cfs from one large open tank into another through a 6 in diameter cast iron pipe 400 ft long. The water level in the second tank is 160 ft above the level of the first tank and the discharge end of the pipe is sub..
Calculate Earth's gravitational force on the Shuttle astronauts while orbiting at an altitude of 220 miles (or 354 km) above Earth's surface.
if a clay slope at a construction site fails derive an equation for the undrained shear strength of the clay given that the shear reistance along L of the slope can be given as: (SuH0)/ sin beta
An activated sludge tank, 30 x 30 x 200 ft, is designed as a plug-flow reactor, with an influent BOD of 200 mg/L and a flow rate of 1 million gallons per day. a. If BOD removal is first-order reaction, and the rate constant is 2.5 days^-1, what is ..
Vehicles begin to arrive at a toll booth at 850 am with an arrival rate of x(t) = 4.1 + .01t (with t in min and x(t) in veh /min.) The toll booth opens at 9am and processes vehicles at a rate of 12 per minute throughout the day. Assuming D/D/1 que..
A U manometer reads 20 cm air as operating fluid and a given manometric fluid. A single branch closed tube reads 35 cm connected to point 1. If P2 = 1.2 ATM calculate the pressure in point 1 and the density of the manometric fluid.
Introduction to management science, The Dynaco Manufacturing Company produces a particular product in an assembly line operation. One of the machines on the line is a drill press that has a single assembly line feeding into it.
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