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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
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
a tank is filled with oil (specific gravity 0.8) and water to a depth of 10 meter and 6 meter respectively. Find the resultant force from all fluids acting on the gate of 1.8 meter by 9 meter.
A Proctor compaction test in the laboratory on a borrow pit soil gives a maximum dry unit weight of 19 kN/m3 and optimum water content of 11.5%. The bulk unit weight and water content of the soil in the borrow pit are 17.2 kN/m3
You are going to assemble 1,000 bolt + hole combinations. The bolts have a mean diameter of 1.000 cm, normally distributed with standard deviation of 0.010 cm. The holes have a mean diameter of 1.030 cm, normally distributed with standard deviatio..
One of the wells pumps at a rate of 1240 m3/ day and the second well pumps at 850 m3/ day. If the aquifer has a transmissivity of 2000 m2/ day and a storage coefficient of 4 x 10^-4, when would the wells start interfering with each other
the front of our library has six double doors and the doors rotate open in the middle making less clerance room how can i get started
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
Rainwater runoff from a 200 x 500 ft parking lot is to drain through a circular concrete pipe that is laid on a slope of 5 ft/mi. Determine the pipe diameter if it is to be full with a steady rainfall of 1.5 in/hr
The velocity of propagation, c of surface waves is assumed to depend on the water depth, y, the water density, and the acceleration due to gravity, g. Express these variables as a dimensionless group.
A 4 mgd water treatment planet is being designed for an overflow rate of 0.5 gpm/ft^2. If two circular sedimentation basins will be used at al times, what should be the diameter of each basin
Water flows at 0.32 m^3/s through a 600-mm-diameter pipeline with a head loss of 0.0029 m/m. Find the value of the Hazen Williams coefficient.
A 40 mm diameter solid brass shaft in a marine vessel is subjected to a simultaneous torsion of T=250 N.m and axial thrust of P=25kN. Show the combined state of stress on the surface element of the shaft.
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