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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 clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope 1:1 is to drain water uniformly at a rate of 8 m^3/s to a distance ok 1 km. If the flow depth is not to exceed 1.2 m,
Critical review the decision making of a failed major construction/property project within the UK in the last ten years.
compute the maximum acceptable service load on an a36 steel plate tension member 14in.x12in. having a single line of
Calculate the stress in a No. 7 rebar subjected to a tensile load of 10,600 lb (in ksi).
If we apply a breaking system to a skateboard while the speed of the skateboard is 5Milies per hour, the rider average weights is 180bounds while his height is 170 cm. You can assume the distance as it is 50meters.
Suppose in 100 years energy consumption is still 330 Ej/yr, but coal supplies only 20 percent of total demand, natural gas supplies 30 percent, and oil 10 percent. The remaining 40 percent of demand is met by noncarbon-emitting sources.
A glass jar is heated in an oven and sealed when the air pressure is 103 kPa and the temperature is 105 C. Find the absolute, gage, and vacuum pressures in the jar when it cools to 20 C.
If, on 8/1/2019, 3-year municipal bonds with an AA- rating and a coupon rate of 6.50% (payable semiannually) are selling for $100.00, what would be the fair market value of the 300 Whittier bonds (not including the 8/1/2019 coupon payment)
A NCSU student turned on his/her 150 W fan inside his/her room, 4m * 6m * 6m, before going to class in the morning of a summer day, excepting to find his/her room cooler when he/she returns at night.
Assume the settling tank behaves like an ideal sedimentation tank, what percentage of removal should be expected for particles with a settling velocity of 0.002 m/sec
a circular drain pipe has a radius of 375 mm. it conveys water 30 ordmc from location 1 to location 2 between which
Assume to just using coal as an electric energy source. Take efficency as %50 for average power plant.If the carbondioxide level is 400 ppm by volume now, what will be the carbondioxide level 10 years later
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