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Hydrogen sulfide (H2S) is an odorous gas that can be stripped from solution by gas stripping. The efficiency of the process will strongly depend on the pH of the solution. The equilibrium reaction is: in a pocess similar to ammonia. The reaction is H2S -><- (H+) + (HS-) with equilibrium constant (K_a1) = 0.86 * 10^-7 Find the fraction of H_2*S (ie: H_2*S/(H_2*S) + (HS-) at pH 6 and pH 8
A truck driver used sand to soak up a 1 g spill of lindane (C6H6Cl6). He placed the contaminated soil in an open drum which then filled with 150 L of water during a rainstorm. You test the water and find a concentration of 17 M/L.
A manometer of water reads a height of 20cm at a temperature of 15 degrees C. If the diameter of the manometer tube is 1mm, what is the static height reading
Determine the force required to lift the block of stone that weighs 200 lb. The rollers are frictionless and the static coefficient between all other surfaces is 0.3. Neglect the size and weight of the wedges.
Derive an equation that allows you to compute the diameter of the drain hole for a desired steady water height in the tank for the design condition inflow and pumping rates.
determine the dimensions of an ideal circular settling tank that can remove 0.01-in diameter particles with a specific gravity of 1.01. Use a detention time of 1.5 hours, flowrate= 4ft^3/sec, the specific weight of water=62.4 lb/ft^3
Should Bernard bid for the project assignment? Why or why not? Does Bernard have an unfair advantage over firms having designed the project on which he wants to bid?
A trapezoidal channel with a bottom width of 4 feet and side slopes 2:1 (H:V) and a bed slope of 1 percent conveys a discharge of 50,000 gpm. Assume n = 0.025. Compute the normal depth.
A 300 mm diameter pipe is placed in a 3 m deep rectangular trench that is 0.60 m wide. The trench is backfilled with clay that has a bulk unit weight of 18.8 kN/m3. Compute the dead load due to backfill that the pipe must support.
an insulated tank is evacuated. Air from the atmosphere at 12 psia and 70 degrees farenheight is allowed to flow into the 100 cubic foot tank. What is the final temp and the final mass of air in the tank just after flow ceases.
The National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time average over 40 hr). The CCl4 found in a sample is 4800 ppb. Does the sample meet the NIOSH standard
A concrete dam retaining water has a specific weight of concrete of 23.5kn/m3, what is the factor of safety against sliding & overturning and pressure intensity on the base if coefficient of friction is 0.45
compute normal and critical depths in a concrete culvert(n=0.015)with a diameter of 36in.and a bed slope of 0.002ft/ft if the design discharge is 15cfs.is the slope steep or mild?reap for S= 0.02ft/ft.
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