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Ozone is sometime used as a disinfectant for drinking water. Ozone is highly reactive it will react benign species found in water, as well as the pathogens it is intended to kill. It found that ozone reaction in water nearly follows first-order kinetics in ozone concentration, such as that its concentration decreases by 50 percent in 12 minutes (t1/2 = 12 min). A water supplier wants to inject ozone into a piper bringing water to the water treatment plant to predisinfect the influent. The 3.0-ft diameter piper is 3,400 feet long with a steady flow rate of 10,000 gal/min. what concentration of ozone (in mg/L) should be Injected at the head of the piper so what there will be an ozone concentration of 1.0mg/L at the piper's exit into the plant? The piper may be realistically assumed to act as an ideal PFR.
As an agronomist you have been approached by a large pepper farmer who wishes to determine an appropriate"yield goal" fot this season. He provides you with yield data for ten year period which indicates that his production has been slowly decreasi..
Average pore water pressure in fully saturated clay specimien, which was subjected to a pressure of 20N/cm^2 initially, was measured to be 7N/cm^2 after a period of time.
A 3000 lb vehicle has a drag coefficient of 0.32 and a frontal area of 30 ft2. What is the minimum tractive effort required for this vehicle to maintain a 65 mph speed on a 2% upgrade through an air density of 0.002045 slugs/ft3
Suppose an expert hypothesizes that the probability of a rainfall event causing a particular stormwater retention pond to overtop can be modeled with a beta (a, B ) distribution. Over n years of data collection, the percentages of rainfall events
Determine the maximum and minimum stress intensities in the section.
The slope distance between two points is 72.665 m, and the difference in elevation between the points is 1.120 m. Compute the horizontal distance.
A 24-in.-wide by 0.100-in.-thick by 140-in.-long steel sheet is to be formed into a hollow section by being bent through 360° and having the long edges welded (i.e., butt-welded) together. Assume a cross-sectional medial length of 24 in.
Determine the liquid detention time, loading rate, F/M ration (with an MLSS of 2350 mg/l), sludge age (with 5330 lb/day waste sludge Eff. SS= 20 mg/l. Will the sludge settle properly
Northern Tundra Telephone (NIT) has received a contract to install emergency phones along a new 100-mile section of the Snow-Moose Turnpike. Fifty emergency phone systems will be installed about 2 miles apart.
A sample of coarse aggregate weights 1072 grams when oven-dried, 1091 grams when saturated surface-dried, and 667.6 grams when submerged. Calculate the bulk specific gravity, apparent specific gravity, and percent absorption.
A 100 ft cut steel tape was used to measure between two property markers. The rear surveyor held 93 ft, while the head surveyor cut .67ft. What was the distance between the markers
A cast iron water main 14m long of 600 mm inside diameter and 30 mm wall thickness runs full of water and is supported at its ends. Calculate the maximum stress in the metal if density of cast iron is 7200 kg/m and that of water is 1000 kgm.
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