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A chemical is added at the beginning of a water treatment plant at a dose of 750 lb/day. The water treatment plant provides water to a community of 200,000 people and the average water consumption in the city is 110 gallons per capita per day (gpcd). If 10% of the chemical remains following reactions (i.e., 90% of the added chemical reacts following addition), find the residual chemical concentration (in mg/L) and the amount of chemical that was required for the reaction (in mg/L).
Consider the design of wastewater treatment plant for a community wiyh average daily and peak hourly wastewater design flows of 2.0 mgd. The raw sewage has an average of 230 mg/l BOD5 and 260 mg/l of suspended solids.
Sewage flows through a 12" diameter pipeline then through an 18" diamenter pipeline. The flow is the same (unknown) value in each pipe, and the slope is the same (unknown) contant value for both pipes.
How many moles of aluminum do 5.2×1024 aluminum atoms represent?
An interesting application of the relative motion equations is the experimental determination of the speed at which rain falls. Say you perform an experiment in your car in which you park your car in the rain and measure the angle the falling rain..
A three span continuous beam has spans of 27, 30, and 27 feet. The beams support one-way slabs, 6 inches thick that span 20 feet center to center. Assume that the beams are 16 inches wide and 24 inches deep.
The heat exchanger consists of 12 m of copper tubing that is 2 cm in diameter with 19 return bends. The flow rate is 3 x 10-4 m3/s. Water enters at 20 C and exits at 80 C. The elevation difference between the entrance and the exit is 0.8 m.
If a 96-inch brick sewer (n = 0.015) is laid on a slope of 0.01% is set to be rehabilitated with GIPL (n = 0.01) that will need 2-inches all around it. How much more flow, in cfs will be attained with this project
Calculate the fraction of total atrazine that will be adsorbed to the soil given that the soil has an organic carbon content of 2.5%. The bulk density of the soil is 1.25 g/cm3; this means that each cubic centimeter of soil (soil plus water) conta..
A 30mm pipe X 460mm rectangular duct carries air. What size square conduit is needed to transport 4m cube per sec of water at a distance of 45m and head loss of of 1.08m.
Which of the following is not a basic systems engineering concept?a. Define need before function
Determine the purchasing power 3 years from now of an investment of $20,000 today. The investment is earning a market interest rate of 8%, and the inflation rate is 3%.
A discharge meter to be used in a 40 cm pipeline carrying oil (kinematic viscosity = 10-5 m2/s, density = 860 kg/m3) is to be calibrated by means of a model (1/4 scale) carrying water (T = 20°C and standard atmospheric pressure).
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