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Consider again the proposed water treatment plant for a city of 100,000 people where the maximum daily water usage rate is 99 X 106 L/d. Determine (a) the number of kilograms of chlorine needed per day and (b) the capacity of the contact tank. You may assume that the chlorine demand is 1.0 mg/L and that the desired chlorine residual is 0.2 mg/L. Furthermore, you may assume that the minimum contact time should be 30 minutes.
(The contact time in water treatment plants is usually provided by a large storage chamber called a clear well or storage reservoir. The primary function of the clear well is to isolate the plant from the hourly fluctuation of municipal water demand, but it also serves the purpose of allowing sufficient time so that the concentration of free available chlorine will stabilize at the proper value before being pumped to users.)
Provided that the amplitude is sufficiently great, the human ear can respond to longitudinal waves over a range of frequencies from about 20 Hz to about 20000Hz. Compute the wavelength corresponding to these frequencies
Geometric design and construction of a new two-lane two-way road has been recently completed and now it is time for design pavement near Ballarat, Victoria.
A hydrologic structure (e.g. a dam or a dike) is said to be designed for the N-year flood if it has a capacity which will be exceeded only by a flood equal oto or greater than N-year flood.
A normally consolidated clay layer is 4 m thick (one way drainage). From the application of a given pressure, the total anticipated primary consolidation settlement will be 80mm. What is the average degree of consolidation for the clay layer.
A steel rod having a cross sectional area of 1/2in^2 and length of 600ft is suspended vertically. It supports a load of 5000 pounds at the lower end. If steel weighs 490 lb/ft^3 and E=30,000,000 psi, find the total elongation of the rod
You heat 250 ml of tap water from 10 degree celcius to 100 degree celcius in 2 minutes using a microwave oven operating at 2.5 GHz. a). What is the wavelength of this electromagnetic radiation
a concrete test cylinder is loaded with p= 100k (445 kn) and resulting shortening of 0.036" (0.0914 mm). determine the unit strain developed in the concrete.
What is the corresponding horizontal distance between the points - The slop distance 156.777 from one poin to another at rate of+1.5%
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.
The preliminary design for a wastewater treatment plant is being developed. The wastewater flow rate is 10,000 m3/day, and the BOD5 concentration is 200 mg/L. The plant discharge standard is 30 mg/L as BOD5.
An empty air tank has a volume of 0.024 m3. The compressor on the tank is run until the pressure gauge reads about 65 psi (or 22,500 Pa). Assuming the temperature of the tank is 25 C, find the density of the air and the weight of the air in the ta..
A 1400-ft-long sag vertical curve (equal tangent)has a PVC at station 115 + 00 and elevation 750 ft. The initial grade is -3.5% and the final grade is +6.5%. Determine the elevation and stationing of the low point, PVI, and PVT
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