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El Dunque is a small community in Puerto Rico. They drink surface water from the rainforest. Right now they have a chlorination contact tank followed by a 3" diameter pipe that travels 1.5 miles until the first customer. Assume that t10of the tank is 40 minutes and that Q = 0.1 ft3/sec. How much chlorine would they save if they added a sand filter (direct filtration)? Assume that they must adhere to the EPA regulations of 3-log removal of Giardia and 4-log removal of viruses. Assume T = 20° C and pH =
6.5.
First calculate the amount of chlorine required at the end of the pipe without the sand filter.
Next calculate the amount of chlorine required at the end of the pipe if a sand filter (direct filtration) is installed.
Adding a sand filter allows a saving of how many lbs of chlorine per year?
Two L 127 x 76 x 12.7-mm structural steel angles are used for a column (Use appendix B of the text book for cross-sectional properties) are used for a pin-ended column that is 4 m long. Determine the compressive buckling load if: θ· The angles act..
The mass m, stiffness k, and natural frequency fn of an undamped SDF system are unknown. These properties are to be determined by harmonic excitation tests. at an excitation frequency of 4 Hz, the response tends to increase without bound.
material (LCY) in 12 yard dump trucks, placing it, and compacting the weight of the soil is 3,750 lb/cu.yd. (30 pts.) (show your calculations) a) Find the Swell and Shrinkage b) Load and Shrinkage Factors
In its natural condition a soil sample has a mass of 2400 g and a volume of 1.15 X 10-3 m3. After being completely dried in an oven the mass of the sample is 2225 g. The value of Gs for the soil is 2.7. Determine the:
For the beam and loading shown, 2) draw the shear and bending-moment diagrams, B) determine the maximum absolute values of the shear and bendnig moment.
There has been a significant growth in the use of engineered composites for various engineering applications because of their many advantages over traditional construction materials.
A vane, 10 cm long and 8 cm in diameter, was pressed into soft clay at the bottom of a bore hole. Torque was applied and gradually increased 45 N-m when failure took place. Subsequently the vane rotated rapidly so as to completely remould the soil. T..
A 10-feet trapezoidal channel is designed to carry a discharge of 1,000cfs with side slopes: Z1 = 4 and Z2 = 5. The channel bed slope is 0.04 ff/ft and has Manning's N of 0.03. To protect the channel from erosion
what is the procedure to design the beam and column?
Describe the equation for discharging a water tank. Use: H= 2m, A_s= 1m^2, density water= 1000kg/m^3, K = 1kg hr^-1 m^-1/2 Mass flow in = 0 and mass flow out given by, Mass flow out = K z^1/2.
an existing water treatment plant is producing an average flow of 0.5 mgd. due to several limitations the plant only
When a pesticide comes into contact with skin, a certain percentage of it is absorbed. The percentage of the pesticide that will be absorbed during a given tie period can be modeled with a lognormal distribution.
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