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1. Estimate the particle removal efficiency in a rectangular sedimentation tank with a depth of 4 m, width of 8 m, length of 40 m and process flow rate of 800 m3/h. For the following influent particle settling characteristics compute the overall removal efficiency. Plot the influent and effluent particle concentrations as a function of particle size using histogram. One way to increase the particle removal efficiency is to decrease the overflow rate. How do you propose to do this at the above treatment plant? If the overflow rate is reduced to 2.0 and 1.5 m/h, what are the corresponding particle removal efficiencies?
2. a. As filter bed collects impurities, the increase in the lead loss is directly proportional to the amount of impurities collected. With a uniform quality of feed water, the head loss, hL in a filter can be written as:
hL =Vs(a+bV)
where,
Vs - approach velocity of the water (m/s)
V - volume of water filtered through unit area of filter bed since the last backwash (m3/m2)
a, b- constants depending on the size and shape of the filter material and the quality of the applied water; units of and b are s and s/m A filter has a head loss of 0.3 m when newly washed, and 1.3 m after 24 hours. When operating at a rate of 1.5 L/s.m2. Estimate the head loss both immediately after backwash and 10 hours later, if the same water is applied at a rate of 2 L/s.m2.
Determine the deflection of a simple uniformly loaded beam by the Ritz method,using first one term, then two terms, adn finally three terms in a sine series. Why does the coefficient of sin2piex/L vanish?
The total flow then moves to a point W on the traction drive two metres off the ground, and travels through a nine millimetre diameter conduit. Ignoring all friction and minor losses, determine the pressures at points H and W.
The ship has a total weight of 155,000 tons, length = 1,600 feet and a beam = 150 feet (assume that it is the shape of a rectangular box). Calculate the height above the waterline of its center of Gravity (G).
A rectangular clarifier with a length:width ratio of 3:1 receives a flow of 850m3/day. the clarifiers depth is 4.0m and the detention time of the water inthe clarifier is 2.4 hrs, what are the surface overflow rate and the horizontal flow through ..
Two particles start from the same point along the same straight line and at the same instant. The first particle travels with a constant velocity v and the second with a constant acceleration.
Draw the shearing force diagram and the moment diagram of the following problem. The beam is indeterminate. You need to integrate the moment twice to get a formula for the deflection v(x).
The circular top of a can has a radius of .0320m. the pull-tab has an area of 3.8x10^-4 m^2. The absolute pressure of the carbon dioxide in the can is 1.40x10^5Pa. find the force that these gas generates on the top of a can?
How appropriate might a just in time inventory system be for a product such as roller skates?
The elastic ball bounces down a flight of rigid stairs. Determine the height h of the steps if all the trajectories between successive steps are identical. Use e = 0.85 and the initial velocity 6 m/s.neglect friction. (Theta=70 degrees)
Find the time for one complete cycle of this motion if the spring constant is 21 N/m. (Assume that once the pendulum ball hits the spring there is no effect due to the vertical movement of the ball.)
Use the bisection method to find the root of the equation f(x) = x 2 - 4sin(x) = 0. For initial bracketing interval [a,b] , take a=1 and b = 3.
Using the USLE, estimate the annual erosion from a 100 ha. forested watershed assuming the following: R =112 tonnes/ha/year. The forest is in fair condition with 40% cover; Average slope is 3%; The soils are clay loam in hydrologic group C.
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