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The following data were obtained for a plate-and-frame filter of total area A=500 sq cm. operating under a constant pressuredrop of 0.1 atm: Time t (min): 50 75 100 Volume of filtrate V (liter): 9.7 12.3 14.0 The filtrate is essentially water. the volume of the cake is 1/10 the volume of the filtrate passed. The resistance of the filtrate medium may be neglected.
a) Estimate the permeability k (darcies) of the cake
b) At a certain time t after start-up, the filter is shut down. There follows a cleaning time t_c, in which the accumulated cake is removed, the cloth is cleaned, and the filter is reassembled. This cyclical pattern of productive operation, followed by cleaning, etc., is continued indefinitely. If t_c= 30 min, what value of t will maximize the average volume of filtrate produced per unit time? (Hint: Your goal is to maximize the volume filtered V over time. However, time becomes now the sum of the filtering time (t) and the cleaning time (t_c), giving you V/(t+t_c) that would be maximized. You should also have an expression for V from part a)
c) What is the value (liter/min) of this maximum average volumetric flow rate of filtrate?
Air can be assumed as a di-atomic ideal gas. Find the final temperature and the amount of work ( in kW) required for air compression at a rate of 100 mol/s , from an initial condition of 1 bar an 25 C to 10 bar; for the following ways:
a poorly designed 100 ft long homogeneous barge runs on diesel fuel, the fuel is held in a 2' tall trapezoidal tank of the same length as the barge. and is located at the bottom of the barge hull.
The particle-size characteristics of a soil are given in this table. Draw the particle-size distribution curve. X-axis is Particle Size and Y-axis is Percent Finer Particle Size (mm): 0.425, 0.033, 0.018, 0.01, 0.0062, 0.0035, 0.0018, 0.001.
a= -10 (1/sec^2 ) x where x is the displacement of the mass in meters. If the initial position is -1 m and the initial velocity is +1 m/sec, find: (i) the velocity when x = 0 for the first time and (ii) the maximum and minimum values of x.
what should be the minimum radius of curvature p for the track at B so that the passengers do not experience a normal force greater than kmg?neglect the size of the car and passengers.Take k=4
Compute the maximum service (unfactored) concentrated live load that can be applied at 1ft from the free end of the cantilever. Use load and strength -reduction factors from ACI Code Sections 9.2 and 9.3. Also check As,min.
Water is flowing at a depth of 10 ft with a velocity of 10 ft/s in a channel of rectangular section. Find the depth and change in water surface elevation caused by a smooth upward step in the channel bottom of 1 ft.
Ethyl acetate is made from acetic acid and ethyl alcohol. Let x = pounds of acetic acid input, y=pounds of ethyl acohol input, and z = pounds of ethyl acetate output. The relationship of output to input is: z^2/(1.47x - z)(1.91y - z) = 3.9.
What is the concentration of MLVSS in the activated sludge (mg L-1)
To remove the solution containing metal from a part after plating the part is commonly rinsed with water. The rinse water is contaminated with metal and must be treated before discharge. The Shiny Metal Plating Co. The plating solution contains 85..
Solar cookers can be used in less developed countries for cooking and also for thermal disinfection of water. To disinfect water, the water must be heated to about 35 Celsius for 5 hours. Of course, it takes time to raise the temperature of the wa..
an equal-tangent sag vertical curve is designed with the PVC AT STation 109 + 00 and elevation 950 ft, the PVI at station 110 + 77 and elevation 947.34ft,and the low point at station 110 + 50 . Determine the design speed of the curve.
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