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Ferric chloride (FeCl3·7H2O) is used at a water treatment plant. The FeCl3·7H2O is dosed at 40 mg/L. The flow rate of the treatment plant is 2,000 m3/d. a. Calculate the mass of sodium bicarbonate (NaHCO3) that would be required per day to replace the alkalinity consumed. (Hint: NaHCO3 dissociates to Na+ and HCO3 -) b. Calculate the total mass of sludge dry solids generated per day.
determine the dimensions of an ideal circular settling tank that can remove 0.01-in diameter particles with a specific gravity of 1.01. Use a detention time of 1.5 hours, flowrate= 4ft^3/sec, the specific weight of water=62.4 lb/ft^3
You have two wires connected end to end. Wire 1 is copper and wire 2 is made using a special carbon conductor. Wire 1 has a resistance of 0.215 ohms/ft and is 500 ft long. Wire 2 has a resistance of 0.141 ohms/ft and is 700 ft long.
An air-filled rubber ball has a diameter of 6 in. If the air pressure within it is increased until the ball's diameter becomes 7 in., determine the average normal strain in rubber.
A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB= 1.25 in, tAB= 0.5 in, dBC= 2.25 in and tBC= .375 in respectively.
write computer code using Matlab that emoloyes the nelder and mead simplex method to solve the welded-beam design (benchmark problem
Using the method of lee et al. predict the temperature required in an isothermal plug flow incinerator to reduce the xylene level in a waste gas from 1000 ppm to 10ppm. Assume a residence time of 0.7 sec.
A train moving at 100 km/hr decreases its speed to 80 km/hr in 3.5 seconds. How far, in meters, did the train travel during this time
An airplane flies at a speed of 360 mph at an altitude of 5000 ft. If the boundary layers on the wing surfaces behave as those on a flat plate, estimate the extent of laminar boundary layer flow along the wing in feet.
Online professor's response to: Probability problems, A very rich investor has a small amount of spare cash which she wishes to invest. She has four options to choose from.
Given the total dissolved solids in a brine is 20,500 ppm, compute the resisitivity at a reservoir depth of 8,000 feet.
The frame is desinged to carry the hanging mass at G equal to 167 kg. The frame is supported by a pin connection at C and the rope AB, and constructed with pin connections at points E, F, and D.
As a project manager on site where work for 3 km long tunnel has been undertaken the site is remote and takes about 2 days to travel to nearest town supervisors technicians and skiled workers in dangerous work.
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