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1. A well water with a total hardness of 10.76 ppm is to be used for a pharmaceutical industry, which requires finished water hardness to be 3 ppm. An ion exchange resin is selected requiring 0.3 pounds of salt per kilo-grain of hardness removed to regenerate. What is the salt usage for each regeneration if the system regenerated every 10 days? What size resin tanks (diameter, height) would be required for a duplex system with no redundancy?Assumptions:Limit water loading rate to 8 gpm/sfResin capacity is 20,000 grains per cubic foot of resin Grains per gallon: 17.1 = 1 mg/LWater production is 1.0 mgdResin void is 50%2. What is the annual power cost for a 10-mgd water plant using ozone for oxidation as well as disinfection at a rate of 5 mg/L? Assume the city gets a bulk power rate of ten cents per kilowatt hour. 3. A brackish water Reverse Osmosis (RO) system has one skid with 36 vessels each containing six membrane elements. The plant produces one million gallons per day of desalted water. Is the system within membrane manufacturer's warranty requirement of maximum flux rate of 14 gfd? What is the annual power cost of the RO system?
The bend lies in a horizontal plane, and water enters from the west and leaves toward the north. Assuming no drop in pressure, what is the magnitude and direction of the resultant force acting on the bend
A PVC pipe with a diameter of 30 inches will carry a flow of 20 cfs. the bottom slope is 0.005 and the roughness coefficient is 0.015. determine the normal depth, critical depth, velocity and the froude number.
Two towers A and B are located on flat ground and their bases have equal elevations above sea level. A person on tower A whose eye level is 26.0 ft above the ground can just see the top of tower B, which is 105 ft above the ground. How far apart a..
Vehicles begin to arrive at a toll booth at 850 am with an arrival rate of x(t) = 4.1 + .01t (with t in min and x(t) in veh /min.) The toll booth opens at 9am and processes vehicles at a rate of 12 per minute throughout the day. Assuming D/D/1 que..
A vapor-compression refrigeration system, using Refrigerant 134a as the working fluid, has evaporator and condenser pressure of 1.4 bar and 12 bar, respectively.
The emission rate of radon into the crawl space is reported to be 0.6 pCi/m^2-s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of radon is 1 pCi/L.
Consider an asset that costs $712,000 and is depreciated straight-line to zero over its eight-year tax life. The asset is to be used in a five-year project; at the end of the project, the asset can be sold for $184,000
A wheeled tractor with high-pressure tires and weighing 74,946 lb is pulled up a 5% slope at uniform speed. If the tension in the tow cable is 13,000 lb, what is the rolling resistance of the road
The slope of the channel So=.15% and the Manning n=.038. Estimate the depth y2=100m upstream of a section where the flow depth y1=2.2m Using a) the direct integration method and b) the standard step method.
An investor bought a tax-free provincial bond, at a cost of $1000 which will pay $50 interest each year for 20 years. The bond will mature in 20 years and return the original $1000.
Assuming uniformly decelerated motion, determine the velocity and acceleration of point C of the belt, (a) immediately before the power is turned off. (b) 9 s later.
A steel shaft with a diameter of 40mm and length of 1.1m transmits 60hp from an electric motor to a compressor. If the allowable shear stress is 50MPa and the allowable angle of twist is 1.5 degrees
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