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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?
a freeway exit ramp has a single lane and consists entirely of a horizontal curve with a central angle of 90 degrees and a length of 628 ft. if the distance cleared from the centerline for sight distance is 19.4ft, what design speed was used
Show that the drinking water standard of 10 mg/L nitrate as nitrogen is equivalent to 45 mg/L nitrate. How is nitrate related to TN and TKN?
A piston-cylinder device contains 0.85 kg R-134a at 263K. The piston is free to move and has a mass of 12 kg and diameter of 25 cm. The atmospheric pressure is 98 kPa. Heat is added to the cylinder until the R-134 temperature = 10 o C.
A new machine will cost $25,000. The machine is expected to last 4 years and have no salvage value. If the interest rate is 12%, determine the return and the risk associated with the purchase.
Knowing that the modulus of rigidity is 77 GPa for the steel and 27 GPa for the aluminum, determine the largest angle through which end A can be rotated if the following allowable stresses are not be exceeded
The 800 mm diameter shaft is made of A-36 steel. If it is subjected to the uniform distributed torque of 5kN*m/m, determine the angle of twist of end A with respect to B.
After 5 seconds the force is continuous at the 50 N level. Determine the velocity of the cart at t=8 seconds and calculate t at which the cart velocity is zero.
The base line vector between the base and roving reciever is 8340m and has an accuracy of +/-(1to 2 cm +/-2ppm). What is the estimated uncertainty in the length of this vector
1.at what temperature does the first solid phase form?2.what is the composition of this solid phase?3.at what
i want to know how to draw bending moment diagram for this shape and the value of the moment in critical sections
A hydraulic jump is observed to occur in a channel with a mild slope at a flow rate of 20cfs/ft. If the depth before the jump is 1 ft, determine the depth after the jump.
The elevation of water in well A is 300m above sea level and well B is 350m above sea level. The wells are 45m apart. A dye test reveals that the specific discharge between the two wells is about 2.75m/day.
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