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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/sf
Resin capacity is 20,000 grains per cubic foot of resin
Grains per gallon: 17.1 = 1 mg/L
Water production is 1.0 mgd
Resin void is 50%
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A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
Processing begins when the lane reaches capacity, what is the uniform deterministic arrival rate if the vehicle queue is cleared in 35 minutes after vehicles begin to arrive (in veh/min.)?
Toxic and Hazardous waste: how are they treated, safety measures, regulations in USA about hazardous waste.
A regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
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