An ion-exchange resin has a capacity of 1600 eq/m³. The manufacturer recom- mends that the resin be regenerated when 75 percent of its capacity has been utilized. The regeneration cycle takes I h for draining, regeneration, and flushing the bed. The contact time in the bed(s) is to be 10 min when one bed is out of service and one bed is being regenerated. The plant is to reduce the hardness of a flow of 7000 m³/day from 250 to 100 mg/L as CaCO3. Determine the total volume of resin required and the number of beds to be used. What is the frequency of regeneration which would be required?

An ion-exchange resin has a capacity of 1600 eq/m³. The manufacturer recom- mends that the resin be regenerated when 75 percent of its capacity has been utilized. The regeneration cycle takes I h for draining, regeneration, and flushing the bed. The contact time in the bed(s) is to be 10 min when one bed is out of service and one bed is being regenerated. The plant is to reduce the hardness of a flow of 7000 m³/day from 250 to 100 mg/L as CaCO3. Determine the total volume of resin required and the number of beds to be used. What is the frequency of regeneration which would be required?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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1. A commercial laundry is consdiering constucing an ion exchange process to remove hardness from water used in laundering oerpations. The laundry uses 1000 m/d of city water with Ca2+ at 4.5 meq/L and Mg2* at 2 meq/L. Their goal is to reduce total hardness (TH) to 1 meq/L. The softening resin has a TH capacity of 60 kg-TH/m of media with a recommended hydraulic loading rate of 0.4 m/(m2 min). Renegeration can be accomplihsed using 100 kg NaCl per m of ion exchange media in a 15% solution at a hydraulic loading rate of 0.04 m/(m² min). The exchanger tanks available to the laundrey have a diamter of 1 m. 1. What is the total bypass-water flow rate (m/d)? 2. What is the total daily resin volume required to soften the water (m³/d)? 3. How many exchanger tanks are required for a one-day operation cycle? 4. What is the resin bed depth (m) in each exchanger tank? 5. What is the daily volume of NaCl regenation solution used per tank (m/d)? 6. What is the time period required for resin…
1. A commercial laundry is consdiering constucing an ion exchange process to remove hardness from water used in laundering oerpations. The laundry uses 1000 m³/d of city water with Ca²+ at 4.5 meq/L and Mg²* at 2 meq/L. Their goal is to reduce total hardness (TH) to 1 meq/L. The softening resin has a TH capacity of 60 kg-TH/m³ of media with a recommended hydraulic loading rate of 0.4 m³/(m² min). Renegeration can be accomplihsed using 100 kg NaCl per m³ of ion exchange media in a 15% solution at a hydraulic loading rate of 0.04 m³/(m² min). The exchanger tanks available to the laundrey have a diamter of 1 m. What is the total bypass-water flow rate (m³/d)? What is the total daily resin volume required to soften the water (m³/d)? How many exchanger tanks are required for a one-day operation cycle? What is the resin bed depth (m) in each exchanger tank? What is the daily volume of NaCl regenation solution used per tank (m³/d)? What is the time period required for resin regeneration in…
6. A commeIcial laundry is considering constructing an ion exchange process to remove hardness from the water. The flow required is 1000 m/day and they use city water which contains 200 mg/1 as CaCO3 of calcrum and 100 mg/1 as CaCO3 of magnesium. Total hardness should be reduced to 80 mg/1 as CaCO3. The resin has a Total Hardness (TH) capacity of 60 kg TH/m' of media and the recommended hydraulic loading rate is 0.5 m/min-m2. (a) What is the water flow rate (m/d) that need to be treated ? (b) What is the total daily resin volume (m') required to soften the water? And (c) What is the area of exchanger bed needed.
7. A commercial laundry is considering constructing an ion exchange process to remove hardness from the water. The flow required is 1000 m/day and they use city water which contains 200 mg/l as CaCO3 of calcium and 100 mg/l as CACO3 of magnesium. Total hardness should be reduced to 80 mg/l as CaCO3. The resin has a Total Hardness (TH) capacity of 60 kg TH/m³ of media and the recommended hydraulic loading rate is 0.5 m/min-m2. (a) What is the water flow rate (m/d) that need to be treated ? (b) What is the total daily resin volume (m') required to soften the water? And (c) What is the area of exchanger bed needed.
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