Question: 1. A commercial laundry is considering constructing an ion exchange process to remove hardness from water used in laundering operations. The laundry uses 1000 m
1. A commercial laundry is considering constructing an ion exchange process to remove hardness from water used in laundering operations. 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). Regeneration can be accomplished 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 laundry have a diameter 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 regeneration solution used per tank (m3/d)?
* What is the time period required for resin regeneration in any single tank (min)?
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