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)?

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)?

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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PV laundry facility uses 1 m/min and wants to design an exchange process to remove hardness from the water. The municipal water that they use contains 80 mg/L of calcium and 36.6 mg/L of Magnesium. Total hardness should be reduced to 80 mg/L of CaCO3. The resin has a Total Hardness (TH) capacity of 60 kg TH/m³ of resin, and the recommended hydraulic loading rate is 0.5 m³/m².min. a) What is the water flow rate (m³/d) that needs to be treated? b) What is the total daily resin volume (m³) required to soften the water? c) What is the area of the exchanger needed?
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