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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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.
Hardness 6.54 (a) A 10-mm-diameter Brinell hardness indenter O produced an indentation 2.50 mm in diameter in a steel alloy when a load of 1000 kg was used. Compute the HB of this material. (b) What will be the diameter of an indentation to yield a hardness of 300 HB when a 500-kg load is used?
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.
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(i) A 10-mm-diameter Brinell hardness indenter produced an indentation 2.50 mm in diameter in a steel alloy when a load of 1000 kg was used. Compute the HB of this material. (ii) What will be the diameter of an indentation to yield a hardness of 300 HB when a 500-kg load is used?