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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Concept explainers

Analysis and Procedures for Material Selection

The term material selection means to select the right material for various engineering applications. There are various engineering materials available and each has different individual properties. Thorough knowledge of the material properties and behavior is crucial in the design process. For instance, a structural member, such as a beam, is used to support vertical shear loads by the building itself. To withstand such loads, the material of the beam must possess adequate strength and stiffness to resist any deformation that might lead to the formation of cracks.

Question

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 any single tank (min)?

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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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