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3. Calculate the SDI for the following samples. Determine if the water needs to be pretreatment before entering an RO system. Test run time, min 2599 10 20 Cumulative volume filtered, mL B 500 700 890 1150 A 315 575 905 1425

3. Calculate the SDI for the following samples. Determine if the water needs to be pretreatment before entering an RO system. Test run time, min 2599 10 20 Cumulative volume filtered, mL B 500 700 890 1150 A 315 575 905 1425

Structural Analysis
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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Number 3, B
Recovery rate F3 2. Using the data below, determine the recovery rate and rejection rate for the following RO system. Unit Water Item Feed flow Brine flow Permeate TDS Brine TDS $ Ca²+ HCO3 TDS pH F4 % 2 5 10 20 % 3. Calculate the SDI for the following samples. Determine if the water needs to be pretreatment before entering an RO system. Test run time, min m³/d g/m³ g/m³ m/s F5 4. Estimate the scaling potential for the RO-treated water samples, by applying LSI. Constituent Unit mg/L as CaCO3 mg/L as CaCO3 mg/L ^ 6 A 315 88 Cumulative volume filtered, mL B 500 700 890 1150 575 905 1425 A 4000 350 65 1500 F6 & 7 ASTOS 5 7 20 6.5 F7 Water * 86 8 F8 B 10000 9000 175 2850 B 10 12 25 7.8 F9
Transcribed Image Text:Recovery rate F3 2. Using the data below, determine the recovery rate and rejection rate for the following RO system. Unit Water Item Feed flow Brine flow Permeate TDS Brine TDS $ Ca²+ HCO3 TDS pH F4 % 2 5 10 20 % 3. Calculate the SDI for the following samples. Determine if the water needs to be pretreatment before entering an RO system. Test run time, min m³/d g/m³ g/m³ m/s F5 4. Estimate the scaling potential for the RO-treated water samples, by applying LSI. Constituent Unit mg/L as CaCO3 mg/L as CaCO3 mg/L ^ 6 A 315 88 Cumulative volume filtered, mL B 500 700 890 1150 575 905 1425 A 4000 350 65 1500 F6 & 7 ASTOS 5 7 20 6.5 F7 Water * 86 8 F8 B 10000 9000 175 2850 B 10 12 25 7.8 F9
Expert Solution
Step 1: Formula used:

To calculate the SDI, we use the following formula:

SDI = (1 - Ti / Tf) * 100 / Tt

where:

  • Ti is the initial time required to filter a fixed volume of water (in minutes)
  • Tf is the final time required to filter the same volume of water (in minutes)
  • Tt is the total test time (in minutes)

The SDI value is unitless and represents the percentage 

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