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A Net Water Production Model for Ultrafiltration Including Flow Direction Reversal and Chemically Assisted Backwashing
Flow direction reversal (FDR) was proposed as a novel method to increase net water production (NWP) during cross‐flow ultrafiltration. The design of the pilot‐plant study allowed measurement of specific flux recovery after each chemically assisted backwash (BW) combined with FDR and after each FDR at the midpoint of each BW/FDR cycle. The percent recovery of specific flux was higher following FDR (55%) than combined BW and FDR (53%) at lower chemical dosages; however, the percent increase in specific flux recovery by FDR was much lower (20%) when the chemical dose was doubled. A mathematical model was developed to predict the NWP achieved by any combination of BW/FDR and FDR frequency. For example, the advantage of introducing FDR was demonstrated at the lower chlorine dose, whereby the percent increase in NWP by alternating 15‐minute intervals of BW/FDR with FDR over BW/FDR alone was 10% for 30‐minute BW/FDR intervals and 2% for 15‐minute BW/FDR intervals.
A Net Water Production Model for Ultrafiltration Including Flow Direction Reversal and Chemically Assisted Backwashing
Flow direction reversal (FDR) was proposed as a novel method to increase net water production (NWP) during cross‐flow ultrafiltration. The design of the pilot‐plant study allowed measurement of specific flux recovery after each chemically assisted backwash (BW) combined with FDR and after each FDR at the midpoint of each BW/FDR cycle. The percent recovery of specific flux was higher following FDR (55%) than combined BW and FDR (53%) at lower chemical dosages; however, the percent increase in specific flux recovery by FDR was much lower (20%) when the chemical dose was doubled. A mathematical model was developed to predict the NWP achieved by any combination of BW/FDR and FDR frequency. For example, the advantage of introducing FDR was demonstrated at the lower chlorine dose, whereby the percent increase in NWP by alternating 15‐minute intervals of BW/FDR with FDR over BW/FDR alone was 10% for 30‐minute BW/FDR intervals and 2% for 15‐minute BW/FDR intervals.
A Net Water Production Model for Ultrafiltration Including Flow Direction Reversal and Chemically Assisted Backwashing
Lautenschlager, Sandro R. (author) / DiGiano, Francis A. (author) / Schuler, Andrew J. (author) / Ferreira Filho, Sidney Seckler (author)
Water Environment Research ; 79 ; 877-886
2007-08-01
10 pages
Article (Journal)
Electronic Resource
English
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