Document Detail

A net water production model for ultrafiltration including flow direction reversal and chemically assisted backwashing.
MedLine Citation:
PMID:  17824534     Owner:  NLM     Status:  MEDLINE    
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 ofBW/ 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.
Sandro R Lautenschlager; Francis A DiGiano; Andrew J Schuler; Sidney Seckler Filho Ferreira
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  79     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-09-10     Completed Date:  2007-10-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  877-86     Citation Subset:  IM    
Department of Civil Engineering, State University of Maringá, Maringá, Paraná, Brazil.
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MeSH Terms
Models, Theoretical
Pilot Projects
Ultrafiltration / methods*
Waste Disposal, Fluid / methods*
Water Purification / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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