Document Detail


Uncoupled metabolism stimulated by chemical uncoupler and oxic-settling-anaerobic combined process to reduce excess sludge production.
MedLine Citation:
PMID:  16377849     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of three uncoupled metabolic systems (conventional activated sludge process with the addition of 3,3', 4',5-tetrachlorosalicylanilide [TCS], oxic-settling-anaerobic [OSA] process modified by insertion of a sludge-holding tank in the sludge return line, and TCS and OSA combined process) on reducing excess sludge production were studied. Compared with the control conventional activated sludge process, the most effective system was the combined process, which could reduce excess sludge production by 46.90%. The 180-d operation results confirmed that TCS is an effective chemical uncoupler in reducing the sludge yield but that it had an adverse effect on substrate removal capability, effluent nitrogen concentration, and sludge settleability. The OSA process decreased excess sludge production by only 26% but had less adverse effect on effluent quality and could improve sludge settleability. The effluent total phosphorous concentration of the three systems was slightly lower than of the control unit. Microbial populations were monitored by both microscopic and molecular biologic analysis method (polymerase chain reaction [PCR]-denaturing gradient gel electrophoresis [DGGE]). The presence of TCS caused metazoans to disappear and decreased the number and activity of protozoa. PCR amplification of 16S rRNA and sequent DGGE analysis found a shift in the diversity of the predominant species. The results imply that OSA combined with the chemical uncoupler process may effectively reduce excess sludge yield and not affect process performance significantly.
Authors:
Fen Xia Ye; Ying Li
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied biochemistry and biotechnology     Volume:  127     ISSN:  0273-2289     ISO Abbreviation:  Appl. Biochem. Biotechnol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-26     Completed Date:  2006-02-10     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8208561     Medline TA:  Appl Biochem Biotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  187-99     Citation Subset:  IM    
Affiliation:
Department of Chemical Engineering, Ningbo University of Technology, Cuibai Road, 20 Houhe Lane, Ningbo 315016, China. yefenxia@hotmail.com
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MeSH Terms
Descriptor/Qualifier:
Aerobiosis / drug effects
Animals
Bacteria, Anaerobic / growth & development*
Bioreactors*
Enzyme Inhibitors / pharmacology*
Eukaryota / growth & development
Oxidation-Reduction / drug effects
Salicylanilides / pharmacology*
Waste Disposal, Fluid*
Water Purification*
Chemical
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Salicylanilides; 1154-59-2/3,3',4',5-tetrachlorosalicylanilide

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


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