Document Detail


Enhanced biological phosphorus removal from wastewater by biomass with different phosphorus contents, Part III: Anaerobic sources of reducing equivalents.
MedLine Citation:
PMID:  14704010     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Laboratory-scale sequencing batch reactors exhibiting enhanced biological phosphorus removal (EBPR) operated at different influent phosphorus/chemical oxygen demand (COD) ratios were analyzed to evaluate possible anaerobic sources of reducing equivalents. Assuming anaerobic glycogen degradation was the sole anaerobic reducing equivalent source, an anaerobic phase carbon balance showed that glycogen-accumulating metabolism (GAM)-dominated systems were nearly carbon-balanced, but that polyphosphate-accumulating metabolism (PAM)-dominated systems had end-anaerobic phase carbon deficits. An anaerobic-phase reducing equivalent balance showed a reducing equivalent excess for the GAM-dominated systems and a deficit for the PAM-dominated systems, suggesting that glycogen degradation was not the sole reducing equivalent source for PAM. Reducing equivalent balances showed that metabolic models including complete anaerobic tricarboxylic acid (TCA) cycle activity, partial TCA cycle activity, and the glyoxylate bypass could provide the reducing equivalents required in PAM. Metabolic precursors produced in glycolysis, the TCA cycle, or modified versions of the TCA cycle could allow anaerobic growth and account for the PAM carbon deficits. The importance of considering both PAM and GAM activity in evaluating EBPR metabolic models was illustrated.
Authors:
Andrew J Schuler; David Jenkins
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  75     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:    2003 Nov-Dec
Date Detail:
Created Date:  2004-01-05     Completed Date:  2004-04-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  512-22     Citation Subset:  IM    
Affiliation:
Department of Civil and Environmental Engineering, Duke University, Durham, North Carolina 27708, USA. aschuler@duke.edu
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MeSH Terms
Descriptor/Qualifier:
Anaerobiosis
Bacteria / metabolism*
Biological Transport, Active
Biomass
Bioreactors
Carbon / metabolism
Citric Acid Cycle
Glycogen / metabolism
Models, Biological*
Oxygen / metabolism
Phosphorus / analysis,  metabolism*
Polyphosphates / metabolism
Waste Disposal, Fluid
Water Purification / methods*
Chemical
Reg. No./Substance:
0/Polyphosphates; 7440-44-0/Carbon; 7723-14-0/Phosphorus; 7782-44-7/Oxygen; 9005-79-2/Glycogen

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


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