Document Detail

Effect of high nitrate concentration on PHB storage in sequencing batch reactor under anoxic conditions.
MedLine Citation:
PMID:  18842401     Owner:  NLM     Status:  MEDLINE    
The study investigated effect of high influent nitrate concentration on poly-beta-hydroxybutyrate, (PHB), storage in a sequencing batch reactor, (SBR), under anoxic conditions. Acetate was fed as pulse during anoxic phase, sustained with external nitrate feeding. SBR operation involved three runs at steady state with COD/N ratios of 3.84, 2.93 and 1.54 gCOD/gN, where external nitrate concentrations gradually increased from 50 mg N/l to 114 mg N/l and 226 mg N/l, in 1st, 2nd and 3rd runs, respectively. In 1st run, acetate was fully converted into PHB with the storage yield value of 0.57-0.59 gCOD/gCOD, calculated both in terms of PHB formation and NO(X) utilization, confirming storage was the sole substrate utilization mechanism. In the following runs, PHB formation was reduced and the storage yield based on PHB dropped down to 0.40 and 0.33 gCOD/gCOD with increasing influent nitrate concentrations, indicating that higher portions of acetate were diverted to simultaneous direct growth. The observations suggested that nitrite accumulation detected at low COD/N ratios was responsible for inhibition of PHB storage.
Asli S Ciğgin; Ozlem Karahan; Derin Orhon
Publication Detail:
Type:  Journal Article     Date:  2008-10-07
Journal Detail:
Title:  Bioresource technology     Volume:  100     ISSN:  1873-2976     ISO Abbreviation:  Bioresour. Technol.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2008-11-12     Completed Date:  2008-12-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1376-82     Citation Subset:  IM    
Environmental Engineering Department, Faculty of Civil Engineering, Istanbul Technical University, Maslak, Istanbul, Turkey.
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MeSH Terms
Acetates / metabolism*
Bacteria, Anaerobic / metabolism*
Bioreactors / microbiology*
Drug Storage / methods
Hydroxybutyrates / chemistry*,  metabolism*
Nitrates / chemistry*,  metabolism*
Polyesters / chemistry*,  metabolism*
Reg. No./Substance:
0/Acetates; 0/Hydroxybutyrates; 0/Nitrates; 0/Polyesters; 26063-00-3/poly-beta-hydroxybutyrate

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

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