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Effect of pH on the production of bacterial polyhydroxyalkanoates by mixed cultures enriched under periodic feeding

Paper ID Volume ID Publish Year Pages File Format Full-Text
35676 45101 2010 10 PDF Available
Title
Effect of pH on the production of bacterial polyhydroxyalkanoates by mixed cultures enriched under periodic feeding
Abstract

This research investigated the effect of pH on polyhydroxyalkanoate (PHA) production by mixed cultures enriched in a sequencing batch reactor (SBR) starting from activated sludge. The enrichment was performed with a mixture of acetic (85% on COD basis) and propionic (15%) acid, at an organic load rate of 8.5 gCOD/L/day over the range of pH from 7.5 to 9.5.The enriched cultures were all able to store the copolymer poly(3-hydroxybutyrate/3-hydroxyvalerate). Higher polymer production rates and yields (389 mg PHA (as COD)/g non-polymer biomass (as COD)/h and 0.53 COD/COD, respectively) were observed when the pH in the SBR was controlled at 7.5, with Lampropedia hyalina as the dominant bacterial species of the microbial community.PHA composition was also strongly affected by the pH. Indeed, batch tests showed that hydroxyvalerate (HV) content in the copolymer increased with increasing pH up to about 48% (mol/mol) at pH 9.5. Interestingly, the possibility of enhancing the HV content was also verified by performing batch tests at a more alkaline pH value than that in the SBR. In conclusion, this paper suggests that pH control is a main tool to tune HV content in the PHA, regardless of the feed composition.

Keywords
pH; Polyhydroxyalkanoates (PHA); Storage; Sequencing batch reactor (SBR); Organic load rate (OLR); Denaturing gradient gel electrophoresis (DGGE)
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Effect of pH on the production of bacterial polyhydroxyalkanoates by mixed cultures enriched under periodic feeding
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 5, May 2010, Pages 714–723
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us