Production of polyhydroxyalkanoates and enrichment of associated microbes in bioreactors fed with rice winery wastewater at various organic loading rates

Fang Fang*, Run Ze Xu, Yan Qiu Huang, Su Na Wang, Lu Lu Zhang, Jin Yun Dong, Wen Ming Xie, Xueming Chen, Jia Shun Cao

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This study aimed to explore the production of polyhydroxyalkanoates (PHA) and selection of PHA-accumulating microorganisms in bioreactors fed with rice winery wastewater at various organic loading rates (OLRs). The substrate utilization, sludge properties, PHA synthesis and microbial community structure of three sequencing batch reactors were monitored. The results show the highest PHA yield (0.23 g/g) was achieved in one of the three reactors with an OLR of 2.4 g COD/L/d, in which Zoogloea was the most dominant PHA-accumulating microorganism. To quantify the PHA production and track the population changing profiles of the PHA-accumulating microorganisms in the long-term reactor operation, the Activated Sludge Model No. 3 was modified with two different heterotrophic microorganisms responding differently with the same substrate. The modeling results indicate that a moderate OLR (>2.4 gCOD/L/d) was beneficial for PHA production. The results are useful for understanding the PHA production from industrial wastewaters and selection of PHA-accumulating microorganisms.
Original languageEnglish
Article number121978
JournalBioresource Technology
Volume292
Number of pages9
ISSN0960-8524
DOIs
Publication statusPublished - 2019

Keywords

  • Mathematical model
  • Microbial enrichment
  • Organic loading rate (OLR)
  • Polyhydroxyalkanoates (PHA)
  • Rice winery wastewater

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