Effect of starch addition on the biological conversion and microbial community in a methanol-fed UASB reactor during long-term continuous operation

Takuro Kobayashi, Feng Yan, Shintaro Takahashi, Yu You Li

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The effect of starch addition on the microbial composition and the biological conversion was investigated using two upflow anaerobic sludge bracket (UASB) reactors treating methanolic wastewater: one reactor was operated with starch addition, and another reactor was operated without starch addition. Approximately 300days of operation were performed at 30kg COD/m 3/d, and then, the organic load of the reactors was gradually increased to 120kg COD/m 3/d. Successful operation was achieved at 30kg COD/m 3/d in both reactors; however, the methanol-fed reactor did not perform well at 120kg COD/m 3/d while the methanol-starch-fed reactor did. The granule analysis revealed the granule developed further only in the methanol-starch-fed reactor. The results of the microbial community analysis revealed more Methanosaeta cells were present in the methanol-starch-fed reactor, suggesting the degradation of starch produced acetate as an intermediate, which stimulated the growth of Methanosaeta cells responsible for the extension of granules.

Original languageEnglish
Pages (from-to)7713-7719
Number of pages7
JournalBioresource Technology
Volume102
Issue number17
DOIs
Publication statusPublished - 2011 Sep

Keywords

  • Granulation
  • Methanol
  • Microbial community
  • Starch addition
  • UASB reactor

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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