UASB performance and electron competition between methane-producing archaea and sulfate-reducing bacteria in treating sulfate-rich wastewater containing ethanol and acetate

Zhaoqian Jing, Yong Hu, Qigui Niu, Yo Ryu, Gyokuyu Ri, Xiaochang C. Wang

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

To find an appropriate method for sulfate-rich wastewater containing ethanol and acetate with COD/sulfate ratio of 1, a UASB reactor was operated for more than 180days. The influences of HRT (hydraulic retention time) and OLR (organic loading rate) on organics and sulfate removal, gas production, and electrons utilization were investigated. The sludge activity and microorganism composition were also determined. The results indicated that this system removed more than 80% of COD and 30% of sulfate with HRT above 6h and OLR below 12.3gCOD/Ld. Further HRT decrease caused volatile fatty acids accumulation and performance deterioration. Except at HRT of 2h, COD and electron flow were mostly utilized by methane-producing archaea (MPA), and methane yield remained in the range of 0.18-0.24LCH4/gCOD. Methane was mainly generated by Methanosaeta concilii GP6 with acetate as substrate, whereas sulfate was mainly reduced by incomplete-oxidizing Desulfovibrio species with ethanol as substrate.

Original languageEnglish
Pages (from-to)349-357
Number of pages9
JournalBioresource Technology
Volume137
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Desulfovibrio
  • Electron competition
  • Methane yield
  • Methanosaeta
  • UASB

ASJC Scopus subject areas

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

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