Effect of influent COD/SO42- ratios on biodegradation behaviors of starch wastewater in an upflow anaerobic sludge blanket (UASB) reactor

Xueqin Lu, Guangyin Zhen, Jialing Ni, Toshimasa Hojo, Kengo Kubota, Yu You Li

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A lab-scale upflow anaerobic sludge blanket (UASB) has been run for 250 days to investigate the influence of influent COD/SO42- ratios on the biodegradation behavior of starch wastewater and process performance. Stepwise decreasing COD/SO42- ratio enhanced sulfidogenesis, complicating starch degradation routes and improving process stability. The reactor exhibited satisfactory performance at a wide COD/SO42- range ≥2, attaining stable biogas production of 1.15-1.17 L L-1 d-1 with efficient simultaneous removal of total COD (73.5-80.3%) and sulfate (82.6 ± 6.4%). Adding sulfate favored sulfidogenesis process and diversified microbial community, invoking hydrolysis-acidification of starch and propionate degradation and subsequent acetoclastic methanogenesis; whereas excessively enhanced sulfidogenesis (COD/SO42- ratios <2) would suppress methanogenesis through electrons competition and sulfide inhibition, deteriorating methane conversion. This research in-depth elucidated the role of sulfidogenesis in bioenergy recovery and sulfate removal, advancing the applications of UASB technology in water industry from basic science.

Original languageEnglish
Pages (from-to)175-183
Number of pages9
JournalBioresource Technology
Volume214
DOIs
Publication statusPublished - 2016 Aug 1

Keywords

  • Energy conversion
  • Methane
  • Starch
  • Sulfate reduction
  • Upflow anaerobic sludge blanket (UASB)

ASJC Scopus subject areas

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

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