Operation performance and granule characterization of upflow anaerobic sludge blanket (UASB) reactor treating wastewater with starch as the sole carbon source

Xueqin Lu, Guangyin Zhen, Adriana Ledezma Estrada, Mo Chen, Jialing Ni, Toshimasa Hojo, Kengo Kubota, Yu You Li

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Long-term performance of a lab-scale UASB reactor treating starch wastewater was investigated under different hydraulic retention times (HRT). Successful start-up could be achieved after 15days' operation. The optimal HRT was 6h with organic loading rate (OLR) 4g COD/Ld at COD concentration 1000 mg/L, attaining 81.1-98.7% total COD removal with methane production rate of 0.33L CH4/g CODremoved. Specific methane activity tests demonstrated that methane formation via H2-CO2 and acetate were the principal degradation pathways. Vertical characterizations revealed that main reactions including starch hydrolysis, acidification and methanogenesis occurred at the lower part of reactor ("main reaction zone"); comparatively, at the up converting acetate into methane predominated ("substrate-shortage zone"). Further reducing HRT to 3h caused volatile fatty acids accumulation, sludge floating and performance deterioration. Sludge floating was ascribed to the excess polysaccharides in extracellular polymeric substances (EPS). More efforts are required to overcome sludge floating-related issues.

Original languageEnglish
Pages (from-to)264-273
Number of pages10
JournalBioresource Technology
Volume180
DOIs
Publication statusPublished - 2015 Mar 1

Keywords

  • Extracellular polymeric substances (EPS)
  • Granular sludge
  • Methane
  • Starch
  • Upflow anaerobic sludge blanket (UASB)

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Operation performance and granule characterization of upflow anaerobic sludge blanket (UASB) reactor treating wastewater with starch as the sole carbon source'. Together they form a unique fingerprint.

  • Cite this