Oxygen tolerance capacity of upflow anaerobic solid-state (UASS) with anaerobic filter (AF) system

Yao Meng, Carsten Jost, Jan Mumme, Kaijun Wang, Bernd Linke

Research output: Contribution to journalArticlepeer-review

Abstract

In order to investigate the oxygen tolerance capacity of upflow anaerobic solid-state (UASS) with anaerobic filter (AF) system, the effect of microaeration on thermophilic anaerobic digestion of maize straw was investigated under batch conditions and in the UASS with AF system. Aeration intensities of 0–431 mL O2 gvs-1 were conducted as pretreatment under batch conditions. Aeration pretreatment obviously enhanced anaerobic digestion and an aeration intensity of 431 mL O2 gvs-1 increased the methane yield by 82.2%. Aeration intensities of 0–355 mL O2 gvs-1 were conducted in the process liquor circulation of the UASS with AF system. Dissolved oxygen (DO) of UASS and AF reactors kept around 1.39±0.27 and 0.99±0.38 mg L-1, respectively. pH was relatively stable around 7.11±0.04. Volatile fatty acids (VFAs) and soluble chemical oxygen demand (SCOD) concentration in UASS reactor were higher than those in AF reactor. Methane yield of the whole system was almost stable at 85±7 mL gvs-1 as aeration intensity increased step by step. The UASS with AF system showed good oxygen tolerance capacity.
Original languageEnglish
Pages (from-to)200-206
JournalJournal of Environmental Sciences
Volume45
Early online date16 Feb 2016
DOIs
Publication statusPublished - Jul 2016

Keywords

  • Anaerobic digestion
  • Biogas reactor
  • STRAW
  • BIOENERGY

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