Feasibility study of a pilot-scale sewage treatment system combining an up-flow anaerobic sludge blanket (UASB) and an aerated fixed bed (AFB) reactor at ambient temperature

Haruhiko Sumino, Masanobu Takahashi, Takashi Yamaguchi, Kenichi Abe, Nobuo Araki, Shinichi Yamazaki, Satoshi Shimozaki, Akihiro Nagano, Naomichi Nishio

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

A feasibility test of a 17 m3-pilot-scale sewage treatment system was carried out by continuous feeding of raw municipal sewage under ambient temperature conditions. The system consisted of a UASB and an aerated fixed bed reactor. Some of the effluent from the fixed bed reactor was returned to the UASB influent in order to provide a sulfate source. The total BOD of 148-162 mg l-1 in the influent was reduced to a more desirable 11-25 mg l-1 in the final effluent. The levels of methane-producing activity from acetate and H2/CO2 gas at 10 °C were only 2% and 0% of those at 35 °C, respectively. On the other hand, the sulfate-reducing activity levels of the UASB sludge were relatively high at 10 °C, for example, 18% for acetate and 9% for H2/CO2 gas, compared to the activity levels at 35 °C. Therefore, BOD oxidization by sulfate reduction in the UASB was greater than that by methane production under low temperature conditions. This sulfate-reducing activity tended to be proportional to the copy number of adenosine-5′-phosphosulfate (APS) reductase genes in DNA extracted from the sludge.

Original languageEnglish
Pages (from-to)177-182
Number of pages6
JournalBioresource Technology
Volume98
Issue number1
DOIs
Publication statusPublished - 2007 Jan
Externally publishedYes

Keywords

  • Aerated fixed bed
  • Domestic sewage
  • Pilot-scale UASB
  • Sulfate-reducing activity
  • apsA gene

ASJC Scopus subject areas

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

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