Treatment of dilute wastewater in a UASB reactor at a moderate temperature: Performance aspects

Lalit K. Agrawal, Hideki Harada, Hiroyuki Okui

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The treatability of dilute wastewater by a UASB reactor was evaluated. After being seeded with digested sewage sludge, a 110-l reactor was operated at 25 °C under continuous feeding with synthetic wastewater having a COD of 300 mg/l for over 700 d. The hydraulic retention time (HRT) was successfully decreased in steps to 9 h (0.73 kg COD/m3/d). Granules began to be observed after the reactor had been in operation for 9 months. At an HRT of 9 h, the following results were obtained: soluble and total COD removal, 81±5% and 73±7%, respectively; methane production, 212 Nl/kg COD removed and 153 Nl/kg COD added; substrate conversion, 0.24 kg COD removed/kg VSS/d.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalJournal of Fermentation and Bioengineering
Volume83
Issue number2
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • COD mass balance
  • UASB reactor
  • anaerobic process
  • developing countries
  • granule size distribution
  • sewage
  • sludge retention time
  • treatment performance

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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