Low-strength wastewater treatment by a UASB reactor

Kripa Shankar Singh, Hideki Harada, T. Viraraghavan

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


This study describes the feasibility of anaerobic treatment of a low-strength (500 mg-COD/l) synthetic wastewater using a semi-pilot-scale upflow anaerobic sludge blanket (UASB) reactor. Under ambient temperature conditions (20-35°C) with a hydraulic retention time (HRT) of 3 h and corresponding organic loading of 4 kg-COD/m3-day, 90-92% COD and 94-96% BOD reductions were achieved. Methane production was found to be about 141 l/kg-COD removed at standard temperature and pressure (STP). Because of the presence of a high concentration of active granular sludge in the lower portion of the reactor, 80% reduction of COD occurred within the bed level. Morphological examination of the sludge showed that the granules contained diverse groups of microorganisms, where rod-type, Methanothrix-like, cells were dominant on the surface.

Original languageEnglish
Pages (from-to)187-194
Number of pages8
JournalBioresource Technology
Issue number3
Publication statusPublished - 1996 Mar


  • Anaerobic treatment
  • Hydraulic retention time
  • Low-strength wastewater
  • Methanogenic bacteria
  • Organic loading
  • Sulfate-reducing bacteria
  • UASB reactor

ASJC Scopus subject areas

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


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