Combination of a UASB reactor and a curtain type DHS (downflow hanging sponge) reactor as a cost-effective sewage treatment system for developing countries

I. Machdar, Y. Sekiguchi, H. Sumino, A. Ohashi, H. Harada

Research output: Contribution to journalConference articlepeer-review

89 Citations (Scopus)

Abstract

The second generation of our originally proposed sewage treatment system, which consists of a UASB reactor as an anaerobic pre-treatment unit and curtain-type DHS (downflow hanging sponge) reactor as an aerobic post-treatment unit, was installed at a municipal sewage treatment site. A 550-day continuous experiment demonstrated that the whole combined system successfully achieved 94-97% of unfiltered-BOD removal, 81-84% of unfiltered-COD removal, and 63-79% of SS removal, at an overall HRT of 8 h (6 h for UASB and 2 h for DHS units). The combined system performed an excellent organic removal as well as a fairly efficient nitrification, i.e. 52-61% of ammonia-nitrogen removal. Our proposed combined system possesses prominent advantages: requiring neither external aeration input nor excess sludge withdrawal.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalWater Science and Technology
Volume42
Issue number3-4
Publication statusPublished - 2000 Nov 13
EventWater Quality Management in Asia (Asian Waterqual'99) - Taipei, Taiwan
Duration: 1999 Oct 181999 Oct 20

Keywords

  • Aerobic post-treatment
  • Appropriate technology
  • DHS reactor
  • Developing countries
  • Sewage treatment
  • UASB reactor

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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