A novel and cost-effective sewage treatment system consisting of UASB pre-treatment and aerobic post-treatment units for developing countries

Izarul Machdar, Hideki Harada, Akiyoshi Ohashi, Yuji Sekiguchi, Hiroyuki Okui, Kyoko Ueki

Research output: Contribution to journalConference articlepeer-review

65 Citations (Scopus)

Abstract

A novel sewage treatment system was proposed, which consists of a UASB anaerobic pretreatment unit and the following DHS (downflow hanging sponge-cubes) aerobic post-treatment unit, as a low-cost and easy-maintenance process for developing countries. Over six months experiment by feeding sewage our proposed system achieved 94% of total-COD removal, 81% of soluble-COD removal, and nearly perfect SS removal and total-BOD removal at the overall HRT of 8.3 hr (7 hr in UASB and 1.3 hr in DHS unit). Moreover, the DHS reactor was capable of performing high (73-78%) nitrification. Our whole system requires neither external aeration input nor withdrawal of excess sludge.

Original languageEnglish
Pages (from-to)189-197
Number of pages9
JournalWater Science and Technology
Volume36
Issue number12
DOIs
Publication statusPublished - 1997 Dec 1
EventProceedings of the 1997 6th IAWQ Asia-Pacific Regional Conference, Asian Waterqual'97 - Seoul, South Korea
Duration: 1997 May 201997 May 23

Keywords

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

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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