Long-term performance evaluation of down-flow hanging sponge reactor regarding nitrification in a full-scale experiment in India

Takashi Onodera, Tsutomu Okubo, Shigeki Uemura, Takashi Yamaguchi, Akiyoshi Ohashi, Hideki Harada

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The first full-scale down-flow hanging sponge (DHS) reactor applied to post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor for the treatment of municipal sewage was evaluated, with emphasis on nitrification. The full-scale DHS reactor was successfully operated at a hydraulic retention time of 1.5h for over 1800days in India. The DHS reactor produced effluent with 6mgL-1 ammonium nitrogen, corresponding to 79% removal efficiency. The total nitrogen removal by the DHS reactor was 65%. The high process performance of the DHS reactor was supported by its distinctive characteristics of (1) high dissolved oxygen of 5.4mgL-1 in the DHS effluent without forced ventilation, (2) dense retained sludge in the range of 23-46gVSSLsponge-1, and (3) adequate sludge activity of 52mgNgVSS-1 day-1 for nitrification. The full-scale experiment has proven that the DHS reactor has practical applicability to developing countries.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalBioresource Technology
Volume204
DOIs
Publication statusPublished - 2016 Mar 1

Keywords

  • Developing countries
  • Down-flow hanging sponge
  • Full-scale experiment
  • Municipal sewage
  • Nitrification

ASJC Scopus subject areas

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

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