Characterization of sludge properties for sewage treatment in a practical-scale down-flow hanging sponge reactor: Oxygen consumption and removal of organic matter, ammonium, and sulfur

Naoki Nomoto, Masashi Hatamoto, Muntjeer Ali, Komal Jayaswal, Akinori Iguchi, Tsutomu Okubo, Masanobu Takahashi, Kengo Kubota, Tadashi Tagawa, Shigeki Uemura, Takashi Yamaguchi, Hideki Harada

Research output: Contribution to journalArticle

Abstract

The characteristics of sludge retained in a down-flow hanging sponge reactor were investigated to provide a better understanding of the sewage treatment process in the reactor. The organic removal and sulfur oxidation conditions were found to differ between the first layer and the following three layers. It was found that 63% and 59% of the organic matter was removed in the first layer, even though the hydraulic retention time was only 0.2 h. It is thought that the organic removal resulted from aerobic and anaerobic biodegradation on the sponge medium. The sulfate concentration increased 1.5-1.9-fold in the first layer, with almost no subsequent change in the second to fourth layers. It was shown that oxidation of sulfide in the influent was completed in the first layer. The result of the oxygen uptake rate test with an ammonium nitrogen substrate suggested that the ammonium oxidation rate was affected by the condition of dissolved oxygen (DO) or oxidation-reduction potential (ORP).

Original languageEnglish
Pages (from-to)608-616
Number of pages9
JournalWater Science and Technology
Volume77
Issue number3
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Developing country
  • Down-flow hanging sponge
  • Retained sludge
  • Sewage treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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