Characterization of the retained sludge in a down-flow hanging sponge (DHS) reactor with emphasis on its low excess sludge production

Takashi Onodera, Kengo Matsunaga, Kengo Kubota, Ryoko Taniguchi, Hideki Harada, Kazuaki Syutsubo, Tsutomu Okubo, Shigeki Uemura, Nobuo Araki, Masayoshi Yamada, Masahito Yamauchi, Takashi Yamaguchi

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Experiments to characterize retained sludge in a down-flow hanging sponge (DHS) reactor fed with upflow anaerobic sludge blanket (UASB) treated sewage under moderate conditions were conducted. Plenty of oxygen was supplied through the DHS reactor without aeration and the effluent qualities after the reactor were comparable to activated sludge processes. The average excess sludge production rate was 0.09g SS g-1 COD removed. The DHS reactor maintained a high sludge concentration of 26.9g VSS L-1 sponge, resulting in a low loading rate of 0.032g COD g-1 VSS day-1. The endogenous respiration rate of DHS sludge was comparable to previously reported aerobic sludges. The numbers of microfauna were one order of magnitude greater than those in activated sludge. The results indicated that low excess sludge production was attributable to the high sludge concentration, sufficient oxygen supply, adequate endogenous respiration rate, and a high density and diversity of microfauna.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalBioresource Technology
Volume136
DOIs
Publication statusPublished - 2013 May

Keywords

  • Down-flow hanging sponge (DHS)
  • Low excess sludge
  • Microfauna
  • Sewage

ASJC Scopus subject areas

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

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