Development of a sixth-generation down-flow hanging sponge (DHS) reactor using rigid sponge media for post-treatment of UASB treating municipal sewage

Takashi Onodera, Madan Tandukar, Doni Sugiyana, Shigeki Uemura, Akiyoshi Ohashi, Hideki Harada

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

A sixth-generation down-flow hanging sponge reactor (DHS-G6), using rigid sponge media, was developed as a novel aerobic post-treatment unit for upflow anaerobic sludge blanket (UASB) treating municipal sewage. The rigid sponge media were manufactured by copolymerizing polyurethane with epoxy resin. The UASB and DHS system had a hydraulic retention time (HRT) of 10.6. h (8.6. h for UASB and 2. h for DHS) when operated at 10-28. °C. The system gave reasonable organic and nitrogen removal efficiencies. The final effluent had a total biochemical oxygen demand of only 12. mg/L and a total Kjeldahl nitrogen content of 6. mg/L. The DHS reactor gave particularly good nitrification performance, which was attributed to the new rigid sponge media. The sponge media helped to provide a sufficient HRT, and retained a high biomass concentration, extending the solids retention time. The DHS reactor maintained a high dissolved oxygen concentration under natural ventilation.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalBioresource Technology
Volume152
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • Down-flow hanging sponge
  • Packing material
  • Sewage treatment
  • Upflow anaerobic sludge blanket
  • Ventilation

ASJC Scopus subject areas

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

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