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

doi:10.1016/j.biortech.2013.10.106

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

Bioresour Technol. 2014:152:93-100. doi: 10.1016/j.biortech.2013.10.106. Epub 2013 Nov 7.

Authors

Takashi Onodera¹, Madan Tandukar², Doni Sugiyana³, Shigeki Uemura⁴, Akiyoshi Ohashi⁵, Hideki Harada⁶

Affiliations

¹ Department of Civil and Environmental Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan; Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan. Electronic address: onodera.takashi@nies.go.jp.
² Department of Civil and Environmental Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
³ Department of Civil and Environmental Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan.
⁴ Department of Civil Engineering, Kisarazu National College of Technology, 2-11-1 Kiyomidaihigashi, Kisarazu, Chiba 292-0041, Japan.
⁵ Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan.
⁶ Department of Civil and Environmental Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan. Electronic address: harada@epl1.civil.tohoku.ac.jp.

PMID: 24291312
DOI: 10.1016/j.biortech.2013.10.106

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.

Keywords: Down-flow hanging sponge; Packing material; Sewage treatment; Upflow anaerobic sludge blanket; Ventilation.

MeSH terms

Absorption
Anaerobiosis
Biodegradation, Environmental
Biological Oxygen Demand Analysis
Biomass
Bioreactors*
Cities*
Nitrification
Nitrogen / analysis
Oxygen / analysis
Sewage / chemistry*
Temperature
Time Factors
Water Purification / instrumentation*
Water Quality

Substances

Sewage
Nitrogen
Oxygen