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Water Science & Technology Vol 53 No 6 pp 99–105 © IWA Publishing 2006
Low strength wastewater treatment under low temperature conditions by a novel sulfur redox action process
T. Yamaguchi*, Y. Bungo**, M. Takahashi***, H. Sumino****, A. Nagano*****, N. Araki******, T. Imai*******, S. Yamazaki******** and H. Harada*********
*Dept. of Civil Engineering, Kure College of Technology, 2-2-11, Aga-minami, Kure, Hiroshima, Japan, (E-mail: yamaguti@kure-nct.ac.jp)
**Dept. of Civil Engineering, Kure College of Technology, 2-2-11, Aga-minami, Kure, Hiroshima, Japan, (E-mail: yamaguti@kure-nct.ac.jp)
***Hiroshima Prefectural Institute of Industrial Science of Technology, 3-10-32, Kagamiyama, Higashi-hiroshima, Hiroshima, Japan, (E-mail: masanobu@sankaken.gr.jp)
****Dept. of Civil Engineering, Gifu College of Technology, 2236-2, Kami-makuwa, Motosu, Gifu, Japan, (E-mail: sumino@gifu-nct.ac.jp)
*****Environment System Division, Sanki Engineering Co. Ltd., 1-4-1, Yurakucho, Chiyoda, Tokyo, Japan, (E-mail: akihiro_nagano@eng.sanki.co.jp)
******Dept. of Civil Engineering, Nagaoka College of Technology, 888, Nishi-katagai, Nagaoka, Niigata, Japan, (E-mail: araki@nagaoka-ct.ac.jp)
*******Dept. of Civil Engineering, Nagaoka College of Technology, 888, Nishi-katagai, Nagaoka, Niigata, Japan, (E-mail: araki@nagaoka-ct.ac.jp)
********Dept. of Civil Engineering, Kochi College of Technology, 200-1, Monobe-otsu, Nangoku, Kochi, Japan, (E-mail: syama@ce.kochi-ct.ac.jp)
*********Dept. of Environmental System Engineering, Nagaoka University of Technology, 1603-1, Kami-tomioka, Nagaoka, Niigata, Japan, (E-mail: ecohara@vos.nagaokaut.ac.jp)
ABSTRACT
The objective of this research is to make a novel wastewater treatment process activated by a sulfur-redox cycle action of microbes in low temperature conditions. This action is carried out by sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB). The process was comprised of a UASB reactor as pre-treatment and an aerobic downflow hanging sponge (DHS) reactor as post-treatment. As the results of reactor operation, the whole process achieved that over 90% of CODcr removal efficiency, less than 30 mgCODcr/L (less than 15 mgBOD/L) of final effluent, at 12 h of HRT and at 8 °C of UASB reactor temperature. Acetobacterium sp. was detected as the predominant species by PCR-DGGE method targeting 16SrDNA with band excision and sequence analysis. In the UASB reactor, various species of sulfate-reducing bacterium, Desulfobulbus sp., Desulfovibrio sp., and Desulfomicrobium sp., were found by cloning analysis. In the DHS reactor, Tetracoccus sp. presented as dominant. The proposed sulfur-redox action process was considered as an applicable process for low strength wastewater treatment in low temperature conditions.
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