title: Performance of a pilot-scale sewage treatment: an up-flow anaerobic sludge blanket (UASB) and a down-flow hanging sponge (DHS) reactors combined system by sulfur-redox reaction process under low-temperature conditions.
abstract: Performance of a wastewater treatment system utilizing a sulfur-redox reaction of microbes was investigated using a pilot-scale reactor that was fed with actual sewage. The system consisted of an up-flow anaerobic sludge blanket (UASB) reactor and a down-flow hanging sponge (DHS) reactor with a recirculation line. Consequently, the total CODCr (465±147 mg L(-1); total BOD of 207±68 mg L(-1)) at the influent was reduced (70±14 mg L(-1); total BOD of 9±2 mg L(-1)) at the DHS effluent under the conditions of an overall hydraulic retention time of 12 h, a recirculation ratio of 2, and a low-sewage temperature of 7.0±2.8 °C. A microbial analysis revealed that sulfate-reducing bacteria contributed to the degradation of organic matter in the UASB reactor even in low temperatures. The utilized sulfur-redox reaction is applicable for low-strength wastewater treatment under low-temperature conditions.
authors.affiliation: Department of Environmental System Engineering, Nagaoka University of Technology, 1603-1, Kami-tomioka, Nagaoka, Niigata 940-2188, Japan. masanobu@vos.nagaokaut.ac.jp
authors.forename: Masanobu
authors.initials: M
authors.lastname: Takahashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kuramoto
authors.forename: Akihiro
authors.initials: A
authors.lastname: Nagano
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shimozaki
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Sumino
authors.forename: Nobuo
authors.initials: N
authors.lastname: Araki
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yamazaki
authors.forename: Shuji
authors.initials: S
authors.lastname: Kawakami
authors.forename: Hideki
authors.initials: H
authors.lastname: Harada
mesh_terms: D000693:Anaerobiosis; D001105:Archaea; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D003080:Cold Temperature; D008697:Methane / Q000378:metabolism; D010084:Oxidation-Reduction; D010865:Pilot Projects; D012621:Seasons; D012722:Sewage / Q000382:microbiology*; D013431:Sulfates / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism*; D013997:Time Factors; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D012722:Sewage; D013431:Sulfates; D013455:Sulfur; D008697:Methane