TY - JOUR
T1 - Laboratory-scale bioreactors for soluble selenium removal from selenium refinery wastewater using anaerobic sludge
AU - Soda, Satoshi
AU - Kashiwa, Masami
AU - Kagami, Tsubasa
AU - Kuroda, Masashi
AU - Yamashita, Mitsuo
AU - Ike, Michihiko
N1 - Funding Information:
A part of this study was conducted as the Regional New Consortium Project which was entrusted by the Ministry of Economy, Trade and Industry, Japan (METI), the Kansai Bureau Economy, Trade and Industry (METI-KANSAI). This work was performed under the Cooperative Research Program of Institute for Joining and Welding Research Institute, Osaka University. We appreciate Mr. Hisamitsu Takahashi and Mr. Nobuo Iwasaki (Shinko Chemical Corp.) for providing wastewater samples, Mr. Toichiro Koyama (NET Corp.) for providing the biofringe acrylic biomass carrier, and Mr. Kenji Tohmoto and Dr. Hiroshi Nishikawa (Osaka University) for their helpful instructions for EDX analysis.
PY - 2011/9/15
Y1 - 2011/9/15
N2 - Laboratory-scale bioreactors were constructed to investigate their applicability for recovery of soluble selenium from industrial wastewater. Microbial reduction of soluble selenium into elemental selenium is the key reaction because, as a result of its insoluble characteristics, it can be removed easily from the aqueous phase. Wastewater of a selenium refinery plant showed extremely low pH (<1.0), high salinity (6-7%), and various selenium concentrations (mainly selenite, 13.2-74.0mgl-1). As preconditioning for microbial reduction, the wastewater pH and salinity were adjusted, respectively, to about 7.5 and 1.1%. Granular sludge of an up-flow anaerobic sludge blanket (UASB) reactor and suspended sludge of a sewage sludge digester were seeded respectively to a UASB-type reactor and a suspended sludge bed reactor. The 2.2-l bioreactors were operated at 30°C and hydraulic retention time of about 24h for preconditioned wastewater supplemented with ethanol as a carbon source. The removal of 1.5-3.5mgl-1 soluble selenium was only 60% in the swim-bed reactor. The selenium concentration in effluent of the UASB-type reactor dropped to less than the regulated amount of the effluent concentration of selenium of 0.1mgl-1 by day 15.
AB - Laboratory-scale bioreactors were constructed to investigate their applicability for recovery of soluble selenium from industrial wastewater. Microbial reduction of soluble selenium into elemental selenium is the key reaction because, as a result of its insoluble characteristics, it can be removed easily from the aqueous phase. Wastewater of a selenium refinery plant showed extremely low pH (<1.0), high salinity (6-7%), and various selenium concentrations (mainly selenite, 13.2-74.0mgl-1). As preconditioning for microbial reduction, the wastewater pH and salinity were adjusted, respectively, to about 7.5 and 1.1%. Granular sludge of an up-flow anaerobic sludge blanket (UASB) reactor and suspended sludge of a sewage sludge digester were seeded respectively to a UASB-type reactor and a suspended sludge bed reactor. The 2.2-l bioreactors were operated at 30°C and hydraulic retention time of about 24h for preconditioned wastewater supplemented with ethanol as a carbon source. The removal of 1.5-3.5mgl-1 soluble selenium was only 60% in the swim-bed reactor. The selenium concentration in effluent of the UASB-type reactor dropped to less than the regulated amount of the effluent concentration of selenium of 0.1mgl-1 by day 15.
KW - Anaerobic sludge
KW - Metal refinery wastewater
KW - Selenium
KW - UASB reactor
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U2 - 10.1016/j.desal.2011.06.031
DO - 10.1016/j.desal.2011.06.031
M3 - Article
AN - SCOPUS:80052344433
SN - 0011-9164
VL - 279
SP - 433
EP - 438
JO - Desalination
JF - Desalination
IS - 1-3
ER -