Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 433-438 |
| Number of pages | 6 |
| Journal | Desalination |
| Volume | 279 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2011 Sep 15 |
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Keywords
- Anaerobic sludge
- Metal refinery wastewater
- Selenium
- UASB reactor
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Chemistry(all)
- Materials Science(all)
- Water Science and Technology
Cite this
Laboratory-scale bioreactors for soluble selenium removal from selenium refinery wastewater using anaerobic sludge. / Soda, Satoshi; Kashiwa, Masami; Kagami, Tsubasa; Kuroda, Masashi; Yamashita, Mitsuo; Ike, Michihiko.
In: Desalination, Vol. 279, No. 1-3, 15.09.2011, p. 433-438.Research output: Contribution to journal › Article
}
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
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
UR - http://www.scopus.com/inward/record.url?scp=80052344433&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80052344433&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2011.06.031
DO - 10.1016/j.desal.2011.06.031
M3 - Article
VL - 279
SP - 433
EP - 438
JO - Desalination
JF - Desalination
SN - 0011-9164
IS - 1-3
ER -