TY - JOUR
T1 - Chromium(VI) bioreduction and removal by Enterobacter sp. SL grown with waste molasses as carbon source
T2 - Impact of operational conditions
AU - Sun, Yan
AU - Lan, Jirong
AU - Du, Yaguang
AU - Guo, Li
AU - Du, Dongyun
AU - Chen, Shaohua
AU - Ye, Hengpeng
AU - Zhang, Tian C.
N1 - Publisher Copyright:
© 2019
PY - 2020/4
Y1 - 2020/4
N2 - A technology utilizes bacteria Enterobacter sp. SL grown in an anaerobic reactor with waste molasses as carbon source to bio-reduce hexavalent chromium [Cr(VI)] in wastewater and then remove total chromium has been developed. The performance was elucidated through different initial and operating experiments conditions, and the associated mechanism of Cr(VI) reduction was explained. Results show that Cr(VI) removal is 99.91% at 25 h in the anaerobic reactor initially containing bacteria of 5% (v/v), (NH4)2Fe(SO4)2·6H2O of 0.5 g·L−1, waste molasses of 2.5 g·L−1, Cr(VI) of 100 mg·L−1, pH of 6.0, and with the operational temperature of 45 °C. After 120 h reaction, Cr(total) removal reached 91.10%. The major reduction products [FeS, Cr2O3, Cr(OH)3, S0 granules] together with microbes was removed by sludge separation with Cr(VI) in the supernatant (0.027 mg·L−1) being much lower than that (not excess 0.2 mg·L−1) of Electroplating Pollutant Emission Standard.
AB - A technology utilizes bacteria Enterobacter sp. SL grown in an anaerobic reactor with waste molasses as carbon source to bio-reduce hexavalent chromium [Cr(VI)] in wastewater and then remove total chromium has been developed. The performance was elucidated through different initial and operating experiments conditions, and the associated mechanism of Cr(VI) reduction was explained. Results show that Cr(VI) removal is 99.91% at 25 h in the anaerobic reactor initially containing bacteria of 5% (v/v), (NH4)2Fe(SO4)2·6H2O of 0.5 g·L−1, waste molasses of 2.5 g·L−1, Cr(VI) of 100 mg·L−1, pH of 6.0, and with the operational temperature of 45 °C. After 120 h reaction, Cr(total) removal reached 91.10%. The major reduction products [FeS, Cr2O3, Cr(OH)3, S0 granules] together with microbes was removed by sludge separation with Cr(VI) in the supernatant (0.027 mg·L−1) being much lower than that (not excess 0.2 mg·L−1) of Electroplating Pollutant Emission Standard.
KW - Cr(VI)-containing wastewater
KW - Microbial reduction of chromium
KW - Oxidation-reduction reaction
KW - Sulfate-reducing bacteria
KW - Waste molasses
UR - http://www.scopus.com/inward/record.url?scp=85078561731&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85078561731&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2019.121974
DO - 10.1016/j.biortech.2019.121974
M3 - Article
C2 - 31981808
AN - SCOPUS:85078561731
SN - 0960-8524
VL - 302
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 121974
ER -