TY - JOUR
T1 - Raw hematite based Fe(III) bio-reduction process for humified landfill leachate treatment
AU - Li, Rui
AU - Jiang, Yu
AU - Xi, Beidou
AU - Li, Mingxiao
AU - Meng, Xiaoguang
AU - Feng, Chuanping
AU - Mao, Xuhui
AU - Liu, Hongliang
AU - Jiang, Yonghai
N1 - Publisher Copyright:
© 2018
PY - 2018/8/5
Y1 - 2018/8/5
N2 - Microorganisms from paddy soils and raw hematite are used for enhancing natural Fe(III) bio-reduction, in order to remove macromolecular organic pollutants from humified landfill leachate. Based on batch experiments, 60% of refractory organics can be adsorbed by hematite in 12 days. In the presence of Fe(III)-reducing bacteria, 489.60 ± 0.14 mg L −1 of dissolved organic matters can be degraded to 51.90 ± 3.96 mg L −1 within 50 days; twelve types of semi volatile organic compounds can be degraded; hereby, the reaction follows a first-order kinetics. Crystalline Fe(III) is transformed into the amorphous form and reduced to Fe(II), hydroquinone functional groups in the humic acid (HA) are transformed to quinone ones, and the formation of HA-hematite ligands is promoted. Comparing with most of the studies about electron shuttling of HA, the transformation of quinone in the HA to hydroquinone could not be observed in the present bio-system. Based on column evaluations, more than 93% of chemical oxygen demand (influent concentration of 658 ± 19 mg L −1 ) could be removed microbially under flow conditions, when the hydraulic retention time was 45 h. Raw hematite-based Fe(III) bio-reduction has a promising potential for the removal of humic and benzene series in humified landfill leachate.
AB - Microorganisms from paddy soils and raw hematite are used for enhancing natural Fe(III) bio-reduction, in order to remove macromolecular organic pollutants from humified landfill leachate. Based on batch experiments, 60% of refractory organics can be adsorbed by hematite in 12 days. In the presence of Fe(III)-reducing bacteria, 489.60 ± 0.14 mg L −1 of dissolved organic matters can be degraded to 51.90 ± 3.96 mg L −1 within 50 days; twelve types of semi volatile organic compounds can be degraded; hereby, the reaction follows a first-order kinetics. Crystalline Fe(III) is transformed into the amorphous form and reduced to Fe(II), hydroquinone functional groups in the humic acid (HA) are transformed to quinone ones, and the formation of HA-hematite ligands is promoted. Comparing with most of the studies about electron shuttling of HA, the transformation of quinone in the HA to hydroquinone could not be observed in the present bio-system. Based on column evaluations, more than 93% of chemical oxygen demand (influent concentration of 658 ± 19 mg L −1 ) could be removed microbially under flow conditions, when the hydraulic retention time was 45 h. Raw hematite-based Fe(III) bio-reduction has a promising potential for the removal of humic and benzene series in humified landfill leachate.
KW - Fe(III) bio-reduction
KW - Humified landfill leachate
KW - Microorganisms
KW - Paddy soil
KW - Raw hematite
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U2 - 10.1016/j.jhazmat.2018.05.002
DO - 10.1016/j.jhazmat.2018.05.002
M3 - Article
C2 - 29763796
AN - SCOPUS:85047070398
SN - 0304-3894
VL - 355
SP - 10
EP - 16
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -