Effects of landfill refuse on the reductive dechlorination of pentachlorophenol and speciation transformation of heavy metals

Liu，Hong Bao1,2; Liu，Si Jia1,2,3; He，Xiao Song1,2; Dang，Fei4; Tang，Yuan Yuan5; Xi，Bei Dou1,2

2021-03-15

10.1016/j.scitotenv.2020.144122

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Landfill refuse is a mixture of inorganic minerals and organic matter that is capable of undergoing complexation and redox reactions due to its active functional groups. Organic matter often combines with minerals in landfill refuse and it remains unclear whether this combination involves electron transfer. Therefore, the effects of landfill refuse composition on reductive dechlorination and speciation transformation of heavy metals were investigated in this study. Results show that landfill refuse comprises protein- and humic-like substances, aliphatic structures, and a large number of hydroxyl, carboxyl, quinoid and other active functional group. The electron donating capacity (0.09–0.26 μmol/g(C)) of landfill refuse was found to be higher than its electron accepting capacity (0.03–0.23 μmol/g(C)), indicating that electron donating groups (hydroxyl) were the main redox-active moieties, facilitating the reductive dechlorination of pentachlorophenol (PCP) by microorganism. FeO, FeO and SiO were the main inorganic minerals affecting PCP dechlorination. The speciation distribution of heavy metals in landfill refuse was determined by the BCR sequential extraction method. Results showed that Zn and Ni have high potential migration capacity, poor stability and the highest bioavailability, while Cr, Cu and Pb are relatively stable and have weak migration potential. The oxygen- and nitrogen-containing functional groups, aliphatic structures and aromatic carbon in landfill refuse can promote the transformation of Ni and Cr from an unstable to stable state. Protein-like substances exhibit a strong Cu binding ability, allowing Cu to combine with organic matter more easily than other assessed heavy metals. Both FeO and FeO affected the stability of Cu. FeO promoted the stabilization of Zn, whereas FeO and SiO promoted Cu instability. These results could provide some references for the treatment of organic chlorides and the stabilization of heavy metals in landfill refuse in China.

Heavy metal Landfill refuse Pentachlorophenol Speciation transformation

EI ; SCI

英语

其他

Beijing Natural Science Foundation[8182057]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000607779400137

ELSEVIER

20205109659334

Nickel ; Electrons ; Extraction ; Phenols ; Silicon ; Soils ; Chlorine compounds ; Redox reactions ; Copper ; Stabilization ; Herbicides ; Land fill ; Silica ; Proteins

Municipal and Industrial Wastes; Waste Treatment and Disposal:452 ; Soils and Soil Mechanics:483.1 ; Metallurgy and Metallography:531 ; Copper:544.1 ; Nickel:548.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

2-s2.0-85097759481

Scopus

1.State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing,100012,China
2.State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences,Beijing,100012,China
3.School of Environment and Energy,South China University of Technology,Guangzhou,510006,China
4.Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing,210008,China
5.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Hong Bao,Liu，Si Jia,He，Xiao Song,et al. Effects of landfill refuse on the reductive dechlorination of pentachlorophenol and speciation transformation of heavy metals[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,760.

Liu，Hong Bao,Liu，Si Jia,He，Xiao Song,Dang，Fei,Tang，Yuan Yuan,&Xi，Bei Dou.(2021).Effects of landfill refuse on the reductive dechlorination of pentachlorophenol and speciation transformation of heavy metals.SCIENCE OF THE TOTAL ENVIRONMENT,760.

Liu，Hong Bao,et al."Effects of landfill refuse on the reductive dechlorination of pentachlorophenol and speciation transformation of heavy metals".SCIENCE OF THE TOTAL ENVIRONMENT 760(2021).