title: Influence of the composition and removal characteristics of organic matter on heavy metal distribution in compost leachates.
abstract: Compost leachates were collected to investigate the influence of the composition and removal of volatile fatty acids (VFAs), humic-like substances (HSs), and dissolved organic nitrogen (DON) on heavy metal distribution during the leachate treatment process. The results showed that acetic and propionic acids accounted for 81.3 to 93.84% of VFAs, and that these acids were removed by the anaerobic-aerobic process. Humic- and fulvic-like substances were detected by excitation-emission matrix spectroscopy coupled with parallel factor analysis, and their content significantly decreased after the anaerobic and membrane treatments. DON in compost leachates ranged from 26.53 mg L(-1) to 919.46 mg L(-1), comprised of dissolved free amino acids and the protein-like matter bound to humic- and fulvic-like substances, and was removed by the aerobic process. Correlation analysis showed that Mn, Ni, and Pb were bound to VFAs and protein-, fulvic-, and humic-like substances in the leachates. Co was primarily bound to fulvic- and humic-like matter and inorganic sulfurs, whereas Cu, Zn, and Cd interacted with inorganic sulfur.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China, hexs82@126.com.
authors.forename: Xiao-Song
authors.initials: XS
authors.lastname: He
authors.forename: Bei-Dou
authors.initials: BD
authors.lastname: Xi
authors.forename: Dan
authors.initials: D
authors.lastname: Li
authors.forename: Xu-Jing
authors.initials: XJ
authors.lastname: Guo
authors.forename: Dong-Yu
authors.initials: DY
authors.lastname: Cui
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Pan
authors.forename: Yan
authors.initials: Y
authors.lastname: Ma
mesh_terms: D002681:China; D002849:Chromatography, Gas; D004785:Environmental Pollutants / Q000032:analysis*; D005163:Factor Analysis, Statistical; D005232:Fatty Acids, Volatile / Q000032:analysis; D005410:Flame Ionization; D006812:Humic Substances / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D018508:Water Purification / Q000379:methods
chemical_list: D004785:Environmental Pollutants; D005232:Fatty Acids, Volatile; D006812:Humic Substances; D019216:Metals, Heavy; D012987:Soil; D009584:Nitrogen