Insight into the composition and degradation potential of dissolved organic matter with different hydrophobicity in landfill leachates.
Dissolved organic matter (DOM) isolated from the leachates with different landfill ages was fractionated into hydrophobic acid (HOA), hydrophobic neutral (HON), hydrophobic base (HOB) fractions and hydrophilic matter (HIM) based on hydrophobicity, and the composition and degradation potential of the bulk DOM and its fractions were investigated by excitation-emission matrix fluorescence spectra coupled with parallel factor analysis. Results showed that the bulk DOM comprised fulvic-, humic-, tryptophan- and tyrosine-like substances, as well as component C1, whose composition and origin was unidentified. Landfill process increased the content of component C1, fulvic- and humic-like matter. The HON fractions comprised primarily component C1 and tyrosine-like matter. The HOA, HOB and HIM fractions isolated from the young leachates consisted mainly of tryptophan- and tyrosine-like substances. As to the intermediate and old leachates, the HOA and HOB fractions comprised mainly component C1, while the HIM comprised mainly fulvic-like matter. The HIM showed the most resistant against biodegradation among the four fractions, and was the main component of leachate treatment. Advanced oxidation and/or membrane treatment are recommended to remove the HIM fraction due to its hydrophilic and stable characteristics.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Xiao-Song
XS
He
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: xibeidou@126.com.
Bei-Dou
BD
Xi
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Ru-Tai
RT
Gao
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Hui
H
Zhang
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Qiu-Ling
QL
Dang
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Dan
D
Li
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Cai-Hong
CH
Huang
D001578:Benzopyrans / Q000032:analysis; D001673:Biodegradation, Environmental; D006812:Humic Substances / Q000032:analysis; D057927:Hydrophobic and Hydrophilic Interactions; D014364:Tryptophan / Q000032:analysis; D014443:Tyrosine / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism
D001578:Benzopyrans; D006812:Humic Substances; D014874:Water Pollutants, Chemical; D014443:Tyrosine; D014364:Tryptophan; C005023:fulvic acid
Dissolved organic matter; Excitation-emission matrix spectra; Landfill leachates; Parallel factor analysis