Fluorescence excitation-emission matrix spectroscopy analysis of landfill leachate DOM in coagulation-flocculation process.
Landfill leachate contains a variety of organic matters, some of which can be excited and emit fluorescence signal. In order to degrade these organic matters, the pretreatment of the leachate is needed, which can improve the degradation performance of post-treatment process. Coagulation-flocculation is one of the important pretreatment processes to treat landfill leachate. Assessing the chemical compositions of landfill leachate is helpful in the understanding of their sources and fates as well as the mechanistic behaviors in the water environment. The present work aimed to use fluorescence excitation-emission matrix spectroscopy (EEMs) to characterize the chemical fractions of landfill leachate dissolved organic matter (DOM) in conjunction with parallel factor analysis (PARAFAC). Results showed that the DOM of landfill leachate tested in this study was identified resulting from microbial input, which included five typical characteristic peaks and four kinds of PARAFAC fractions. These fractions were mainly composed of hydrophobic macromolecule humic acid-like (HM-HA), hydrophilic intermediate molecular fulvic acid-like (HIM-FA), and hydrophilic small molecule protein-like substances (HSM-PS). HM-HA and HIM-FA were found to be easier to remove than HSM-PS. Further research on HSM-PS removal by coagulation-flocculation still needs to be improved.
a College of Civil Engineering , Hunan University of Science & Technology , Xiangtan , People's Republic of China.
Guocheng
G
Zhu
a College of Civil Engineering , Hunan University of Science & Technology , Xiangtan , People's Republic of China.
Chuang
C
Wang
b Huajie Environmental Protection Engineering Co., Ltd. , Yibin , People's Republic of China.
Xingwei
X
Dong
D000534:Alum Compounds / Q000737:chemistry; D001578:Benzopyrans / Q000032:analysis* / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D005427:Flocculation; D006812:Humic Substances / Q000032:analysis*; D057927:Hydrophobic and Hydrophilic Interactions; D017942:Nitric Acid / Q000737:chemistry; D010756:Phosphoric Acids / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry*
D000534:Alum Compounds; D001578:Benzopyrans; D002254:Carbonates; D005296:Ferrous Compounds; D006812:Humic Substances; D010756:Phosphoric Acids; D014874:Water Pollutants, Chemical; C041524:aluminum sulfate; C020748:ferrous sulfate; D017942:Nitric Acid; C005686:sodium carbonate; C030242:phosphoric acid; C005023:fulvic acid
Fluorescence excitation–emission matrix spectroscopy; coagulation–flocculation process; dissolved organic matter; landfill leachate; parallel factor analysis