Characterization of refuse landfill leachates of three di erent stages
in landfill stabilization process |
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Authors: | LOU Ziyang DONG Bin CHAI Xiaoli SONG Yu ZHAO Youcai and ZHU Nanwen |
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Institution: | [1]School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China. [2]The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract: | Landfill leachates with different ages (mature leachate, 11 years; semi-mature leachate, 5 years; fresh leachate, under operation) were collected from Laogang Refuse Landfill, Shanghai to characterize the colloid size distribution and variations of leachate. These leachates were separated using micro-filtration and ultra-filtration into specific size fractions, i.e., suspended particles (SP) (> 1.2 μm), coarse colloids (CC) (1.2–0.45 μm), fine colloids (FC) (0.45 μm, 5 kDa/1 kDa molecular weight (MW)), and dissolved organic matters (DM, < 5 kDa/1 kDa MW). The specific colloids in each size fraction were quantified and characterized through chemical oxygen demands (COD), total solid (TS), pH, NH4+-N, total organic carbon (TOC) and fixed solid (FS). It was found that COD, NH4+-N and TS in leachate decreased significantly over ages, while pH increased. The dissolved fractions (< 5 kDa/1 kDa) dominated (over 50%) in three leachates in terms of COD, and the organic matter content in dissolved fraction of leachates decreased and the inorganic matter increased as the disposal time extended, with the TOC/COD ratio 30%–7%. Dissolved fractions decreased from 82% to 40% in terms of TOC as the disposal time extended, suggested that the organic matter remained in leachate would form into middle molecular weight substances during the degradation process. |
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Keywords: | characterization landfill leachate different ages size-distribution |
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