Characterization of refuse landfill leachates of three di erent stagesin landfill stabilization process
LOU Ziyang , DONG Bin , CHAI Xiaoli , SONG Yu , ZHAO Youcai , ZHU Nanwen
DOI:
Received November 23, 2008,Revised February 12, 2009, Accepted , Available online
Volume 21,2009,Pages 1309-1314
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Landfill leachates with di erent 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 m),
coarse colloids (CC) (1.2–0.45 m), fine colloids (FC) (0.45 m, 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.
