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《环境科学学报(英文版)》 2009-09
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Characterization of refuse landfill leachates of three different stages in landfill stabilization process

LOU Ziyang1,2,DONG Bin2,CHAI Xiaoli2,SONG Yu2,ZHAO Youcai2,ZHU Nanwen1 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  
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)(1.2μm) ,coarse colloids(CC)(1.2–0.45μm) ,fine colloids(FC)(0.45μm,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.
【Fund】: supported by the State Key Laboratory of Pollution Control and Resource Reuse Foundation(No.PCRRF09008);; the Key Project of Science and Technology Commission of Shanghai Municipality (No.08Dz1202800)
【CateGory Index】: X703
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