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Study on the Movement Characteristics of Recirculated Leachate by Cl~- Tracer Experiment

LI Qi-bin et al(College of Environmental Science and Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031)  
Based on the Cl-tracer experiment,the movement characteristics of recirculated leachte and the effect of density and height of waste on it were studied.It was shown that after leachate recirculation,the movement mode of leachate included channel flow and matrix flow;In the course of movement,recirculated leachate blended and exchanged with leachate inherent water in waste,and all of them which washed out from waste would take a long time.The smaller density and height of waste,the more significant the effect of channel flow was,the more unconspicuous the effect of recirculated leachate blended and exchanged with leachate inherent water in waste was.It should be done to increase the density and height of waste in a bioreactor landfill which adopted leachate recirculation.
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