Current situation of landfill leachate production and treatment prospect in China
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Abstract:
The disposal of leachate is highly valued by the government due to its characteristics of high concentration of pollutants and ecological risk. Based on literature survey, this paper investigated the output and pollution characteristics of different kinds of leachate from transfer stations, incineration plants and landfills. The development of leachate disposal technology and management was examined based on the current solid waste treatment policy. The results show that with the construction of “zero waste cities”, the difficulties in leachate disposal can be alleviated both in terms of quantity and quality with the implementation of policies such as garbage classification and “zero landfill” of crude waste, while middle and aged-landfill leachate has become the main target in the future. The technical mode of “pretreatment + biological treatment + advanced treatment” was applied as an effective means for leachate disposal. With the wide implementation of garbage classification, particular attention was given to local optimization in pre-treatment stage. The development of low carbon and carbon-free denitrification process can significantly achieve increased operational efficiency and consumption reduction during biological treatment stage. In the stage of advanced treatment, non-membrane full quantification treatment process was the main focus for proper disposal of concentrated leachate and trace organic compounds removal, which is helpful to achieve a more comprehensive risk control on leachate pollution.
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Supported by National Key Research & Development Program of China (2019YFD1100503) ,and the Fundamental Research Funds for the Central Universities (2019CDCGHS307).
