垃圾填埋场渗滤水回灌技术的研究──Ⅰ．垃圾渗滤水填埋场回灌的影响因素

Study on the Back Irrigation of Leachate from Garbage Landfill──I. Influence Factors of Back Irrigation of Leachate from Garbage Landfill

对垃圾填埋场的覆盖土层及其填埋层的微生物对渗滤水的回灌处理的影响进行探索．研究结果表明，为改善覆盖土层的透水性和透气性，在试验所用的亚粘土中必须加入一定比例的细砂，土砂比以７：１为佳．土砂比为７：１的土柱对进水ＣＯＤ负荷为６．６～１１５ｇ·ｍ－２·ｄ－１的渗滤水．在运行两个月的时间内，ＣＯＤ去除率可达９８％左右．对渗滤水回灌填埋场前后的填埋堆层的微生物镜检结果表明，经回灌处理后的填埋场相当于一个生物滤池．

In this paper, the influence of microbes in the cover soil and garbage landfill bed on the disposal of leachate back irrigation was studied. The result demonstyated that the subclay used in the test should mix some sand to disprove the permeability for gas and perviousness of the cover soil bed, and the best mixing ratio of soil and sand was 7: 1. In the testing duration of two months, the COD removal efficiency of the leachate was about 98% when the ratio of soil and sand was 7: 1 and the COD inflow load was 6.6～115g·m-2·d-1. Through the microscope inspection of microbes in the landfill bed before and after leachate back irrigation, it could be found that the landfill bed irrigated by leach liquor was the same as a biological filter.