填埋结构对填埋场稳定化的影响

Influence of landfill structure on stabilization of landfill site.

依据准好氧填埋和厌氧填埋的原理,构建了大型模拟填埋场,并定期对渗滤液水质进行监测分析;根据所获得的渗滤液水质变化数据,利用指数法对2种结构的填埋场稳定化进行了评价.结果表明,准好氧填埋比厌氧填埋结构更有利于渗滤液中污染物尤其是NH3-N的去除;准好氧填埋场稳定化速率大于厌氧填埋场;准好氧填埋场在封场25周后稳定化综合指数I<50,达到二级稳定化程度,渗滤液水质达二级排放标准;厌氧填埋场在实验期内稳定化综合指数I>100,稳定化等级为四级,渗滤液水质在三级排放标准以下.

Large-scale simulated landfill sites were built based on the semi-aerobic landfill and anaerobic landfill theories and the water quality of leachate was determined and analyzed at decided period. Based on the data of the water quality change of leachate obtained the stabilization of landfill site of two kinds of structure was evaluated utilizing exponential technique, The semi-aerobic landfill site was more favorable than the anaerobic landfill site structure in reducing the pollutants especially NH3-N in the leachate. The stabilization velocity of semi-aerobic landfill site was greater than that of anaerobic landfill site, After 25 weeks of closing, the stabilization integrate index of semi-aerobic landfill I〈50 reached the stabilization degree of two grade; the water quality of leachate reached two grade of discharge standards. The anaerobic landfill site stabilization integrate index 1 〉100 and stabilization grade of four degree in the test period; the water quality of leachate was below three grade of discharge standard.