填埋场渗滤液水位对填埋气收集的影响研究

为研究我国填埋场中气体运移规律建立了考虑我国城市固废组分特点的填埋场液-气运移耦合模型,应用此模型对西安江村沟填埋场现场抽气试验进行模拟分析。结果表明:抽气竖井影响半径随饱和度升高明显缩小;抽气竖井影响范围随堆体水位下降而显著提高,降低堆体水位可显著提高填埋气收集效率。根据分析结果建议对于典型高厨余固废含量填埋场,在设计抽气竖井间距时应考虑高厨余垃圾组分特点及降解规律,并且采取相应措施对填埋场中渗滤液水位进行控制,以提高填埋气收集效率。

Influences of Leachate Level on Landfill Gas Collection

In order to study landfill gas migration rule in China ,a hydraulic-gas coupled model is developed based on characteristics of MSW in China .The extracting test on Jiangcungou landfill is investigated by using the model proposed in this paper .The results show that the influence radius of extract well decrease due to the increase of saturation signifi-cantly ,and increase when leachate level in landfill drops .Keeping a low leachate level is an effective way to improve the landfill gas collection efficiency .According to the analysis results ,some suggestions are proposed for high kitchen waste content landfill management which are the component characteristics and degradation law of MSW with high kitchen waste content should be considered in design of extraction wells spacing ,leachate level in landfill has to be controlled to im-prove the efficiency of landfill gas collection .