模拟准好氧填埋场填埋气分布规律研究

Distribution rule of landfill gas in simulated semi-aerobic landfill

采用室内试验,研究不同区域、不同时段填埋气中CH4、CO2的变化情况,并根据导气管距离变化、不同部位温度及渗滤液pH值的变化趋势,分析各因素对准好氧填埋场填埋气的影响。结果表明：准好氧填埋场中不同区域的填埋气中均含有一定量的CH4,但其比例较厌氧填埋场明显偏小,一般最大不超过30%;填埋气中CH4及CO2含量具有下层〉上层特点,稳定期下层填埋气中CH4比例维持在20%~30%,而上层CH4浓度始终小于5%。离导气管距离越远,CH4浓度越高。当pH值大于6.4和7.1时有利于CO2和CH4的产生,最大百分含量分别达到29%和32%。

The changing situation of CH4 and CO2 among the landfill gas in different regions and different times was studied with the use of laboratory tests.According to the airway from different parts of the temperature and pH value of leachate trends,the factors aligned the aerobic landfill the impact of landfill gas were analyzed.The results showed that semi-aerobic landfill in the landfill gas in different regions contain a certain amount of CH4,but the proportion was significantly smaller than the anaerobic landfill,generally no more than 30% of the maximum;landfill gas CH4 and CO2 content with a lower〉 upper features,stable lower proportion of CH4 landfill gas maintained at 20% to 30%,while the upper CH4 concentration was always less than 5%.Farther away from the airway,CH4 concentration was higher.The situation that the pH value was greater than 6.4 and 7.1 would help the production of CO2 and CH4,respectively,the maximum percentage content of 29% and 32%.