导排管径对模拟回灌型准好氧填埋结构运行的影响

Effect of Diameter of Leachate Drainage Pipeline on Operation of Simulated Semi-aerobic Landfill with Leachate Recirculation

为了解导排管管径对准好氧填埋的影响,运用室内模拟试验,分别采用80、50和25 mm 3种导排管管径模拟了回灌型准好氧填埋中垃圾堆体温度、渗滤液产量及水质等运行344 d的变化.结果表明:导排管管径对模拟回灌型准好氧填埋的运行有明显影响,管径越大,渗滤液产量越少,渗滤液pH值上升越快,而化学需氧量、氨氮和总氮等指标的污染负荷也得到快速改善;回灌型准好氧填埋导排管径和堆体水平堆放直径的比例达到1∶32时,渗滤液中有机基质能彻底降解;当二者比例大于1∶16时,不仅渗滤液中的有机基质降解彻底,而且也能迅速削减氮元素.

In order to study the effect of the diameter of leachate drainage pipeline on operational characteristics of semi-aerobic landfills, three simulated semi-aerobic landfills with leachate recirculation were constructed in laboratory using different diameters （ 80, 50, and 25 ram） of leachate drainage pipelines, and the variations in temperature of the waste, quantity of the leachate, quality of the leachate, etc. , during 344 days were analyzed. The results show that the diameter had an obvious influence on the operational characteristics. With the increase of the diameter, the quantity of leachate decreased, the pH of leachate rose quickly, and the leachate quality indexes such as the chemical oxygen demand, NH3-N concentration, and total nitrogen concentration improved rapidly. Under this experimental condition, the organic in the waste could be degraded completely when the diameter ratio of leachate pipeline to waste heap was no less than 1 ： 32. On the other hand, when the diameter ratio reached 1： 16, the organic could be degraded completely, and the nitrogen compounds could be reduced efficiently.