垃圾填埋场腾发覆盖系统控制渗滤效果的研究

Study on Leachate Control Effect of Evapotranspiration Landfill Cover System

腾发覆盖垃圾填埋系统(ET Landfill)利用覆盖层土壤的储水能力及植被的腾发作用对进入覆盖层的降水进行调节,达到控制渗滤的目的。通过对不同覆盖层结构和植被组合的腾发覆盖系统的水均衡动态进行试验研究,探讨了不同组合条件下的土壤水分动态过程和渗滤控制效果。结果表明,相对于无植物覆盖系统,腾发覆盖系统能够有效地调节覆盖土层的储水量,减少垃圾填埋场的渗滤液。在有植物覆盖的各组试验中,种植灌木为主60cm覆盖土层的渗滤控制效果最好,而完全种植草本植物40cm覆盖层的控制效果最差。

The evapotranspiration landfill cover systems use the moisture storage capacity of the soil cover and the evapotranspiration of the vegetation to adjust rainfall which infiltrates into the landfill cover, so as to control leachate. An experiment was conducted to research the water balance performance of the evapotranspiration landfill cover systems with different combinations of covers and vegetation types. The soil water balance process and leachate control effect under different combinations were discussed. The results show that the vegetated cover is more effective than the non-vegetated cover in adjusting the moisture storage of the soil layer and minimizing leachate of the landfill. In those vegetated covers, the one which is 60 cm and mainly vegetated with shrub is the most effective in leachate control, and the one which is 40 cm and entirely vegetated with herbage is the most ineffective.