关于垃圾填埋场渗滤系统渗透性能经时变化的研究

利用模拟实验对垃圾填埋场中渗滤系统的渗透性能与填埋时间的关系进行了研究。采用焚烧灰、土工织物和碎石导流层组成渗透系统,研究了实验时间对渗滤系统的渗透系数以及结晶物颗粒直径的影响。结果表明:由于垃圾焚烧灰中硅酸钙和铝酸钙的结晶作用,随着渗透时间的增加,吸附在土工织物表面的物质逐渐增多,使颗粒之间更紧密,导致空隙减小影响渗滤系统的渗透性能。根据研究结果,在垃圾焚烧灰填埋时,垃圾焚烧灰压实密度不要太高,这样有利于渗滤液的排放。

THE STUDY ON THE CHANGE OF PERMEABILITY OF LEACHATE COLLECTION SYSTEM WITH LAPSE OF TIME

The relationship between the permeability coefficient and lapse of time was investigated by the simulated experiments. The effect of lapse of time on the permeability coefficient of the leachate collection system and the diameter of crystallization metacolloid was analyzed by using the leachate collection system composed of geotextile, MSW incinerated ash and gravel. The results show that the adhesion crystals on geotextile were growing to become more compact between crystallization metacolloids with increasing of the lapse of time because of the crystallization of calcium carbonate and calcium aluminate,the permeability of leachate collection system became small. Based the experimental results, the density of waste is not high to be advantageous for permeability when the MSW incinerated ash is compacted.