白泥复合衬层防渗稳定性的研究

为考察白泥复合防渗衬层的防渗稳定性和对污染物的阻滞去除能力，利用自制击实渗透仪对白泥和亚粘土防渗衬层进行了对比研究. 结果表明:白泥/亚粘土“夹层结构"复合衬层能保持低于国家防渗规范(10－7 cm/s)的防渗性，并对渗滤液中的重金属，COD_Cr和NH₄＋-N具有较强的阻滞去除能力，可以与常用的亚粘土防渗衬层相媲美，不过其淋滤出水ρ(Cl－)高，因此其长期防渗稳定性需进一步研究；60%白泥+40%亚粘土“混合式"复合衬层和白泥防渗衬层在渗滤液渗透作用下，其防渗性能不好，渗透系数超过国家防渗规范要求，因此不宜用于填埋场防渗. 

Study on Anti-Seepage Stability of Soda Residue Compound Liners in Landfills

In order to investigate the anti-seepage stabilities and the attenuation capability against leachate pollutants of soda residue compound liner,the comparative permeation experiments in home-made compacted permeameters were carried out among soda residue compound liner,soda residue liner and subclay liner.Results show that the soda residue/subclay intercalation compound liner has excellent anti-seepage stability and attenuation ability of heavy metal,COD_(Cr) and NH_4~+-N in leachate,which can come up to the subclay liner.But liner seepage has high Cl~-mass concentration.So it is necessary to have more research on the long term anti-seepage stability.The hydraulic conductivity of the 60% soda residue+40% subclay mixture compound liner and the soda residue liner goes beyond the limit of 10~(-7)(cm/s) with infiltration of leachate,and it is unsuitable to be landfill liner.