摘要
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(10-7cm/s)的防渗性,并对渗滤液中的重金属,CODCr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.
In order to investigate the antl-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, CODcr and NH4 -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.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2007年第3期113-118,共6页
Research of Environmental Sciences
基金
国家自然科学基金资助项目(20307009)
关键词
白泥
复合衬层
渗滤液
防渗稳定性
soda residue
compound liner
leachate
anti-seepage stability
