Solidification/Stabilization(S/S)of High Concentration Zinc-Contaminated Soils Using Soda Residue

摘要：

　　Solidification/stabilization(S/S)has been considered as one of the most effective techniques for remediation of the heavy metal-contaminated sites.Among various binders adopted in S/S,soda residue is extensively accepted and investigated due to its strong adsorptive capacity for heavy metal ions.In this paper,the engineering properties of the high concentration zinc-contaminated soil solidified/stabilized by soda residue blended with cement have been investigated.Test results showed that the unconfined compressive strength(UCS)of the treated specimen increased with the increase of the soda residue content and the curing time.A higher UCS can be obtained for specimens with lower zinc concentration.In toxicity characteristic leaching procedure(TCLP)test,the concentration of the leached heavy metal ions decreased with the increase of the curing time.Results of UCS and TCLP illustrated that cementsoda residue stabilized zinc-contaminated soil satisfied the standard of strength and leachability when the mass ratio of cement to soda residue was 2 to 8.X-ray diffraction(XRD)analysis obviously showed the formation of the hydrated products such as CSH,CAH and Aft.Zinc ions can be immobilized by precipitating as Zn(OH)2 or incorporating with hydrates to form CaZn2(OH)6H2O.

关键词： Stabilization/solidification Zinc-contaminated soil Soda residue Unconfined compressive strength Leachability

作者: Fusheng Zha Jingjing Liu Yongfeng Deng Long Xu Xiangyang Wang Xiuhong Yang

作者单位: Hefei University of Technology,Hefei 230009,China Southeast University,Nanjing 210096,China

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 683-690

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）