In-situ solidification/stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder

Wei-Yi Xia; Yan-Jun Du; Fa-Sheng Li; Chun-Ping Li; Xiu-Lan Yan; Arul Arulrajah; Fei Wang; De-Jun Song

doi:10.1016/j.jhazmat.2019.02.031

In-situ solidification/stabilization of heavy metals contaminated site soil using a dry jet mixing method and new hydroxyapatite based binder

J Hazard Mater. 2019 May 5:369:353-361. doi: 10.1016/j.jhazmat.2019.02.031. Epub 2019 Feb 11.

Authors

Wei-Yi Xia¹, Yan-Jun Du², Fa-Sheng Li³, Chun-Ping Li⁴, Xiu-Lan Yan⁵, Arul Arulrajah⁶, Fei Wang⁷, De-Jun Song⁸

Affiliations

¹ Jiangsu Provincial Academy of Environmental Science, Jiangsu Provincial Key Laboratory of Environmental Engineering, Nanjing, Jiangsu, 210036, China; Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing, 210096, China. Electronic address: xiaweiyi@seu.edu.cn.
² Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing, 210096, China. Electronic address: duyanjun@seu.edu.cn.
³ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: lifs@craes.org.cn.
⁴ State Key Laboratory of Solid Waste Resources Utilization and Energy Saving Building Materials, Beijing Building Materials Academy of Science Research, Beijing, 100041, China. Electronic address: lichp-xj@163.com.
⁵ Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China. Electronic address: yanxl@igsnrr.ac.cn.
⁶ Department of Civil and Construction Engineering, Swinburne University of Technology, Hawthorn, Victoria, 3122, Australia. Electronic address: aarulrajah@swin.edu.au.
⁷ Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing, 210096, China. Electronic address: 101012020@seu.edu.cn.
⁸ Beijing Zhongyan Technology Co., Ltd., Beijing, 100041, China. Electronic address: s_jackson920@163.com.

PMID: 30784965
DOI: 10.1016/j.jhazmat.2019.02.031

Abstract

In this study, in-situ treatment using dry jet mixing construction method and SPC (single superphosphate and calcium oxide) new binder are used to solidify/stabilize a heavy metal contaminated site soil with relatively high content of organic matters. Time-dependent field performance of the soils at 41 and 326 days after treatment is evaluated, which includes electrical conductivity (EC), leachability of heavy metals and chemical oxygen demand (COD), soil penetration resistance, acid neutralization capacity (ANC), and chemical speciation of heavy metals. The results indicate that the stabilized soils exhibit satisfactory performance which is comparable with the laboratory study. In-situ SPC treatment significantly decreases EC values and increases penetration resistance values of the soils. Leachability of lead, zinc, cadmium and COD decreases with increasing SPC content or curing time. Large percentages of heave metals in the soils are transformed from exchangeable fractions to residual fractions after treatment. These, coupled with the improved ANC, result in low heavy metal leachability in stabilized soils.

Keywords: Contaminated soil; Field trial; In-situ solidification/stabilization; Leachability; Penetration resistance.

Publication types

Research Support, Non-U.S. Gov't