Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 24, Issue 36, Pages 27822-27832Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-0266-x
Keywords
Dynamic leaching; Geogenic arsenic; Hazardous waste treatment; Mineral admixture; Stabilization/solidification; Soil remediation
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Funding
- Hong Kong Research Grants Council [PolyU 15222115, 152132/14E]
- Civil Engineering and Development Department of HKSAR Government
- Hong Kong Scholars Program [XJ2016035]
- National Natural Science Foundation of China [41602315]
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Cement-based stabilization/solidification (S/S) is a practical treatment approach for hazardous waste with anthropogenic As sources; however, its applicability for geogenic As-containing soil and the long-term leaching potential remain uncertain. In this study, semi-dynamic leaching test was performed to investigate the influence of S/S binders (cement blended with fuel ash (FA), furnace bottom ash (FBA), or ground granulated blast furnace slag (GGBS)) on the long-term leaching characteristics of geogenic As. The results showed that mineral admixtures with higher Ca content and pozzolanic activity were more effective in reducing the leached As concentrations. Thus, cement blended with FBA was inferior to other binders in suppressing the As leaching, while 20% replacement of ordinary Portland cement by GGBS was considered most feasible for the S/S treatment of As-containing soils. The leachability of geogenic As was suppressed by the encapsulation effect of solidified matrix and interlocking network of hydration products that were supported by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) results. The long-term leaching of geogenic As from the monolithic samples was diffusion-controlled. Increasing the Ca content in the samples led to a decrease in diffusion coefficient and an increase in feasibility for controlled utilization of the S/S-treated soils.
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