Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74433
Title: Dynamic leaching behavior of geogenic As in soils after cement-based stabilization/solidification
Authors: Li, JS 
Wang, L 
Tsang, DCW 
Beiyuan, J 
Poon, CS 
Keywords: Dynamic leaching
Geogenic arsenic
Hazardous waste treatment
Mineral admixture
Soil remediation
Stabilization/solidification
Issue Date: 2017
Publisher: Springer
Source: Environmental science and pollution research, 2017, v. 24, no. 36, p. 27822-27832 How to cite?
Journal: Environmental science and pollution research 
Abstract: Cement-based stabilization/solidification (S/S) is a practical treatment approach for hazardous waste with anthropogenic As sourcesMergeCell 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.
URI: http://hdl.handle.net/10397/74433
ISSN: 0944-1344
EISSN: 1614-7499
DOI: 10.1007/s11356-017-0266-x
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