Mechanistic insights into red mud, blast furnace slag, or metakaolin-assisted stabilization/solidification of arsenic-contaminated sedimentopen access
- Authors
- Wang, Lei; Chen, Liang; Tsang, Daniel C. W.; Zhou, Yaoyu; Rinklebe, Joerg; Song, Hocheol; Kwon, Eilhann E.; Baek, Kitae; Ok, Yong Sik
- Issue Date
- Dec-2019
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Green/sustainable remediation; Potentially toxic element; Arsenic leachability; Waste valorization/recycling; Hydration and polymerization; Precipitation chemistry
- Citation
- ENVIRONMENT INTERNATIONAL, v.133, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENT INTERNATIONAL
- Volume
- 133
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189545
- DOI
- 10.1016/j.envint.2019.105247
- ISSN
- 0160-4120
- Abstract
- Elevated level of arsenic (As) in marine sediment via deposition and accumulation presents long-term ecological risks. This study proposed a sustainable stabilization/solidification (S/S) of As-contaminated sediment via novel valorization of red mud waste, blast furnace slag and calcined clay mineral, which were selected to mitigate the increased leaching of As under alkaline environment of S/S treatment. Quantitative X-ray diffraction and thermogravimetric analyses illustrated that stable Ca-As complexes (e.g., Ca-5(AsO4)(3)OH) could be formed at the expense of Ca(OH)(2) consumption, which inevitably hindered the hydration process and S/S efficiency. The Si-29 nuclear magnetic resonance analysis revealed that incorporation of metakaolin for As immobilization resulted in a low degree of hydration and polymerization, whereas addition of red mud promoted Fe-As complexation and demonstrated excellent compatibility with As. Transmission electron microscopy and elemental mapping further confirmed the precipitation of crystalline Ca-As and amorphous Fe-As compounds. Therefore, red mud-incorporated S/S binder achieved the highest efficiency of As immobilization (99.9%), which proved to be applicable for both in-situ and ex-situ S/S of As-contaminated sediment. These results advance our mechanistic understanding for the design of green and sustainable remediation approach for effective As immobilization.
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