Sustainable stabilization/solidification of arsenic-containing soil by blast slag and cement blends
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Arsenic (As) is a naturally occurring trace element that may pose a threat to human health and the ecosystem, while effective remediation and sustainable reuse of As-containing soil is a challenge. This study investigated the geoenvironmental characteristics of a geogenic As-rich soil, and green binders (ground granulated blast slag (GGBS) and cement blends) were employed for the stabilization/solidification (S/S) of the soil under field-relevant conditions. Results indicate that the use of 10% binder could effectively immobilize As and chemical stabilization/physical encapsulation jointly determined the leaching characteristics of the S/S soils. The geogenic As could be effectively immobilized at the pH range of 5.5–6.5. The increasing use of GGBS enhanced the strength of the 28-d cured S/S soils because of long-term pozzolanic reaction, but also slightly improved the As leachability. Besides, the moisture content of the contaminated soils should be suitably adjusted to allow for desirable compaction of S/S soils, which resulted in high compressive strength and low of As leachability. Results show that soil moisture content of 20% was the most appropriate, which resulted in the highest strength and relatively lower As leaching. In summary, this study presents a sustainable S/S binder for recycling As-contaminated soil by using a combination of cement and GGBS.
Details
Original language | English |
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Article number | 129868 |
Journal | Chemosphere |
Volume | 271 |
Publication status | Published - May 2021 |
Peer-reviewed | Yes |
External IDs
PubMed | 33736205 |
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Keywords
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- Arsenic immobilization, Green and sustainable remediation, Low-carbon binders, Soil remediation and recycling, Stabilization/solidification