Song, Yu
- Chinese Academy of Sciences
Abstract
Stabilizing the hazardous calcium arsenic residues (CAR) and monitoring the subsequent fate of arsenic (As) are critical to reduce its risk to the environment. In this work, a novel in situ method has been proposed to stabilize CAR by adding FeIII solution and subsequent formation of the secondary mineral (yukonite). The experiments were conducted at pH 6-9 with different Fe/As molar ratios (0.28-0.66) and the solid phases were characterized by using X-ray diffraction and scanning/transmission electron microscopy. Results showed that the stability of the CAR was significantly increased after the addition of Fe-III solution, indicating good fixation effectiveness. The dissolved As concentration in the treated CAR samples continuously decreased to 5 mg/L after 490 days of treatment at Fe/As molar ratio >= 0.54 and pH >= 8, with the leached As concentration lower than 5 mg/L (US EPA standard) for most of the treated CAR in the TCLP and HVM tests. The formation of yukonite under different experimental conditions is closely related to the enhanced stability of the treated CAR. This work provides a novel in situ method to treat CAR which might have potential for future industrial applications.
Keywords
Calcium arsenic residues; Iron; Stabilization; In situ treatment; Yukonite
Published in
Science of the Total Environment
2022, volume: 819, article number: 153090
SLU Authors
UKÄ Subject classification
Environmental Sciences
Publication identifier
- DOI: https://doi.org/10.1016/j.scitotenv.2022.153090
Permanent link to this page (URI)
https://res.slu.se/id/publ/116858