Research article - Peer-reviewed, 2022
A novel method for in situ stabilization of calcium arsenic residues via yukonite formation
Wang, Yumeng; Wang, Shaofeng; Song, Yu; Zhang, Peiwen; Ma, Xu; Lin, Jinru; Lv, Hongtao; Zhang, Danni; Yao, Shuhua; Jia, YongfengAbstract
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; YukonitePublished in
Science of the Total Environment2022, volume: 819, article number: 153090
Authors' information
Wang, Yumeng
Shenyang Institute of Applied Ecology, CAS
Wang, Yumeng
Chinese Academy of Sciences
Wang, Shaofeng
Dalian University of Technology
Wang, Shaofeng
Shenyang Institute of Applied Ecology, CAS
Chinese Academy of Sciences
Zhang, Peiwen
Chinese Academy of Sciences
Zhang, Peiwen
Shenyang Institute of Applied Ecology, CAS
Ma, Xu
Dalian University of Technology
Lin, Jinru
Shenyang Institute of Applied Ecology, CAS
Lv, Hongtao
Affairs Serv Ctr Ecol Environm Liaoning Prov
Zhang, Danni
Shenyang Institute of Applied Ecology, CAS
Yao, Shuhua
Shenyang University of Chemical Technology
Jia, Yongfeng
Shenyang Institute of Applied Ecology, CAS
UKÄ Subject classification
Environmental Sciences
Publication Identifiers
DOI: https://doi.org/10.1016/j.scitotenv.2022.153090
URI (permanent link to this page)
https://res.slu.se/id/publ/116858