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Sustainable remediation of lube oil-contaminated soil by low temperature indirect thermal desorption: Removal behaviors of contaminants, physicochemical properties change and microbial community recolonization in soils*
Sang, Yimin; Yu, Wang; He, Liao; Wang, Zhefeng; Ma, Fujun; Jiao, Wentao; Gu, Qingbao
2021-12-15
Source PublicationENVIRONMENTAL POLLUTION
ISSN0304-3894
Volume419Pages:-
AbstractLarge amounts of hazardous arsenic sulfide (As2S3) wastes are generated in many industries. These wastes, which are extremely unstable and can partially transform into highly soluble arsenic oxide (As2O3) and then transform into As2S3 and As2O3 mixed wastes (ASOW), are difficult to be solidified/stabilized using common binders. This study proposed a thermally initiated copolymerization method employing elemental sulfur (S-8) to chemically solidify/stabilize ASOW. Under thermal conditions (140-200 degrees C), the elemental sulfur rings break and polymerize into diradical polymeric sulfur chains (center dot S-(S)(m)-S center dot). The ASOW is solidified/stabilized not only by transforming As2S3 into poly(As2S3-r-S) copolymers through copolymerization of center dot S-(S)(m)-S center dot with As2S3 but also by transforming As2O3 into As2S3 in the presence of poly(As2S3-r-S) copolymers. However, the sulfur chain in poly(As2S3-r-S) copolymers gradually crystallizes into S-8 after long-term aging, resulting in the depolymerization of copolymers. Dicyclopentadiene (DCP) greatly improves the long-term stability of the solidified body through maintaining the sulfur chain form by forming highly stable poly(As2S3-r-S-r-DCP) copolymers. The solidified body showed high compressive strength (25.7 MPa) and low leaching concentration of arsenic (<1.2 mg L-1) even after 732 days of aging. This study provides a theoretical foundation for the S-8-based chemical solidification/stabilization of ASOW as well as other sulfide-containing wastes.
Department城市与区域生态国家重点实验室
KeywordThermal treatment Arsenic wastes S-8 Copolymerization Long-term stable copolymers
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46765
Collection城市与区域生态国家重点实验室
Affiliation1.Beijing Inst Petrochem Technol, Dept Environm Engn, Beijing 102617, Peoples R China
2.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Sang, Yimin,Yu, Wang,He, Liao,et al. Sustainable remediation of lube oil-contaminated soil by low temperature indirect thermal desorption: Removal behaviors of contaminants, physicochemical properties change and microbial community recolonization in soils*[J]. ENVIRONMENTAL POLLUTION,2021,419:-.
APA Sang, Yimin.,Yu, Wang.,He, Liao.,Wang, Zhefeng.,Ma, Fujun.,...&Gu, Qingbao.(2021).Sustainable remediation of lube oil-contaminated soil by low temperature indirect thermal desorption: Removal behaviors of contaminants, physicochemical properties change and microbial community recolonization in soils*.ENVIRONMENTAL POLLUTION,419,-.
MLA Sang, Yimin,et al."Sustainable remediation of lube oil-contaminated soil by low temperature indirect thermal desorption: Removal behaviors of contaminants, physicochemical properties change and microbial community recolonization in soils*".ENVIRONMENTAL POLLUTION 419(2021):-.
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