Co-pyrolysis with pine sawdust reduces the environmental risks of copper and zinc in dredged sediment and improves its adsorption capacity for cadmium

doi:10.1016/j.jenvman.2023.117502

	Co-pyrolysis with pine sawdust reduces the environmental risks of copper and zinc in dredged sediment and improves its adsorption capacity for cadmium
	Liu, Qunqun; Sheng, Yanqing; Wang, Zheng
发表期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
	2023-05-15
卷号	334 页码:12
关键词	Dredged sediment Heavy metal stabilization Co -pyrolysis Ecological risk Adsorption
DOI	10.1016/j.jenvman.2023.117502
通讯作者	Sheng, Yanqing([email protected])
英文摘要	Proper treatment of heavy metal-contaminated dredged sediment (DS) is crucial to avoid secondary pollution. Effective and sustainable technologies are desired for the treatment of Zn-and Cu-contaminated DS. Due to the advantages of low energy consumption and time saving, co-pyrolysis technology was innovatively applied to treat Cu-and Zn-polluted DS in this study, and the effects of the co-pyrolysis conditions on Cu and Zn stabili-zation efficiencies, potential stabilization mechanisms, and the possibility for resource utilization of co-pyrolysis product were also investigated. The results showed that pine sawdust is an appropriate co-pyrolysis biomass for the stabilization of Cu and Zn based on the leaching toxicity analysis. The ecological risks of Cu and Zn in DS were reduced after co-pyrolysis treatment. The total concentrations of Zn and Cu in co-pyrolysis products were decreased by 5.87%-53.45% and 8.61%-57.45% of that in DS before co-pyrolysis. However, the total concen-trations of Zn and Cu in DS remained basically unchanged after co-pyrolysis, which indicating the decreases in total concentrations of Zn and Cu in co-pyrolysis products were mainly related to dilution effect. Fraction analysis indicated that co-pyrolysis treatment contributed to transforming weakly bound Cu and Zn into stable fractions. The co-pyrolysis temperature and mass ratio of pine sawdust/DS had a greater influence than co -pyrolysis time on the fraction transformation of Cu and Zn. The leaching toxicity of Zn and Cu from the co -pyrolysis products was eliminated when the co-pyrolysis temperature reached 600 and 800 degrees C, respectively. Analysis of the X-ray photoelectron spectroscopy and X-ray diffraction results demonstrated that co-pyrolysis treatment could transform mobile Cu and Zn in DS into metal oxides, metal sulfides, phosphate compounds, etc. Batch adsorption procedures suggested that the co-pyrolysis product possessed a high adsorption capacity for Cd (95.70 mg/g at 318 K). The formation of CdCO3 precipitates and the complexation effects of oxygen -containing functional groups were the principal adsorption mechanisms of the co-pyrolysis product. Overall, this study provides new insights into sustainable disposal and resource utilization for heavy metal-contaminated DS.
资助机构	Shandong Provincial Natural Science Foundation ; Special Research Assistant Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences
收录类别	SCI
语种	英语
关键词[WOS]	HEAVY-METALS ; CD ; STABILIZATION ; TRANSFORMATION ; SULFUR
研究领域[WOS]	Environmental Sciences & Ecology
WOS记录号	WOS:000992013400001
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/36915
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境工程技术研究与发展中心
通讯作者	Sheng, Yanqing
作者单位	Chinese Acad Sci, Yantai Inst Coastal Zone Res, Res Ctr Coastal Environm Engn Technol Shandong Pro, Yantai 264003, Peoples R China
推荐引用方式 GB/T 7714	Liu, Qunqun,Sheng, Yanqing,Wang, Zheng. Co-pyrolysis with pine sawdust reduces the environmental risks of copper and zinc in dredged sediment and improves its adsorption capacity for cadmium[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2023,334:12.
APA	Liu, Qunqun,Sheng, Yanqing,&Wang, Zheng.(2023).Co-pyrolysis with pine sawdust reduces the environmental risks of copper and zinc in dredged sediment and improves its adsorption capacity for cadmium.JOURNAL OF ENVIRONMENTAL MANAGEMENT,334,12.
MLA	Liu, Qunqun,et al."Co-pyrolysis with pine sawdust reduces the environmental risks of copper and zinc in dredged sediment and improves its adsorption capacity for cadmium".JOURNAL OF ENVIRONMENTAL MANAGEMENT 334(2023):12.