Xiaojun Lai, Wenbo Liang, Shuwen Han, Yang Li, Xun-an Ning
{"title":"探讨纺织印染污泥在Fe2+基化学处理过程中芳香族卤化化合物的特性及其转化","authors":"Xiaojun Lai, Wenbo Liang, Shuwen Han, Yang Li, Xun-an Ning","doi":"10.1016/j.jhazmat.2025.139015","DOIUrl":null,"url":null,"abstract":"The chemical conditioning of textile dyeing sludge (TDS) is an essential step in its dehydration and treatment. However, the dynamic changes and environmental risks associated with aromatic halogenated compounds (AHCs) during this process remain poorly understood. In this study, representative AHCs in TDS were identified by combining organic matter fractional separation, non-targeted identification (HRMS) and AHCs screening list, and the transformation of these typical AHCs in TDS was systematically explored by using Fe²⁺/peroxysulfate (Fe<sup>2+</sup>/PDS) and Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> treatments. This screening approach identified 49–59 aromatic chlorides and 39–48 aromatic bromides in three original TDS samples, with the presence of hazardous compounds like polychlorinated naphthalenes, polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-p-dioxins/furans that may be generated during the secondary treatment of wastewater. The results of TDS oxidation treatment showed that the total organic halogen content initially increased during chemical conditioning but decreased after 30 min. Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>/Cl<sup>-</sup> (140 mM; 1/1) demonstrated superior efficiency in reducing total organic chlorine compared to Fe<sup>2+</sup>/PDS/Cl<sup>-</sup> (140 mM; 1/1). However, both treatments triggered the formation of highly halogenated and toxic byproducts, particularly PCBs and hexachlorobenzene—substances banned from use and production. This study provides a theoretical foundation for evaluating the environmental risks associated with TDS chemical conditioning and incomplete incineration processes.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"43 1","pages":""},"PeriodicalIF":11.3000,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Exploring the characteristics and transformation of aromatic halogenated compounds in textile dyeing sludge during Fe2+-based chemical treatment\",\"authors\":\"Xiaojun Lai, Wenbo Liang, Shuwen Han, Yang Li, Xun-an Ning\",\"doi\":\"10.1016/j.jhazmat.2025.139015\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The chemical conditioning of textile dyeing sludge (TDS) is an essential step in its dehydration and treatment. However, the dynamic changes and environmental risks associated with aromatic halogenated compounds (AHCs) during this process remain poorly understood. In this study, representative AHCs in TDS were identified by combining organic matter fractional separation, non-targeted identification (HRMS) and AHCs screening list, and the transformation of these typical AHCs in TDS was systematically explored by using Fe²⁺/peroxysulfate (Fe<sup>2+</sup>/PDS) and Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub> treatments. This screening approach identified 49–59 aromatic chlorides and 39–48 aromatic bromides in three original TDS samples, with the presence of hazardous compounds like polychlorinated naphthalenes, polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-p-dioxins/furans that may be generated during the secondary treatment of wastewater. The results of TDS oxidation treatment showed that the total organic halogen content initially increased during chemical conditioning but decreased after 30 min. Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>/Cl<sup>-</sup> (140 mM; 1/1) demonstrated superior efficiency in reducing total organic chlorine compared to Fe<sup>2+</sup>/PDS/Cl<sup>-</sup> (140 mM; 1/1). However, both treatments triggered the formation of highly halogenated and toxic byproducts, particularly PCBs and hexachlorobenzene—substances banned from use and production. 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Exploring the characteristics and transformation of aromatic halogenated compounds in textile dyeing sludge during Fe2+-based chemical treatment
The chemical conditioning of textile dyeing sludge (TDS) is an essential step in its dehydration and treatment. However, the dynamic changes and environmental risks associated with aromatic halogenated compounds (AHCs) during this process remain poorly understood. In this study, representative AHCs in TDS were identified by combining organic matter fractional separation, non-targeted identification (HRMS) and AHCs screening list, and the transformation of these typical AHCs in TDS was systematically explored by using Fe²⁺/peroxysulfate (Fe2+/PDS) and Fe2+/H2O2 treatments. This screening approach identified 49–59 aromatic chlorides and 39–48 aromatic bromides in three original TDS samples, with the presence of hazardous compounds like polychlorinated naphthalenes, polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-p-dioxins/furans that may be generated during the secondary treatment of wastewater. The results of TDS oxidation treatment showed that the total organic halogen content initially increased during chemical conditioning but decreased after 30 min. Fe2+/H2O2/Cl- (140 mM; 1/1) demonstrated superior efficiency in reducing total organic chlorine compared to Fe2+/PDS/Cl- (140 mM; 1/1). However, both treatments triggered the formation of highly halogenated and toxic byproducts, particularly PCBs and hexachlorobenzene—substances banned from use and production. This study provides a theoretical foundation for evaluating the environmental risks associated with TDS chemical conditioning and incomplete incineration processes.
期刊介绍:
The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.