Lai Xiaojun, Liang Wenbo, Han Shuwen, Li Yang, Ning Xun-An
School of Environment and Chemical Engineerin, Foshan University, Foshan 528000, China.
School of Environment and Chemical Engineerin, Foshan University, Foshan 528000, China.
J Hazard Mater. 2025 Sep 5;495:139015. doi: 10.1016/j.jhazmat.2025.139015. Epub 2025 Jun 21.
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/PDS) and Fe/HO 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/HO/Cl (140 mM; 1/1) demonstrated superior efficiency in reducing total organic chlorine compared to Fe/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.
纺织印染污泥（TDS）的化学调理是其脱水和处理的关键步骤。然而，在此过程中与芳香族卤代化合物（AHCs）相关的动态变化和环境风险仍知之甚少。本研究通过结合有机物分级分离、非靶向鉴定（高分辨率质谱法）和AHCs筛选清单，确定了TDS中的代表性AHCs，并利用Fe²⁺/过硫酸盐（Fe/PDS）和Fe/羟基自由基（Fe/HO）处理系统地探究了这些典型AHCs在TDS中的转化。这种筛选方法在三个原始TDS样品中鉴定出49 - 59种芳香族氯化物和39 - 48种芳香族溴化物，其中存在多氯萘、多氯联苯（PCBs）和多氯二苯并对二恶英/呋喃等可能在废水二次处理过程中产生的有害化合物。TDS氧化处理结果表明，总有机卤含量在化学调理初期增加，但在30分钟后下降。与Fe/PDS/Cl（140 mM；1/1）相比，Fe/HO/Cl（140 mM；1/1）在降低总有机氯方面表现出更高的效率。然而，两种处理都引发了高卤化和有毒副产物的形成，特别是PCBs和六氯苯物质，这些物质已被禁止使用和生产。本研究为评估与TDS化学调理和不完全焚烧过程相关的环境风险提供了理论基础。
