Colloid-facilitated release of polybrominated diphenyl ethers at an e-waste recycling site: evidence from undisturbed soil core leaching experiments

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Zebin Huo, Mengjun Xi, Lianrui Xu, Chuanjia Jiang, Wei Chen
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Abstract

Polybrominated diphenyl ethers (PBDEs), a class of persistent organic pollutants, have been frequently detected in soil at e-waste recycling sites. However, the key factors controlling the transport of PBDEs from surface soil to the vadose zone and groundwater are unclear. Here, colloid-enhanced leaching of PBDEs from undisturbed soil cores collected at an e-waste recycling site in Tianjin, China, is reported. Spatially heterogeneous release of colloids and PBDEs was observed in all the tested soil cores under chemical and hydrodynamic perturbations, indicating the presence of preferential flow paths. Colloid concentration in the effluent significantly increased as ionic strength decreased (from 10 to 0.01 mmol/L), probably due to the stronger electrostatic repulsion between colloidal particles and the soil matrix at lower ionic strength. In contrast, colloid mobilization was not significantly affected by the changes in pH of the influent (from 4.0 to 10.0) and flow rate (from a Darcy velocity of 1.5 to 6.0 cm/h). The concentrations of 2,2′,3,3′,4,4′,5,5′,6,6′-decabromodiphenyl ether (BDE-209), the predominant PBDE congener at the site, detected in the leachate (ranging from 1.09 to 3.43 ng/L) were much lower than previously reported results from packed column leaching tests, and were positively correlated with colloid concentrations. This indicates that remobilization of colloids at e-waste recycling sites can promote the leaching and downward migration of PBDEs from surface soil. The findings highlight the potential risk of surface soil PBDE contamination to groundwater quality and call for further understanding of colloid-facilitated transport for predicting the fate of PBDEs at e-waste recycling sites.

Abstract Image

胶体促进释放多溴联苯醚在一个电子废物回收站点:来自未受干扰的土壤核心浸出实验的证据
多溴联苯醚(PBDEs)是一类持久性有机污染物,在电子垃圾回收站的土壤中经常被检测到。然而,控制多溴二苯醚从表层土壤向渗透带和地下水运移的关键因素尚不清楚。在这里,胶体增强浸出多溴二苯醚从未受干扰的土壤核心收集在天津的一个电子废物回收站点,中国,报道。在化学和水动力扰动下,所有测试的土芯中都观察到胶体和多溴二苯醚在空间上的非均匀释放,表明存在优先流动路径。随着离子强度的降低(从10 ~ 0.01 mmol/L),出水胶体浓度显著升高,这可能是由于离子强度较低时,胶体颗粒与土壤基质之间的静电斥力更强。相比之下,胶体动员不受进水pH(从4.0到10.0)和流速(从达西速度1.5到6.0 cm/h)变化的显著影响。在渗滤液中检测到的2,2 ',3,3 ',4,4 ',5,5 ',6,6 ' -十溴联苯醚(BDE-209)的浓度(范围为1.09至3.43 ng/L)远低于先前报道的填充柱浸出试验结果,并且与胶体浓度呈正相关。这表明,电子垃圾回收站胶体的再活化可以促进多溴二苯醚从表层土壤的浸出和向下迁移。研究结果强调了表层土壤多溴二苯醚污染对地下水质量的潜在风险,并呼吁进一步了解胶体促进运输,以预测多溴二苯醚在电子废物回收站的命运。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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