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

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

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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.

Polybrominated diphenyl etherColloid-facilitated transportE-waste recycling siteUndisturbed soil coreGroundwater quality

Zebin Huo、Mengjun Xi、Lianrui Xu、Chuanjia Jiang、Wei Chen

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College of Environmental Science and Engineering,Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,Nankai University,Tianjin 300350,China

国家重点研发计划国家自然科学基金Tianjin Municipal Science and Technology Bureau(China)中央高校基本科研业务费专项教育部项目

2019YFC18042022202010200421JCZDJC0028063233056T2017002

2024

10.1007/s11783-024-1781-x

环境科学与工程前沿
高等教育出版社

环境科学与工程前沿

影响因子：0.545
ISSN：2095-2201
年,卷(期)：2024.18(2)
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