Effects of transient flow conditions on colloid-facilitated release of decabromodiphenyl ether:Implications for contaminant mobility at e-waste recycling sites  

作　　者：Yueyue Li Zebin Huo Yuqin Ying Lin Duan Chuanjia Jiang Wei Chen 

机构地区：[1]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

出　　处：《Eco-Environment & Health》2024年第3期317-324,共8页生态环境与健康（英文）

基　　金：supported by the National Key Research and Development Program of China(2019YFC1804202);the National Natural Science Foundation of China(22276101 and 22020102004);the Fundamental Research Funds for the Central Universities(63233056);the Ministry of Education of China(T2017002).

摘　　要：Polybrominated diphenyl ethers(PBDEs)are ubiquitous contaminants,especially in the soil and groundwater of contaminated sites and landfills.Notably,2,20,3,30,4,40,5,50,6,60-decabromodiphenyl ether(BDE-209),one of the most frequently and abundantly detected PBDE congeners in the environment,has recently been designated as a new pollutant subject to rigorous control in China.Colloid-facilitated transport is a key mechanism for the release of PBDEs from surface soils and their migration in the aquifer,but the effects of hydrodynamic conditions,particularly transient flow,on colloid-facilitated release of PBDEs are not well understood.Herein,we examined the effects of typical transient flow conditions on the release characteristics of colloids and BDE-209 from surface soil collected from an e-waste recycling site by undisturbed soil core leaching tests involving multiple dry–wet cycles(with different drying durations)and freeze–thaw cycles.We observed significant positive correlations between BDE-209 and colloid concentrations in the leachate in both the dry–wet and freeze–thaw leaching experiments,highlighting the critical role of colloids in facilitating BDE-209 release.However,colloids mobilized during the dry–wet cycles contained higher contents of BDE-209 than those in the freeze–thaw cycle tests,and the difference was primarily due to the more intensive disintegration of soil aggregates and elution of newly formed inorganic colloidal particles(mainly primary silicate minerals such as quartz and albite)with low BDE-209 content during the freeze–thaw process.These findings underscore the necessity of considering transient flow conditions when assessing the fate and risks of PBDEs at contaminated sites.

关 键 词：Hydrophobic organic contaminants Colloid-facilitated transport Dry-wet cycle Freeze-thaw cycle Undisturbed soil core 

分 类 号：X70[环境科学与工程—环境工程]