State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, China.
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, China.
Chemosphere. 2023 Sep;334:138996. doi: 10.1016/j.chemosphere.2023.138996. Epub 2023 May 19.
There is a lack of simple and effective methods to quantify the fate processes of persistent organic pollutants (POPs) in bioretention systems. In this study, the fate and elimination processes of three typical C-labeled POPs in regularly added bioretention columns were quantified using stable carbon isotope analysis techniques. The results showed that the modified media bioretention column removed more than 90% of Pyrene, PCB169 and p,p'-DDT. Media adsorption was the dominant removal mechanism for the reduction of the three exogenous organic compounds (59.1-71.8% of the input) although plant uptake (5.9-18.0%) was also important. Mineralization was effective in degrading pyrene (13.1%) but had a very limited effect on p,p'-DDT and PCB169 removal (<2.0%), the reason for which may be related to the aerobic conditions of the filter column. Volatilization was relatively weak and negligible (<1.5%). The presence of heavy metals inhibited the removal of POPs to some extent: media adsorption, mineralization and plant uptake were reduced by 4.3-6.4%, 1.8-8.3% and 1.5-3.6% respectively. This study suggests that bioretention systems are an effective measure for the sustainable removal of POPs from stormwater and that heavy metals can inhibit the overall performance of the system. Stable carbon isotope analysis techniques can help to investigate the migration and transformation of POPs in bioretention systems.
目前缺乏量化生物滞留系统中持久性有机污染物（POPs）命运过程的简单有效方法。本研究采用稳定碳同位素分析技术，定量研究了定期添加的生物滞留柱中三种典型 C 标记 POPs 的命运和去除过程。结果表明，改性介质生物滞留柱去除了超过 90%的芘、PCB169 和 p,p'-DDT。尽管植物吸收（5.9-18.0%）也很重要，但介质吸附是三种外源性有机化合物（输入的 59.1-71.8%）减少的主要去除机制。矿化在降解芘方面非常有效（13.1%），但对 p,p'-DDT 和 PCB169 的去除影响很小（<2.0%），原因可能与过滤柱中的好氧条件有关。挥发作用相对较弱且可以忽略不计（<1.5%）。重金属的存在在一定程度上抑制了 POPs 的去除：介质吸附、矿化和植物吸收分别减少了 4.3-6.4%、1.8-8.3%和 1.5-3.6%。本研究表明，生物滞留系统是从雨水去除 POPs 的有效措施，重金属会抑制系统的整体性能。稳定碳同位素分析技术可用于研究 POPs 在生物滞留系统中的迁移转化。
