生物滞留系统去除城市地表径流中多环芳烃的研究进展

低影响开发(LID)生物滞留系统是净化城市地表径流的重要措施。多环芳烃(PAHs)作为难降解有机污染物,是城市雨水径流中的重要成分之一。通过总结城市地表径流中PAHs污染现状和国内外应用生物滞留系统去除PAHs的研究动态,系统分析了PAHs类污染物的去除机理、效果和影响因素。研究结果表明:生物滞留系统主要通过填料吸附、微生物降解、植物吸收、挥发等作用去除PAHs,平均去除率在30%~90%。影响去除效果的主要因素包括PAHs性质、系统组成与设计、微生物及环境因子等。建议关注生物滞留系统中PAHs的积累和长期运行效果,并开展系统优化设计和作用机制研究工作。

Advance on removal of polycyclic aromatic hydrocarbon by bioretention system in urban surface runoff

The bioretention system of low impact development (LID) is an important measure in the purification of urban surface runoff. As refractory organic pollutant, polycyclic aromatic hydrocarbon (PAHs) is one of the important components in urban stormwater runoff.By summarizing the contamination status of PAHs and research progress in the PAHs removal by bioretention system, the paper systematically analyzed the mechanism, effect and impact factors of PAHs removal. The result indicated that the bioretention system removes PAHs by main ways of adsorption, microbial degradation, plant uptake, and volatilization, etc. with the average removal rate of 30%~90%.The factors affecting the removal efficiency mainly include the nature of PAHs, system composition and design, microbial community and environmental factor.The paper suggested to focus on the PAHs accumulation and long-term operation of bioretention system and carry out further study on system optimization and mechanism.