Stormwater runoff from urban and suburban areas can carry hazardous pollutants directly into aquatic ecosystems. These pollutants, such as metals, nutrients, aromatic hydrocarbons, pesticides, and pharmaceuticals, are very toxic to aquatic organisms. Recently, significant amounts of zinc oxide engineered nanoparticles (ZnO-NPs) have been detected in urban stormwater and its bioretention systems. This raises concerns about a potential increase of stormwater toxicity and reduced performance of the treatment infrastructures. To tackle these issues, we developed a simple, low-cost bioretention system to remediate stormwater and retain ZnO-NPs. This system retained up to 73% Zn, 66% Cu, and >99% Pb. However, the removal efficiency for Pb was lower after adding ZnO-NPs to the system, possibly due to the remobilization of Pb phosphates. The effect of ZnO-NPs on stormwater toxicity and metal accumulation in wetland plants was also evaluated.

来自城市和郊区的雨水径流可以将有害污染物直接带入水生生态系统。这些污染物，如金属、营养物质、芳香烃、杀虫剂和药物，对水生生物的毒性很大。最近，在城市雨水及其生物滞留系统中检测到大量氧化锌工程纳米粒子（ZnO-NPs）。这引起了人们对雨水毒性可能增加和处理基础设施性能降低的担忧。为了解决这些问题，我们开发了一种简单、低成本的生物保留系统来修复雨水并保留 ZnO-NP。该系统保留了高达 73% 的锌、66% 的铜和 >99% 的铅。然而，在系统中加入 ZnO-NPs 后，Pb 的去除效率较低，这可能是由于 Pb 磷酸盐的再迁移。