Urban Water Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, Sweden; NCC Sverige AB, Department of Research & Innovation, 170 80 Solna, Sweden.
Urban Water Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, Sweden.
Sci Total Environ. 2022 Nov 10;846:157372. doi: 10.1016/j.scitotenv.2022.157372. Epub 2022 Jul 16.
The increased use of bioretention facilities as a low impact development measure for treating stormwater runoff underscores the need to further understand their long-term function. Eventually, bioretention filter media must be (partly) replaced and disposed of at the end of its functional lifespan. While there are several studies of metal accumulation and distributions in bioretention media, less is known about organic pollutant pathways and accumulation in these filters. The present study considers the occurrence and accumulation of 16 polycyclic aromatic hydrocarbons, 7 polychlorinated biphenyls, 13 phthalates, and two alkylphenols throughout 12 older bioretention facilities (7-13 years old) used for stormwater treatment in Michigan and Ohio, USA. These pollutant groups appear to behave similarly, with greater instances of detection and higher concentrations in the upper media layers which decrease with increased depth from the surface. The patterns of detection and concentration in the filter material may be explained by characteristics of the pollutants, such as molecular structures and solubility that affect the removal of the organic pollutants by the filter material. There is also a large variation in concentration magnitudes between the bioretention sites, most likely due to differences in pollutant sources, contributing catchment size and/or land uses.
随着生物滞留设施作为一种低影响开发措施来处理雨水径流的使用越来越多，人们更加需要深入了解其长期功能。最终，生物滞留过滤介质必须（部分）更换，并在其功能寿命结束时进行处理。尽管有一些关于生物滞留介质中金属积累和分布的研究，但对于这些过滤器中有机污染物的途径和积累知之甚少。本研究考虑了在美国密歇根州和俄亥俄州用于雨水处理的 12 个较老的生物滞留设施（使用了 7-13 年）中 16 种多环芳烃、7 种多氯联苯、13 种邻苯二甲酸酯和 2 种烷基酚的存在和积累。这些污染物群体似乎表现出相似的行为，在上层介质中检测到的实例更多，浓度更高，并且随着离表面深度的增加而降低。过滤器材料中污染物的检测和浓度模式可以用污染物的特性来解释，例如分子结构和溶解度，这些特性会影响过滤器材料对有机污染物的去除。各个生物滞留点之间的浓度差异也很大，这很可能是由于污染物来源、集水区大小和/或土地利用的差异造成的。
