Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 102616, China; Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China.
Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 102616, China; Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China.
J Environ Manage. 2024 Oct;369:122383. doi: 10.1016/j.jenvman.2024.122383. Epub 2024 Sep 3.
Biochar has been proved as a promising and efficient filler in bioretention facilities for enhancing the stormwater pollutants removal. However, the migration behaviors of stormwater pollutants in biochar filled bioretention facilities is unclear. In this study, as one of the most typical stormwater pollutants, naphthalene was selected as an example and a HYDRUS-1D model was first used to understand the migration behavior of naphthalene in a bioretention facility. In comparison with the conventional bioretention soil media (sandy loam), the amended biochar filled bioretention cell showed that the naphthalene removal rate was enhanced by up to 10.1%. Meanwhile, the experimental data was well-fitted by the "two-site sorption model" in HYDRUS-1D model. Another, the effect of rainfall intensity on the naphthalene migration in both bioretention columns was further investigated. The HYDRUS-1D model fitting indicated that the increase in rainfall intensity promoted naphthalene migration by increasing hydraulic conductivity and water flux. In addition, static batch experiments revealed that the biochar filled fillers achieved about 50% higher adsorption capacity than sandy loam. The sensitivity analysis from the HYDRUS-1D model data verified adsorption coefficient K and longitudinal dispersivity λ are the main factors affecting naphthalene migration. Finally, the model simulation displays that the proportion of naphthalene retained by the fillers was highest during high rainfall intensities, indicating that the fillers remain the most important fate for naphthalene. This study presents research on the behavior and mechanisms of stormwater pollutant transport through improved bioretention facilities.
生物炭已被证明是一种很有前途且高效的填料，可用于增强雨水污染物去除功能的生物滞留设施中。然而，雨水污染物在填充生物炭的生物滞留设施中的迁移行为仍不清楚。在这项研究中，萘作为最典型的雨水污染物之一被选为研究对象，并首次使用 HYDRUS-1D 模型来了解萘在生物滞留设施中的迁移行为。与传统的生物滞留土壤介质（砂壤土）相比，改良的生物炭填充生物滞留单元显示出萘的去除率提高了 10.1%。同时，HYDRUS-1D 模型中的“双位点吸附模型”很好地拟合了实验数据。此外，还进一步研究了雨强对两种生物滞留柱中萘迁移的影响。HYDRUS-1D 模型拟合表明，雨强的增加通过增加水力传导率和水通量来促进萘的迁移。此外，静态批量实验表明，填充生物炭的填料比砂壤土的吸附容量高约 50%。HYDRUS-1D 模型数据的敏感性分析验证了吸附系数 K 和纵向弥散度 λ 是影响萘迁移的主要因素。最后，模型模拟显示，在高雨强下，填料保留的萘比例最高，这表明填料仍然是萘的最重要归宿。本研究对改进后的生物滞留设施中雨水污染物传输的行为和机制进行了研究。
