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首页> 外文期刊>The Science of the Total Environment >Remediation and accumulation characteristics of dissolved pollutants for stormwater in improved bioretention basins
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Remediation and accumulation characteristics of dissolved pollutants for stormwater in improved bioretention basins

机译：改良型生物保留盆地中雨水溶解污染物的修复和累积特征

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Dissolved pollutants in stormwater are more mobile/bioavallable, and are captured via different mechanisms than particles. Column-scale bioretention basins are constructed by filling different media, which is used to study the remediation and accumulation characteristics of dissolved pollutants by improved bioretention basins (increased infiltration and adsorption capacity of the media). The media factor (ratio of specific surface area to cubic of porosity) is used to characterize the basic properties of different media, while considering the key factors: infiltration capacity, inflow concentration, recurrence interval, discharge ratio, antecedent dry period, and rainfall duration. The results showed that stormwater pollutants load reduction rate decreased with the increase of recurrence interval and discharge ratio, and increased with the increase of inflow concentration. Based on response surface methodology (RSM), a quantitative relationship model between major pollutants and influencing factors were established (R-2 0.715), which can be used to estimate the design and operation of the media. By detecting changes in media carbon, nitrogen and phosphorus contents, the results showed that partial pollutants leaching were greater than their accumulation in the initial stage of system operation, and their contents in the media reduced during simulated rainfall. After the pollution contents tend to stabilize, the accumulated pollutants were greater than the leaching, and media pollution contents showed the trend of upper middle lower (corresponding to the 10, 35, and 60 cm sections of the media from top to bottom). Six enzymes closely related to the accumulation and migration of nitrogen, phosphorus and organic matter in the media were selected. Pearson correlation analysis found that: the significant correlations between the selected enzyme activity and pollutants were not consistent in bioretention system. For example, catalase was significantly correlated with all the pollutants (P 0.01), whereas acid phosphatase was not significantly correlated with all the pollutants. (C) 2019 Elsevier B.V. All rights reserved.
机译：雨水中溶解的污染物更具流动性/生物利用度，并且通过与颗粒相比不同的机制捕获。柱级生物滞留池是通过填充不同的介质而构建的，用于研究通过改进的生物滞留池对溶解污染物的修复和累积特性（增加了介质的渗透和吸附能力）。介质因子（比表面积与孔隙立方的比率）用于表征不同介质的基本特性，同时考虑以下关键因素：入渗能力，入流浓度，复发间隔，排放比，前期干燥期和降雨持续时间。结果表明，雨水污染物减载率随重复间隔和排放比的增加而降低，随入水浓度的增加而增加。基于响应面法（RSM），建立了主要污染物与影响因素的定量关系模型（R-2> 0.715），可用于估算介质的设计和运行。通过检测介质中碳，氮和磷含量的变化，结果表明，部分污染物的浸出大于系统运行初期的累积，在模拟降雨期间，介质中的污染物含量降低。污染含量趋于稳定后，污染物的累积量大于浸出量，介质污染含量呈上>中>下的趋势（对应于介质从上到下的10、35和60 cm截面） 。选择了与氮，磷和有机质在培养基中的积累和迁移密切相关的六种酶。皮尔逊相关分析发现：在生物保留系统中，选定的酶活性与污染物之间的显着相关性不一致。例如，过氧化氢酶与所有污染物均显着相关（P <0.01），而酸性磷酸酶与所有污染物均不显着相关。 （C）2019 Elsevier B.V.保留所有权利。

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