中文关键词生物滞留系统降雨径流水质溶解性有机物三维荧光 英文关键词bioretention cellsrainfall runoffwater qualitydissolved organic matters (DOMs)three-dimensional fluorescence

作者	单位	E-mail
林修咏	重庆市环境材料与修复技术重点实验室, 永川 402160 福州大学土木工程学院, 福州 350116	anuoxx@qq.com
王书敏	重庆市环境材料与修复技术重点实验室, 永川 402160 福州大学土木工程学院, 福州 350116	wangshumin5103@sina.com
李强	重庆市环境材料与修复技术重点实验室, 永川 402160
谢云成	重庆市环境材料与修复技术重点实验室, 永川 402160

中文摘要 构建了两套防渗型生物滞留中试系统，在2017年3~4月期间，跟踪监测了系统在低温小强度降雨条件下的径流水质特点，并同步分析了降雨径流的三维荧光光谱特征.系统降雨径流水质监测结果表明，经系统净化后，出水污染物浓度波动较小，对NH₄⁺-N和TP均有相对稳定的去除效率，可分别达到78.38%~95.03%和72.04%~76.04%.荧光光谱特征分析表明，生物滞留系统出水中的主要溶解性有机物（dissolved organic matters，DOMs）为蛋白类物质和类腐殖质物质，主要来自生物或水生细菌代谢物；系统对于Ⅰ区、Ⅱ区蛋白类荧光有机物和类富里酸具有较好的去除效果，去除率可分别达到57.33%~61.30%、29.82%~31.28%和35.55%~43.16%.径流水质与DOMs相关性分析表明，系统径流出水中的TN、TP和TOC均与芳香类蛋白质含量呈显著正相关关系，而NO₃^--N和NH₄⁺-N与芳香类蛋白质含量呈显著负相关关系；TN浓度均与Ⅳ区DOMs （微生物代谢产物）和V区DOMs （类胡敏酸）呈显著负相关关系. 英文摘要 Bioretention cells have become one of the most popular devices in urban stormwater runoff management for their high efficiency in reducing runoff volume and pollution loads. However, bioretention cells are unstable in nutrient pollutant removal, as is verified by many cases, especially at low temperatures. Dissolved organic matters (DOMs) plays an important role in denitrification, but the three-dimensional fluorescence characteristics of stormwater runoff in bioretention field cells are poorly understood, so to improve the performance of bioretention cells in nutrient pollutants control, the authors determined that it was necessary to clarify the characteristics of three-dimensional fluorescence of stormwater runoff from bioretention cells and explain their relationship to water quality. To be applicable to urban landuse in mountainous cities, two field lined bioretention cells were constructed, and, from March to April in 2017, while temperatures were still low, water quality and three-dimensional fluorescence of stormwater runoff were analyzed during low rainfall intensity precipitation events. Analysis results showed that the effluent pollutant concentrations had low fluctuation after purification by the bioretention cells, and both cells showed relatively stable removal rates for NH₄⁺-N and total phosphorus (TP; i. e., 78.38%-95.03% and 72.04%-76.04%, respectively). Analysis of fluorescence spectra showed that the DOMs in the runoff from the two cells was mostly made up of protein and humic substances, mainly of biological origin or aquatic bacterial metabolites. Both cells performed well in the removal of protein at I, protein at Ⅱ and fulvic acid (i. e., the removal rates could reach 57.33%-61.30%, 29.82%-31.28%, and 35.55%-43.16% respectively). Correlation analyses between water quality and DOM showed that total Nitrogen (TN), TP and total organic carbon (TOC) were positively correlated with the protein content in runoff from the biorentention cells, while NO₃^--N and NH₄⁺-N were negatively correlated with protein content. Meanwhile, TN was negatively correlated with DOMs in regions Ⅳ and Ⅴ of the cells.

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