北运河流域(北京段)多环芳烃的空间分布和逸度模拟
发布时间:2018-11-11 15:43
【摘要】:多介质环境逸度模型是研究污染物的环境行为的数学模型,可以有效的定量分析污染物的迁移转化和归趋规律。本研究利用气相色谱质谱法(GC-MS),分析北运河流域(北京段)旱雨两季的地表水、悬浮物及沉积物的多环芳烃的含量水平,组成特征,季节变化和来源解析,并应用Ⅲ级多介质环境模型,研究北运河流域(北京段)典型多环芳烃的多介质环境行为。北运河流域(北京段)地表水和悬浮物中PAHs的分布呈现季节变化,雨季含量高于旱季。旱季水体中PAHs的平均含量为0.17μg/L,悬浮物中PAHs的平均含量为0.15μg/L。雨季水体中PAHs的平均含量为0.43μg/L,悬浮物中PAHs的平均含量为0.24μg/L。沉积物中PAHs的平均含量为1000.70ng/g。在组成上,三环和四环的PAHs所占比重很大。调查北运河流域(北京段)2013年的居民燃煤量,工业燃煤量、工业燃油量,秸秆燃烧量和机动车行驶公里数,收集不同燃料使用过程的PAHs的排放因子,得到PAHs排放量的主要贡献。通过比值法及主因子分析法,定性解析研究区域PAHs的来源,并通过排放因子法,定量计算得出PAHs的主要来源:煤燃烧,交通源和生物质燃烧。模拟北运河流域(北京段)典型PAHs的浓度分布和归趋。以估算的PAHs的排放量为模型的输入值,按照输入输出平衡原理,建立Ⅲ级逸度模型。模型分为大气、水、土壤、沉积物四个环境相,计算典型PAHs的在各环境相中的浓度分布,水相中PAHs的实测值和模拟值相差1个对数单位之内,沉积物相中PAHs的实测值和模拟值略高于1个对数单位,拟合结果较好,结果显示土壤和沉积物是PAHs最主要的汇。模拟典型PAHs的相间迁移行为,计算相间迁移通量,结果显示典型PAHs在环境中主要的迁移过程是:大气—土壤迁移,水—沉积物迁移,大气—水迁移,主要的迁出方式是降解。灵敏度分析,得到影响污染物浓度的主要因素。并对研究区PAHs的浓度进行多年预测,得到水相和沉积物相中PAHs的浓度趋势。对北运河流域地表水和沉积物PAHs的多年预测浓度进行风险评价,水体中的风险较小,沉积物中存在一定风险。
[Abstract]:Multi-medium environmental fugacity model is a mathematical model to study the environmental behavior of pollutants, which can be used to quantitatively analyze the migration, transformation and fate of pollutants. In this study, gas chromatography-mass spectrometry (GC-MS) was used to analyze the polycyclic aromatic hydrocarbons (PAHs) content, composition, seasonal variation and source of surface water, suspended solids and sediments in the North Canal Basin (Beijing section). The environmental behavior of typical polycyclic aromatic hydrocarbons (PAHs) in the North Canal Basin (Beijing Section) was studied by using the class 鈪,
本文编号:2325321
[Abstract]:Multi-medium environmental fugacity model is a mathematical model to study the environmental behavior of pollutants, which can be used to quantitatively analyze the migration, transformation and fate of pollutants. In this study, gas chromatography-mass spectrometry (GC-MS) was used to analyze the polycyclic aromatic hydrocarbons (PAHs) content, composition, seasonal variation and source of surface water, suspended solids and sediments in the North Canal Basin (Beijing section). The environmental behavior of typical polycyclic aromatic hydrocarbons (PAHs) in the North Canal Basin (Beijing Section) was studied by using the class 鈪,
本文编号:2325321
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