采煤沉陷区DOM对PAHs的环境行为影响研究

发布时间：2018-05-07 14:58

  本文选题：多环芳烃 + 溶解性有机质　； 参考：《安徽理工大学》2017年硕士论文

【摘要】：本文以淮南潘一杨庄采煤沉陷区和谢桥采煤沉陷区为研究对象,通过实地勘察采样、样品指标检测及数据分析,对沉陷区水体、周围土壤及沉陷区底泥中16种优先控制的PAHs进行定性和定量分析,查明沉陷区多环境介质中PAHs的含量和污染特征、研究各样品中DOM的含量并简单分析其组分种类、探讨变化生境下采煤沉陷区DOM对PAHs环境行为的影响。主要结论如下:1.杨庄采煤沉陷区水样中PAHs总含量范围为79.72-205.70 ng/L,平均含量142.31 ng/L,土壤中 PAHs 总含量范围为 109.00-6540.64 ng/g,平均含量 1191.88 ng/g,底泥中PAHs总含量范围为60.67-5460.57 ng/g,平均含量1145.07 ng/g;谢桥采煤沉陷区水样中PAHs总含量范围为123.27-194.79 ng/L,平均含量158.14 ng/L,土壤中PAHs总含量范围为26.58-1597.87 ng/g,平均含量267.37 ng/g,底泥中PAHs总含量范围为44.64-180.49 ng/g,平均含量99.06 ng/g。2.杨庄采煤沉陷区PAHs分布特征为:水和底泥中沉陷区西面和北面PAHs总含量较高,由西往东有下降的趋势,沉陷区西北方向土壤中的PAHs含量较高,以YZTR12为中心向两边有下降的趋势;谢桥采煤沉陷区PAHs分布特征为:水和底泥中沉陷区南面PAHs总含量较高,由南向北有下降的趋势,沉陷区北面土壤中PAHs分布较均匀,含量较低。3.杨庄采煤沉陷区水样中DOM含量范围为4.29-5.60 mg/L,平均含量4.85 mg/L,由西北向东南呈逐渐下降的趋势,可能与煤矸石堆的分布有关;谢桥水样DOM含量范围为2.94-6.53 mg/L,平均含量5.21 mg/L,其含量呈现南高北低的规律,主要原因是沉陷区南侧有多家燃煤烧砖厂。4.杨庄、谢桥两个采煤沉陷区土壤中PAHs含量较高的样品,其对应DOM的主要出峰位置在区域Ⅰ或Ⅲ,属于类蛋白质物质,PAHs含量较低的样品,其对应DOM的主要出峰位置在区域Ⅱ或Ⅳ,属于类腐殖质物质;但在底泥中,呈现相反的规律,PAHs含量较高的样品,其对应DOM的主要出峰位置在区域Ⅱ或Ⅳ,PAHs含量较低的样品,其对应DOM的主要出峰位置在区域Ⅰ或Ⅲ。5.杨庄、谢桥两个采煤沉陷水样中PAHs与DOM的分布特征及其相似,可能原因是DOM与PAHs以共吸附或累积吸附的形式被水体介质吸附,从而增加PAHs在水体中的吸附容量,降低PAHs在水体中的迁移性;在土壤中,类腐殖质物质对PAHs有增溶作用,能促进PAHs解吸,提高其在土壤中的迁移性;而在底泥中,类腐殖质物质能促进DOM与PAHs以共吸附或累积吸附的形式被底泥介质吸附,从而增加PAHs在底泥中的吸附容量,降低PAHs在底泥中的迁移性。
[Abstract]:This paper takes Pan-Yangzhuang coal mining subsidence area in Huainan and Xieqiao coal mining subsidence area as the research object, through on-the-spot investigation and sampling, sample index detection and data analysis, the water body in the subsidence area is analyzed. Sixteen preferentially controlled PAHs in surrounding soil and sediment were qualitatively and quantitatively analyzed to find out the content and pollution characteristics of PAHs in multi-environmental media of subsidence area, to study the content of DOM in each sample and to analyze its components. The effect of DOM on the environmental behavior of PAHs in coal mining subsidence area under changing habitat was studied. The main conclusions are as follows: 1. The total content of PAHs in water of Yangzhuang coal mining subsidence area is 79.72-205.70 ng / L, the average content is 142.31 ng / L, the total content of PAHs in soil is 109.00-6540.64 ng / g, the average content of PAHs is 1191.88 ng / g, the total content of PAHs in sediment is 60.67-5460.57 ng / g, the average content is 1145.07 ng / g; The total content of PAHs was 123.27-194.79 ng / L, the average content was 158.14 ng / L, the total content of PAHs in soil was 26.58-1597.87 ng / g, the average content was 267.37 ng / g, and the total content of PAHs in sediment was 44.64-180.49 ng / g, with an average content of 99.06 ng / g 路2. The distribution characteristics of PAHs in Yangzhuang coal mining subsidence area are as follows: the total content of PAHs in the west and north of the subsidence area in water and sediment is relatively high, and the content of PAHs in the soil in the northwestern direction of the subsidence area is higher, with the YZTR12 as the center and on both sides. The distribution characteristics of PAHs in the coal mining subsidence area of Xieqiao are as follows: the total PAHs content in the south side of the subsidence area in water and sediment is relatively high, and the content of PAHs in the soil in the north of the subsidence area is more uniform, and the content of PAHs is lower than that in the north side of the subsidence area, with a decreasing trend from the south to the north. The content of DOM in the water samples of Yangzhuang coal mining subsidence area ranges from 4.29-5.60 mg / L, and the average content is 4.85 mg / L, which may be related to the distribution of coal gangue. The range of DOM content in water samples of Xieqiao is 2.94-6.53 mg / L, with an average content of 5.21 mg / L. The main reason is that there are many coal-fired brick plants in the south of the subsidence area. The samples with high PAHs content in two coal mining subsidence areas of Yangzhuang and Xieqiao, which correspond to the main peak location of DOM in region 鈪，

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