重金属污染场地风险评估及修复技术研究

发布时间：2018-09-04 12:37

【摘要】：本文在对苏州工业园区某重金属污染场地取样分析,通过数据分析土壤的污染状况,并对该场地展开健康风险评估,在针对具体重金属镍污染开展不同的修复实验,通过实验结果再结合土壤、时间、成本等因素得出一个可行的修复方案。主要研究内容如下:(1)对该重金属污染场地结合各方面的背景状况进行调查,结从该项目的原有生产工艺、所使用的原辅材料和先前做的土壤和地下水场地环境评估初步断定该场地的污染物为重金属镍,根据原企业的生产工艺和生产车间布局,确定该场地潜在的重金属镍污染重点关注区域。(2)对潜在的重金属镍污染区域与对照区域等分别采样,采用ICP-OES测定其重金属镍的含量,并测定p H值。经过对实验结果分析,在八个样品中有三个重金属镍含量均超过了《建设用地土壤污染风险筛选指导值》(二次征求意见稿)中工业类用地的风险筛选指导值(198mg/Kg),其中一个点位的镍含量达到600mg/Kg。(3)选择重金属镍作为关注污染物,进一步评估其健康风险,评估方法参考《污染场地风险评估技术导则》。以检测结果的最大值计算该场地的风险,通过计算得出该场地土壤中镍的致癌风险和危害商分别高于标准值,因此需要对该场地土壤作进一步的修复治理。(4)尝试通过淋洗修复技术、固化稳定化修复技术和植物修复技术三种不同方法对目标土壤进行修复,通过不同的实验组合得出最佳实验方案,最后通过实验结果计算出三种不同的修复方案的修复结果。(5)通过对实验结果的分析,可以看出上述三种实验方法在对于重金属镍污染的土壤都能起到较理想的效果。最后结合成本、时间等因素,参考《污染场地修复技术目录》,确定固化稳定化修复技术比较适合该类型土壤的修复。
[Abstract]:In this paper, the heavy metal pollution site of Suzhou Industrial Park is sampled and analyzed, the soil pollution status is analyzed by data, and the health risk assessment of the site is carried out, and different remediation experiments are carried out aiming at the specific heavy metal nickel pollution. A feasible remediation scheme was obtained by combining the experimental results with soil, time, cost and other factors. The main research contents are as follows: (1) the background condition of the heavy metal contaminated site combined with various aspects is investigated, and the original production process of the project is concluded. The environmental assessment of the raw and auxiliary materials used and the previously done soil and groundwater sites preliminarily concluded that the pollutants in the site were heavy metal nickel, according to the production process and workshop layout of the original enterprise, (2) the potential heavy metal nickel pollution area and control area were sampled, and the nickel content and pH value were determined by ICP-OES. After analyzing the experimental results, Three of the eight samples contain more heavy metal nickel than the Industrial Land risk screening guideline (198mg/Kg) in the soil pollution risk screening guidelines for Construction Land (second draft), one of which has nickel content of up to one point. By 600 mg / Kg. (3) choose nickel as a concern pollutant, Further assessment of their health risks, assessment methods refer to the pollution site risk assessment technical guidelines. The maximum value of the test results is used to calculate the risk of the site. The results show that the carcinogenic risk and hazard quotient of nickel in the soil of the site are higher than the standard value respectively. Therefore, it is necessary to make further remediation of the site soil. (4) try to repair the target soil by three different methods: elution, stabilization and phytoremediation. Through different experimental combinations, the best experimental scheme is obtained. Finally, the results of three different restoration schemes are calculated through the experimental results. (5) through the analysis of the experimental results, It can be seen that the above three experimental methods can play an ideal effect on the heavy metal nickel contaminated soil. Finally, with the consideration of cost, time and other factors, and referring to the catalogue of remediation techniques for contaminated sites, it is determined that the solidified and stabilized remediation technology is more suitable for the remediation of this type of soil.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X820.4;X505

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