土壤中多氯联苯的迁移转化机理研究
发布时间：2019-04-22 09:34
【摘要】：多氯联苯,简称PCBs,定义为联苯苯环上的氢被氯取代而形成的多氯化合物。多氯联苯(PCBs)属于环境中的持久性有机污染物(POPs)之一,由于其存在对人类和自然环境的严重危害,而日益受到人们的关注和重视。本文首先分析了多氯联苯在土壤中的吸附/解吸行为,认为土壤中影响多氯联苯吸附的主要影响因子为土壤中有机质含量和土壤颗粒大小。在此基础上,进行了土柱淋溶实验,模拟多氯联苯在包气带中,随水下渗的动态过程,研究不同水力条件及土壤理化性质等条件下,多氯联苯在包气带中的吸附、弥散和迁移的行为。结果表明,多氯联苯在土壤中的迁移很缓慢,随着有机质含量的增加,多氯联苯的迁移情况变弱,迁移更加缓慢;在不同水力条件下,由于水的下渗作用,给多氯联苯的迁移提供了驱动力,当水流速度增大时,多氯联苯向深层土壤迁移速度变快,迁移深度也相对增加;多氯联苯的迁移和土壤中有机质含量的高低呈一定的正相关关系,与水力条件的大小也呈一定的正相关关系。在实验的基础上,建立了PCBs在土壤包气带中的迁移模型,模型较好的反映了PCBs在土壤中的迁移规律。最后探讨了PCBs在土壤中的转化方式,将微生物的代谢作为PCBs的主要转化方式,其中,温度和土壤中包含的电子供体和电子受体是影响PCBs转化的主要影响因素。
[Abstract]:Polychlorinated biphenyls (PCBs), called PCBs, are defined as polychlorinated compounds formed by the substitution of the hydrogen on the biphenyl benzene ring with chlorine. Polychlorinated biphenyls (PCBs) are one of the persistent organic pollutants (POPs) in the environment. In this paper, the adsorption/ desorption behavior of polychlorinated biphenyls (PCBs) in the soil is analyzed firstly, and the main influencing factors that influence the adsorption of polychlorinated biphenyls in the soil are the organic matter content and the soil particle size in the soil. The adsorption, dispersion and migration of polychlorinated biphenyls (PCBs) in the gas-containing zone under the conditions of different hydraulic conditions and physical and chemical properties were studied. The results show that the migration of polychlorinated biphenyls in the soil is very slow, with the increase of the organic matter content, the migration of the polychlorinated biphenyls is weakened and the migration is more slow; under different hydraulic conditions, the migration of the polychlorinated biphenyls provides a driving force for the migration of the polychlorinated biphenyls, When the velocity of the water flow is increased, the migration velocity of the polychlorinated biphenyls to the deep soil is fast, and the migration depth is also relatively increased; the migration of the polychlorinated biphenyls and the content of the organic matter in the soil are positively related, and the size of the hydraulic conditions is also positively related. On the basis of the experiment, the migration model of the PCBs in the soil-wrapped gas belt is established, and the migration law of the PCBs in the soil is better reflected. In the end, the transformation of the PCBs in the soil is discussed, and the metabolism of the microorganisms is used as the main conversion mode of the PCBs. The temperature and the electron donor and the electron acceptor included in the soil are the main influencing factors that affect the conversion of the PCBs.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X53
本文编号：2462726
[Abstract]:Polychlorinated biphenyls (PCBs), called PCBs, are defined as polychlorinated compounds formed by the substitution of the hydrogen on the biphenyl benzene ring with chlorine. Polychlorinated biphenyls (PCBs) are one of the persistent organic pollutants (POPs) in the environment. In this paper, the adsorption/ desorption behavior of polychlorinated biphenyls (PCBs) in the soil is analyzed firstly, and the main influencing factors that influence the adsorption of polychlorinated biphenyls in the soil are the organic matter content and the soil particle size in the soil. The adsorption, dispersion and migration of polychlorinated biphenyls (PCBs) in the gas-containing zone under the conditions of different hydraulic conditions and physical and chemical properties were studied. The results show that the migration of polychlorinated biphenyls in the soil is very slow, with the increase of the organic matter content, the migration of the polychlorinated biphenyls is weakened and the migration is more slow; under different hydraulic conditions, the migration of the polychlorinated biphenyls provides a driving force for the migration of the polychlorinated biphenyls, When the velocity of the water flow is increased, the migration velocity of the polychlorinated biphenyls to the deep soil is fast, and the migration depth is also relatively increased; the migration of the polychlorinated biphenyls and the content of the organic matter in the soil are positively related, and the size of the hydraulic conditions is also positively related. On the basis of the experiment, the migration model of the PCBs in the soil-wrapped gas belt is established, and the migration law of the PCBs in the soil is better reflected. In the end, the transformation of the PCBs in the soil is discussed, and the metabolism of the microorganisms is used as the main conversion mode of the PCBs. The temperature and the electron donor and the electron acceptor included in the soil are the main influencing factors that affect the conversion of the PCBs.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X53
【引证文献】
相关硕士学位论文 前1条
1 欧阳卓智;变化生境下土壤—底泥POPs柱状分层比较研究[D];安徽理工大学;2017年
，本文编号：2462726
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