农药污染场地修复过程中近地面大气气态污染物含量变化特征及影响因素

发布时间：2018-06-04 17:08

本文选题：农药场地 + 修复过程　；参考：《南京农业大学学报》2017年03期

【摘要】：[目的]研究农药污染场地修复施工过程中大气中污染物的含量变化,揭示其主要影响因子和变化规律,为农药类污染场地修复过程中的大气二次污染防治提供科学依据。[方法]以典型农药化工类退役场地土壤修复工程为依托,基于对场地土壤污染和修复施工工程的综合分析,在整个施工期间,对场地大气进行采样检测,采用相关分析和回归分析等统计学方法,对场地大气中气态污染物的组成和含量变化及其影响因素等进行了研究。[结果]场地大气中主要气态污染物包括苯乙烯、甲苯、乙苯、二氟二氯甲烷、氯仿、1,4-二氯苯、1,3-二氯苯、氯代甲苯、环己烷、乙酸乙酯、2-丁酮和二硫化碳等挥发性有机污染物(VOCs)。场地大气气态污染物含量在修复后期(2014年6月至2015年1月)明显高于修复前期(2014年1—6月)。[结论]修复施工期内污染土壤的开挖量是影响污染物浓度变化的关键因子,阶段开挖土方量对污染物浓度变化的影响尤为显著,开挖土方量越大,污染物浓度越高;气温和风速也是影响污染物浓度变化的主要因素。气温越高,风速越小,污染物浓度越高。
[Abstract]:[objective] to study the changes of atmospheric pollutants in the process of remediation of pesticide contaminated sites, and to reveal its main influencing factors and changing rules, so as to provide a scientific basis for the prevention and control of secondary atmospheric pollution in the remediation of pesticide contaminated sites. [methods] based on the comprehensive analysis of soil pollution and remediation engineering of typical pesticide and chemical retired sites, the site atmosphere was sampled and detected during the whole construction period. By means of correlation analysis and regression analysis, the composition and content of gaseous pollutants in the atmosphere and their influencing factors were studied. [results] the main gaseous pollutants in the atmosphere of the site included styrene, toluene, ethylbenzene, dichloromethane, chloroform 1, 4-dichlorobenzene, chlorotoluene, cyclohexane, ethyl acetate 2-butanone and carbon disulfide, and so on. The content of gaseous pollutants in the site was significantly higher in the later stage of restoration (June 2014 to January 2015) than in the early period of restoration (January-June 2014). [conclusion] the excavation amount of contaminated soil is the key factor affecting the change of pollutant concentration during the period of remediation, and the effect of excavation earthwork on the change of pollutant concentration is particularly significant. The larger the earthwork quantity is, the higher the pollutant concentration is. Air temperature and wind speed are also the main factors affecting the concentration of pollutants. The higher the temperature, the smaller the wind speed and the higher the pollutant concentration.
【作者单位】：南京农业大学资源与环境科学学院;环境保护部南京环境科学研究所;中国科学院植物研究所;
【基金】：环保公益性行业科研专项(201509034)
【分类号】：X592

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