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    某污染地块合成麝香在土壤中的分布特性及修复技术研究

    Study on Distribution Characteristics and Remediation Technology of Synthetic Musk in the Contaminated Site

    • 摘要: 合成麝香(Synthetic Musks,SMs)是一类在环境中难降解、易产生生物蓄积作用的半挥发性有机污染物,可通过各种环境介质迁移转化,已严重威胁到生态系统安全及人体健康.对于SMs去除途径的研究目前主要聚焦在水处理领域,土壤治理方面鲜有报道.本研究对国内某污染地块SMs在土层中的空间分布及富集特征开展分析,发现SMs在水平方向上高浓度污染源的迁移能力更强,而在垂向上呈现先增加后减少、并在粉质黏土层富集的现象.选取化学氧化、异位热脱附、水泥窑协同处置3种代表性修复技术,通过试验探索SMs污染土壤修复技术的关键工艺参数.研究结果表明,部分SMs可以被化学氧化,但氧化后的浓度仍高于以检出限0.1mg/kg确定的“风险控制值”;SMs热脱附效率随加热温度的升高呈先显著增加、后趋于平稳,持续升温在提升修复效果的同时会造成经济成本的增加;水泥窑协同处置技术是确保SMs污染土壤修复达标、且实现资源化利用的一种有效途径.最后,结合目前SMs污染物尚无法律法规和标准予以规定的现状,对检测方法、风险评估方法、治理模式提出了展望.

       

      Abstract: Synthetic musk can migrate and transform through various environmental media.It is a type of semi-volatile organic pollutant that is difficult to degrade in the environment and prone to bioaccumulation,which has seriously threatened the safety of the ecological system and human health.Current research on synthetic musk removal mainly focuses on water treatment,with little reported on soil remediation.This article analyzes the spatial distribution and enrichment characteristics of synthetic musk in a contaminated site in China,finding that SMs have stronger migration ability in the horizontal direction,with a vertical increase before decreasing and enrichment in the silt clay layer.Three representative remediation technologies,including chemical oxidation,ex-situ thermal desorption,and cement kiln co-processing,were selected to explore the key process parameters for SMs-contaminated soil remediation technology through experiments.The results show that some SMs can be chemically oxidized,but the oxidation concentration is still higher than the “risk control value” determined by the detection limit of 0.1mg/kg;the efficiency of SMs thermal desorption increases significantly with increasing heating temperature and then tends to be stable,and continuous temperature increase is not economical for improving the remediation effect;cement kiln co-disposal technology is an effective way to ensure that SMs contaminated soil is remediated to meet standards and achieve resource utilization.Finally,this article proposes a prospect for detection methods,risk assessment methods,and governance models for synthetic musk pollutants,in combination with the current situation where there are no laws,regulations,or standards for synthetic musk pollutants.

       

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