复杂有机物污染地块原位热脱附修复技术的研究

Remediation of Complex Organic Compounds in Contaminated Plot with In-Situ Thermal Desorption

鉴于复杂有机物污染地块治理难度大,国内用地形势紧张,因此关于原位热脱附技术在复杂有机物污染地块中的运用越来越受到学术界的广泛关注。综述了三类主要的原位热脱附技术:电阻热脱附、热传导热脱附和蒸汽热脱附,根据污染场地状况总结了各类原位热脱附技术的影响因素和适用范围,并给出了相应的技术路线。阐明了温度、时间、土壤含水率、土壤渗透性等因素对热脱附效果的影响。研究表明温度越高、时间越长、土壤含水率适中、渗透性较好的土壤,有机污染物热脱附性能更好。对于有机物重度污染的难处理地块,相比其他原位修复技术,原位热脱附技术具有更好的运用前景。

In view of the hard treatment of plots contaminated by complex organic matter, the application of in-situ thermal desorption technique in complex organic contaminated plots has attracted the great attention of academic community. This paper reviewed three main types of in-situ thermal desorption： Electrical Resistance Heating,Thermal Conductive Heating and Steam Enhanced Extraction. According to the situation of contaminated site, the influence factors and the application scope of all kinds of thermal desorption technique were summarized, and the technical route was shown. The influences of temperature, time, soil moisture, soil permeability and other factors on thermal desorption effect were clarified. The results showed that the higher temperature, the longer time, the more suitable soil moisture content and the better permeability, the thermal desorption performance of organic pollutants was better. Compared to the other in-situ remediation techniques, in-situ thermal desorption technique has a good application prospect for the refractory organics-contaminated site.