污染场地修复中原位热脱附技术与其他相关技术耦合联用的意义、效果及展望

Significance, effects and prospect of in-situ thermal desorption coupled with other related technologies in the contaminated site remediation

在有机污染场地修复过程中,原位热脱附技术因具有土方不开挖、不转运、对周围环境干扰小以及污染物去除彻底等诸多优势,故其应用范围逐渐增多。但该技术也存在修复施工成本相对较高的弊端,且此弊端主要是由于采用单一热脱附技术能耗很高的原因造成的。原位热脱附技术与化学氧化、微生物降解以及蒸汽注射等手段的耦合可以很好地弥补这一不足,尤其是针对大型的复杂有机污染场地。针对目前原位热脱附技术在应用过程中存在的主要问题,在分析了国内外大量相关研究与案例的基础上,梳理了原位热脱附与化学氧化、微生物降解及其他原位热处理等技术耦合的应用情况,提出了原位热脱附耦合技术的工程应用建议。

The technology of in-situ thermal desorption(ISTD)has been gradually applied on the remediation of contaminated sites due to its special advantages of no-excavation,no-transportation,less environmental disturbance and complete organic pollutants removal.However,it has an obvious disadvantage of the relatively high cost of remediation and construction due to high energy consumption of the single thermal desorption technology.ISTD coupled with other remediation technologies like chemical oxidation,microbial degradation and steam injection could make up for this disadvantage,especially for the large and complex contaminated site.Aiming at the main problems in the application of ISTD technology,the application status of ISTD coupled with chemical oxidation,biodegradation and other thermal technologies was introduced in this review.At the same time,the engineering application and research direction of ISTD coupled with other technologies are proposed.