土壤复合污染的联合修复技术研究进展

New approaches for remediation of soils with multiple pollutants

复合污染是土壤污染的主要存在形式,其中重金属、有机污染物等是主要的污染源。例如,共存于土壤中铅和镉会发生交互作用,从而增强了镉的迁移能力。此前单一的物理、化学、生物等修复手段对复合污染的修复效果并不明显。联合修复技术的使用可以在一定程度上克服使用单一的修复手段存在的缺点,提高修复效率、降低修复成本。最近有研究表明,综合利用化学氧化和超声波方法可以在很短的时间内将土壤中的甲苯和二甲苯完全氧化为CO和CO2。介绍了综合利用物理、化学、生物等方法对土壤复合污染修复的进展,并对研究中需要注意的问题及未来的发展趋势说明。

Combined pollution is the main form of soil contamination, i.e. including heavy metals and organic pollutants, constitute the main form of soil contamination. For example, the coexistence of lead and cadmium in soils can interact with each other and consequently increases cadmium mobility. The application of simple physical, chemical and biological remediation methods in combined pollution sites is not satisfactory to mitigate the pollution. Therefore, a combination of different techniques is required to remediate these sites with multiple pollutants to enhance the remediation efficiency and at reasonable cost. Recent example indicates that the combination of chemical oxidation and ultrasonic techniques can transform toluene and xylene in soil into CO and CO2 in very short time. Progress to-date on the effective combination of different techniques to mitigate the soils with multiple pollutants has been discussed in the paper.