基于植物仿生的土壤重金属污染原位自持修复技术

Soil heavy metal pollution in situ remediation technique-based on plant evapotranspiration bionic development

采用基于植物仿生的重金属污染土壤原位自持修复技术,研究该方法对重金属污染土壤的修复能力,同时研究活性炭比例、填料装填方式、装置高度和"叶片"材质等4种因素对植物仿生装置修复效率的影响.结果表明,通过植物仿生修复重金属污染土壤中Cr、Ni、Zn和Fe的降低率分别为12.8%、4.1%、27.6%和16.8%,证明了植物仿生修复技术的可行性.活性炭比例、填料装填方式、装置高度和"叶片"材质等4种因素都对植物仿生装置的修复效率存在一定的影响.其中,管件的高度与修复装置蒸发速率呈负相关性,修复装置越高蒸发速率越慢;增加活性炭的量对装置蒸发速率的影响不明显,模拟"叶片"的材料对蒸发速率大小的影响顺序为:玻璃纤维丝>玻璃纤维布>棉纱,蒸发速率分别为:100.1 g·d^(-1)、64.8 g·d^(-1)和61.6 g·d^(-1).

Remediation of heavy metal contaminated soils was studied in this article,using the in situ remediation technique based on phyto-mimic method. Results showed that the reduction rate for heavy metals of Cr,Ni,Zn and Fe were 12. 8%,4. 1%,27. 6% and 16. 8%,respectively. Four factors including the proportion of activated carbon,the loading mode of filler,the height of the device and the nature of ＂blade＂material were studied regarding the remediation efficiency. The height and the rate of evaporation showed a negative correlation with the remediation device,higher device decreased the evaporation rate. The effect of activated carbon amount on evaporation rate of the device is not obvious. The order of evaporation rate with different ＂blade＂simulating materials was Glass fiber yarn 〉glass fiber cloth〉 cotton yarn,and the evaporation rates were 100. 1 g·d^-1,64.8 g·d^-1and 61.6 g·d^-1,respectively.