微生物燃料电池修复石油污染盐碱土壤

Microbial fuel cell remediation for saline-alkaline soil contaminated by petroleum hydrocarbons

生物电化学技术修复石油污染土壤并同步产出电能是一种新兴的污染土壤生态修复技术。对石油污染土壤通过其微生物燃料电池的构造,利用电化学阻抗谱分析了土壤的欧姆内阻,拟合估算了土壤的电导率,并考察了土壤微生物燃料电池的产电性能和修复效果。结果表明:采用丙酮清洗过的阳极并有水封的情况下,土壤微生物燃料电池的欧姆内阻下降了52%,电导率升高了1倍;在启动后的120 h内,最大电压和累计产出电量分别达189 m V和36 C,与对照相比分别增加了20和29倍。输出电压随着阴极与阳极之间距离的增大而减小。经过30 d的生物电化学处理,土壤中的总石油烃去除率是开路对照的3.3倍。该研究是石油污染盐碱土壤生物电化学修复的初步探索,以为污染土壤的生态修复提供新的思路。

Bioelectrochemical stimulation as a means of remedying petroleum hydrocarbon contaminated soil is an emerging ecological remediation technique. A soil microbial fuel cell（ MFC） was constructed to analyze the ohmic resistance and evaluate the soil electrical conductivity and electricity generation as well as the total petroleum hydrocarbon degradation rate. The results showed that the ohmic resistance of the soil MFC with acetonecleaned anodes and a water seal layer was decreased by 52%,increasing the soil conductivity by 100%. The maximum voltage and accumulated charge output of the soil MFC over 120 h reached 189 m V and 36 C,respectively,exceeding the corresponding values of the control cell by factors of 20 and 29. Furthermore,the voltages decreased with increasing distance between the cathode and the anode. After 30 d,the total petroleum hydrocarbon degradation rate was 3. 3 times higher than that of the control. This study preliminarily explored the application of bioelectrochemical remediation,which is found to be a promising approach for soil remediation.