土壤电动修复中电极切换对土壤微生物群落的影响

通过细菌计数和Biolog方法,研究了在3.0 V·cm-1的电压梯度下,不同电场切换周期(24 h、5 h、10min和1 min)对土壤微生物群落的影响.结果表明,电压梯度为3.0 V·cm-1的电场作用能够促进土壤微生物的活性,但会轻微地降低土壤微生物功能多样性,电场切换不能改变这种电场对微生物群落的影响;长时间的电场处理下,电极反应对微生物数量和功能多样性损害严重,切换电场电极能有效消除电极效应,电场电极切换周期≤5 h时,可保护电极附近土壤微生物多样性,当切换周期≤10min时,不仅可保护土壤微生物多样性,而且可以保护微生物数量.研究结果说明了电场电极切换能有效降低电极反应对微生物群落的影响,揭示了电场电极切换对土壤微生物群落影响的规律,为电场电极切换方法在污染土壤电动强化生物修复技术中的深化和应用提供理论依据.

Effect of Polarity Reversal of Electric Field on Soil Microbial Community

Electrokinetic bioremediation is an important technique for contaminated soil remediation. However, the extreme environment induced by electrochemical reactions can adversely affect soil microbial activities, especially when the soil microbial community is exposed to a long-lasting electric field application. Electric field polarity reversal may be an effective way to minimize such effects. In this study, we examined the effects of different polarity reversal intervals(24 h, 5 h, 10 min and 1 min)in an elec...