电动力修复四环素类抗生素污染土壤的效果研究

Effect of Electrodynamic Remediation on Tetracycline-contaminated Soil

电动力修复技术能有效地去除土壤中四环素类抗生素(tetracyclines, TCs)、抗生素耐药菌(antibiotic resistant bacteria,ARB)、抗生素抗性基因(antibiotic resistance genes, ARGs)等污染物。为了探究不同时间处理对土壤中污染物的去除效果,分别考察了电动力修复3、7、10 d土壤中TCs、ARB、ARGs的去除效果以及电能消耗情况。结果表明:随着反应的进行,土壤中TCs降解率由13.5%~19.8%(3 d)上升为29.8%~48.2%(10 d)。反应7 d时电场对TCs降解的贡献率为44.3%~59.8%,高于反应10 d处理(36.4%~56.3%)。反应7 d时土壤中ARB、ARGs去除率为17.6%~35.1%、38.1%~60.5%,高于反应3 d(13.4%~25.9%、26.3%~57.3%)、10 d(13.8%~29.7%、35.0%~52.2%)处理,同时能耗较少(47.37 kWh/m3)。反应3 d时土壤中TCs降解率较低,而反应7 d以后土壤电导率下降,导致电化学效率降低,同时能耗增大。综合TCs、ARB、ARGs去除效果以及电能消耗,电动力修复7 d时效果最佳。综上,电动力修复技术是治理土壤抗生素和耐药菌污染的有效手段。

Electrodynamic technology can effectively remove pollutants such as tetracyclines(TCs), antibiotic resistant bacteria(ARB), and antibiotic resistance genes(ARGs) in the soil. In order to understand the effect of different time treatments on the removal of pollutants in soil, the removal effects of TCs, ARB, ARGs and electrical energy consumption in 3, 7, 10 days in soil by electrodynamic technology were studied. The results showed that with the progress of the reaction, the degradation rate of TCs in the soil increased from 13.5%~19.8%(3 d) to 29.8%~48.2%(10 d). The electric field contribution rate in 7 days was44.3%~59.8%, higher than the treatment in 10 days(36.4%~56.3%). The removal rates of ARB and ARGs in the soil were17.6%~35.1%, 38.1%~60.5% in 7 days, which was higher than the reaction in 3 days(13.4%~25.9%, 26.3%~57.3%), 10 days(13.8%~29.7%, 35.0%~52.2%), while the power consumption was less(47.37 kWh/m^3). The degradation rate of TCs in the soil was lower at 3 days after electrodynamic restoration, but the soil conductivity decreased after 7 days, resulting in a decrease in electrochemical efficiency and an increase in energy consumption. Based on the removal effect of TCs, ARB and ARGs and the consumption of electric energy all combined, the results showed that the repair effect was best when the electric power was processed for 7 days. To sum up, electrodynamic technology can provide a new effective and feasible way for the remediation of antibiotics and drug-resistant bacteria.