Abstract: Electrobioremediation is an innovative method to remedy organiccontaminated soil. This paper studied the effect of voltage on pyrene degradation and microbial community in soil during remediation process. The results showed that pyrene degradation and microbial community composition were different at the anode and cathode regions with the change of voltage. There was a positive correlation between voltage and pyrene degradation (r=0.55, P<0.01) at the anode region, and the highest percentage of pyrene degradation reached 87.5% under the treatment of 2.0 V·cm^-1 at anode region. Meanwhile, with the increase of voltage, the pyrene degradation rate increased at first and then decreased at the cathode region, and the highest percentage of pyrene degradation reached 87.8% under the treatment of 1.2 V·cm^-1 at the cathode region. A negative relationship existed between microbial activity and diversity and voltage at the anode region, while the microbial activity and diversity showed the same trend as the pyrene degradation at the cathode region. According to the results of pyrene degradation and microbial community, 1.2 V·cm^-1 was the most suitable voltage, which ensured the electric oxidation and maximized the role of microbial degradation. Our study provided the theoretical foundation and technical method for the control of electrobioremediation process.

Key words: China nationally important agricultural heritage system, ecosystem services, ecological compensation, Chongyi Hakka Terrace system, economic evaluation