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Biodegradation of phenol by pleurotus laccase in the directcurrent electric field

Dajun Ren, Xiaoyong He, Chunxing Wang, Shuqing Zhang

In this article, the effect of direct current electric field on the phenol biodegradation by laccase was studied. The results showed that the DC electric field could enhance the biodegradation activity of laccase. Specifically, the rate of phenol biodegradation when catalyzed by laccase was significantly higher in the presence of the DC electric field than in its absence. In the presence of the DC electric field, the biodegradation rate of phenol which catalyzed by laccase was 98.6%, and the phenol concentration in the residual solution was below 0.7 mg/L after 96 h. In the absence of the electric field and with laccase, the biodegradation rate of phenol laccase was 81.7%, and the phenol concentration in the residual solution was 9-10 mg/L after 96 h. Therefore, the combination of DC electric field and laccase is likely to create a stable, simple and environmentally friendly biodegradation system.