(376g) Treatment of Phenol Wastewater by Electro-Microbe Coupling Technics

Electro biotechnology as an environment-friendly technology shows potential values in the field of environment pollution treatment. It is necessary to carry out extensive research theoretically and practically.

Phenol is used in the preparation of antiseptics, dyes, antirust products, synthetic resin, photographic, chemicals inks, etc. Their derivatives are present in wastewater of many industries such as oil refineries, chemical plants and coke ovens. Because it is toxic to many biochemical functions and poses risks to populations, phenol degradation by microorganism has been studied extensively.

We study the influences factors such as initial concentration, voltage, pH vaule and proportion between liquid and solid toward phenol degradation process in coupling technics include electro-catalytic method and immobilized microorganisms method when we treat high concentration phenol wastewater. Under the optimal reaction condition 5.5 V, pH=7, 6 liter phenol solution of initial concentration 500, 1000 & 1500mg. L^-1 were totally degradation in 14, 20 & 31 hours by coupling technics while they were totally degradation in 16, 22 & 37 hours by immobilized microorganisms method. Electro-catalytic method is inefficient, for example, 6 liter 500mg. L^-1 phenol solution was totally degradation in 39 hours.

As a result, we find zero grade kinetics rule are the same with degradation process of the three reaction methods. The degradation efficiency of coupling technics is almost the summation of the two single methods in unit reaction time. It means that the restraining action between electro-catalytic and immobilized microorganisms method could be ignored. So could we know the coupling technics is a kind of high efficiency method.

Acknowledgments

The research was supported and by Nature Science Fund of Tianjin, China(07JCZDJC01400)and Nature Science Fund of  China(50808130)