SYNERGISTIC EFFECT OF ELECTRIC FIELD AND BACTERICIDE AGAINST SULFATE-REDUCING BACTERIA BIOFILMS
电场和杀菌剂对杀灭生物膜下硫酸盐还原菌的协同作用

This work concerns that the effect of square wave current and also the synergistic effect of bactericide and current on the formation and the growth of sulfate-reducing bacteria (SRB) biofilms respectively.The tests indicate there were no significant differences in the course of forming biofilms,but in the same case,the number of SRB per square centimeter was significantly lower with electrical current than without current.When applied within the same electric field with the same current density,two bactericides exhibited enhanced killing action against SRB biofilms growth on mild steel coupons.The same bactericide concentrations used with electrical current resulted in numbers of SRB cells per square centimeter were significantly lower than those due to bactericide treatment alone without curred.And this paper discussed the mechanism of the synergistic effect of bactericide and electrical current in SRB biofilms in terms of mass transfer of bactericide and desorption of calcium ion and magnesium ion from SRB biofilms.