电场和杀菌剂对杀灭生物膜下硫酸盐还原菌的协同作用

研究了交变电场对生物膜的形成和对已经形成生物膜 的影响以及电场和杀菌剂的共同作用等方面问题.研究表明，电场对生物膜的形成没有影响 ，而在相同的情况下对已经形成的生物膜单位面积上的细菌量却有所降低; 在同样的时间内 采用同样的外加电场时，两种杀菌剂杀灭生物膜中的硫酸盐还原菌(SRB)所需要的杀菌剂的 浓度远远低于没有外加电场的情况.并从杀菌剂的传质过程和Ca、Mg离子从生物膜中脱除两 方面对电场和杀菌剂的协同作用机理进行探讨.

SYNERGISTIC EFFECT OF ELECTRIC FIELD AND BACTERICIDE AGAINST SULFATE-REDUCING BACTERIA BIOFILMS

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.