金属表面硫酸盐还原菌微生物膜内的反应影响金属腐蚀的机理和速度,杀灭膜内微生物是控制微生物膜腐蚀金属的重要措施.采用丝束电极技术,研究了油田污水中生物膜在Q345碳钢表面的生长规律;通过投加3种杀菌剂来灭杀生物膜内细菌,并对其杀菌效果进行了比较,获得了杀菌剂对细菌的抑制周期及最低有效浓度.结果表明:油田污水中微生物首先在Q345碳钢表面大量附着、生长,至216 h时生长完整,至360 h时开始脱落;生物膜对Q345钢的腐蚀呈现不均匀性,微生物的存在可在局部范围内降低Q345碳钢表面的腐蚀电流密度,但有促进其腐蚀的倾向;杀菌剂H GY-B1的杀菌效果优于KD-24及LC-3,投添加量为300 mg/L时,对生物膜内细菌抑制周期可达8d,最低杀菌浓度为40 mg/L.
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