Abstract--A system has bccn developed in which a small anode and large cathode can bc induced in a concentric stainless stcel electrode. A current of approximately 11 uA cm -z was applied for 72 h while bacteria were allowed to colonize the electrode in a closed system, in artificial seawater under anaerobic conditions. Once the applied current was removed, the resultant galvanic current was monitored and a flow of nutrients resumed to an open system. Only a co-culture of S RB and Vibrio sp. maintained a current of approximately 3 ~A cm 2 for >2110 h. No current was maintained with purc axenic cultures or in sterile controls. Bacterial counts revealed that the resultant current was dependent on the number and type of bacteria on both the anode and cathode. It would appear that SRB are necessary on the cathode, leading to high charge transfer resistance above 100 kl~ cm ~ , while a mixed consortium is necessary on the anodc giving low charge transfer resistance below 1 k[~ cm:. These results would appear to give further cvidence for the previously proposed cathodic depolarization theory as a mechanism for MIC and for another anodic reaction involving a mixed consortium.
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