An Evaluation in Large-Scale Test Systems of Biocides for Control of Sulfate-Reducing Bacteria in Shipboard Fuel Tanks.

摘要

Microbial contamination of shipboard,water-compensated,hydrocarbon fuel tanks has repeatedly caused operational difficulties for the Navy. Marine sulfate-reducing bacteria produce corrosive conditions which are particularly troublesome. These microorganisms can be controlled by adding a biocide to the water. Three biocides found promising in earlier test-tube screening assays at NRL have been reevaluated in 20-liter metal drums simulating ship's tanks. Conditions for growth of sulfate-reducing bacteria were more favorable and the concentration of biocide required for control higher than they were in the earlier test-tube scale systems. Ten-fold or greater concentrations of biocides were required for microbial control when biocide addition was made after,rather than before,bacterial growth had developed extensively. Taking into account the information available on the probable toxicity for marine life which the biocides would have when they are discharged into the ocean, a triazine compound appeared a somewhat more favorable choice for trial in a ship tank than either of the other biocides - a thiopyridine derivative and methylene bisthiocyanate. (Author)