Effect of microbial growth products on biocide activity in metalworking fluids

Abstract

The effect of bacterial growth products on seven industrial biocides used in metalworking fluids was evaluated. Prior bacterial growth in two typical metalworking fluids resulted in a substrate that uniformly reduced the effectiveness of all biocides when compared to the same unused metalworking fluids. Two selective results of growth in metalworking fluid, lowering of pH and production of sulfide, only affected two of the biocides.