Monitoring of biofilm in cooling wate tio

Ka agats cemb Biofilm fo ase o exchange ca m is biocide add s diffi for monitori roor Microorgani There the system. and was conduc, lact formed on carbon steel coupon. The lactic acid consumption rate (Rlac) was estimated at 273 mg/(m h). The Rlac value was compared before and after the hydrogen peroxide wash of the bench-scale plant. The Rlac before the wash was 36.3 mg/(m2 h). On the other hand, the Rlac after the wash was negligible. An experimental study was next conducted in the operating cooling water plant. A rapid decrease of lactic acid concentration in the circulating water of a relatively unclean system was shown. On the other hand, Rlac in a clean system was low. This simple method provided us information on biologically active biofilm formation in the system