Biocides are often dosed into cooling systems to reach specified concentrations, but are not linked in real-time to the total microbial contamination/activity present. This paper describes a method to determine total biological activity on-line, in real-time with fluorescent bio-reporters and how to use this information to control microbial activity with oxidizing/non-oxidizing biocides.
Keywords: bioreporter, biocides, fluorescence, control, water treatment