Patent ID: 7189329

Claim:
A method for improving the efficacy of a peroxide deinking or bleaching agent in industrial process waters, the method comprising: introducing a peroxide deinking or bleaching agent into an industrial water environment; and introducing a substance formed by the reaction of a hypochiorite oxidant and an ammonium salt and capable of interfering with the production of a peroxide-degrading enzyme by a collection of microorganisms attached to a surface in said industrial water environment to contact said collection of microorganisms when attached to said surface in said industrial water environment by introducing said substance into water in said industrial water environment at a first concentration and for a first duration, and thereafter, after a second duration during which said substance is not introduced into said water, again causing said substance to contact said collection of microorganisms by again introducing said substance into said water in said industrial water environment, wherein said first duration and said first concentration are selected to be sufficient to substantially eliminate the production of said enzyme by said collection of microorganisms in said industrial water environment during said second duration, but insufficient to completely eradicate said collection of microorganisms and insufficient to inactivate said enzyme, whereby said efficacy.