Peroxide Disinfection

[birkATO]

Does H2O2 really work very well as a disinfectant in DI water systems without a UV light source or some catalyst. I have read that it isn't a good disinfectant. We currently put about 0.05% H2O2 in our DI water system to keep it free of bacteria.

 

[moltenmetal]

Nope. H2O2 at concentrations this low is just an oxygen source. People actually add H2O2 to groundwater to promote aerobic bacterial growth. At 0.05% it's not toxic to much. If you add UV to the system, you'll make some *OH radicals which do have some disinfective effect, but the UV will do the job of disinfection without the H2O2 just fine.

 

[azertyuiop]

Peroxide is a very good desinfectant , but not for your type of application.

I have had an cupforming equipment supplier who used a high concentration peroxide bath to decontaminate the plastic foil that was used for the cupforming , prior being filled with a milk product and sealed.