I am having quite allot of trouble with peroxide compatibly. I used only materials that were compatable (PVC, SS and PE), cleaned meticulously, rinsed with distilled water, then acid and still I get a stream of bubbles. At the moment the sparging column is a PVC pipe, but I am thinking I will switch to all Stainless. At the moment I am pumping warm water from a hot water urn through the column to heat the peroxide, but it occurred to me that I could just use the urn (which is all stainless) and save myself quite a bit of trouble. I will have to replace the seals with viton for compatibility and replace the tap but that should be it. The one downside is that it has a short aspect ratio which wont give much time for the air to be in contact with the solution but the vapour coming off seems saturated as it is so I dont think this will result in a loss of efficiently.
Here are a few pictures of the final PVC concentrator. The three barbs which can be seen are for heating water in, out and air in. I used sprinkler fittings to spray air, which allows for easy adjustment.