I tried to do the recommended search on the "Acid Peroxide rejuvenate" and ended up with 114 posts, looked at them and could not get closer to an answer.
Searches used: "AP Reuse" , "AP AND Reuse" , "Acid AND Peroxide AND Reuse", exchanged reuse with recycled, still no joy...
I then read your essay on your site and got everything I needed and more.
Now, that being said, I remember on one of my read every post till I fall asleep forum visits, that a process existed that;
If you ran a current through a steel anode/cathode that copper would cement out, leaving your solution light green and ready to use again.
Am I confusing this process of reuse; with that of just reclaiming copper metal from CuCl solution and destroying my AP solution for further use.
The thread I remember had pictures of two steel anode/cathodes hooked up to a battery charger in a large glass tank filled with used AP.
I have 5 gallons of used AP that I would like to drop the copper out of, but since I read your essay now I think the copper is useful as long as I bubble air and perhaps add H2O2 and even heat the solution to evaporate H2O and re-considerate my Acid Molarity.