The other method tested using ion-exchanged zeolites together with hydrogen peroxide, was a very attractive process. Thus, toxic metals like copper or cobalt released during dye degradation can be easily recovered using this process. Similarly, the toxic metals ion-exchanged onto zeolites can be easily leached out using dilute acids. This allows the effective regeneration of the columns. The hydrogen peroxide decays to oxygen and water, so the entire system is environmentally friendly.
Zeolites are non-toxic aluminosilicates and pose no disposal problems.
The feasibility of this process has been amply demonstrated to recommend further studies under a possible follow-on Phase II project.