In this work, calcium peroxide has been used as a source of hydrogen peroxide for the development of the calcium peroxide advanced oxidation process. Calcium peroxide has been used to degrade a variety of contaminants in both aqueous and soil systems at neutral pH using chelated Fe(II) as catalyst. Benzoic acid (BA) was successfully degraded at neutral pH in aqueous system using citric acid (CiAc) and oxalic acid (OA) as chelating agents. The optimal ratio between oxidant and catalyst was found to be 1/1. 98\% of the initial BA present in a soil slurry was degraded by using a 1/1 ratio between oxidant and catalyst and a 100/1 ratio between oxidant and contaminant. Heavily tetrachloroethene (PCE) contaminated soil has been successfully treated reaching up to 77\% PCE removal by using calcium peroxide activated by Fe(II) chelated with OA. Column studies showed that calcium peroxide is able to release hydrogen peroxide effectively over a minimum of 8 hours. The operating flowrate did not have any influence on the hydrogen peroxide concentration measured at the outlet of the column. A decrease in temperature increases the total amount of hydrogen peroxide released.