At treatment of contaminants of concern (COC) by Perozone®, the effect of the treatment is monitored by a decrease of concentrations of COC and a increase of oxidizing conditions (raising of DO and ORP). Also standard parameters like pH and EC are monitored. At some sites side-effects appear through changing of pH and/or EC, indicating the formation of byproducts through oxidation of “co-contaminants”. At that stage a monitoring program is broadened to trigger the oxidation of probably native species. Nowadays the standard monitoring program at treatments by Perozone® contains also the macroparameters like COD, alkalinity, sulphate and nitrate. The formation of sulphate and/or nitrate as competitors for reductive dechlorination and probably causing a acidifying of the aquifer is important to monitor in an ISCO-BIO approach.
This presentation shows some field case studies and full-scale applications with the geochemical effects of ISCO by Perozone®. Also preliminary results of a full scale chemical oxidation combined with the start-up of a biological reductive treatment will be presented.