Verhoeve Milieu & Water

Geochemical Effects of Perozone®: Important for Bio?

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Perozone® (peroxide-coated ozone) is used as a stand alone ISCO remediation technique at several sites where chlorinated solvents and their breakdown products are present. In both source and plume area low ppb levels appeared to be achievable. However, in some cases a combined ISCO-BIO approach may lead to lower cost. ISCO is then used for source removal and BIO is used for polishing before site closure. For the biological treatment of chlorinated solvents this implies the application of reductive conditions, following oxidation.

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.

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