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Catalytic Wet Peroxide Oxidation (CWPO) for the continuous treatment of a phenolic aqueous solution has been studied on a pilot scale process. The pilot plant has been designed by integration of a catalytic fixed bed reactor (FBR) with a continuous stirred tank reactor (CSTR). The CSTR is used as reservoir for the continuous delivering of a recirculation stream through the catalytic bed. The main part of phenol mineralization takes place by catalytic oxidation in the FBR. The mesoporous SBA-15 silica-supported iron oxide (Fe 2 O 3 /SBA- 15) agglomerated with bentonite has been selected as catalyst, according to preliminary studies for the continuous treatment of phenolic aqueous solutions in a catalytic packed-bed reactor operating in upflow (1). The efficiency of the wet peroxide oxidation treatment under different operation conditions has been evaluated in terms of phenol degradation, total organic carbon (TOC) reduction and hydrogen peroxide conversion. Among the main operation conditions, the feed and recirculation liquid flow rates, the catalyst loading and the temperature in the CSTR were studied. The increase of the residence time as the feed flow rate is reduced has shown a remarkable improvement of the process efficiency, whereas the variation of the recirculation flow through the FBR has slightly affected the overall catalytic performance. A significant enhancement of the process efficiency has been also found as the temperature of the CSTR was increased up to 80 °C. Under the most favourable operating conditions, phenol was almost totally degraded (99%) and TOC was reduced up to ca. 63% at steady-state conditions. In concern to the catalyst stability, a low dissolution of iron within the aqueous solution during the process has been proven.

Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale