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EFFECT OF HYDROGEN PEROXIDE IN PHOTOCATALYTIC TREATMENT AND ANAEROBIC DIGESTION OF POST-HYDROTHERMAL WASTEWATER

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Hydrothermal liquefaction can convert various types of biomass into bio-crude oil. However, post-hydrotermal wastewater (PHWW) may contain toxic compounds to several organisms. The aim of this study was to evaluate the use of H2O2 combined with photocatalysis and with anaerobic digestion for the treatment of PHWW. PHWW was generated through a S. plantesis conversion (300 °C, 30 min, 20 % of total solids). Photocatalytic experiments were carried out in the presence of TiO2 (anatase) with H2O2/chemical oxygen demand (COD) ratio value (RHC) ranging from 0 to 0.5 gH2O2/gCOD. The biomethane potential assays were performed as the only treatment and after H2O2 oxidation. As anaerobic digestion pre-treatment, the oxidation was performed with RHC value ranging from 0.25 to 0.75 gH2O2/gCOD. The efficiency of the photocatalysis combined with H2O2 was greater than that obtained when the process was applied isolated. The anaerobic digestion of pre-treated PHWW showed a greater CH4 production and higher organic matter removal, compared to anaerobic digestion of raw PHWW.