This work investigated supercritical water oxidation (SCWO) of DBU (C9H16N2)(1) in the absence and presence of isopropyl alcohol (IPA) as co-fuel. SCWO was studied in a plug-flow reactor under different temperatures (400-525 degrees C), initial DBU concentrations (1-10 mM at reactor conditions), oxidant ratios (0.8-2), and [PA](0)/[DBU](0) ratios (0.5-4). Pseudo First Order and the Global Power Law models expressed the kinetics, and the rate constants were evaluated. Furthermore, SCWO of aqueous ammonia (NH4+) as feedstock was studied at several temperatures (400-500 degrees C), oxidant ratios (0.8-2.0) and [IPA](0)/[NH4+](0) ratios; and the same kinetic models were applied. Results showed that IPA addition increased the reaction rate constant k, affected oxidant utilisation, and greatly enhanced NH4+ removal% towards gaseous nitrogen. The influence of IPA addition was more pronounced on N-speciation than it was on TOC% removal, for all current system conditions.