Kinetic analysis for ammonia decomposition in supercritical water oxidation of sewage sludge

Supercritical water oxidation was applied to the destruction of municipal e xcess sewage sludge. The reaction was carried out in a batch reactor with h ydrogen peroxide as an oxidant in the temperature range of 723-823 K. Ammon ia and acetic acid are found to be refractory intermediates in supercritica l water oxidation of organic wastes. Ammonia concentration produced during the reaction was measured as a function of reaction time. The dynamic data were analyzed by a first-order kinetics. The reaction rate constant coincid es with those reported in the literature.