Hydrogen peroxide (H2O2) as a source of dissolved oxygen in COD-degradation respirometric experiments

Two different re-oxygenation techniques (aeration and hydrogen peroxide addition) were compared in respirometric experiments. As similar results were obtained in both cases, it was concluded that the addition of hydrogen peroxide does not modify the oxygen uptake rate of the biomass, under either endogenous or feeding conditions. It was hypothesized that under those experimental conditions (inhibition of nitrification with ATU), hydrogen peroxide alters neither the biomass metabolism nor the biodegradability of the tested substrates. The oxygen uptake rates obtained with the aeration system were often more scattered due to the adhesion of fine bubbles after the switch off of the aeration. Moreover, the transfer rate of oxygen to the solution is faster in the case of hydrogen peroxide addition.