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The effect of a thermo-oxidative co-treatment placed in between the two reactors of two-stage anaerobic digestion of excess municipal sludge was studied. The oxidant used was hydrogen peroxide and moderate temperatures below boiling point of water were considered. The first experiment was to elucidate the effect of two different temperatures, 65 and 90°C of oxidation using a constant oxidant dose of 1.0 g H2O2/g VSSinfluent. Use of thermo-oxidative co-treatment increased overall solids destruction by 24.9 and 33.5%, respectively when operating at 65 and 90°C respectively. Because of this significant impact of temperature on the performance of the process, a second experiment was conducted using the higher temperature of 90°C while decreasing the hydrogen peroxide dosage to 0.5, 0.25 and 0.1 g H2O2/g VSSinfluent. An increase in solids destruction of 13.9, 18.9 and 25.6% was observed when the thermo-oxidative co-treatment was employed using oxidant dosages of 0.1, 0.25 and 0.5 g H2O2/g VSSinfluent, respectively.

Document Type: Research Article


Publication date: January 1, 2005

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