Removal Efficiency of Organic Substance in Municipal Sludge by Supercritical Water Oxidation

摘要

In this study efficiency of organic matter in municipal wastewater sludge treated by supercritical water is investigated. Influences of main reaction parameters, including temperature (380~500°C), pressure (23-30 MPa), residence time (1-10 mins), oxidant dose (100%-200%), were evaluated. Univariate Analysis was applied in order to consider each parameter's impact on CODcr removal. Study results indicate that 97.89% of CODcr in the sludge sample can be removed in 10min at 500°C, 30MPa and 200% H_2O_2 oxidant excess dose. Temperature, pressure, resident time are main factors to affect the reaction, while oxidant dose has a little effect on removal of CODcr in municipal wastewater sludge. After SCWO process, the organic matter in municipal wastewater sludge can be removed effectively by super critical water oxidation.