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

Abstract:

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 min), oxidant dose (100%-200%), were evaluated. Orthogonal Array design was applied in order to consider each parameters impact on COD removal. Study results indicate that 97.89% of COD in the sludge sample can be removed in 10min at 500°C, 30MPa and 200% H₂O₂ oxidant excess dose. Temperature, pressure, resident time are main factors to affect the reaction, while oxidant dose has a little effect on removal of COD in municipal wastewater sludge. The conclusion is the organic matter in municipal wastewater sludge can be removed effectively by super critical water oxidation.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 1732-1738
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.1732
• Online since: August 2013
• Authors: Dan Li, Cong Jun Sun, Jian Feng Ye
• Keywords: Municipal Wastewater, Sludge, Supercritical Water Oxidation

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DOI: 10.1021/ie00013a032