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Effects of Operational Conditions on Sludge Degradation and Organic Acids Formation in Low-critical Wet Air Oxidation by Jinwook Chung; Mikyung Lee; Jaehwan Ahn; Wookeun Bae; Yong-Woo Lee; Hojae Shim is a Environmental Science article available to read on EtoBox.

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Wet air oxidation processes are to treat highly concentrated organic compounds including refractory materials, sludge, and night soil, and usually operated at supercritical water conditions of high temperature and pressure. In this study, the effects of operational conditions including temperature, pressure, and oxidant dose on sludge degradation and conversion into subsequent intermediates such as organic acids were investigated at low critical wet oxidation conditions. The reaction time and temperature in the wet air oxidation process was shown an important factor affecting the liquefaction of volatile solids, with more significant effect on the thermal hydrolysis reaction rather than the oxidation reaction. The degradation efficiency of sludge and the formation of organic acids were improved with longer reaction time and higher reaction temperature. For the sludge reduction and the organic acids formation under the wet air oxidation, the optimal conditions for reaction temperature, time, pressure, and oxidant dose were shown approximately 240 degrees C, 30min, 60atm, and 2.0L/min, respectively.

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Author

Jinwook Chung; Mikyung Lee; Jaehwan Ahn; Wookeun Bae; Yong-Woo Lee; Hojae Shim

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)