Treatment of industrial oily wastewaters by wet oxidation.
In the present work, the homogeneous wet oxidation (WO) of an oily wastewater (COD approximately 11,000 mg l(-1)), composed mainly of alcohols and phenolic compounds, was studied in a high-pressure agitated autoclave reactor in the temperature range of 180-260 degrees C and oxygen pressure 1 MPa. Temperature was found to have a significant impact on the oxidation of the contaminants in the wastewater. Among the compounds contained in the wastewater, ethylene glycol showed great resistance to wet oxidation. Temperatures above 240 degrees C were required for its effective degradation. Organic acids, mainly acetic acid, were the intermediate products of the wet oxidation process and their conversion to carbon dioxide was very slow. A generalised model based on a parallel reaction scheme was used to interpret the experimental data obtained. The activation energies obtained were in the range of 90-130 kJ mol(-1).
Zerva
C
C
Department of Chemical Engineering, Chemical Process Engineering Laboratory, National Technical University of Athens, Heroon Politechniou 9, Zographou Campus, 15780, Athens, Greece.
Peschos
Z
Z
Poulopoulos
S G
SG
Philippopoulos
C J
CJ
D000438:Alcohols; D007220:Industrial Waste; D009821:Oils; D010084:Oxidation-Reduction; D010100:Oxygen; D010636:Phenols; D011312:Pressure; D013696:Temperature; D014865:Waste Disposal, Fluid
D000438:Alcohols; D007220:Industrial Waste; D009821:Oils; D010636:Phenols; D010100:Oxygen