Wet Air Oxidation of Oily Sludge

Abstract

The article is inclined to report experimental results performed in a batch reactor on the wet air oxidation of oily sludge. It is shown that increasing the reaction temperature can improve chemical oxygen demand (COD) removal significantly, increasing O 2 excess (OE), initial concentration of oily sludge and prolonging reaction time can help to improve the chemical oxygen demand (COD) removal. COD removal is 96.15% under the optimal condition. It is concluded that wet air oxidation is an effective process for removing organic compounds from oily sludge. The intermediate product such as acetic acid (CH 3 COOH), carbon monoxide (CO), and the final product such as carbon dioxide (CO 2 ) is analyzed by liquid chromatography and gas chromatography in the experiment.

Treatment of Oil Sands’ Mature Fine Tailings Using Advanced Wet Air Oxidation (WAO) and Wet Air Peroxide Oxidation (WAPO)

“…Increasing temperature not only yields and produces higher COD removal ratios but also achieves faster degradation of organic compounds. This is because higher temperature increases the rate constant of the radicals, enhancing their reaction with organic compounds towards degradation [20][21][22]. At 200 • C and 3.4 MPa, the oxidation caused desorption of the residual bitumen that was stuck to soil particles, releasing trapped water and a layer of bitumen froth on top of the water layer (Figure S2).…”

“…WAO can treat a variety of contaminants at the same time, and the destruction of pollutants takes place in the liquid phase, thus reducing any air pollutants. This technology is well-suited for wastewaters with suspended solids that are too diluted for incineration and not biodegradable, such as sludge wastes [19] including oily sludges [20][21][22]. Additionally, WAO has also previously been applied to the treatment of a variety of industrial wastewaters including those of pulp and paper [23], dyes [24], pharmaceuticals [25], olive oil mills [26], and the petrochemical industry [27] as well as phenol and its derivatives [28].…”