Topic
Wet oxidation
About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.
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TL;DR: In this article, the authors employed wet air oxidation (WAO) for treating high concentration chemical wastewater containing phenol and/or phenolic compounds and found that over 90% removal of phenol or phenolic compound can be efficiently achieved in the WAO process.
Abstract: Wet air oxidation (WAO) is employed in this work for treating high concentration chemical wastewater containing phenol and/or phenolic compounds. Experimental results indicate that over 90% removal of phenol or phenolic compounds can be efficiently achieved in the WAO process. Despite of the high treatment efficiency of the WAO process, the treated wastewater, however, still retains relatively high chemical oxygen demand (COD) concentration and does not meet the safe discharge standard. Hence further treatment of the WAO treated wastewater by an aerobic biological treatment using acclimatized activated sludge is necessary. It is found in the present studies that the combined process, if appropriately operated, is capable of drastically reducing the COD concentration of the high concentration chemical wastewater to meet the safe discharge requirement. The operating conditions of the combined process are investigated to determine their respective effects on the overall treatment efficiency. The experimental...
32 citations
TL;DR: In this article, the authors established a thiocyanate wet oxidation pathway on the basis of the reaction intermediates and final oxidation products identified during the experimental work, and fitted the oxidation reaction results to a first-order kinetic equation with respect to thioyanate and to 0.81 with res...
Abstract: Aqueous solutions of thiocyanate were oxidized in a semi-batch reactor at temperatures between 170 and 210 °C and system total pressures ranging from 70 to 100 atm. The initial pH of the solution was set at 12, while initial concentrations have ranged between 20 and 1000 ppm according to the typical concentrations of thiocyanate-containing wastewater. The kinetic data discussion was based on the establishment of a kinetic regime control that guaranteed the validity of the experimental data and that oxygen excess was assured for all the runs. An attempt to establish a thiocyanate wet oxidation pathway has been made on the basis of the reaction intermediates and final oxidation products identified during the experimental work. SO42- and CO3- have been pointed out as the main final reaction products whereas (SCN)2 and SCNO- are suggested as possible short-life oxidation intermediates. The oxidation reaction results were fitted to a first-order kinetic equation with respect to thiocyanate and to 0.81 with res...
32 citations
TL;DR: It is suggested that during the reaction the Fe3+ cations coordinated in octahedral sites in the ZnFe(2-x)Al(x)O(4) catalysts are resistant to acid leaching, but the reduced Fe2- cations become much more labile, leading to increased Fe leaching.
32 citations
TL;DR: A new technique is proposed to analyse a complex process of wet oxidation of excess sewage sludge by separating thermohydrolysis that results in the separation of sewageSludge into hydrolysates: solid and liquid products, from the basic process of oxidation of the two products.
32 citations
TL;DR: In this paper, the effects of chemical pretreatments of the support on CO oxidation over the activated carbon-supported Wacker-type catalyst were studied, and the dispersion of active phase and chemical environment of CO oxidation catalysts were investigated by X-ray Photoelectron Spectroscopy (XPS) and temperature-programmed reduction (TPR).
32 citations