Wet oxidation

About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.

Kinetics of Wet Air Oxidation of High-Strength Industrial Wastewater

Abstract: Treatment of high-strength desizing wastewater obtained from a textile dyeing and finishing plant by wet air oxidation (WAO) is studied. Experiments were conducted to investigate the effects of the...

Heterogeneous Photocatalysis for Water Purification: Prospects and Problems

Abstract: Heterogeneous photocatalysis has demonstrated the complete wet oxidation (mineralization) of a number of common contaminants of water supplies, especially halogenated alkanes, alkenes, and aromatics. We review these recent results, including influence of reactant concentration, product inhibition, intermediate formation and disappearance, synthetic vs. solar illumination, and kinetic rate forms, and discuss prospects and problems for future essays.

Wet Oxidation of Thiocyanate under Different pH Conditions: Kinetics and Mechanistic Analysis

Abstract: The wet oxidation of thiocyanate has been investigated in a 1-L semibatch reactor at temperatures in the range of 438.15−468.15 K and total pressures between 2.0 × 103 kPa and 8.1 × 103 kPa. The initial pH value of the reaction media was varied between pH 2 and pH 12 and was found to be a key parameter in the rate of thiocyanate degradation. The evolution of concentration of substrate and products (sulfate and ammonium) were analyzed. Based on the experimental data and bibliography information, a kinetic model was obtained and, here, possible pathways, depending on the initial pH of the media, are suggested for thiocyanate oxidation.

Assessment of phenol wet oxidation on CuO/γ-Al2O3 catalysts: Competition between heterogeneous and leached-copper homogeneous reaction paths

Abstract: Wastewaters containing phenol and related compounds are refractory to biological treatments. Wet air oxidation has been proposed as an alternative. The replacement of the usual homogeneous catalysts by heterogeneous ones would be of great economic and operational benefits. The reaction has been studied in a batch reactor, at different operating conditions (temperature, phenol concentration, and pH), using CuO/γ–Al 2 O 3 as catalyst). The catalyst stability decreases due to copper leaching, solid polymer deposition on the catalyst surface and changes of the catalyst structure. Copper leaching is produced when pH decreases as a consequence of the short chain acids (oxalic and maleic acid) generated during the reaction. The deposition of solid polymer is caused by the reaction of phenol oxidation intermediates. Copper leaching is considerably reduced when pH is controlled during the reaction: at pH 7 and 10, leaching takes place at very low extent (less than 2% catalyst loss). Based on a detailed model for the homogeneous wet air oxidation, it can be concluded that dissolved copper undoubtedly contributes, even in low concentration, to the overall phenol conversion. The homogeneous reaction was found to be considerably faster than the heterogeneous one.