Wet oxidation

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

Integrated oxidation process and biological treatment for highly concentrated petrochemical effluents: A review

Abstract: Biological treatments are the most widely used method in petrochemical complexes to treat wastewaters. However, they are not always effective, especially when refractory nature of certain organic contaminants is introduced into the system. A more promising method, therefore, is the one in which the biological treatment is integrated with the chemical methods where the primary contaminants are first converted into biodegradable compounds before being entered in biological treatment. This paper reviews the application of four oxidation processes that treat petrochemical waste, namely: photo-catalytic oxidation (PCO), Fenton/photo-Fenton, wet air oxidation (WAO), and catalytic wet air oxidation (CWAO), and proposes a new configuration for the treatment of petrochemical wastewaters. This configuration is established based on adding one oxidation process at the effluent of each processing unit before all the effluents are mixed into a single wastewater influent stream for the biological treatment. As the reviewed processes have different capabilities in the degradation of organic compounds and operate under diverse conditions, the selection of the oxidation process best matched to each processing unit will depend on the characteristics of the unit effluent such as organic concentration, toxicity of the effluent to biomass, temperature, and pressure, which will be thoroughly discussed in the paper.

Catalytic Wet Oxidation of Phenol with Mn−Ce-Based Oxide Catalysts: Impact of Reactive Adsorption on TOC Removal

Abstract: Catalytic wet oxidation of phenol solutions at low temperatures of 80−130 °C and space velocities of 1−100 h-1 using Mn−Ce catalysts was studied with an emphasis on the reactive adsorption mechanism and total organic carbon (TOC) removal. Eight catalysts (Mn/Ce = 6:4) were activated under different conditions and promoted with alkali metals (K, Cs) or noble metals (Pt, Ru). The compositions and physical properties of all catalysts were measured. Preliminary runs were conducted in a batch reactor, but most experiments were carried out in a continuous-flow trickle-bed reactor. Catalysts containing mixed Mn3O4−CeO2 phases pure and promoted with alkali metals displayed a higher activity and a higher adsorption of organic deposits on their surface. Noble metals had little effect on process performance. The adsorption capacity of the catalysts was found to be considerably higher than that reported for activated carbon. Furthermore, complete regeneration of a catalyst in three consecutive tests was demonstrated ...

Treatment of Tannery Wastewater by Various Oxidation and Combined Processes

Abstract: A general overview on the prospective of various oxidation and combined processes in the treatment of tannery industry effluent are reported. Various oxidation and combined processes such as UV/H2O2/Hypochlorites, Fenton and Electro-oxidation, photo-chemical, photo-catalytic, electro-catalytic oxidation, wet air oxidation, ozonation, biological followed by ozone/UV/ H2O2, coagulation or electro-coagulation and catalytic treatments have been considered. The tannery wastewater with sulphide as main sources of pollutant, electro-coagulation is the best removal efficiency process among the other oxidation processes, whereas for chromium, photo catalytic oxidation process using nano-TiO2 and wet air oxidation in the presence of manganese sulphate and activated carbon as a catalyst are more efficiency processes. The integrated combined processes described permit to meet disposal limits, health quality standards and the recovery of several chemicals utilized in the tanneries.