Increasing biodegradability of a real amine-contaminated spent caustic problematic stream through WAO and CWAO oxidation using a high specific surface catalyst from petcoke

Enhanced photocatalytic activity of single-atom Au1/TiO2 catalysts prepared using cold plasma

“…3,4 Currently, some physicochemical techniques have been used to remove organic matter-containing wastewater, including adsorption, 5 biological treatment, 6 and membrane separation. 7 Nonetheless, these treatment methods often encounter issues such as limited treatment capacity, elevated energy consumption, and the risk of secondary pollution. 4 In recent years, photocatalytic advanced oxidation technology has shown potential advantages due to its mild reaction conditions, speed and efficiency, and absence of secondary pollutants.…”

In situ growth of an ultrathin Cu/g-C3N4 coating over SBA-15 for catalytic wet air oxidation of pollutants under extremely mild conditions

“…Catalytic wet air oxidation (CWAO) is an efficient technology to degrade refractory contaminants in wastewaters [1][2][3] because it uses dioxygen or air as the oxidizing agent and could be used for a wide spectrum of pollutants. 4 For example, CWAO demonstrated excellent chemical oxygen demand (COD) removal efficiency in oxidative degradation of wastewaters that contain phenolics, 5,6 dyes, 7,8 organic acids, 9 landfill leachate, 10,11 microplastics, 12 antibiotics, 13 amines and sulfides, 14 and others, all of which are recalcitrant to be degraded biochemically. In spite of the significant advancements achieved to date, there are still numerous obstacles in the CWAO industrial application.…”

Treatment of Highly Alkaline Industrial Organic Raffinate Containing Pyridine and Its Derivatives by Coupling of Catalytic Wet Air Oxidation and Biological Processes

“…17 Gutieŕrez-Sańchez et al studied the degradation of ciprofloxacin in aqueous solution using sewage sludge-derived activated carbon (SAC) loaded with iron nanoparticles and reported 99% ciprofloxacin degradation (initial concentration 50 mg/L) within 2 h at 140 °C and 20 bar (air pressure) with a catalyst dosage of 0.7 g/L. 18 Ayalkie Gizaw and Gabbiye Habtu studied the degradation of reactive red 2 (mono azo) dye in aqueous solution using copper oxide-loaded activated carbon catalysts. They reported a color and chemical oxygen demand (COD) removal efficiency of 100 and 88.57%, respectively, in 120 min with a catalyst dose of 6 g/L at 120 °C and 3 bar (oxygen partial pressure) for 100 mg/L dye solution.…”

“…However, after WAO at 250 °C and 50 bar, the biodegradability of the treated effluent was 50%. Furthermore, after CWAO using carbon-based petroleum coke catalysts at 250 °C and 50 bar, the biodegradability of the treated effluent was found to be 70% . Kang et al studied the treatment of toxic wastewater generated from the production of Vitamin B 6 (BOD 5 /COD = 0.1) using the coupling of CWAO and biological processes.…”