Electrochemical oxidation Mass transfer Biomass Environment Oxidation Modelling Hydrophobic VOC Azo dyes Ageing Air treatment Metronidazole Magnetite Modeling Carbamazepine Volatile organic compounds Synergetic effect Hydrogen peroxide TiO2 Water Silicone oil Methylene blue Electro-Fenton process Ozone Toluene Carbon felt electrode Activated sludge Packing material Electro-Fenton VOC Isotherms Photocatalysis Soil Absorption Removal Desalination Ionic liquids Sulfamethazine Ultrafiltration Polyamide Isotherm Biological treatment Electroreduction Sorption Toxicity Azo dye Tetracycline Fenton Nanofiltration Antibiotics Heavy metals Nanoparticles Cyclic voltammetry Advanced oxidation process Combined processes Biodegradability Response surface methodology Mineralization Chemical scrubbing DFT Characterization Organic solvent nanofiltration Microfiltration Fouling Pesticides Kinetics Wastewater treatment Chemical oxidation Fermentation Kinetic Biogas Membrane Persulfate Biofiltration Continuous reactor Adsorption Advanced oxidation processes Combined process Central composite design Dye Water treatment Biodegradation Activated carbon Wastewater VOCs Optimization Degradation Volatile organic compound Graphite felt Coupling process Biosorption Dyes Ethanol Filtration Electrocoagulation Mass-transfer Disinfection Kinetic models Granular activated carbon Cleaning Clofibric acid