Advanced oxidation processes holds a promising future for the treatment of wastewater containing organic compounds that are not easily removable. All AOPs are designed to produce hydroxyl radicals. It is the hydroxyl radical that reacts to disintegrate organic compounds. AOP combine ozone, UV, hydrogen peroxide and/or catalyst to offer effective wastewater treatment solution for the reduction and/or removal of residual organic compounds that are measured by COD, BOD or TOC. This paper presents basic review of efficient AOPs developed to decolorize and/or degrade organic pollutants for environmental protection. Fundamentals of typical methods such as fenton, electro-fenton and photo-fenton, are discussed.

Advanced oxidation processes (AOPs) are the technologies that generally use the hydroxyl radicals, the ultimate oxidant for the remediation of organic contaminants in wastewater. These are highly effective novel methods speeding up the oxidation process. AOPs can combine with Fenton (H2O2/Fe2+), photo-Fenton (H2O2/UV/Fe2+), and electro-Fenton, heterogeneous photooxidation using titanium dioxide (TiO2/hv), singlet molecular oxygen process, singlet oxygen-photo-Fenton process, sonolysis, peroxidation combined with ultraviolet light (H2O2/UV), UV alone, UV/O3, UV/S2O8-2, UV/Chlorine, peroxone (O3/H2O2), peroxone combined with ultraviolet light (O3/H2O2/UV), O3/UV system, O3/TiO2/ H2O2 and O3/TiO2/Electron beam irradiation. Ozone (O3), catalyst or ultraviolet (UV) irradiation to offer a powerful treatment processes of wastewater. Future research should be focused on enhancing the properties of heterogeneous catalysts in AOPs. This review report of different AOPs utilized for the removal of various phenolic compounds and textile dyes in wastewater.

Wastewater treatment for industrial effluent can be carried out by various physical, chemical and biological treatment methods. For removal of various organic and inorganic pollutants various advanced methods are used with good effect. The general strategy of this study was based on applying Advanced Oxidation Process (AOP) of (UV/O3) for reduction of COD of effluent wastewater. Various parameters affect the oxidation process such as pH, Ozone dose and exposure time of UV. The optimized conditions were found to be pH: 7, the ozone dose of 4gm/hr and 60 min UV exposure. Finally, chemical oxygen demands (COD), before and after oxidation process was measured to ensure the entire destruction of organic load. Krishna D. Ladwani, Kiran D. Ladwani 1* , Dilip S. Ramteke 1 , Farhin Inam 2 1 Environmental Impact and Risk Assessment Division, National Environmental Engineering Research Institute (NEERI), Nagpur 440-020 2 Department of Chemistry, Institute of Science, Nagpur 440-008, India. Sub...

Advanced Oxidation Processes (AOPs) have emerged as a promising technology for the treatment of wastewaters containing toxic, recalcitrant organic compounds such as dyes, pesticides etc. This review paper focuses on the Fenton and photo- Fenton technique which is one of the most efficient AOPs developed to decolorize and/or degrade organic pollutants. This oxidation method can produce biodegradable intermediates and mineralize complex organic pollutants effectively and efficiently. In this paper Fenton and photo-Fenton methods are categorised into two broad groups as homogeneous and heterogeneous Fenton and photo-Fenton processes. Applications of fundamental and advanced combined Fenton and photo-Fenton processes are also discussed.

Patru conferințe la Universitatea - Radio