Advanced Oxidative Degradation Processes: Fundamentals and Applications (original) (raw)
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Advanced Oxidation Process for Wastewater Treatment: A Review
2014
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.
A Review on Wastewater Treatment Containing Organic Pollutants Using Advance Oxidation Processes
International Journal of Scientific Research in Science and Technology, 2023
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.
Recent developments in homogeneous Advanced oxidation processes for water and wastewater treatment
This paper reports on recent developments in homogeneous Advanced Oxidation Processes (AOPs) for the treatment of water and wastewater. It has already been established that AOPs are very efficient compared to conventional treatment methods for degradation and mineralization of recalcitrant pollutants present in water and wastewater. AOPs generate a powerful oxidizing agent, hydroxyl radical, which can react with most of the pollutants present in wastewater. Therefore, it is important to discuss recent developments in AOPs. The homogeneous AOPs such as O 3 , UV/O 3 , UV/O 3 /H 2 O 2 , and UV/H 2 O 2 , Fe 2+ /H 2 O 2 , UV/Fe 2+ /H 2 O 2 on the degradation of pollutants are discussed in this paper. The influence on the process efficiency of various experimental parameters such as solution pH, temperature, oxidant concentration, and the dosage of the light source is discussed. A list of contaminants used for degradation by various AOPs and the experimental conditions used for the treatment are discussed in detail.
Advanced oxidation processes (AOPs) in wastewater treatment
JOURNAL OF INDUSTRIAL AND …, 2004
Advanced oxidation processes (AOPs) were first proposed in the 1980s for drinking water treatment and later were widely studied for treatment of different wastewaters. During the AOP treatment of wastewater, hydroxyl radicals (OH•) or sulfate radicals (SO 4 •−) are generated in sufficient quantity to remove refractory organic matters, traceable organic contaminants, or certain inorganic pollutants, or to increase wastewater biodegradability as a pre-treatment prior to an ensuing biological treatment. In this paper, we review the fundamental mechanisms of radical generation in different AOPs and select landfill leachate and biologically treated municipal wastewater as model wastewaters to discuss wastewater treatment with different AOPs. Generally, the treatment efficiencies rely heavily upon the selected AOP type, physical and chemical properties of target pollutants, and operating conditions. It would be noted that other mechanisms, besides hydroxyl radical or sulfate radical-based oxidation, may occur during the AOP treatment and contribute to the reduction of target pollutants. Particularly, we summarize recent advances in the AOP treatment of landfill leachate, as well as advanced oxidation of effluent organic matters (EfOM) in biologically treated secondary effluent (BTSE) for water reuse.
ChemEngineering
Advanced oxidation procedures (AOPs) refer to a variety of technical procedures that produce OH radicals to sufficiently oxidize wastewater, organic pollutant streams, and toxic effluents from industrial, hospital, pharmaceutical and municipal wastes. Through the implementation of such procedures, the (post) treatment of such waste effluents leads to products that are more susceptible to bioremediation, are less toxic and possess less pollutant load. The basic mechanism produces free OH radicals and other reactive species such as superoxide anions, hydrogen peroxide, etc. A basic classification of AOPs is presented in this short review, analyzing the processes of UV/H2O2, Fenton and photo-Fenton, ozone-based (O3) processes, photocatalysis and sonolysis from chemical and equipment points of view to clarify the nature of the reactive species in each AOP and their advantages. Finally, combined AOP implementations are favored through the literature as an efficient solution in addressing...
Romanian Journal of Ecology & Environmental Chemistry
The degradation of some toxic pollutants like chlorobenzenes, nitrobenzene and 4-chloroaniline in various advanced oxidation system such as: UV/ H2O2, UV-VIS/Fe-TiO2 and UV-VIS/TiO2/ H2O2 were studied. The influence of working conditions (pH0, H2O2 dose, photocatalyst dose, pollutant initial concentration and irradiation time) on pollutant degradation rate constant and efficiency were investigated. For any studied advanced oxidation systems, pollutant degradation followed a pseudo first order kinetics. The degradation pathway of chlorinated and nitro aromatic pollutants includes initial •OH radicals attack to aromatic ring with hydroxylated intermediates formation, followed by their step by step oxidation up to carboxylic acids. Inorganic ions like Cl-, NO3-, NH4+ are also formed as mineralization products.
Use of selected advanced oxidation processes (AOPs) for waste-water treatmenta mini review
Global Nest J, 2008
Advanced oxidation processes (AOPs) are widely used for the removal of recalcitrant organic constituents from industrial and municipal wastewater. The aim of this study was to review the use of titanium dioxide/UV light process, hydrogen peroxide/UV light process and Fenton's reactions in wastewater treatment. The main reactions and the operating parameters (initial concentration of the target compounds, amount of oxidation agents and catalysts, nature of the wastewater etc) affecting these processes are reported, while several recent applications to wastewater treatment are presented. The advantages and drawbacks of these methods are highlighted, while some of the future challenges (decrease of operational cost, adoption of strategies for processes integration) are discussed.
Photochemical Advanced Oxidation Processes for Water and Wastewater Treatment
Advanced Oxidation Processes (AOPs) are excellent systems for remediation of contaminated wastewaters containing recalcitrant organic pollutants. The most studied AOPs are photochemical-based processes (PAOPs), as UV/hydrogen peroxide, heterogeneous photocatalysis (HP), photo-Fenton (PF), UV plus ozone and combination of these technologies. All AOPs are based on the production of very reactive species (especially hydroxyl radicals, HO • ) able to degrade or transform chemical pollutants, provoking ultimately total mineralization. One of the major drawbacks of AOPs is that the operational costs are relatively high compared to less expensive technologies such as biological treatments, use of activated carbon, etc. However, these technologies can be used combined with themselves or with conventional technologies. In spite of a huge amount of scientific publications, applications and patented methods on PAOPs are scarce. In this article, a brief review on the most used PAOPs, together with recent patents on the field are presented. The patents describe mostly inventions on HP and PF, most of them using catalysts supported on membranes, perovskites, zeolites or other materials, and combination of PAOPs with conventional technologies.