scholarly journals Wastewater chemical contaminants: remediation by advanced oxidation processes

2018 ◽  
Vol 17 (11) ◽  
pp. 1573-1598 ◽  
Author(s):  
M. Bartolomeu ◽  
M. G. P. M. S. Neves ◽  
M. A. F. Faustino ◽  
A. Almeida
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Wastewater Remediation ◽  
Chemical Contaminants ◽  
Oxidation Processes ◽  
Novel Approaches

A review on novel approaches for wastewater remediation based on advanced oxidation processes (AOPs), including the photodynamic approach mediated by tetrapyrrolic derivatives.

Advanced Oxidation Processes for Wastewater Remediation: Fundamental Concepts to Recent Advances

2021 ◽  
pp. 37-86
Keyword(s):  
Water Treatment ◽  
Organic Pollutants ◽  
Large Scale ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Potential ◽  
Wastewater Remediation ◽  
Oxidation Processes ◽  
Sludge Disposal ◽  
Different Types

Industrialization and modernization in recent times have led to a water crisis across the world. Conventional methods of water treatment like physical, chemical and biological methods which comprise of many commonly used techniques like membrane separation, adsorption, chemical treatment etc. have been in use for many decades. However, problems like sludge disposal, high operating costs etc. have led to increased focus on Advanced Oxidation Processes (AOPs) as alternative treatment methods. AOPs basically involve reactions relying on the high oxidation potential of the hydroxyl (OH•) free radical. They have the potential to efficiently treat various toxic, organic pollutants and complete degradation of contaminants (mineralization) of emerging concern. Many different types of homogenous as well as heterogenous AOPs have been studied viz: UV/H2O2, Fenton, Photo-Fenton, Sonolysis, Photocatalysis etc. for treatment of a wide variety of organic pollutants. Different AOPs are suitable for different types of wastewater and hence proper selection of the right technique for a particular type of pollutant is required. The inherent advantages offered by AOPs like elimination of sludge disposal problems, operability under mild conditions, ability to harness sunlight, non selective nature (ability to degrade all organic and microbial contamination) etc. have made it one of the most actively researched areas in recent times for wastewater treatment. Despite the benefits and intense research, commercial applicability of AOPs as a practical technique for treating wastewater on a large scale is still far from satisfactory. Nevertheless, positive results in lab scale and pilot plant studies make them a promising water treatment technique for the future. In the present chapter, an attempt has been made to discuss all aspects of AOPs beginning with the fundamental concepts, classification, underlying mechanism, comparison, commercialization to the latest developments in AOPs.

Advanced Oxidation Processes for Wastewater Remediation: Fundamental Concepts to Recent Advances

2021 ◽  
pp. 37-86
Keyword(s):  
Water Treatment ◽  
Organic Pollutants ◽  
Large Scale ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Potential ◽  
Wastewater Remediation ◽  
Oxidation Processes ◽  
Sludge Disposal ◽  
Different Types

Industrialization and modernization in recent times have led to a water crisis across the world. Conventional methods of water treatment like physical, chemical and biological methods which comprise of many commonly used techniques like membrane separation, adsorption, chemical treatment etc. have been in use for many decades. However, problems like sludge disposal, high operating costs etc. have led to increased focus on Advanced Oxidation Processes (AOPs) as alternative treatment methods. AOPs basically involve reactions relying on the high oxidation potential of the hydroxyl (OH•) free radical. They have the potential to efficiently treat various toxic, organic pollutants and complete degradation of contaminants (mineralization) of emerging concern. Many different types of homogenous as well as heterogenous AOPs have been studied viz: UV/H2O2, Fenton, Photo-Fenton, Sonolysis, Photocatalysis etc. for treatment of a wide variety of organic pollutants. Different AOPs are suitable for different types of wastewater and hence proper selection of the right technique for a particular type of pollutant is required. The inherent advantages offered by AOPs like elimination of sludge disposal problems, operability under mild conditions, ability to harness sunlight, non selective nature (ability to degrade all organic and microbial contamination) etc. have made it one of the most actively researched areas in recent times for wastewater treatment. Despite the benefits and intense research, commercial applicability of AOPs as a practical technique for treating wastewater on a large scale is still far from satisfactory. Nevertheless, positive results in lab scale and pilot plant studies make them a promising water treatment technique for the future. In the present chapter, an attempt has been made to discuss all aspects of AOPs beginning with the fundamental concepts, classification, underlying mechanism, comparison, commercialization to the latest developments in AOPs.

scholarly journals A Review on Advanced Oxidation Processes (AOPs) for Wastewater Remediation

2020 ◽  
Vol 32 (11) ◽  
pp. 2677-2684
Author(s):  
V.S. Solanki ◽  
B. Pare ◽  
P. Gupta ◽  
S.B. Jonnalagadda ◽  
R. Shrivastava
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Critical Issue ◽  
Wastewater Remediation ◽  
Policy Makers ◽  
Oxidation Processes ◽  
The Past ◽  
Varied Chemical

In 21st century, organic and domestic wastes and discharges from varied chemical and manufacturing industries to water bodies become a critical issue and challenge for the researchers, engineers and policy makers. Advanced oxidation processes (AOPs) are efficient, sustainable, economically viable and green techniques to elimination on-degradable organic pollutants by biological and traditional processes. A number of research articles have been published from the past two decades on the wastewater treatment using various advanced oxidation processes. The main objective of this review paper is to provide the quick view for researchers, academicians and scientists in the area of wastewater treatment using various types of AOPs, which incorporate green principles involves in the processes for removal of different pollutants and contaminants including dyes, phenols, pesticides, herbicides etc. from wastewaters, with emphasis on the degradation efficiency of various photocatalysts. The formation reactions of •OH radical and the mechanisms of degradation of various organic pollutants in the wastewater is also discussed. This review covers various types of advanced oxidation processes, viz., ozone-based processes, photocatalysis and Fenton-based reactions.

Photocatalysis of γ–cyclodextrin-functionalised Fe3O4 nanoparticles for degrading Bisphenol A in polluted waters

2019 ◽  
Vol 16 (2) ◽  
pp. 125 ◽  
Author(s):  
Mariana Neamţu ◽  
Claudia Nădejde ◽  
Vasile-Dan Hodoroabă ◽  
Rudolf J. Schneider ◽  
Gabriel Ababei ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Fe3o4 Nanoparticles ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Superior Performance ◽  
Ultrapure Water ◽  
Wastewater Remediation ◽  
Oxidation Processes ◽  
Real Wastewater ◽  
Bpa Removal

Environmental contextEfficiently removing persistent organic pollutants, such as Bisphenol A, from wastewaters is essential for maintaining environmental quality. The present work applies advanced oxidation processes and the enhanced photocatalytic activity of cyclodextrin-immobilised magnetic nanoparticles for the removal of Bisphenol A under mild conditions. The study highlights the need to consider eco-friendly, safe and cost-effective approaches for the removal of persistent hazardous pollutants from wastewaters. AbstractThe efficiency, relatively low cost and eco-friendly nature of hydrogen peroxide-assisted photocatalysis treatment procedures are significant advantages over conventional techniques for wastewater remediation. Herein, we evaluate the behaviour of γ-cyclodextrin (γ-CD) immobilised on either bare or chitosan (CS)–functionalised Fe3O4 nanoparticles, for photodegrading Bisphenol A (BPA) in ultrapure water and in real wastewater samples. The BPA removal efficiencies with Fe3O4/γ-CD and Fe3O4/CS/γ-CD were compared with those of Fe3O4/β-CD, and were monitored under UVA irradiation at near-neutral pH. The addition of H2O2 at low concentrations (15mmolL−1) significantly increased BPA photodegradation in the presence of each nanocomposite. The highest catalytic activity was shown by both Fe3O4/γ-CD and Fe3O4/CS/γ-CD nanocomposites (~60 and 27% BPA removal in ultrapure water and real wastewater effluent, respectively). Our findings reveal the superior performance of γ-CD-functionalised Fe3O4 relative to that of Fe3O4/β-CD. The use of CD-based nanocomposites as photocatalytic materials could be an attractive option in the pre- or post-treatment stage of wastewaters by advanced oxidation processes before or after biological treatment.

Recent Achievements in Combination of Ultrasonolysis and Other Advanced Oxidation Processes for Wastewater Treatment

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Masroor Mohajerani ◽  
Mehrab Mehrvar ◽  
Farhad Ein-Mozaffari
Keyword(s):  
Wastewater Treatment ◽  
Advanced Oxidation Processes ◽  
Operating Cost ◽  
Synergetic Effect ◽  
Advanced Oxidation ◽  
Operating Conditions ◽  
Process Efficiency ◽  
Combined Processes ◽  
Wastewater Remediation ◽  
Oxidation Processes

A review of recent advancements in the combination of ultrasonolysis with other advanced oxidation processes is studied. This study is based on the recent achievements and developments in the field of water and wastewater treatment using ultrasonic irradiation by means of acoustic cavitation with other advanced oxidation technologies. The most important parameter in combined methods is the synergetic effect which is a variable relative to the type of contaminant(s) and other physicochemical properties. The synergetic effect has the key role in process intensification so that a higher synergetic effect provides a higher intensified process efficiency. Results showed that sonolysis is a method that can increase the synergetic percentage in lowering fixed and even operating cost of the wastewater remediation. The combination of photolysis, photocatalysis, Fenton, photo-Fenton, and ozonation processes with ultrasonolysis results in hydroxyl radical production and therefore, the degradation of the organic chemicals. The effect of various parameters on the efficiency of combined processes is investigated in the present study. The combined process performance and the synergetic effect depend on the operating conditions and wastewater characteristics. The synergetic effect can enhance the degradation of organic compounds up to 400%. For example, it has been proven that the sonophotocatalytic process shows over 80% improvement with respect to the photocatalysis alone.

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