The impact of chloride or bromide ions on the advanced oxidation of atrazine by combined electrolysis and ozonation

2019 ◽  
Vol 7 (3) ◽  
pp. 103105
Author(s):  
Greg L. Saylor ◽  
Margaret J. Kupferle
Keyword(s):  
Advanced Oxidation ◽  
Bromide Ions ◽  
The Impact

An investigation into advanced oxidation of three chlorophenoxy pesticides in surface water

2009 ◽  
Vol 59 (8) ◽  
pp. 1665-1671 ◽  
Author(s):  
Jitka MacAdam ◽  
Simon A. Parsons
Keyword(s):  
Surface Water ◽  
Effective Treatment ◽  
Surface Waters ◽  
Advanced Oxidation ◽  
Pesticide Degradation ◽  
Fenton's Reagent ◽  
Pesticide Concentration ◽  
Low Levels ◽  
Stoichiometric Ratios ◽  
The Impact

The performance of Fenton's reagent in removing 2,4-D, MCPA and mecoprop from surface water has been evaluated here. Initial trials were undertaken at a pesticide concentration of 4.5 × 10−5 mol l−1 in deionised water at pH 3 and two different stoichiometric ratios of pesticide: Fe(II): H2O2 (1:1:10, 1:10:10) were evaluated. At the 1:1:10 ratio, ∼10 minutes were required to achieve a 50% removal of the pesticide. At the higher ratio the removal achieved after 1 minute, was >90%. Subsequent experiments studied the performance of Fenton (4.5 × 10−4 mol l−1 Fe(II): 4.5 × 10−4 mol l−1 H2O2) in surface water spiked with pesticides and the impact of pH on the rate and degree of pesticide degradation was investigated. The removal was significantly improved at pH 3 in comparison to pH 6.5. The effect of Fenton on DOC removal from surface water was followed. Experiments investigated the performance of Fenton at pesticide concentrations of 7.5 × 10−9 mol l−1 in surface water. Fenton was shown to be an effective treatment for removing low levels of pesticides from surface waters at pH 3 & 4.

The impact of H 2 O 2 and the role of mineralization in biodegradation or ecotoxicity assessment of advanced oxidation processes

2018 ◽  
Vol 144 ◽  
pp. 361-366 ◽  
Author(s):  
Gyuri Sági ◽  
Anikó Bezsenyi ◽  
Krisztina Kovács ◽  
Szandra Klátyik ◽  
Béla Darvas ◽  
...  
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
The Impact

scholarly journals Advanced Oxidation Processes and Biotechnological Alternatives for the Treatment of Tannery Wastewater

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3222
Author(s):  
Néstor Andrés Urbina-Suarez ◽  
Fiderman Machuca-Martínez ◽  
Andrés F. Barajas-Solano
Keyword(s):  
Advanced Oxidation Processes ◽  
Liquid Waste ◽  
Value Added ◽  
Advanced Oxidation ◽  
Tannery Wastewater ◽  
Economic Sectors ◽  
Oxidation Processes ◽  
Physicochemical Composition ◽  
The Impact ◽  
Alternative Solutions

The tannery industry is one of the economic sectors that contributes to the development of different countries. Globally, Europe and Asia are the main producers of this industry, although Latin America and Africa have been growing considerably in recent years. With this growth, the negative environmental impacts towards different ecosystem resources as a result of the discharges of recalcitrated pollutants, have led to different investigations to generate alternative solutions. Worldwide, different technologies have been studied to address this problem, biological and physicochemical processes have been widely studied, presenting drawbacks with some recalcitrant compounds. This review provides a context on the different existing technologies for the treatment of tannery wastewater, analyzing the physicochemical composition of this liquid waste, the impact it generates on human health and ecosystems and the advances in the different existing technologies, focusing on advanced oxidation processes and the use of microalgae. The coupling of advanced oxidation processes with biological processes, mainly microalgae, is seen as a viable biotechnological strategy, not only for the removal of pollutants, but also to obtain value-added products with potential use in the biorefining of the biomass.

The impact of background organic matter and alkalinity on the degradation of the pesticide metaldehyde by two advanced oxidation processes: UV/H2O2 and UV/TiO2

2013 ◽  
Vol 47 (6) ◽  
pp. 2041-2049 ◽  
Author(s):  
Olivier Autin ◽  
Julie Hart ◽  
Peter Jarvis ◽  
Jitka MacAdam ◽  
Simon A. Parsons ◽  
...  
Keyword(s):  
Organic Matter ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
The Impact

The impact of groundwater quality on the removal of methyl tertiary-butyl ether (MTBE) using advanced oxidation technology

2009 ◽  
Vol 60 (8) ◽  
pp. 2161-2165 ◽  
Author(s):  
B. Tawabini ◽  
N. Fayad ◽  
M. Morsy
Keyword(s):  
Advanced Oxidation ◽  
Molar Ratio ◽  
Methyl Tertiary Butyl Ether ◽  
Butyl Ether ◽  
H2o2 Treatment ◽  
Tertiary Butyl ◽  
Inorganic Species ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
The Impact

In this study, the removal of methyl tertiary-butyl ether (MTBE) from contaminated groundwater using advanced oxidation technology was investigated. The UV/H2O2 treatment process was applied to remove MTBE from two Saudi groundwater sources that have different quality characteristics with regard to their contents of inorganic species such as chloride, bromide, sulfates and alkalinity. MTBE was spiked into water samples collected from the two sources to a concentration level of about 250 μg/L. A 500 mL bench-scale forced-liquid circulation photoreactor was used to conduct the experiments. Two different UV lamps were utilized: 15 Watt low pressure (LP) and 150 Watt medium pressure (MP). Results of the study showed that the UV/H2O2 process removed more than 90% of MTBE in 20 minutes when the MP lamp was used at an MTBE/H2O2 molar ratio of 1:200. The results also showed that groundwater sources with higher levels of radical scavengers such as alkalinity, bromide, nitrate and sulfate showed lower rate of MTBE removal.

The fate of natural organic matter during UV/H2O2 advanced oxidation of drinking waterA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (1) ◽  
pp. 160-169 ◽  
Author(s):  
Siva Sarathy ◽  
Madjid Mohseni
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Natural Organic Matter ◽  
Partial Oxidation ◽  
Ring Opening ◽  
Spectral Characteristics ◽  
Advanced Oxidation ◽  
Aromatic Substitution ◽  
Carbon Structures ◽  
The Impact

At conditions within the range of those typically applied for commercial drinking water applications, the impact of ultraviolet and hydrogen peroxide (UV/H2O2) advanced oxidation (AO) on the concentration, spectral characteristics, hydrophobicity, and biodegradability of natural organic matter (NOM) in a raw surface water and ultrafiltered surface water was studied. At an initial H2O2 dose of 20 mg L–1, UV/H2O2 mineralized less than 15% of the NOM in raw surface water at a fluence of 1500 mJ cm–2. Natural organic matter in ultrafiltered surface water was mineralized by at least 27% after about 1500 mJ cm–2. Partial oxidation of NOM led to ring opening of aromatic structures, cleavage of conjugated double bonded carbon structures, and reduction in the degree of aromatic substitution. The UV/H2O2 AO preferentially reacted with hydrophobic fractions of NOM leading to the formation of hydrophilic products. The treatment oxidized recalcitrant NOM into more readily biodegradable compounds with significant increases in formaldehyde and acetaldehyde concentrations. Depending on NOM properties for a given water, UV/H2O2 AO may cause partial oxidation of NOM leading to the formation of biodegradable compounds. The presence of these species may need to be addressed with a downstream process capable of improving biological stability.

Pilot scale testing of advanced oxidation processes for degradation of geosmin and MIB in recirculated aquaculture

2010 ◽  
Vol 10 (2) ◽  
pp. 217-225 ◽  
Author(s):  
M. M. Klausen ◽  
O. Grønborg
Keyword(s):  
Advanced Oxidation Processes ◽  
Negative Impact ◽  
Tap Water ◽  
Advanced Oxidation ◽  
Pilot Scale ◽  
Oxidation Processes ◽  
Water Matrix ◽  
Degradation Rates ◽  
Increased Risk ◽  
The Impact

The presence of geosmin and 2-methylisoborneol (MIB) in recirculated aquaculture systems has a significant negative impact on the fish production due to poor flavour quality of produced fish and increased risk of rejection by fish processers. Advanced Oxidation Processes has a high potential for removal of geosmin and MIB in water and in this study UV/H2O2 and UV/O3 has been tested in pilot scale in real aquaculture process water. First order degradations constants were between 0.6 (UV/O3) and 1.2 (UV/H2O2) h−1 for geosmin and 1.3 (UV/O3)–1.5 (UV/H2O2) h−1 for MIB. This corresponded to average half-lives between 34–69 minutes for geosmin and between 28–32 minutes for MIB. These values were one order of magnitude higher than previously reported for degradation of geosmin and MIB in demineralised and tap-water. The slower degradation rates were caused by competitive and inhibitive processes from the water matrix. The influence of the water matrix also caused increased energy consumption with EEO values 16 to 38 times higher than previously reported for geosmin and MIB removal in tap water. Improved feasibility of removing geosmin and MIB in recirculated aquaculture systems by AOPs requires pre-treatment to minimize the impact of the water matrix on the degradation kinetics.

scholarly journals A Review of Manganese(III) (Oxyhydr)Oxides Use in Advanced Oxidation Processes

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5748
Author(s):  
Daqing Jia ◽  
Khalil Hanna ◽  
Gilles Mailhot ◽  
Marcello Brigante
Keyword(s):  
Singlet Oxygen ◽  
Advanced Oxidation Processes ◽  
Inorganic Ions ◽  
Advanced Oxidation ◽  
Solution Ph ◽  
Oxidation Processes ◽  
Treatment Processes ◽  
Activation Mechanisms ◽  
The Impact

The key role of trivalent manganese (Mn(III)) species in promoting sulfate radical-based advanced oxidation processes (SR-AOPs) has recently attracted increasing attention. This review provides a comprehensive summary of Mn(III) (oxyhydr)oxide-based catalysts used to activate peroxymonosulfate (PMS) and peroxydisulfate (PDS) in water. The crystal structures of different Mn(III) (oxyhydr)oxides (such as α-Mn2O3, γ-MnOOH, and Mn3O4) are first introduced. Then the impact of the catalyst structure and composition on the activation mechanisms are discussed, as well as the effects of solution pH and inorganic ions. In the Mn(III) (oxyhydr)oxide activated SR-AOPs systems, the activation mechanisms of PMS and PDS are different. For example, both radical (such as sulfate and hydroxyl radical) and non-radical (singlet oxygen) were generated by Mn(III) (oxyhydr)oxide activated PMS. In comparison, the activation of PDS by α-Mn2O3 and γ-MnOOH preferred to form the singlet oxygen and catalyst surface activated complex to remove the organic pollutants. Finally, research gaps are discussed to suggest future directions in context of applying radical-based advanced oxidation in wastewater treatment processes.

scholarly journals Removal of Hydrogen Peroxide Residuals and By-Product Bromate from Advanced Oxidation Processes by Granular Activated Carbon

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2460
Author(s):  
Feifei Wang ◽  
Lu Zhang ◽  
Liangfu Wei ◽  
Jan Peter van der Hoek
Keyword(s):  
Activated Carbon ◽  
Ambient Temperature ◽  
Functional Groups ◽  
Advanced Oxidation Process ◽  
Dominant Role ◽  
Drinking Water Treatment ◽  
Advanced Oxidation ◽  
Granular Activated Carbon ◽  
Surface Functional Groups ◽  
The Impact

During drinking water treatment, advanced oxidation process (AOP) with O3 and H2O2 may result in by-products, residual H2O2 and BrO3−. The water containing H2O2 and BrO3− often flows into subsequent granular activated carbon (GAC) filters. A concentrated H2O2 solution can be used as GAC modification reagent at 60 °C to improve its adsorption ability. However, whether low concentrations of H2O2 residuals from AOP can modify GAC, and the impact of H2O2 residuals on BrO3− removal by the subsequent GAC filter at ambient temperature, is unknown. This study evaluated the modification of GAC surface functional groups by residual H2O2 and its effect on BrO3− removal by GAC. Results showed that both H2O2 and BrO3− were effectively removed by virgin GAC, while pre-loaded and regenerated GACs removed H2O2 but not BrO3− anymore. At the ambient temperature 150 µmol/L H2O2 residuals consumed large amounts of functional groups, which resulted in the decrease of BrO3− removal by virgin GAC in the presence of H2O2 residuals. Redox reactions between BrO3− and surface functional groups played a dominant role in BrO3− removal by GAC, and only a small amount of BrO3− was removed by GAC adsorption. The higher the pH, the less BrO3− removal and the more H2O2 removal was observed.

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