Degradation of the endocrine disruptor carbofuran by UV, O3 and O3/UV

2007 ◽  
Vol 55 (12) ◽  
pp. 275-280 ◽  
Author(s):  
T.K. Lau ◽  
W. Chu ◽  
N. Graham
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Alkaline Ph ◽  
Endocrine Disrupting Chemical ◽  
Treatment Processes ◽  
Ph Dependency ◽  
Endocrine Disrupting ◽  
Initial Ph ◽  
Two Stages ◽  
Ozonation Process

The photodegradation of a carbamate insecticide, Carbofuran (CBF), which has been recognised as a potential endocrine disrupting chemical, was studied via different wastewater treatment processes. This study has shown the efficiency of advanced oxidation process, AOP (UV/O3) than those of the direct UV photolysis and ozonation process, by completely removing 0.2 mM CBF and achieving 24% mineralisation within 30 min. The initial decay of CBF by UV/O3 accelerated from 0.05 to 0.16 min−1 as the initial pH increasing from 3.0 to 11.3. The pH-dependency of CBF has also been shown in both ozonation and UV/O3 process. A linear relationship could be found for the latter process in all pH, while for the former process, two stages of reactions (steady and accelerating) were found in the acidic and alkaline pH condition, respectively.

Radicals induced from peroxomonosulfate by nanoscale zero-valent copper in the acidic solution

2016 ◽  
Vol 74 (8) ◽  
pp. 1946-1952 ◽  
Author(s):  
Peng Zhou ◽  
Bei Liu ◽  
Jing Zhang ◽  
Yongli Zhang ◽  
Gucheng Zhang ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Acidic Solution ◽  
Butyl Alcohol ◽  
First Order ◽  
First Order Kinetics ◽  
Tert Butyl Alcohol ◽  
Initial Ph ◽  
Reactive Radicals ◽  
Reactive Oxidant

A highly efficient advanced oxidation process for the degradation of benzoic acid (BA) during activation of peroxomonosulfate (PMS) by nanoscale zero-valent copper (nZVC) in acidic solution is reported. BA degradation was almost completely achieved after 10 min in the nZVC/PMS process at initial pH 3.0. PMS could accelerate the corrosion of nZVC in acidic to release Cu+ which can further activate PMS to produce reactive radicals. Both sulfate radical (SO4−•) and hydroxyl radical (•OH) were considered as the primary reactive oxidant in the nZVC/PMS process with the experiments of methyl (MA) and tert-butyl alcohol quenching. Acidic condition (initial pH ≤ 3.0) facilitated BA degradation and pH is a decisive factor to affect the oxidation capacity in the nZVC/PMS process. Moreover, BA degradation in the nZVC/PMS process followed the pseudo-first-order kinetics, and BA degradation efficiency increased with the increase of the nZVC dosage.

scholarly journals Removing The Acid Orange 12 Azo Dye from Aqueous Solution Using Sodium Hypochlorite, A Kinetic and Thermodynamic Study

2022 ◽  
Vol 961 (1) ◽  
pp. 012056
Author(s):  
A. B. Hameed ◽  
A. B. Dekhyl ◽  
W. M. Sh. Alabdraba
Keyword(s):  
Removal Efficiency ◽  
Sodium Hypochlorite ◽  
Azo Dye ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Batch Reactor ◽  
Solution Temperature ◽  
Acid Orange ◽  
Initial Ph ◽  
Time Required

Abstract This study investigated the feasibility of using sodium hypochlorite as an advanced oxidation process to remove Acid Orange 12 azo dye from wastewater. For this purpose, batch reactor experiments were done. Several variables to address the efficiency of using this process were considered. These variables are initial pH (5, 7, and 9), the concentration of hypochlorite (50 – 250 mg/l), temperature (20-50) degrees Celsius, and time of electrolysis (1-75) min. also investigate the effects of UV on the process was done. Experimental results showed that the color removal efficiency using NaOCl with UV is more effective than NaOCl alone. The highest removal efficiency was obtained by increasing the concentration of NaOCl from (50-250mg/l) at PH=5. When the solution temperature was increased from (20-50) °C, the removal efficiency increased, and at the same time, the time required was reduced from (20-5) minutes to obtain the highest removal efficiency. The kinetic study also showed that the oxidation process follows a second-order reaction. The thermodynamic functions indicate that the response is spontaneous, endothermic, and increases randomness.

scholarly journals Hydrothermal synthesis of magnetic nano-CoFe2O4 catalyst and its enhanced degradation of amoxicillin by activated permonosulfate

2021 ◽  
Author(s):  
Xiaoyan Li ◽  
Hongwei Wang ◽  
Guozhen Zhang ◽  
Tianhong Zhou ◽  
Fuping Wu
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ph Value ◽  
Engineering Application ◽  
Degradation Pathway ◽  
Active Species ◽  
Initial Ph ◽  
Practical Engineering ◽  
Low Efficiency ◽  
Polluted Wastewater

Abstract Advanced oxidation process (AOP) has attracted widespread attention because it can effectively remove antibiotics in water, but its practical engineering application is limited by the problems of the low efficiency and difficult recovery of the catalyst. In the study, nano-spinel CoFe2O4 was prepared by hydrothermal method and served as the peroxymonosulfate (PMS) catalyst to degrade antibiotic amoxicillin (AMX). The reaction parameters such as CoFe2O4 dosage, AMX concentration, and initial pH value were also optimized. The reaction mechanism was proposed through free radical capture experiment and possible degradation pathway analysis. In addition, the magnetic recovery performance and stability of the catalyst were evaluated. Results showed that 85.5% of AMX could be removed within 90 min at optimal conditions. Sulfate radicals and hydroxyl radicals were the active species for AMX degradation. Moreover, the catalyst showed excellent magnetism and stability in the cycle experiment, which has great potential in the AOP treatment of antibiotic polluted wastewater.

Optimum and Efficiency of Chloramphenicol Degradation by UV/H2O2 Process

2013 ◽  
Vol 838-841 ◽  
pp. 2677-2680 ◽  
Author(s):  
Yan Bo Li ◽  
Cui Ping Wang ◽  
Ming Yue Zheng ◽  
Kai Jun Wang
Keyword(s):  
Reaction Time ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ph Value ◽  
Advanced Oxidation ◽  
Degradation Efficiency ◽  
Complete Degradation ◽  
Initial Ph ◽  
Operation Parameters

Degradation of chloramphenicol (CAP) by an advanced oxidation process, UV/H2O2, was investigated. Firstly, effect of H2O2 concentration, initial pH value, K2S2O8 concentration and reaction time on chloramphenicol degradation by UV/H2O2 process was studied. In addition, all the operation parameters mentioned above were optimized. The results showed that the degradation efficiency of CAP can be obviously enhanced with increasing both H2O2 concentration and K2S2O8 concentration. Moreover, initial pH value had unapparent impact on the efficiency of chloramphenicol degradation. Nearly complete degradation of chloramphenicol was achieved under the conditions of H2O2 concentration 2mM, initial pH value 7.7, K2S2O8 concentration 1mM and reaction time 15min.

scholarly journals The performance and decolourization kinetics of O3/H2O2 oxidation of reactive green 19 dye in wastewater

2018 ◽  
Vol 34 ◽  
pp. 02039
Author(s):  
S. N. Sabri ◽  
C. Z. A. Abidin ◽  
Fahmi ◽  
S.H. Kow ◽  
N. A. Razali
Keyword(s):  
Organic Contaminants ◽  
Contact Time ◽  
Advanced Oxidation Process ◽  
Initial Dosage ◽  
Oxygen Demand ◽  
Advanced Oxidation ◽  
Operational Parameters ◽  
Initial Ph ◽  
Reactive Green 19 ◽  
Two Stages

The degradations characteristic of azo dye Reactive Green 19 (RG19) was investigated using advanced oxidation process (AOPs). It was evaluated based on colour and chemical oxygen demand (COD) removal. The effect of operational parameters such as initial dye concentration, initial dosage of hydrogen peroxide (H2O2), contact time, and pH was also being studied. The samples were treated by ozonation (O3) and peroxone O3/H2O2 process. Advanced oxidation processes (AOPs) involve two stages of oxidation; firstly is the formation of strong oxidant and secondly the reaction of organic contaminants in water. In addition, the term advanced oxidation is referring to the processes in which oxidation of organic contaminants occurs primarily through reactions with hydroxyl radicals. There are several analyses that use to determine the efficiency of the treatment process, which are UV-Vis absorption spectra, COD, Fourier Transform Infrared (FT-IR), and pH. The results demonstrated that the ozone oxidation was efficient in decolourization and good in mineralization, based on the reduction of colour and COD. Additionally, results indicate that H2O2 is able to perform better than ozonation in order to decolourize the dye wastewater with 0.5 mL H2O2/L dye dosage of H2O2 at different initial concentration, initial pH, with contact time.

scholarly journals Calcite Mineral Catalyst Capable of Enhancing Micropollutant Degradation during the Ozonation Process at pH7

2020 ◽  
Vol 2 (1) ◽  
pp. 26
Author(s):  
Savvina Psaltou ◽  
Efthimia Kaprara ◽  
Manassis Mitrakas ◽  
Anastasios Zouboulis
Keyword(s):  
Reaction Time ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Catalytic Ozonation ◽  
Batch Mode ◽  
Heterogeneous Catalytic ◽  
Physico Chemical ◽  
Oxidative Species ◽  
Ozonation Process

Catalytic ozonation is an Advanced Oxidation Process (AOPs) based on the production of hydroxyl radicals, which are very reactive oxidative species. The aim of this study is to evaluate the catalytic activity of calcite on the ozonation of four different typical micropollutants (atrazine, benzotriazole, carbamazepine, and p-CBA) at pH 7 and for low initial concentrations (4 μΜ) by performing batch mode experiments. These compounds have different physico-chemical characteristics, as well as different rate constants, when reacting with ozone and hydroxyl radicals (•OH), being in the range of <0.15 − 3 × 105 M−1s−1 and 2.4 − 8.8 × 109 M−1s−1, respectively. It was found that most of these micropollutants can be sufficiently removed by the application of heterogeneous catalytic ozonation, using calcite as the catalyst, except for the case of atrazine, which was the compound that was most difficult to degrade, when compared to the application of single ozonation. Carbamazepine with kO3 = 3 × 105 M−1s−1 can be easily removed even by single ozonation after the first minute of the reaction time, and the addition of the catalyst eliminated the oxidation/reaction time. The application of catalytic ozonation resulted in 50% and 68.2% higher removals of benzotriazole and p-CBA, respectively, in comparison with single ozonation, even during the first 3 min of the reaction/oxidation time, due to the higher production of hydroxyl radicals, caused by the catalytic ozonation. For the case of atrazine, the addition of calcite did not enhance the micropollutant degradation, and its removal reached 83% after a 30 min application of catalytic ozonation, whereas during the single ozonation, the removal under the same reaction time was 90%.

scholarly journals Biodegradation of the Endocrine-Disrupting Chemical 17α-Ethynylestradiol (EE2) by Rhodococcus zopfii and Pseudomonas putida Encapsulated in Small Bioreactor Platform (SBP) Capsules

2020 ◽  
Vol 10 (1) ◽  
pp. 336 ◽  
Author(s):  
Ofir Menashe ◽  
Yasmin Raizner ◽  
Martin Esteban Kuc ◽  
Vered Cohen-Yaniv ◽  
Aviv Kaplan ◽  
...  
Keyword(s):  
Pseudomonas Putida ◽  
Minimal Medium ◽  
Carbon Sources ◽  
Endocrine Disrupting Chemical ◽  
Treatment Processes ◽  
Endocrine Disrupting ◽  
Steroidal Hormones ◽  
Secondary Effluents ◽  
Encapsulation Method ◽  
Pseudomonas Putida F1

In this study, we present an innovative new bio-treatment approach for 17α-ethynyestradiol (EE2). Our solution for EE2 decontamination was accomplished by using the SBP (Small Bioreactor Platform) macro-encapsulation method for the encapsulation of two bacterial cultures, Rhodococcus zopfii (R. zopfii ) and Pseudomonas putida F1 (P. putida). Our results show that the encapsulated R. zopffi presented better biodegradation capabilities than P. putida F1. After 24 h of incubation on minimal medium supplemented with EE2 as a sole carbon source, EE2 biodegradation efficacy was 73.8% and 86.5% in the presence of encapsulated P. putida and R. zopfii, respectively. In the presence of additional carbon sources, EE2 biodegradation efficacy was 75% and 56.1% by R. zopfii and P. putida, respectively, indicating that the presence of other viable carbon sources might slightly reduce the EE2 biodegradation efficiency. Nevertheless, in domestic secondary effluents, EE2 biodegradation efficacy was similar to the minimal medium, indicating good adaptation of the encapsulated cultures to sanitary effluents and lack of a significant effect of the presence of other viable carbon sources on the EE2 biodegradation by the two encapsulated cultures. Our findings demonstrate that SBP-encapsulated R. zopfii and P. putida might present a practical treatment for steroidal hormones removal in wastewater treatment processes.

scholarly journals ESTUDIO DE LA DECOLORACIÓN DEL COLORANTE SUNFIX YELLOW S4GL EMPLEANDO EL PROCESO DE OXIDACIÓN AVANZADA H2O2/UV

2018 ◽  
Vol 27 (1) ◽  
pp. 67
Author(s):  
Aldeir Pinedo ◽  
Fernando Anaya
Keyword(s):  
Hydrogen Peroxide ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Reactive Dye ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Uv C

Se ha realizado el estudio cinético de la decoloración del colorante reactivo Sunfix Yellow S4GL (RAS) empleando una disolución de 20 ppm del colorante mediante el proceso de oxidación avanzada (POA) H2O2/UV. Para ello se evaluó el efecto de la concentración inicial del peróxido de hidrógeno, el pH inicial de la solución, la concentración del colorante y la intensidad de la radiación UV‐C sobre la decoloración con el fin de optimizarlos. Los valores óptimos son los siguientes: concentración inicial de H2O2 a 3.8 x 10‐2 mol/L, pH3, concentración inicial del colorante a 20mg/L, potencia de radiación 3 lámparas con potencia de 15W de radiación UV‐C cada una. El estudio cinético de la decoloración sigue un modelo cinético de pseudo primer orden. Bajo condiciones óptimas se obtuvo un porcentaje de decoloración del 100% luego de una hora de tratamiento. Palabras clave.- decoloración, proceso de oxidación avanzada (POA), peróxido de hidrógeno, radiación UV‐C em> ABSTRACT A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration. Keywords.- discoloration, advanced oxidation process (AOP), hydrogen peroxide, UV‐C radiation.

scholarly journals Degradation of Blue KN-R Dye in Batik Effluent by an Advanced Oxidation Process Using a Combination of Ozonation and Hydrodynamic Cavitation

2019 ◽  
Vol 19 (1) ◽  
pp. 41
Author(s):  
Eva Fathul Karamah ◽  
Pristi Amalia Nurcahyani
Keyword(s):  
Textile Industry ◽  
Advanced Oxidation Process ◽  
Hydrodynamic Cavitation ◽  
Chemical Effect ◽  
Optimum Conditions ◽  
Toc Removal ◽  
Initial Ph ◽  
World Cultural Heritage ◽  
Single Method ◽  
Ozonation Process

The popularity of batik has been increasing since it was declared as a world cultural heritage by UNESCO in 2009. Correspondingly, the content of textile dyes in textile industry wastewater is also increased. These dyes contain functional groups which make them quite stable in the environment and causes pollution. In this work, degradation of 100 ppm Blue KN-R has been investigated using ozonation, hydrodynamic cavitation, and a combination of the two for 60 min. The three configuration methods were optimized in terms of different operating parameters, namely flowrate, initial pH and dosage of ozone, to obtain the maximum degradation of Blue KN-R. It was found that the highest decolorization level for a single method was 70.16% for the single ozonation process at pH 11 and 156.48 mg/h of ozone and 1.79% for the single hydrodynamic cavitation process at pH 4. The highest decolorization level was 79.39%, achieved by the combination at pH 11 and 156.48 mg/h of ozone. The mineralization level in the form of a percentage of Total Organic Carbon (TOC) removal by ozonation, hydrodynamic cavitation, and their combination was 14.81, 1.85, and 19.9%, respectively. Due to its better performance, degradation of Blue KN-R was conducted by the hybrid method for 120 min, resulting in 92.63% of decolorization and 24.54% of TOC removal. The degree of synergetic decolorization and mineralization was due to the mechanical and chemical effect of hydrodynamic cavitation in increasing ozone solubility and production of hydroxyl radicals. Degradation of batik effluent has been investigated in optimum conditions for 120 min. The color, COD, BOD, and TSS removal were 67.96, 68.72, 66.54, and 79.84%, respectively.

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