scholarly journals Inactivation of Ascaris eggs in water using sequential solar driven photo-Fenton and free chlorine

2011 ◽  
Vol 10 (1) ◽  
pp. 20-30 ◽  
Author(s):  
Erick R. Bandala ◽  
Liliana González ◽  
Jose Luis Sanchez-Salas ◽  
Jordana H. Castillo
Keyword(s):  
Fenton Reaction ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Free Chlorine ◽  
Process Efficiency ◽  
Time Process ◽  
Fenton Process ◽  
Solar Disinfection ◽  
Helminth Eggs ◽  
Sequential Processes

Sequential helminth egg inactivation using a solar driven advanced oxidation process (AOP) followed by chlorine was achieved. The photo-assisted Fenton process was tested alone under different H2O2 and/or Fe(II) concentrations to assess its ability to inactivate Ascaris suum eggs. The effect of free chlorine alone was also tested. The lowest egg inactivation results were found using Fe(II) or H2O2 separately (5 and 140 mmol L−1, respectively) in dark conditions, which showed about 28% inactivation of helminth eggs. By combining Fe(II) and H2O2 at the same concentrations described earlier, 55% of helminth egg inactivation was achieved. By increasing the reagent's concentration two-fold, 83% egg inactivation was achieved after 120 min of reaction time. Process efficiency was enhanced by solar excitation. Using solar disinfection only, the A. suum eggs inactivation reached was the lowest observed (58% egg inactivation after 120 min (120 kJ L−1)), compared with tests using the photo-Fenton process. The use of the photo-Fenton reaction enhanced the process up to over 99% of egg inactivation after 120 kJ L−1 when the highest Fe(II) and H2O2 concentration was tested. Practically no effect on the helminth eggs was observed with free chlorine alone after 550 mg min L−1 was used. Egg inactivation in the range of 25–30% was obtained for sequential processes (AOP then chlorine) using about 150 mg min L−1.

Superiority of solar Fenton oxidation over TiO2 photocatalysis for the degradation of trimethoprim in secondary treated effluents

2013 ◽  
Vol 67 (6) ◽  
pp. 1260-1271 ◽  
Author(s):  
I. Michael ◽  
E. Hapeshi ◽  
C. Michael ◽  
D. Fatta-Kassinos
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Heterogeneous Photocatalysis ◽  
Solar Irradiation ◽  
Fenton Process ◽  
Iron Salt ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Initial Substrate ◽  
Initial Substrate Concentration

The overall aim of this work was to examine the degradation of trimethoprim (TMP), which is an antibacterial agent, during the application of two advanced oxidation process (AOP) systems in secondary treated domestic effluents. The homogeneous solar Fenton process (hv/Fe2+/H2O2) and heterogeneous photocatalysis with titanium dioxide (TiO2) suspensions were tested. It was found that the degradation of TMP depends on several parameters such as the amount of iron salt and H2O2, concentration of TiO2, pH of solution, solar irradiation, temperature and initial substrate concentration. The optimum dosages of Fe2+ and H2O2 for homogeneous ([Fe2+] = 5 mg L−1, [H2O2] = 3.062 mmol L−1) and TiO2 ([TiO2] = 3 g L−1) for heterogeneous photocatalysis were established. The study indicated that the degradation of TMP during the solar Fenton process is described by a pseudo-first-order reaction and the substrate degradation during the heterogeneous photocatalysis by the Langmuir–Hinshelwood kinetics. The toxicity of the treated samples was evaluated using a Daphnia magna bioassay and was finally decreased by both processes. The results indicated that solar Fenton is more effective than the solar TiO2 process, yielding complete degradation of the examined substrate within 30 min of illumination and dissolved organic carbon (DOC) reduction of about 44% whereas the respective values for the TiO2 process were ∼70% degradation of TMP within 120 min of treatment and 13% DOC removal.

Fenton process for the combined removal of iron and organic micropollutants in groundwater treatment

2002 ◽  
Vol 2 (2) ◽  
pp. 229-236 ◽  
Author(s):  
G.F. Ijpelaar ◽  
M. Groenendijk ◽  
J.C. Kruithof ◽  
J.C. Schippers
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Laboratory Scale ◽  
Fenton Process ◽  
Organic Micropollutants ◽  
Groundwater Treatment ◽  
Manganese Removal ◽  
Nitrification Process ◽  
High Concentrations ◽  
Iron And Manganese

Fenton process, known as Advanced Oxidation Process for the degradation of organic pollutants in waste and drinking water, was studied for the combination of iron removal and pesticide control in anaerobic groundwater. The combined effect of aeration and rapid sand filtration, which are commonly applied in groundwater treatment, was studied in a pilot plant. Pesticide degradation was performed on laboratory scale. It was found that addition of 2 mg/L H2O2 prior to aeration improved the removal of iron without hindering the filtration processes of manganese removal and nitrification. Under these conditions, the laboratory-scale tests showed pesticide degradations of up to 80% (influent concentration 1.6-2.5 μg/L). Dosing 8.5 mg/L H2O2 all selected pesticides were converted more than 80%. However, this dose appeared to have an adverse effect on the removal of iron and manganese and the nitrification process. This is attributed to the presence of relatively high concentrations H2O2 in the water entering the rapid sand filter. By filtration AOC, formed during oxidation with the low H2O2 dose, was reduced from about 70 μg/L to about 15-20 μg Acetate-C/L. Bromate formation did not occur. Residual H2O2 varied from 0.1-0.2 mg/L (2 mg/L H2O2 dose) to 0.2-0.4 mg/L (8.5 mg/L H2O2 dose) which is higher than the proposed guideline of 0.019 mg/L.

scholarly journals Solar-driven free chlorine advanced oxidation process for simultaneous removal of microcontaminants and microorganisms in natural water at pilot-scale

Chemosphere ◽  
2021 ◽  
pp. 132493
Author(s):  
Isaac Sánchez-Montes ◽  
Irene Salmerón ◽  
José M. Aquino ◽  
María Inmaculada Polo-López ◽  
Sixto Malato ◽  
...  
Keyword(s):  
Natural Water ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Pilot Scale ◽  
Free Chlorine ◽  
Simultaneous Removal

Emerging investigators series: ultraviolet and free chlorine aqueous-phase advanced oxidation process: kinetic simulations and experimental validation

2018 ◽  
Vol 4 (9) ◽  
pp. 1231-1238 ◽  
Author(s):  
Divya Kamath ◽  
Daisuke Minakata
Keyword(s):  
Kinetic Model ◽  
Aqueous Phase ◽  
Experimental Validation ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Free Chlorine ◽  
Elementary Reaction ◽  
Process Kinetic

An elementary reaction based kinetic model was developed for the fate of acetone degradation in UV/free chlorine advanced oxidation process.

Remediation of Water Contaminated with Pesticides by Indirect Electrochemical Oxidation Process Electro-Fenton

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Aida Kesraoui Abdessalem ◽  
Nihal Oturan ◽  
Nizar Bellakhal ◽  
Mohamed Dachraoui ◽  
Mehmet A. Oturan
Keyword(s):  
Aqueous Solutions ◽  
Hydroxyl Radical ◽  
Electrochemical Oxidation ◽  
Acidic Medium ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Fenton Process ◽  
Carbon Felt ◽  
Platinum Anode

AbstractThe mineralization of pesticides chlortoluron, carbofuran and bentazone aqueous solutions in acidic medium of pH 3 was studied by electro-Fenton process using a carbon felt cathode and a platinum anode. This advanced oxidation process allows the formation of hydroxyl radical (

scholarly journals Application of the Fenton process in the elimination of helminth eggs

2014 ◽  
Vol 12 (4) ◽  
pp. 722-726 ◽  
Author(s):  
Sandra Isabel Escobar-Megchún ◽  
Hugo Alejandro Nájera-Aguilar ◽  
Magaly González-Hilerio ◽  
Javier Gutiérrez-Jiménez ◽  
Rubén Fernando Gutiérrez-Hernández ◽  
...  
Keyword(s):  
Ascaris Lumbricoides ◽  
Ferrous Sulfate ◽  
Fenton Reaction ◽  
Health Hazard ◽  
Molar Ratio ◽  
Fenton Process ◽  
Molar Ratios ◽  
Ph Values ◽  
Helminth Eggs ◽  
Human Health Hazard

This study relates to a method for evaluating the degradation efficiency of Ascaris lumbricoides eggs through a Fenton reaction, using hydrogen peroxide (H2O2) at 100, 250, and 500 mg/L, ferrous sulfate (FeSO4) at 458 mg/L Fe2+ and pH values of 3, 4.5, and 6. The experiments were conducted according to a 32 experimental design, with 1:1, 3:1, and 5:1 (H2O2/Fe2+) molar ratios. The oxidation and flocculation stages were performed at 130 rpm during 2 hours and at 25–30 rpm during 20 min, respectively. As a result of the Fenton reaction, an average of 91.2% Ascaris lumbricoides egg degradation was achieved at pH 6 using a 500 mg/L dose of H2O2 and a 3:1 (H2O2/Fe2+) molar ratio. Thus, this process is an alternative for eliminating parasites that are resistant to conventional disinfection processes and significantly reduces the human health hazard they represent.

scholarly journals OPTIMIZATION OF SIMAFIX RED DYE DECOLORIZATION BY USING ADVANCED OXIDATION PROCESS: PHOTO-FENTON

2018 ◽  
Vol 54 (4B) ◽  
pp. 64
Author(s):  
Nga Thi Dinh
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ph Value ◽  
Batch Reactor ◽  
Textile Wastewater ◽  
Dye Decolorization ◽  
Fenton Process ◽  
Removal Efficiencies ◽  
Textile Wastewater Treatment ◽  
Red Dye

This study investigated the Photo-Fenton process in textile wastewater treatment by using textile synthesis wastewater made of Symafix Red Dye solution. The aim of the study was to investegate the factors that influent to the photo-Fenton process such as contact time, pH, H2O2 and Fe2+conectrations, and UVexposure in order to research the optimum values of this process.Treatment of textile wastewater was carried out at ambient temperature in a batch reactor. As a result, the second-order is suitable for the reaction of removing color by using Photo –Fenton processes. The removal efficiencies decreased when we increased the concentration of Fe2+ from 7.162 mM to 14.162 mM. When we increased the H2O2 concentration from 0.037 mM to 0.11mM, the removal efficiencies slightly decreased. The optimum value of pH is pH = 3. At the optimum of pH value and minimum the concentration of Fe2+ and H2O2 the removal efficiency could reach up to 95.82 %. 

scholarly journals STUDY ON THE FENTON REACTION FOR DEGRADATION OF REMAZOL RED B IN TEXTILE WASTE INDUSTRY

Molekul ◽  
2016 ◽  
Vol 11 (2) ◽  
pp. 168 ◽  
Author(s):  
Henry Setiyanto
Keyword(s):  
Textile Industry ◽  
Fenton Reaction ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Environmental Water ◽  
Reactive Dye ◽  
Optimum Conditions ◽  
Second Order Reaction ◽  
Decolorization Efficiency ◽  
Remazol Red

Remazol Red B is a reactive dye that is often used in the textile industry. The dye can cause serious problems in the environmental / water because it is difficult to be degraded by microorganisms. Decolorization of reactive azo dyes (Remazol Red B) before being discharged into the environment is an important aspect in creating technology (method) that are environmentally friendly. The method chosen for this decolorization is Advanced Oxidation Process (AOP) using the Fenton reaction. The optimum conditions for this reaction is 25 mg/L H2O2 and 1.25 mg/L of Fe2+ to Remazol Red B with initial concentration at 83 mg/L ( with ratio [H2O2]/[Fe2+] = 20). The optimum conditions of this reaction were obtained at pH 3 and temperature of 27 0C, with decolorization efficiency up to 100% for a reaction time of 60 minutes. The kinetic model of dye decoloritation follow the second order reaction. Some of the metal ions were added i.e. Cu2+, Pb2+ and Zn2+ , given no significant impact on the degradation performed. 

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