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.

Degradation of Organic Micropollutants in UV/NH2Cl Advanced Oxidation Process

2019 ◽  
Vol 53 (15) ◽  
pp. 9024-9033 ◽  
Author(s):  
Peizhe Sun ◽  
Tan Meng ◽  
Zijian Wang ◽  
Ruochun Zhang ◽  
Hong Yao ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Organic Micropollutants

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.

scholarly journals Start-Up of a Biofilter in a Full-Scale Groundwater Treatment Plant for Iron and Manganese Removal

2019 ◽  
Vol 16 (5) ◽  
pp. 698 ◽  
Author(s):  
Huiping Zeng ◽  
Can Yin ◽  
Jie Zhang ◽  
Dong Li
Keyword(s):  
Treatment Plant ◽  
Groundwater Treatment ◽  
Manganese Removal ◽  
Biological Filter ◽  
Start Up ◽  
Suspension Process ◽  
Intermittent Operation ◽  
Removal Processes ◽  
Filter Layer ◽  
Iron And Manganese

In recent years, biological purification technology has been widely developed in the process of iron and manganese removal from groundwater. The cultivation and maturation of the biological filter layer are key for biological iron and manganese removal processes. The time needed for maturation varies significantly with the water quality, filter and filter media conditions and operation parameters; sometimes it takes only one or two months, sometime more than half a year. In this paper, the feasibility of adopting an intermittent operation for the cultivation of biofilter was investigated with productive filters in a groundwater treatment plant, and the comparative test of the filter column was conducted. The results showed that the intermittent operation had little effect on the cultivation of the biofilter because dissolved oxygen would be gradually exhausted during the filter-suspension process, making the filter layer anaerobic, thus possibly inhibiting the growth and reproduction of IMOB (Iron and Manganese Oxidizing Bacteria). At the same time, the test shows that when the mature biological filter needs the suspension operation, the emptying method should be considered to avoid the destruction of the biological layer.

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 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 %. 

Iron and Manganese Removal from Groundwater Using High Quality Limestone

2015 ◽  
Vol 802 ◽  
pp. 460-465 ◽  
Author(s):  
Nor Azliza Akbar ◽  
Hamidi Abdul Aziz ◽  
Mohd Nordin Adlan
Keyword(s):  
Langmuir Isotherm ◽  
Metal Removal ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Groundwater Sample ◽  
Groundwater Treatment ◽  
Mineral Contents ◽  
Manganese Removal ◽  
Batch Study ◽  
Iron And Manganese

Several techniques are used for iron and manganese removal from groundwater. Among these treatments, adsorption has been proven to be a very effective in metal removal for groundwater treatment. Thus, limestone has been proposed as adsorption media because of its low cost. In this study, the mineral contents of limestone were detected using X-ray fluorescence (XRF). XRF results showed that limestone contains 97.93% CaCO3, 0.87% MgO, and 1.2% other elements. Groundwater sample was obtained from USM borehole located at 5° 08’ 50.5”N and 100° 29’ 34.7”E. A batch study was carried out for various dosages of limestone media (5–50 g) in 200 mL of groundwater sample. The highest iron and manganese removal was more than 90% and 70%, respectively, at optimum dosage of 40 g/200 mL sample. Adsorption data were modeled using Langmuir and Freundlich adsorption isotherms. The batch study result shows that monolayer Langmuir isotherm fitted the experimental data better than the Freundlich isotherm. The correlation coefficient (R2) in the Langmuir isotherm for both metals were 0.84 and 0.97, whereas 0.83 and 0.23 in the Freundlich isotherm, respectively. Based on the present results, application of limestone as adsorbent media can be a good alternative of groundwater treatment because of the low cost of the media. Thus, the use of limestone could help to overcome the excessive iron and manganese problem in water treatment plants.

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.

Photo-degradation of monoazo dye blue 13 using advanced oxidation process

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Aqueous Solution ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
High Energy ◽  
Uv Exposure ◽  
H2o2 Concentration ◽  
Oxidizing Agent ◽  
Photo Degradation ◽  
High Energy Radiation ◽  
Uv Lamp

The high energy radiation overcome the bonding of solute in a solution and H2O2 acts as an oxidizing agent and generates a free radical in the solution which results in photo-degradation by converting the solute in to simple form and resultantly, colored substance under the effect of photo-degradation becomes colorless. The photo-degradation of monoazo dye Blue 13 in an aqueous solution was investigated using a laboratory scale UV lamp in the presence of H2O2 and for maximum degradation of dye, the independent parameter UV power, UV exposure time, pH and H2O2 concentration were optimized. It was found that neither UV in the presence of H2O2 is able to degrade Blue 13 under optimum condition. The results revealed that the use of both UV and H2O2 have pronounced effect on the discoloration of dyes which could be used for management of textile effluents contain waste dyes.

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