Fenton Articles
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Advanced treatment of petrochemical secondary effluent by Fenton: performance and organics removal characteristics
The Fenton process was used to treat petrochemical secondary effluent. The effects of initial pH, H2O2, and FeSO4·7H2O dosages on chemical oxygen demand (COD) removal, the dissolved organic matter (DOM) removal and the transformation and migration of typical organic matters during the treatment process were investigated. The results showed that the optimum conditions were initial pH of 3.0, ...
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Treatment of hexavalent chromium by using a combined Fenton and chemical precipitation process
This work aimed to remove hexavalent chromium and three treatment schemes were examined based on a laboratory scale design: (a) Fenton process, (b) precipitation process, and (c) Fenton process followed by precipitation process. Variations of this study including pH, Fenton and precipitation reagents (molar ratio of Fe2+/H2O2 and FeCl3), contact time, and initial concentration of ...
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Study on mechanism of algal inactivation and pollution removal by Fe-ACF electro Fenton-like process
Algae inactivation and algal metabolic pollutant removal of Chlorella and Duneliella salina from seawater by the Fe-ACF electro Fenton-like process has been studied. The experiments were conducted at neutral condition of pH 8.3 (raw water) and 6.2 to break through the limit of strong acidic conditions. Experimental results indicated that the Fe-ACF electro Fenton-like process has a good ...
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Treatment of oilfield wastewater by combined process of micro-electrolysis, Fenton oxidation and coagulation
In this study, a combined process was developed that included micro-electrolysis, Fenton oxidation and coagulation to treat oilfield fracturing wastewater. Micro-electrolysis and Fenton oxidation were applied to reduce chemical oxygen demand (COD) organic load and to enhance organic components gradability, respectively. Orthogonal experiment were employed to investigate the influence factors ...
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A new strategy for treating a cotton dyeing wastewater – integration of physical-chemical and advanced oxidation processes
New strategies were herein applied for treating a cotton dyeing wastewater: coagulation/flocculation followed by Fenton’s oxidation – approach 1, Fenton process per se – approach 2, and Fenton followed by coagulation/flocculation – approach 3, aiming reducing chemicals consumption. Regarding the cost analysis, which is crucial for deciding on the best strategy to implement, it was found that ...
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Pre–treatment of refinery spent caustic by Fenton's reaction
Experimental results for applying Fenton oxidation as a pre–treatment method for spent caustic are presented. A combination of dilution and Fenton's reaction is proposed as a method for reduction of total COD and total phenols in spent caustics. This approach was used to obtain a decrease in total phenols from 5,200 mg/L to less than 130 mg/L. The greatest removal occurred within a pH range of ...
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Physico-chemical treatment for the depuration of wine distillery wastewaters (vinasses)
ABSTRACTIn the present work, an integrated Fenton-coagulation/flocculation process was applied for the depuration of wine distillery wastewaters, commonly known as 'vinasses'. This study evaluates the Fenton process (H2O2/Fe2+), involving oxidation – in a first stage and coagulation/flocculation (using Ca(OH)2 as base-precipitant) – in a second stage for the removal of chemical oxygen demand ...
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Comparative analysis of extended aeration and Fenton process in landfill leachate treatment
This research is undertaken to investigate various operating conditions for minimising sludge disposal and maximising chemical oxygen demand from leachate. With conventional extended aeration process the optimum removal of COD and colour were 36% and 24% respectively. In Fenton process, for optimum pH of 5 and optimum H2O2/Fe2+ molar ratio of 1.3, the dosages of H2O2 and Fe2+ were found 1000 mg/l ...
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Effect of ferric chloride coagulation, lime precipitation, electrocoagulation and the Fenton's reagent on the particle size distribution of olive mill wastewater
Size fractionation of olive mill wastewater (COD:155000 mg/L; TOC:40000 mg/L; BOD5:37700 mg/L; total phenols:4100 mg/L; absorbance at 395 nm:145 cm−1) before and after FeCl3 coagulation, Ca(OH)2 precipitation, electrocoagulation and the Fenton process was investigated. Particulate organic compounds were the major components of COD (54%), TOC (43%), BOD5 (43%), absorbance (57%), followed by an ...
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Optimization of Fenton's reagent coupled to Dissolved Air Flotation to remove cyanobacterial odorous metabolites and suspended solids from raw surface water
Ferrous salts are commonly used as coagulants in Water Treatment Plants (WTPs). When these salts are combined with hydrogen peroxide in acidic conditions – besides coagulation – an additional Advanced Oxidation Process (Fenton's reagent) can take place. Using a response surface methodology, this paper presents the optimization of a novel treatment system constituted by Fenton's reagent (FE) and ...
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The combination of coagulation, acid cracking and Fenton-like processes for olive oil mill wastewater treatment: phytotoxicity reduction and biodegradability augmentation
Olive oil mill wastewater (OOMW) is one of the most important industrial wastewaters in the world due to high organic load and phenolic compounds. In this study, an integration of three processes including coagulation, acid cracking and Fenton-like was evaluated to treat OOMW. The performance of alum, ferric chloride and polyaluminum chloride was studied as coagulants. Among coagulants, ferric ...
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Applicability of an electrochemical Fenton-type process to actual wastewater treatment
The applicability of an electrochemical Fenton-type process (EF-HOCl-ReFe) to the treatment of three actual wastewaters, namely wastewater from an automobile factory (automobile wastewater), metal scrap-cleansing wastewater, and municipal wastewater, is discussed in this research. The EF-HOCl-ReFe successfully removed the chemical oxygen demand (COD) from automobile wastewater pre-treated by ...
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Treatment of oil–water emulsion from the machinery industry by Fenton's reagent
An oil–water emulsion from the machinery industry was treated using Fenton's reagent. The objective was to reduce the high chemical oxygen demand (COD) of this waste stream so that it would meet the COD effluent limit of Chinese Standard JS-7740-95. The optimal [H2O2]/[Fe2+] ratio for COD removal was 3. An orthogonal experimental design was developed based on the optimal ...
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Assessment of the best available wastewater management techniques for a textile mill: cost and benefit analysis
In the present study, several water recovery and end-of-pipe wastewater treatment alternatives were evaluated towards the evaluation of Best Available Techniques (BATs) for the management of wastewaters from a denim textile mill in accordance with the European Union's Integrated Pollution Prevention and Control (IPPC) Directive. For this purpose, an assessment that translates the key ...
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Simultaneous use of iron and copper anodes in photoelectro-Fenton process: concurrent removals of dye and cadmium
Photoelectro-Fenton (PEF) was carried out for concurrent removals of inorganic and organic pollutants with simultaneous applications of two different anodes (iron and copper). Cadmium and Direct Orange 26 (DO26) were selected as samples of the contaminants of textile wastewater and influential parameters (pH, current density, H2O2 dosage and electrolysis time) of PEF were evaluated on Cd and ...
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Combined treatment of hydroxypropyl guar gum in oilfield fracturing wastewater by coagulation and the UV/H2O2/ferrioxalate complexes process
Hydroxypropyl guar gum is considered to be a main component of oilfield fracturing wastewater (OFW). This work is intended to optimize the experimental conditions for the maximum oxidative degradation of hydroxypropyl guar gum by the coagulation and UV/H2O2/ferrioxalate complexes process. Optimal reaction conditions were proposed based on the chemical oxygen demand (COD) removal efficiency ...
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Combined treatment of organic material in oilfield fracturing wastewater by coagulation and UV/H2O2/ferrioxalate complexes process
Organic material is considered to be a main component of oilfield fracturing wastewater (OFW). This work is intended to optimize the experimental conditions for the maximum oxidative degradation of organic material by coagulation and the UV/H2O2/ferrioxalate complexes process. Optimal reaction conditions are proposed based on the chemical oxygen demand (COD) removal efficiency. The overall ...
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Sequential treatment of an old-landfill leachate
This work investigates the performance of combined techniques applied to the treatment of an old-landfill leachate, which presents high salinity, low biodegradability (BOD5/COD around 0.05) and high ammonia concentration. Three sequences of processes were employed, including coagulation/flocculation, chemical oxidation, biological treatment and ammonia stripping. The association of ...
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