Reusability of iron sludge as an iron source for the electrochemical Fenton-type process using Fe2+/HOCl system

Kishimoto, Naoyuki; Kitamura, Takashi; Kato, Masaaki; Otsu, Hideo

doi:10.1016/j.watres.2013.01.021

Cited by 103 publications

(25 citation statements)

References 30 publications

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“…As occurred in the synthetic wastewater, the measured iron concentration was 0.5 mg L −1 after the first minute and remained at that value for the duration of the reaction in the photo‐assisted Fenton and in the UV/PS/Fe system. In real applications, iron sludge could be separated through filtration and be reused in Fenton‐like reactions …”

Section: Resultsmentioning

confidence: 99%

Performance of different advanced oxidation processes for tertiary wastewater treatment to remove the pesticide acetamiprid

Carra

Pérez

Malato

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND This work studied the performance of different advanced oxidation processes (AOPs) as tertiary treatment for removal of the pesticide acetamiprid from water. Specifically, UV, UV/TiO2, UV/H2O2/Fe, and two systems with persulfate (PS), UV/PS and UV/PS/Fe, were evaluated. RESULTS The study was carried out in deionised water, synthetic water from a secondary effluent and real effluent from a conventional activated sludge effluent (CAS effluent). In addition, the effect of humic acids, lignin‐derivative and lauryl sulphate was investigated as organic matter that affects AOP efficiency. CONCLUSIONS Photo‐Fenton at natural pH proved to be the most efficient process in all matrices. The persulfate systems have also shown that they have great potential for micropollutant removal. It was found that humic acids reduced degradation efficiency for UV/H2O2/Fe and UV/PS/Fe due to competition with radicals. Humic acids had a negative impact on UV photolysis at high concentration due to the absorptivity of UV light. Lignin had a negative effect on AOPs that used iron, forming Fe(II)‐complexes with high absorptivity which act as a light filter. For lauryl sulphate, its chemical structure did not favour the formation of iron complexes at natural pH, resulting in similar degradation rates for UV/H2O2/Fe, UV/H2O2, UV/PS and UV/PS/Fe. © 2014 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Performance of different advanced oxidation processes for tertiary wastewater treatment to remove the pesticide acetamiprid

Carra

Pérez

Malato

et al. 2014

J of Chemical Tech & Biotech

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“…Although the amount of H2O2 produced by this method is less than the gas diffusion cathode method, this method costs less to operate, and its accumulated H2O2 concentration is higher compared to other methods, such as graphite electrodes, CNT, and carbon fiber cathode [45]. Pre-magnetized Fe 0 could improve the degradation of p-nitrophenol [40] A potential modification to reduce production cost has been investigated by Kishimoto et al [46] by reusing iron sludge for EF. This method was considered suitable for use with the batch separation model with Fe 2+ /HOCl as the Fenton-like reagents.…”

Section: Electro-fenton (Ef) Processmentioning

confidence: 99%

Fenton Reagent for Organic Compound Removal in Wastewater

et al. 2020

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The improper treatment of wastewater has cost humanity a large amount of access to clean water. Treating wastewater, by definition, means to remove pollutants, either physically or chemically. A chemical method of treating wastewater, the Fenton process, was deemed useful for the job. It includes a solution-based reaction that produces radicals to oxidize and break pollutants down. Variations of the Fenton process, each with their unique method, have been developed to increase the process’s efficacy and efficiency further. Admittedly, however, the information on this subject is relatively few, when compared to other more recent methods of treatment. This paper aims to present and discuss a wide variety of information on the Fenton process and its derivatives, including Electro-Fenton, Sono-Fenton, and Photo-Fenton among others.

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“…The other is a competition of cathodic reactions. Since Cu 0 deposition onto the cathode was observed, the two-electron reduction of Cu 2+ (equation (12)) was inferred to be predominant over the one-electron reduction of Cu 2+ (equation (9)). Accordingly, the promotion of equation (9) against equation (12) will be an important issue to enhance the η in the future.…”

Section: Effect Of Current Density On Electrochemical Fentontype Processmentioning

confidence: 99%

“…Although the electrochemical Fenton-type process can also reuse iron sludge as a Fe 2+ source [12], it requires an acidic condition for operation to avoid ferric hydroxide precipitation [13], which results in spending a large quantity of acid and alkali for the pH control. Accordingly, it is desired to establish an electrochemical AOP minimizing acid and alkali consumptions.…”

Section: Introductionmentioning

confidence: 99%

Technical Feasibility of Electrochemical Fenton-Type Process Using Cu(I)/HOCl System

Ito

Ukawa

Kishimoto

et al. 2018

J. of Wat. & Envir. Tech.

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Technical feasibilities of a Fenton-type reaction of cuprous ion (Cu + ) with hypochlorous acid (HOCl) and an electrochemical Fenton-type process using this reaction were discussed in this research. Since 1,4-dioxane was decomposed by mixing Cu + and HOCl, it was inferred that the reaction of Cu + + HOCl → Cu 2+ + ·OH + Cl − happened. As a result of electrolyzing 1,4-dioxane solution containing cupric ion (Cu 2+ ) and chloride ion (Cl − ), 1,4-dioxane was decomposed with the current efficiency (η) of 6.1%, which was higher than that for control experiments (1.7 − 1.8%). Therefore, it was confirmed that the electrochemical Fenton-type process with the cathodic reduction of Cu 2+ to Cu + and the anodic oxidation of Cl − to chlorine was feasible. The effect of current density on the electrochemical Fenton-type process was discussed by a series of experiments. Although 1,4-dioxane removal rate was enhanced with the increase in current density in the range of 2.5 − 10 mA/cm 2 , the η did not depend on current density clearly. Since deposition and precipitation of copper during electrolysis were thought to affect the η, it will be required to develop a technique avoiding the deposition and precipitation of copper in the future.

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Reusability of iron sludge as an iron source for the electrochemical Fenton-type process using Fe2+/HOCl system

Cited by 103 publications

References 30 publications

Performance of different advanced oxidation processes for tertiary wastewater treatment to remove the pesticide acetamiprid

Performance of different advanced oxidation processes for tertiary wastewater treatment to remove the pesticide acetamiprid

Fenton Reagent for Organic Compound Removal in Wastewater

Technical Feasibility of Electrochemical Fenton-Type Process Using Cu(I)/HOCl System

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