Electrochemical disinfection of bacterial contamination: Effectiveness and modeling study of E. coli inactivation by electro-Fenton, electro-peroxi-coagulation and electrocoagulation

Kourdali, Sidali; Badis, Abdelmalek; Boucherit, Ahmed; Boudjéma, Karim; Saiba, Ali

doi:10.1016/j.jenvman.2018.08.038

Cited by 38 publications

(16 citation statements)

References 36 publications

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“…Types of waste or other contaminants that have been reported set aside by electro-Fenton include industrial waste with processing conditions using iron plate electrodes which are added H2O2 from outside with a concentration of 0-16 mM, current 0.25-1,5 mA/cm 2 , with a pH of 2.7, from the experimental results obtained the optimal EF condition is to add 12 mM H2O2, pH 2.7, current of 1 mA/cm 2 with a processing time of 80 minutes, obtained the COD allowance was 76.3% [13]. E. Coli bacteria can be deactivated by the EF process, this study was conducted using a batch reactor, the current used was 0.5 mA using Pt anode, stainless steel cathode, and the distance between electrodes was 4 cm [23]. Electro-Fenton process is also used to remove surfactants using carbon cathodes and cylindrical stem anodes with an electrode distance of 1.6 cm, H2O2 resulting from O2 reduction produced from injection from the outside at a rate of 1L/minute for 10 minutes before electrolysis begins, and stirring is carried out at a speed of 700 rpm, the results of this experiment are surfactant sodium dodecyl benzene sulfonate (LAS) capable of being eliminated in the presence of OH radicals, with a stress condition of 200 mA, catalyst Fe 2+ 0.3 mM and pH 3 during 180 minutes which 50 mg/L LAS is able to be completely eliminated [21].…”

Section: Othermentioning

confidence: 90%

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Electro-Fenton for Industrial Wastewater Treatment: A Review

Marlina

Purwanto

2019

E3S Web Conf.

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Electro-Fenton is part of electrochemical advanced oxidation processes (EAOPs) which have been widely used to treat various types of waste such as color, drugs, phenol compounds, leachate, surfactants, and others. This article focuses on the effects of various operating parameters and recent developments in the electro-Fenton process, and then their optimum ranges for maximum pollutant removal and various pollutants removed by this process is observed.

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Section: Othermentioning

confidence: 90%

“…The suitability of the number of iron ion concentrations in the EF process is an important requirement [23]. In general, the efficiency of EF process is affected by increasing the concentration of Fe 2+ because as an agent of oxidizing in EF Fe 2+ had a big effect to reduce big molecule in wastewater such as dyes in dyeing wastewater [5].…”

Section: Fe 2+mentioning

confidence: 99%

Electro-Fenton for Industrial Wastewater Treatment: A Review

Marlina

Purwanto

2019

E3S Web Conf.

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“…As the reaction time increased, the concentration of ARG gradually decreased, while the concentration of intermediate products and side reaction products increased. These side reactions and intermediates caused a gradual decrease in the rate of global reaction [20].…”

Section: Degradation Of Arg By Ef-feox Process and Comparison With Otmentioning

confidence: 99%

“…This phenomenon is due to the consumption of •OH by SO4 2-(SO 4 2− +• OH + H + = SO 4 •− + H 2 O) [36]. The increase of the salt content will also increase the viscosity and density of the solution, inhibit the mass transfer process in the solution [20], so that the dye molecules cannot fully contact with the •OH, which inhibited the removal of dye. In summary, the optimum concentration of Na2SO4 is 0.2 mM.…”

Section: Effect Of Initial Concentrationmentioning

confidence: 99%

Process optimization and mechanism study of acid red G degradation by electro-Fenton- Feox process as an in situ generation of H2O2

Sun¹,

Yao²,

Wei³

et al. 2021

Turk J Chem

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Dye contaminated wastewaters are industrial wastewaters that are difficult to be treated using traditional biochemical and physicochemical methods. In the present work, the acid red G was removed as a model pollutant by the Electro-Fenton Process for the first time. The anode and cathode used by the Electro-Fenton Process were iron plate and graphite felt, respectively. Optimizing the process, it was concluded that under the conditions of current density= 20 mA cm-2 , pH= 3 and initial Na2SO4 concentration= 0.2 M, the removal rate of acid red G with an initial concentration of 300 mg L-1 could reach 94.05% after 80 min of electrolysis. This reveals that the EF-Feox Process used in this work has an excellent removal efficiency on acid red G. The required reagents (Fe 2+ , H2O2) were generated by the electrode reaction, while the optimal generation conditions and mechanism of •OH, H2O2 and Fe 2+ were investigated. By testing •OH, H2O2, and Fe 2+ agents at different pH and current densities, it was revealed that the Electro-Fenton reaction was most efficient when the current density was 20 mA cm-2, and the pH was 3. Moreover, the removal rate of ARG is consistent with first-order reaction kinetics.

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“…Factors such as the type and concentration of the organism, the type, concentration, application time and usage of the disinfectant, physical and chemical properties of the water (temperature, suspended solids, organic material's concentration, pH, etc.) are all influential in the electrochemical disinfection process [16,[18][19][20]. For a fixed disinfectant concentration, the amount of killed bacteria is expected to be directly related to the contact time during electrolysis [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrode Type on Bacteria Removal and Chlorine and Radical Production in Electrochemical Water Disinfection

Gerek¹,

Koparal²,

Koparal³

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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ÖzSu kaynaklarında tehlikeli bakteri ve virüs üremesi önemli bir problem olmaya devam etmektedir. Bu kirlenmenin başlıca nedeni, su kaynaklarından önemli bir kısmını oluşturan yeraltı suyunun şehir ve endüstri atıklarından bulaşmaya açık olmasıdır. Bu çalışmada bu tarz suların dezenfeksiyonu için elektrokimyasal arıtım ele alınmaktadır. Literatürde tek tek ele alınmış pek çok elektrokimyasal arıtım çalışması mevcuttur. Bu çalışmada bor kaplı elmas elektrot, iridyum metal-oksit elektrot ve grafit plaka elektrotları ele alınmaktadır. Pek çok elektrokimyasal parametre seviyesinde bakteri ölümleri izlenirken bir yandan da klor ve diğer toksik radikal oluşumları izlenmiştir. Deneyler, gerçek yeraltı suyuna kontrollü şekilde eklenmiş E.coli kültürü ile yapılmıştır. Reaksiyon sırasında mikroorganizmalar hem doğrudan elektriksel ve fiziksel nedenlerle, hem de oluşan radikaller nedeniyle ölmektedir. Dolayısıyla arıtım esnasında bakterilerin eliminasyonu ile zehirli çıktı oluşturma arasında hassas bir denge mevcuttur. Bu süreçte mikroorganizmaların biyolojik yapısı ya da yer altı suyunun kimyasal kompozisyonu kontrol edilemeyeceğine göre araştırma parametresi olarak elektrot tipinin değiştirilmesi ve elektrik seviyesinin ayarlanması mantıklı bir yaklaşımdır. Deneysel olarak görülmektedir ki hem sürekli akış, hem de kesikli arıtım sistemlerinde bor kaplamalı elektrotlar, denenenler arasında en ideal seçim olmaktadır, zira dezenfeksiyon seviyelerini iridyum metal-oksit elektrot seçimi kadar yüksek seviyede yapabilirken bir yandan da grafit plaka elektrotlar kadar az miktarda radikal üretmektedir.

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Electrochemical disinfection of bacterial contamination: Effectiveness and modeling study of E. coli inactivation by electro-Fenton, electro-peroxi-coagulation and electrocoagulation

Cited by 38 publications

References 36 publications

Electro-Fenton for Industrial Wastewater Treatment: A Review

Electro-Fenton for Industrial Wastewater Treatment: A Review

Process optimization and mechanism study of acid red G degradation by electro-Fenton- Feox process as an in situ generation of H2O2

Effect of Electrode Type on Bacteria Removal and Chlorine and Radical Production in Electrochemical Water Disinfection

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