Investigation on the adverse impacts of electrochemically produced ClOx- on assessing the treatment performance of dimensionally stable anode (DSA) for Cl−-containing wastewater

Yan, Wei; Chen, Jinghua; Wu, Jingli; Li, Yifan; Liu, Yijie; Yang, Qin; Tang, Yizhen; Jiang, Bo

doi:10.1016/j.chemosphere.2022.136848

Cited by 9 publications

(3 citation statements)

References 44 publications

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“…Unfortunately, it has been reported that some oxychloride compounds (ClO x -) are formed during the application of this kind of electrochemical treatment systems of wastewater. They can be considered as interfering elements for COD determination and, similarly to the so-called "COD remover", they are responsible for the false COD reduction (Zhu et al 2022;Xiao et al 2023a,b;Yan et al 2023). In this mode, they would bring the wrong appearance about wastewater e uents meeting the COD discharge limit standard.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, depending on the wastewater itself, the overall chemical composition and the type of pollutant may vary (Sophonsiry and Morgenroth 2004). Most of the previously published studies regarding the negative interference of oxychlorides in COD determination, have been carried out by evaluating refractory organic matter in the form of benzene derived compounds such as benzohydroxamic acid (BHA) (Meng et al 2019), phenol (Xiao et al 2023b) and its degradation intermediate products (Zhu et al 2022;Yan et al 2023) such as benzoquinone, catechol and clorophenols. It is important to take into account that some of these compounds cannot be totally oxidised according to its relationship between experimental COD and theoretical oxygen demand (Baker et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of oxychlorides as chemical oxygen demand interferents: The roles of the different oxidizing agents and the organic carbon source of wastewaters

Gutiérrez-González,

Fernández-Mohedano,

Bejines

2024

Preprint

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Chemical oxygen demand (COD) is considered to be the most useful analytical parameter to characterize wastewaters in terms of water quality, by providing their organic matter or pollution content. For COD determination, a few interferences have been reported but some of them have not been estimated in detail in scientific literature. Hence constituting a critical issue for COD analysis in wastewater samples. In this research work, the negative interference of oxychlorides in COD measurements has been evaluated at laboratory scale. Specifically, the role of oxychlorides as alternative oxidizing agents in competition with dichromate has been assessed. The COD reduction performance varied widely according to the particular oxidizing agent used and its concentration, as well as, the organic carbon source and amount present in the wastewater. The experimental values of COD removal performance should be considered as dual concentration dependent. On the one hand, for each oxidizing agent the COD reduction performance is directly proportional to the dosage used in the experiment. On the other hand, the influence of OM concentration on COD removal performance was inversely proportional. In addition, chlorate can be considered as the strongest oxidizing agent and the principal interferent responsible for the over-evaluation of the COD removal performance. Furthermore, the interference extent of oxychlorides on COD determination decreased in the order of: Phthalate > Hydrocarbons > Proteins.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of oxychlorides as chemical oxygen demand interferents: The roles of the different oxidizing agents and the organic carbon source of wastewaters

Gutiérrez-González,

Fernández-Mohedano,

Bejines

2024

Preprint

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“…Although chloride ions have great potential in wastewater treatment by electrooxidation, the electrooxidation process also produces biotoxic derivatives (oxychlorides) with a high risk of affecting human health [11,12]. Thus, when performing indirect electrochemical oxidation, the experimental conditions should be carefully selected not only to maximize the removal of organic pollutants, but also to minimize the formation of potentially toxic chlorinated byproducts [3].…”

Section: Introductionmentioning

confidence: 99%

Electrogeneration of Hypochlorite Ions using a Dimensionally Stable Anode-Type (Ti/PtPd(10%)Ox) Electrode

Zayas,

Vega,

Soriano-Moro

et al. 2024

J. Electrochem. Sci. Technol

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The study examined the electrogeneration of hypochlorite ions (ClO−) via electrolysis of aqueous NaCl solutions using a dimensionally stable anode-type (DSA-type) electrode based on platinum and palladium oxides supported on titanium mesh (Ti/PtPd(10%)Ox). The electrogenerated ClO− was quantified on the basis of the absorption band at 292 nm (Aλ = 292) of the UV-Vis spectrum. The effect of initial pH, concentration of NaCl, cell potential difference and electrolysis time were investigated in this study. The results showed that the electrolysis of aqueous NaCl solutions increases the solution pH up to high values (≥ 8.0) that favor the formation of ClO− over chlorine or hypochlorous acid. The hypochlorite concentration increases significantly at pH values > 7.0 and shows a linear trend with increasing NaCl concentration and with increasing cell potential difference. When the cell potential and NaCl concentration are held constant, the maximum hypochlorite value during electrolysis depends on both the cell potential and NaCl concentration. The Ti/PtPd(10%)Ox anode favors the production of hypochlorite ions, making this anode a promising material for use in electrochemical oxidation of wastewater via an indirect mechanism.

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Assessment of hydrogen peroxide, persulfate, and peroxymonosulfate as oxidizing agents in electrochemical oxidation of pyridine

He,

Carrera,

Wang

et al. 2025

Chemical Engineering Journal

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Investigation on the adverse impacts of electrochemically produced ClOx- on assessing the treatment performance of dimensionally stable anode (DSA) for Cl−-containing wastewater

Cited by 9 publications

References 44 publications

Evaluation of oxychlorides as chemical oxygen demand interferents: The roles of the different oxidizing agents and the organic carbon source of wastewaters

Evaluation of oxychlorides as chemical oxygen demand interferents: The roles of the different oxidizing agents and the organic carbon source of wastewaters

Electrogeneration of Hypochlorite Ions using a Dimensionally Stable Anode-Type (Ti/PtPd(10%)Ox) Electrode

Assessment of hydrogen peroxide, persulfate, and peroxymonosulfate as oxidizing agents in electrochemical oxidation of pyridine

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