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Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes.
Environ Sci Pollut Res Int. 2014; 21(14):8573-84.ES

Abstract

Dairy wastewater is characterized by a high content of hardly biodegradable dissolved, colloidal, and suspended organic matter. This work firstly investigates the performance of two individual electrochemical treatments, namely electrocoagulation (EC) and electro-oxidation (EO), in order to finally assess the mineralization ability of a sequential EC/EO process. EC with an Al anode was employed as a primary pretreatment for the conditioning of 800 mL of wastewater. A complete reduction of turbidity, as well as 90 and 81% of chemical oxygen demand (COD) and total organic carbon (TOC) removal, respectively, were achieved after 120 min of EC at 9.09 mA cm(-2). For EO, two kinds of dimensionally stable anodes (DSA) electrodes (Ti/IrO₂-Ta₂O₅ and Ti/IrO₂-SnO₂-Sb₂O₅) were prepared by the Pechini method, obtaining homogeneous coatings with uniform composition and high roughness. The (·)OH formed at the DSA surface from H₂O oxidation were not detected by electron spin resonance. However, their indirect determination by means of H₂O₂ measurements revealed that Ti/IrO₂-SnO₂-Sb₂O₅ is able to produce partially physisorbed radicals. Since the characterization of the wastewater revealed the presence of indole derivatives, preliminary bulk electrolyses were done in ultrapure water containing 1 mM indole in sulfate and/or chloride media. The performance of EO with the Ti/IrO₂-Ta₂O₅ anode was evaluated from the TOC removal and the UV/Vis absorbance decay. The mineralization was very poor in 0.05 M Na₂SO₄, whereas it increased considerably at a greater Cl(-) content, meaning that the oxidation mediated by electrogenerated species such as Cl₂, HClO, and/or ClO(-) competes and even predominates over the (·)OH-mediated oxidation. The EO treatment of EC-pretreated dairy wastewater allowed obtaining a global 98 % TOC removal, decreasing from 1,062 to <30 mg L(-1).

Authors+Show Affiliations

Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Unidad Tijuana, Carretera Tijuana-Tecate km 26.6, Consorcio Tecnológico de Baja California, 22444, Tijuana, B.C., Mexico.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24671400

Citation

Borbón, Brenda, et al. "Sequential Electrochemical Treatment of Dairy Wastewater Using Aluminum and DSA-type Anodes." Environmental Science and Pollution Research International, vol. 21, no. 14, 2014, pp. 8573-84.
Borbón B, Oropeza-Guzman MT, Brillas E, et al. Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes. Environ Sci Pollut Res Int. 2014;21(14):8573-84.
Borbón, B., Oropeza-Guzman, M. T., Brillas, E., & Sirés, I. (2014). Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes. Environmental Science and Pollution Research International, 21(14), 8573-84. https://doi.org/10.1007/s11356-014-2787-x
Borbón B, et al. Sequential Electrochemical Treatment of Dairy Wastewater Using Aluminum and DSA-type Anodes. Environ Sci Pollut Res Int. 2014;21(14):8573-84. PubMed PMID: 24671400.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sequential electrochemical treatment of dairy wastewater using aluminum and DSA-type anodes. AU - Borbón,Brenda, AU - Oropeza-Guzman,Mercedes Teresita, AU - Brillas,Enric, AU - Sirés,Ignasi, Y1 - 2014/03/27/ PY - 2014/02/19/received PY - 2014/03/10/accepted PY - 2014/3/28/entrez PY - 2014/3/29/pubmed PY - 2015/6/17/medline SP - 8573 EP - 84 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 21 IS - 14 N2 - Dairy wastewater is characterized by a high content of hardly biodegradable dissolved, colloidal, and suspended organic matter. This work firstly investigates the performance of two individual electrochemical treatments, namely electrocoagulation (EC) and electro-oxidation (EO), in order to finally assess the mineralization ability of a sequential EC/EO process. EC with an Al anode was employed as a primary pretreatment for the conditioning of 800 mL of wastewater. A complete reduction of turbidity, as well as 90 and 81% of chemical oxygen demand (COD) and total organic carbon (TOC) removal, respectively, were achieved after 120 min of EC at 9.09 mA cm(-2). For EO, two kinds of dimensionally stable anodes (DSA) electrodes (Ti/IrO₂-Ta₂O₅ and Ti/IrO₂-SnO₂-Sb₂O₅) were prepared by the Pechini method, obtaining homogeneous coatings with uniform composition and high roughness. The (·)OH formed at the DSA surface from H₂O oxidation were not detected by electron spin resonance. However, their indirect determination by means of H₂O₂ measurements revealed that Ti/IrO₂-SnO₂-Sb₂O₅ is able to produce partially physisorbed radicals. Since the characterization of the wastewater revealed the presence of indole derivatives, preliminary bulk electrolyses were done in ultrapure water containing 1 mM indole in sulfate and/or chloride media. The performance of EO with the Ti/IrO₂-Ta₂O₅ anode was evaluated from the TOC removal and the UV/Vis absorbance decay. The mineralization was very poor in 0.05 M Na₂SO₄, whereas it increased considerably at a greater Cl(-) content, meaning that the oxidation mediated by electrogenerated species such as Cl₂, HClO, and/or ClO(-) competes and even predominates over the (·)OH-mediated oxidation. The EO treatment of EC-pretreated dairy wastewater allowed obtaining a global 98 % TOC removal, decreasing from 1,062 to <30 mg L(-1). SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/24671400/Sequential_electrochemical_treatment_of_dairy_wastewater_using_aluminum_and_DSA_type_anodes_ L2 - https://dx.doi.org/10.1007/s11356-014-2787-x DB - PRIME DP - Unbound Medicine ER -