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Performance of (in)active anodic materials for the electrooxidation of phenolic wastewaters from cashew-nut processing industry.
Chemosphere. 2018 Jun; 201:740-748.C

Abstract

This study investigated the anodic oxidation of phenolic wastewater generated by cashew-nut processing industry (CNPI) using active (Ti/RuO2-TiO2) and inactive (boron doped diamond, BDD) anodes. During electrochemical treatment, various operating parameters were investigated, such as current density, chemical oxygen demand (COD), total phenols, O2 production, temperature, pH, as well as current efficiency and energy consumption. After electrolysis under optimized working conditions, samples were evaluated by chromatography and toxicological tests against L. sativa. When both electrode materials were compared under the same operating conditions, higher COD removal efficiency was achieved for BDD anode; achieving lower energy requirements when compared with the values estimated for Ti/RuO2-TiO2. The presence of Cl- in the wastewater promoted the electrogeneration of strong oxidant species as chlorine, hypochlorite and mainly hypochlorous acid, increasing the efficiency of degradation process. Regarding the temperature effect, BDD showed slower performances than those achieved for Ti/RuO2-TiO2. Chromatographic and phytotoxicity studies indicated formation of some by-products after electrolytic process, regardless of the anode evaluated, and phytotoxic action of the effluent. Results encourage the applicability of the electrochemical method as wastewater treatment process for the CNPI, reducing depuration time.

Authors+Show Affiliations

Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil.Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil.Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil.Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil; Center of Science and Technology, Federal University of Cariri, Av. Tenente Raimundo Rocha, Cidade Universitária, 63048-080, Juazeiro do Norte - CE, Brazil.Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitário, 59078-970, Natal, RN, Brazil.São Carlos Institute of Chemistry, University of São Paulo, Avenida Trabalhador São Carlense 400, 13566-590, São Carlos, SP, Brazil.Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil.Faculty of Exact and Natural Sciences, State University of Rio Grande do Norte, Campus Central, 59625-620, Mossoro, RN, Brazil. Electronic address: suelycastro@uern.br.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29547862

Citation

Oliveira, Edna M S., et al. "Performance of (in)active Anodic Materials for the Electrooxidation of Phenolic Wastewaters From Cashew-nut Processing Industry." Chemosphere, vol. 201, 2018, pp. 740-748.
Oliveira EMS, Silva FR, Morais CCO, et al. Performance of (in)active anodic materials for the electrooxidation of phenolic wastewaters from cashew-nut processing industry. Chemosphere. 2018;201:740-748.
Oliveira, E. M. S., Silva, F. R., Morais, C. C. O., Oliveira, T. M. B. F., Martínez-Huitle, C. A., Motheo, A. J., Albuquerque, C. C., & Castro, S. S. L. (2018). Performance of (in)active anodic materials for the electrooxidation of phenolic wastewaters from cashew-nut processing industry. Chemosphere, 201, 740-748. https://doi.org/10.1016/j.chemosphere.2018.02.037
Oliveira EMS, et al. Performance of (in)active Anodic Materials for the Electrooxidation of Phenolic Wastewaters From Cashew-nut Processing Industry. Chemosphere. 2018;201:740-748. PubMed PMID: 29547862.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Performance of (in)active anodic materials for the electrooxidation of phenolic wastewaters from cashew-nut processing industry. AU - Oliveira,Edna M S, AU - Silva,Francisco R, AU - Morais,Crislânia C O, AU - Oliveira,Thiago Mielle B F, AU - Martínez-Huitle,Carlos A, AU - Motheo,Artur J, AU - Albuquerque,Cynthia C, AU - Castro,Suely S L, Y1 - 2018/02/09/ PY - 2017/07/26/received PY - 2018/02/05/revised PY - 2018/02/06/accepted PY - 2018/3/17/pubmed PY - 2018/6/28/medline PY - 2018/3/17/entrez KW - Active chlorine KW - Anodic oxidation KW - Boron doped diamond KW - Dimensionally stable anode KW - Electrochemical degradation KW - Wastewater treatment SP - 740 EP - 748 JF - Chemosphere JO - Chemosphere VL - 201 N2 - This study investigated the anodic oxidation of phenolic wastewater generated by cashew-nut processing industry (CNPI) using active (Ti/RuO2-TiO2) and inactive (boron doped diamond, BDD) anodes. During electrochemical treatment, various operating parameters were investigated, such as current density, chemical oxygen demand (COD), total phenols, O2 production, temperature, pH, as well as current efficiency and energy consumption. After electrolysis under optimized working conditions, samples were evaluated by chromatography and toxicological tests against L. sativa. When both electrode materials were compared under the same operating conditions, higher COD removal efficiency was achieved for BDD anode; achieving lower energy requirements when compared with the values estimated for Ti/RuO2-TiO2. The presence of Cl- in the wastewater promoted the electrogeneration of strong oxidant species as chlorine, hypochlorite and mainly hypochlorous acid, increasing the efficiency of degradation process. Regarding the temperature effect, BDD showed slower performances than those achieved for Ti/RuO2-TiO2. Chromatographic and phytotoxicity studies indicated formation of some by-products after electrolytic process, regardless of the anode evaluated, and phytotoxic action of the effluent. Results encourage the applicability of the electrochemical method as wastewater treatment process for the CNPI, reducing depuration time. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29547862/Performance_of__in_active_anodic_materials_for_the_electrooxidation_of_phenolic_wastewaters_from_cashew_nut_processing_industry_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)30237-6 DB - PRIME DP - Unbound Medicine ER -