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The treatment of industrial wastewater originated from soluble coffee production via electrocoagulation - anodic oxidation. Electrodes selection

Published 2020-10-17
Articles

Abstract

The industry of soluble coffee generates wastewater containing complex and hard to degrade mixtures of different substances. Their mineralization is not completely effective through conventional treatment methods. In this work, as a treatment alternative, a sequential Electrocoagulation-Anodic Oxidation (EC-AO) process is studied. The effect of electrode material (v.g., two different anodes (graphite and Boron-Doped Diamond (BDD)) and six different cathodes (stainless steel, titanium, iron, aluminum, graphite and BDD)) and of support electrolyte (NaCl or Na2SO4) on degradation performance of AO, in the terms of color and chemical oxygen demand (COD) reduction, as well as Total Suspended Solids (TSS) formation and pH, were experimentally tested. The obtained results were compared with the most recent Colombian environmental regulation. Additionally, for each case, a comprehensive operational costs analysis was performed. All the above information allowed to select two electrode systems as the most promising for the AO step: BDD-stainless steel + Na2SO4: very efficient but expensive (reduction of COD = 75% and 12 USD/ m3) and graphite-stainless steel + NaCl: less efficient and more economic one (reduction of COD = 67% and 7 USD/m3).

Authors

  • Izabela Dobrosz-Gomez

    Sede Manizales

  • Miguel Angel Gómez García

  • Harold Norbey Ibarra Taquez

References

Aguas De Manizales S.A. E.S.P.; 2016. Estudio de factibilidad para la recuperación y mantenimiento de la calidad de la cuenca del rio Chinchiná, URL: http://cort.as/-Itaf (acceso: 29-05-19).

APHA. 2005. Standard Methods for the Examination of Water and Wastewater. 21st ed. Washington: Centennial edition

Cardenas, A., Zayas, T., Morales, U., Salgado, L., 2009. Electrochemical Oxidation of Wastewaters from the Instant Coffee Industry Using a Dimensionally Stable RuIrCoOx Anode. ECS Trans. 20, 291-299.

Clarke, R.J., Macrae, R., 1985. Coffee: Chemistry, 1st Edition. Ed. Elsevier Applied Science, London pp 45-58.

Couto, R.M., Fernandes, J., da Silva, M.D.R.G., Simoes, P.C., 2009. Supercritical fluid extraction of lipids from spent coffee grounds. J. Supercrit. Fluids 51, 159-166. https://doi.org/10.1002/elsc.200900074

Departamento Administrativo Nacional de Estadística DANE; 2018. Variación mensual del IPC por grupos de bienes y servicios 2017-2018. URL: http://cort.as/-ItaI (acceso: 29-05-19).

Dinsdale, R.M., Hawkes, F.R., Hawkes, D.L., 1996. The mesophilic and thermophilic anaerobic digestion of coffee waste containing coffee grounds. Water Res. 30, 371-377. https://doi.org/10.1016/0043-1354(95)00157-3

Dinsdale, R.M., Hawkes, F.R., Hawkes, D.L., 1997. Comparison of mesophilic and thermophilic upflow anaerobic sludge blanket reactors treating instant coffee production wastewater. Water Res. 31, 163-169. http://dx.doi.org/10.1016/S0043-1354(96)00233-3.

EPM; 2018. Tarifas y Costo de Energía Eléctrica - Mercado Regulado.

URL: http://cort.as/-Ita- (acceso: 29-05-19).

Farah, A., 2012. Coffee Constituents, en: Coffee: Emerging Health Effects and Disease Prevention. Wiley- Blackwell, Oxford, pp. 21-58. http://dx.doi.org/10.1002/9781119949893.ch2.

Federación Nacional de Cafeteros de Colombia, 2019. Información estadística cafetera. URL: http://cort.as/-ItZc (accedido 29/05/19)

Fernandez, N., Forster, C.F., 1993. A study of the operation of mesophilic and thermophilic anaerobic filters treating a synthetic coffee waste. Bioresour. Technol. 45, 223-227. http://dx.doi.org/10.1016/0960-8524(93)90115-R.

Ibarra-Taquez, H.N., GilPavas, E., Blatchley, E.R., Gómez-García, M.Á., Dobrosz-Gómez, I., 2017. Integrated electrocoagulation-electrooxidation process for the treatment of soluble coffee effluent: Optimization of COD degradation and operation time analysis. J. Environ. Manage. 200, 530–538, http://dx.doi.org/10.1016/j.jenvman.2017.05.095

Ibarra-Taquez, H.N., Gómez-García, M.Á., Dobrosz-Gómez, I., 2018. Optimización multiobjetivo del proceso fenton en el tratamiento de aguas residuales provenientes de la producción de café soluble. Información Tecnológica, 29 (5), 111 – 122, http://dx.doi.org/10.4067/S0718-07642018000500111

Kondamudi, N., Mohapatra, S.K., Misra, M., 2008. Spent Coffee Grounds as a Versatile Source of Green Energy. J. Agric. Food Chem. 56, 11757-11760. https://doi.org/10.1021/jf802487s

Marketwatch (2019). Instant Coffee Market 2019 Global Key Players Analysis, Sales, Supply, Demand and Forecast to 2025, URL: http://cort.as/-ItZD

Panchangam, S.C., Janakiraman, K., 2015. Decolorization of aqueous coffee and tea infusions by chemical coagulation. Desalin. Water Treat. 53, 119-125. http://dx.doi.org/10.1080/19443994.2013.860401

Radjenovic, J., Sedlak, D.L., 2015. Challenges and Opportunities for Electrochemical Processes as Next-Generation Technologies for the Treatment of Contaminated Water. Environ. Sci. Technol. 49, 11292-11302. http://dx.doi.org/10.1021/acs.est.5b02414.

Tokumura, M., Ohta, A., Znad, H.T., Kawase, Y., 2006. UV light assisted decolorization of dark brown colored coffee effluent by photo-Fenton reaction. Water Res. 40, 3775-3784. http://dx.doi.org/10.1016/j.watres.2006.08.012

Tokumura, M., Znad, H.T., Kawase, Y., 2008. Decolorization of dark brown colored coffee effluent by solar photo-Fenton reaction: effect of solar light dose on decolorization kinetics. Water Res. 42, 4665-4673. http://dx.doi.org/10.1016/j.watres.2008.08.007.

United States Department of Agriculture. 2018. Soluble Coffee Exports.

http://cort.as/-Itc- (accedido 29/05/19)

Zayas Pérez, T., Geissler, G., Hernandez, F., 2007. Chemical oxygen demand reduction in coffee wastewater through chemical flocculation and advanced oxidation processes. J. Environ. Sci. (China) 19, 300-305.

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