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Sustainability 2018, 10(1), 83; doi:10.3390/su10010083

Evaluation of Hydraulic Retention Time on Treatment of Coffee Processing Wastewater (CPWW) in EGSB Bioreactor

1
Faculty of Engineering, University of Science and Arts of Chiapas, Libramiento Norte Poniente No. 1150, Lajas Maciel, Tuxtla Gutiérrez C.P. 29039, Mexico
2
Center for Research and Technological Development in Renewal Energies, University of Science and Arts of Chiapas, Libramiento Norte Poniente 1150, Lajas Maciel, Tuxtla Gutiérrez C.P. 29039, Mexico
3
Professor CONACYT, Department of Chemical and Biochemistry Engineering, National Institute of Technology of Mexico-Tuxtla Gutiérrez Institute of Technology, Carretera Panamericana Km 1080, Tuxtla Gutiérrez C.P. 29050, Mexico
4
Department of Chemical and Biochemistry Engineering, National Institute of Technology of Mexico-Tuxtla Gutiérrez Institute of Technology, Carretera Panamericana Km 1080, Tuxtla Gutiérrez C.P. 29050, Mexico
*
Authors to whom correspondence should be addressed.
Received: 11 December 2017 / Revised: 23 December 2017 / Accepted: 23 December 2017 / Published: 30 December 2017
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Abstract

The coffee processing agro-industry generates large quantities of wastewater requiring systematic treatment prior to disposal. For this reason, the aim of this study was to evaluate the hydraulic retention times (HRT) in treatment of coffee processing wastewater (CPWW) using a laboratory scale Expanded Granular Sludge Bed (EGSB) bioreactor at different HRT (3 to 9 days). The EGSB was evaluated in mesophilic condition (26 ± 2 °C) with an average pH of 7.5 ± 0.2 to determine the chemical oxygen demand (COD) removal efficiency. According to the results, the COD removal efficiency increases from 94 to 98% when the HRT increase from 3 to 9 days; the α factor remained stable (0.98) throughout the evolution of the bioreactor. The HRT´s between 7–9 days generated effluents capable to be dischargeable into water bodies with a permitted COD concentration according to World Health Organization (WHO) and Official Mexican Environmental Regulations permissible limits. Results evidenced that the HRT of 9 days was the one that greater COD removal generated, so the EGSB bioreactor can be a sustainable alternative to solve the environmental problems, compared to other conventional methods to CPWW treatment. View Full-Text
Keywords: anaerobic EGSB reactor; coffee processing wastewater; HRT; chemical oxygen demand; wastewater treatment anaerobic EGSB reactor; coffee processing wastewater; HRT; chemical oxygen demand; wastewater treatment
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Cruz-Salomón, A.; Ríos-Valdovinos, E.; Pola-Albores, F.; Lagunas-Rivera, S.; Meza-Gordillo, R.; Ruíz-Valdiviezo, V.M. Evaluation of Hydraulic Retention Time on Treatment of Coffee Processing Wastewater (CPWW) in EGSB Bioreactor. Sustainability 2018, 10, 83.

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