Coffee Pulp: A Sustainable Alternative Removal of Cr (VI) in Wastewaters

Abstract

Currently, agricultural waste is proposed as a sustainable alternative in the removal of heavy metals present in industrial wastewater, to fulfill some of the goals proposed in the Sustainable Development Goals stated for the 2030 Agenda, in particular in Sections 3.9 and 6.9. Considering this context, the coffee pulp (Castilla variety) of Caldas municipality (Colombia) was used in study for the removal of one of the most toxic chemical species of chromium: Cr (VI). Therefore, the agricultural residue was subjected to a bromatological characterization, determination of the lignocellulosic composition and elucidation of characteristic organic functional groups by IR spectrophotometry. Additionally, the optimal parameters for contaminant removal were identified, regarding particle size, biomass quantity, optimum pH, stirring time, temperature, adsorption kinetics, zero charge potential (pHpzc) and adsorption isotherms, to analyze the kinetic model that fitted the process, the explanation of the possible adsorption mechanism between the contaminant, the surface of the coffee pulp and the capacity of maximum adsorption, respectively. Finally, the innovation of the research is discussed considering two criteria: First, when a mixture was made in different proportions between two agricultural residues (coffee pulp and plantain pseudostem) to show if there was an increase in the removal of the contaminant under the same optimal conditions found experimentally; and the second criterion, the comparison of the maximum adsorption capacity, with the percentages of removal carried out by other authors using the pulp of unmodified coffee.

Biosorption of Pb(II) Using Coffee Pulp as a Sustainable Alternative for Wastewater Treatment

“…The ANSI (American National Standards Institute, Washington, DC, USA)/ASTM (American Society for Testing and Materials, West Conshohocken, PA, USA) techniques were used for the determination of the lignocellulosic content [29].…”

Coffee Pulp: An Industrial By-product with Uses in Agriculture, Nutrition and Biotechnology

“…Such bio-package production using fiber and starch waste would contribute to the protection of the environment, and reducing the use of plastic containers which typically have degradation times in the order of centuries (Gross and Kalra, 2002). As an additional environmental benefit, the lignocellulose composition and adsorption capacity of coffee pulp (Aguilar et al, 2019) could be used as a low-cost alternative method for the removal of heavy metals that often contaminate waste water.…”

Tecnologías no convencionales para la remoción de plomo presente en aguas residuales: una revisión bibliográfica 2010-2019

“…Uno de los retos del siglo XXI es mitigar el impacto ambiental producido por los metales pesados provenientes de actividades antropogénicas de sectores industriales, como: explotaciones mineras, fotografía, cerámicas, pinturas, galvanoplastia, electrónica y curtiembres, entre otras (León, Córdoba y Carreño, 2016;Gómez et al, 2019). Esto se debe a que dichos contaminantes inorgánicos no se biodegradan, se bioacumulan y se biomagnifican a lo largo de la cadena trófica, trayendo impactos negativos al ecosistema (Londoño-Franco, Londoño-Muñoz y Muñoz-García, 2016).…”