Published date: Aug 29 2021

Journal Title: ESPOCH Congresses: The Ecuadorian Journal of S.T.E.A.M.

Issue title: Volume 1, Issue 2

Pages: 942–952

DOI: 10.18502/espoch.v1i2.9512

Diego Juela Quintuñadiego.juela@ucuenca.edu.ecUniversidad de Cuenca, Facultad de Ciencias Químicas, Departamento de Ingeniería Química, Cuenca, Ecuador

Cocoa shell is a potential adsorbent for the removal of pollutants from wastewater. The goal of this study was to compare, model and simulate the removal of Pb²⁺ and Cd²⁺ in a fixed bed column using cocoa shell. The experimental studies were carried out in a laboratory burette with a bed height of 10.5 cm, a volumetric flow of 2 mL/min, and a metal concentration of 10 mg/L. The empirical models of Thomas, Dose-Response, and Wang were used to study the dynamic behavior of biosorption, in addition a mathematical model based on a differential mass balance of the column was proposed to study the effect of the axial dispersion phenomenon. The results indicated that the active sites of cocoa shell have a higher affinity for the Pb²⁺ cation, with breakthrough and saturation times higher than Cd²⁺. The Dose-Response model was the one that presented the best fit with experimental data, confirming that the adsorption capacity of the cocoa shell is superior with Pb²⁺. The axial dispersion phenomenon is relevant and should not be neglected in the approach of laboratory scale models.

Keywords: cocoa shell, biosorption, heavy metals, numerical simulation.

Resumen

La corteza de cacao es un potencial adsorbente para la eliminación de contaminantes de aguas residuales. El objetivo de este estudio fue comparar, modelar y simular la remoción de Pb²⁺ y Cd²⁺ en columna de lecho fijo utilizando corteza de cacao. Los estudios experimentales se llevaron a cabo en una bureta de laboratorio con una altura de lecho de 10.5 cm, flujo volumétrico de 2 mL/min, y concentración de metal de 10 mg/L. Los modelos empíricos de Thomas, Dosis-Respuesta, y Wang fueron usados para estudiar el comportamiento dinámico de la biosorción, adicionalmente un modelo matemático basado en un balance de masa diferencial de la columna fue planteado para estudiar el efecto del fenómeno de dispersión axial. Los resultados señalaron que los sitios activos de la corteza de cacao tienen mayor afinidad por el catión Pb²⁺, con tiempos de ruptura y saturación superiores a la del Cd²⁺. El modelo Dosis- Respuesta fue el que presento mejor ajuste con los datos experimentales, confirmando que la capacidad de adsorción de la corteza es superior con Pb²⁺. El fenómeno de dispersión axial es relevante y no debe ser despreciado en el planteamiento de modelos a escala de laboratorio.

Palabras Clave: Corteza de cacao, biosorción, metales pesados, simulación numérica.

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