Simulation of ammonia removal from industrial wastewater streams by means of a hollow-fiber membrane contactor

Abstract

Simulación computacional de la concentración por evaporación osmótica del jugo de maracuyá (Passiflora edullis)Simulação computacional da concentração por evaporação osmótica do suco de maracujá (Passiflora edullis)Freddy Forero-Longas * Adriana Patricia Pulido-Díaz ** Kelly Johana Pedroza-Berrío *** AbstractThis study aimed at implementing a comprehensive strategy for the multiphysics simulation of the osmotic evaporation process applied in the concentration of passion fruit juice. The phenomena of mass and momentum transfer were analyzed in Comsol ® and Matlab ® , using a two-dimensional axial geometry as a simplification of the membrane module. Computer simulations were validated through comparisons with experimental data obtained from osmotic evaporation of passion fruit juice previously ultrafiltrated. The juice was concentrated to 52.25 ± 0.36 (°Brix) of soluble solids, reaching a final flux of 0.63 (kg/m 2 h) after 6 hours. The concentrate retained the organoleptic and physicochemical quality characteristics of the original juice when it was reconstituted in water. The models and simulations developed can be used to describe, analyze, and efficiently improve the osmotic evaporation process applied to the concentration of juices.Keywords: computational simulation; hydrophobic membrane; mass transfer; passion fruit. * Ph.D. Universidad de Antioquia (Medellín-Antioquia, Colombia). freddy.forero@udea.edu.co. ** Universidad del Valle (Cali-Valle, Colombia). adriana.pulido@correounivalle.edu.co. *** Corpoica (Espinal-Tolima, Colombia). kpedroza@corpoica.org.co. ResumenEl objetivo de este estudio fue aplicar una estrategia integral para la simulación multifísica del proceso de evaporación osmótica aplicada en la concentración del jugo de maracuyá. Los fenómenos de transferencia de masa y momento fueron implementados en Comsol ® y Matlab ® , usando una geometría axial en dos dimensiones como simplificación del módulo de membranas, y las simulaciones computacionales fueron validadas por comparación con datos experimentales obtenidos de la evaporación osmótica de jugo de maracuyá previamente ultrafiltrado. El jugo fue concentrado hasta 52.25 ± 0.36 (°Brix) de sólidos solubles, alcanzando un flux final de 0.63 (kg/m 2 h) después de 6 horas. El concentrado conservó las características de calidad organolépticas y fisicoquímicas del jugo original al ser reconstituido en agua. Se comprobó que los modelos y las simulaciones desarrollados pueden ser usados para describir, analizar y mejorar de forma más rápida y eficiente el proceso de evaporación osmótica aplicado a la concentración de jugos.Palabras clave: maracuyá; membrana hidrófoba; simulación computacional; transferencia de masa. ResumoO objetivo deste estudo foi aplicar uma estratégia integral para a simulação multifísica do processo de evaporação osmótica aplicada na concentração do suco de maracujá. Os fenômenos de transferência de massa e momento foram implementados em Comsol® e Matlab®, usando uma geometria axial em duas dimensões como simplificação do módulo...

Trace ammonium removal by liquid–liquid membrane contactors as water polishing step of water electrolysis for hydrogen production from a wastewater treatment plant effluent

“…The algorithm used in this study takes into account unsteady state and isothermal conditions and considers the Henry law applicable at the feed–membrane interface, with no pore blockage, feed aqueous solution not filling the membrane pores, instantaneous ammonia reaction with the sulfuric acid solution, sulfuric concentration in the receiving phase in excess throughout the experiment, flow rates of ammonium and sulfuric acid solutions constant, and feed tank operates in perfect mixing mode. It integrates the assumptions made by previous studies into one single approach, but introducing for the first time, the effect of the pH buffer capacity of the feed stream. The model was validated using the experimental data obtained with the membrane contactor set‐up.…”

“…The mechanism of removal of ammonium using hollow fiber membrane contactors (HFMC) has been the subject of many studies . The cited studies were devoted to enhancing ammonium extraction efficiency by optimizing the operating conditions to achieve high recovery ratios.…”

Computational simulation of concentration by osmotic evaporation of passion fruit juice (Passiflora edullis)

“…These two conditions lead to a higher differential vapor pressure on the surface, and a removal of the concentrated solution (viscous layer) that acts as a water transport resistance. However, if velocity increases too much, the residence time inside the module may be reduced [26]. …”

Start-up and performance of UASB reactors using zeolite for improvement of nitrate removal process

“…There are physicochemical and biological methods for removing the nitrogen present in wastewaters (Zhang et al, 2009;Andalib et al, 2012;Malekian et al, 2011;Montalvo et al, 2011;Rezakazemi et al, 2012;Bravo et al, 2013;Jiang et al, 2013;Yu et al, 2013). Physicochemical methods do not completely solve the problem because they transfer the pollutants from one matrix to another and are not cost effective.…”