Recovery of magnesium and protein from soy tofu whey by electrodialytic configurations

Abstract

Electrodialysis (ED), bipolar-membrane electro-acidi®cation (BMEA), and a combination of ED followed by BMEA (EDBMEA) were evaluated for magnesium (Mg) and protein recovery and electrical energy consumption when processing soy tofu whey that was manufactured using magnesium chloride as a protein coagulant. ED processing for 30 min and BMEA processing for 60 min recovered 18.4% and 14.3% of the soy tofu whey Mg respectively. BMEA processing for 60 min recovered 22.7% of the soy tofu whey protein. The combination of ED processing for 60 min followed by BMEA for 60 min recovered 65% and 34.7% of the soy tofu whey Mg and protein, respectively.

Ion-exchange membrane mediated electrodialysis of scallop broth: Ion, free amino acid and heavy metal profiles

“…Compared to biological and biochemical methods, electrodialysis using ion-exchange membranes is a separation treatment utilising electrophoresis of ionic substances in solutions and the selective permeability of ionised inorganic and ionised organic exchange membranes (Perry & Chilton, 1973). Electrodialysis separation has been widely applied to recovery or purification of ions, ionised organic acids and heavy metals in wastewaters (Andrés & Alvarez, 1993;Andrés, Riera, & Alvarez, 1997;Audinos, 1983;Bazinet, Ippersiel, & Lamarche, 1999;Gain et al, 2002;Koide & Satta, 2004;Oya, 1973) among other applications. Fig.…”

Integration of conventional electrodialysis and electrodialysis with bipolar membranes for production of organic acids

“…For this purpose, conventional electrodialysis (CED) can be employed to concentrate organic salts and feed the concentrate to EDBM. Such concept has been applied to process dairy products [5,6] and organic salts [2,7], and acquired positive effects. Note that these integrations had CED and EDBM operate separately, i.e., the dilute solution of salt was first concentrated to a high level in CED and then fed into EDBM.…”

Identification of Fouling Occurring during Coupled Electrodialysis and Bipolar Membrane Electrodialysis Treatment for Tofu Whey Protein Recovery

“…The membrane electrical conductivity was calculated using the membrane thic measurements and the electrical resistance obtained from the membrane conductan The membrane conductance was measured using a YSI conductivity meter mode (Yellow Springs Instrument Co., Yellow Springs, OH, USA) equipped with a specia signed clip from the Laboratoire des Matériaux Échangeurs d'Ions (Université Par Créteil, Val de Marne, France). Six measurements were taken at different locations membranes, and the average conductance was used to calculate the conductivity [2 The membrane electrical resistance was calculated according to Lteif et al (199 Lebrun et al (2003) [28,29], using Equation (1):…”

“…During the ED phase, the tofu whey was demineralized, and therefore, the ionic strength was lowered. This allowed protein precipitation during the second phase, consisting of the electro-acidification of tofu whey by EDBM [2,3]. In their previous…”