Primary treatment of a soybean protein bearing effluent by dissolved air flotation and by sedimentation

Biocoagulation of dairy wastewater by Lactobacillus casei TISTR 1500 for protein recovery using micro-aerobic sequencing batch reactor (micro-aerobic SBR)

“…The acid fermentation, however, could not be achieved in an anaerobic complete mix bioreactor because pH of wastewater could not be dropped to the isoelectric point in the previous study [10]. In combination with a biocoagulation process with chemical flocculants were also used in a separation step [11]. These promising processes of the pre-treatment had a potential of applications in many products such as animal feed from protein recovery and bioplastics from lactic acid [3,12].…”

Flocculation-enhanced protein recovery from fish processing by-products by isoelectric solubilization/precipitation

“…In our present experiments, we also introduced air bubbles in the jar tester with flocculated fish proteins. Similar to Schneider et al (1995), the air bubbles induced a floatation of precipitated fish proteins (Fig. 5).…”

“…Myosin solubilized at acidic and basic pH increased hydrophobicity when compared to its native counterpart; however, the basic solubilization caused a greater increase of hydrophobicity than the acidic treatment. Schneider et al (1995) concluded that the protein hydrophobicity was a prerequisite for efficient protein separation with the DAF. We plan to investigate separation of precipitated fish muscle proteins with the DAF.…”

“…Schneider, Manera-Neto, Soares, Rech, and Rubio (1995) successfully flocculated these water-soluble proteins with an anionic flocculent of high molecular weight followed by their recovery with dissolved air flotation (DAF). Similar to results in the present study, Schneider et al (1995) also found that cationic flocculants did not facilitate protein separation from the process water. In addition, soy protein flocks were resistant to agitation, which was consistent with our observation of the fish protein flocks.…”

“…Therefore, the DAF may be an alternative separation technique to remove precipitated and flocculated fish muscle protein from the process water. Schneider et al (1995) determined that the isoelectrically precipitated soy proteins increased their hydrophobicity following their flocculation with the anionic flocculent. Kristinsson and Hultin (2003) measured surface hydrophobicity by ANS (1-anilino-8-naphthal-enesulfonic acid) flourescence of native cod muscle protein (myosin) and compared it with that of myosin solubilized at basic (pH 11.0) and acidic (pH 2.5) pH followed by refolding of the solubilized protein at pH 7.5.…”