Experimental study of lactose hydrolysis and separation in cstr-uf membrane reactor

Namvar–Mahboub, Mahdieh; Pakizeh, Majid

doi:10.1590/s0104-66322012000300018

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…Yoghurts which are made using ultrafiltered skim milk before acid whey draining (RY‐2 and GY‐3) contained lower amounts of lactose compared to RY‐1 (Table ). This certainly can be attributed to the low molecular weight of lactose (342 Da), which is to pass freely through the UF membrane during the milk concentration process (Namvar‐Mahboub and Pakizeh ). Although a greater concentration effect was achieved in GY‐3, the lower lactose and higher LA contents were observed in GY‐1 and GY‐2 compared to GY‐3.…”

Section: Resultsmentioning

confidence: 99%

Preconcentration of yoghurt base by ultrafiltration for reduction in acid whey generation during Greek yoghurt manufacturing

Uduwerella

Chandrapala

Vasiljevic

2017

Int J of Dairy Tech

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The feasibility of applying ultrafiltration (UF) to concentrate a yoghurt base prior to fermentation during Greek yoghurt manufacturing was studied as a way of minimising acid whey (AW) generation. Two Greek yoghurts were prepared by concentrating a milk base through UF to 13.8% and 17.5% (w/w) (GY‐2, GY‐3). Production of GY‐3 resulted in zero AW discharge, while the GY‐2 production discharged 78% lower AW compared to the control (GY‐1). GY‐2 exhibited a hard gel structure, low syneresis, maximum viscosity properties and a high protein and fat content. Applying both, UF and straining, resulted yoghurts with required structural attributes while substantially reducing the generation of AW.

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Section: Resultsmentioning

confidence: 99%

Preconcentration of yoghurt base by ultrafiltration for reduction in acid whey generation during Greek yoghurt manufacturing

Uduwerella

Chandrapala

Vasiljevic

2017

Int J of Dairy Tech

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“…PES UF flat membranes on the industrial scale are considered to be technically and economical feasible for treatment of leather and distillery effluents (Huang et al, 1994). Ultrafiltration has wide application in the recovery of milk solids (Briao and Tavares, 2012) and disposal of effluents from dairy waste water (Namvar Mahboub and Pakizeh, 2012). Therefore, polymers are the most important materials economically available to prepare membranes that can be prepared over a wide range of film-forming options and modified to achieve tailored properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Studies on Polyethersulfone Ultrafiltration Membranes Modified With Gelatin for Treatment of Tannery and Distillery Wastewater

Velu

Loganathan

Arthanareeswaran

2015

Braz. J. Chem. Eng.

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-In this study polyethersulfone ultrafiltration membrane were prepared with the modifier gelatin at 0, 5, 10, 15 and 20 wt % using DMF as solvent by phase inversion process. Morphologies and characteristics of the membranes were investigated through the methods of SEM, XRD, contact angle measurements. The performance of the modified membrane for the treatment of leather and distillery wastewater through a deadend ultrafiltration process was studied. Morphological investigation showed that the 10% gelatin content in 90% PES results in a two layer structure with a porous top and homogeneous sub-layer with uniform number of pores on the surface. The pure water flux of the modified membrane increases with gelatin concentration, which results in better permeation for both leather and distillery wastewater. In addition to 80-90% reduction in BOD and COD, all modified PES UF membranes showed moderate removal of total suspended and dissolved solids, chlorides, sulphate, oil and grease, potassium, sodium and ammonical nitrogen, apart from color removal.

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“…mediterranei was unable to utilize lactose, enzymatically hydrolyzed R-NF was used as the sole carbon source. The enzymatic hydrolysis was preferred to acid one (that also requires high temperature) since more sustainable from both technical and economic point of views [ 74 ].The enzyme was chosen among commercial and relatively cheap preparations commonly used in dairy processes to hydrolyze lactose in glucose and galactose for lactose-free food production. The ability of H. mediterranei to metabolize both glucose and galactose was previously reported [ 75 ].…”

Section: Discussionmentioning

confidence: 99%

Production of the Polyhydroxyalkanoate PHBV from Ricotta Cheese Exhausted Whey by Haloferax mediterranei Fermentation

Raho¹,

Carofiglio²,

Montemurro

et al. 2020

Foods

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In the last decade, the dairy industry underwent a rapid expansion due to the increasing demand of milk-based products, resulting in high quantity of wastewater, i.e., whey and ricotta cheese exhausted whey (RCEW). Although containing high content of nutritional compounds, dairy by-products are still disposed as waste rather being reintroduced in a new production chain, hence leading to environmental and economic issues. This study proposes a new biotechnological approach based on the combination of membrane filtration and fermentation to produce poly-hydroxyalkanoates (PHA), biodegradable bioplastics candidate as an alternative to petroleum-derived plastics. The protocol, exploiting the metabolic capability Haloferax mediterranei to synthesize PHA from RCEW carbon sources, was set up under laboratory and pilot scale conditions. A multi-step fractionation was used to recover a RCEW fraction containing 12.6% (w/v) of lactose, then subjected to an enzymatic treatment aimed at releasing glucose and galactose. Fermentation conditions (culture medium for the microorganism propagation, inoculum size, time, and temperature of incubation) were selected according to the maximization of polymer synthesis, under in-flasks experiments. The PHA production was then tested using a bioreactor system, under stable and monitored pH, temperature, and stirring conditions. The amount of the polymer recovered corresponded to 1.18 g/L. The differential scanning calorimetry (DSC) analysis revealed the poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as the polymer synthesized, with a relatively high presence of hydroxyvalerate (HV). Identity and purity of the polymer were confirmed by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and X-ray photoelectron (XPS) spectroscopy analyses. By combining the fractionation of RCEW, one of the most abundant by-products from the agri-food industry, and the use of the halophile Hfx mediterranei, the production of PHBV with high purity and low crystallinity has successfully been optimized. The process, tested up to pilot scale conditions, may be further implemented (e.g., through fed-batch systems) and used for large-scale production of bioplastics, reducing the economical and environmental issues related the RCEW disposal.

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Experimental study of lactose hydrolysis and separation in cstr-uf membrane reactor

Cited by 6 publications

References 25 publications

Preconcentration of yoghurt base by ultrafiltration for reduction in acid whey generation during Greek yoghurt manufacturing

Preconcentration of yoghurt base by ultrafiltration for reduction in acid whey generation during Greek yoghurt manufacturing

Preparation and Performance Studies on Polyethersulfone Ultrafiltration Membranes Modified With Gelatin for Treatment of Tannery and Distillery Wastewater

Production of the Polyhydroxyalkanoate PHBV from Ricotta Cheese Exhausted Whey by Haloferax mediterranei Fermentation

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