Publications Scientifiques
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Item Recovery of proteins from EDAM whey using membrane ultrafiltration(University of M’HAMED Bougara Boumerdes, 2015) Yelles- Allam, F.; Nouan, A.A.In Algeria, whey is discharged without any treatment and this causes not only pollution problem, but also a loss in nutritive components of milk. In this paper, characterization of EDAM whey is done, which is resulted from pasteurised mixture of cow’s milk and skim milk. The recovery of whey protein by ultrafiltration/diafiltration, was studied. The physical-chemical analysis of whey has emphasized on its pollutant and nutritive characteristics. In fact, its BDO5 and CDO are 49.33, and 127.71 g of O2/l of whey respectively. It contains: fat (1,90±0,1 gr/l), lactose (47.32±0,57 gr/l), proteins (5,82±0,4gr/l) and ashes 4.53±0.15gr/l, calcium (0,518gr/l), Na (1.104gr/l), K (1.014 gr/l), Mg (0.118 gr/l) and P (0.482 gr/l). Tangential ultrafiltration of whey after treatment was carried out in a polyetersulfone membrane with a cut-off of 10K. Its hydraulic intrinsic resistance (Rm) and permeability (Lp) are respectively: 2.041.1012 m-1 and 176, 32 l/h.m2bar. The dry matter obtained at FC6 is of 70.25 g/l, containing 16.33g/l of proteins. The retention rate of protein is 98.18 % and the decrease in BDO5 and CDO are at 18.875 and 42.818 g of O2/liter of permeate respectively. Diafiltration performed on concentred retentat allowed the complete removal of lactose and minerals. The ultrafiltration of the whey before the disposal is an alternative for Algéria dairy industryItem Valorisation du lactosérum par technique membranaire(Aljest, 2018) Lachebi, Samia; Yelles, F.La quantité du lactosérum produite chaque année, à partir de 20000 litres de lait mis en oeuvre par jour pour la fabrication de camembert tassili, a été estimée à 5 840 000 litres soit 581 605.6 kg d’éléments nutritifs qui sont purement et simplement évacués dans les effluents de la laiterie de Draa Ben Khedda. L’analyse biochimique du sérum a permis de mettre en évidence des aptitudes nutritionnelles très intéressantes pour l’alimentation humaine. En effet, le lactosérum est caractérisé par sa richesse en matière sèche représentant 67.02 % des éléments nutritifs originaires du lait. Il est riche en lactose, protéines, matière grasse et éléments minéraux représentants respectivement 64.34 %, 5.63 %, 2. 55% et 8.35 %. Et d’autre part d’après les valeurs très élevées obtenues de la DCO (127 712 mg d’O2/l) et la DBO5 (49333.32 mg d’O2/l), nous pouvons affirmer que ce sous produits est un facteur de pollution très redoutable de l’environnement donc il serait nécessaire de le valoriser. L’objectif de notre étude vise à récupérer les protéines du lactosérum par le procédé d’ultrafiltration et de réduire ainsi le caractère polluant de ce sous produit par l’utilisation d’une membrane en polyéther-sulfone (PES) et de 10KDa de seuil de coupure. L’influence de la pression transmembranaire sur le flux de permeation sera étudiée et le taux de rétention des protéines ainsi que l’évolution du colmatage de la membrane seront déterminés.Item Whey ultrafiltration : effect of pH on permeate flux and proteins retention(2015) Yelles, Fouzia; Nouani, Abdelouahab; Kahlouche, Amal; Belbraouet, SlimaneItem Electrokinetic analysis of PES/PVP membranes aged by sodium hypochlorite solutions at different pH(Elsevier, 2016) Hanafi, Yamina; Loulergue, Patrick; Ababou-Girard, Soraya; Meriadec, Cristelle; Rabiller-Baudry, Murielle; Baddari, Kamel; Szymczyk, AnthonyItem Purification of water effluent from a milk factory by ultrafiltration using algerian clay support(2004) Khider, K.; Akretche, D.E.; Larbot, A.A milk factory sited at Boudouaou (40 km from Algiers) rejects a great quantity of effluent which contains soft whey. 8,000 1 are treated twice a week and are rejected into a river which supplies drinking water to the town population. Some analyses have shown an increase in the water acidity and both the BDO (biological demand of oxygen) and CDO (chemical demand of oxygen) attained 40,000 and 1,800 respectively. This is due to the presence of the lactose coupled with some organic matter. In this work, the purification of water is attempted by ultrafiltration using both gamma ahtmina and TiO2 membranes. Commercial mineral supports were used and their performance was compared to other supports elaborated from a natural Algerian clay (attapulgite). The results obtained have shown a good retention of lactose and total proteins giving rise to a pure water with a BDO of 90 and a DCO of 62. Moreover, the study of the influence of the pressure and the variation of the water flux has shown an improvement of the process through the use of the local clay support. Thus, this is appropriate for an economical and safe treatment of this water. Moreover, it combines a recovery of a valuable matter, which is the whey