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Communication Dans Un Congrès Année : 2015

RECYCLED SOILED CIP SOLUTIONS FOR MEMBRANES CLEANING: APPLICATION TO UF OF WHEY PROTEINS

Résumé

Processing soiled Cleaning In Place (CIP) solutions induces large economic and environmental costs, especially in dairy plants. Hence, recycling such solutions appears as an attractive alternative to reduce these costs. An original regeneration process of CIP solutions combining adsorption/coagulation and flocculation operations was designed to remove both soluble and insoluble matters of soiled lyes. Solutions of potash (KOH) and caustic soda (NaOH) soiled with 1% (v/v) of whole milk were submitted up to twenty successive regeneration cycles. The multiple recycling of regenerated solutions resulted in increased turbidity, total chemical oxygen demand (COD t) and total nitrogen (TN) content whereas surface tension (γ) was decreased. Along regeneration cycles, potash solutions exhibit a lower TN increase and a faster reduction of γ leading to a significantly lower critical micelle concentration (32 vs.36 mN.m-1). The saponification of fatty acids and the proteins' hydrolysis into amino acids likely originate the observed improvement of the cleaning efficiency of the recycled solutions. Though membrane technologies are widespread processes in dairies, it remains that the major obstacle to their prevalent use is the membrane fouling which cause severe flux decline and affect the quality of the products. The permeability recovery requires frequent alkaline cleanings. Usually, this step is achieved by formulated commercial lyes. The cleaning of polyethersulfone (PES) UF membranes fouled with whey proteins was performed by a commercial detergent (Ultrasil 115), or by freshly prepared or regenerated KOH and NaOH solutions. Membrane permeability was determined by measuring the permeate flux before and after the washing operation. Chemical cleanliness was assessed by evaluating the amount of residual proteins on the membrane by UV-vis and infrared optical density measurements. Whereas a total flux recovery (FR) was observed with Ultrasil 115, a lower FR was observed with fresh NaOH and KOH solutions (74.6 and 61.7% respectively). For KOH regenerated solutions, the FR increases with the regenerations to reach 100% at the twentieth cycle whereas a plateau between 75 and 80% is reached for NaOH lyes. The UV-vis absorbency measurements indicate an important reduction of the amount of proteins deposited on the membrane before and after the cleanings (730 to 0-130 µg/cm 2). Infrared observations further support a reduced deposit of proteins on the membrane's surface
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Dates et versions

hal-02344502 , version 1 (06-11-2019)

Identifiants

  • HAL Id : hal-02344502 , version 1

Citer

Marie Furic, Anne Elain, W. Blel, Olivier Sire. RECYCLED SOILED CIP SOLUTIONS FOR MEMBRANES CLEANING: APPLICATION TO UF OF WHEY PROTEINS. ECCE10 (10th European Congress of Chemical Engineering), Sep 2015, Nice, France. ⟨hal-02344502⟩
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