Research Article Open Access

Regeneration of Lyes for Cleaning-In-Place (CIP) Processes in Dairies: Comparison of Recycled Potash and Soda Solutions Cleaning Properties

Marie Furic1, Anne Elain1, Walid Blel2 and Olivier Sire1
  • 1 Université de Bretagne-Sud, France
  • 2 37 Bd de l’Université, France
American Journal of Applied Sciences
Volume 12 No. 5, 2015, 329-334

DOI: https://doi.org/10.3844/ajassp.2015.329.334

Submitted On: 19 February 2015 Published On: 6 July 2015

How to Cite: Furic, M., Elain, A., Blel, W. & Sire, O. (2015). Regeneration of Lyes for Cleaning-In-Place (CIP) Processes in Dairies: Comparison of Recycled Potash and Soda Solutions Cleaning Properties. American Journal of Applied Sciences, 12(5), 329-334. https://doi.org/10.3844/ajassp.2015.329.334

Abstract

The regeneration of lyes for their integration in the dairy CIP was investigated applying an original process combining adsorption/coagulation and flocculation operations. Solutions of potassium hydroxide (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 the regenerated solutions was found to modify their physicochemical characteristics that are an increase of the turbidity, total Chemical Oxygen Demand (CODt) and Total Nitrogen (TN) content simultaneously with a decrease of surface tension (γ) and equilibrium contact angle (θe). Along regeneration cycles, potash solutions exhibit quite a distinct trend from soda, especially a lower TN increase and a faster reduction of γ leading to a significant lower value of the critical micelle concentration (32 Vs. 36 mN.m-1). These alterations can be correlated with the accumulation of surfactant molecules in the cleaning solutions derived from the saponification of fatty acids and the degradation of amino acids that can originate an improvement of the cleaning efficiency when re-used in CIP process.

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Keywords

  • Dairy Plant
  • Cleaning-In-Place
  • Caustic Soda
  • Potash
  • Physicochemical Regeneration Process