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

American Journal of Applied Sciences

Marie Furic¹  Walid Blel¹  Olivier Sire¹  Anne Elain¹ 

关键词: Dairy Plant;    Cleaning-In-Place;    Caustic Soda;    Potash;    Physicochemical Regeneration Process;   

DOI  :  10.3844/ajassp.2015.329.334

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

The regeneration of lyes for their integration in the dairyCIP was investigated applying an original process combining adsorption/coagulation and flocculation operations. Solutionsof potassium hydroxide (KOH) and caustic soda (NaOH) soiled with 1% (v/v) ofwhole milk were submitted up to twenty successive regeneration cycles. Themultiple recycling of the regenerated solutions was found to modify theirphysicochemical characteristics that are an increase of the turbidity, totalChemical Oxygen Demand (COD_t) and Total Nitrogen (TN) contentsimultaneously with a decrease of surface tension (γ) and equilibrium contact angle (θ_e). Along regeneration cycles,potash solutions exhibit quite a distinct trend from soda, especially a lowerTN increase and a faster reduction of γ leading to a significant lower value of the criticalmicelle concentration (32 Vs. 36 mN.m^-1). Thesealterations can be correlated with the accumulation of surfactant molecules inthe cleaning solutions derived from the saponification of fatty acids and thedegradation of amino acids that can originate an improvement of the cleaningefficiency when re-used in CIP process.

【 授权许可】

Unknown