Effect of a new regeneration process by adsorption-coagulation and flocculation on the physicochemical properties and the detergent efficiency of regenerated cleaning solutions

Journal of Environmental Management
Walid BlelOlivier Sire

Abstract

Reprocessing soiled cleaning-in-place (CIP) solutions has large economic and environmental costs, and it would be cheaper and greener to recycle them. In food industries, recycling of CIP solutions requires a suitable green process engineered to take into account the extreme physicochemical conditions of cleaning while not altering the process efficiency. To this end, an innovative treatment process combining adsorption-coagulation with flocculation was tested on multiple recycling of acid and basic cleaning solutions. In-depth analysis of time-course evolutions was carried out in the physicochemical properties (concentration, surface tension, viscosity, COD, total nitrogen) of these solutions over the course of successive regenerations. Cleaning and disinfection efficiencies were assessed based on both microbiological analyses and organic matter detachment and solubilization from fouled stainless steel surfaces. Microbiological analyses using a resistant bacterial strain (Bacillus subtilis spores) highlighted that solutions regenerated up to 20 times maintained the same bactericidal efficiency as de novo NaOH solutions. The cleanability of stainless steel surfaces showed that regenerated solutions allow better surface wettabil...Continue Reading

References

Jun 20, 2001·Journal of Applied Microbiology·C FailleT Bénézech
Jun 2, 2005·Journal of Colloid and Interface Science·Hideo AkisadaAtsuko Yamada
Aug 13, 2010·Nihon Hoshasen Gijutsu Gakkai zasshi·Syuichi Nobuta
Jan 26, 2012·Frontiers in Microbiology·Daniela M GuglielmottiAndrea Del L Quiberoni
Jan 29, 2013·Journal of Colloid and Interface Science·Fabrice SallesHenri Van Damme

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