Effect of hydrodynamic cavitation on zooplankton: a tool for disinfection

TitleEffect of hydrodynamic cavitation on zooplankton: a tool for disinfection
Publication TypeJournal Article
Year of Publication2008
AuthorsSawant, SShivram, Anil, AChandrashe, Krishnamurthy, V, Gaonkar, C, Kolwalkar, J, Khandeparker, L, Desai, D, Mahulkar, AVinod, Ranade, VVinayak, Pandit, ABalchandra
JournalBiochemical Engineering Journal
Volume42
Issue3
Pagination320-328
Date PublishedDEC
Type of ArticleArticle
ISSN1369-703X
KeywordsCell disruption, heat transfer, Hydrodynamic cavitation, Modelling, Wastewater treatment, Zooplankton
Abstract

Application of hydrodynamic cavitation for disinfection of water is gaining momentum, as it provides environmentally and economically sound options. In this effort, the effect of cavitating conditions created by differential pump valve opening and that created by flowing through a cavitating element (orifice plates) on the microbes (zooplankton in sea water) is described. The experimental results are compared with modelling of cavitating conditions that includes cavity dynamics, turbulence generated by individual oscillating cavity, cell wall strength and geometrical and operating parameters of cavitation device. Theoretical model for quantifying the cavitationally generated turbulent shear and extent of microbial disinfection has been developed. Experimental results indicated that cavitation and/or turbulent fluid shear dominantly originating from cavitation are effective tools for sea water disinfection as more than 80% of the zooplankton present in the sea water were killed. It was also observed that shock waves generated due to cavitation is not the sole cause for zooplankton disruption. A correct physical mechanism accounting fluid turbulence and shear, generated from stable oscillation of cavity, significantly contribute towards the disruption. Further refinement of the model presented will serve as a basis for higher degree of disinfection and provide a practical tool for sea water disinfection. (C) 2008 Elsevier B.V. All rights reserved.

DOI10.1016/j.bej.2008.08.001
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)2.463
Divison category: 
Chemical Engineering & Process Development