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rez6db_544014.pdf

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U.P.B. Sci. Bull., Series D, Vol. 77, Iss. 1, 2015 ISSN 1454-2358

APPLICATION OF A NOVEL HYDRODYNAMIC CAVITATION SYSTEM IN WASTEWATER TREATMENT PLANTS

Michela LANGONE1, Roberta FERRENTINO2, Gabriella TROMBINO3, Daan WAUBERT DE PUISEAU4, Gianni ANDREOTTOLA5, Elena Cristina RADA6, Marco RAGAZZI7

In the present work, a novel hydrodynamic cavitation system has been used for the treatment of activated sludge, in order to evaluate the solubilisation of matter, the biodegradability improvement, and the effects on microbial activity. Experiments performed in this study indicate that solubilisation of chemical oxygen demand (COD) increased with specific supplied energy applied. For specific energy input of 1,250 kJ/kg of total solids, the microbial activity of the aerobic and anaerobic bacteria investigated was preserved, while specific energy input of 2,500 kJ/kg of total solids damaged the bacterial cells. Based on the results, in this paper different fields of applications of the novel hydrodynamic cavitation system in wastewater treatment schemes are suggested.

Keywords: Hydrodynamic cavitation, biodegradability, microbial cell disruption, solubilisation,

1. Introduction

Cavitation is generally defined as the phenomenon of generation, growth and subsequent collapse of microbubbles or cavities, resulting in very high local energy densities. When it occurs in a reactor, generates conditions of very high temperature (500-15000 K) and pressures (100 – 5000 atmospheres) locally, but the overall environment remains at the atmospheric conditions [1]. Due to its effects, cavitation has been studied for improvement of wastewater treatment process. Cavitation involves the dissociation of vapour trapped in the cavitating bubbles, resulting in the generation of free radicals which enhance chemical reactions [2]. Further, cavitation results in the generation of local turbulence and liquid micro-circulation in the reactor, increasing the rates of transport processes and, in addition, removing the mass transfer resistances in heterogeneous system

1 Post Doc, Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy 2 PhD student, Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy

3 PhD, Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy

4 Eng, Econovation, Germany

5 Prof., Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy 6 senior assistant researcher, Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy

7 Prof., Department of Civil Environ. and Mechanical Engineering, University of Trento, Italy

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