Hydrodynamic Cavitation As A Low-cost AOP
For Wastewater Treatment: Preliminary Results
And A New Design Approach
Author(s)
Y. Benito, S. Arrojo, G. Hauke & P. Vidal
Abstract
The phenomenon of Cavitation gives rise to a number of interesting physicalchemical
effects which can be employed to isolate and oxidize contaminants in
water. The micro bubbles generated by pressure pulses inside a liquid act as
small reactors, reaching extreme P-T conditions during short periods of time and
generating highly oxidant radicals such as OH·. This chemical behaviour is
analogous to that of Advanced Oxidation Processes (AOPs). While cavitation
generated by ultrasound has proven efficient, reliable and easy to optimise,
hydrodynamic cavitation should be studied as a valuable alternative. Although it
implies a number of disadvantages in terms of experimental procedures and
flexibility, its performance at industrial scales is better. This paper reports the
potential of hydrodynamic cavitation as an AOP for wastewater treatment,
showing its suitability and efficiency against a wide variety of contaminants
(biodegradable, recalcitrant, organic and inorganic) and concentrations, with
very low operation costs, simple equipments and no reactants required. The
objective is to summon the theoretical and experimental evidence of this
potential, constructing the computational tools and the experimental devices
which will be used to overcome the uncertainties and optimise the technique.
Keywords: wastewater treatment, hydrodynamic cavitation, acoustic cavitation, AOP.
1 Introduction
Cavitation consists of the generation, growth and subsequent collapse of gas
filled cavities (bubbles) due to pressure pulses inside a liquid bulk [1]. Bubbles
Keywords
wastewater treatment, hydrodynamic cavitation, acoustic cavitation, AOP.
Related Book
Other papers in this volume
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