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Rheological characterization of food industry wastewater
Autori: V. Giordano, V. Calabrò, B. de Cindio
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 2
Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English
Abstract
The design of wastewater treatment and transport is usually done by assuming newtonian behaviour to solve the often complex fluid dynamics governing the process, and correcting the results by means of empirical coefficients, especially when suspended particles become relevant. This design technique very often leads to badly working plants or to expensive over dimensioned pumping systems, but also to dangerous under dimensioned plant, that are not capable to work and to perform an efficient depuration performance [1].
This problem that is often encountered in wastewater treatment, becomes more crucial when treating wastewater of food industry, because in this case the fluids are very rich of suspended solids made by the organic residuals. These systems show a characteristic non-newtonian behaviour with a shear rate dependent viscosity.
In this work a rheological approach has been used in the particular case of oil mill wastewater that are very important for Calabria, being one of the greatest producer of olive oil. The technique has been applied to both filtered and not filtered wastewater, because sometime a gross filtering unit is present before the classic depurative treatment. The main aim was to find a better method to design such depurative system.
In the following this was applied to distributed frictional pressure drops, and the pumps power was evaluated for several flow rates both for laminar and turbulent flows.
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