The reduction of biological excess sludge production using ozone is a well-known technology and is applied in several full-scale plants around the world. Nevertheless, optimisation of the process is not yet adequately documented in the literature. Operational parameters are usually chosen by assuming a direct proportionality between ozone dose and excess sludge reduction. This paper investigates the role of ozone concentration on process efficiency and demonstrates the (non-linear) inverse relationship between ozone dose and specific particulate chemical oxygen demand solubilisation in plug-flow contact reactors. The influence of total suspended solids concentration is also studied and described. No short-term lethal effects on heterotrophic biomass have been observed.

A full-scale plug-flow reactor for biological sludge ozonation / D. Gardoni, E. Ficara, P. Vergine, R. Canziani. - In: WATER SCIENCE AND TECHNOLOGY. - ISSN 0273-1223. - 71:4(2015), pp. 560-565. [10.2166/wst.2014.432]

A full-scale plug-flow reactor for biological sludge ozonation

D. Gardoni
Primo
;
2015

Abstract

The reduction of biological excess sludge production using ozone is a well-known technology and is applied in several full-scale plants around the world. Nevertheless, optimisation of the process is not yet adequately documented in the literature. Operational parameters are usually chosen by assuming a direct proportionality between ozone dose and excess sludge reduction. This paper investigates the role of ozone concentration on process efficiency and demonstrates the (non-linear) inverse relationship between ozone dose and specific particulate chemical oxygen demand solubilisation in plug-flow contact reactors. The influence of total suspended solids concentration is also studied and described. No short-term lethal effects on heterotrophic biomass have been observed.
full scale; minimisation; oxygen uptake rate; ozone; plug-flow; sludge
Settore ICAR/03 - Ingegneria Sanitaria-Ambientale
2015
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/272810
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