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.
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Research Article| October 24 2014
A full-scale plug-flow reactor for biological sludge ozonation
Davide Gardoni, Elena Ficara, Pompilio Vergine, Roberto Canziani; A full-scale plug-flow reactor for biological sludge ozonation. Water Sci Technol 1 February 2015; 71 (4): 560–565. doi: https://doi.org/10.2166/wst.2014.432
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