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.
|Titolo:||A full-scale plug-flow reactor for biological sludge ozonation|
GARDONI, DAVIDE (Primo)
|Parole Chiave:||full scale; minimisation; oxygen uptake rate; ozone; plug-flow; sludge|
|Settore Scientifico Disciplinare:||Settore ICAR/03 - Ingegneria Sanitaria-Ambientale|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||10.2166/wst.2014.432|
|Appare nelle tipologie:||01 - Articolo su periodico|