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Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Carvalho, MCS; Borges, AC; Pereira, MDS; Heleno, FF; Faroni, LRD; Campos, LC; (2018) Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes. Bioscience Journal , 34 (3) pp. 587-594. 10.14393/BJ-v34n3a2018-37009. Green open access

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Abstract

This study evaluated the adjustment of four kinetic models and their respective parameters on data of dairy wastewater treatment by the physico-chemical process of flotation and ozonation. The experiment was implemented during the year 2014, with all the tests in triplicate. The treatments were carried out at different pH levels (3.6, 7.0 and 10.4), and flotation/ozonation was catalyzed by manganese (Mn2+) in neutral level (pH 7.0). Best removal efficiencies for chemical oxygen demand (COD) were obtained in acidic medium, with removals greater than 75% after 20 min of treatment. There was no significant difference with regards to addition of Mn2+on COD removal by the physico-chemical process. The kinetic models that best fit to the experimental data, for all treatments, were the asymptotic (residual) model and that of Chan and Chu. Treatment in acidic medium showed the highest values of the kinetic parameters for the adjusted model, obtaining a k coefficient equal to 0.2394 min-1for the asymptotic model and kinetic coefficient 1/ρ of 0.4816 min-1for the Chan and Chu model, both presenting a determination coefficient greater than 99%.

Type: Article
Title: Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes
Open access status: An open access version is available from UCL Discovery
DOI: 10.14393/BJ-v34n3a2018-37009
Publisher version: https://doi.org/10.14393/BJ-v34n3a2018-37009
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Asymptotic model, Chan and Chu model, AOP
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10061570
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