Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

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Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

Carvalho, MCS; Borges, AC; Pereira, MDS; Heleno, FF; Faroni, LRD; Campos, LC; (2018) Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater. Revista Ambiente e Agua , 13 (2) , Article 2078. 10.4136/ambi-agua.2078. Green open access

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Abstract

This work investigated the degradation of organic matter present in synthetic dairy wastewater by the combination of ozonation (ozone (O 3 )/hydrogen peroxide (H 2 O 2 )) and catalytic ozonation (ozone (O 3 )/manganese (Mn 2+ )) associated with dispersed air flotation process. The effect of independent factors such as O 3 concentration, pH and H 2 O 2 and Mn 2+ concentration was evaluated. For the flotation/O 3 /H 2 O 2 treatment, the significant variables (p ≤ 0.05) were: O 3 concentration (linear and quadratic effect), H 2 O 2 concentration linear and quadratic effect, pH values (linear and quadratic effect) and interaction O3 concentration versus pH. For catalytic ozonation, it was observed that the significant variable was the linear effect of O 3 concentration. According to the desirability function, it was concluded that the optimal condition for the treatment of flotation/O 3 /H 2 O 2 can be obtained in acidic solution using O3 concentrations greater than 42.9 mg L -1 combined with higher concentrations of H 2 O 2 to 1071.5 mg L -1 . On other hand, at pH values higher than 9.0, the addition of O3 may be neglected when using higher concentrations than 1071.5 mg L -1 of H 2 O 2 . For flotation/ozonation catalyzed by Mn 2+ , it was observed that metal addition did not affect treatment, resulting in an optimum condition: 53.8 mg L -1 of O 3 and pH 3.6.

Type:	Article
Title:	Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater
Open access status:	An open access version is available from UCL Discovery
DOI:	10.4136/ambi-agua.2078
Publisher version:	http://dx.doi.org/10.4136/ambi-agua.2078
Language:	English
Additional information:	This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords:	advanced oxidation processes; catalytic ozonation; physico-chemical treatment
UCL classification:	UCL 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/10048150