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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Optimization of UV/H2O2 and ozone wastewater treatment by the experimental design methodology

Full text
Author(s):
Malvestiti, Jacqueline A. [1] ; Fagnani, Enelton [1] ; Simao, Debora [1] ; Dantas, Renato F. [1]
Total Authors: 4
Affiliation:
[1] Univ Campinas UNICAMP, Sch Technol, Paschoal Marmo 1888, BR-13484332 Limeira - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ENVIRONMENTAL TECHNOLOGY; v. 40, n. 15, p. 1910-1922, JUL 3 2019.
Web of Science Citations: 5
Abstract

The objective of this study was to optimize UV/H2O2 and ozonation systems by means of an experimental design using as a response the efficiency of the operational conditions to remove the methylene blue (MB) dye. Two classes of experimental planning were used: the Doehlert matrix (DM) and the central composite design (CCD). The most important variables for each process were hydrogen peroxide concentration, the ratio of illuminated volume/total volume of the reactor and recirculation flow rate for UV/H2O2, and ozone flow rate, consumed ozone and MB concentration for the ozonation. The DM was more efficient in optimizing the systems, since it used a smaller number of experiments and achieved similar results when compared to the CCD. After optimization, the disinfection efficiency of the systems was tested with secondary effluent evaluating the inactivation of microbiological indicators, Escherichia coli and total coliforms, using the optimized and the worst condition previously obtained with MB removal as response. The inactivation efficiencies in the optimum conditions were about 99%, allowing an efficient disinfection as well as the production of an effluent with quality to be reused according to specific legislations, while at the worse conditions, the inactivation did not reach standards for reuse. (AU)

FAPESP's process: 16/07911-7 - Disinfection of secondary effluents by UV/H2O2
Grantee:Jacqueline Aparecida Malvestiti
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 14/17774-1 - Influence of the secondary effluent composition on the disinfection by advanced oxidation processes
Grantee:Renato Falcão Dantas
Support Opportunities: Research Grants - Young Investigators Grants