Research Article
Oxidation process by ozonization aplied in post-treatment of pulp and paper industry wastewaters
Cristiane Lisboa Giroletti1, Jean Carlo Salomé dos Santos Menezes2, Beatriz Lima Santos Klienchen Dalari1, Andrei Goldbach2 and Maria Eliza Nagel-Hassemer1
1Federal University of Santa Catarina. Campus Universitário, Trindade. 88040-970, Florianópolis, Santa Catarina, Brasil.
2University of the West of Santa Catarina. Rua Paese, 198. 89.560-000, Videira, Santa Catarina, Brasil.
Submitted: April 29, 2018; Revised: July 21, 2018; Accepted: July 25, 2018
Abstract
Restrictions imposed by environmental legislation, the water crisis and economic challenges are all factors that have recently contributed to the proliferation and application of advanced oxidation processes as an alternative method of wastewater treatment. The purpose of this study was to assess the use of ozone in the post-treatment of a pulp and paper mill's wastewater, already treated using an activated sludge biological process. The ozonation process yielded high levels of oxidation of organic substances, corroborated by an almost immediate reduction in COD and BOD5 loads. By the end of the treatment, the wastewater's biodegradability had increased by 70%. Color removal percentages ranged from 52% to 91%. In terms of turbidity, the removal rate attained a 78% level. Total solids removal reached a 63% level. These results are evidence of the effectiveness of the ozonation process in the post-treatment of biologically treated wastewater generated by pulp and paper mills.
Keywords
Advanced Oxidation Process; Ozone; Industrial Wastewater; Pulp and Paper.
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