Ozonation and peroxidation of sanitary effluent from constructed westlands and anaerobic baffled reactor/aerobic aiming reuse

Author(s)

Nathalie Dyane Miranda

• Document type: Master's Dissertation
• Press: Bauru. 2015-03-03.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Bauru
• Defense date: 2014-07-02
• Advisor: Gustavo Henrique Ribeiro da Silva

Abstract

This research was aimed to study the disinfection of wastewater from treatment by a new configuration of an anaerobic/aerobic baffled reactor and by constructed wetlands, using ozone and peroxone. Were avaluated how these processes acted in the oxidation and inactivation of total coliforms and Eschechia coli, comparing their efficiency and formation of formaldehyde, which is the main aldehyde formed during the application of ozone and peroxone for disinfection. The formation of frmaldehyde was strongly depend on the dose of ozone, by a longer contact time also favored an increased in the formation of formaldehyde, even not significant according to the statistical tests applied. Peroxidation tests with a dose of 5 mg O3L-1 promoted a higher average formation of formaldehyde than when applying only just the same dose of ozone. For doses of 8 and 10 mg O3L-1, the formation of formaldehyde was generally smaller than when applied just the same dose of ozone. I.e., higher ozone doses during peroxidation favored a lower formaldehyde concentration in the final effluent. All tests ozonation and peroxidation promoted formaldehyde concentrations that were within the limit imposed by WHO (drinking water). For both the effluent from the C.W. as the anaerobic/aerobic baffled reactor, higher ozone doses or a longer contact time did not favor a significantly higher inactivation. Inactivation of Escherichia coli in effluent from the anaerobic/aerobic baffled reactor was no better when added hydrogen peroxide. The inactivation of total coliforms was higher in most of the tests when applied just ozone, and the consumption of ozone during peroxidation was lower than in ozonation tests. This way, is possible to conclude that the addition of hydrogen peroxide was favorable to the inactivation of total coliforms. For the effluent from the anerobic/aerobic baffled reactor only with the application of ozone was required a dose of 8 mg O3 L-1 for the effluent... (AU)

• FAPESP's process: 12/05297-9 - Disinfection of sanitary effluent from a new anaerobic/aerobic baffled reactor configuration using ozone and ozone/hydrogen peroxide
• Grantee: Nathalie Dyane Miranda Slompo
• Support Opportunities: Scholarships in Brazil - Master