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Disinfection of Sanitary Wastewater Treated by Anaerobic/Aerobic Baffled Reactor Using Ozone

Grant number: 12/23893-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2013
Effective date (End): December 31, 2013
Field of knowledge:Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
Principal researcher:Gustavo Henrique Ribeiro da Silva
Grantee:Gabriela de Paula Ribeiro
Home Institution: Faculdade de Engenharia (FE). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil

Abstract

The proper disposal of sanitary wastewater is critical to the maintenance of public health and the environment. Currently, in most municipalities, there are no systems for collecting and treating wastewater, but this situation should be changed, because of the risk of contamination of water sources used for public supply. Since the second half of the last century, there has been growing interest in the application of biological processes for wastewater treatment, especially stabilization ponds, activated sludge, aerobic reactors with biofilms and anaerobic reactors. The efficiency of the anaerobic treatment of wastewater, has proved limited, so has the need for new settings for existing processes. As the efficiency of aerobic treatment in itself also has some disadvantages To minimize these disadvantages and improve the advantages present in aerobic and anaerobic processes, the union of the biological systems of wastewater treatment is sought, i.e. the combination of anaerobic processes with aerobic processes. This work will use effluents of a new configuration of a anaerobic/aerobic baffled reactor. One of the main disadvantages of the biological processes and thus also the anaerobic/aerobic baffled reactors is the limitation in the removal of pathogenic organisms. Thus, complete disinfection is necessary to apply additional chemical methods, such as ozone. Ozone, that has emerged as a promising method for wastewater disinfection, needs to be further studied, as well as its potential in byproducts formation. This research aims to study the formation of the main byproduct formed in the ozonation (formaldehyde) of sanitary wastewater, to check the oxidation process using ozone, and also to analyze the efficiency of ozonation inactivation of microorganisms.

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