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Evaluation of processes of removal and inactivation of Giardia spp., Cryptosporidium spp. and indicator microorganisms in blackwater previously treated sequentially by UASB reactor, photobioreactor and flotation

Grant number: 15/04594-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2015
Effective date (End): January 31, 2018
Field of knowledge:Engineering - Sanitary Engineering
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Luiz Antonio Daniel
Grantee:Nathalie Dyane Miranda Slompo
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The application of appropriate technologies for the wastewater treatment enables the recovery of energy and valuable products, such as nutrients (N, P, K). Faced with this possibility, many researchers advocate a paradigm shift, in order to improve the performance of wastewater treatment systems that should not be regarded as a pollutant, but, natural resources to be reused. This new concept of sanitation shows that separation of black water and grey water from other types of waste at the source of generation, can facilitate the recovery of nutrients contained in these waters, because segregation and treatment of different effluents according to their chemical characteristics makes the process more efficient. The black water contains about half of the organic material in the wastewater load and can be taken with a small amount of water using, for example, vacuum toilets. Black water also contains most of the pathogens, hormones, and pharmaceutical residues. The anaerobic treatment is considered as the main technology for the recovery of energy and nutrients from black water, because it generates methane from organic matter by the action of a consortium of anaerobic microorganisms, while producing low amounts of sludge. The nutrients are, in mostly, solubilized and can be recovered with physico-chemical methods such as precipitation, or biological removal, for example, fixing of nitrogen and phosphorus by microalgae in photosynthetic reactions. However, the wastewater treatment processes used for removal of carbon, nitrogen or phosphorus, contribute little to the removal and inactivation of pathogenic microorganisms or parasites, because the environmental conditions are favorable on keeping them infectious.. The disinfection procedures commonly used include ultraviolet (UV) radiation, chlorine, ozone, peracetic acid, chlorine dioxide and processes combined UV-H2O2, UV-ozone, ozone and H2O2. However, the effectiveness of these methods of disinfection is related to the quality of water or the treated wastewater mainly with respect to disinfectant demand promoted by organic matter and total suspended solids that protect pathogenic microorganisms. The wastewater treatment processes can be combined to increase the efficiency of removal of organic matter and suspended solids. In the research proposed here, it is provided the combination of anaerobic process followed by photobioreactor for nitrogen and phosphorus removal and solids removal by dissolved air flotation and also mixed with ozone (ozone-flotation) and disinfection of effluent. Thus, it aims to evaluate the removal and inactivation of indicator microorganisms, cysts of Giardia spp. and oocysts of Cryptosporidium spp., analyze the effects of individual disinfectants (chlorine, ozone, and ultraviolet radiation) and sequential disinfectants (chlorine-ultraviolet radiation, ozone-ultraviolet radiation, ozone-hydrogen peroxide and ozone-chlorine) in the indicator microorganisms and Giardia spp. and Cryptosporidium spp., compare their resistance to disinfectants and verify the occurrence of synergism in the sequential disinfection. (AU)

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SLOMPO, Nathalie Dyane Miranda. Monitoring and evaluation of treatment system for wastewater composed of UASB reactor, photobioreactor, flotation and disinfection processes. 2018. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos São Carlos.

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