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| Author(s): |
Lays Paulino Leonel
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Civil, Arquitetura e Urbanismo |
| Defense date: | 2022-03-15 |
| Examining board members: |
Adriano Luiz Tonetti;
Valeria Maia de Oliveira;
José Roberto Guimarães;
Andre Bezerra dos Santos;
Maria Ines Zanoli Sato
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| Advisor: | Adriano Luiz Tonetti |
| Abstract | |
The major consumer of available water on Earth is agriculture, it is estimated that 70% of its global use is destined for this activity. In this way, the wastewater reuse appears as a viable alternative to supply the demand of the agricultural sector, however, one of the difficulties encountered to enable safe reuse is to determine an efficient disinfection system for the inactivation of Giardia lamblia cysts. This protozoan is the most identified pathogen in stool exams around the world. Thus, the present study aims to evaluate the impacts caused by the agricultural reuse of treated and disinfected domestic wastewater, at a level considered safe about the presence of Giardia cysts, on the physicochemical and microbiological properties of the soil and on crop yield. For this, firstly, the performance of different dosages of the chosen disinfecting agents (chlorine, peracetic acid, ultraviolet radiation, and association between hydrogen peroxide and ultraviolet radiation) was evaluated, for the inactivation of Giardia cysts in wastewater samples. Then, to evaluate the effects of the use of disinfected wastewater on the soil, an experiment was carried out in a greenhouse, in which a wheat crop was irrigated with wastewater treated with the dosages of disinfectants that presented the best cyst inactivation performance. Irrigation with non-disinfected effluent and tap water were used as controls. At the end of a wheat crop cycle, pH, electrical conductivity, organic matter, nitrogen and phosphorus concentration, and soil microbial composition were evaluated, as well as the number of wheat grains produced by plants irrigated with the different treatments. Disinfection treatments did not impact soil physicochemical characteristics or wheat yield, but played an important role in microbial community structure (AU) | |
| FAPESP's process: | 17/12157-2 - Impact of the application of treated and disinfected wastewater to inactivation of Giardia spp. in soil properties |
| Grantee: | Lays Paulino Leonel |
| Support Opportunities: | Scholarships in Brazil - Doctorate |