Banca de DEFESA: Alef Luan de Souza Pereira

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Alef Luan de Souza Pereira
DATE: 06/10/2023
TIME: 14:00
LOCAL: Sala de Informática do PTARH com Transmissão pela Plataforma MS Teams
TITLE:

COMPARISON OF UPFLOW DIRECT FILTRATION AND DOWNFLOW DIRECT FILTRATION PERFORMANCE, WITH AN EMPHASIS ON THE REMOVAL OF AEROBIC SPORE-FORMING BACTERIA AND FLUORESCENT MICROSPHERES AS SURROGATES FOR Cryptosporidium OOCYST.

KEY WORDS:

Direct upward filtration, Direct downward filtration; Spores of aerobic bacteria; Cryptosporidium oocysts

PAGES: 88
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Tratamento de Águas de Abastecimento e Residuárias
SUMMARY:

The presence of Cryptosporidium oocysts in drinking water represents a potential risk for public health. However, due to the complexity and costs associated with the routine of quantification of these oocysts in water, monitoring its removal in water treatment plants (WTP) has been carried out using surrogates’ parameters, aiming to enable systematic analyses. Two of the surrogates already investigated and recognized by the scientific community are the aerobic spore-forming bacteria (ASFB) and fluorescent polystyrene microspheres. In this context, this study evaluates and compares the performance of upflow direct filtration (UF) and downflow direct filtration (DF), with an emphasis on the removal of ASFB as surrogate for the removal of Cryptosporidium oocysts. The methodology was divided into two stages: bench-scale tests - jar tests to draw the coagulation diagram and select the best pH conditions and coagulant dose (aluminum sulfate) - and pilot-scale filtration experiments. In the pilot filtration experiments, the removal of turbidity, apparent color, coliforms, ASFB and microspheres were evaluated, considering two operating conditions: (1) upflow and downflow filters operating with the same filtration rate (5 m/h) and upflow; (2) downflow filters operating with the same flow rate of 59.41 L/h (equivalent to the rate of 5 m/h in UF and 10.48 m/h in DF). In general, the downflow filter presented a slightly higher removal efficiency than the upflow filter. The average ASFB removal was 2.35 log and 2.33 log in the downflow filter, and 1,98 log and 1.60 log in the upflow filter, operating under condition 1 and condition 2, respectively. However, the differences in removal efficiency of DF and UF were not considered statistically significant in most cases. The removal efficiency of fluorescent microspheres was higher than those of ASFB in both filters and ranged from 3 to 5 log, corroborating that the removal of aerobic spore-forming bacteria (ASFB) is a conservative surrogate of the removal of microspheres and, consequently, of the removal of Cryptosporidium oocysts. Finally, the data revealed a weak correlation between EBA removal and other parameters, with the exception of total coliforms.

COMMITTEE MEMBERS:
Externo à Instituição - RAFAEL KOPSCHITZ XAVIER BASTOS
Interna - 1512988 - ARIUSKA KARLA BARBOSA AMORIM
Presidente - 1122604 - CRISTINA CELIA SILVEIRA BRANDAO
Interna - 1646057 - YOVANKA PEREZ GINORIS