Banca de DEFESA: BIANCA MICAELA MACARIO GONÇALVES ACIOLI

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : BIANCA MICAELA MACARIO GONÇALVES ACIOLI
DATE: 26/07/2024
TIME: 14:00
LOCAL: Em ambiente virtual (Google meet)
TITLE:

EVALUATION OF STEROL CONTAMINATION OF THE CAPIBARIBE RIVER IN A LOCATION WITH A SEWAGE TREATMENT PLANT

KEY WORDS:

Domestic sewage; sterols; particulate organic matter; Capibaribe River, thermotolerant coliforms; GC/MS.

PAGES: 80
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Analítica
SPECIALTY: Análise de Traços e Química Ambiental
SUMMARY:

Water contamination caused by anthropogenic actions generates socio-economic and health problems, directly affecting the quality and availability of water. In Brazil, only 56% of the population has access to an adequate sewage treatment system, reflecting the significant deficiencies in basic sanitation. Microbiological assessments and analysis using biomarkers such as sterols can estimate the level of contamination in an environmental system. This study investigated the impact of anthropogenic actions on the contamination by domestic sewage of a stretch of the Capibaribe River in Recife/PE, associated with a sewage treatment plant (STP) and the period during which it was under maintenance, based on the quantification of sterols by GC/MS. The analytical workflow included the collection of 1 liter of 12 surface water samples from the Capibaribe River, the removal of particulate organic matter (POM), the analysis of total and thermotolerant coliforms, and the identification and quantification of sterols. The validation of the method followed ANVISA and INMETRO guidelines, meeting the figures of merit of linearity, LD, LQ, and instrumental precision. The process was validated by ANVISA and INMETRO guidelines, meeting the standards of linearity, LD, LQ, and instrumental precision. According to CONAMA legislation, the concentration of thermotolerant coliforms was above the ideal for a class 2 water source due to the deposition of fecal microbiological agents. This study quantified coprostanol, the principal fecal indicator, in all the samples, revealing that the site associated with the presence of the WWTP had relative values of 73%. The diagnostic ratios applied helped to identify the possible sources of this contaminant. Statistical analyses, such as Pearson Correlation (PCC) and Principal Component Analysis (PCA), were used to investigate the correlations between sterols and potential sources. Thus, this study contributes to the environmental monitoring of the region and can support the adoption of measures for the recovery of the Capibaribe River in the central area of Recife.

COMMITTEE MEMBERS:
Presidente - JANDYSON MACHADO SANTOS
Interno - RAMOM RACHIDE NUNES
Externa à Instituição - LAIS ARAUJO SOUZA - UFPE