Banca de DEFESA: HELENICE FERREIRA FILGUEIRAS
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : HELENICE FERREIRA FILGUEIRAS
DATE: 16/10/2023
TIME: 08:30
LOCAL: SALA VIRTUAL: meet.google.com/yii-iemk-fgu
TITLE:
ANALYSIS OF NATURAL AND MAN-MADE EFFECTS ON WATER QUALITY IN THE NIQUIM RIVER BASIN
KEY WORDS:
Water quality; Land use and occupation; Water availability; Niquim River, Framework
PAGES: 112
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Recursos Hídricos
SPECIALTY: Planejamento Integrado dos Recursos Hídricos
SUMMARY:
Considering that the knowledge of the variables that influence water quality and availability helps the management and better use of water resources, and that land use and occupation in watersheds is directly and indirectly related to the quality and quantity of water in rivers, this study sought to analyze the natural and anthropogenic effects on the water quality of the Niquim River, located in the São Miguel Hydrographic Region. The study was divided into seven stages: I. Theoretical foundation; II. Diagnosis of land use and occupation and water resources; III. Planning of activities; IV. Survey of cadastral data of water uses; V. Mapping of the basin; VI. Technical studies; VII. Evaluation and presentation of the prognosis, divided into analysis of land use and occupation, quantitative and qualitative analysis of water, and proposal of framework. The qualitative and quantitative monitoring of the water was conducted at three collection points, the first point located at Lagoa Niquim (RNL), the second point located near the CASAL Station (RNEC), and the third point located near the mouth (RNF), with monthly collections from July to December 2022. For each sample collected, physical, chemical and microbiological analyzes were performed, totaling 19 parameters. The results found were submitted to descriptive statistics and statistical tests. In the analysis of land use and occupation, the basin was divided into areas of contributions, to associate land use and occupation and the results of water quality at the monitoring points. In the three areas of contribution there is a predominance of sugarcane areas, this explains the organic load possibly related to plant or animal organic matter, and in the last point there is a contribution of the expanding urban area, evidenced by the non-conformity of the parameters of BOD5.20, total coliforms, and E. coli. In the qualitative analysis, about seasonality, the COD of the RNEC point was the only parameter that showed significant variations between the rainy and dry periods. Spatially, turbidity, conductivity, total alkalinity, and E. coli showed significant variations along the river, between the collection points, in the dry period. In temporality, the analysis made with primary and secondary data corresponding to the period 2005-2022, chloride and E. coli showed significant reductions over the years. In the qualitative-quantitative analysis of the water, the correlation between the water parameters and the flow rate showed a strong correlation for the parameters of DO, total coliforms and E. coli, at the RNEC point and salinity, BOD5.20, total coliforms, at the point near the mouth (RNF). Regarding the behavior of water quality parameters with the variation of the flow rate, it was identified throughout the monitoring period that at the RNEC point, the DO showed an inverse variation to the behavior of the flow rate, decreasing with the increase of the flow rate and increasing with the reduction of the flow rate, at the RNF point, the BOD5,20 showed behavior similar to the variation of the flow rate. The results of the analyzes were compared with the limits established by CONAMA Resolution No. 357/05. It was found that in some stretches their quality and their framework do not meet their preponderant uses. In the framework proposal, all stretches are framed in class 1, for this, in stretch 1, it seeks to increase the OD, and reduce the BOD5.20 and ammoniacal nitrogen, through the preservation of forest formations to reduce the organic load in this stretch. In section 2, the aim is to reduce the parameters through the preservation of vegetated areas, mainly riparian forest, to reduce the organic load in this section. In section 3, the parameters BOD5,20, ammoniacal nitrogen, DO and E. coli are above that allowed by the Resolution, for this it is necessary the correct destination of effluents, preservation of green areas, planning of land uses and occupation.
COMMITTEE MEMBERS:
Presidente - 1121201 - NELIA HENRIQUES CALLADO
Interno(a) - 1640249 - MARLLUS GUSTAVO FERREIRA PASSOS DAS NEVES
Interno(a) - 1357436 - VLADIMIR CARAMORI BORGES DE SOUZA
Externo(a) à Instituição - FABIANA CARNAÚBA MEDEIROS