Banca de DEFESA: MARIA CECÍLIA PAIVA NÓBREGA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA CECÍLIA PAIVA NÓBREGA
DATE: 11/07/2023
TIME: 09:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Water Characteristics of Shallow Wells Along the Banks of the Capibaribe River in the Recife Lowlands

KEY WORDS:

Riverbank Filtration; Capibaribe River; Water treatment.

PAGES: 126
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The increase in consumption of chemical products, motivated by population growth and processes such as industrialization and urbanization, has generated great concern regarding the pollution of water bodies, as it causes a generation of effluents rich in various types of contaminants, some of which are difficult to remove. Such contaminants are present in water bodies due to improper disposal of solid waste and the low efficiency of conventional processes carried out by Water Treatment Plants, which may compromise the quality of the population's water supply and damage aquatic ecosystems. In this sense, it becomes increasingly necessary to use alternative treatment processes that are effective in removing different types of contaminants. Thus, Riverbank Filtration (RBF) appears as a natural, low- cost, and easy-to-use treatment technique. Based on this problem, the present study aimed to monitor the water quality of shallow wells and analyze the river-aquifer interaction in a stretch along the banks of the Capibaribe River, Metropolitan Region of Recife-PE, Brazil. Three sampling campaigns were carried out during December 2022, January 2023, and February 2023 at five different points along the Capibaribe River. To verify the quality of the shallow wells with the quality of the river water, physical, chemical, and bacteriological data were carried out on samples of surface water from the Capibaribe River and the shallow wells located along its margin. After analyzing the data, satisfactory results were obtained, as the samples from the shallow wells showed a significant improvement in comparison to the waters of the Capibaribe River for the vast majority of parameters. In addition, in samples from shallow wells, the parameters pH, nitrite, nitrate, chlorides, and total dissolved solids showed values within the range allowed by the Brazilian Potability Standard. Concerning chlorophyll a, there was a significant reduction in the samples from the wells, with total removal in 30% of the samples and presenting a reduction rate above 94.3% for all points analyzed. Dissolved oxygen levels increased between the river and well samples, which was not expected according to other research on the subject. Regarding the bacteriological analyses, there was a significant removal between the values found in the river and the shallow wells, showing a reduction of 96.6% and 99.9%. The influence of the distance between the wells and the river on the results obtained was not verified, requiring a deeper investigation and a longer period on this variable. Therefore, it is possible to conclude that the use of the RBF technique as a preliminary treatment of water along the banks of the Capibaribe River is possible, requiring only some care and additional processes, considering the high level of pollution found in the river.

COMMITTEE MEMBERS:
Presidente - 2726911 - ANDERSON LUIZ RIBEIRO DE PAIVA
Externa à Instituição - ANDREA SHIRLEY XAVIER DA SILVA
Externo à Instituição - RICARDO DE ARAGAO - UFCG