Banca de DEFESA: ANNE ELIZABETH DOS SANTOS CORREIA

Quantitative and qualitative analysis of the surface waters of the Riacho Doce/AL Watershed for the assessment of pollution loads

Water quality. monitoring. Sanitary sewage.

The discharge of untreated sewage into water bodies is a problem that directly impacts the quality of water resources in a region. In a scenario where water availability for human consumption is increasingly compromised, efficient public policies for water conservation and the adoption of measures that mitigate the degradation of rivers, seas and lakes are needed. In this sense, the objective of this work is to carry out an analysis of the quantitative (flow) and qualitative (physical, chemical and biological variables) of the surface waters of the Riacho Doce/AL Watershed from the monitoring of water quality. The methodology will start with the delimitation of the area, the determination of a water quality monitoring plan and flow measurements to obtain the pollutant load, with monthly collections from March to December 2022, in the dry and rainy seasons, determination of the IQA from the water quality variables, and the comparison with the legislation in force. In addition, a point upstream and downstream of Sanama's sewage treatment plant will be selected, given the raw and treated effluent that will be made available by the company. Along the Riacho Doce to Foz, on-site measurements will be carried out at four points with the HORIBA U53 probe that determines: pH, water temperature, ORP, conductivity, turbidity, OD and salinity. A sample of water for each point will be stored so that, later, the quality variables are obtained from the use of laboratory methodologies, they are: BOD5, total coliforms, total ammoniacal nitrogen and phosphorus (phosphate). The flow measurement will be based on the use of the windlass, in order to calculate the pollutant load. Finally, the evaluation and/or identification of possible diffuse and point sources of pollution will take place by aerial mapping with the use of drone.