Monitoramento da qualidade da água tratada estocada nos reservatórios do sistema de abastecimento de água do DMAE pela análise do decaimento do cloro residual

Abstract

This Course Conclusion Paper presents a case study on the subject of monitoring the quality of treated water stored in the reservoirs of the DMAE water supply system, through the analysis of the decay of residual chlorine. The disinfection treatment process using chlorine is the most used by sanitation service providers, as it inhibits the action of disease-causing pathogenic organisms, in addition to having a low cost when compared to other disinfection processes. Chlorine added to water hydrolyzes into hypochlorous acid and hypochlorite ion, known as free chlorine. Uberlândia's DMAE water supply system stores treated water in reservoirs before it is sent to the consumer. Necessary to the need of constant supply, this water can change in its quality, mainly in the chlorine concentration, causing its decay, compromising its quality. With an analysis of the free residual chlorine in the reservoirs that ETA Bom Jardim supplies, it was possible to determine that the concentration of the disinfectant meets the GM / MS Ordinance No. 888/2021, with a minimum allowed value, 0.2 mg / L and the maximum of 2.0 mg / L. The pH values are also within what the ordinance recommends and that the temperature, being constant, does not interfere in the decay process. The distance from the ETA reservoirs was an important point observed, as it influences the decay, as well as the pipeline.