Abstract
The study analyzed the physical-chemical and microbiological parameters carried out by the Autonomous Water and Sewage Service (AWSS) of the Municipality of Alvorada D’Oeste, Rondônia, Brazil. The parameters analyzed were: pH, turbidity, free residual chlorine, total coliforms (TC), thermotolerant coliforms (TTC) and heterotrophic bacteria. The values of hydrogen potential (pH) were obtained with a digital pH meter. The analyzes were carried out the 2013 to 2019. The turbidity and free residual chlorine values were obtained according to the method of the Practical Manual of Water Analysis of the National Health Foundation (FUNASA). To determine the microbiological parameters, PetrifilmTM plates (3MTM do Brasil Ltda) were used, following the manufacturer's guidelines. The analyzed values were compared with reference values described in Consolidation Ordinance nº. 5, of September 28, 2017, of the Ministry of Health (MS) which sets the standards for potability of water intended for human consumption. The results varied for all parameters evaluated: pH (3.11 to 8.24), turbidez (0.02 to 3,01), TC (0 to 100%), TTC (0 to 100%) and heterotrophic bacteria (85 to 100%). The values obtained for free residual chlorine were the only parameter to follow the reference values. The highest contamination for TC and heterotrophic bacteria were reported in 2019, higher the limits established in Brazilian legislation. Thus, the water was characterized as unfit for consumption and requires severe control for TC and heterotrophic bacteria.
Highlights
Water is a fundamental and indispensable component of human survival (Wolkmer, 2012)
In water treatment plants (WTPs), microorganisms can become resistant to disinfectant actions when present for long periods (Tenório, 2016; Silva et al, 2019)
The present study aimed to evaluate the results of the physical-chemical and microbiological analyzes carried out by the water treatment plant (WTP) in the municipality of Alvorada D'Oeste, Rondônia, Brazil, between the years 2013 to 2019, comparing with the reference values described in Consolidation Ordinance no. 5, of September 28, 2017, of the Ministry of Health (MS) which sets the standards for potability of water intended for human consumption
Summary
Water is a fundamental and indispensable component of human survival (Wolkmer, 2012). 5 of September 28, 2017, reports that water destined for human consumption by a water supply system must meet the potability standards following physical and biological prerequisites (Brasil, 2017). The percolation of rainwater and runoff can alter the quality of surface and underground water by the procedure of leaching of microorganisms from the process of disordered occupation of hydrographic basins (Moura et al, 2010). Water does not provide the necessary conditions for the multiplication of microorganisms, they can remain in the fluid long enough to guarantee their transmission (Reis et al, 2020). In water treatment plants (WTPs), microorganisms can become resistant to disinfectant actions when present for long periods (Tenório, 2016; Silva et al, 2019)
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