Abstract
The water quality evaluation with reference to parameters of drinkability is made through a series of analyses, which are physicochemical or microbiological. This study aims to evaluate the physicochemical and microbiological parameters of drinking water distribution network in the western part of the Rio Grande do Norte, Brazil. Water samples were collected in several neighborhoods, and divided into 5 zones. In each of those five points two samples were collected: Water receiver of water distribution network and household water collector. In relation to the physical parameters, color and turbidity recorded higher results in the collectors of homes, and identified the lack of maintenance. For the studied microbial tests, the presence of coliform group bacteria was verified, being the major contamination in the receivers. This was justified by the lack of maintenance and prohibition of sealing of these collectors, allowing the access of rodents, insects and other carriers of microorganisms. Therefore, the water consumed at the collection points in the western zone of the RN / Brazil presents adequate physicochemical and microbiological indices in disagreement with the legislation that regulates water portability. Key words: Water quality, coliforms, microorganisms, portability, water supply.
Highlights
Water quality of public supplies, through chemical, physical and microbiological parameters, is an issue monitored by the government through regulatory agencies or consumers (Al-Mudhaf et al, 2009)
The composition of some chemical products used in the water treatment or its components which are naturally present in the water and their potential adverse health effects associated with long-term ingestion have been studied by Choi et al (2013); this drives to the importance of policies that regulate issues surrounding water portability parameters for human consumption
Samples were subjected to analysis according to the Standard Methods for the Examination of Water and Wastewater (Eaton et al, 2012). They were processed at the Veterinary Microbiology Laboratory and at Petroleum Engineering Laboratory; both belong to the Federal Rural University of the Semiarid
Summary
Water quality of public supplies, through chemical, physical and microbiological parameters, is an issue monitored by the government through regulatory agencies or consumers (Al-Mudhaf et al, 2009). In the assessment of water quality, a set of parameters must be considered as well as their maximum permissible values (MPV) in accordance with Brazilian legislation (Silva et al, 2014). Among these parameters, the physicochemical has fundamental importance because these characteristics can influence the water taste, color and odor, and produce harmful physiological effects (Blank and Vieira, 2014). According to the studies that portray the water quality for human consumption, the main physical and chemical parameters evaluated are pH, hardness, chloride, nitrate, alkalinity, color and turbidity, with standards established by Ordinance 2.914 / 2011 (Sousa et al, 2016; Lima et al, 2016; Fernandes and Scalize, 2015)
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