Garantia da qualidade de água de abastecimento em Fortaleza, Caucaia e Maracanaú – aplicação de índice de conformidade e de concordância fuzzy

Abstract

On water supply systems, water quality control practices are extremely important in order to monitor the potability patterns in accordance to the valid local laws. The main objective of treating water is to adequate its characteristics to human consumption and to reduce the impurity load of it. This paper used the Law number 2914/2011, by the Health Ministry, as a guide to the development of the study regarding the “Water supply quality guarantee in Fortaleza, Caucaia and Maracanau”, with respect to the following parameters: turbidity, apparent color, free residual chlorine, total coliform, Escherichia coli and heterotrophic bacteria. The guarantee of a water treatment plant is its probability of producing effluent water with the required characteristics according to the normative patterns (i.e., abiding by the potability patterns) in a determined period. In this research, two auxiliary techniques were used, based on the Fuzzy Logic and Conformity Index, in order to verify both the produced and distributed treated water quality guarantee in Fortaleza, Caucaia and Maracanau – Ceara. The results of both techniques showed a reduction on the performance in all the systems concerning the analyzed parameters in 2016. The WTP Gaviao presented a satisfactory index in 2015, and Caucaia showed the best performance in general among the distribution network. The turbidity pattern considerably contributed to the reduction of the Conformity Indexes of each system. Monitoring techniques of easy manipulation such as the above-mentioned ones are useful to assist the decision making in the process, assigning better actions to improve the WTPs and the distribution systems when it is necessary.