ÁGUAS DE RETROLAVAGEM DOS FILTROS DE ETAs: UMA REVISÃO SOBRE POSSÍVEIS RISCOS ASSOCIADOS À RECIRCULAÇÃO DA ÁGUA

Abstract

The quality of water in water resources has been decreasing due to the increasing impacts of human actions on the environment. Thus, to achieve potability standards making it appropriate for human consumption, treatment methods and techniques are necessary. The recirculation of backwashing water from the filters of water treatment plants (WTPs) has become a common practice in most of these stations, due to water unavailability in some regions, allowing the return of the water used for the process. However, the use of backwashing water has shown changes in the quality of the water arriving at the stations due to high concentrations of organic compounds, microorganisms and metals, hindering the treatment processes and putting at risk the potability of the water that will be distributed to the community. This literature review work analyzed researches throughtout the world that evaluate the quality of the water that returns to the beginning of the treatment inside the WTPs and what are the risks that this process represents.