Análise físico-química da qualidade das águas pluviais: estudo de caso - Instituto de Aplicação Fernando Rodrigues da Silveira , Rio Comprido RJ.

Abstract

Society has demanded increasing amounts of various natural elements, mainly water. Because fresh water occurs in relatively small amounts on the planet (3%), the water available for human consumption are the most impacted by anthropic action. The degradation of these resources occurs by factors such as pollution, waste and lack of public policies on conservation of water resources. In order to implement strategies for better management of water resources, the use of rainwater as an alternative water source became important. Besides a water source easily accessible in many regions (with mean annual rainfall 1589 mm in the Tijuca area Alerta Rio, 2013), studies show that their quality allows their use in non-potable activities, resulting in water savings that are treated and intended to human consumption. Aiming to collaborate with the issues previously exposed, this dissertation sought to evaluate the quality of rainwater in a particular region and factors that might interfere in the quality of the rainwater, as the type of the material on the uptake surface, proximity to air pollution sources and drought period preceding the rainfall event. For this task, it was installed a system of rainwater harvesting at the Institute Fernando Rodrigues da Silveira, where CAp UERJ, located in municipally Rio Comprido, northern of Rio de Janeiro. The physico-chemical parameters: pH water, turbidity, temperature, dissolved oxygen, total dissolved solids, oxi-reduction potential and conductivity were analyzed with the aid of water quality multiparameter probe. By correlating the presence of solids in rainwater with drought periods, it was found that the longer the dry period, greater is the amount of solids in the samples. Except foi pH, all parameters (physical-chemical) met, regulatory limits (Decree 2914/11, MS; Standards of potability). It is recommended that further investigation is developed in order to better intently factors interfering with water acidification found in this study.