Reuso de água cinza escura tratada através de um sistema de alagado construído (SAC) utilizando como substratos resíduos da construção civil.

Abstract

The current water crisis has led society to change its habits of use of water resources and the reuse of water becomes an alternative to this crisis. The constructed wetlands are low in cost of operation and maintenance and can make water reuse possible, as well as having a great efficiency in the removal of impurities in the water. The objective of this work was to evaluate the efficiency of a vertical constructed wetland using as substrates waste from the civil construction and ornamental plant, in the treatment of dark gray water from kitchen sinks, as well as directing the treated water to the non-potable reuse appropriate. Dark gray water was collected in the snack bar of the Federal University of Campina Grande Pombal campus, from May to June 2017, and inserted into the system. The system was built in a plastic container of 20L and formed by layers of debris from construction materials. Physical-chemical and microbiological parameters of raw gray water and post-treatment water were analyzed to verify the efficiency of the system. Some parameters had a reduction greater than 80% that was the case of turbidity and total coliforms, and above 90% being this for sedimentable solids. For reuse, it was verified that the treated water could be reused in the washing of vehicles and sidewalks, irrigation of gardens, reuse in fodder and pasture for livestock. It is hoped that this study will allow the use of constructed wetlands on a large scale for greater water availability.