Potencial de reuso do efluente tratado por sistema wetland construído

Abstract

The present study had the goal of assessing the reuse potential of the effluent treated by a constructed wetland system. Specifically, the objectives were to return the research activities at the Station for Research on Wastewater Treatment with Plants, Campus I of the Federal University of Goiás, characterizing the flows of the tributary and the effluents of this system to compare the results of the analyzes with the normatives of reuse water. The parameters of apparent color, turbidity, temperature, total suspended solids, total dissolved solids, electrical conductivity, biochemical oxygen demand, dissolved oxygen, pH, hardness, alkalinity, chlorides, total coliforms and thermotolerant coliforms were evaluated. The constructed wetland system consists of an equalization tank and a septic tank, which affluent tributaries to three independent units filled with gravel # 0, grown with Typha latifolia L. macrophytes, followed by three independent filters, consisting of gravel # 0, fine sand and sandy-clay soil. After thirty days of tributary application in the system, three simple sample collections of seven defined points, being one tributary sample, three effluent samples from each unit with plants and three samples from each filter. The percentage of total suspended solids (87.2%), turbidity (75.3%), apparent color (61.5%), chlorides (28.1%), alkalinity (17.7%), total

dissolved solids (16.9%) and biochemical oxygen demand (7.6%). The filters contributed to the reduction of total suspended solids (31.5%), chemical oxygen demand (29.9%), alkalinity (28.8%), chlorides (23.7%), electrical conductivity %), total dissolved solids (19.2%), turbidity (10.0%), hardness (9.5%) and apparent color (4.6%). The final effluent from the constructed wetland system, under current conditions, does not comply with water reuse regulations due to the treatment process being in the stabilization phase.