Reúso de água cinza escura no cultivo hidropônico.

Abstract

The dark grey water reuse in hydroponic cultivation after treatment in gravel and sand filters of different granulometrics was studied on the campus of CCTA/UFCG, since the release of untreated effluents in receptors can cause serious environmental damage and its reuse can minimize the adverse effects of water deficit in the region. Analyses were undertaken of the physical, chemical and microbiological parameters for gray water samples in natura and the three effluent filters. One can observe a removal efficiency of approximately 30 to 98% of turbidity and 30 to 95% apparentcolor. The results obtained in the analysis were conducive to hidropônia and also proved favourable compared with those set out in the resolution CONAMA 357/2005 supplemented and amended by CONAMA resolution 430/2011, for release in effluent standards bodies. It was noted that the values of pH, temperature, materials liable to sedimentation and nutrients showed acceptable levels for disposal. It is concluded that the system of filters can be applied both to the grey water treatment for disposal in bodies as receivers for reuse in hydroponics, since the system is operated by trained and qualified personnel, especially as it pertains to sanitize the water reused and under-irrigated greenery, to avoid cases of contamination, like what happened in the sample of lettuce this experiment.