APPLICATION OF SWINE CULTURE TREATED EFFLUENT FOR SWINE MANURE DILUTION AND NITROGEN REMOVAL BY DENITRIFICATION

摘要

This study evaluated the effect of swine manure dilution with treated effluent up to 50 volumetric ratio of each part, intending to increase the denitrification by carbon feeding to the process. In studied dilution, the range of NO3--N content in the mixture was 47,9 +/- 14,5 mg L-1 and COD close to 17543 +/- 675 mg L-1, resulting in favorable denitrification activity on equalization tank due to relation COD/N-NO3- upper to 360. The NO3--N concentration was biologically reduced to 0.5 mg L-1 (around 1 of initial concentration). An improvement in solid-liquid separation efficiency using natural and synthetic organic polymers was also reached in the diluted effluent when compared to the undiluted manure.