Quantification Of Tannins Present In The Bark Of Mimosa Caealpiniifolia Benth. And Its Use In Effluent Treatment

This study aimed to analyze the concentrations of tannins in the bark of Mimosa caealpiniifolia Benth. trees, and their potential for effluent treatment. The bark was removed from five trees in an experimental area located at the Federal University of Rio Grande do Norte, Campus Macaiba. They were dried and ground to reduce their granulometry. Next, tannin extraction and determination of total solids content (TST), condensed tannin content (TTC) and Stiasny index (I) were performed. To characterize the effluent, the turbidity index/NTU, initial pH and apparent color were analyzed. The mean value found for TST, I and TTC were, respectively, 11.30, 71.43 and 6.56%. The turbidity/NTU and pH index found were 1.77 and 5, respectively. The tannin without chemical modifications has little efficiency in removing turbidity, however, it has been proven that the tannin has ability to coagulate.