Caracterização química de biocarvões produzidos a partir de biossólido e bagaço de cana-de-açúcar

The adequate characterization of solid residues is important, as it makes it possible to estimate the variability of its composition, helping to define its use in the soil. The objective of the presente study was to characterize raw materials and biochars produced under laboratory conditions, in order to analyze their feasibiity for use in the soil. Thus, the biochars were produced from the dry sample of biosolid and, from a dry sample of sugarcane bagasse, separately, by means of slow pyrolysis at a temperature of 350°C. A design with five replications was used, where the treatments were constituted by: pure biosolid (BP); pure sugarcane bagasse (BCP); biosolid biochar (BB); sugarcane bagasse biochar (BBC). The evaluation of raw materials and biochars was through immediate analysis, hydrogenion potential, electrical conductivity, organic matter, total nitrogen, cátion Exchange capacity, and X-ray fluorescence spectrometry. The data obtained in the characterization of the materials were submited to analysis of variance by the SISVAR program. To compare the means, the Tukey test was used program. To compare the means, the Tukey test was used at 5% probability (p<0.05). BP and BB had more alcaline pH, higher ash contente, higher nitrogen content and cátion Exchange capacity. While the BCP nd BBC showed higher values for organic matter and carbono. The raw materials and their respective biochars showed characteristics suitable for agricultural use, mainly BP and BB, and BP and BB can be used as soil correctors, as They have na alcaline pH of 12.02 and 9.64.