Characterization of biochars from different sources and evaluation of release of nutrients and contaminants

摘要: The biochar, product of pyrolysis organic waste, has been used as a soil conditioner and alternative on solid waste management. However, the raw material temperature influence quantity dynamics release nutrients contaminants from biochar. objective wasto evaluate use sugarcane bagasse, eucalyptus sewage sludge for production biochar determine chemical, physical, mineralogical properties acid extraction these materials produced at 350 °C 500 °C. Were evaluated proportion C, H, N, O; ashes; macro micronutrients, plus some contaminants; characterization mineral phases by diffractometry X- rays; functional groups infrared absorption spectroscopy (FTIR). Moreover, it was determined in increasing concentration HNO3 (0,01 - 2,0 mol L-1). O/C H/C relations decreased with pyrolysis, which define greater stability C biochars. Sewage (BC-L) had highest nutrient rates contaminant metals (Cd, Cr, Ni Pb). Acid other biocarvoes very low (<20% total content). results indicate that carbon fraction contributes to rateof elements place.