INFLUENCE OF PYROLYSIS TEMPERATURE WITHOUT pH, CONDUCTIVITY AND CTC IN AGRO WASTE PYROLYSIS PRODUCTS

Abstract

The agro-industrial sector today faces a significant challenge, which is to satisfy world demand. Tons of food are produced and processed every day worldwide. The generation of waste in the food sector increases proportionally to production, which highlights the significance of enabling its valorization. In this context, this work analyzes the biochars produced from sugarcane bagasse, rice husks, and green coconut shells to verify the influence of peak temperature on parameters such as pH, conductivity, and cation exchange capacity from biochars obtained from different types of biomass. The pyrolysis process was carried out in a bench-scale reactor on a fixed bed condition with the following settings: peak temperatures of 350,  450, and 550 °C; the heating rate of 10 °C min-1; and soaking time of 30 minutes. The results obtained indicate, which type of biomass and which operating conditions is the most suitable to obtain biochar that meets the least requirements to be used as a soil conditioner. The green coconut shell presented the most appealing conditions, obtained with 10.3 µ / s (pH) and 1945 uScm-1 (conductivity) at 550 °C and 87 mmol/kg (cation exchange capacity) at 450 °C. Through the results it was possible to identify that biochar obtained at higher temperatures presented more favorable conditions for the prospective application.