Production of biochar from slow pyrolysis of biomass is a promising carbon negative procedure since it
removes the net carbon dioxide in the atmosphere and produce recalcitrant carbon suitable for sequestration in soil.
Biochar production can vary significantly with the pyrolysis parameter. This study investigated the impact of
temperature and heating rate on the yield and properties of biochar derived from cassava plantations residues which
are cassava stem (CS) and cassava rhizome (CR). The pyrolysis temperatures ranged from 400C to 600C while the
heating rate parameter was varied from 5C/min to 25C/min. The experiment was conducted using the lab scale slow
pyrolysis system. The increment of temperature and heating rate of slow pyrolysis for both cassava wastes had raised
the fixed carbon content of the biochar but decreased the biochar yield. More biochar was produced at lower
temperature and lower heating rate. Temperature gave more influence on the biochar yield as compared to the heating
rate parameter. The highest biochar yield of more than 35 mf wt. % can be obtained from both CS and CR at 400 C
and heating rate of 5C/min. From the proximate analysis, the results showed that cassava wastes contain high
percentage of volatile matter which is more than 80 mf wt. %. Meanwhile, the biochar produced from cassava wastes
contain high percentage of fixed carbon which is about 5 8 times higher than their raw samples. This suggested that,
it is a good step to convert CS and CR into high carbon biochar via slow pyrolysis process that can substantially yield
more biochar, up to 37 mf wt. % in this study. Since the fixed carbon content for both CS and CR biochar produced in
any studied parameter were found to be more than 75 mf wt. %, it is suggested that biochar from cassava wastes is
suitable for carbon sequestration.