Effect of alkaline delignification on physico-chemical and combustion properties of bean chaff briquette
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Abstract
Abstract. Abimbola AI, Rapheal IA, Abayomi B, Moki EC, Ayodele OO. 2021. Effect of alkaline delignification on physico-chemical and combustion properties of bean chaff briquette. Asian J Trop Biotechnol 19: 20-27. Adopting lignocellulose-rich agro-waste materials for briquette production could be regarded as a better alternative energy source and also helps to ameliorate the challenges associated with deforestation and agro-waste disposal. This study examined the effects of alkali pretreatment on briquettes produced from bean chaffs. The proximate analysis, Energy Dispersive X-ray Fluorescence (EDXRF), Fourier-Transform Infrared (FTIR) analysis, Scanning electron microscopy (SEM), physical analysis and combustion properties were determined for the briquettes produced. The mean moisture content of 3.52±0.10% and 5.81±0.01% were recorded for Treated Bean Chaff (TBC) and Untreated Bean Chaff (UBC) briquettes, respectively. A high heating value of 24.18±0.12 MJ/kg was recorded for TBC compared to 21.12±0.01 MJ/kg of UBC briquette samples. Furthermore, it was observed that alkali pretreatment reduced the percentage of Potential Toxic Element (PTE) concentration in the treated sample, as shown by EDXRF. The FTIR results reveal surface modification in the fiber matrix shown by the C-O band shift from 1013 cm-1 observed in TBC to 1010 cm-1 recorded in UBC. In contrast, SEM shows clear disruption in the biomass matrix due to the alkali pretreatment process. The findings of this study show that the alkaline pretreated bean chaff briquettes have a great potential to be used as biomass fuel.