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Recovery of clean energy precursors from Bambara groundnut waste via pyrolysis: Kinetics, products distribution and optimisation using response surface methodology

Author:
Mohammed, Isah Yakub, Abakr, Yousif Abdalla, Xing Hui, Jershen Nga, Alaba, Peter Adeniyi, Morris, Kenobi Isima, Ibrahim, Mustapha Danladi
Source:
Journal of cleaner production 2017 v.164 pp. 1430-1445
ISSN:
0959-6526
Subject:
Vigna subterranea, activation energy, biochar, biocompatible materials, biofuels, clean energy, energy, food crops, kinetics, models, nitrogen, peanut hulls, pyrolysis, response surface methodology, temperature, wastes
Abstract:
This study presents first comprehensive thermochemical analysis of Bambara groundnut shell. Pyrolysis characteristics was examined under non-isothermal degradation in nitrogen atmosphere at different heating rates (10, 15 and 20 °C/min) using single-step global model kinetic model. The single-step global model average apparent activation energy was found to be 142.64 ± 5.7 kJ/mol. Pyrolysis was conducted in a fixed bed reactor. Effects of pyrolysis temperature (450–750 °C), heating rate (20–50 °C/min) and nitrogen flow rate (5–25 L/min) were investigated collectively. The process variables were optimized using response surface methodology with central composite design. Optimum bio-oil yield of 36.49 wt% was recorded at 600 °C, 50 °C/min and 11 L/min. The bio-oil, bio-char and non-condensable gas collected were comprehensively characterised. Energy analysis of the products was also evaluated. This study revealed that Bambara groundnut shell, a residue from food crop, is a potential source of energy precursors for development of a sustainable bioenergy system and biomaterials.
Agid:
5734765