Table 3.

Density of ecological briquettes with 15% of binder.

Proportion of binder/biomass	Briquettes coal density (g/cm3)
	Rice husks	Peanut shells	Straws
Binder (wt. 0%)	0.554d ± 0.002	0.563e ± 0.005	0.573e ± 0.002
Bark of G. bicolor (wt. 15%)	0.626a ± 0.003	0.632a ± 0.002	0.636a ± 0.001
Gum arabic (wt. 15%)	0.625a ± 0.002	0.631a ± 0.001	0.633ab ± 0.002
Starch (cassava) (wt. 15%)	0.624a ± 0.001	0.627b ± 0.002	0.631b ± 0.001
Black clay (wt. 15%)	0.619b ± 0.002	0.622c ± 0.002	0.625c ± 0.003
Cow dung (wt. 15%)	0.575c ± 0.003	0.589d ± 0.001	0.605d ± 0.002