Table 1.

Density of ecological briquettes with 5% of binder.

Proportion of binder/biomass	Briquettes coal density (g/cm3)
	Rice husks	Peanut shells	Straws
Binder (wt.0%)	0.554f ± 0.002	0.563d ± 0.005	0.573c ± 0.002
Bark of G. bicolor (wt.5%)	0.602a ± 0.003	0.608a ± 0.006	0.616a ± 0.003
Gum arabic (wt.5%)	0.594b ± 0,003	0.602ab ± 0.007	0.613a ± 0.002
Starch (cassava) (wt.5%)	0.589c ± 0,002	0.586bc± 0.004	0.610a ± 0.003
Black clay (wt.5%)	0.578d ± 0.001	0.586bc ± 0.006	0.594b ± 0.002
Cow dung (wt.5%)	0.562e ± 0.003	0.575d ± 0.007	0.578c ± 0.002