Table 2.

Density of ecological briquettes with 10% 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. 10%)	0.623a ± 0.001	0.625a ± 0.002	0.626a ± 0.003
Gum arabic (wt. 10%)	0.620a ± 0.001	0.619b ± 0,003	0.623ab ± 0.001
Starch (cassava) (wt. 10%)	0.619ab ± 0.002	0.618b ± 0.003	0.621bc ± 0.002
Black clay (wt. 10%)	0.608ab ± 0.001	0.615c ± 0.002	0.619c ± 0.002
Cow dung (wt. 10%)	0.572c ± 0.002	0.581d ± 0.003	0.588d ± 0.002