Research Article

Optimization of Sulfide/Sulfite Pretreatment of Lignocellulosic Biomass for Lactic Acid Production

Figure 2

Biomass residues during different experimental runs: (a) when biomass was treated with Na2S; (b) when biomass was treated with Na2SO3.
934171.fig.002a
(a) Biomass residues after Na2S treatment
934171.fig.002b
(b) Biomass residues after Na2SO3 treatment