Sample and pretreatment method | Total energy input of initial size reduction + chemical treatment + milling (MJ/kg) | Glucose mass yield (kg/kg biomass) | Energy efficiency (glucose mass yield/energy input, kg/MJ) | Other reducing sugars mass yield (kg/kg biomass) | Energy efficiency (other reducing sugar mass yield/energy input, kg/MJ) | Energy efficiency (total sugar mass yield/energy input, kg/MJ) [normalized to 65 % carbohydrate equivalent] |
---|---|---|---|---|---|---|
Switchgrass, 10 wt% gaseous ammonia + attritor millingi | 2.012 (DM = 93 %) | 0.309 (total soluble)b | 0.154 | 0.242 (total soluble xylose + arabinose) | 0.120 (xylose + arabinose) | 0.274 [0.280] (total soluble sugars) |
Switchgrass, extrusion and microwave treatmenta,j | 900 for microwave alone | 0.199c | 2.21 × 10−4 | 0.1744 | 0.194 × 10−4 | 4.14 × 10−4 |
Steam explosion (Spruce)k | 1.977f (L/S = 1) | 0.346d (monomeric) | 0.175 | h | [0.260] (monomeric sugars) | |
Organosolv (Lodgepole pine)l | 2.687f (L/S = 7) 1.613f (L/S = 4) 1.254f (L/S = 3) | 0.347e (monomeric) | 0.129 0.215 0.277 | h | [0.187] [0.311] [0.400] (monomeric sugars) | |
SPORL (Spruce)m (Lodgepole pine)o | 1.863f (L/S = 3) L/S = 3 | 0.372d (monomeric) | 0.200 | h h | [0.350] (size reduction energy 150 kW-h/ton) (monomeric sugars) [0.270] | |
Wheat straw without chemical pretreatmentn | 2.149 g (L/S = 0.2) | 0.118 | 0.0549 | 0.058 | ||
Wheat straw with 5 % w/w NaOH dilute pretreatmentn | 2.867 g (L/S = 5) | 0.332 | 0.116 | 0.181 | ||
Wheat straw with 5 % w/w NaOH “dry” pretreatmentn | 1.307 g (L/S = 0.2) | 0.32 | 0.245 | 0.212 | ||
Wheat straw with 5 % w/w NH3 “dry” pretreatmentn | 1.620 g (L/S = 0.2) | 0.14 | 0.0864 | 0.071 |