[Enzymatic hydrolysis of steam-exploded rice straw in membrane bioreactor].

An ultrafiltration membrane bioreactor consisted of 1 - 6 enzymatic vessel was used to increase the reducing sugar concentration. The effects of enzyme loading, the number of enzymatic vessel and the dilution rate on enzymatic hydrolysis of steam-exploded rice straw were studied. The results show that the best condition is: 20FPU/g, four enzymatic vessels and 0.075/h (D). Compared with traditional batch reaction, the conversion of substrate increased significantly from 18% - 21% to 39.5%. Compared with the ultrafiltration membrane bioreactor consisted of one enzymatic vessel, the production of reducing sugar increased from 0.25 g/ g to 0.4g/g, and the final reducing sugar concentration in the product stream increased from 4.56g/L to 27.23g/L.