Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars

A process for preparation of a sugar product from lignocellulosic material, said process comprising:

• a) pretreating the lignocellulosic material,
• b) enzymatically hydrolysing the pretreated lignocellulosic material in an enzymatic hydrolysis to obtain the sugar product in a process comprising:
• i) first treating the lignocellulosic material with an enzyme composition comprising a lytic polysaccharide monooxygenase and a polypeptide selected from the group consisting of a cellobiohydrolase, an endoglucanase, a beta-glucosidase, a beta-xylosidase, an endoxylanase and any combination thereof, then
• ii) adding oxygen to the mixture comprising the lignocellulosic material and the enzyme composition, and thereafter
• iii) adding additional lytic polysaccharide monooxygenase to the mixture comprising the lignocellulosic material and the enzyme composition, and
• c) optionally, recovering the sugar product.