a process for manufacturing fiber boards and similar wood - based products from a lignocellulosic raw material having a moisture content of at least 10 wt -%. according to the process , an aqueous fraction is separated from the fibers of the raw material , which fraction later is recycled to the process in order to form at least a part of the agent used for binding the fibers . before mixing with the fibers , the aqueous effluent is concentrated and enzymatically oxidized in the presence of oxygen in order to polymerize the solubilized wood material and in order to increase its concentration . lignin can be added to the water solubilized wood material or the solubilized wood material can be added to the fibers together with another binder . eventually , the mixture is formed into a board and hardened .