NOVELTY - Processing a wood fiber fraction comprises performing, in an alternative step, biological or biochemical processing on the fraction; performing physical processing on the fraction where, as a consequence of the physical processing, at least some of the wood fibers processed with a biocatalyst or not processed with a biocatalyst gellify, and forming a gel-like pulp; and recovering the formed gel-like pulp; where the wood fiber fraction comprises fiber containing waste generated in pulp or papermaking industry.    USE - The method is useful for processing wood fiber fraction. The wood fiber gel is useful for manufacturing a carbon nanotube, a fuel pellet, a super capacitor electrode, an electromagnetic shielding material, a building board, a thermal board, and/or an antistatic material (all claimed).    ADVANTAGE - The invention is environment-friendly as it becomes possible to utilize unsuitable waste or corresponding flows generated in connection with pulp manufacture and/or paper manufacture more efficiently.    DETAILED DESCRIPTION - Processing a wood fiber fraction comprises performing, in an alternative step, biological or biochemical processing on the fraction, where one or more biocatalysts having a disintegrating influence on the structure of wood fibers and wood fiber bundles are added to the fraction for weakening the bonds between the wood fibers; performing physical processing on the fraction where, as a consequence of the physical processing, at least some of the wood fibers processed with a biocatalyst or not processed with a biocatalyst gellify, and forming a gel-like pulp; and recovering the formed gel-like pulp; where the wood fiber fraction comprises fiber containing waste generated in pulp or papermaking industry. INDEPENDENT CLAIMS are:    (1) a system (S) for processing a wood fiber fraction, comprising alternatively means for performing biological or biochemical processing on the fraction, where one or more biocatalysts having a disintegrating influence on the structure of wood fibers and wood fiber bundles are added to the fraction for weakening the bonds between the wood fibers; means (M) for performing physical processing on the fraction where, as a consequence of the physical processing, at least some of the wood fibers processed with a biocatalyst or not processed with a biocatalyst gellify, forming a gel-like pulp, and means for recovering the formed gel-like pulp; where the wood fiber fraction comprises fiber containing waste generated in pulp or papermaking industry;    (2) a wood fiber gel produced by the method; and    (3) a wood fiber containing product, comprising the wood fiber pulp, where water has been removed from the wood fiber gel.