The yield of the manufacture of cellulose nanofibres from the sludge is 95 pecent, compared with cellulose nanofiber production from wood chips and lignin residues 48 percent.”This is definitely the best result we have had in producing nanofibers from different bio-residues. Presumably, this is a very profitable production, that cellulose industries should take an interest in,” said Kristiina Oksman, Professor at Luleå University of Technology.Cellulose nanofibers, manufactured from this sludge, are probably shorter than the cellulose nanofibers made from pulp but are finer and can form dense films with excellent barrier properties.A few years ago, cellulose industries in Sweden, disposed some of their waste as sludge into the ocean. It is now prohibited, and the sludge is stored in large tanks on land. This particular cellulose sludge makes it possible to produce, so far, the most profitable production of cellulose nanofibers from bio-residue products.”The separation of cellulose nanofibers from bioresidues is energy demanding, but when we separate the waste from Domsjö pulp mill, the energy consumption is lower. The special cellulose from Domsjö has very small size and it also has high cellulose content and therefore the fibers do not need to be chemically pre-treated before the production of cellulose nanofibers,” Professor Oksman said.