Hydrolysis of cellulosic fines in primary clarified sludge of paper mills and the addition of a surfactant to increase the yield
AssigneeThe Research Foundation for The State University of New York
InventorsByeong Cheol Min, Bhavin V. Bhayani, Bandaru V. Ramarao
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Abstract
A method for processing a stream of cellulosic fines containing inorganic particles, to increase a hydrolysis yield of polysaccharide degradation enzymes, such fines in a waste stream from a recycled packaging paper mill to produce a stream of fermentable sugars, comprising treating the fines with a surfactant which selectively binds to the inorganic particles and which reduces binding to the inorganic particles by the polysaccharide degradation enzymes, and degrading polysaccharides in the waste stream with the polysaccharide degradation enzymes.
Claims20
A method for processing a stream of cellulosic fines rejected from a repulped old corrugated containerboard process for recycling old corrugated containerboard, containing cellulosic fines, and a remainder of 25-65% by oven dry weight of solids being ash-producing components including inorganic particles comprising at least one of calcium carbonate and kaolin, having an affinity for polysaccharide degradative enzymes and reducing the activity of the polysaccharide degradative enzymes in degrading the cellulosic fines, comprising:
- adding at least one polysaccharide degradative enzyme to the stream;
- adding at least one non-ionic surfactant to the stream in an amount of between 3% and 11% based on the oven dry weight of the stream, adapted to selectively bind surfaces of the at least one of calcium carbonate and kaolin to reduce affinity for the polysaccharide degradative enzymes without inactivating the polysaccharide degradative enzymes, to thereby increase a hydrolytic activity of the at least one polysaccharide degradative enzyme on the cellulosic fines as compared to an absence of the at least one non-ionic surfactant;
- and
- maintaining a solution comprising the cellulosic fines, inorganic particles, at least one non-ionic surfactant, and at least one polysaccharide degradative enzyme for a sufficient period of time to degrade at least a portion of the cellulosic fines into fermentable sugars.
A method for enzymatically hydrolyzing a mixed stream from a repulped old corrugated containerboard process, comprising cellulosic fines separated from pulp suitable for recycling, containing primarily cellulose and hemicelluloses, and a remainder of 25-65% by oven dry weight of solids as ash-producing constituents including inorganic particles comprising at least one of calcium carbonate and kaolin, having a competitive binding affinity for hydrolytic enzymes, comprising:
- adding at least one hydrolytic enzyme to the mixed stream;
- adding at least one non-ionic surfactant to the mixed stream in an amount of between 3% and 11% based on the oven dry weight of the mixed stream, to decrease a binding affinity of the at least one hydrolytic enzyme for the inorganic particles and thereby increase a hydrolytic activity of the at least one hydrolytic enzyme as compared to an absence of the at least one non-ionic surfactant on the cellulosic fines;
- and
- hydrolyzing the cellulosic fines with the hydrolytic enzyme.
A method for enzymatically hydrolyzing cellulosic fines in a mixed stream from an old corrugated cardboard recycling process in which the cellulosic fines are separated from pulp for recycling, with at least one hydrolytic enzyme, the mixed stream comprising cellulosic fines containing lignin and a remainder of 25-65% by oven dry weight solids as ash producing inorganic particles comprising at least one of calcium carbonate and kaolin, comprising:
- adding at least one non-ionic surfactant to the mixed stream in an amount of between 3% and 10% based on the oven dry weight of the mixed stream, to selectively reduce an affinity of at least one hydrolytic enzyme for the at least one of calcium carbonate and kaolin and to selectively increase a hydrolytic activity with respect to the cellulosic fines of the at least one hydrolytic enzyme as compared to an absence of the at least one non-ionic surfactant;
- adding the at least one hydrolytic enzyme to a solution containing the mixed stream of cellulosic fines and inorganic particles and the at least one non-ionic surfactant;
- and
- hydrolyzing the cellulosic fines with the at least one hydrolytic enzyme.
Dependencies are inferred from the claim text.