Abstract
We have developed a novel process for the separation of uninked from inked fibers in old newspaper (ONP). The process consists of two connected batch reactors in which ONP is pulped in one with the enzyme, cellulase. After several hours, uninked pulp fibers are retained in one vessel by means of a plastic mesh screen while inked fibers migrate with the liquid flow to the other vessel where they are also retained. The uninked fibers were shown to be high–quality secondary fibers based on their strength and length. Because the process does not use traditional de–inking chemicals, it does not produce a waste water effluent that needs to be rendered harmless before being discharged into the environment. In addition, preliminary estimates suggest that its use could result in significant energy savings for industry employing traditional chemical de–inking facilities.
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