Deinking of recycled mixed office paper using two endo-glucanases, CelB and CelE, from the anaerobic fungus Orpinomyces PC-2.Application: Two enzymes, CelE and CelB, make it easier to remove ink particles <onlyinclude> This is a list of particles in particle physics, including currently known and hypothetical elementary particles, as well as the composite particles that can be built up from them. from mixed office paper, turning this type of used paper into a more suitable candidate for recycling recycling, the process of recovering and reusing waste products—from household use, manufacturing, agriculture, and business—and thereby reducing their burden on the environment. . Used paper is recycled to preserve forest resources and reduce the costs of municipal waste treatments. Currently, mixed office paper (MOP (Millionaire On Paper) Refers to people who have wealth tied up in company stock options, which cannot be exercised until a certain date. During the dot-com boom, tens of thousands of MOPs were created, but many unfortunately never cashed in before the stock became ) is one type of paper that is recycled without much enthusiasm. It is difficult to remove the ink particles in MOP with conventional chemical methods, but MOP can be treated with enzymes to improve deinking and decrease treatment costs. We studied the deinking of MOP using two pure endo-glucanases, CelB and CelE. Most enzymatic treatments of MOP involve some mixture of glucanases, which makes it hard to distinguish the contributions of the individual enzymes. To improve the way in which we use enzymes to treat MOP, we first have to understand how each enzyme works to facilitate deinking. We treated MOP pulp with CelB and CelE and then used a flotation flotation or froth flotation Most widely used process for extracting many minerals from their ores. The method separates and concentrates ores by altering their surfaces so that they are either repelled or attracted by water. stage to remove ink. The treatments significantly reduced dirt count and residual ink area, and brightness of the pulp increased. The two enzymes have different optimal dosages for deinking. CelE appeared to have better deinking effects than CelB, but CelB was more effective at hydrolyzing cellulose cellulose, chief constituent of the cell walls of plants. Chemically, it is a carbohydrate that is a high molecular weight polysaccharide. Raw cotton is composed of 91% pure cellulose; other important natural sources are flax, hemp, jute, straw, and wood. . Geng and Li are with the Dept. of Wood Science and Engineering, Oregon State University Oregon State University, at Corvallis; land-grant and state supported; coeducational; chartered 1858 as Corvallis College, opened 1865. In 1868 it was designated Oregon's land-grant agricultural college and was taken over completely by the state in 1885. , Corvallis, OR 97331-5751. Email Li at kaichang.li@orst.edu. |
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