A method for preparing a homogenous cellulosic product from...

D - Textiles – Paper – 21 – C

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D21C 5/02 (2006.01) A61L 11/00 (2006.01) B02C 19/00 (2006.01) B09B 3/00 (2006.01)

Patent

CA 2464090

A method for treating diverse pulp and paper materials, including such products contained in municipal solid waste and biohazardous wastes, to produce a homogenous cellulosic product comprises the steps of feeding diverse pulp and paper materials into a vessel, introducing steam into the vessel while agitating the materials, purging the gases from the vessel while agitating the materials, sealing the vessel so that the vessel is pressure tight, saturating the materials with steam at sufficient temperature and pressure to expand the physical and chemical structure of the materials, while agitating the materials, depressurizing the vessel to further enhance the physical and chemical expansion of the materials, and discharging the processed products. Alternatively, the method can be performed without purging the gases, if the temperature in the range of about 140 ~C to about 160 ~C, and the pressure is in the range of about 275 to 450 kPa. During the optional purging step, during the depressurization step, and during the optional evacuation step, volatile organic compounds and other air pollutants can be captured and treated. The temperature, pressure, and process time is more than sufficient to decontaminate and sterilize biohazardous laboratory and medical wastes.

L'invention concerne un procédé de traitement de divers matériaux à base de pulpe et de papier, y compris les produits issus de déchets solides et biologiquement dangereux, à l'échelle des municipalités, visant à élaborer un produit cellulosique homogène, selon les étapes suivantes: introduction des matériaux divers en question dans un récipient; injection de vapeur et agitation des matériaux dans le récipient; purge des gaz sous agitation maintenue; mise en étanchéité du récipient par rapport à la pression; saturation des matériaux en vapeur, sous température et pression suffisantes, pour induire une expansion de la structure physique et chimique des matériau, en maintenant l'agitation; dépressurisation pour accroître l'expansion susmentionnée; et évacuation des produits ainsi traités. On peut aussi conduire le procédé sans purge de gaz, si la température est comprise entre environ 140 ·C et environ 160 ·C, et si la pression est comprise environ 275 et 450 kPa. Durant la purge facultative, la dépressurisation, et l'évacuation facultative, on peut capturer et traiter des composés organiques volatils et d'autres polluants atmosphériques. La température, la pression et le temps de traitement suffisent largement pour décontaminer et stériliser des déchets de laboratoire et médicaux biologiquement dangereux.

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