An adsorptive-filtration media for the capture of waterborne...

E - Fixed Constructions – 02 – B

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E02B 11/00 (2006.01) B01D 39/06 (2006.01) B01J 20/00 (2006.01) B01J 20/32 (2006.01) B01J 43/00 (2006.01) C02F 1/28 (2006.01) C04B 2/10 (2006.01)

Patent

CA 2429510

A sorptive-filtration media for the capture of waterborne or airborne constituents. The media comprises a granular substrate and an amphoteric compound bonded to the substrate in the presence of a crystal inhibiting agent. The media can also comprise a substrate having a specific gravity of less than 1.0 and an amphoteric compound bonded to the substrate. Another media comprises a substrate with a specific surface area of greater than 0.1 m2/gm and an amphoteric compound bonded to the substrate. Another media includes a granular substrate and a manganese oxide amphoteric compound formed on the substrate. Also disclosed is a pavement material for the capture of waterborne constituents. The pavement material comprises a porous pavement substrate and an amphoteric compound bonded to the substrate. Also disclosed is a method for producing a porous, cementitious material. The method includes the steps of providing and thoroughly mixing cement and aggregate, mixing water with the cement and aggregate into a slurry while maintaining a water to cement ratio of less than one, initiating curing of said slurry under pressure and in the presence of steam, and continuing the curing at ambient temperature and pressure until the cementitious material is substantially dry.

L'invention concerne un support de filtration adsorptive destiné à la capture d'éléments en suspension dans l'eau ou dans l'air. Ce support comprend un substrat granuleux et un composé amphotère fixé au substrat en présence d'un agent inhibiteur cristallin. Le support peut également comprend un substrat présentant une densité relative inférieure à 1,0 et un composé amphotère relié au substrat. Un autre support comprend un substrat présentant une surface utile supérieure à 0,1 m?2¿/gm et un composé amphotère relié au substrat. Un autre support comprend un substrat granuleux et un composé amphotère d'oxyde de manganèse formé sur le substrat. L'invention concerne également un matériau de revêtement poreux et un composé amphotère relié au substrat. En outre, l'invention concerne un procédé permettant de produire un matériau cimentaire poreux. Ce procédé consiste à fournir et à mélanger minutieusement le ciment et l'aggrégat; à mélanger l'eau avec le ciment et l'aggrégat jusqu'à obtention d'une pâte tout en maintenant un rapport eau/ciment inférieur à un; à démarrer le séchage de la pâte à une certaine pression et en présence de vapeur; puis à continuer ce séchage à température et à pression ambiantes jusqu'à ce que le matériau cimentaire soit pratiquement sec.

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