초록

A composite material for environmental odor control is useful in controlling odors from waste, for example, as an alternative daily cover for landfills and in composting applications. The composite material includes a fiber web and a zeolite containing metals to promote absorption of odorous gas.

대표청구항 ▼

1. A waste odor control composite comprising: (a) a fiber web; and(b) one or more zeolites containing between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe,wherein the odor control composite has a weight per

1. A waste odor control composite comprising: (a) a fiber web; and(b) one or more zeolites containing between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe,wherein the odor control composite has a weight per unit area between about 30 g/m2 and about 250 g/m2 and a tensile strength between about 10 Nm/g and about 200 Nm/g; andwherein the composite is configured as a composting bag. 2. An odor control composite comprising: (a) a fiber web; and(b) one or more first zeolites incorporated within the fiber web, wherein the one or more first zeolites contains between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe, and wherein the one or more first zeolites has a median particle size of less than about 50 microns with 95% of the particles smaller than about 100 microns; and(c) one or more second zeolites coated on a surface of the fiber web, wherein the one or more second zeolites contains between about 0.2% and about 4% zinc by weight, and between about 0.4% and about 4% by weight of one or more metal ions chosen from K, Li, Mg, Ba and Fe, and wherein the one or more second zeolites has a median particle size of less than about 25 microns with 95% of the particles smaller than about 50 microns; andwherein the composite is configured as a composting bag. 3. A method of making an odor control composite, the method comprising: (a) contacting at least one zeolite with a solution of one or more metal ions, whereby the one or more metal ions diffuses into the zeolite to form at least one ion exchanged zeolite, wherein the at least one ion exchanged zeolite contains between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe;(b) preparing first zeolite particles of at least one ion exchanged zeolite having a median particle size of less than about 50 microns with 95% of the particles smaller than about 100 microns;(c) contacting fibers with a liquid to form a slurry;(d) incorporating the first zeolite particles into the fiber slurry;(e) forming a fiber web from the slurry;(f) preparing second zeolite particles of at least one ion exchanged zeolite having a median particle size of less than about 25 microns with about 95% of the particles smaller than about 50 microns;(g) applying the second zeolite particles to one or more surfaces of the fiber web; and(f) forming the fiber web into a cover for a landfill. 4. A method of making an odor control composite, the method comprising: (a) contacting at least one zeolite with a solution of one or more metal ions, whereby the one or more metal ions diffuses into the zeolite to form at least one ion exchanged zeolite, wherein the at least one ion exchanged zeolite contains between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe;(b) preparing first zeolite particles of at least one ion exchanged zeolite having a median particle size of less than about 50 microns with 95% of the particles smaller than about 100 microns;(c) contacting fibers with a liquid to form a slurry;(d) incorporating the first zeolite particles into the fiber slurry;(e) forming a fiber web from the slurry;(f) preparing second zeolite particles of at least one ion exchanged zeolite having a median particle size of less than about 25 microns with about 95% of the particles smaller than about 50 microns;(g) applying the second zeolite particles to one or more surfaces of the fiber web; and(f) further comprising forming the fiber web into a compost bag. 5. A method of controlling odor from a landfill, the method comprising covering at least a portion of the landfill with a cover comprising an odor control composite, the odor control composite comprising: (a) a fiber web; and(b) one or more zeolites containing between about 0.2% and about 4% Zn by weight, and between about 0.4% and about 4% by weight of one or more metals chosen from K, Li, Mg, Ba and Fe,wherein the odor control composite has a weight per unit area between about 30 g/m2 and about 250 g/m2 and a tensile strength between about 10 Nm/g and about 200 Nm/g. 6. The method of claim 5, wherein covering at least a portion of the landfill comprises providing the cover in the form of a roll having a width of at least about 36 inches and a diameter of at least about 24 inches, and unrolling the roll over an exposed surface of a landfill. 7. The method of claim 5, further comprising ballasting the cover. 8. The method of claim 7, wherein ballasting comprises placing waste derived ballast, sand, boiler ash, or ground organic matter on the unrolled cover. 9. The method of claim 7, wherein ballasting comprises placing weights on a surface of the cover as it is unrolled. 10. The method of claim 5, wherein the odor control composite comprises a paper product. 11. The method of claim 3, wherein the cover is an alternative daily cover. 12. The method of claim 5, wherein the cover is an alternative daily cover. 13. The method of claim 6, wherein the cover is an alternative daily cover. 14. The method of claim 7, wherein the cover is an alternative daily cover. 15. The method of claim 8, wherein the cover is an alternative daily cover. 16. The method of claim 9, wherein the cover is an alternative daily cover. 17. The method of claim 10, wherein the cover is an alternative daily cover.