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1. WO1997020588 - APPAREIL ET PROCEDE PERMETTANT DE DIMINUER LA DOULEUR LORS D'UNE INJECTION SOUS-CUTANEE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WE CLAIM

1 A trommel for classifying municipal solid waεte (MSW) comprising an inclined cylindrical drum driven to rotate about its axis and havmg perforations in its side wall through which fragments conforming to a predetermined size range may fall, means for introducing MSW at an upper end of the drum, and means for inducing flow of a stream of gas inwardly through the perforations m said side wall and outwardly through the lower end of the drum to retain and remove relatively less dense materials through the lower end of the drum.

2 A trommel aε claimed m claim 1 wherein the side wall of the drum comprises screens havmg perforations that are of progressively increasing size toward a lower end of the drum.

3 A trommel aε claimed m claim 1 wherein the drum has breaking spikes extending inwardly from its mner side

4 A trommel as claimed in claim 1 wherein said gas stream creates a zone of negative preεεure at an upper end of the trommel .

5 A trommel as claimed in claim 1 wherein εaid means for inducing a gas stream comprise blowers dispoεed to blow obliquely on an outer side of the trommel adjacent said perforations.

6. A method of classifying municipal solid waste (MSW) comprising paper, plastics, and non-paper non-plaεtics materials, comprising providing an inclined cylindrical drum rotating about its axis and having
perforations in its side wall, feeding said MSW to an upper end of said drum, and inducing flow of a stream of gas inwardly through said perforations, and recovering through εaid perforations a dense phase relatively poor m said paper and plaεtics and rich in εaid non-paper non-plastics materials, and recovering from a lower end of the drum a light phase relatively poor in said non-paper non-plastics and rich in said paper and plastics .

7. A method as claimed in claim 6 wherein said non- paper non-plastics of said dense phase comprises metals and organic materials .

8. A method as claimed in claim 7 including the step of separating said metals from said denεe phaεe to yield a substrate principally comprising organics materials.

9. A method as claimed in claim 8 wherein said subεtrate comprises digestible organic material, lignin coated cellulose fiber and mercury contaminant and
including the steps of digestion and decontamination of said substrate by conducting the steps of: slurrying εaid subεtrate in an aqueouε phaεe; subjecting the slurry to a primary εtage of anaerobic digeεtion to digeεt at least a εubstantial portion of the organic material; separating aqueouε phase to yield a primary solid digested reεidue; εteam heating the primary εolid residue to yield a water and mercury vapor containing vapor phase and a
subεtantially mercury free solid phaεe; collecting the vapor phase separately from the solid phase and condensing the vapor phase to yield water and mercury in liquid form; elevating the ambient presεure of and explosively
decompresεing the heated solid phase to yield a treated solid phase comprising the fibers in ruptured condition exposing the cellulosic internal surfaces thereof;
slurrying the treated solid phaεe in an aqueous phaεe and εubjecting the εlurry to a secondary stage of anaerobic digestion,- and recovering a secondary solid digested reεidue .

10. A method of digestion and decontamination of municipal solid waste (MSW) comprising digestible organic material, lignm coated cellulose fiber, ana mercury contaminant, comprising slurrying said MSW m an aqueous phase, subjecting the slurry to a primary stage of
anaerobic digestion to digest at least a substantial portion of the organic material, separating aqueous phase to yield a primary solid digested residue, steam heating the primary solid reεidue to yield a water and mercury vapor containing vapor phase and a substantially mercury free solid phase, collecting the vapor phaεe separately from the solid phase and condensing the vapor phase to yield water and mercury in liquid form; elevating the ambient pressure of and then explosively decompressing the heated solid phaεe to yield a treated solid phase
comprising the fibers in ruptured condition exposing the cellulosic internal surfaces thereof, slurrying the treated solid phase an aqueous phase and subjecting the slurry to a secondary stage of anaerobic digestion, and recovering a secondary solid digested residue

11 A method as claimed claim 10 wherein at least one of said steps of subjecting the slurry to a primary stage of anaerobic digestion and subjecting the slurry to a secondary stage of anaerobic digestion compπεeε passing said slurry through a digester having a pervious bottom wall inclining downwardly from an inlet end to an outlet end, and maintaining and regulating a temperature in said slurry elevated above ambient temperature by supplying through said pervious bottom wall a regulated mixture of a gaε heated to above ambient temperature and a non-heated gas.

12. A method as claimed m claim 11 wherein said heated and non-heated gas each originate with gases
withdrawn from an upper region of the digester

13. A method aε claimed m claim 12 wherein at least one region of the slurry in the digester is maintained at a meεophilic temperature condition of about 35 to about 40°C and a second region of the slurry in the digester is maintained at a thermophilic temperature condition of about 55 to about 60°C.

14. A method aε claimed in claim 10 wherein at least one of said primary and εecondary εtageε is conducted in a digester comprising side walls guiding said slurry for flow in a subεtantially εtraight line path between an inlet end and an outlet end.

15. A method as claimed in claim 12 wherein said pervious bottom wall inclines at an angle of about 0.2 to about 0.4 degrees with respect to the horizontal.

16. A method aε claimed in claim 10 wherein the εolid phaεe iε elevated to a εaturated steam preεεure of about 800 to about 1200 pεia before it is explosively
decompressed.

17. A method as claimed in claim 10 including
allowing the water and mercury in liquid form to εtand to form a lower mercury layer and withdrawing the mercury layer separately from the water.

18. A method as claimed in claim 10 wherein said primary εtage digeεts about 50% the incoming organic masε and said second stage digests about 90% of its incoming organic mass .

19. A method as claimed in claim 9 wherein said εecondary digeεted residue compriseε lignin and heavy metals, and including the step of mixing said residue with mineral acid solution to solubilize at least some of said heavy metals and yield an insoluble residue and a heavy metal salt solution comprising heavy metal cations and lignin subjecting the solution to electrolysis and causing electrodeposition of εaid cationε in the presence of said lignin to yield a heavy metal electrodeposit, and recovering the electrodeposit .

20. A method of heavy metals recovery from
anaerobically digested waste residue of municipal solid waste containing lignin and heavy metals, comprising providing said waste residue,- mixing the waste reεidue with mineral acid solution and obtaining a heavy metal salt εolution containing heavy metal cations and lignin in εolution and an inεoluble reεidue; separating the εolution from the inεoluble residue; electrolyzing the separated solution, and causing electrodeposition of the heavy metal cations in the presence of the lignin to yield a heavy metal electrodeposit,- and recovering the electrodeposit.

21. A method as claimed in claim 20 wherein said waste residue comprises plastics material and wherein in said step of mixing, said heavy metal salt solution has a specific gravity of about 1.0 to about 1.4, and at least a portion of said plaεtics material having a density below said εpecific gravity floats on said solution, and
including the εtep of removing and recovering εaid floated plastic material.

22. A method as claimed in claim 20 including
recovering the insoluble residue, neutralizing it by addition of a base and recovering the neutralized residue.