Process and apparatus for treating waste and sewage sludge
Assignee"Holderbank" Financiere Glarus AG
InventorAlfred Edlinger
Life of this patent
Estimating the term…
Abstract
Waste (such as domestic garbage, industrial waste, and bulky refuse) or sewage sludge is pretreated by pyrolysis under an oxygen-poor atmosphere to provide solid pyrolysis residues and a pyrolysis gas. The solid pyrolysis residues are mechanically treated to provide a coarse fraction and a fine fraction. The coarse fraction is mechanically separated and fed to a metal bath reactor containing a metal bath and a liquid slag floating on the metal bath. The fine fraction entrained in a carrier gas is fed via a nozzle in order to carburize the metal bath. The carburized metal bath functions to reduce metal oxides from the liquid slag floated thereon, thereby purifying the liquid slag. At least a portion of the pyrolysis gas is used to smelt and heat the liquid slag.
Claims12
A process for treating sewage sludge or waste, said process comprising:
- subjecting the sewage sludge or waste to pyrolysis under an oxygen-poor atmosphere to provide solid pyrolysis residues and a pyrolysis gas;
- mechanically treating the solid pyrolysis residues to separate a coarse fraction and a fine fraction, the coarse fraction including metal oxides;
- feeding the coarse fraction into a liquid slag contained in a metal bath reactor, the metal bath reactor also containing a metal bath on which the liquid slag floats;
- entraining the fine fraction in a carrier gas and introducing the entrained fine fraction and the carrier gas via a nozzle into the metal bath contained in the metal bath reactor in order to carburize the metal bath;
- reacting the carburized metal bath with the liquid slag to reduce the metal oxides of the coarse fraction contained in the liquid slag;
- and
- smelting and heating the liquid slag with at least a portion of the pyrolysis gas.
A process for treating sewage sludge or waste, said process comprising:
- subjecting the sewage sludge or waste to pyrolysis under an oxygen-poor atmosphere to provide solid pyrolysis residues and a pyrolysis gas;
- mechanically treating the solid pyrolysis residues to separate a coarse fraction and a fine fraction;
- feeding the coarse fraction into a liquid slag contained in a metal bath reactor, the metal bath reactor also containing a metal bath on which the liquid slag floats;
- entraining the fine fraction in a carrier gas and introducing the entrained fine fraction and the carrier gas via a nozzle into the metal bath contained in the metal bath reactor in order to carburize the metal bath;
- and
- blowing oxygen or air into the metal bath via tuyeres;
- smelting and heating the liquid slats with at least a portion of the pyrolysis gas,
- wherein the oxygen or air is enveloped by hydrocarbons.
A process for treating sewage sludge or waste, said process comprising:
- subjecting the sewage sludge or waste to pyrolysis under an oxygen-poor atmosphere to provide solid pyrolysis residues and a pyrolysis gas;
- mechanically treating the solid pyrolysis residues to separate a coarse fraction and a fine fraction;
- feeding the coarse fraction into a liquid slag contained in a metal bath reactor, the metal bath reactor also containing a metal bath on which the liquid slag floats;
- entraining the fine fraction in a carrier gas and introducing the entrained fine fraction and the carrier gas via a nozzle into the metal bath contained in the metal bath reactor in order to carburize the metal bath;
- discharging offgases from the metal bath reactor and heating a combustion gas with the discharged offgases to form hot combustion gas;
- feeding the hot combustion gas and the pyrolysis gas into the metal bath reactor and burning the pyrolysis gas with the hot combustion gas via burners opening into a space within the metal bath reactor, the space being positioned above the liquid slag and the hot combustion gases comprising at least one member selected from the group consisting of air and oxygen;
- and
- smelting and heating the liquid slag with at least a portion of the pyrolysis gas.
Dependencies are inferred from the claim text.