Method of freeze drying sewage sludge
AssigneeEnviro-Tech-2000, Inc.
InventorAlbert T. Mallia, Jr.
Life of this patent
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Abstract
A method for processing sewage eliminates chemical "treatment", or, the addition of chemicals that are as harmful or more so to the environment as raw sewage. The method of processing sewage disintegrates the generally solid components of sewage into a highly de-moisturized powder via alternative processes of either (i) a freeze-drying process, or (ii) a combination centrifugal separation and an evacuated "bake-out" process, both which substantially drive out the vaporizable components of the sewage. In consequence, there are no resultant effluent and/or exhausting vapors from this method which would impact the environment.
Claims13
A method for processing sewage which comprises generally solid components as well as generally vaporizable components, the method comprising the steps of:
- grinding an infeed of sewage into a liquid suspension;
- pumping the liquid suspension to boost a line pressure thereof;
- providing a freezing atmosphere;
- throttling the liquid suspension into the freezing atmosphere that is at a given freezing temperature chosen so that the throttled liquid suspension forms into icy granular particles;
- and then, to occur substantially close after the occurrence of that last step of throttling:
- drawing a vacuum over the icy granular particles and vaporizing the generally vaporizable components of the icy granular particles, which disintegrates the generally solid components into a freeze-dried, crumbly residue;
- exhausting the generally vaporizable components to a condenser;
- and,
- removing the freeze-dried residue.
A method for processing sewage which comprises generally solid components as well as vaporizable components, the method comprising the steps of:
- grinding an infeed of sewage into a liquid suspension;
- pumping the liquid suspension to boost a line pressure thereof;
- providing a freezing atmosphere;
- throttling the liquid suspension into the freezing atmosphere that is at a given freezing temperature chosen so that the throttled liquid suspension forms into icy granular particles;
- and then, to occur substantially close after the occurrence of that last step of throttling:
- drawing a vacuum over the icy granular particles and vaporizing the vaporizable components of the icy granular particles, which disintegrates the generally solid components into a freeze-dried, crumbly residue;
- exhausting the vaporizable components to a condenser for extracting a condensate from portions of the vaporizable components, and to extract the other portions of the vaporizable components, which were not condensed, for a given use chosen from one of generating heat and generating electric power;
- and,
- removing the freeze-dried residue.
Dependencies are inferred from the claim text.