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US 4,342,650 AGranted
Organic sludge-energy recycling method
OwnerLennart G. Erickson, Howard E. Worneinventors
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OwnerLennart G. Erickson, Howard E. Worneinventors
Estimating the term…
A method is described for converting substantially untreated organic sludge into useful substances. The sludge may include primary sludge, a mixture of primary and secondary sludges from municipal wastewater treatment facilities, slurries of agricultural manure, and other organic wastes. The sludge is mechanically comminuted to reduce the size of organic solids, the sludge is then further mechanically disintegrated and thereafter it is subjected to enzyme hydrolysis to produce a biologically stable colloidal slurry with improved biochemical potential reactivity. Typically, the hydrolysis step is followed by a further cell/particle disintegration step and a secondary hydrolysis step. If necessary, heavy metals are removed from the suspension in a chelating step which are recovered as a recyclable concentrate. The suspension can be used as a liquid fertilizer or it can be dewatered. If used as a liquid fertilizer the suspension can be inoculated with microalgae to enrich the fertilizer with nitrogen. Alternatively, the demineralized product may be incinerated or used as a feedstock for other industrial processing.
A method for converting substantially untreated organic sludge into a useful substance comprising the steps of disintegrating organic solids in the sludge into organic particulate matter;
A method for converting substantially untreated organic sludge into a useful substance comprising the steps of disintegrating organic solids in the sludge into particulate matter including viable organic cells to thereby form a disintegrated sludge;
A method for converting substantially untreated organic sludge from a wastewater treatment plant into a useful product comprising the steps of collecting a sludge residue from the plant;
A method for converting an substantially untreated organic sludge including raw animal manure into a useful product comprising the steps of disintegrating organic solids in the sludge to form a disintegrated sludge including particulate matter;
Dependencies are inferred from the claim text.