Process to beneficiate heat-dried biosolid pellets
First Claim
1. A method for the manufacture of a fertilizer comprising:
- mixing an oxidant with dewatered biosolids to control odor;
acidifying the oxidized and dewatered biosolids with concentrated acid to disinfect the biosolids;
blending the acidified biosolids into a thixotropic mixture;
subjecting the thixotropic mixture to an increased atmospheric pressure;
adding an inorganic plant nutrient to the thixotropic mixture;
mixing granulating agents into the mixture; and
drying the mixture to greater than 90% solids to produce a beneficiated, dried-biosolids fertilizer.
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Accused Products
Abstract
This invention is directed to systems, devices and methods to beneficiate heat-dried biosolids or sludge pellets or granules as presently manufactured by municipalities or companies from a) dewatered municipal wastewater biosolids or sludges within the municipal wastewater treatment plant heat-dried biosolids production facility or from b) finished dry heat dried biosolids pellets or granules in a separate manufacturing facility from the municipal wastewater treatment plant to produce a fertilizer containing sufficient organic and inorganic plant nutrients to be valuable and saleable into the commercial agricultural industry. The present invention describes beneficiation methods to increase the plant nutrient content of the fertilizer and also to reduce the odors associated with traditionally-produced heat dried biosolids.
191 Citations
21 Claims
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1. A method for the manufacture of a fertilizer comprising:
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mixing an oxidant with dewatered biosolids to control odor; acidifying the oxidized and dewatered biosolids with concentrated acid to disinfect the biosolids; blending the acidified biosolids into a thixotropic mixture; subjecting the thixotropic mixture to an increased atmospheric pressure; adding an inorganic plant nutrient to the thixotropic mixture; mixing granulating agents into the mixture; and drying the mixture to greater than 90% solids to produce a beneficiated, dried-biosolids fertilizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for the manufacture of a fertilizer comprising:
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mixing an oxidant with dried biosolids to control odor; acidifying the oxidized and dried biosolids with concentrated acid; blending the acidified biosolids into a thixotropic mixture; subjecting the thixotropic mixture to an increased atmospheric pressure; adding an inorganic plant nutrient to the thixotropic mixture; and producing a beneficiated, dried-biosolids fertilizer. - View Dependent Claims (20, 21)
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Specification