Manufacturing of bioorganic-augmented high nitrogen-containing inorganic fertilizer
First Claim
1. A method of manufacturing a fertilizer comprising:
- mixing and heating an organic sludge with a force sufficient to produce a thixotropic paste in a first mixer;
separately mixing acid with ammonia to produce an acidic mixture;
acidifying the thixotropic paste with the acidic mixture to produce an acidic paste in the first mixer, wherein the acidified thixotropic paste is heated to a temperature exceeding 44°
C. and has a pH of less than 5.5;
blending the acidic paste and a heated inorganic fertilizer melt comprising an ammonium salt, while maintaining a temperature over 85°
C. in a second mixer, wherein the ammonium salt is produced separate from the production of the fertilizer and the melt is maintained at a temperature over 177°
C.;
mixing a pH control agent and a hardening agent with the acidic paste to produce the fertilizer in a third mixer, wherein the fertilizer has a pH of between 5.0 and 7.0; and
regulating the pressure within the mixers;
removing water from the fertilizer.
18 Assignments
0 Petitions
Accused Products
Abstract
The invention describes a new method for the production of high nitrogen organically-augmented inorganic fertilizer that incorporates municipal biosolids or organic sludges that can compete with traditional fertilizers such as ammonium phosphate, ammonium sulfate and urea on the commodity fertilizer marketplace. The method creates a thixotropic paste-like material from the biosolids or organic sludge that is blended with hot or molten ammonium salts, especially a mixture of ammonium phosphate and ammonium sulfate. The invention can be an add-on to commercial production of ammonium salts or it can stand alone by manufacturing ammonium salts prior to their introduction to the conditioned biosolids. The invention is oriented to be tailored to production facilities for individual municipal waste treatment plants in order to keep manufacturing plants small with a minimization of logistics and liability.
185 Citations
50 Claims
-
1. A method of manufacturing a fertilizer comprising:
-
mixing and heating an organic sludge with a force sufficient to produce a thixotropic paste in a first mixer; separately mixing acid with ammonia to produce an acidic mixture; acidifying the thixotropic paste with the acidic mixture to produce an acidic paste in the first mixer, wherein the acidified thixotropic paste is heated to a temperature exceeding 44°
C. and has a pH of less than 5.5;blending the acidic paste and a heated inorganic fertilizer melt comprising an ammonium salt, while maintaining a temperature over 85°
C. in a second mixer, wherein the ammonium salt is produced separate from the production of the fertilizer and the melt is maintained at a temperature over 177°
C.;mixing a pH control agent and a hardening agent with the acidic paste to produce the fertilizer in a third mixer, wherein the fertilizer has a pH of between 5.0 and 7.0; and regulating the pressure within the mixers; removing water from the fertilizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
-
-
49. A method of manufacturing a fertilizer comprising:
-
dewatering an organic sludge; mixing and heating the dewatered organic sludge in a pressure vessel with a force sufficient to produce a thixotropic paste, wherein the temperature of the paste is maintained at or above 44°
C.;acidifying the thixotropic paste with a concentrated acid, wherein the acidified paste has a pH of less than 5.5; blending the acidic paste and a melt of an ammonium salt in one of three pressure vessels such that a first pressure vessel is filling, while a second pressure vessel is pressurizing and reacting, and while a third pressure vessel is emptying, wherein the three pressure vessels are operating concurrently and the temperature is maintained at 85°
C. or more and the pressure is maintained at 20 psig or more;mixing a pH control agent and a hardening agent with the blended acidic paste, wherein the pH is between 5.0 and 7.0; dewatering the blended acidic paste to form the fertilizer; forming granules of the fertilizer; and coating the granules with a chemical material to resist abrasion and dust generation. - View Dependent Claims (50)
-
Specification