Process and apparatus for manufacture of fertilizer products from manure and sewage
This invention discloses systems and methods for conversion of manure to novel fertilizer and/or soil builder products useful as input for organic farming operations. The equipment systems comprise a gas turbine generator unit (preferred heat source), a dryer vessel and a processing unit, wherein the connection between the gas turbine and the dryer vessel directs substantially all the gas turbine exhaust into the dryer vessel and substantially precludes the introduction of air into the dryer vessel. The dryer vessel receives the manure for contact with the turbine exhaust gases to convert the manure to a dry material, which is passed to the processing unit where it is formed into granules, pellets or other desired form for the final dry fertilizer product. The method comprises drying, heating and converting the manure to form novel self binding fertilizer and soil builder type products for organic farming and other uses.
1. A method of making a fertilizer product from manure feedstock comprising:
operating a gas turbine generator to produce electricity and exhaust gases;
contacting the exhaust gases with the manure feedstock having a moisture content of at least about 30% by weight, in a dryer vessel for a contact time sufficient to produce, without significant oxidation of the manure feedstock, a dried fertilizer material having a moisture content less than about 20% by weight; and
processing and forming the fertilizer material into a granular, pellet or prill form of fertilizer product suitable for conventional dry fertilizer application in a crop growing operation.
2. A method according to claim 1 wherein the manure feedstock comprises a moisture content of at least about 50% by weight.
3. A method according to claim 1 wherein the fertilizer material comprises a moisture content less than about 15% by weight.
4. A method of making a fertilizer or soil builder product comprising:
producing hot combustion exhaust gases from a gas turbine, oil or gas burner or reciprocating engine;
directing ventilation air from an animal shelter into the combustion air intake of the turbine, burner or engine;
contacting the hot combustion exhaust gases with a manure feedstock; and
drying the manure feedstock for a contact time sufficient to produce a dried fertilizer material.
5. A method according to claim 4 comprising contacting the exhaust gases with the manure feedstock in an enclosed system adapted to substantially prevent significant oxidation of the manure feedstock.