Process and system for treatment of pig and swine manure for environmental enhancement

• US 5,885,461 A
• Filed: 02/07/1997
• Issued: 03/23/1999
• Est. Priority Date: 02/07/1997
• Status: Expired due to Term

• Current Assignee: Purin-Pur Incorporated
• Original Assignee: Purin-Pur Incorporated
• Inventors: Grandbois, Denys, Tetrault, Madeleine
• Primary Examiner(s): FORTUNA, ANA M
• Application Number:
  US08/807,255
• Time in Patent Office: 774 Days
• Field of Search: 210/650, 210/651, 210/652, 210/768, 210/732, 210/605, 210/609, 210/767, 210/770, 210/774, 210/606, 210/603, 210/805, 210/641
• US Class Current: 210/652
• CPC Class Codes: B01D 2311/04 Specific process operations in the feed stream; Feed pretreatment
• CPC Class Codes: B01D 2311/12 Addition of chemical agents
• CPC Class Codes: B01D 2311/2607 Application of a magnetic field
• CPC Class Codes: B01D 2311/2649 Filtration
• CPC Class Codes: B01D 61/025 Reverse osmosis; Hyperfiltration
• CPC Class Codes: B01D 61/027 Nanofiltration
• CPC Class Codes: B01D 61/04 Feed pretreatment
• CPC Class Codes: C02F 1/441 by reverse osmosis
• CPC Class Codes: C05F 3/00 Fertilisers from human or animal excrements, e.g. manure
• CPC Class Codes: Y02A 40/20 Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
• CPC Class Codes: Y02P 20/145 the feedstock being materials of biological origin

Abstract

A low cost efficient method and system for treating animal waste and in particular pig and swine solid and liquid manure to allow removable of undesirable odors and return of sludge and liquid safely to the environment to eliminate or reduce pollution. The method and system include collecting the manure into a central tank and using a continuous process to compress the manure to separate liquid from the solid sludge and transferring the separated liquid to a separate holding tank. The dried out sludge is collected as a residual and can be safely returned to the environment. Calcium carbonate may be added to the residual sludge to reduce odor. A polymer may be added to the pressing stage of the sludge to enhance liquid sludge separation. The separated liquid is then treated with a pressure filter membrane to remove undesirable elements from the liquid after which is filtered and is returned safely to the environment either to a natural stream to a sewage system or for agricultural uses.

Claims

1. The method for treating pig and swine liquid and solid manure to provide a residual dewatered sludge that can be safely returned to the environment for agriculture use and water that can be safely returned to the environment consisting of the steps of:

(a) collecting pig and swine combined liquid and solid manure to a single holding area;

(b) compressing the collect pig and swine liquid and solid manure to remove water from the manure;

(c) separating the water resulting from compressing the manure from the dewatered sludge;

(d) transferring the separated water from the dewatered sludge into a holding device;

(e) collecting the residual dewatered sludge in a predetermined area;

(f) returning the residual dewatered sludge to the environment;

(g) filtering the water removed and separated from the dewatered sludge through a nano filtration device and reverse osmosis device under high pressure creating a filtered stream of water and an unfiltered residual stream of water;

(h) collecting said filtered stream of water in a holding area;

(i) returning said filtered water to the environment where it is safe for agricultural purposes and disposal in a sewage system; and

(j) returning said unfiltered residual stream of water back to said single holding area containing the collected pig and swine combined liquid and solid manure.

2. A method as in claim 1 including the step of:

(a) adding polymer to the sludge as it is being compressed for removing water to enhance the water separation.

3. The method for treating pig and swine manure as in claim 2, including the step of:

(a) adding calcium carbonate to the residual sludge dried residue after it has been dewatered to reduce odor.