Method of reducing atmospheric ammonia in livestock and poultry containment facilities

Abstract

Methods are provided for the treatment of livestock or poultry confinement facilities equipped with manure collection zones (e.g., a manure pit or litter), in order to reduce and mitigate the effects of gaseous ammonia within the facility. The treatment involves application of an aqueous mixture including a partial calcium salt of a maleic-itaconic copolymer and a partial ammonium salt of a maleic-itaconic copolymer. Preferably, the amount of the partial calcium salt copolymer is greater than the amount of the partial ammonium salt copolymer. The treatment methods provide prompt and lasting reductions in gaseous ammonia within the confinement facility.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention is directed to methods for treating livestock or poultry confinement facilities equipped with manure collection zones, such as pits or litter accumulations, to reduce and mitigate the effects of gaseous ammonia within the facility and thereby lessen the deleterious effects of ammonia on the livestock or poultry within the facility. More particularly, the invention is concerned with such methods wherein an aqueous treatment material comprising a partial calcium salt of a maleic-itaconic copolymer in combination with a partial ammonium salt of a maleic-itaconic copolymer. Such treatments promptly reduce the gaseous nitrogen content within the confinement facilities, and maintain such reductions over a significant period of time.

Description of the Prior Art

Ammonia is a common by-product of animal waste due to the often inefficient conversion of feed nitrogen into animal product. Livestock and poultry are often fed high-protein diets, which contain surplus nitrogen in order to assure that the animals' nutritional requirements are met. Nitrogen that is not metabolized into animal protein is secreted in the urine and feces of livestock and poultry, where further microbial action release ammonia into the air during manure decomposition.

Ammonia is typically considered an indoor air quality concern by poultry and livestock producers, because the gas accumulates inside poorly ventilated and/or managed animal confinement facilities. Elevated levels of nitrogen can have a negative impact on animal health and production, resulting in increased susceptibility of birds to bacterial respiratory infection, and decreased weight gains, feed conversions. Similarly, other livestock suffer under elevated ammonia conditions within a confinement facility.

Producers have adopted a number of strategies to lessen ammonia levels within confinement facilities, especially in cases of poultry coops or houses. Thus, it is known that a variety of amendments including aluminum sulfate (alum), ferrous sulfate, phosphoric acid, and other proprietary products may be sprayed or otherwise applied to the poultry litter. In the case of manure pits beneath livestock barns or houses, producers have principally relied upon ventilation to reduce ammonia levels. However, these methods have not completely solved the ammonia problems inherent in animal confinement facilities.

Specialty Fertilizer Products, LLC, of Leawood, Kans. (SFP), has heretofore commercialized a series of maleic-itaconic copolymers principally for use with solid or liquid ammoniacal or phosphate fertilizers, such as urea or UAN fertilizers, in order to significantly increase the performance of the fertilizers as evidenced by increased yields.

These prior products include Nutrisphere-N® for Liquid Nitrogen Fertilizers, which is a partial calcium salt of a maleic-itaconic copolymer in water with a solids content of at least 30% w/w, and more preferably about 40% w/w. The copolymer is formulated using equimolar amounts of maleic and itaconic moieties. The final product has a pH of 1-2 and is a light brown to yellow viscous liquid.

Another such product is AVAIL® for Liquid Phosphate Fertilizers is a partial ammonium salt of a maleic-itaconic copolymer in water with a solids content of at least 30% w/w, and more preferably about 40% w/w. The copolymer is formulated using equimolar amounts of maleic and itaconic moieties. The final product has a pH of about 2 and is also a light brown to yellow viscous liquid.

SFP has also previously commercialized a manure nutrient manager product under the trademarks More Than Manure® or MTM®, which is primarily designed to reduce phosphorous lock-up and nitrogen loss when applied to manure in an open-air pit or lagoon, or directly onto litter after field application of the litter. MTM® is an aqueous mixture made up of two-thirds by volume Nutrisphere-N® for Liquid Nitrogen Fertilizers and one-third by volume of AVAIL® for Liquid Phosphate Fertilizers, having a solids content of from about 30-60% w/w, a pH of about 3 and a specific gravity of from about 1.1-1.4. Other benefits of the MTM® product include increased crop rotation flexibility, biodegradability, and reduction of manure solids. In such prior uses of MTM®, no odor-reduction studies were conducted, but numerous MTM® users expressed the opinion of a notable reduction of odor from the use of the product.

SUMMARY OF THE INVENTION

It has now been discovered that gaseous nitrogen levels in livestock and poultry confinement facilities can be promptly and significantly reduced for marked time periods by applying an effective amount of a treatment composition to manure within or directly below the facility. Such animal or poultry confinement facilities include upright walls forming an enclosure, a manure collection zone within or below the enclosure, and a roof substantially covering the zone. Examples of such facilities are dairy and hog farrowing, finishing, and calving barns, and poultry coops, barns, and houses. In some instances, the facilities include a manure pit directly below the roof and enclosure, while in others the facilities have a floor covered in litter, which is mixed with animal manures. Usually, the liquid material is applied directly to manure within a pit by simply pouring the product into the manure mass. In the case of litter/manure mixtures, the product is normally sprayed onto the mixture.

The treatment material comprises an aqueous mixture including a partial calcium salt of a maleic-itaconic copolymer and a partial ammonium salt of a maleic-itaconic copolymer. The product typically has a pH of from about 1-5, more preferably from about 2-4. Actual test results confirm very significant reductions in gaseous ammonia within treated livestock or poultry confinement facilities, with a single application lasting for several weeks.

The fact that the treating materials methods of the invention can reduce ammonia levels withing confinement facilities so rapidly and effectively is quite surprising, because no known prior treatment can achieve such results.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The Partial Salt Maleic-Itaconic Copolymers and the Treating Materials

The preferred maleic-itaconic copolymers useful in the invention are described in U.S. Pat. Nos. 6,515,090 and 8,043,995 fully and completely incorporated by reference herein. In general, the copolymer salts should each desirably contain from about 10-90% by weight maleic moieties (more preferably from about 25-75% by weight), and correspondingly from about 90-10% by weight itaconic moieties (more preferably from about 75-25% by weight). Overall, each of the copolymer salts should include at least about 85% by weight of maleic and itaconic moieties, and more preferably at least about 93% by weight. Accordingly, the copolymer salts may also contain other moieties apart from maleic and itaconic moieties, such as vinyl moieties. However, such other moieties should be present only up to a level of about 15% by weight, more preferably up to about 7% by weight. Preferably, each of the copolymer consists essentially of maleic and itaconic moieties. One particularly preferred class of copolymer salts are the SFP AVAIL® and Nutrisphere-N® products described previously, which are formed using substantially equimolar amounts of maleic and itaconic moieties.

Most preferably, each of said partial salt copolymers has the generalized formula

where some of said X cations are H, and others of said X cations are Ca in the case of the partial calcium salt copolymer and ammonium in the case of the partial ammonium salt copolymer, and p ranges from about 10-50.

The partial calcium salt copolymer initially (i.e., before mixing with the partial ammonium salt copolymer) should have a pH of from about 1-4; likewise, the partial ammonium salt copolymer initially should have a pH of from about 1-4. The most preferred initial pH level for both salt copolymers should be about 1-2.

The complete treating materials should preferably contain at least about 30-60% by weight of total copolymer solids derived from both of the partial salt copolymers (more preferably from about 35-50% by weight solids), and from about 40-70% by weight water (most preferably from about 50-65% water). However, the treating materials may also include other ingredients apart from the two partial salt copolymers and water, such as pH adjustment agents, buffering agents, preservatives, and emulsifiers. Any such other ingredients are preferably used at a minor level, e.g., from about 1-10% by weight. The pH of the complete treating materials should be acid, preferably from about 1-5, more preferably from about 2-4.

Preferably, the calcium partial salt copolymer solids should be present in the complete treating materials in an amount greater than the amount of the ammonium partial salt copolymer solids therein. That is, taking the total weight of both copolymer salt solids as 100% by weight, the calcium partial salt copolymer solids should be present at a level of from about 50-80% by weight (more preferably from about 55-75% by weight, and most preferably from about 60-65% by weight), and the ammonium partial salt copolymer solids should be present at a level of from about 20-50% by weight (more preferably from about 25-45% by weight, and most preferably from about 35-40% by weight).

The single most preferred formulation useful in the context of the invention is the previously described MTM® product.

The Preferred Uses of the Treating Materials

Application of the dual partial salt copolymer materials of the invention is quite straightforward. In the case of manure collection pits, the material need only be poured onto the top of the manure and will quite readily spread and diffuse throughout the mass of the manure to promptly reduce the amount of gaseous nitrogen generated and maintained within the confinement facility. In the case of dairy or poultry barns having floor structures with litter and manure atop or mixed with the litter, the treating material is advantageously sprayed onto the top of the litter-manure mixture, with or without mixing. Here again, the action of the treating material is quite prompt and long-lasting.

Generally, the treating mixtures are used at a level of from about 0.005-3 gallons of the material per ton of manure, more preferably from about 0.01-2.5 gallons/ton, still more preferably from about 0.02-1 gallon per ton, and most preferably from about 0.03-0.035 gallon per ton.

Almost immediately upon application of the treating material to the manure, the amount of gaseous ammonia within the confinement facility is perceptibly lowered, and such reduction persists for a considerable time. Generally, the prevailing amount of gaseous ammonia should be reduced by at least about 50% (more preferably at least about 60%) within 24 hours after application. A single treatment also preferably serves to maintain at least about a 30% gaseous ammonia reduction (more preferably at least about 40%) for at least about 14 days (more preferably at least about 21 days).

EXAMPLES

The following examples describe preferred methods in accordance with the invention. It should be understood, however, that these examples are provided by way of illustration only, and nothing therein should be considered a limitation upon the overall scope of the invention.

In these examples, the “treatment” was the preferred MTM® treating agent described above. The ammonia measurements were made using meters having an average data point entry every 10 seconds, and the time in minutes listed in the tables refers to the total time of each reading at multiple points. For example, a reading of “15 mins., 2 points” means that there were two separate measurements at different points, each measurement being over a period of 7.5 minutes. The results of the multiple-point measurements were then averaged to give the reported ammonia levels.

In certain of the examples, the amount of treatment agent is recited as “ounces per acre.” This is based upon the manufacturer's recommendation of usage, according to the following equation:(amount of manure in gallons)/(number of acres to be fertilized with the treated manure)×(18 oz. of MTM®)/(128 oz./gallons)=gallons of MTM® to add to the manure

Example 1

In this test, a poultry layer house was treated having approximately 300 tons of litter in the house basement. The litter was treated with 25 gallons of the preferred liquid mixture, which was incorporated into the litter using a composting tractor with a sprayer mounted on the front and supporting a rear tank containing the mixture diluted with 75 gallons of water. Gaseous ammonia levels were determined prior to application of the treatment mixture on Days 1 and 3, on the day of treatment (Day 4), and thereafter on Days 5, 10, 11, and 12. Ammonia measurements were made at the exhaust fan and in the basement, with each measurement being taken three times and averaged. The following are the test results.

Day	Location/Temp	Treatment	Ammonia ppm
1	exhaust 68° F.	None	22.8
1	exhaust 68° F.	None	55.3
3	exhaust 50° F.	None	85.4
3	exhaust 50° F.	None	84.8
1	basement	None	17.7
1	basement	None	55.3
3	basement	None	172.8
3	basement	None	116.7
4	exhaust 27° F.	treated	8.6
4	exhaust 50° F.	treated	32
4	basement	treated	19.1
4	basement	treated	30.5
5	exhaust 55° F.	treated	15.6
5	basement	treated	17.1
10	exhaust 55° F.	treated	6.8
10	exhaust 73° F.	treated	8.4
10	basement	treated	10.9
10	basement	treated	18.6
11	exhaust 61° F.	treated	15.53
11	exhaust 77° F.	treated	10.1
11	basement	treated	10.1
11	basement	treated	11.8
12	exhaust 59° F.	treated	13.8
12	basement	treated	19.9

Example 2

A hog-finishing house having a manure pit with a 250,000 gallon capacity was treated using 18 ounces of the preferred treatment per acre of ground to be fertilized using the treated manure. The treatment was poured onto the top of the manure in the pit, and ammonia readings were taken at the pit exhaust fan prior to and after treatment. The following results were recorded.

Day	Treatment	Ammonia ppm
1	none	75
1	treated	33
(one hour after
treatment,
2 readings
averaged)
7	treated	10
15	treated	7
18	treated	5

Example 3

A slatted dairy barn with corn cob bedding was treated with the preferred treatment. The manure pit had a 1.2 gallon capacity, and the treatment was applied at 18 ounces per acre (213 acres @ 5600 gallons per acre. Ammonia readings were taken inside the barn at multiple points.

			Ammonia ppm
Day	Details/Location	Treatment	(readings averaged)
1	within barn, 2 points, 15 mins.	none	33.0
2	within barn, 2 points, 15 mins.	none	31.4
2	within barn, 2 points, 15 mins.	treated	26.1
3	within barn, 4 points, 40 mins.	treated	22.5
8	within barn, 4 points, 40 mins.	treated	19.2
28	within barn, 8 points, 60 mins.	treated	15.6
41	within barn, 8 points, 60 mins. *	treated	1.3
* 20 loads of manure were removed prior to the readings

Example 4

A hog-finishing barn with the manure pit at capacity, was treated using the preferred treatment at 18 ounces per acre.

			Ammonia
Day	Details/Location/Temperature	Treatment	ppm
1	exhaust fan, 4 points, 15 mins., 75° F.	none	18
2	exhaust fan, 4 points, 15 mins., 61° F.	treated	9.25
4	exhaust fan, 4 points, 15 mins., 83° F.	treated	8
8	exhaust fan, 4 points, 15 mins., 72° F.	treated	8.1

Example 5

A hog finishing barn having a manure pit at 75% capacity was treated at a rate of 18 ounces per acre.

Day	Details/Location/Temp	Treatment	Ammonia ppm
1	exhaust fan, 4 points, 15 mins, 63° F.	none	7.5
2	exhaust fan, 4 points, 15 mins, 61° F.	treated	8.25
4	exhaust fan, 4 points, 15 mins, 80° F.	treated	3.16
8	exhaust fan, 4 points, 15 mins, 67° F.	treated	4.5

Example 6

A hog barn having a manure pit with a 300,000 gallon capacity which was 25% full was treated at a rate of 18 ounces per acre (10 gallons). Before and after treatment, multiple readings were taken inside and outside the barn and averaged, giving the following results.

Day	Details/Location	Treatment	Ammonia ppm
1	inside barn, 2 points, 10 mins.	none	22.6
2	inside barn, 2 points, 10 mins.	none	44
3	inside barn, 2 points, 10 mins.	treated	32.4
8	inside barn, 2 points, 10 mins.	treated	12.4
15	inside barn, 2 points, 10 mins.	treated	10.0
19	inside barn, 6 points, 40 mins.	treated	15.2
28	inside barn, 4 points, 20 mins.	treated	20.1
2	outside barn, 2 points; 15 mins.	none	87.1
2	outside barn, 2 points; 15 mins.	treated	51.8
3	outside barn, 2 points; 15 mins.	treated	30.7
8	outside barn, 2 points; 15 mins.	treated	12.6
15	outside barn, 2 points; 15 mins.	treated	2.5
19	outside barn, 4 points; 15 mins.	treated	49.8
28	outside barn, 4 points; 15 mins.	treated	9.3
38	outside barn, 4 points; 15 mins.	treated	9.3

Example 7

In this example, a hog finishing barn having separate east and west pits was treated at a level of 18 ounces per acre. The results are as follows:

Day	Details/Location	Treatment	Ammonia ppm
1	exhaust fan, 3 points, 15 mins., west half	none	36
1	exhaust fan, 3 points, 15 mins., west half	treated	19
7	exhaust fan, 3 points, 15 mins., west half	treated	18
18	exhaust fan, 3 points, 15 mins., west half	treated	24
1	exhaust fan, 3 points, 15 mins., east half	none	36
1	exhaust fan, 3 points, 15 mins., east half	none	43
7	exhaust fan, 3 points, 15 mins., east half	none	48
18	exhaust fan, 3 points, 15 mins., east half	none	51
1	exhaust fan, 3 points, 15 mins., east half	none	17
1	exhaust fan, 3 points, 15 mins., east half	treated	15
7	exhaust fan, 3 points, 15 mins., east half	treated	16
18	exhaust fan, 3 points, 15 mins., east half	treated	16

Example 8

In this example, the manure pit of a hog finishing barn was treated at a rate of 18 ounces per acre, giving the following results.

Day	Details/Location/Temp	Treatment	Ammonia ppm
1	inside barn, 2 points, 15 mins., 54° F.	none	10.2
8	inside barn, 2 points, 15 mins., 44° F.	treated	4.5
1	exhaust fan, 3 points, 15 mins., 54° F.	none	15.1
8	exhaust fan, 3 points, 15 mins., 44° F.	treated	7.2

Example 9

In this example, another hog finishing barn was treated at a rate of 18 ounces per acre.

Day	Details/Location/Temp	Treatment	Ammonia ppm
1	inside barn, 2 points, 15 mins., 28° F.	none	6.1
14	inside barn, 2 points, 15 mins., 26° F.	treated	1.9
1	inside barn, 3 points, 15 mins., 28° F.	none	8.2
14	inside barn, 3 points, 15 mins., 26° F.	treated	2.3

Example 10

In this test, a hog finishing barn having a manure pit of 300,000 gallons at 85% capacity was treated with 10 gallons of the treatment, yielding the following results.

Day	Details/Location	Treatment	Ammonia ppm
1	exhaust fan, 2 points, 10 mins.	none	26.5
1	exhaust fan, 2 points, 10 mins.	treated	20
1	exhaust fan, 2 points, 10 mins.	treated	19
7	exhaust fan, 4 points, 10 mins.	treated	12

Example 11

In this instance, a dairy barn was treated having no pit. Rather, the preferred treatment was applied using a backpack sprayer at a level of 18 ounces per acre, diluted in 15 gallons of water. The ammonia levels were then tested at various locations in the barn, with the following results.

Day	Details/Location	Treatment	Ammonia ppm
1	gutter	none	17
1	gutter	treated	12
1	gutter	treated	9
1	east end	none	12
1	east end	treated	9
1	east end	treated	6
1	middle	none	9
1	middle, immediately after	treated	7
	treatment
1	middle, 2 hours after treatment	treated	6
1	west end	none	9
1	west end	treated	6
1	west end	treated	0

Example 12

In this test, a small scale (25′×25′) chicken coop was treated. The coop had housed chickens through the winter and had about 1.5 feet of manure with no bedding. The treating agent was sprayed onto the manure bed using 36 ounces of the preferred treatment diluted with 2 gallons of water, followed by additional water over the bed to ensure saturation.

Day	Details/Location	Treatment	Ammonia ppm
1	room average	none	23.7
1	room average	none	40.9
9	room average	treated	3.5
14	room average	treated	10.5
21	room average	treated	10.5

Example 13

In this test, a calving barn was treated using the preferred treatment at a rate of 17 ounces per acre with water, using a backpack sprayer. The results are as follows.

Day	Details/Location/Temp.	Treatment	Ammonia ppm
1	adjacent office 34° F.	none	1.3
1	adjacent office 34° F.	treated	0.8
1	barn, 1° F.	none	3.8
1	barn, 1° F.	treated	0.3

Example 14

In this example, the producer had three hog farrowing barns, two of which were treated at a level of 18 ounces per acre.

Day	Details/Location	Treatment	Ammonia ppm
1	average of 3 barns	none	22.4
1	average of the 2 treated barns	treated	13.9

Example 15

In this test, 2 hog finishing barns, each with a manure pit filled to 25% capacity, were treated at a level of 18 ounces per acre. The manure had a heavy crusting and fly infestation.

Day	Details/Location/Barn 1	Treatment	Ammonia ppm
1	exhaust fan	none	14.2
1	right side of barn	none	6.7
1	left side of barn (no air movement)	none	88.4
1	exhaust fan, 30 mins. after treatment	treated	10.7
1	right side of barn	treated	5.1
1	left side of barn (no air movement)	treated	67.0

Day	Details/Location/Barn 2	Treatment	Ammonia ppm
1	exhaust fan	none	34.2
1	right side of barn	none	13.0
1	left side of barn	none	19.2
1	exhaust fan, 30 mins. after treatment	treated	22.6
1	right side of barn	treated	7.8
1	left side of barn	treated	10.5

Example 16

In this example, a hog confinement building with a manure pit containing 100,000 gallons of manure was treated at a level of 18 ounces per acre.

Day	Details/Location	Treatment	Ammonia ppm
1	exhaust fan	none	7
1	exhaust fan after treatment	treated	6
1	exhaust fan, 3 hours after treatment	treated	0

Example 17

In this example, a hog finishing barn was treated at a level of 18 ounces per acre.

Day	Details/Location	Treatment	Ammonia ppm
1	average of 2 exhaust fans	none	71.8
2	average of 2 exhaust fans	treated	6.0

Example 18

In this example, a producer treated the manure pits of 2 hog finishing barns at a level of 18 ounces per acre.

Day	Details/Location	Treatment	Ammonia ppm
1	average of 2 exhaust fans	none	34.6
1	average of 2 exhaust fans, after treatment,	treated	12.2
	15 mins. between measurements
1	average of 2 exhaust fans, one hour after	treated	8.7
	application

Claims

1. A method of treating a livestock or poultry confinement facility to reduce and mitigate the effects of gaseous ammonia within the facility, said facility having a manure collection zone, upright walls forming an enclosure, and a roof substantially covering said zone, said method comprising the step of applying a treatment material to said manure within said zone in an amount of from about 0.005-3 gallons of said material per ton of manure and effective to lower the concentration of gaseous ammonia within said facility, said material comprising an aqueous mixture including a partial calcium salt of a maleic-itaconic copolymer and a partial ammonium salt of a maleic-itaconic copolymer, said material having a pH of from about 1-5.

2. The method of claim 1, said collection zone comprising a manure pit, and applying step comprising the step of pouring said treatment material into the pit.

3. The method of claim 1, said collection zone comprising a floor structure having litter thereon, with said manure mixed with the litter, said applying step comprising the step of spraying said material onto the manure-litter mixture.

4. The method of claim 1, said level being from about 0.01-2.5 gallons of the material per ton of manure.

5. The method of claim 1, said pH being from about 2-4.

6. The method of claim 1, said material comprising from about 40-80% by weight of partial calcium salt copolymer solids, and from about 20-60% by weight of said partial ammonium salt copolymer solids, with the total amount of the solids taken as 100% by weight.

7. The method of claim 6, said material comprising from about 55-75% by weight of said partial calcium salt copolymer solids and from about 25-45% by weight of said partial ammonium salt copolymer.

8. The method of claim 1, each of said partial salt copolymers having at least about 85% by weight of maleic and itaconic moieties therein.

9. The method of claim 8, each of said partial salt copolymers having at least about 93% by weight of maleic and itaconic moieties therein.

10. The method of claim 9, each of said partial salt copolymers consisting essentially of maleic and itaconic moieties.

11. The method of claim 1, each of said partial salt copolymers comprising from about 10-90% maleic moieties and from 90-10% itaconic moieties.

12. The method of claim 11, each of said partial salt copolymers having substantially equimolar amounts of said maleic and itaconic moieties.

13. The method of claim 1, said material having a solids content of from about 30-60% by weight.

14. The method of claim 1, each of said partial salt copolymers having the generalized formula

15. The method of claim 1, said confinement facility selected from the group consisting of dairy, hog, calving, farrowing, and finishing barns, and poultry coops and barns.

16. The method of claim 1, said treating material serving to reduce the amount of gaseous ammonia within said confinement facility by a level of at least about 50% within 24 hours after said application.