Method for Manufacturing Composition for Reducing Stench of Barn

Abstract

The present invention relates to a method for manufacturing a composition for reducing livestock barn odors that effectively removes odor components generated from livestock manure within the barn, thereby making the barn environment pleasant. The composition for reducing livestock barn odors manufactured by the method of the present invention is sprayed into the interior space of the barn to adsorb and remove odor components from the air, and after falling onto the barn floor, it decomposes and removes the odor components through fermentation, thereby effectively removing odors from the barn. Furthermore, the odor removal effect lasts for a long time, reducing the time and cost required for odor removal, and the treated manure can be usefully utilized as compost. Through this, a pleasant rearing environment for livestock and a high weight gain rate can be expected.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a composition for reducing livestock barn odors that effectively removes odor components generated from livestock manure within the barn, thereby making the barn environment pleasant. Background Technology

[0002] Generally, livestock manure discharged from farms is stored on-site rather than leaking externally and then sent to a manure treatment facility for processing. However, since most farms store the manure in open-air or outdoor storage areas without proper storage facilities, it emits large amounts of greenhouse gases and odors during storage, causing significant damage to the farms and the surrounding environment.

[0003] Representative greenhouse gases emitted from livestock manure include methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O). Among these, methane emissions account for a significant portion of the total greenhouse gas emissions from the agricultural sector and are known to have a major impact on global warming.

[0004] Representative major odor substances generated from livestock manure include ammonia, sulfur compounds, volatile fatty acids, indole, skatole, phenol, alcohol, and carbonyl. Undigested feed nutrients are produced by the fermentation of microorganisms in the large intestine, and the remainder is excreted as waste. These substances are generated by anaerobic microbial fermentation in manure storage tanks, and when different types of odors are mixed, they can cause a synergistic effect of odor and gas emissions.

[0005] In addition, odor components are known to have adverse effects on the growth of livestock as well as on the human body. For example, piglets are known to experience about 12% growth impairment at 50 ppm of ammonia, and suffocation accidents are frequent in pig farms.

[0006] Various physical, chemical, and biological methods are utilized to reduce the odor of livestock manure. Physical methods include adsorbents and ion exchange resin adsorption; chemical methods include water washing, chemical scrubbing, direct combustion, catalytic combustion, and ozone oxidation; and biological methods include microbial deodorization.

[0007] As a physical method, Korean Registered Patent Publication No. 1807242 discloses a composition of a dry powder-type odor remover for livestock, comprising: a mixed rock powder consisting of maifan stone powder, phyllite powder, and zeolite powder; and one or more cultured bacteria selected from the group consisting of yeast, lactic acid bacteria, Bacillus, photosynthetic bacteria, and actinomycetes. The composition can primarily remove odors within the livestock barn by adsorbing odors in the air generated from the livestock barn, and secondarily remove odors within the livestock barn by activated microorganisms after falling onto the barn floor.

[0008] As a chemical method, Korean Registered Patent Publication No. 1935966 discloses a livestock barn odor remover that sprays a cleaning solution into the odorous air inside a casing through which the odorous air is introduced and discharged, dissolves and removes water-soluble odor components contained in the odorous air, and then contacts it with a cooler to condense and separate the moisture containing the odor components. In this method, hydrogen sulfide and ammonia, which cause most odors, are effectively removed upon contact with the cleaning solution.

[0009] As a biological method, Korean Registered Patent Publication No. 0847905 discloses an odor remover for livestock barns comprising a mixed medium in which an ammonia-degrading microbial medium, a hydrogen sulfide-degrading microbial medium, and an organic matter-degrading microbial medium are uniformly mixed, an ammonia decomposition efficacy enhancer mixed with an enzyme and an oxygen generator, neem fruit extract, seaweed extract powder, and a moisture regulator. This promotes the nitrification of ammonia bacteria, thereby reducing various bacterial diseases such as skin diseases, respiratory diseases, and diarrhea in livestock, and as the amount of manure decreases, ammonia and hydrogen sulfide are reduced, thereby reducing odors. It also prevents the death of livestock, reduces manure treatment costs by utilizing composted manure in a natural circulation manner, and has the effect of lowering the biological oxygen demand (BOD).

[0010] As mentioned above, conventional methods for reducing livestock manure odors have involved methods such as adsorbing, deodorizing by washing, or removing by decomposition. However, these methods have problems such as requiring a long time to manufacture the odor remover, requiring continuous injection of the odor remover because it is only effective temporarily, and incurring high costs for construction, manufacturing, and maintenance of the treatment facility. The problem to be solved

[0011] The present invention aims to solve the above problems by providing a method for manufacturing a composition for reducing livestock barn odors that is easy to manufacture and can continuously exhibit an odor removal effect in livestock barns. means of solving the problem

[0012] To solve the above problem, the present invention provides a method for preparing a composition for reducing livestock barn odor, comprising the steps of: mixing 5 to 10 parts by weight of molasses with 100 parts by weight of water, inoculating 1 to 5 parts by weight of a mixed microorganism of Bacillus subtilis and yeast, and fermenting under anaerobic conditions at 30 to 40 ℃ for 2 to 5 days to prepare a microbial culture solution; crushing dolomite to produce dolomite powder; and mixing 30 to 50 parts by weight of dolomite powder with 100 parts by weight of the microbial culture solution, stirring, and drying; wherein the dolomite powder has an average particle size of 100 μm or more and a pore size of 3 nm to 200 μm, the size of the Bacillus subtilis has a diameter of 0.5 to 1.0 μm and the size of the yeast has 5 to 10 μm, and the Bacillus subtilis is inserted into the pores of the dolomite powder and bound by molasses, and the yeast is bound to the surface of the dolomite powder by molasses.

[0013] At this time, it is preferable to perform the drying at 80 to 100 ℃ for 5 to 15 minutes.

[0014] delete

[0015] In addition, after the drying step, it is preferable to add a step of crushing the dried material and filtering it through a filter mesh with a mesh size of 20 to 30 μm to remove the powder passing through the filter mesh and collecting the powder remaining on the filter mesh.

[0016] In addition, it is preferable that the above dolomite powder be manufactured by a process of mixing dolomite with water, wet grinding it, letting it stand for more than one month, and then filtering to remove the water, and it is preferable that the above dolomite powder be calcined at 900 to 1000 ℃ in a vacuum environment.

[0017] delete Effects of the invention

[0018] The composition for reducing livestock barn odors produced by the method of the present invention can effectively remove livestock barn odors by spraying it into the interior space of the livestock barn to adsorb and remove odor components in the air, and by decomposing and removing odor components through fermentation after falling onto the barn floor.

[0019] In addition, the odor removal effect lasts for a long time, which can reduce the time and cost required for odor removal. The treated manure can be effectively utilized as compost, thereby allowing for a pleasant rearing environment for livestock and high weight gain rates. Specific details for implementing the invention

[0020] The present invention involves mixing molasses with water and Bacillus subtilis ( Bacillus subtillus A microbial culture solution is prepared by inoculating and fermenting with yeast, and dolomite is crushed to prepare dolomite powder. Then, the microbial culture solution and the dolomite powder are mixed and stirred, and then dried to produce a composition for reducing livestock barn odors. The prepared composition is sprayed into the livestock barn to remove odors.

[0021] A microbial culture solution is prepared by mixing 5 to 10 parts by weight of molasses and 1 to 5 parts by weight of a mixture of Bacillus subtilis and yeast with 100 parts by weight of water and fermenting it under anaerobic conditions at 30 to 40°C for 2 to 5 days. Since Bacillus subtilis decomposes carbohydrates and proteins and yeast decomposes sugars to produce organic acids and alcohol, it decomposes carbohydrates and proteins remaining in livestock manure, thereby providing the effect of reducing the odor of livestock barns.

[0022] Bacillus subtilis is a Gram-positive bacillus with an optimal growth temperature of 28–40°C and is widely present in nature. It has antibacterial properties, inhibits the growth of harmful bacteria, produces carbohydrate and protein-degrading enzymes to decompose various organic substances, and has gas removal capabilities, which can reduce odor components in livestock barns.

[0023] Yeast is a unicellular fungus that, although varying depending on fermentation conditions, generally has high levels of protein, nucleic acids, and vitamins, and low levels of fat. It produces substrates necessary for the proliferation of other beneficial microorganisms, and beta-glucan, a component of the yeast cell wall, activates the immune systems of various animals and plants to enhance resistance against various pathogenic microorganisms.

[0024] Molasses is a byproduct remaining from the process of processing sugarcane and sugar beets into sugar. It is generally composed of 20–30% moisture, 60–70% sugar, 5–10% ash, and 5% other components. The sugar consists of 30–50% reducing sugar and 20–30% sucrose. Because it contains a large amount of sugar and is rich in various nutrients, Bacillus subtilis can be easily cultured.

[0025] Molasses is used as a nutrient source for the above-mentioned culture, and it is preferable to use a mixture of Bacillus subtilis and yeast in equal weight ratios.

[0026] Dolomite is a sedimentary carbonate rock composed of crystalline calcium magnesium carbonate CaMg(CO3)2, in which calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) form a double salt in a 1:1 ratio. Dolomite powder is produced by grinding it with a grinder such as a ball mill, basket mill, bead mill, or nano mill. At this time, it is preferable to grind the dolomite particles to a size of at least 100 μm in average particle size.

[0027] Dolomite is a porous rock having numerous pores on its surface, and when the composition for reducing livestock barn odors according to the present invention is sprayed into a livestock barn, odor components floating in the space of the barn can be removed by adsorbing them into the pores of the dolomite.

[0028] The main components causing the odor in livestock barns are ammonia (NH3) and hydrogen sulfide (H2S). Ammonia is produced when proteins in the body are broken down or when livestock excrement is composted, and because it is alkaline, it irritates biological tissues and can cause damage to skin tissues or organs if exposed for a long period. Hydrogen sulfide is a sulfide of hydrogen and is produced by the decomposition of sulfur-containing proteins; it smells like rotten eggs even at low concentrations and has a higher specific gravity than air, so it tends to stay on the ground. It is the main cause of the odor in livestock barns and, if inhaled, can affect the eyes, respiratory system, and nervous system, potentially causing disease.

[0029] It is known that if the pH of livestock manure is low, the volatilization of ammonia gas is reduced, and if the pH is high, the volatilization of hydrogen sulfide gas is reduced. Since dolomite exhibits alkalinity with a pH of approximately 9.1 to 9.2, although varying depending on crystallinity, spraying dolomite powder into livestock barns can further reduce the odor of hydrogen sulfide, which has a high odor intensity.

[0030] Next, a composition for reducing livestock barn odor is prepared by mixing and stirring the above-mentioned microbial culture solution and dolomite powder, and then drying. It is preferable to mix and stir 30 to 50 parts by weight of dolomite powder with 100 parts by weight of microbial culture solution and dry at a temperature of 80 to 100 ℃ for 5 to 15 minutes.

[0031] When a microbial culture solution is mixed with dolomite powder, the viscous molasses remaining in the microbial culture solution binds Bacillus subtilis, yeast, and dolomite particles, and when this is dried, a powder-form composition for reducing livestock barn odor is produced in which Bacillus subtilis, yeast, and dolomite particles are bound to each other through the molasses.

[0032] Yeast decomposes sugar into alcohol and carbon dioxide through fermentation, and since alcohol has antibacterial properties, there is a concern that it may inhibit the growth of Bacillus subtilis; however, since yeast dies at the above drying temperature and time while Bacillus subtilis does not, the odor removal effect of Bacillus subtilis is not hindered by yeast.

[0033] The pore size of carbonate rocks varies depending on the type, but ranges from 3 nm to 200 µm, and pores larger than 3 µm account for about 50%, while bacilli generally have a diameter of 0.5 to 1.0 µm and a length of 1.0 to 3.0 µm, and yeast has a diameter of 5 to 10 µm.

[0034] Therefore, when a microbial culture solution is mixed with dolomite powder, small-diameter rod-shaped bacteria such as Bacillus subtilis are mainly inserted into the pores of the carbonate rock dolomite particles and bound inside the pores by molasses, while relatively large yeasts are mainly bound to the surface of the dolomite particles.

[0035] The dried material of the above-mentioned Bacillus subtilis, yeast, and dolomite clumps together in a lump form due to the viscosity of molasses, so it is crushed and pulverized. When the dried material is crushed, the yeast that was bound to the surface of the dolomite particles is easily separated from the dolomite particles, and the Bacillus subtilis that was bound inside the pores of the dolomite particles is not separated from the dolomite particles.

[0036] Since the dolomite powder particles are crushed to an average particle size of 100 μm or more, they have weight and can be uniformly dispersed when sprinkled in a livestock barn, resulting in high adsorption efficiency for odor components floating in the internal space of the barn. Additionally, since Bacillus subtilis is bound inside the pores of the dolomite particles and is uniformly dispersed on the barn floor along with the dolomite powder, the decomposition efficiency of odor components is high.

[0037] Ammonia and hydrogen sulfide, which are the main malodorous components of livestock barns, are mainly produced by the decomposition of proteins, and since yeast cells are mainly composed of proteins, they decompose due to putrefaction bacteria in the barn floor or manure to produce nitrogen-based malodorous substances. Therefore, it is desirable to filter the mixed powder obtained by grinding the dried molasses, Bacillus subtilis, yeast, and dolomite powder through a filter mesh with a mesh size of 20 to 30 μm to remove yeast that is smaller than the mesh size and passes through the filter mesh, and to collect and spray only the dolomite powder that is larger than the mesh size and cannot pass through the filter mesh, in which Bacillus subtilis is bound by molasses inside the pores.

[0038] Dolomite powder removes odor components in livestock barns by adsorbing them into the pores; however, if Bacillus subtilis and molasses are inserted into the pores, the pore size may decrease or become clogged, potentially degrading the adsorption performance of the dolomite.

[0039] To prevent this, when grinding dolomite powder, it is desirable to mix the dolomite powder with water and wet grind it, then let it stand for at least one month, preferably at least three months, and then filter to remove the water.

[0040] When dolomite powder is immersed in water, the carbonate rock dolomite chemically reacts with water and dissolves, causing changes in porosity, pore size, and permeability. Micropores formed in the dolomite decrease and macropores increase. During the wet grinding process, this action is promoted, causing the pore size of the dolomite to increase, which can suppress the decrease in the adsorption performance of the dolomite caused by the insertion of Bacillus subtilis.

[0041] To further improve the adsorption performance of dolomite, it is desirable to calcine the dolomite powder at 900 to 1000 ℃, and it is even more desirable to calcine it in a vacuum environment.

[0042] When dolomite powder is calcined, magnesium carbonate (MgCO3), a component of dolomite, is first thermally decomposed at 750–800 ℃ by an endothermic reaction, releasing carbon dioxide and producing magnesium oxide (MgO), and then calcium carbonate (CaCO3), a component of dolomite, is thermally decomposed at 900–1000 ℃, releasing carbon dioxide and producing calcium oxide (CaO).

[0044] CaMg(CO3)2→CaO·MgO+2CO2

[0046] Micropores with a size of 15 to 25 nm are formed in the place where carbon dioxide has escaped from the dolomite, and since the size of Bacillus subtilis or yeast is larger than this, even if a microbial culture solution is mixed with dolomite powder, the microorganisms cannot be inserted into the micropores of the dolomite, so the micropores created by the release of carbon dioxide can adsorb the odor components of the livestock barn.

[0047] In addition, magnesium oxide and calcium oxide react with water to produce magnesium hydroxide and calcium hydroxide, and since magnesium hydroxide and calcium hydroxide are strongly alkaline, if a livestock barn odor reduction composition containing calcined dolomite powder is sprayed into a livestock barn, it reacts with the moisture in the barn floor and manure to exhibit strong alkalinity, thereby achieving the effect of suppressing the volatilization of hydrogen sulfide.

[0049] MgO + H2O → Mg(OH)2

[0050] CaO + H2O → Ca(OH)2

[0052] The composition for reducing livestock barn odors prepared as described above consists of 100 parts by weight of dolomite powder, 1 to 5 parts by weight of molasses remaining after fermentation, and 10 to 30 parts by weight of a mixed dried microorganism of Bacillus subtilis and yeast. Since Bacillus subtilis is bound inside the pores of the dolomite particles, when sprayed inside the livestock barn, the fine-sized Bacillus subtilis particles can be uniformly spread on the barn floor without scattering. Additionally, the molasses binding the Bacillus subtilis and the dolomite particles dissolves due to moisture contained in the barn floor and manure, thus not inhibiting the fermentation of Bacillus subtilis.

[0053] In addition, since the composition is in powder form, it can be sprayed into the interior of the livestock barn to adsorb and remove odor components from the air. After falling onto the barn floor, Bacillus subtilis decomposes carbohydrates and proteins remaining in livestock manure, thereby continuously exerting an odor removal effect. This also aids in the growth of livestock, offering the advantage of a pleasant rearing environment and the potential for high weight gain.

[0055] The present invention will be explained in more detail below based on the following examples, comparative examples, and test examples.

[0056] However, the following examples are merely for illustrating the present invention, and the present invention is not limited by the following examples. It will be obvious to those skilled in the art that the present invention can be modified by substitutions and equivalent alternative examples within the scope of the technical concept of the present invention.

[0058] <Example 1>

[0059] A microbial culture solution was prepared by mixing 100 kg of water, 7 kg of molasses, and 3 kg of microorganisms mixed with Bacillus subtilis and yeast in equal weight ratios, and fermenting it under anaerobic conditions at 35°C for 3 days.

[0060] Dolomite was ground in a ball mill for 70 hours to produce dolomite powder with an average particle size of 150 μm, then 40 kg of dolomite powder was mixed with 110 kg of the microbial culture solution and stirred, then dried with hot air at 90°C for 10 minutes, and the dried material was ground to produce a powdered composition for reducing livestock barn odor.

[0062] <Example 2>

[0063] The livestock barn odor reduction composition prepared in Example 1 above was filtered through a filter mesh with a mesh size of 25 μm to remove small-sized powder passing through the filter mesh and collect large-sized livestock barn odor reduction composition remaining on the filter mesh.

[0065] <Example 3>

[0066] In Example 1 above, a composition for reducing livestock barn odor was prepared in the same manner as in Example 1, except that 20 kg of dolomite was ground in a ball mill for 70 hours in 100 kg of water to prepare a dolomite aqueous dispersion with an average particle size of 150 μm, and then left to stand for 3 months, and subsequently, the dolomite aqueous dispersion was filtered through a filter mesh with a mesh size of 25 μm to prepare a dolomite powder from which water had been removed.

[0068] <Example 4>

[0069] In the above Example 1, a composition for reducing livestock barn odor was prepared in the same manner as in Example 1, except that the dolomite powder was calcined at 950°C in a vacuum environment of 50 kPa and mixed with a microbial culture solution.

[0071] <Comparative Example>

[0072] In the above Example 1, the microbial culture solution and dolomite powder were stored separately without mixing, and then used together according to the mixing ratio of Example 1 (microbial culture solution:dolomite powder = 11:4, by weight).

[0074] <Test Example> Measurement of odor in livestock barns

[0075] The livestock barn odor reduction compositions prepared in Examples 1 to 4 and Comparative Examples were sprayed once into the open air inside the livestock barn, and the concentrations of ammonia and hydrogen sulfide, which are representative odor components of the pig manure slurry pit, and the pH were measured immediately after spraying, 3 days later, 5 days later, 10 days later, and 15 days later, and are shown in Table 1 below.

[0076] Ammonia concentration and hydrogen sulfide concentration were measured using a gas detector (GV100S, GASTEC, Japan) and pH was measured using a pH meter (CH8603, Mettler-Toledo AG, UK), and a case in which the livestock barn odor reduction composition was not sprayed was compared with a control group.

[0078] Livestock barn odor measurement results Immediately after spraying 3 days later 5 days later 10 days later 15 days later Ammonia (ppm / 100ml) Example 1 28.2 3.6 3.8 4.3 5.1 Example 2 27.5 3.6 3.9 4.5 5.3 Example 3 25.8 3.4 3.6 4.1 4.8 Example 4 22.4 3.1 3.5 3.9 4.6 Comparative example 28.6 3.8 4.5 8.2 15.5 control group 35.1 35.4 34.8 35.6 36.2 Hydrogen sulfide (ppm / 100 ml) Example 1 1.8 1.2 1.3 1.3 1.2 Example 2 1.8 1.4 1.4 1.2 1.2 Example 3 1.7 1.2 1.3 1.2 1.3 Example 4 1.7 1.1 1.2 1.2 1.1 Comparative example 1.8 1.4 1.5 1.8 2.0 control group 2.2 2.4 2.1 2.1 2.4 pH Example 1 8.5 8.7 8.5 8.1 8.3 Example 2 8.4 8.5 8.3 8.3 8.4 Example 3 8.5 8.6 8.5 8.2 8.2 Example 4 9.0 9.3 9.0 8.6 8.5 Comparative example 8.4 8.6 8.3 8.3 8.4 control group 7.9 8.1 8.1 8.0 8.2

[0080] Looking at Table 1 above, the ammonia odor component remained at a constant level in the control group, but in the example, it showed a tendency to decrease slightly immediately after spraying the livestock barn odor reduction composition, then decrease rapidly, and then gradually increase. This is because it is judged that immediately after spraying, it is lowered due to the gas component adsorption effect of dolomite powder, and subsequently, the ammonia component is lowered by the fermentation of Bacillus subtilis in the microbial culture solution, and as time passes, it gradually increases as pig manure is added.

[0081] Among the examples, Example 4 showed the best ammonia removal effect. This is attributed to the fact that the dolomite particles adsorbed more ammonia by increasing the pore size of the dolomite particles through calcination in a vacuum environment. In the comparative example, the microbial culture solution and dolomite powder were sprayed separately. The dolomite powder was uniformly sprayed into the livestock barn by its own weight, allowing it to efficiently adsorb odor components floating in the internal space of the barn. Consequently, there was no significant difference from the examples immediately after spraying. However, the microbial culture solution was not sprayed uniformly, so it is believed that the odor reduction effect caused by Bacillus subtilis fermentation was not fully exerted.

[0082] The hydrogen sulfide odor component showed a trend similar to the ammonia odor component, and no distinct increase was observed over time.

[0083] The pH change shows a value of about 8 for the control group, and for the examples, it rises after firing and then gradually decreases. Among the examples, Example 4 is judged to have increased pH as magnesium oxide and calcium oxide produced by calcining dolomite powder react with moisture in the livestock barn floor and pig manure slurry to produce strong alkaline magnesium hydroxide and calcium hydroxide.

[0084] Overall, the ammonia concentration and hydrogen sulfide concentration of the example remained significantly low for 15 days after spraying the composition, indicating that the livestock barn odor reduction composition of the example maintains its effect for at least 15 days. Therefore, it is determined that spraying at 15-day intervals can maintain the odor of the livestock barn at a low level.

[0085] As shown in the comparative example, if the microbial culture solution and dolomite powder are sprayed separately without mixing, the effect of the composition for reducing livestock barn odor is shortened. Therefore, it can be seen that it is desirable to mix and dry the microbial culture solution and dolomite powder as in the example to ensure a uniform and continuous effect.

Claims

Claim 1 A method for preparing a composition for reducing livestock barn odor, comprising the steps of: mixing 5 to 10 parts by weight of molasses with 100 parts by weight of water, inoculating 1 to 5 parts by weight of a mixed microorganism of Bacillus subtilis and yeast, and fermenting under anaerobic conditions at 30 to 40 ℃ for 2 to 5 days to produce a microbial culture solution; crushing dolomite to produce dolomite powder; and mixing 30 to 50 parts by weight of dolomite powder with 100 parts by weight of the microbial culture solution, stirring, and drying; wherein the dolomite powder has an average particle size of 100 μm or more and a pore size of 3 nm to 200 μm, the size of the Bacillus subtilis has a diameter of 0.5 to 1.0 μm, and the size of the yeast has 5 to 10 μm, and the Bacillus subtilis is inserted into the pores of the dolomite powder and bound by molasses, and the yeast is bound to the surface of the dolomite powder by molasses. Claim 2 A method for manufacturing a composition for reducing livestock barn odor according to claim 1, characterized in that the drying is performed at 80 to 100 ℃ for 5 to 15 minutes. Claim 3 delete Claim 4 A method for manufacturing a composition for reducing livestock barn odor according to claim 1, characterized in that, after the drying step, a step of crushing the dried material and filtering it through a filter mesh with a mesh size of 20 to 30 μm to remove the powder passing through the filter mesh and collecting the powder remaining on the filter mesh is added. Claim 5 A method for manufacturing a composition for reducing livestock barn odors according to claim 1, characterized in that the dolomite powder is manufactured by a process of mixing dolomite with water, wet-grinding it, letting it stand for at least one month, and then filtering to remove the water. Claim 6 A method for manufacturing a composition for reducing livestock barn odors according to claim 1, characterized by calcining the dolomite powder at 900 to 1000 ℃ in a vacuum environment. Claim 7 delete

Images