JP5294166B2 - Deodorizing method of odor generated from livestock manure - Google Patents

Description

The present invention relates to a deodorizing method for reducing or removing odor generated when manure of livestock such as cows, pigs and chickens is processed, or dried and fermented to become organic fertilizer.

The livestock industry for livestock such as cattle and pigs and the poultry house for obtaining eggs are becoming larger, and the odor generated from the livestock house and livestock manure has become a major problem. In addition, compost plants for regenerating manure from these livestock as organic fertilizers are problematic because of the generation of odors containing high concentrations of ammonia during the process of fermentation and drying of manure. These odors hinder the operation of livestock barns and compost factories, and if they flow to the vicinity, they become odor pollution and become complaints of local residents. For this reason, it is essential to detoxify these odors by deodorizing or deodorizing them.

Various deodorizers and deodorizers have been proposed for this purpose. As methods for applying these agents, there are a method of deodorizing by directly spraying deodorant on livestock manure and a method of separating odor generated from livestock manure with a blower or the like and reacting with the deodorant. Examples of chemical deodorants that are directly treated on livestock manure include (PTL 1) a deodorant using lignin sulfonic acid or a salt thereof, and (PTL 2) ferrous sulfate with citric acid or A deodorant composition to which malic acid has been added has been proposed. However, when spraying directly on livestock manure, it is necessary to spray all of the manure and the amount of deodorant used is enormous. In addition, in plants where fertilizer is prepared by drying and fermenting livestock manure Has the disadvantage that deodorant components are mixed in fertilizer. In addition, when the deodorant is an aqueous liquid, water is given to manure to be dried, which has the drawback of obstructing the fertilizer process.

As an example of separating odor gas from livestock manure and deodorizing (Patent Document 3), a method of contacting odor with an acidic aqueous solution such as hydrochloric acid or sulfuric acid and then contacting phosphoric acid or the like with a peroxide is used. ing. However, these deodorizers produced a reaction product of odor and deodorant after deodorization, and it was necessary to treat this as waste. As the size of the barn grows, the amount of waste generated becomes enormous, and the labor and cost required to dispose of it increases as well. Further, a method using microorganisms has been proposed as a deodorizing method in which the generation of waste is relatively small. (Patent Document 4) describes a deodorizer using bacteria belonging to the species of Bacillus megaterium (Patent Document 5). ) Has proposed a deodorizing method using Bacillus microorganisms. However, since the deodorization rate using microorganisms is slow, there are disadvantages that a large space is required for equipment for deodorization and it is difficult to maintain the conditions for culturing microorganisms.

Many proposals have also been made on various devices for deodorizing odorous gas generated from livestock manure, and in (Patent Document 6), a high concentration ammonia odor generated from livestock manure is supplied to a deodorizing tower for batch-type activity. There is a method of treating activated sludge supplied from a sludge wastewater treatment facility and treating the activated sludge after use at a batch activated sludge wastewater treatment facility. The reaction between activated sludge and high-concentration ammonia odor However, the deodorization efficiency is not high. In addition, there is a disadvantage in that surplus sludge is produced by treating the reaction solution by the activated sludge method, and it is expensive to dispose of this. (Patent Document 7) proposes a device that prevents the odor generated from chicken dung from passing through the dried and fermented chicken dung, thereby preventing the odor from spreading. However, the ammonia was not completely removed by just passing through the process, and the deodorizing effect was not practical. (Patent Document 8) proposes a method of removing odor generated from a barn by spraying water and oxidizing and reducing an ammonia component in treated water by biological treatment. However, there is a problem that the odor treatment efficiency is low because the removal of ammonia by water spray is not complete. (Patent Document 9) proposes a deodorizing apparatus using a wood wool cement board. However, it is difficult to obtain a sufficient deodorizing effect because the deodorizing effect is not persistent. Moreover, since it is necessary to replace | exchange a large amount of wood wool cement board regularly, there existed a problem that cost increased. (Patent Document 10) proposes a method of deodorizing livestock manure using a reaction agent such as calcium oxide in the first to fifth steps, but the process is complicated and the odor of ammonia or the like due to the exothermic heat of calcium oxide. It was difficult to fundamentally solve the odor because of volatilization. (Patent Document 11) proposes a method for deodorizing a liquid obtained by treating livestock urine by an activated sludge method by spraying it on the compost during fermentation. There is a drawback that the activated sludge apparatus and the concentrating apparatus for treating livestock urine are expensive because the odor containing ammonia at a high concentration is not sufficient.

JP 2004-337533 A JP-A-6-165815 Japanese Patent Laid-Open No. 5-15732 JP-A-5-153971 JP 2003-146820 A JP 2001-259008 A JP-A-9-241088 JP 2000-325728 A JP 2000-107557 A Japanese Patent Application Laid-Open No. 9-142977 JP 2002-160985 A

Deodorize ammonia-containing odors from cattle, pigs, chickens and other livestock and manure generated from these livestock, and treat the reaction solution after deodorization without cost. This is the subject of the present invention.

  As a result of intensive studies, the present inventors have deodorized odors containing ammonia generated from livestock barns and livestock using a deodorant containing phosphoric acid and / or various organic acids, and further deodorized liquid. It was found that mixing odors with manure makes it possible to efficiently remove odors without generating waste, thereby completing the present invention.

That is, the present invention is to contact a deodorant containing at least one acid selected from phosphoric acid, malic acid, citric acid, tartaric acid, and lactic acid with odor generated from livestock manure of cow dung, pig dung, and chicken dung. It is a deodorizing method for livestock manure, etc., characterized in that it is treated by mixing the reaction solution after deodorization into feces and urine.

The present invention also provides a deodorant containing (Component A) phosphoric acid and (Component B) at least one acid selected from malic acid, citric acid, tartaric acid, and lactic acid. A deodorizing method for livestock manure or the like, characterized by deodorizing by contacting with odor generated from manure and mixing the deodorized reaction liquid into manure.

Further, the present invention generates a deodorant containing at least one acid selected from (Component A) phosphoric acid and (Component B) citric acid and malic acid from cow dung, pig dung and chicken dung livestock dung. It is a deodorizing method for livestock manure, etc., characterized in that it is deodorized by contact with odor and treated by mixing the deodorized reaction liquid into manure.

By applying the deodorization method using the deodorant of the present invention, it becomes possible to effectively remove ammonia-containing odors generated from livestock barns or livestock, and the reaction solution after deodorization can be removed from livestock. By mixing it with manure, it can be deodorized without generating waste.

Although it is effective to use an acid for deodorizing odors containing ammonia, strong acids such as sulfuric acid and hydrochloric acid are inexpensive but difficult to handle and have a high risk. Low acid organic acids such as malic acid, citric acid, tartaric acid, lactic acid, fumaric acid, succinic acid, maleic acid, malonic acid, oxalic acid, glutaric acid, adipic acid can be mixed into the original livestock manure after deodorization Among them, suitable are acids that are water-soluble and have no odor, and are naturally present and recognized as food additives. Examples thereof include malic acid, citric acid, tartaric acid, and lactic acid. Moreover, phosphoric acid can also be mentioned as a deodorant as an inorganic acid recognized by the food additive.

As phosphoric acid used as a deodorant, orthophosphoric acid, pyrophosphoric acid, metaphosphoric acid, phosphorous acid, hypophosphorous acid and the like can be considered, but in view of safety, orthophosphoric acid is desirable. For orthophosphoric acid, an industrially produced 85% phosphoric acid solution can be used. The concentration of phosphoric acid, malic acid, citric acid, tartaric acid, fumaric acid and succinic acid in the deodorant is not particularly limited, but it is blended in the range of 1 to 60%, more preferably 5 to 50%. . If the concentration is higher than this range, preparation is difficult, and acid may be precipitated depending on temperature conditions. Further, at a concentration lower than this concentration range, the deodorizing effect cannot be sufficiently obtained.

When formulating, it is most suitable to use water as a solvent, but other polar solvents can also be mixed and used. For example, polar solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol, acetone, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, glycerin, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, and diethylene glycol monobutyl ether can be appropriately used. Deodorant containing phosphoric acid, malic acid, citric acid, tartaric acid, lactic acid, if necessary, other deodorant components such as metal salts such as iron, copper, cobalt, zinc, bromonitroethanol, bromonitro Organic substances such as ethanol diacetate, fragrances, colorants, etc. may be mixed.

The method for bringing the deodorant into contact with an odor containing high-concentration ammonia is not particularly limited, but the method using a shower contact in the reaction tower, the method for blowing off the odor in the bathtub containing the deodorant, and the deodorant are supported. A method of passing through a column that is held or immobilized is possible.

As a deodorizing method that does not generate waste, a method of spraying or spraying a deodorant directly on manure can be considered, but in this method, it is necessary to spray a deodorant on all manure and drying for composting If the water is spread to the floor in the factory, it may become slippery and difficult to operate. When the reaction solution after deodorization is mixed with feces, it can be mixed with a portion of feces whose humidity is to be adjusted, and drying for composting is not hindered.

Next, although the Example and test example of this invention are given and demonstrated, this invention is not limited to these. Examples 1 to 10 were prepared with the formulations shown in Tables 1 and 2, and Comparative Examples 1 to 5 were prepared in Table 3 by a method using ordinary stirring.

(Test Example 1)
Add 20 g of chicken manure into the container, add 0.5 ml each of Deodorant Examples 1 to 10 or Deodorant Comparative Examples 1 to 5, and detect the ammonia concentration over time with a detector tube (manufactured by GASTEC, detector for ammonia) Measurements were made using tubes 3M, 3La). The results are shown in FIGS. In the examples, the ammonia concentration decreased rapidly and showed a sufficient deodorizing effect.

(Test Example 2) Germination test Examples 1 to 3 and 6 to 8 were each reacted with ammonia to prepare neutralized solutions. After 2 g (2%) or 5 g (5%) of the liquid was added to 100 g of fertilizer obtained by drying and fermenting chicken manure, it was diluted 20 times with distilled water. The liquid which was allowed to stand for 30 minutes and sufficiently stirred was filtered through No. 5A filter paper. Two pieces of No. 2 filter paper were put in a petri dish, and 10 ml of the filtrate was added thereto. Furthermore, 100 seeds of silkworm radish or Komatsuna were sprayed and cultured at 25 ° C. The germination state was observed after 2 days and 4 days, and the germination rate was calculated. The results are shown in Table 4. No effect on the germination rate of the reaction solution of Example and ammonia was observed.

It is possible to efficiently remove the odor containing ammonia at a high concentration generated from livestock manure without producing waste by the deodorization method of the present invention.

Deodorizing effect of Examples 1-3 Deodorizing effect of Examples 4-6 Deodorizing effect of Examples 7-10 Deodorizing effect of Comparative Examples 1-5

Claims (3)

Deodorizer containing phosphoric acid in the range of 5 to 50% by weight is deodorized by contacting with ammonia generated from livestock manure of either cow dung, pig dung or chicken dung, and the reaction solution after deodorization is obtained. A method for deodorizing livestock manure, characterized by being processed by mixing with manure. Deodorant containing (Component A) phosphoric acid and (Component B) at least one acid selected from malic acid, citric acid, tartaric acid and lactic acid in a total range of 5 to 50% by weight , The deodorization of livestock manure according to claim 1, wherein the deodorization is performed by contacting with the ammonia generated from livestock manure of swine manure and chicken manure, and the reaction solution after deodorization is mixed with the manure. Method. Deodorant containing (Component A) phosphoric acid and (Component B) at least one acid selected from malic acid and citric acid in a total range of 5 to 50% . 3. The livestock manure according to claim 1, wherein the livestock manure is deodorized by contacting with ammonia generated from any livestock manure, and the reaction solution after the deodorization is mixed with the manure and treated. Deodorization method.

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