JP2695093B2 - Deodorant composition for fecal composting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to an aqueous solution composition for deodorizing a foul odor generated during fecal composting treatment, more specifically, an alkaline earth metal salt is added to an aqueous solution containing urea and an alkali metal carbonate. , An aqueous solution composition having a pH adjusted to 6 to 8.

[0002]

2. Description of the Related Art Compost has been used as a method of fermenting stool to decompose it into low-molecular substances and using it as fertilizer. Since it deposits feces and decomposes them into low-molecular substances by the action of the enzymes and microorganisms contained therein, it produces various malodors as composting progresses, which adversely affects the environment.

In order to prevent a bad odor, for example, in feces, paraform, glyoxal, hypochlorous acid, caprohydroxamic acid, boric acid, p-nitrophenol, salicylic acid,
Substances that inhibit the growth or enzymatic action of spoilage bacteria such as propionic acid and formic acid are applied to fecal sediments.

However, although spraying of these substances suppresses the generation of offensive odors, it may delay the composting of feces or cause secondary pollution, and its use is limited because it is expensive, and it is used as an auxiliary. It is just being done.

It is also practiced to mix sawdust, chaff and the like with feces. These substances absorb bad odors and suppress the generation of bad odors, but since they need to be mixed with feces and are difficult to be decomposed by microorganisms and enzymes, they have a drawback that it takes a long time to compost feces. doing.

[0006] Therefore, while suppressing the bad odor generated in the composting of feces, without extending the period of composting,
As environmental problems become more severe, the development of safe substances that do not cause secondary pollution is being demanded.

Iron salts and their solutions have been developed as deodorants and are used for this purpose as well. However, the optimum pH of feces enzymes and microorganisms is around 8, and the iron salt solutions are acidic. , The large amount of spraying makes the pH of feces acidic, adversely affects the activities of enzymes and microorganisms in the feces, and may have an unfavorable effect on the composting of feces. And

[0008]

[Problems to be Solved by the Invention] It has a pH that does not inhibit the activity of microorganisms and enzymes present in feces, and by spraying it on stools, it prevents deodorizing odors and eliminates the risk of secondary pollution. It is an object of the present invention to provide a safe and inexpensive aqueous solution composition to be used for fecal composting.

[0009]

[Means and Actions for Solving the Problems] Although it is known that a large amount of ammonia is generated during the composting of feces, it is said that the stool-specific irritation residual odor does not correlate with the generated ammonia. It is recognized that even if the generated ammonia is absorbed efficiently, it retains a stool-specific odor. Although the composition of the residue odor not clear, fatty, A <br/> Rudehi de believed or not derived from the other lipids.

The present inventor has found that a solution obtained by adjusting the pH of an aqueous solution of an alkali metal carbonate to 6 to 8 absorbs a bad odor well, and that this solution has a bacteriostatic action against certain microorganisms. It has been acknowledged that. Therefore, this solution has a possibility of deodorizing the bad odor generated in fecal composting. Therefore, the deodorizing effect of the solution in composting feces was first examined.

As a result, it was confirmed that the residual odor peculiar to feces was deodorized in proportion to the concentration of the alkali metal carbonate, but the deodorizing effect on the generated ammonia was low and the effect lasted for a long time. That is, when the concentration of the alkali metal carbonate is lowered, the deodorizing effect of ammonia is great, but the stimulating residual odor peculiar to feces is difficult to deodorize. On the other hand, when the concentration of the alkali metal carbonate is increased, the deodorizing effect of ammonia is lowered, but the residual odor specific to feces is deodorized.

Therefore, based on this aqueous solution, a deodorant for fecal composting will be considered, and a composition for deodorizing ammonia and fecal peculiar residual odors will be studied by adding a certain reagent to the aqueous solution. It was to be.

As a result, urea and alkaline earth metal salts were added to an aqueous solution containing an alkali metal carbonate to adjust the pH to 6-8.
The desired aqueous solution composition could be obtained by adjusting the above. That is, the present invention contains urea, an alkali metal carbonate and an alkaline earth metal salt as a deodorant for fecal composting treatment, and an aqueous solution composition having a pH of 6 to 8, and
Further, the present invention provides an aqueous solution composition containing a surfactant and having a pH of 6-8.

The alkali metal carbonate used in the present invention is
Carbonates and bicarbonates of sodium and potassium, alkaline earth metal salts are inorganic and organic salts of water-soluble magnesium and calcium. The amount of the carbonate used in the aqueous solution composition of the present invention is not particularly limited, and any amount can be used as long as it can exist as an aqueous solution, but it is at least 0.5 by weight based on the composition. %, The deodorizing effect of ammonia decreases, but the deodorizing effect of fecal peculiar residual odor improves. Therefore, when mainly deodorizing ammonia, it is necessary to use a relatively low concentration, and when mainly deodorizing a specific residual odor, it is necessary to use a relatively high concentration. Use of 1-10% is sufficient.

The alkaline earth metal salt mainly acts to prevent residual odor specific to feces, although the deodorizing effect of ammonia varies depending on the type of salt used. Water-soluble inorganic and organic salts of calcium and magnesium are used. The amount used depends on the pH of the liquid composition, and generally, about 0.1 to 1.0% by weight of the composition exerts a sufficient effect. Considering solubility, magnesium salt is preferable, and magnesium acetate is particularly preferable.

Urea is known to form acids, salts, double salts and adducts with organic compounds and is added for the purpose of fixing irritating malodors, formalin and carbonic acid. When the pH of the aqueous carbonate solution is adjusted to 6 to 8, a large amount of carbonic acid is generated and a solution in which carbonic acid is dissolved can be obtained. The dissolved carbonic acid depends on the pH and temperature of the solution, and the carbon dioxide gas changes with time. As a result, the pH of the solution may fluctuate and its deodorizing power may be reduced. The presence of urea tends to suppress the fluctuation of the deodorizing power, and for example, the liquid composition of the present invention coexisting with urea has the same ammonia deodorizing power even after heating to emit carbonic acid as a gas. The amount of urea is generally 0.1 to 1.0%, and about 0.05 to 0.2% based on the weight of the carbonate used, a sufficient effect is exhibited.

In the liquid composition of the present invention, an aqueous solution containing a predetermined amount of carbonate and urea is first adjusted to near a predetermined pH, a predetermined amount of alkaline earth metal salt is added to the solution, and the pH is adjusted again. Alternatively, an alkaline earth metal salt is mixed and the pH is adjusted to obtain the desired liquid composition.

The liquid composition thus obtained may be added with a surfactant, a phenolic substance, a substance conventionally used as a deodorant, a bactericidal agent, an enzyme inhibitor and the like. In particular, the addition of a surfactant is preferable in order to improve the permeability of the liquid into feces. Although any surfactant can be used, it can be said that the addition of a bactericidal surfactant is particularly preferable. This is because the fungicide contributes to deodorization of fecal composting. For example benzal benzalkonium chloride,
As illustrated, it is effective in deodorizing feces. The amount of the surfactant added is about 0.1 to 1.0% by weight of the composition.

The present invention will be described in detail below with reference to examples.

[0020]

The present invention will be described specifically with reference to examples.
Ammonia measurement, sensory test for residual odor of pig manure, and experimental operation in Reference Examples and Examples were carried out as follows. Different lots of pig dung were used for each test.

[Ammonia measurement and residual odor sensory test] For measurement, Kitagawa type gas detector tube ammonia 25-900p
pmB type or ammonia 50-900 ppm SB type was used. The measurement is a container containing sample feces (see below)
During measurement, the container was capped with a detector tube connecting tube, and the detector tube was connected to measure the ammonia concentration in 100 ml of the contained ammonia gas. After the measurement, the ammonia reduction rate at each time was calculated from the ammonia concentration before spraying.

In the sensory test for residual odor, the nose was put on the mouth of the container, and the product was inhaled at the same speed as much as possible.
The next test was conducted after 5 minutes or more. Judgment was carried out in four stages each time an experiment was carried out by using water spray as a control. +3 ... Strong residual odor +2 ... When the peculiar odor disappears and there is considerable residual odor + ... Weak residual odor ± ... When it is difficult to determine whether there is residual odor [Experimental operation] Pig dung is leftover food The obtained food was used for 200 g each.

Put pig manure in a synthetic resin bottle with a capacity of 1 liter which can be covered with a glass tube connected to a detection tube, and leave about 40
It was placed in a constant temperature bath at ℃. When the product temperature reaches the specified temperature,
The container was capped and the concentration of ammonia gas in each container before spraying was measured. After the measurement, 10 ml of water and 10 ml of the deodorant test solution were sprayed onto each of them and placed in a thermostatic bath. After the final spraying was completed, the container was covered and the ammonia concentration at 0 hours was measured. No lid was applied during the test, and the lid was applied only when the ammonia concentration was measured.

The surfactant that can be used is Sandet EN
Is a polyoxyethylene alkyl ether sulfate sodium salt manufactured by Sanyo Chemical Industry Co., Ltd.

Reference Example 1 Tests were carried out by spraying distilled water and 10% each of 2% and 5% Na ₂ CO ₃ solutions having pH 6 on each pig feces.

The results are shown in Table 1.

[0027]

[Table 1]

Reference Example 2 Distilled water and 0.5% and 1.0% of CaCl ₂ were added to each pig manure.
The test was performed by spraying 10% each of the 10% solution.

The results are shown in Table 2.

[0030]

[Table 2]

[0031] it was carried out [Reference Example 3] Each of the swine manure distilled water and 0.5% chloride benzal benzalkonium solution was both 10ml addressed spray test.

The results are shown in Table 3 .

[0033]

[Table 3]

[Example 1] Each pig manure had distilled water and composition 1 (Na ₂ CO ₃ 0.9).
%, 0.1% _{urea, Mg (CH 3 COO) 2} · 4H 2 O
0.2%, Sandet EN 0.1%) and composition 2
(Na ₂ CO ₃ 0.9%, urea 0.1%, Mg (CH
_{3 COO) 2 · 4H 2 O} 0.5%, Sandetto EN
The test was conducted by spraying 10 ml of each solution (0.1%).

The results are shown in Table 4 .

[0036]

[Table 4]

[ Reference Example 4-i ] Distilled water and composition 1 (Na ₂ CO ₃ 0.9) were added to each pig manure.
%, Urea 0.1%, Sandet EN 0.2%), composition 2 (Na ₂ CO ₃ 1.8%, urea 0.2%, Crew iron 0.2% (as Fe), Sandet EN 0.2).
%), Composition 3 (Na ₂ CO ₃ 4.5%, urea 0.5)
%, Crew iron 0.2% (as Fe), Sandet EN 0.5%) was sprayed to each 10 ml, and the test was conducted. The results are shown in Table 5- i.

[0038]

[Table 5]

[0039]

[Table 6]

[ Reference Example 4-ii ] Distilled water and composition 1 (Na ₂ CO ₃ 0.9) were added to each pig manure.
%, Urea 0.1%, Crew iron 0.2% (as Fe), Sandet EN 0.1%), Composition 2 (Na ₂ C)
O ₃ 0.9%, urea 0.1%, crew iron 0.5%
The test was performed by spraying each solution (as Fe) and Sandet EN 0.1%) in an amount of 10 ml.

The results are shown in Table 5- ii.

[0042]

[Table 7]

Reference Example 5 Distilled water and deodorant test solution (Na ₂ CO ₃ 0.
9%, 0.1% _{urea, Mg (CH 3 COO) 2} · 4H 2
O 0.5%, Crew iron 0.2% (as Fe),
Both solutions of Sandet EN 0.1%) were sprayed to both 10 ml and tested.

The results are shown in Table 6 .

[0045]

[Table 8]

[ Reference Example 6 ] Distilled water was added to each pig manure, composition 1 {Mg (CH ₃ COO) ₂
4H ₂ O 0.5%, crew iron 0.2% (as Fe), Sandet EN 0.1%}, composition 2 {Mg
_{(CH 3 COO) 2 · 4H} 2 O 1.0%, 0.2% Kurewatto iron (as Fe), Sandetto EN 0.1
%, Composition 3 {Mg (CH ₃ COO) ₂ .4H ₂ O
The test was conducted by spraying each solution of 1.0%, crew iron 0.5% (as Fe), and Sandet EN 0.1%} to 10 ml each.

The results are shown in Table 7 .

[0048]

[Table 9]

[0049]

[Table 10]

[0050]

EFFECT OF THE INVENTION The liquid composition according to the present invention is obtained by a simple operation, is harmless, does not cause a secondary pollution, and is effective in deodorizing fecal composting in a small amount. In addition, as a deodorizing liquid,
It can be used as a deodorant for various malodors.

Continuation of front page (56) Reference JP-A-52-51755 (JP, A) JP-A-62-32960 (JP, A) JP-A-63-132661 (JP, A) JP-A-63-117764 (JP , A) JP 46-6049 (JP, A) JP 57-42590 (JP, A) JP 55-129064 (JP, A) JP 63-23715 (JP, A) JP 54-23095 (JP, A)

Claims (5)

(57) [Claims] 1. A deodorant composition for fecal composting, which comprises an aqueous solution containing an alkali metal carbonate, urea and an alkaline earth metal salt and having a pH of 6-8. 2. Alkali metal carbonate 1 to 10 by weight.
%, Urea 0.1-1.0% and alkaline earth metal salt 0.
The liquid composition according to claim 1, which is 1 to 1.0%. 3. The liquid composition according to claim 2, wherein the alkaline earth metal salt is magnesium acetate. Wherein any one of a liquid composition of claims 1 to 3 containing a surfactant. 5. The surfactant is 0.1 to 1.0% by weight.
The liquid composition according to claim 2, which is