JPH0687887B2 - How to remove spoilage - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an organic substance containing a nitrogen atom or a sulfur atom, such as livestock meat, seafood, grains and processed products thereof, which are composed of proteins, amino acids, nucleic acids and the like, or their ingestion into the living body. The present invention relates to a method for removing a bad odor caused by the decomposition products, excrements, etc. after being metabolized and metabolized, and is useful in food processing plants, refuse processing plants, toilets, and night soil processing plants.

[0002] In facilities using seawater such as thermal power plants and nuclear power plants, a work of regularly removing the attached shellfish is performed, and a large amount of the shellfish removed at that time is decomposed to give off a bad odor. However, the method of the present invention is also useful for removing such malodors.

[0003]

2. Description of the Related Art Glyoxal or a metal salt and a combination thereof have been proposed as a method for removing a malodor generated by an organic substance containing a nitrogen atom or a sulfur atom such as hydrogen sulfide, ammonia, methyl mercaptan and amines. ing. (For example, JP-A Nos. 54-154528 and 62-
(No. 84767 publication)

However, these methods are not methods for suppressing the generation of malodor itself, but for removing only the malodor generated, and therefore, when the amount of malodorous substance is large, a large amount of chemicals is required, which is economical. It wasn't.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for efficiently removing a bad odor caused by the decomposition of an organic substance containing a nitrogen atom or a sulfur atom.

[0006]

Means for Solving the Problems As a result of various tests in view of such circumstances, the present inventors have found that chlorinated isocyanurine is added to an organic substance containing a nitrogen atom or a sulfur atom which decomposes and produces a malodor. By contacting an anti-corrosion agent containing an acid compound as an active ingredient, and then contacting at least one deodorizing agent selected from the group of glyoxal, iron sulfate and iron chloride, it is possible to achieve the intended purpose. They found out and came to complete the present invention.

Typical antiseptic agents used in the present invention are trichloroisocyanuric acid, dichloroisocyanuric acid, sodium dichloroisocyanurate, potassium dichloroisocyanurate and the like.

Further, typical deodorizing agents used in the present invention include glyoxal, ferrous sulfate, which has an excellent deodorizing effect against perishable malodors such as hydrogen sulfide, ammonia, mercaptans and amines. It is selected from iron salts of ferric sulfate, ferrous chloride and ferric chloride, and when glyoxal is used, the pH is adjusted to a neutral range using a buffering agent such as dibasic sodium phosphate. It is preferable to adjust to.

The method of treating the anti-corrosion agent used in the present invention varies depending on the state of the malodor generating source made of an organic substance containing a nitrogen atom or a sulfur atom. That is, when the malodor source is in the liquid phase, the antiseptic agent can be directly contacted as it is, in either powder or solution form, but when the malodor source is in the gas phase part, It is more effective to dissolve the powdered anti-corrosion agent in water and bring them into contact with each other.

In the treatment method of the present invention, the anti-corrosion agent is contacted with the anti-corrosion agent at the same time as the anti-corrosion agent is contacted with the object, rather than simultaneously with the deodorant agent. Deodorant can be performed.

Of the deodorizing agents used in the practice of the present invention, iron salts are effective at sites where hydrogen sulfide and ammonia are mainly generated, and specifically, they are effective for deodorizing night urine. In addition, glyoxal is effective in a site where hydrogen sulfide, ammonia, mercaptans, and amines are mainly generated, and is suitable for deodorizing fish and shellfish for rotten odors and garbage.

The deodorizing agents used in the present invention are not limited to the use alone.
Depending on the case, a deodorant can be used in combination, and in that case, it is preferable to first contact the iron salt and then the glyoxal.

[0013]

According to the method for removing spoilage malodor of the present invention, a chlorinated isocyanuric acid compound having a bactericidal effect as an antiseptic agent is used to remove bacteria attached to an organic compound containing a nitrogen atom or a sulfur atom. It is possible to suppress the progress of decay of the malodorous source, reduce the malodorous substance generated, and remove the malodorous substance by using a small amount of deodorant.

[0014]

Example 1 Two glass bottles having a volume of 5 liters were prepared,
To one of the glass bottles, 361 g of fresh clams (118 g of meat, 243 g of shells), 2 liters of seawater and 400 mg of powdery sodium dichloroisocyanurate (SDIC) were added, and to the other glass bottle, the same amounts of clams and seawater were added. Leave these bottles at a temperature of 30 ° C and adjust the pH every 24 hours.
At the same time as the measurement, the 300 ml sample water was sampled each time to measure the hydrogen sulfide concentration and the ammonia concentration.

After sampling, after confirming that residual chlorine was not detected in the bottle to which seawater corresponding to the amount of water to be sampled was newly added and sodium dichloroisocyanurate was added, dichloroisocyanuric acid was added each time. 400 mg of sodium was added.

The concentration of hydrogen sulfide in the sampled septic liquid was measured by the iodometric titration method, and the concentration of ammonia was measured by the indophenol coloration method. The test results are shown in Table 1.

[0017]

[Table 1]

Also, using the above-mentioned sample water sampled every 24 hours, the respective concentrations of hydrogen sulfide, ammonia, methyl mercaptan, and amines generated when stirring with a stirrer for 3 minutes were carried out using a Kitagawa-type detector tube. Measured. The test results are shown in Table 2.

[0019]

[Table 2]

100-day-old shellfish spoilage liquid with the highest degree of decay 100
Using ml, the amount of deodorant required until the concentration of each malodorous gas cannot be measured with a detector tube was observed.When sodium dichloroisocyanurate was added as an antiseptic agent, ferrous sulfate and glyoxal were added. Each
0.7 g was needed. On the other hand, when no antiseptic agent is added, ferrous sulfate 13.7 g and glyoxal 6.9
g was required.

[0021]

[Example 2] In a cooling water receiving pit of a certain power plant where large-scale shell removal and cleaning operations are being carried out, a deodorant test for putrefactive malodor was conducted on the third day after stopping the cooling water receiving. . On the first day, 15 kg of sodium dichloroisocyanurate was placed in a pit containing an estimated total weight of 20 t shellfish and 30 m ^{3 of} seawater.
To prevent corruption. The next day, after pumping up the seawater in the pit, 100 liters of water in which 15 kg of sodium dichloroisocyanurate was previously dissolved was sprayed on the shellfish deposited at the bottom of the pit.

Before the shell removal and cleaning work on the third day,
1 liter of shellfish spoilage liquid in the pit was sampled, and the concentration of each malodor generated when the above test water was stirred with a stirrer was measured using a Kitagawa type detector tube.
m 2, ammonia concentration was 20 ppm, methyl mercaptan concentration was 58 ppm, and amines concentration was 12 ppm. Next, after deodorizing work using 280 kg of ferrous sulfate and 35 kg of 20% glyoxal, each malodor concentration was measured in the same manner as above, but it could not be measured with the detector tube, and the malodor in the pit was removed. .

[0023]

[Example 3] Fresh human urine and stool were mixed in a weight ratio of 19: 1, and sewage diluted two-fold with water was put in two glass bottles each having a volume of 1 liter, 150 ml each, and one bottle contained in one bottle. 0.15 parts by weight of trichloroisocyanuric acid (TICA) was added and not added to the other bottle. Temperature these bottles to 25
The sample was left to stand at a constant temperature of ℃, and the pH and hydrogen sulfide and ammonia concentrations were measured every 24 hours by the Kitagawa method. The test results are shown in Table 3.

[0024]

[Table 3]

[0025]

Example 4 A septic malodor removal test was conducted in two simple toilets in which sewage having an estimated urine / stool ratio of 19: 1 is excreted at a rate of about 5 liters per day. To one simple toilet wastewater, 5 g of potassium dichloroisocyanurate (PDIC) was added, and after confirming that there was no residual chlorine every 24 hours, 5 g of potassium dichloroisocyanurate was newly added each time, and to the other Was not added at all. After 24 hours from the start of the test, 100 ml of each of the toilet sewage was sampled, and each malodor concentration was measured by the Kitagawa detection tube method. The test results are shown in Table 4.

[0026]

[Table 4]

Further, when a deodorizing test was conducted on 100 ml of both toilet wastewater collected 72 hours after the start of the test, the amount of ferrous sulfate required until the malodor was not detected was
It was 0.9 g when PDIC was used and 6.5 g when PDIC was not used.

[0028]

EFFECTS OF THE INVENTION According to the method of the present invention, the anti-corrosion agent suppresses the decomposition of the malodorous source by microorganisms to remarkably reduce the generation of malodorous substances, and at the same time maintains the pH of the spoilage liquid near neutral. As a result, excessive generation of the sulfur-based acidic gas or the nitrogen-based alkaline gas is suppressed, so that the amount of the deodorant used can be greatly reduced to completely remove the malodor.

Claims (1)

[Claims] To claim 1 the organic substance containing a nitrogen atom or a sulfur atom spoilage to occur malodor, is contacted corruption inhibitor as an active ingredient a chlorinated isocyanuric acid compound, following Ide Griot <br/> Kizaru, sulfate A method for removing a putrefactive malodor, which comprises contacting at least one deodorizing agent selected from the group consisting of iron and iron chloride.