JPH08117791A - Deodorization by organism - Google Patents

Abstract

PURPOSE: To provide the method of deodorizatio by organism excellent in deodorizing ability, and capable of eradicating malodor at its source and deodorizing malodor in drain in drained water by organism. CONSTITUTION: Photosynthesis bacteria are transplanted and proliferated in a gel carrier containing a culture medium and water which consists of a water- soluble silicic compound and vinyl alcohol as main components. This proliferated and immobilized bacteria adjusted to a final pH value of 8.1 to 8.4 is arranged in the drain of an aeration tank 7 and a settlement tank 8. Thus the bad-smell component of the drain is deodorized by bacteria which proliferate in the proliferated in the stabilization material.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a biological deodorant for deodorizing a malodorous component contained in drainage liquid microbiologically and for preventing the generation of a malodorous component in wastewater from a microbiological source. Regarding the method.

[0002]

2. Description of the Related Art Conventionally, as a method for deodorizing malodorous substances such as hydrogen sulfide, ammonia, aliphatic mercaptans, methyl sulfide, and methyl disulfide, a malodorous gas is passed through a packed tower loaded with a pair of microorganisms. So-called biological deodorizing method and biological deodorizing device for deodorizing have been proposed.

[0003]

However, in the conventional biological deodorizing method and biological deodorizing apparatus, microorganisms are pre-incubated and then attached to a carrier, and the carrier with the attached microorganisms is loaded into a packed tower, Since the odorous gas is passed through to deodorize, the deodorizing ability is mainly governed by the amount of adhered to the carrier and the amount of survival of microorganisms after adherence. There is a limit to the amount, and the viable amount of microorganisms is reduced depending on the environment, so the biological deodorizing ability was not always sufficient.

Further, the conventional biological deodorizing method and biological deodorizing apparatus are mainly intended to deodorize the bad odor after it is generated, and there is no idea to prevent the source of the bad odor from the root. The current situation is that it is not secured.

On the other hand, recently, based on the revision of the regulation standard of the Odor Control Law, the odor emitted from factory effluent is not regulated by mere odor concentration as in the past, but in the effluent causing the odor. However, the conventional biological deodorizing method and biological deodorizing device are methods and devices for removing the odor, that is, the gas level after they are generated. However, it is difficult to deal with it effectively.

The object of the present invention is excellent in biological deodorizing ability,
Another object is to provide a biological deodorization method capable of eradicating a bad odor from its source and capable of biologically deodorizing a malodorous component in waste water.

[0007]

Means for Solving the Problems As a result of extensive studies to achieve the above object, the present invention has found that a gel carrier containing a water-soluble silicic acid compound and polyvinyl alcohol as main components and containing a medium and water is used. , A biological deodorization method was employed in which a microorganism-immobilized and immobilized microorganism-immobilized substance is placed in a drainage liquid containing a malodorous component, and the malodorous component is deodorized by the microorganism that proliferates in the immobilized substance. Further, a gel carrier containing a water-soluble silicic acid compound and polyvinyl alcohol as a main component and containing a medium and water, a microorganism immobilization product in which microorganisms are transplanted is added to a waste liquid in which a malodorous component is generated. A biological deodorizing method was adopted in which the microorganisms that are arranged and prevent the generation of malodorous components at the generation source by the microorganisms growing in the immobilization product.

[0008] That is, in the conventional biological deodorization, since the microorganisms were simply attached to the carrier, the limit of the amount of attachment to the carrier and the reduction of the viable amount of the microorganisms due to environmental factors occurred. In view of this, the medium is mixed in the gel carrier to create an environment in which the microorganisms can be positively proliferated in the gel carrier, thereby overcoming the limit of the amount attached to the carrier, and also the survival amount of the microorganisms due to environmental factors. This is a structure that can prevent the decrease.

The microorganism used in the present invention is not particularly limited as long as it can be optimally used in this method of use. Usually, photosynthetic bacteria are used, and microorganisms belonging to one or more of the genera Rhodobacter, Rhodopseudomonas, Rhodosubilium, and Chromatium can be used.
Although the red sulfur bacterium and the red non-sulfur bacterium can be used alone, it is preferable to use the red sulfur bacterium and the red non-sulfur bacterium as symbiotic bacteria in order to properly adapt to the environment. Further, microorganisms composed of a plurality of genera adsorbed on sludge and / or humus can also be used as long as they are symbiotic with photosynthetic bacteria.

The biological deodorizing apparatus using this biological deodorizing method is not particularly limited, and any apparatus that achieves the same method can be used.

For example, it suffices to provide a biological deodorizing tank in which the microorganism fixed and immobilized product is charged, and to supply the biological deodorizing tank with factory wastewater containing a malodorous component.
It is also possible to incorporate it into an existing treatment system for factory wastewater for treatment. For example, oxygen aeration tank,
It can also be installed in a settling tank or even in a transfer pipe for factory wastewater.

By the way, the growth-immobilized substance of the microorganisms used by being added to the odorous drainage liquid settles on the bottom of the water such as an aeration tank or a sedimentation tank to release the microorganisms into the drainage environment to release the microorganisms to the drainage environment. It must be capable of forming an environmental microflora to transform a poor environmental condition into the original environment and restore the biota to a normal ecosystem. In addition, when it is put into a drainage environment, the composition of the microbial growth and immobilization product must be chemically stable, and the molded growth and immobilization product must have physical strength and be usable for a long period of time. Furthermore, it is necessary that the microorganisms immobilized in the same growth-immobilized product do not leak or the leakage is minimized.

In addition, the microbial flora in the environment is changed,
When using microorganisms to change the ecosystem,
Unless a large amount of microorganisms are continuously supplied locally, the microorganisms adapted to the existing environment cannot survive or proliferate in the existing environment. On the other hand, if the gel carrier for immobilizing microorganisms is stable in the environment, it remains in the environment and destroys the environment. It is important that the decomposition products are not toxic and that they do not change the environment because they are decomposed by microorganisms.

[0014] Furthermore, when the microorganism-immobilized product is used by throwing it in, it is easy to handle and has a stable shape, such as collapse, crack, flow, and odor.
It must be free of transportation and transportation concerns. In addition, it is necessary that it does not physically change at room temperature and room temperature, that it can be cultured after being filled in a container, that it has excellent releasability from the container, and that it does not float in water.

Therefore, the microorganism immobilization product used in the present invention comprises a water-soluble silicic acid compound, PVA, water, a medium, and a microorganism culture solution or a microorganism, and when all the components are mixed, gelation begins, and this gel Among them, the growth immobilization product of the microorganism in which the microorganism grows is adopted.

It should be noted that the water-soluble silicic acid compound does not give a more elastic gel as the pH becomes lower, and it hardens because it solidifies, giving it elasticity, solubility and degradability in water, and further gel. PVA is also mixed as one component constituting the gel carrier because it is necessary to have the ability of the microorganisms to grow therein.

However, ensuring the survival of the microorganisms in the gel,
To further improve the culture growth, the hydrogen ion concentration (p
Adjustment of H) is essential. Although there are some variations depending on the type of microorganism, usually, when the pH is lowered to less than 6.5, good growth of the microorganism is not ensured. This is because microorganisms, especially photosynthetic bacteria themselves become difficult to survive in this acidic region, and the water-soluble silicic acid compound does not harden uniformly with elasticity in a state of being mixed with other components, and it hardens nonuniformly. is there. On the other hand, when the pH is brought to a range over 8.5 and mixed, the water-soluble silicic acid compound does not function as a gelling agent.

As a result of further examination of the pH range in which the microorganisms immobilized in the gel carrier survive and proliferate, if the final pH is 6.5 to 8.5, 1 g of the gel carrier is in culture.
Among them, it was found that microorganisms survive on the order of 10 ⁶ or more. As a result of further examination, the final pH was 8.
It has been found that the one adjusted to 1 to 8.4 is optimum. In this region, the viable cell count will be on the order of 10 ⁸ to 10 ⁹ .

Therefore, in the case of producing a growth immobilization product of this microorganism, a water-soluble silicic acid compound, PVA, a medium, water and a culture solution of the microorganism are mixed to adjust the final pH to 6.5 to 8.5. Need to be gelled. The pH can be adjusted by using an acid such as hydrochloric acid after mixing the components, but the water-soluble silicic acid compound is treated with an alkaline component solution while taking the pH of the culture solution of the microorganism into consideration. Prepare,
The most preferable method is to prepare a PVA solution in advance as an acid component solution and secure a pH in an optimum range during mixing. This is because of the need for flexible gelling and creating a stable microbial survival environment. That is,
Subsequent adjustment with an acid such as hydrochloric acid causes a relatively rapid change in pH, which is not preferable as a better environment for survival of microorganisms, and the adjustment of gel elasticity, flexibility, hardness, etc. Because it becomes difficult.

As described above, PVA imparts elasticity and the like to the water-soluble silicic acid compound which imparts hardness, and also has solubility and degradability in water, and further, proliferation of microorganisms in the gel. Although it is a constituent of the gel carrier because it is necessary to provide the polymer, the degree thereof is mainly controlled by the acetate residue of PVA and the degree of polymerization, and the mixing ratio of PVA and the water-soluble silicic acid compound. The acetate residue of PVA is 30 to 40%, the degree of polymerization is 500 to 2000, and the mixing ratio of PVA and the water-soluble silicic acid compound is 1.5 to 1 in the most preferable range.

Examples of the water-soluble silicic acid compound include potassium silicate and sodium silicate as the inorganic silicic acid compound, and methyl silicate, ethyl silicate, propyl silicate as the organic silicic acid compound. Examples thereof include butyl silicate and the like.

[0022]

The present invention uses a water-soluble silicic acid compound and PVA as main components, and a growth and immobilization product of a microorganism in which a microorganism is transplanted in a gel carrier containing a medium and water. It is a method of deodorizing malodorous components by microorganisms that grow in the immobilizate in the wastewater, for example, in the sludge at the bottom of the wastewater tank, in the vicinity of the sludge surface, near the water bottom. Unlike the biological deodorizing method described in (1), since the microorganism grows in the immobilization product, the survival amount of the microorganism is increased and the biological deodorizing ability is significantly improved.
In addition, this is a method of preventing a source of a bad smell from the root, and is not a method of deodorizing after dissolving and spreading a bad smell substance in wastewater as in the conventional method, so that fundamental deodorization is secured. Also, because it is a method that can decompose the malodorous component in the wastewater at the previous stage, not the level of the malodorous gas, it can be regulated by the concentration of the malodorous component in the wastewater, which is effective against the regulations of the Malodor Prevention Law. Can be dealt with.

Further, in particular, the survival of the microorganisms is ensured in the gel carrier to ensure good growth, and the microorganisms can be released into the aquatic environment in a controlled manner, and even if installed in a predetermined environment, it is good. Since the proliferation is repeated, it is possible to continuously supply a large amount of microorganisms locally at the installation location.

Further, the microorganism immobilization product used in the present invention has a chemically stable composition and physical strength, and can be used for a long period of time. Moreover, since the water-soluble silicate and PVA are used as the main components of the gel carrier, they do not remain in the environment and destroy the environment, they have decomposition characteristics, and the decomposition products are not toxic. It can be released to the outside world such as the sea.

Further, the shape is stable, it does not crumble, crack, fluidize, or has an odor, is easy to carry and move, and is extremely easy to handle. Further, if it is filled in a container, it is cultured there. In addition, the elasticity of PVA provides excellent peelability from the container. Further, since it does not float in water, it can be easily settled on the bottom of the water and installed.

Therefore, a method of deodorizing a malodorous component by arranging the microorganism immobilization product of the present invention in the biological deodorization tank through which the wastewater passes, and by the microorganisms growing in the immobilization product in the wastewater, can be provided. Of course, it is possible to deodorize offensive odor components by microorganisms growing in the immobilization product in the passing drainage liquid by appropriately arranging it wherever the drainage liquid passes, without providing a special biological deodorizing tank. You can also

[0027]

EXAMPLE FIG. 1 is a process drawing of wastewater treatment in one factory for explaining one example of the biological deodorizing method according to the present invention.

As shown in FIG. 1, out of the process wastewater of the factory, the machine wastewater (M / C wastewater) is the target of the inactive sludge and the sludge treatment is NO. 2 Clary 1, NO. After being treated with 5 clary 2, it is discharged into the sea from the comprehensive drainage port 3 as integrated drainage. On the other hand, among the process wastewater of the factory wastewater, the raw wastewater is the target of activated sludge and the sludge treatment is NO. 3 claries 4 and N 0.4 claries 5 and then cooling tower 6
Through the aeration tank 7, then transferred from the aeration tank 7 to the settling tank 8 and discharged from the comprehensive drainage port 3 to the sea as integrated drainage.

On the other hand, the odorous wastewater 9 containing the odorous component is directly transferred to the aeration tank 7 as shown in the figure, and is settled in the precipitation tank 8
It is discharged to the sea from the comprehensive drainage port 3 as comprehensive drainage through the. In this series of wastewater treatment processes, the raw wastewater contains a large amount of sulfides, and the odorous wastewater 9 contains the most sulfides. Conventionally, the odor drainage 9 is air stripped, but this is not always sufficient.

When the present invention is carried out, for example, a microorganism-immobilized and immobilized product is installed in the drainage liquid in the aeration tank 7 and the drainage liquid in the precipitation tank 8, and the malodorous components of the odorous wastewater are stored in the microorganisms at these two locations. To disassemble.

The growth immobilization product used here was produced as follows. pH adjusted to 1.3, 10% PVA with about 30% acetate residue and about 1000 degree of polymerization
2 liter of aqueous solution and 20% adjusted to pH 11.9
0.53 liter of an aqueous potassium silicate solution, 4.14 liter of the following medium and water, and 0.7 liter of a culture solution of Rhodopseudomonas capsulata having a pH of 8.5 were mixed and stirred at the same time to obtain a final pH of 8.3. Depth of gel solution 5
cm, 10 cm diameter transparent plastic container.

The medium used was 5 g of sodium propionate, 1 g of ammonium chloride, 0.8 g of potassium phosphate, 0.2 g of magnesium chloride, 0.1 g of sodium chloride, 0.05 g of calcium chloride, 0.5 g of sodium hydrogen carbonate and yeast extract. 0.2 g, 1000 ml of water, pH 7.5.

Shortly thereafter, the ungelled solution gelled,
A gel-like growth and immobilization product of the microorganism was obtained. After culturing under illumination for 5 days, a growth-immobilized product of a microorganism that grew bright red in the medium in the gel was obtained. When the viable cell count was measured, it was on the order of 10 ⁸ .

Incidentally, if an attempt is made to produce a growth-immobilized product of the above-mentioned microorganism whose pH is adjusted to 6.5 or less, it is impossible to mix the components because the gelation rate is high. Further, if the mixing is continued, the gel collapses and fluidizes. Further, when a growth-immobilized product of the above-described microorganisms having a pH adjusted to 8.6 was produced, the gel strength was weak, and the product became gunky and easily collapsed when taken out from the container.

On the other hand, the final pH is 6.5, 7.0, 7.
If the above-mentioned microorganism growth and immobilization product adjusted to 8, 7.9, 8.0, and 8.5, respectively, is solidified, it does not weakly crack upon impact, elasticity is secured, and strength is high. It did not collapse when taken out of the container. Further, it was found that the viable cell count of the microorganisms in culture survived 10 ⁶ or more in 1 g of the gel carrier.

Further, the pH is 8.1, 8.2, 8.3, 8.
The growth and immobilization products of the microorganisms adjusted to 4 all had viable cell counts on the order of 10 ⁸ to 10 ⁹ and were found to be optimal environments. Moreover, in this pH range, it is exceptionally stable and has a stable shape, does not crumble, crack, fluidize, or has an odor, is easy to carry and move, and is extremely easy to handle. Then, it was found that the cells could be cultured there, the PVA had elasticity, and the peelability from the container was excellent.

When the range of pH usable for the purpose of the present invention was measured, it was pH 6.5-8.5.

By the way, in the pulp wastewater treatment process diagram shown in FIG. 1, the concentration of odorous components was measured. Measurement point is N
O. 2 Clarry 1 machine drainage (M / C drainage) point M
₁ , NO. 5 Clarry 2 machine drainage (M / C drainage) point M ₂ , NO. 3 Clari 4 raw point wastewater M ₃ ,
NO. 4 Clari 5 raw wastewater point M ₄ , odorous wastewater 9
From the point M ₅ , the point M ₆ of drainage of the settling tank 8 after aeration, and the point M ₇ of the general drainage port 3 to the sea.

The measurement conditions are as follows: For 10t / day odorous drainage, 400m in the aeration tank 7 of 10m ³ which constitutes the flow path.
Inject 10 growth-immobilized products of g / microbe, and 3
The sedimentation tank ⁸ m 3 and three charged proliferation immobilizate same microorganism as described above, was observed after day changes in 30 days.

As a result, the order of concentration of odorous components after 15 days was as shown in the following table.

[0041]

[Table 1]

From the table, the concentration of the four components of hydrogen sulfide (H ₂ S), methyl mercaptan (MM), methyl disulfide (DMS) and dimethyl disulfide (DMDS) is highest in the odorous wastewater. Therefore, although it should have the highest impact on the total wastewater, it can be seen that the microbial treatment is sufficiently performed in the settling tank 8. Especially, hydrogen sulfide (H ₂ S) has a large tendency.

The effluent components of the total effluent were hydrogen sulfide (H ₂ S) 0.005 ppm, methyl mercaptan (MM) 0.002 ppm, and methyl disulfide (DMS).
Of 0.01 ppm and dimethyl disulfide (DMDS) of 0.
It was 06 ppm.

[0044]

Industrial Applicability According to the present invention, a microorganism is transplanted in a gel carrier containing a water-soluble silicic acid compound and polyvinyl alcohol as main components and containing a medium and water. The final pH is preferably 6.5. ˜8.5, more preferably 8.1 to 8.4, the growth and immobilization product of microorganisms is arranged in the drainage liquid, and the malodorous components are deodorized by the microorganisms growing in the fixation product in the drainage liquid. Since it is a biological deodorizing method that differs from the conventional biological deodorizing method, since the microorganisms grow in the immobilized product, the viable amount of the microorganisms increases and the biological deodorizing ability is significantly improved.

Further, since it is a malodor method that prevents the source of malodor from the root, fundamental deodorization is secured. In addition, it is not a gas level of malodor, but a method that can decompose the malodorous components in the wastewater in the preceding stage in the previous stage of diffusing into the wastewater, so it is possible to regulate by the concentration of the malodorous components in the wastewater. It is possible to effectively deal with the regulation of the offensive odor prevention law.

Further, in particular, the survival of the microorganisms is ensured in the gel carrier to ensure good growth, and the microorganisms can be released into the aquatic environment in a sustained manner, and even if installed in a predetermined environment, it is good. Since the proliferation is repeated, a large amount of microorganisms can be continuously supplied locally at the installation location.

Further, the growth-immobilized product of the microorganism used in the present invention has a chemically stable composition and physical strength, and can be used for a long period of time. Moreover, since the water-soluble silicic acid compound and PVA are used as the main components of the gel carrier, they do not remain in the environment and destroy the environment, they have decomposition characteristics, and the decomposition products are not toxic. It can be released to the outside world such as the sea.

Further, the shape is stable, it does not crumble, crack, fluidize, has no odor, is easy to carry and move, is extremely easy to handle, and if it is filled in a container, it is cultured there. In addition, the elasticity of PVA provides excellent peelability from the container. Further, since it does not float in water, it can be easily settled on the bottom of the water and installed.

Therefore, a method is provided in which the microorganism immobilization product of the present invention is placed in a biological deodorizing tank through which the waste water passes, and the malodorous components are deodorized in the waste water by the microorganisms growing in the immobilization product. Of course, it is possible to deodorize offensive odor components by microorganisms growing in the immobilization product in the passing drainage liquid by appropriately arranging it wherever the drainage liquid passes, without providing a special biological deodorizing tank. You can also

[Brief description of drawings]

FIG. 1 is a factory wastewater treatment process chart for explaining an embodiment of a biological deodorizing method according to the present invention.

[Explanation of symbols]

 1 NO. 2 Clary 2 NO. 5 Clary 3 Comprehensive drainage port 4 NO. 3 Clary 5 NO. 4 Clary 6 Cooling tower 7 Aeration tank 8 Settling tank 9 Odor drainage

Claims (12)

[Claims] 1. A gel carrier containing a water-soluble silicic acid compound and polyvinyl alcohol as main components, a medium and water, and a microorganism immobilized therein is provided with a growth and immobilization product of the microorganism, which is disposed in the drainage solution. , A biological deodorizing method, characterized in that a malodorous component is deodorized by a microorganism that grows in the immobilization product in wastewater. 2. A gel carrier containing a water-soluble silicic acid compound and polyvinyl alcohol as main components, a medium and water, and a microorganism immobilized therein is provided with a growth immobilization product of the microorganism, which is disposed in the drainage liquid. , A biological deodorizing method, characterized in that the generation of a bad odor is prevented by the microorganisms growing in the immobilization product in the wastewater. 3. The final pH of the growth-immobilized product is 6.5 to 8.
The biological deodorizing method according to claim 1 or 2, wherein the biological deodorizing method is adjusted to 5. 4. The final pH of the growth-immobilized product is from 8.1 to 8.
The biological deodorizing method according to claim 1 or 2, wherein the biological deodorizing method is adjusted to 4. 5. A polyvinyl alcohol as a growth immobilization product having an acetate residue of 30 to 40% and a polymerization degree of 500 to 20.
The biological deodorization method according to claim 1, 2, 3, or 4. 6. The biological deodorization method according to claim 5, wherein the mixture ratio of polyvinyl alcohol and the water-soluble silicic acid compound of the growth-immobilized product is 1.5 to 1. 7. The biological deodorizing method according to claim 1, 2, 3, 4, 5, or 6, wherein the microorganism of the growth-immobilized product is a photosynthetic bacterium. 8. The method for deodorizing a living organism according to claim 6, wherein the microorganisms of the growth-immobilized product are purple sulfur bacteria and / or purple red sulfur-free bacteria. 9. The microorganism according to claim 7, which is a microorganism belonging to one or more of the genus Rhodobacter, the genus Rhodopseudomonas, the genus Rhodosubilium, and the genus Chromatium.
The described biological deodorizing method. 10. The viable cell count of microorganisms in culture is 10 ⁶ or more in 1 g of a gel carrier of a growth-immobilized product.
The biological deodorizing method according to 7, 8 or 9. 11. The biological deodorizing method according to claim 10, wherein the viable cell count of the microorganism is 10 ⁶ to 10 ⁹ . 12. A microorganism, which comprises a plurality of genera adsorbed on sludge and / or humus, as claimed in claim 6, 7, 8, 9, 10 or 1.
1. The biological deodorizing method according to 1.