JPH11169649A - Microbial deodorization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat the complex odors contg. plural odor components in addition to ammonia by microbial deodorization. SOLUTION: This apparatus is provided with a plurality of deodorization tanks 1 and 11 housing carriers 3 and 13 carrying microorganisms and an odor introducing pipe 12 of the deodorization tank 11 of the rear stage is connected to a discharge pipe 4 of the deodorizatibn tank 1 of the fore stage. The gaseous ammonia is deodorized by the deodorization tank 1 of the first state and the other odors are deodorized by the deodorization tank 11 of the rear stage. As a result, the ammonia in the odors is efficiently treated by the deodorization tank of the first stage and the other odor components are treated by the deodorization tanks of the second and subsequent stages, by which the composite odors are efficiently deodorized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an organic waste composting plant, sewage treatment plant, livestock barn, etc.
The present invention relates to a microorganism deodorizing device capable of efficiently treating a complex odor containing ammonia gas.

[0002]

2. Description of the Related Art Conventionally, a method using microorganisms has been known as a method for deodorizing odors generated in composting plants for organic waste, sewage treatment plants, livestock pens, and the like. In this method, microorganisms are carried on a carrier, the carrier is housed in a deodorizing tank, odor is sent into the deodorizing tank, and odor components are decomposed and deodorized by the activity of the microorganisms. As an example of this deodorizing device, a carrier 26 carrying microorganisms 20 is accommodated in a deodorizing tank 25 provided with an odor introducing pipe 25a and an exhaust pipe 25b. Is provided with a water receiving portion 27 which receives water which is sprayed on the carrier 26 and partially permeates the carrier 26. The water receiving portion 27 is connected to a water storage tank 28 installed outside the deodorization tank 25, and water in the water storage tank 28 is sprinkled on the carrier 26 by a water sprinkling device 29. This watering,
As described above, a part passes through the carrier 26 and
7 and then circulates by flowing back to the water storage tank 28.

In operation of the above apparatus, activated sludge or the like (not shown) is mixed in a carrier 26, and odor is introduced into the deodorization tank 25 from an odor introduction pipe 25a. , And water is sprayed toward the carrier 26 and the activated sludge. Then, the microorganisms contained in the activated sludge gradually grow by being provided with appropriate moisture and a substrate, are gradually fixed to the carrier, and decompose the odor. Also, due to the water spray, some microorganisms move together with water, and a part of odor components and decomposition products generated by the activity of microorganisms are dissolved in the water and carried away. Since this water is once stored in the water storage tank 28, a decomposition reaction of microorganisms using these components as a substrate occurs in the water storage tank 28, and the deodorizing performance is enhanced.

[0004]

By the way, the odor generated by the above-mentioned equipment contains a plurality of odor components such as ammonia gas. Corresponding presence and activity of multiple types of microorganisms are required. However, since a plurality of microorganisms have different optimum activity environments, it is difficult at present to effectively deodorize the microorganisms with the complex odor as described above. The present inventor has conducted research on improving the deodorizing performance of the above-described complex odor, and when the composite odor contains ammonia gas as described above,
The carrier and sprinkled recovery water p
H was found to be high. It has been found that when the pH is increased in this manner, the environment becomes difficult for microorganisms that treat odors other than ammonia to act, so that the function is deteriorated and the overall deodorizing performance is reduced. The present invention has been made in view of the above circumstances. First, ammonia is removed in a first-stage deodorizing tank, and other odors are treated in a second-stage deodorizing tank, thereby effectively deodorizing a complex odor. It is an object of the present invention to provide a microorganism deodorizing device that can perform the method.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, among the present invention, a microorganism deodorizing apparatus according to a first aspect of the present invention accommodates microorganisms and a carrier carrying the microorganisms, and comprises an odor containing ammonia gas. After deodorizing the microorganisms by taking it into the inside, in a microorganism deodorizing device provided with a deodorizing tank to exhaust to the outside, while having a plurality of the deodorizing tank,
The deodorizing tanks are connected in series so that the exhaust gas of the preceding deodorizing tank is taken into the latter deodorizing tank, and the first deodorizing tank is assigned to deodorize ammonia gas.
The deodorization tank in the latter stage is characterized by being assigned to deodorization of other odors.

In a second aspect of the present invention, in the first aspect of the present invention, the microorganism deodorizing apparatus comprises: a water spraying device for sprinkling water on the carrier; and a water storage tank for collecting the water sprinkled from the deodorizing tank and storing it again for water sprinkling. At least the first stage deodorizing tank is provided with a dedicated sprinkler and a water storage tank, and the dedicated water storage tank and sprinkler is provided only between the first deodorizing tank and the first deodorizing tank. It is characterized in that the sprinkled water is collected and sprinkled.

A third aspect of the present invention is the microorganism deodorizing apparatus according to the first or second aspect, wherein nitrifying bacteria are attached to the first-stage deodorizing tank, and bacteria for treating other odors are provided in the second-stage deodorizing tank. It is characterized by being attached.

[0008] The present invention aims at deodorizing a complex odor containing ammonia as an odor component. Examples of the generation source include a composting plant, a sewage treatment plant, and a livestock barn as described above. However, the present invention is not limited to these, and any source may be used as long as it generates an odor including ammonia. The concentration of ammonia to be treated is not particularly limited, but the present invention is particularly effective in deodorizing a complex odor containing ammonia gas of 5 ppm or more. This is because when the odor contains ammonia gas of 5 ppm or more, the pH of the carrier or the water collected by sprinkling significantly increases.

Further, in order to deodorize the above-mentioned complex odor, nitrifying bacteria are used in the present invention for decomposing ammonia gas. Since the function of the first-stage deodorizing tank is to deodorize ammonia gas, it is desirable to attach nitrifying bacteria that decompose ammonia gas to the first-stage deodorizing tank. The nitrifying bacteria are mainly composed of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria, but the present invention is not limited to the above-described bacteria, and the ammonium-oxidizing bacteria and nitrite-oxidizing bacteria are balanced. Those that are well mixed are desirable. In the subsequent deodorization tank, it is desirable to activate other microorganisms alone or in a mixture of plural types so as to be compatible with the odor component intended for deodorization.

[0010] As described above, inorganic or organic materials such as zeolite, charcoal, slag, ceramics, activated carbon, and PVA gel can be used as the carrier for supporting the microorganisms. In fixing the microorganisms described above to the carrier, conventionally, the method is carried out by mixing activated sludge with the carrier, and this method can be employed in the present invention, but is not particularly limited to this method. Instead, for example, bacteria that have been cultured in advance may be added. In particular, when attaching nitrifying bacteria in the first-stage deodorizing tank, it is effective to use nitrifying bacteria which are preferentially cultured while suppressing the growth of other bacteria. The preferential culture can be performed by defining an appropriate medium, environment and the like and culturing. As a result, the number of nitrifying bacteria is desirably 99% or more of the total number including other bacteria. The concentration of nitrifying bacteria, while added to the water storage tank with medium before driving into the water ¹⁰⁶
It is desirable that there be at least 1 / l. In addition, the said nitrifying bacteria can be sprayed on a carrier by throwing into a water storage tank together with a liquid medium and spraying water. By spraying together with watering in this manner, it can be uniformly added to the carrier.

As a deodorizing tank for accommodating the carrier, in a large-scale apparatus, a hole can be dug in the ground and this hole can be used as a deodorizing tank, and an appropriate container can be used as a deodorizing tank. . The deodorization tank is provided with an intake section for taking in odors and an exhaust section for exhausting deodorized gas. In this deodorization tank, two or more stages are connected in series such that exhaust gas from the preceding deodorization tank is sent to the intake of the subsequent deodorization tank. However, in the first-stage deodorizing tank, the odor intake section is naturally connected to the source of the odor, and in the final-stage deodorizing tank, the exhaust section is directly opened to the atmosphere or an appropriate exhaust equipment is provided. And so on. The number of the deodorizing tanks is not limited as long as the number is two or more.

Each of the deodorizing tanks is further provided with a water collecting section for collecting sprinkled water. For example, when a carrier is accommodated in a hole in the ground, a water barrier layer such as a sheet may be provided to prevent water from penetrating into the ground, and water may be taken from the barrier layer and stored in a water storage tank. The water stored in the water storage tank is supplied to a watering facility by a pump or the like, and water is sprayed from the watering facility to the carrier. The structure of the watering equipment and the watering method are not particularly limited as the present invention. However, in the first-stage deodorizing tank, it is desirable to provide a dedicated water storage tank and a sprinkler so that water circulates only through the deodorizing tank.
This is because if the water storage tank and water sprinkler are shared with other deodorizing tanks, the dissolved water will dissolve ammonia, raise the pH of the water, and sprinkle it into other deodorizing tanks to treat odors other than ammonia. This is to inhibit the action of the microorganisms. In the deodorization tanks of the second and subsequent stages, it is possible to install a separate water storage tank and water sprinkler and share them with multiple deodorization tanks. If it has an adverse effect on the deodorizing tank, it is also possible to provide a dedicated water storage tank and a sprinkler for the specific deodorizing tank as described above.

[0013]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. This deodorizing apparatus has a two-stage deodorizing tank. The first-stage deodorizing tank 1 has a box shape, has a water-permeable shelf 1a at the bottom thereof, and has an odor near the ceiling. An odor introduction pipe 2 is connected as an intake section, and the odor introduction pipe 2 is connected to an odor source and a blower (not shown). Further, in the deodorizing tank 1, a carrier 3 made of zeolite particles is accommodated so as to be supported by the shelf 1a. Further, below the shelf 1a of the deodorization tank 1, an exhaust pipe 4 which is connected to the next-stage odor introduction pipe 12 through the side is connected, and a water receiving section 1b is secured. One end of the return pipe 5 is connected to the water receiving portion 1b. The other end of the return pipe 5 is connected to a water storage tank (water storage tank) 6. In the water storage tank 6, a water pump 7a connected to the suction side of the pump 7 is arranged, and to the discharge side of the pump 7, a water sprinkling section 8 is connected via a water sprinkling pipe 8a. The part 8 is located above the carrier 3 in the deodorization tank 1. The pump 7, the water pump 7a, the water sprinkler 8a, and the water sprinkler 8 constitute a water sprinkler. In addition, the second-stage deodorization tank 11
Has substantially the same configuration as the above, and has the above-described odor introduction pipe 12 and an exhaust pipe 14 connected to exhaust equipment (not shown).
And a shelf 11a and a water receiving portion 11b. A carrier 13 made of zeolite grains is stored on the shelf 11a. In addition, a connecting pipe 15 is provided in the water receiving portion 11b.
The connecting pipe 15 is connected to a water storage tank 16 in the same manner as described above. And this water storage tank 16
A sprinkler for pumping water from the pump and spraying water on the carrier 13 is a pump 1
7. It is constituted by a water pump 17a, a water sprinkler 18a, and a water sprinkler 18. As shown above, two deodorization tanks 1
Numeral 11 has a dedicated water storage tank and a sprinkler.

Next, the operation of the deodorizing device will be described. Nitrifying bacteria are preferentially cultured in a liquid medium in advance,
The nitrifying bacteria 20a are added to the water 6a in the water storage tank 6 together with the medium. Then, the odor containing ammonia is supplied into the deodorization tank 1 through the odor introduction pipe 2, and the pump 7 is operated to pump water from the water storage tank 6 together with the nitrifying bacteria 20 a by the pumping pipe 7 a so that the water sprinkling pipe 8 a is discharged. Then, water is sprayed from the water spraying section 8 toward the carrier 3. A part of the water is passed between the carriers 3 and the water is transferred from the shelf 1a to the water receiver 1
b, and further circulates by returning to the water storage tank 6 through the return pipe 5. During this circulation, the nitrifying bacteria 20a gradually attach to the carrier 3 while growing, and the attached nitrifying bacteria 20a also gradually grow. This nitrifying bacterium 2
The ammonia component in the odor is surely decomposed by Oa, and a part thereof is similarly decomposed in the water storage tank 6. In this way, the ammonia is decomposed, and the odor gas containing almost no ammonia is sent from the exhaust pipe 4 to the next-stage deodorizing tank 11 through the odor introduction pipe 12.

In the deodorizing tank 11, an activated sludge supernatant (not shown) is added to the deodorizing tank 11 and sufficiently mixed with the carrier 13 before the operation. This activated sludge supernatant usually contains nitrifying bacteria, but nitrifying bacteria grow slower than other bacteria, so if ammonia-treated odor is sent to this deodorization tank, other Bacteria 20b grow preferentially, and bacteria 20b substantially other than nitrifying bacteria
Is attached. The operation in the deodorization tank 11 is the same as the operation in the deodorization tank 1, and odor components other than ammonia, for example, hydrogen sulfide are decomposed by sulfur-oxidizing bacteria. At this time, water is applied to the carrier 13 in the same manner as described above, and the water that has moved to the water receiving portion 11b is stored in the water storage tank 1
6 and used again for watering. The gas from which ammonia has been removed in the first-stage deodorization tank 1 and the odor component hydrogen sulfide has been removed by the deodorization tank 11 has been sufficiently deodorized, and is sent from the exhaust pipe 14 to exhaust equipment (not shown). . In this embodiment, the deodorizing tank is provided in two stages, but three or more deodorizing tanks can be provided as necessary.

[0016]

EXAMPLE In order to evaluate the performance of the deodorizing apparatus of the above embodiment, a single-stage deodorizing apparatus having only one deodorizing tank having substantially the same capacity as the total capacity of the first and second deodorizing tanks. Is prepared as a conventional example, and 30
An odor containing 0 ppm, 10 ppm of hydrogen sulfide, and 7 ppm of methyl mercaptan was deodorized by each of the above apparatuses.
As a result, in the apparatus of the embodiment, when the components of the gas exhausted in the second-stage deodorization tank were analyzed, the ammonia concentration was <0.1 ppm, the hydrogen sulfide concentration was <0.01 ppm,
The methyl mercaptan concentration was <0.01 ppm.
On the other hand, in the conventional device, the ammonia concentration of the exhaust gas is 1 p.
pm, the concentration of hydrogen sulfide was 0.1 ppm, and the concentration of methyl mercaptan was 0.1 ppm. From this result, it became clear that ammonia and other odors were efficiently treated by treating ammonia in the first-stage deodorizing tank.

[0017]

As described above, according to the deodorizing apparatus of the present invention, a plurality of deodorizing tanks are provided, and the deodorizing tanks are connected in series so that the exhaust gas of the former deodorizing tank is taken into the latter. Further, the first-stage deodorization tank is assigned to deodorize ammonia gas, and the second-stage deodorization tank is assigned to deodorization of other odors. Thus, ammonia is efficiently treated in the first-stage deodorization tank. Since the other odor components are efficiently treated in the second and subsequent stages, efficient deodorization can be performed even for complex odors.

A plurality of sprinklers for sprinkling water on the carrier and a plurality of water tanks for collecting sprinkled water from the deodorizing tank and storing the sprinkled water again for watering are provided. By allocating the water sprinkler and the water storage tank, it is possible to avoid the adverse effect caused by spraying the collected water to another deodorization tank, and it is possible to perform deodorization more efficiently. Furthermore, if nitrifying bacteria are attached to the first-stage deodorizing tank, and bacteria for treating other odors are attached to the second-stage deodorizing tank, the function of each deodorizing tank can be maximized to achieve the purpose. The odor can be more efficiently treated.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a deodorizing device according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a conventional deodorizing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deodorizing tank 2 Odor introduction pipe 3 Carrier 5 Return pipe 6 Water storage tank 7 Pump 7a Pumping pipe 8a Sprinkling pipe 8 Sprinkling part 11 Deodorizing tank 12 Odor introduction pipe 13 Carrier 15 Return pipe 16 Water storage tank 17 Pump 17a Pumping pipe 18a Sprinkling pipe Watering part 20 Microorganism 20a Nitrifying bacteria 20b Other bacteria

Continuation of front page (72) Inventor Kenji Fukushima 1-6-1, Funakoshiminami, Aki-ku, Hiroshima-shi, Hiroshima Japan Steel Works Co., Ltd.

Claims (3)

[Claims] 1. A microorganism deodorizing apparatus comprising a deodorizing tank containing a microorganism and a carrier carrying the microorganism, taking in an odor including ammonia gas therein, deodorizing the microorganism, and exhausting the odor to the outside. In addition to having a plurality of the deodorizing tanks, the deodorizing tanks are connected in series so that the exhaust gas from the preceding deodorizing tank is taken into the subsequent deodorizing tank. A microbial deodorizer characterized by being assigned to gas deodorization, and a subsequent deodorization tank being assigned to deodorization of other odors. 2. A water spraying facility for sprinkling water on the carrier, and a plurality of water storage tanks for collecting the sprinkled water from the deodorization tank and storing the water for re-sprinkling, are provided in at least the first stage deodorization tank. A dedicated sprinkling facility and a water storage tank are allocated, and the dedicated water storage tank and the sprinkling facility ensure that the water collected and sprinkled only with the first-stage deodorizing tank is collected and sprinkled. The microorganism deodorizing device according to claim 1, characterized in that: 3. The method according to claim 1, wherein nitrifying bacteria are attached to the first-stage deodorizing tank, and bacteria for treating other odors are attached to the second-stage deodorizing tank. Microbial deodorizer