JPH09313874A - Biological deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an eliminating ratio of an odorous component and also to stably maintain high deodorizing effect for a long period. SOLUTION: In an biological deodorizing tank, plural stages of biological filter layers 41 are provided at the intermediate portions while supported with supporting plates 5, and a water spraying means 42 is arranged at the upper part and an introduction pipe 43 is provided at the lower part. A water collecting recessed groove 51 in the supporting plate 5 is provided on the peripheral part and many communication holes 52 communicated vertically are provided on a plate part of the supporting plate 5 at the inner side than the water collecting groove 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing device for decomposing and removing malodorous gas generated from food waste, human waste, sewage, food sludge and the like, and particularly to malodorous gas (hereinafter referred to as malodorous gas). The biological deodorizing device that biochemically decomposes).

[0002]

2. Description of the Related Art Methylcaptan, hydrogen sulfide, methyl sulfide, methyl dioxide, trimethylamine, acetaldehyde, styrene and the like are typical examples of harmful odorous gases generated from the above-mentioned garbage, and a device for removing these odorous gases is used. Various proposals have been made. An example of a biological deodorizing device that has been conventionally used will be described with reference to FIG.

The odorous gas generated by the malodorous source device 1 which becomes a malodorous source such as a facility for receiving raw garbage, human waste or food sludge, a storage device, an aeration device, a dehydration device or a composting device is washed by a blower 11. It is supplied to the tank 2. Here, while the odorous gas flows from the lower side to the upper side, the odorous gas passes through a Rahi ring-shaped medium layer 21 filled in the cleaning tank 2 and comes into contact with an absorption liquid such as cleaning water or diluted acid liquid supplied and dispersed by a pump 22 from above. By doing so, mainly the ammonia component is absorbed and removed. In addition,
This absorption liquid is taken out from the lower part of the cleaning tank 2 and is circulated and used. Further, an adjusting device including a pH meter (not shown) for adjusting the absorption performance of the absorbing liquid is provided.

Next, the odorous gas is introduced into the lower part of the biological deodorization tank 3. In this biological deodorization tank 3, a biological deodorization bed 31 is formed of, for example, peat moss deposited to a thickness of 1.8 m to 2.0 m, and an introduction pipe 32 for introducing odorous gas is provided below the peat moss. Further, a sprinkler pipe 33 is provided above. A drain pipe 34 is appropriately provided. The odorous gas that has passed through the cleaning tank 2 is introduced into the introduction pipe 32.
Introduced into the lower part of the biological deodorizing bed 31 by
While being dispersed, raised and passed through the inside of 1, the microorganisms in the biological deodorization bed 31 are biochemically decomposed and deodorized. The water sprinkling pipe 33 is used to appropriately control the humidity by sprinkling water on the biological deodorization bed 31 and appropriately maintain the habitat environment of microorganisms that decompose odorous gas.

However, in such a biological deodorizing apparatus, a biological deodorizing bed 31 formed by depositing peat moss or the like is used.
Causes volume contraction due to consolidation due to its own weight within a relatively short period from the start of service, and contracts to a thickness of 80 to 85% of the initial deposited thickness after about 6 months, for example. In addition to an increase in ventilation resistance, an upper and lower communication space, a so-called gas passage, which is caused by a crack generated due to contraction, is formed particularly near the inner wall surface of the biological deodorization tank 3 and develops over time. That phenomenon is recognized. Therefore, the cleaning odorous gas from the introduction pipe 32 passes through the gas passage from the lower side to the upper side without being deodorized, and the water sprinkling from the sprinkling pipe 33 simply passes through the gas passage from the upper side to the lower side. Therefore, there is a problem in that the desired effect cannot be obtained.

That is, since the passage of the odorous gas is short-circuited and the passing amount is unevenly distributed, a high removal rate of the odorous component cannot be obtained and it is difficult to cope with the load fluctuation. In addition, it becomes difficult to evenly control the humidity, and the partial drying of peat moss progresses to deteriorate the habitat environment of microorganisms that decompose odorous gas. A vicious cycle of inhibiting the metabolism of microorganisms occurs, making it difficult to maintain a stable deodorizing effect for a long period of time.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to improve the removal rate of odorous components and maintain a high deodorizing effect stably for a long period of time. A biological deodorizing device that can be used.

[0008]

[Means for Solving the Problems] The above problems are caused by a biological filter layer supported in the middle by a supporting plate and carrying microorganisms for decomposing odorous gas components, and a biological filter layer above the biological filter layer for controlling humidity. In a biological deodorizing apparatus including a biological deodorizing tank having a water sprinkling means for lowering and an odorous gas introducing pipe below, the biological filter layers are arranged in a plurality of stages at intervals, and the supporting plate is provided. A water collecting groove is provided around the
This can be solved by the biological deodorizing device characterized in that the plate portion inside the water collecting groove is provided with a large number of communication holes that communicate vertically.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an example of an embodiment of the present invention will be described with reference to the flowchart of FIG. The odorous gas from the malodorous source device 1, which is a malodorous source, is supplied to the cleaning tank 2 by the blower 11, where mainly the ammonia component in the odorous gas is absorbed and removed by the absorption liquid supplied from above by the pump 22. It is the same as the conventional example.

Next, the odorous gas is introduced into the lower part of the biological deodorization tank 3. In the biological deodorization tank 3, a biological filtration layer 41 carrying microorganisms for decomposing the odorous gas component is provided in an intermediate portion. A plurality of stages (three stages in this embodiment) are provided while being supported by the support plate 5. The biological filtration layer 41 is provided in a plurality of stages, preferably 3 to 5 stages, with a space provided in the vertical direction, and each of them is a peat moss, charcoal, activated carbon, or a filler such as coral pieces alone or a plurality thereof. The layers are appropriately combined to form a laminate or a mixture and have a thickness of 1.5 m or less, preferably 0.5 to
It was deposited to a thickness of 1.0 m.

Further, a spraying means 42 such as a spray nozzle for replenishing the biological filtration layer 41 with water to control the humidity is arranged above, and an introducing pipe 43 for introducing odorous gas is provided below. It is arranged.

The support plate 5 supporting the biological filtration layer 41 is provided with a water collecting groove 51 at the peripheral portion thereof along the inner wall surface of the biological deodorizing tank 3. A drain nozzle 53 for appropriately draining water from 51 is provided so as to project from the wall of the biological deodorization tank 3. Further, a large number of communication holes 52 are provided in the plate portion of the support plate 5 inside the water collecting groove 51, and the biological filtration layer 41 on the support plate 5 and the space under the support plate 5 communicate with each other. ing.

The operation of such a biological deodorizer will be described. The odorous gas derived from the foul-smelling source facility 1 is cleaned of ammonia components in the cleaning tank 2 and supplied from the introduction pipe 43 to the space below the lowermost support plate 5 of the biological deodorizing tank 4. Therefore, the odorous gas is guided to the upper biological filtration layer 41 through the communication holes 52 provided in the lowermost support plate 5, and when passing through the deodorizing microorganisms carried on the biological filtration layer 41, Odor components such as methyl mercaptan, methyl sulfide and trimethylamine are biochemically decomposed. Next, these odorous gases are used as the second biological filtration layer 41.
Furthermore, since it is similarly guided to the third-stage biological filtration layer 41, the deodorizing action is repeatedly performed, and the deodorization of the odorous gas is achieved. In this case, the speed at which the odorous gas passes through the biological filtration layer 41 is 30 to 80 cm / sec, preferably 40 to 60 cm / sec.

On the other hand, the humidity control water sprinkled from the water spraying means 42 such as a spray nozzle provided above the biological filtration layer 41 permeates the biological filtration layer 41 at the uppermost stage to evenly moisten it, and then an excessive amount of water. Part of the water content is sequentially dropped onto the biological filtration layer 41 in the lower stage through a large number of communication holes 52 of the support plate 5, and in the same manner as above, the biological filtration layer 41 in the lowermost stage is wetted, and the remainder of the excess water is Along the inner wall surface of the biological deodorization tank 3, the water is collected in the water collecting groove 51 provided in the peripheral portion of the support plate 5 and temporarily stays. In this case, since a part of the biological filtration layer 41 is in contact with the staying humidity-controlling water, when the biological filtration layer 41 becomes dry, the staying humidity-controlling water automatically supplies water. Biological filtration layer 41
Will always be conditioned with just enough. Then, the unnecessary excess water is finally discharged from the drain nozzle 53 as drain water.

Since the biological deodorizing apparatus of the present invention has the structure described above, since the biological filtration layer 41 is always properly controlled in humidity, the habitat of microorganisms for removing odorous components is always good. In addition to being maintained, a gas passage is rarely formed in the vicinity of the inner wall surface of the biological deodorizing tank 3, and the defect that the water repellency becomes apparent due to the local progress of drying is not generated. The gas passes through such a biological filtration layer 41 in a plurality of stages, so that the odorous components are efficiently removed and an excellent deodorizing effect is maintained for a long period of time.

Further, preferably, as shown in FIG. 1, a step portion 54 having a height increasing from the peripheral portion to the center of the supporting plate 5 and a flat portion following the step portion 54 are provided, and the flat portion has the above-mentioned plurality of portions. It is preferable to embody it so as to provide the communication hole 52. With this structure, the odorous gas introduced from below can be automatically collected on the back surface of the flat portion in order to increase and permeate from the bottom of the biological filtration layer 41 and the peripheral portion of the biological filtration layer 41. Can contact the humidity control water staying in the water collecting groove 51 over a wide area, so that the biological filtration layer 41 is more appropriately controlled in humidity, so that the gas passage is formed near the inner wall surface of the biological deodorization tank 3. Is less likely to occur, and even if a gas passage occurs, it does not intersect with the passage of odorous gas, so that the deodorizing effect is less likely to decrease.

In the biological deodorizing layer 4, if the outer peripheral wall of the water collecting groove 51 provided in the peripheral portion of the support plate is formed by the wall of the biological deodorizing tank 4, the structure is simple. There is an advantage to be. Further, when the biological filtration layer 41 is formed of deposited peat moss having a layer thickness of 1.5 m or less, the degree of consolidation due to its own weight is small and the ventilation resistance is remarkably increased even in the state where the humidity control water is absorbed. This is particularly preferable because it does not hinder the passage of odorous gas and a gas passage is unlikely to occur near the inner surface of the tank 3.

Next, Tables 1 and 2 show the deodorizing performance of the biological deodorizing apparatus of the present invention. Table 1 compares the deodorizing performances of the conventional example and the device of the present invention 20 days after the start of service.
Here, the raw gas is 4t of human waste oxidation-treated sludge and 4 of food sludge.
At the outlet of the cleaning tank 3, the raw odor gas derived from a composting device with a daily processing amount of 10 t, which is made of a mixture of t, litter of dung and 1 t of sawdust, is washed with diluted sulfuric acid to remove ammonia components. It was collected. Table 2 is also 6 months after the start of operation. In addition, the device of the conventional example,
The structure shown in FIG. 2 provided with a biological deodorization bed 31 having a thickness of 1.8 m, the apparatus of the present invention is a biological deodorization layer having the structure shown in FIG. 1 provided with three stages of biological filtration layers 41 having a thickness of 0.9 m. 41 is provided.

[0019]

[Table 1]

[0020]

[Table 2]

As is clear from Tables 1 and 2, in the conventional biological deodorizing apparatus, the deodorizing rate of each odor component is 5
It is shown that the deodorization rate remains in the range of 0 to 90%, and that there is a problem with long-term stability. However, in the biological deodorization apparatus of the present invention, the odor components after treatment are Most of the components had extremely low values (ND), which were not measurable (ND), and almost no change with time was observed even after 6 months, confirming a stable deodorizing effect for a long period of time.

The present invention is not limited to the embodiment shown in FIG. 1. For example, the shape of the deodorizing tank is a circular, elliptical, quadrangular or other polygonal horizontal cross-sectional shape, or a triangle, a rectangle, a shell shape, or a kamaboko. Various shapes such as vertical cross-sectional shape may be used, the material of the biological filtration layer, the deposition thickness may be different for each step, and the step shape of the support plate may be a top hat type, a cylindrical type, It may be a conical type or the like. Further, the communication hole of the support plate may be formed of a punching metal plate, a wire mesh plate, or the like. A device for adjusting the drain withdrawal height can be attached.

[0023]

Since the biological deodorizing apparatus of the present invention is constructed as described above, it is possible to improve the removal rate of odorous components and maintain a high deodorizing effect stably for a long period of time. In addition, the biological deodorizer of the present invention is small and lightweight, can be prefabricated, and is easy to assemble, disassemble, and relocate, so it is excellent in that it saves space, saves energy, eases site conditions, and saves construction costs. There is an effect. Therefore, the present invention has an extremely great industrial value as a biological deodorizing device that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a flow chart including a cross section of a main part for explaining an embodiment of the present invention.

FIG. 2 is a flowchart including a cross section of a main part of a conventional example.

[Explanation of symbols]

1 odor source device, 2 cleaning tank, 3 biological deodorizing tank, 4
1 biological filtration layer, 42 water sprinkling means, 43, introduction pipe, 5 support plate, 51 water collecting groove, 52 communication hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Suwa 4-11, Zenshin-cho, Minato-ku, Nagoya, Aichi Prefecture Grand Maison Fuji No. 202

Claims (4)

[Claims] 1. A biological filtration layer supported in the middle by a support plate and supporting microorganisms for decomposing odorous gas components, a sprinkling means for controlling the humidity of the biological filtration layer in the upper part, and a lower part in the lower part. In a biological deodorizing device including a biological deodorizing tank having an introduction pipe for introducing an odorous gas, the biological filtering layers are arranged in a plurality of stages at intervals, and a water collecting groove is provided in a peripheral portion of the supporting plate. The biological deodorizing device is characterized in that a plate portion inside the water collecting groove is provided with a plurality of communication holes that communicate with each other in the vertical direction. 2. The stepped portion, the height of which increases from the peripheral portion of the support plate toward the center, and the flat portion that follows the stepped portion are provided, and the flat portion is provided with the communication hole. The biological deodorizing device described. 3. The biological deodorizing apparatus according to claim 1, wherein an outer peripheral wall of the water collecting groove is formed by a wall body of the biological deodorizing tank. 4. The biological deodorizing apparatus according to claim 1, wherein the biological filtration layer has a thickness of 1.5 m or less.