JPH0438430B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a deodorizing filter used to treat malodorous components in malodorous gases using microorganisms or enzymes that perform deodorizing action. [Conventional technology] Human waste treatment plants, sewage treatment plants, waste treatment plants, slaughterhouses, food factories, fish iliac treatment plants, pig farms, poultry farms,
Odors are a problem in pulp manufacturing plants. Such malodorous components generally include ammonia, hydrogen sulfide, methyl sulfide, mercaptan,
The main component is amines, and all of them contain nitrogen atoms as in ammonia and amines, and sulfur atoms as in hydrogen sulfide, methyl sulfide, and mercaptans. Conventionally, combustion methods, activated carbon adsorption methods, cleaning methods, etc. have been known as deodorization methods to remove these malodorous components, but in recent years, biological deodorization methods using microorganisms have become popular due to their low running costs, etc. It has attracted attention because of its advantages, and the development of such devices is progressing. For example, methods utilizing the biochemical reactions of aerobic bacteria have been proposed, as in Japanese Patent Application Laid-Open No. 57-200158. This method removes malodorous components from the malodorous gas by bringing the malodorous gas containing ammonia, hydrogen sulfide, methyl sulfide, mercaptan, amines, etc. into gas-liquid contact with a culture medium containing aerobic bacteria. The content is to make malodorous components odorless by oxidizing and reducing them with enzymes. However, as an example of the gas-liquid contact, a filling section is mentioned, but no specific example thereof is given. In addition, in JP-A No. 59-98717, the filler is made of molded products such as wood chips, or porous molded products such as acetate non-woven fabric, glass wool, asbestos, unglazed ceramics, wood chips, synthetic resin, etc. in spherical and cylindrical shapes. JP-A No. 62-7425 discloses that the filling material is wood, porous stone, unglazed or synthetic resin. There is a planar or spherical body with a side length of 5 mm to 50 mm, but it is difficult to secure a flow path for gas-liquid contact when using such a filler. It wasn't enough. Furthermore, in Japanese Patent Application Laid-Open No. 61-271017, a gas absorbing liquid consisting of water or nutrient salt water is sprayed onto malodorous gases.
It has been proposed to bring the absorbent solution into contact with immobilized microorganisms after dissolving and absorbing malodorous components to make them odorless. There are problems with the amount of liquid used, and when the absorbing liquid is recycled, there is a risk of releasing malodorous components that have been absorbed. On the other hand, Japanese Patent Application Laid-open No. 62-221354 proposes impregnating a paper filter with a large number of small through holes with a microorganism liquid that causes malodor, and disposing this filter as a cassette in a malodorous air flow path. has been done. As a specific example, the cassette body is made into a block shape by stacking a plurality of sheets of corrugated paper so that the small through holes formed by the corrugated paper inside are all lined up in the same direction. The cassette body of the filter is impregnated with a bacterial enzyme solution or a solution consisting of an enzyme solution and a bacterial solution that performs a deodorizing action, and is placed in the foul-smelling air path. [Problems to be Solved by the Invention] In the device disclosed in JP-A No. 62-221354, the small through holes are linear flow paths, and the foul-smelling air is dispersed by the number of small holes, and a certain amount of gas-liquid contact is achieved. However, when the amount of gas to be processed increases, the deodorizing efficiency is not sufficient, and in order to improve the deodorizing efficiency, a large number of cassettes are required, resulting in an increase in the size of the entire device. There are some disadvantages as well. The purpose of the present invention is to eliminate the disadvantages of the conventional example,
It is an object of the present invention to provide a deodorizing filter that can effectively carry out gas-liquid contact and has good deodorizing efficiency. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a deodorizing filter to which microorganisms or enzymes that perform a deodorizing action are attached or impregnated. A filter layered member having a group of through holes is a block-shaped filter layered member, and a plurality of filter layered members having this through hole group are stacked in a layered manner in the penetration direction, and the through holes between adjacent filter layered members are The gist is that the positions of the small holes in the hole group are combined with deviations. [Function] According to the present invention, malodorous air collides with the cardboard filter in the flow path and disperses into the small through holes of the filter. This filter is built with multiple layers of through-holes,
Since the positions of the pores in each layer are shifted, the foul-smelling air that enters the pores always collides with the pore edges at the entrance of each layer, and then disperses and enters the next layer of pores. The flow of malodorous air always becomes turbulent and comes into contact with the pore walls, where it comes into contact with malodor-producing microorganisms and is deodorized. Furthermore, the filter can be easily replaced as a cassette, and since it is made of paper, used filters can be easily disposed of by composting or drying and burning. [Examples] Examples of the present invention will be described in detail below. First, the overall structure of the filter will be explained. The filter 1 is made into a block body by stacking a large number of through holes 2a formed by the corrugated paper core 2b of the corrugated cardboard 2 so that they are all lined up in the same direction. This block-like member is referred to as a filter layer member 3. The filter layered members 3 are stacked one on top of the other so that the directions of the small through holes 2a are the same. Here, the layer thickness b (length of the small through hole) of the filter layered member 3 is 20 mm to 250 mm.
degree is preferred. FIG. 1a is an exploded perspective view showing a first embodiment of the deodorizing filter of the present invention, and FIG. 1b is a perspective view of the same.
In the case where the filter layered members 3 are stacked in this manner, in this embodiment, every other filter layered member 3 is turned over so that the front and back sides are stacked alternately. Although the medium 2b is made of corrugated paper with a nearly sinusoidal waveform, the groups of through holes 2a are combined with the positions of the holes shifted. Figures 2a and 2b show a second embodiment of the present invention, in which the filter layered members 3 are stacked so that the continuous direction of the corrugated cardboard 2b, that is, the stacking direction of the corrugated cardboard, is perpendicular to each other. . In this case, the direction of the mountain of core 2b is
This results in a 90° difference, and the through holes 2a group are also combined with the positions of the holes shifted. Furthermore, as a third embodiment, as shown in FIGS. 3a and 3b, by slightly shifting the cuts of the inserts 2b at the edges of the filter layered members 3, when the filter layered members 3 are overlapped, the inserts 2b The top of the mountain may be slightly shifted. In this case, almost the same thing as in the first embodiment is obtained, but the crests of the waves in the middle 2b are completely reversed alternately and do not shift by half a pitch, but shift by less than half a pitch. It is. In addition, the types of corrugated cardboard corrugation heights include A flute, which has a corrugated height of approximately 4.8 mm, B flute, which has a corrugated height of approximately 2.5 mm, and B flute, which has a corrugated height of approximately 3.7 mm. What is called a degree C flute,
There is also a flute called E flute with a flute height of about 1.2 mm. Therefore, as shown in Figures 4a and 4b, the fourth
As an example, the filter layered members 3 to be combined have different sizes of small through holes 2a. In this way, the small and large through holes 2a are combined, and the positions of the small through holes 2a are shifted. On the other hand, in all of the first to fourth embodiments, the filter layered member 3 has been described in which the cardboards 2 are stacked in parallel, but as shown in FIGS. 5a and 5b, the cardboards 2 are stacked in a spiral shape. The cylindrical filter 1 may be formed by stacking the layered members 3 of the filter made in the same manner as shown in the first to fourth embodiments. Such a cardboard filter 1 is attached to or impregnated with a microbial solution or an enzyme solution that performs a deodorizing action. A culture cultured in a solid medium is dissolved in water and impregnated by spraying or immersion. Microorganisms that carry out the deodorizing action include those selected from cellulose-degrading bacteria, filamentous fungi, sulfur bacteria, air nitrogen-fixing bacteria, rhizobia, sulfur bacteria, actinomycetes, yeast, and pseudomonas bacteria. Depending on the situation, a plurality of microorganisms may be mixed. In this way, the cardboard filter 1 impregnated with the microorganisms that perform the deodorizing action can be used alone or in combination with a frame etc. to form a cassette body, with small through holes 2a arranged in the odor air path in the direction of air flow. It is placed so that foul-smelling air can pass through. At that time, the foul-smelling air hits the cardboard filter 1 in the flow path, and the small through hole 2a of the filter 1
Disperse and enter within. This filter 1 is built with multiple layers of through-holes 2a, and the positions of the holes 2a in each layer are shifted, so the foul-smelling air that has entered the holes 2a is always small at the entrance of each layer. It collides with the pore edge and disperses into the next layer of small pores 2a group. The flow of foul-smelling air always becomes turbulent and comes into contact with the walls of the pores, where it comes into contact with the microorganisms that carry out the deodorizing action and is deodorized. On the other hand, the used filter 1 can be easily disposed of by burning it or composting it. Next, a test on the deodorizing performance of the filter of the present invention was conducted using a testing apparatus as shown in FIG. 6, and the results are shown below. In FIG. 6, 4 is a deodorizing column, and 5 is a H ₂ S gas cylinder. Test 1 Deodorizing tower column 100mmφ x 500mm Filter used (1) A 100mmφ x 200mm filter made by stacking B flute single-sided cardboard in a spiral shape. (2) A filter made by stacking two B-flute single-sided corrugated cardboard layers stacked in a spiral shape, each measuring 100mmφ x 100mm. (3) A filter made by laminating B-flute single-sided corrugated cardboard in a spiral shape to a size of 100mmφ x 50mm, and stacking four of these filter layered members. (4) A filter made by laminating B-flute single-sided cardboard in a spiral shape to a size of 100 mmφ x 25 mm, and stacking 8 of these filter layered members. Filter installation location Center of deodorizing tower column (150mm from the bottom of the column) Microorganisms used Mainly sulfur bacteria Amount of water to be replenished 130g/day (amount of water that does not dry the filter) Amount of malodorous gas fed 8.12/min Malodorous gas Flow rate 2.0cm/s (contact time with filter 10s) Deodorizing column inlet concentration of malodorous gas 5ppmH ₂ S
The results of an experiment conducted under (constant) conditions for 30 days are shown in Table 1 below.

[Table] Test 2 Deodorizing tower column 100mmφ x 500mm Filter used (1) A filter made by stacking B flute single-sided cardboard in a spiral shape to a size of 100mmφ x 25mm, and stacking 8 of these filter layered members. (2) B-flute single-sided cardboard is stacked in a spiral shape to make 100mmφ x 25mm, six filter layered members and E-flute single-sided cardboard are stacked in a spiral shape to make 100mmφ×25mm, and this filter layered member 2 A filter that overlaps individual pieces in the shape of BBEBBEBB. (3) 100 consisting of B flute and E flute
4 mmφ×25mm filter layer members each
Filters are used individually and stacked in the shape of BEBEBEBE. Filter installation location Center of deodorizing tower column (150mm from the bottom of the column) Microorganisms used Mainly sulfur bacteria Amount of water to be replenished 130g/day (amount of water that does not dry the filter) Amount of malodorous gas fed 8.12/min Malodorous gas Flow rate 2.0cm/s (contact time with filter 10s) Deodorizing column inlet concentration of malodorous gas 5ppmH ₂ S
The results of an experiment conducted under (constant) conditions for 30 days are shown in Table 2 below.

〔Effect of the invention〕

As described above, the deodorizing filter of the present invention is a paper filter that removes malodorous components using microorganisms or enzymes that perform a deodorizing action. The flow can always be made turbulent, resulting in effective gas-liquid contact and efficient deodorization.

[Brief explanation of drawings]

Fig. 1a is an exploded perspective view showing the first embodiment of the deodorizing filter of the present invention, Fig. 1b is a perspective view of the same in the assembled state, Fig. 2a is an exploded perspective view showing the second embodiment, and Fig. 2b is the same as the above. Figure 3a is an exploded perspective view showing the third embodiment; Figure 3b is a perspective view of the same assembled state; Figure 4a is an exploded perspective view showing the fourth embodiment; Figure 4b is the same as the above. A perspective view of the assembled state,
Fig. 5a is an exploded perspective view showing the fifth embodiment; Fig. 5b is an exploded perspective view showing the fifth embodiment;
The figure is a perspective view of the assembled state of the same as above, and FIG. 6 is an explanatory view of the apparatus used for conducting the test. 1...Filter, 2...Cardboard, 2a...
Small through hole, 2b...Inner core, 3...Filter layered member, 4...Deodorizing column, 5... _H2S gas cylinder.

Claims (1)

[Scope of Claims] 1. A deodorizing filter attached or impregnated with microorganisms or enzymes that perform a deodorizing action,
The filter is made of a block-shaped filter layered member made by laminating a large number of cardboard boxes and having a group of through holes, and a plurality of filter layered members having the through hole groups are stacked in a layered manner in the penetration direction. A deodorizing filter, characterized in that the positions of the small holes in the group of through holes between adjacent filter layer members are offset from each other when combined. 2. The deodorizing filter according to claim 1, wherein the positional deviation of each small hole in the group of through holes is made such that the stacking direction of the cardboard is orthogonal to the adjacent filter layer members. 3. The deodorizing filter according to claim 1, wherein the deviation in the position of each small hole in the group of through holes is formed by overlapping the small through holes of different sizes in the filter layered member.