JPH09122436A - Deodorizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove effectively hydrogen sulfide as an acidic odorous component. SOLUTION: In the constitution of a device, fillers are provided in multiple stages in a deodorizing column main body 1 with an introduction opening 2 for odorous gas on its lower section and an exhaust opening 3 for treated gas on its upper section, a circulating tank 10 is provided on the lower section of the deodorizing column main body 1, and water spray sections 8 and 9 for circulating liquid fed from the circulating tank 10 by using a pump 11 are provided above the fillers in respective stages. In that case, a filter 4 on the upper stage placed on a support plate 5 is pumice containing eluting silica, while a filler 6 on the lower stage placed on a support plate 7 is a solidified filter medium composed of pumice powder containing the eluting silica component impregnated with elute of a soil formed body composed mainly of a rotten plant or the rotten plant itself.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing device, and more particularly to a deodorizing device which effectively removes not only ammonia which is a basic odor component but also hydrogen sulfide which is an acidic odor component.

[0002]

2. Description of the Related Art Conventionally, as a method for deodorizing odorous gas using a humic plant, for example, a technique described in JP-A-2-290224 is known. The publication discloses a method of using a humic acid accelerator such as humic acid or fulvic acid to humify an organic substance in a liquid containing an organic substance, and deodorizing the liquid by contacting the liquid with an odorous gas. There is.

However, in this conventional method, although a removal rate of 100% is obtained for ammonia which is a basic odor component, hydrogen sulfide which is an acidic odor component is not completely removed. There is a point. Since hydrogen sulfide has a toxic and rotten egg-like odor even in a small amount, it is desired to be completely removed.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a deodorizing device that effectively removes hydrogen sulfide, which is an acidic odor component that could not be completely removed by the conventional method.

[0005]

A deodorizing apparatus according to the present invention which solves the above-mentioned problems has a packing material in a deodorizing tower main body having an odorous gas introducing port below and a treated gas discharging port above. Provided in multiple stages, provided with a circulation tank at the bottom of the deodorization tower body,
In a deodorizing device having a sprinkler for circulating liquid supplied from a circulation tank above each stage of packing material, at least one stage of packing material located above is pumice stone having a leachable silica component, and at least located below The one-stage packing material is at least one kind selected from a solid formed filter material obtained by impregnating a soil compact mainly composed of humus or an eluate of humus into a pumice powder having an elutable silica component. .

Further, according to the present invention, at least one stage of the packing material located above the packing material provided in multiple stages in the main body of the deodorizing tower is solidified by impregnating the eluate of the humus with the pumice powder having the elutable silica component. It is a filter medium, and at least one stage of the filler located below is a solid formed filter medium obtained by impregnating a pumice powder containing a leachable silica component with an eluate of a soil compact or a humus mainly composed of humus. At least 1
It is a seed. It is also preferable that the filler used in the present invention contains powdery or granular activated carbon.

A preferred embodiment of the present invention is to have a liquid pool for the filler around at least one stage of the filler located below.

As another preferred embodiment, there is provided a sludge culturing tank which is filled with at least one of soil powder, granules or compacts mainly composed of humus or pumice stone containing a leachable silica component. That is, the liquid in the circulation tank is introduced, and after culturing for a predetermined time, the liquid is returned to the circulation tank.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A soil formed body mainly composed of humus used in the present invention is a pellet formed by mixing humus soil, and optionally other inorganic material (eg magnesium), a binder or an elution limiting agent. The shape of the pellet may be any of a cylinder, a prism, a disk, and the like. As the humus, spores of useful microorganisms or those in which a large number of useful microorganisms live are preferably used, but it is more preferable that the humus contains an eluting silica component. As the pumice stone containing the leachable silica component, a pumice containing a silica component capable of being eluted into water in clay minerals or volcanic rocks is used.

Further, the solidified filter medium is obtained by granulating a fine powder of pumice containing a leachable silica component, impregnating it with a low-molecular colloid eluate extracted from a soil compact mainly composed of humic substances, and drying it. It can be made by repeating several times.

The filler used in the present invention may contain activated carbon. In the present invention, a pumice stone containing a leachable silica component and a granular activated carbon are used as a filler or alternatively, a powder or granular activated carbon is mixed in a soil compact mainly composed of humic substances to form a pellet. It can be used, or can be granulated by mixing powdered or granular activated carbon into the solidified filter medium.

In the present invention, the packing material is provided in multiple stages in the main body of the deodorizing tower, but the number of stages is preferably two in terms of manufacturing cost and treatment efficiency. When pumice stone is used in the upper stage, a soil compact mainly composed of humus or a solidified filter medium can be used in the lower stage. Before the odorous gas comes into contact with the pumice in the tower, it is effective in removing acidic odorous components such as hydrogen sulfide in addition to basic odorous components such as ammonia by contacting it with a soil humor-based compact. This is because it works.

When a solidified filter medium is used in the upper stage, a soil compact mainly composed of humus can be used in the lower stage.

In the present invention, the above-mentioned soil compact mainly composed of humus and the solidified filter medium can be mixed and used.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention. In FIG. 1, 1 is a deodorizing tower body, which is a cylinder,
It may be any of a square tube and the like, and below the tower body 1,
An odorous gas inlet 2 is provided, and a treated gas outlet 3 is provided above (including above the side surface). 4
Is an upper-stage filling material, and a support plate 5 is filled with a filling material 4 such as pumice or solidified filtration material. Filling height is 10
It is preferably about 50 mm. The support 5 may be a mesh or punching metal.

Reference numeral 6 denotes a lower-stage filling material, and a support plate 7 is filled with a filling material 6 such as a soil former mainly composed of humus. For the support plate 7, a mesh body or punching metal can be used. When using a filler having a high elution property as the upper and lower fillers 4 and 6, the support plate 5 of FIG.
It is also preferable to employ a structure as shown in FIG.

In FIG. 2, reference numeral 70 denotes a liquid pool, and the liquid pool 70 is filled with the filling material 6. Reference numeral 71 is a plurality of rising pipes that allow odorous gas to pass through, and the rising pipes 71 are provided with bubble caps 72. The top of the bubble cap 72 is sealed, and the odorous gas that has entered from below is discharged from the through holes 73 on the side, and the liquid reservoir 70
It has a structure that can be put in. Further, 73 is a gap 74 in the rising pipe 71.
It is a lid provided via the above, and has a structure in which the odor that has entered the rising pipe 71 enters the liquid pool portion 70 from the gap 74.
75 is a downcomer, and the liquid flowing out of the liquid reservoir 70 is sent downward.

Reference numeral 8 denotes a water sprinkling portion provided above the upper filling material 4, and 9 denotes a water sprinkling portion provided above the lower filling material 6, each of which is provided with a plurality of spray nozzles 81 and 91. Reference numeral 10 denotes a circulation tank provided in the lower part of the deodorizing tower main body 1, and the circulating liquid in the tank is sent to the sprinklers 8 and 9 via a pump 11, respectively. Reference numeral 12 denotes a reaction tank provided if necessary, and a filling section 13 filled with a pumice stone containing a leachable silica component and a soil former mainly composed of humus.
Is provided, and an air diffusing pipe 14 is provided therebelow, and the circulating liquid is sent to the reaction tank 12 via a pump 15 to decompose and assimilate odorous components.

In the present invention, since the odorous components move to the liquid side by the gas-liquid contact and then the decomposition and assimilation progress considerably in the circulation system, the reaction tank 12 is not always necessary.
When the load of odorous gas is high, the reaction tank 12 is provided to enable efficient long-term operation.

In order to promote the decomposition and assimilation of odorous components, a wire mesh basket or the like is filled with a soil compact mainly composed of pumice or humus having a leachable silica component in the circulation tank 10, It is also preferable to make it immersed.

[0021]

An embodiment of the present invention will be described below.

Example 1 An experiment was conducted under the following conditions using the deodorizing apparatus shown in FIG. As the filler, pumice stone containing an elutable silica component was used as the upper filler 4, and a soil compact (pellets of 4 mmφ × 10 mmL) mainly containing humus was used as the lower filler 6. A mesh body was used as the support plates 5 and 7. Other experimental conditions are as shown in Table 1.

[0023]

[Table 1]

The amount of odorous gas shown in Table 1 was introduced through the inlet 2, the tower body 1 was brought into contact with the circulating liquid in an upward flow, and the treated gas was discharged through the outlet 3.

Regarding the odorous gas, the concentrations of ammonia, which is a basic odorous component, and hydrogen sulfide, which is an acidic odorous component, at the odorous gas inlet port 2 and the treated gas outlet port 3 are defined by JIS.
It was measured by the method. Table 2 shows the results.

Example 2 The same experiment as in Example 1 was carried out except that the upper packing material 4 was replaced with the solidified filtration material and the lower packing material 6 was replaced with the solidified filtration material (particle diameter 5 mmφ). . Table 2 shows the results.

Comparative Example 1 An experiment was conducted in the same manner as in Example 1 except that pumice was not used and both the upper and lower fillers 4 and 6 were replaced with soil compacts mainly containing humus. Table 2 shows the results.

[0028]

[Table 2]

Example 3 In Examples 1 and 2 and Comparative Example 1, the state of hydrogen sulfide removal with respect to the number of days elapsed was examined, and the results are shown in FIG. FIG.
In, the line A shows the example 1, the line B shows the example 2, and the line C shows the comparative example 1.

As is apparent from FIG. 3, Examples 1 and 2
The removal rate was 100% after 10 days from the start of the experiment, but in Comparative Example 1, the maximum removal rate was 98% even after 15 days. Fifteen
After the day, the removal rate of hydrogen sulfide gradually decreased.

[0031]

According to the present invention, it is possible to effectively remove hydrogen sulfide, which is an acidic odor component which could not be completely removed by the conventional method. Further, according to the present invention, organic odorous components can also be effectively removed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a graph showing the hydrogen sulfide removal rate with respect to the number of days elapsed in the example of the present invention.

[Explanation of symbols]

 1: Deodorization tower 2: Inlet port 3: Discharge port 4, 6: Filling material 5, 7: Support plate 8, 9: Sprinkler section 10: Circulation tank 11, 15: Pump 12: Reaction tank 13: Packing section 14: Scattering Air part 70: Liquid pool part 71: Ascending pipe 72: Bubble bell 73: Through hole 74: Gap 75: Down pipe 81, 91: Spray nozzle

Claims (5)

[Claims] 1. A packing material is provided in multiple stages in a deodorization tower main body having an odorous gas introduction port below and a treated gas discharge port above, and a circulation tank is provided below the deodorization tower main body. In a deodorizing device having a sprinkling part of a circulating liquid supplied from a circulation tank above each stage of the filler, at least one stage of the filler located above is a pumice stone containing a leachable silica component,
At least one level of filler located below is the following (1) to (2)
A deodorizing device, which is at least one selected from the group consisting of: (1) Soil compact mainly composed of humus (2) Solidified filter material obtained by impregnating the eluate of humus into a pumice powder containing a leachable silica component 2. The deodorizing device according to claim 1, wherein the filler contains activated carbon. 3. A deodorizing tower main body having an odorous gas inlet on the lower side and an exhausted gas outlet on the upper side, is provided with a multi-stage packing material, and a circulation tank is provided below the deodorizing tower main body. In a deodorizing device having a sprinkling part of a circulating liquid supplied from a circulation tank above each stage of the packing material, at least one stage of the packing material located above is a pumice powder containing an eluate of a humic substance and a leachable silica component. A deodorizing device, which is a solidified filter material impregnated in, and in which at least one stage of filler material located below is at least one selected from the following (1) to (2). (1) Soil compact mainly composed of humus (2) Solidified filter material obtained by impregnating the eluate of humus into a pumice powder containing a leachable silica component 4. The deodorizing device according to claim 1, further comprising a pool portion for the eluate of the packing material around at least one step of the packing material located below. 5. A sludge culturing tank, which is filled with at least one of soil powder, granules or compacts mainly composed of humic substances, or pumice containing a leachable silica component, is provided inside the circulation tank. The deodorizing device according to claim 1, 2, 3 or 4, wherein the liquid in the container is introduced, and after culturing for a predetermined time, the liquid is returned to the circulation tank.