JPH09313871A - Horizontal biological deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a biological deodorizing device free from the generation of channeling or short pass, capable of decreasing the height and reducing floor space by providing a microorganism adherent material made of a long sized fiber having no space in the upper end and dipped into water in the lower end in the inside of a biological treating vessel. SOLUTION: A feed port 5 for a gas to be treated and a discharge port 6 for the gas to be treated are provided respectively at one end side and another end side in the longitudinal direction of the horizontally long rectangular biological treating vessel 1. And many long sized fiber made biological adherent material 10, the upper end of which is fixed with a fixing member to the upper wall of the vessel 1 so as not to generate the space between the upper end and the upper wall of the vessel 1 and the lower end of which is hung down as a free end, is provided over almost whole cross sectional surface so as to cross to the passing direction of the gas to be heated. And a washing water is sprayed by a spray means 3 on the biological adherent material 2 and the water level of a trap part 4 is controlled so that the lower end of the biological adherent material 2 is dipped into water. Thus, the biological deodorizing device is formed into the horizontal type, the floor space is reduced and the height is decreased and the pressure loss is low and the deodorization efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological deodorizing apparatus for biologically decomposing malodorous components in malodorous gas discharged from sewage treatment plants, human waste treatment plants and various factories.

[0002]

2. Description of the Related Art Malodorous components in malodorous gas produced from the above-mentioned sewage and night soil treatment plants are mainly hydrogen sulfide, methyl mercaptan, sulfur compounds such as methyl sulfide and methyl disulfide, and ammonia.

Since the above substances can be decomposed by microorganisms, a biological deodorizer for deodorizing malodorous gas is used by a biological treatment tank having a microorganism-depositing part for retaining and accumulating microorganisms decomposing malodorous components. ing.

[0004] As the microbial engraftment material for engrafting the above-mentioned microorganisms, a material having a large surface area, in which the microorganisms can be well established and propagated, and which can maintain a high deodorizing efficiency for a long time, is preferable. Bundles, soils, peats, porous ceramics and activated carbon are mainly used.

In addition, in the microbial engraftment part, the acidic component produced by the biological oxidative decomposition of the malodorous component may lower the pH and inhibit the growth of the microorganism, so that the product should be washed and removed. , Water is appropriately washed to replenish the water necessary for habitation of microorganisms.

As the cleaning water used for the water spray cleaning, activated sludge treated water of sewage, river water, groundwater, etc. are generally used, and the water spray cleaning is either continuous water spraying or intermittent spraying at predetermined time intervals. It is done by watering.

As a conventional biological deodorizing apparatus, a microbial growth part supporting microorganisms in a high biological treatment tank is provided in a height direction of 1
A biological deodorizing device is generally used, which is provided with stages or a plurality of stages and is spray-washed by a single washing means.

Further, a plurality of biological treatment tanks are provided, and a biological deodorizing device connected in series through a pipeline (Japanese Patent Laid-Open No. 5-115742).
No.) or a horizontally elongated biological treatment tank, and a biological deodorizing device (Japanese Unexamined Patent Publication No. 4-363111) in which a horizontal horizontally microbial colonization section is provided in one stage and water is sprayed and washed by a multi-stage cleaning means.

[0009]

In the above-mentioned conventional biological deodorizing apparatus, a biological deodorizing apparatus is provided in which a plurality of stages of microbial growth portions are provided in a height direction in a high biological treatment tank and water is washed by a single washing means. However, in general, a certain amount of water is required within a limited time, and as the number of stages increases, the amount of wash water supplied increases. The effect on efficiency cannot be ignored.

Further, even if the microbial growth portion is divided in the height direction and a plurality of stages of microbial growth portion are provided, the height of the biological treatment tank naturally increases as the number of stages increases, so that the height of the indoor treatment chamber is increased. In places where it is necessary to keep the temperature as low as possible, there is a limit to the number of stages that can be installed, and there is the disadvantage that the number of stages cannot be increased to improve the deodorizing effect.

Further, in the biological deodorizing apparatus described in Japanese Patent Laid-Open No. 5-115742, in which a plurality of biological treatment tanks are connected in series by pipelines, the more biological treatment tanks are provided, the more ancillary equipment such as piping. Requires a large area, and the installation area of the entire apparatus becomes unnecessarily large and the apparatus configuration becomes complicated.

Further, in the biological deodorizing apparatus described in Japanese Patent Application Laid-Open No. 4-363111, in which a horizontal horizontally long microbial growth section is provided in a horizontally long biological treatment tank, it is provided above the microbial growth section. In addition, there is a drawback that the gas to be treated is short-passed in the arrangement portion of the water sprinkling means and the liquid accumulation portion below and the deodorization efficiency is lowered.

When soil, peat or the like is used as the microbial engraftment material described above, it is inexpensive and has a large surface area per unit volume and a high deodorizing effect, but it tends to be compacted, resulting in high pressure loss and short-term. The amount of processing gas per unit volume decreases during that period, and there is a possibility that clogging may occur due to long-term use.

Although the pressure loss of ceramics and activated carbon is lower than that of the above-mentioned soil, peat, etc., the pressure loss is apt to increase due to the growth of microorganisms and the inclusion of foreign substances. There are problems that the control of the growth of microorganisms becomes complicated and the price of the carrier is expensive.

Furthermore, in the case of using the above-mentioned microbial growth material, due to the influence of gravity or sprinkled water, a density gradient is likely to occur in the vertical direction of the microbial growth part, and the gas to be treated is circulated in the horizontal direction. If this is done, there is also a problem that a drift is likely to occur.

[0016]

Means for Solving the Problems The gist of the present invention for solving the above-mentioned problems is to provide a biological deodorizing apparatus for deodorizing malodorous gas by a biological treatment tank having a microbial engraftment section,
The biological treatment tank is in the shape of a horizontally-long rectangular body, the gas to be treated inlet is provided at one end in the longitudinal direction, and the processing gas outlet is provided at the other end, with the upper end inside the biological treatment tank. The microbial engraftment material consisting of a large number of long fibers that are attached by an attachment member provided near the upper wall so as not to create a gap with the upper wall and hang down with the lower end as a free end is treated. The microbial-growth portion provided over substantially the entire cross-section that intersects in the gas flow direction, sprinkling means for spraying cleaning water to the microbial-growth portion, and the water level so that the bottom of the microbial-growth portion is immersed in the bottom part It is a horizontal biological deodorizing device characterized in that a regulated liquid reservoir is provided.

Further, the above-mentioned apparatus is a horizontal type biological deodorizing apparatus characterized in that a plurality of stages for microbial growth are provided in the biological treatment tank in the longitudinal direction.

With the horizontal biological deodorizing device having the above-mentioned structure, the installation area and height of the biological deodorizing device can be made as narrow as possible and can be made as low as possible, and since the pressure loss is extremely low, the number of stages of the microbial growth part can be arbitrarily increased, and the microbial growth can be performed. Since there is no density gradient in the raw part, uneven flow does not occur and deodorization efficiency is improved.

Further, the gas to be treated does not short-pass and the deodorizing efficiency does not decrease. Further, in an apparatus provided with a plurality of microbial growth parts, an appropriate amount of water is sprinkled for each microbial growth part. By setting, the deodorization efficiency can be improved,
Also, in sprinkling and washing of each microbial growth part, there is no influence between the microbial growth parts due to the waste water after washing,
It is possible to maintain a good habitat for microorganisms.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view of a partial cutout of a biological deodorizing apparatus according to an embodiment of the present invention, FIG. 2 is a vertical sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is a schematic side view of a partial cutout, and FIG. 4 is a schematic side view of a partial cutout according to another embodiment. The same reference numerals are used for corresponding members.

Reference numeral 1 is formed in a horizontally long rectangular shape, and one end side in the longitudinal direction thereof is provided with a processing gas supply port 5 and the other end side is provided with a processing gas discharge port 6. The biological treatment tank is configured to flow in the direction.

Inside the biological treatment tank 1, the upper end is fastened by a fastening member 11 provided in the vicinity of the upper wall of the biological treatment tank so that no gap is formed between the upper wall and the free end. A microbial growth part 2 in which a microbial growth material 10 composed of a large number of long fibers hanging down as a whole is provided over substantially the entire cross section crossing in the flow direction of the gas to be treated, and the upper part of the microbial growth part 2 is washed. A water sprinkling means 3 for spraying water and a liquid reservoir 4 in which the water level is adjusted so that the lower part of the microbial growth material 10 is immersed in the bottom part are provided.

From the viewpoint of good vegetative growth of microorganisms, pressure loss, gas-liquid contact efficiency, etc., the microbial epiphytic material 10 is described in Japanese Utility Model Publication No. It is preferable that a long fiber bundle is formed by forming a large number of synthetic fiber yarns, such as polypropylene or vinylon, in a loop shape capable of preventing run-down loss, and further, the fiber bundle is a synthetic fiber in which microorganisms easily grow. A bundle of a large number of thin yarns, and a thick synthetic fiber yarn for reinforcement to prevent the shape from collapsing,
It is preferable that each is formed in a loop shape and is bundled in large numbers to form a long string.

In addition, the above-mentioned microbial engraftment material 10 is appropriately fixed by suspending the upper ends of a large number of long fibers on an attachment member 11 such as a gold braid, a slit plate or a horizontal rod, and fixing it to the upper wall of the biological treatment tank 1. It is provided so that no gap is formed between the microbial growth part 2 and the microbial growth part 2, and the lower end thereof is hung down as a free end, but the lower part of the microbial growth material 10 is provided so as to be immersed in the liquid in the liquid pool part 4.

Further, the water sprinkling means 3 is provided in the vicinity of the upper wall of the biological treatment tank 1 in the same manner as in the device shown in FIG. It is preferable that a large number of spray nozzles are horizontally arranged at substantially equal intervals along the microbial growth portion 2, but as in the device shown in FIG. 4, the spray nozzles are arranged vertically. It is also preferable that a plurality of them are arranged.

In the liquid reservoir 4 provided at the bottom of the biological treatment tank 1, the cleaning wastewater may be combined and retained for a certain amount, and then discharged as it is from the drain discharge pipe 8 as drainage. It is also preferable to provide a washing water circulation channel for circulating the water sprinkling means 3 to the microorganism-growth part 2 and appropriately circulate the washing waste water.

In FIGS. 3 and 4, the microbial growth part 2 is shown.
Are provided in multiple stages in the biological treatment tank 1 in the longitudinal direction,
Hydrogen sulfide, ammonia, etc., which are easily dissolved in water and easily decomposed by microorganisms, are absorbed and decomposed first, and organic sulfur compounds, etc., are difficult to be absorbed, and most of them are absorbed and decomposed in the microbial engraftment part in the latter stage, so that the settlement Since the microorganisms may be different, the cleaning waste water after cleaning which remains in the liquid pool 4 may be mixed, but each microorganism pool 2 is partitioned so as not to mix, and each liquid pool is used as cleaning water. It is also preferable to provide a washing water circulation flow path for circulating the washing waste water staying in the portion 4 to the water sprinkling means 3 to the respective microbial growth portions 2.

The operation of treating a malodorous gas with the biological deodorizing device having the above-mentioned structure will be described below. A gas to be treated containing a malodorous component generated in human waste or a sewage treatment plant is sucked by a suction blower (not shown), and the gas to be treated is supplied through an air supply pipe 5
To the biological treatment tank 1.

The supplied odorous gas to be treated is a microbial-growth material 10 comprising a large number of long fibers of the microbial-growth section 2.
During the horizontal cross flow through the gaps between the groups, the malodorous components are absorbed by the water retained in the microbial epiphytic material 10 and biologically decomposed by the epiphytic microorganisms for cleaning. The cleaned offensive odor gas is discharged as a processing gas from the processing gas outlet 6 into the atmosphere through an exhaust pipe (not shown).

In the above description, there is no gap between the upper end of the microbial growth part 2 and the upper wall of the biological treatment tank 1, and the lower part of the microbial growth part 2 is immersed in the water accumulated in the liquid pool part 4. Therefore, there is no fear that the gas to be horizontally circulated will be sheet-passed, and no density gradient will occur in the microbial engraftment portion, so that no deviated flow will occur and the deodorization efficiency will not decrease.

The malodorous components contained in the malodorous gas are mainly hydrogen sulfide, sulfur compounds such as methyl mercaptan and ammonia, which are decomposed by microorganisms into sulfuric acid, nitric acid and the like. In addition, the production of acidic components such as sulfuric acid may lower the PH of the microbial-growth site, but watering as described below can maintain the PH value suitable for the growth of microorganisms.

The microorganisms can be settled on the microbial growth portion 2 at the initial stage of operation by only sprinkling biologically treated water such as human waste or sewage, but the microbial growth material 10 is placed on the activated sludge for several hours. By immersing it for a while, the deodorizing efficiency in the steady state can be obtained even faster.

The sprinkling of water on the microbial growth part 2 is continuously or intermittently sprinkled from a sprinkling nozzle of the sprinkling means 3 through a wash water supply pipe 7 by a water supply pump (not shown). By this watering, the supply of nutrients necessary for the growth of microorganisms and the moist state are secured, the growth of microorganisms is promoted, and the sulfuric acid and excess microorganisms produced by the decomposition of the malodorous components can be washed and removed. It is possible to maintain the above, and to prevent excessive settlement of microorganisms.

The water used for the sprinkling may be industrial water, tap water, etc., but biologically treated water such as human waste or sewage appropriately contains microorganisms and nutrients, and also contains alkaline components. Therefore, it is preferable for the growth of microorganisms and the maintenance of a suitable pH, and the washing waste water after washing may be used as appropriate.

In the microbial decomposition of the malodorous component, P
The H value is an important factor, and its value also differs depending on the type of malodorous component.
For organic sulfur compounds such as methyl mercaptan and methyl sulfide having a pH of 4 or less, a PH range of 5 to 6 is the optimum PH range.

Further, in the microbial growth part 2 on which the microorganisms have settled, hydrogen sulfide, ammonia, etc., which are easily dissolved in water and easily decomposed by the microorganisms, are absorbed and decomposed first, and the organic sulfur compounds, etc. are delayed in absorption and decomposition. In the process in which the malodorous gas sequentially flows through the plurality of microbial-growth parts 2, hydrogen sulfide, ammonia and the like are mainly absorbed and decomposed in the microbial-growth part 2 in the preceding stage, and the decomposition products thereof are sulfuric acid and nitric acid. Acidic components such as, for example, accumulate, the PH value becomes extremely low, and the organic sulfur compound is removed by the microbial growth part 2 in the subsequent stage.

In the apparatus provided with a plurality of microbial growth parts 2 of the present invention, water is sprayed individually by the water spraying means 3 provided above each microbial growth part 2, and the waste water after washing is used for other microorganisms. Since it does not pass through the settlement section 2, it does not affect the microorganisms carried in the microorganisms settlement section 2 of the latter stage by the low-pH washing drainage of the preceding stage, and the microbial settlements of the respective microorganisms settlement section 2 are always maintained. The condition can be maintained in an environment suitable for habitation of microorganisms.

The cleaning wastewater after the sprinkling and cleaning of the microorganism-adhering portion 2 is merged in the liquid pool portion 4 of the biological treatment tank 1 and retained for a certain amount, and then discharged as drainage from the drain discharge pipe 8 as it is. Alternatively, it is also preferable that the cleaning waste water, which is divided for each microbial growth portion 2 and stays in a certain amount, is circulated and used as each cleaning water, and a part of the cleaning waste water is joined and then discharged as the cleaning waste water.

Further, the flow rate of the malodorous gas in the biological treatment tank 1 is preferably 0.1 to 0.5 m / sec,
At a flow rate of 0.1 m / sec or less, a nonuniform flow of the gas flow is likely to occur, and at a flow rate of 0.5 m / sec or more, an increase in pressure loss in the microbial growth part 2 is likely to occur.

[0040]

INDUSTRIAL APPLICABILITY According to the present invention, since the installation area and height of the biological deodorizing device can be made as narrow and low as possible, and the pressure loss is extremely low, the number of stages of the microbial engraftment portion can be arbitrarily increased and the deodorizing efficiency can be improved. It is possible to achieve, and because a density gradient does not occur in the microbial engraftment portion, a non-uniform flow does not occur, and the deodorizing efficiency does not decrease because the gas to be treated is not likely to short-pass, and further, In sprinkling and washing the respective microbial-growth sites with water, since there is no influence between the microbial-growth parts due to the waste water after the washing, the habitat environment of the microorganisms can be kept good.

[Brief description of drawings]

FIG. 1 is a schematic side view of a partial cutout of a biological deodorizing apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along line AA of FIG.

FIG. 3 is a schematic side view of a partial cutout provided with a plurality of microbial settlements.

FIG. 4 is a schematic side view of a partial cutout according to another embodiment.

[Explanation of symbols]

 1: Biological treatment tank 2: Microorganism engraftment part 3: Sprinkling means 4: Liquid reservoir part 5: Supply port for gas to be treated 6: Discharge port for process gas 7: Supply pipe for washing water 8: Drain discharge pipe 10: Microorganism Epiphytic material 11: Engagement member

Claims (2)

[Claims] 1. A biological deodorizing apparatus for deodorizing malodorous gas in a biological treatment tank having a microorganism-growth part internally provided, wherein the biological treatment tank has a horizontally long rectangular body shape, and the gas to be treated is provided on one end side in the longitudinal direction thereof. Of the feed gas and a discharge port for the treatment gas at the other end, and the upper end is provided inside the biological treatment tank near the upper wall of the biological treatment tank so that no gap is formed between the upper and the upper wall. Thus, a microbial growth material comprising a large number of long fibers suspended with the lower end as a free end, a microbial growth portion provided over substantially the entire cross-section intersecting the direction of gas flow to be treated,
A horizontal biological deodorizing device comprising: a sprinkling means for spraying washing water to the microorganism-growth part, and a liquid pool part having a water level adjusted so that the lower part of the microorganism-growth part is immersed in the bottom part. 2. The horizontal biological deodorizer according to claim 1, wherein a plurality of stages for microbial settlement are provided in the biological treatment tank in the longitudinal direction.