JP3476572B2 - Biological deodorizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological deodorizing device for biologically deodorizing malodorous gas generated from a water treatment facility.

[0002]

2. Description of the Related Art Sulfur compounds such as hydrogen sulfide and mercaptan tan, which are produced in the process of biological decomposition of organic matter, from the first settling tank, aeration tank, sludge thickening tank, etc. in human waste treatment plants and sewage treatment plants, and A malodorous gas containing a malodorous substance such as ammonia is generated.

Conventionally, the malodorous substances in the malodorous gas generated above are adsorbed and removed by an adsorbent such as activated carbon, a chemical absorption method by which they are absorbed and removed by an alkaline solution or a hypochlorous acid solution, and a carrier carrying microorganisms. The layer is treated by a biodegradation method or the like that is biologically decomposed and removed.

[0004]

The above-mentioned adsorption method and chemical absorption method have the drawbacks that the operating costs are high due to equipment costs and consumption of chemicals, and that complicated maintenance is required. The biodegradation method requires sophisticated techniques for controlling the growth of microorganisms and removing decomposition products, and since the optimum temperature for growing microorganisms is around 30 ° C, the deodorization efficiency is low when the temperature decreases, such as in winter. However, there is a drawback that the temperature control becomes complicated, such as heating is required to maintain the temperature, and the cost of heating the malodorous gas increases.

As a simple method of the biodegradation method, there is a method in which a malodorous gas is blown into the activated sludge mixed liquid in the aeration tank for treatment, but the contact between the malodorous gas and the activated sludge mixed liquid is extremely insufficient. Therefore, the malodorous components are not sufficiently absorbed and the deodorization efficiency is low.

Therefore, the present invention provides a deodorizing device which is low in equipment costs and operating costs, and which can be easily operated and managed. Therefore, in order to provide a simple method for treating malodorous gas by blowing it into the activated sludge mixture, It was made by paying attention and eliminating its drawbacks.

[0007]

Means for Solving the Problems The gist of the present invention to achieve the above object is to increase the circulation of an activated sludge mixed solution in a biological deodorization tank in a biological deodorizing apparatus for deodorizing malodorous gas with an activated sludge mixed solution. A flow path and a descending flow path are provided, an ascending air flow means is provided in the ascending flow path, a malodorous gas introducing means is provided in the descending flow path, a sprinkling means and a discharge path for the activated sludge mixed liquid are provided on the upper part, and the top part is provided. The biological deodorizing device is characterized in that it is provided with a discharge path for treated gas.

Further, the above-mentioned biological deodorizing apparatus is characterized in that a biological carrier carrying a microorganism having a degrading odor substance is dispersed and mixed in the activated sludge mixed solution in the biological deodorizing tank.

[0009]

[Function] When air is supplied from the air blowing means to the ascending flow path of the biological deodorizing tank filled with the activated sludge mixed liquid (hereinafter simply referred to as mixed liquid) supplied from the aeration tank, the circulating flow of the mixed liquid is generated by the air lift effect. It is caused.

When the malodorous gas generated from the water treatment equipment is introduced from the malodorous gas introduction means into the descending flow path of the biological deodorizing tank at the stage where the circulation flow of the mixed liquid is stable, the malodorous gas descends along with the circulation flow, The malodorous substance is absorbed while flowing into the ascending flow path from the communicating portion and flowing up through this path, and further biologically decomposed and removed by the microorganisms in the mixed liquid.

By mixing and mixing a biological carrier carrying sulfur-oxidizing bacteria and nitrifying bacteria capable of degrading malodorous substances in the mixed solution, the concentration of microorganisms per unit volume can be increased,
The resolution of malodorous substances can be increased.

Usually, most of the malodorous substances are removed in the above process, but depending on the content of the malodorous substances, the malodorous substances remain in the process gas emitted from the mixed solution into the voids in the tank. In some cases, it is absorbed by the novel mixed liquid sprinkled from the sprinkling means and is circulated and mixed in the liquid in the tank for treatment.

The processing gas from which the malodorous substance has been removed is diffused into the atmosphere from the discharge path of the processing gas together with the air for generating the circulation flow, and a part of the mixed liquid in the tank is discharged from the discharge path of the mixed liquid. Returned to the aeration tank.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an embodiment of the present invention, in which 1 is an inner cylinder and an outer cylinder.
This is a biological deodorization tank having a heavy-cylinder structure, which is integrally attached to a side portion of the aeration tank 10, and has a mixed liquid ascending passage 2 inside the inner cylinder and a mixed liquid descending passage 3 between the inner cylinder and the outer cylinder. And has a communicating portion at the upper end and the lower end to form a circulation flow path for the mixed liquid to be filled.

The biological deodorization tank 1 is preferably attached integrally to the side of the aeration tank 10 in order to save the installation area, but it may be arranged separately from the aeration tank 10.

The ascending flow path 2 is provided with a blowing means 5 for blowing air supplied from an air supply blower 12, and the descending flow path 3 is provided with a bad smell gas introduction means 4 supplied from a malodorous gas supply blower 11. The biological deodorizing tank 1 is provided with a sprinkling means 6 for the mixed liquid and a discharge passage 7 for the mixed liquid, and a discharge passage 8 for the treated gas at the top.

The air blowing means 5 and the malodorous gas introducing means 4 may be a tube provided with a plurality of nozzles, or an air diffusing tube or the like normally used in water treatment equipment. The air supplied is the supply blower 1
2 is supplied, but it is also possible to branch and supply the air for biological treatment sent from the aerated air supply blower 13 to the aeration tank 10. In that case, especially the supply blower 12
Need not be provided.

Further, the means for sprinkling the mixed solution 6 has the aeration tank 10 via the mixed solution supply passage 9 and the mixed solution supply pump 14.
It is preferable that a large number of spray nozzles are arranged on the plane at substantially equal intervals so that uniform water sprinkling is performed on the upper part of the ascending flow path 2, but it is not limited to this. The discharge passage 7 for the mixed liquid is preferably connected to the aeration tank 10 via an overflow member.

A malodorous substance is obtained by dispersing and mixing a microbial carrier carrying sulfur-oxidizing bacteria and nitrifying bacteria capable of decomposing malodorous substances in the mixed liquid of the biological deodorization tank 1 to increase the concentration of microorganisms per unit volume. It is also preferable to improve the decomposition efficiency of the microbial carrier, and examples of the microbial carrier include activated carbon, humus, a carrier in which microorganisms are vegetatively propagated on the surface of synthetic resin particles, polyvinyl alcohol, polyethylene glycol and the like. The carrier may be entrapped and immobilized.

When the gas to be treated contains a large amount of organic sulfur compounds which are difficult to be decomposed by microorganisms, they may remain in the treated gas. Therefore, an activated carbon adsorption tower is provided in the subsequent stage to further adsorb and clean the adsorption gas. It is preferable to diffuse into the atmosphere after chemical conversion treatment.

Next, the operation of the biological deodorizing apparatus having the above structure will be described below. The biological deodorizing tank 1 is filled with the mixed liquid supplied from the aeration tank 10 via the mixed liquid supply passage 9 by the mixed liquid supply pump 14. When air is supplied to the ascending flow path 2 from the air blowing means 5, a circulating flow of the mixed liquid is generated due to the air lift effect.

When the malodorous gas generated in the water treatment facility is introduced from the malodorous gas introducing means 4 into the descending flow path 3 of the biological deodorizing tank 1 at the stage where the circulation flow of the mixed liquid is stable, the malodorous gas descends along with the circulation flow. Then, the malodorous substance is absorbed while flowing into the ascending flow path 2 from the communicating portion at the lower end and flowing up through the main passage, and further biologically decomposed and removed by the microorganisms in the mixed liquid.

When a biological carrier carrying sulfur-oxidizing bacteria or nitrifying bacteria capable of degrading malodorous substances is dispersed and mixed in a mixed solution, the concentration of microorganisms per unit volume is increased and the resolution of malodorous substances is increased. be able to.

Further, most of the malodorous substances are usually removed in the above process, but depending on the content of the malodorous substances, etc., they remain in the treated gas emitted from the mixed solution into the voids in the biological deodorization tank 1. In some cases, it is supplied by the mixed solution supply pump 14 from the mixed solution supply passage 9 connected to the aeration tank 10, absorbed by the new mixed solution sprayed from the sprinkling means 6, and circulated and mixed in the solution in the tank. Will be processed.

The processing gas from which the malodorous substances have been removed is diffused into the atmosphere from the processing gas discharge passage 8 together with the air for generating the circulating flow, and a part of the mixed liquid in the tank is discharged from the mixed liquid. It is returned from 7 to the aeration tank 10.

[0026]

According to the biological deodorizing apparatus of the present invention, the following effects can be obtained. The conventional adsorption method or chemical absorption method requires high operating costs due to equipment costs, consumption of chemicals, etc., and requires complicated maintenance.In the conventional biodegradation method, microbial growth control and decomposition production are required. In addition to requiring sophisticated technology to remove things, heating is required to maintain deodorization efficiency during periods such as winter when the temperature drops, and temperature control is complicated and heating of malodorous gas is required. Although the cost is high, the odorous gas is blown into the activated sludge mixture that has an appropriate temperature for treatment, so it is not easily affected by changes in temperature, and chemicals are not used, so equipment costs and operating costs are low. is there.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

[Explanation of symbols]

1: Biological deodorization tank 2: Ascending channel 3: Downward flow path 4: Odorous gas introduction means 5: Air blowing means 6: means for sprinkling activated sludge mixture 7: Activated sludge mixed liquid discharge channel 8: Process gas discharge path 9: Activated sludge mixed liquid supply path 10: Aeration tank 11: Bad smell gas supply blower 12: Air supply blower 13: Aerated air supply blower 14: Activated sludge mixed liquid supply pump

Claims (2)

(57) [Claims] 1. A biological deodorizing device for deodorizing malodorous gas with an activated sludge mixture, wherein an ascending flow path and a descending flow path for circulating the activated sludge mixed solution are provided in the biological deodorization tank, and air is provided in the ascending flow path. A biological deodorizing device characterized in that it is provided with a blowing means for the above, a means for introducing a malodorous gas in the descending flow path, and a sprinkling means and a discharge path for the activated sludge mixed liquid in the upper part and a discharge path for the treated gas in the top part. apparatus. 2. The biological deodorizing apparatus according to claim 1, wherein a biological carrier carrying a microorganism having a capability of degrading malodorous substances is dispersed and mixed in the activated sludge mixed solution in the biological deodorizing tank.