JPH0586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cleaning method in a gas deodorizing device using microorganisms.

[Prior Art] In recent years, biological deodorization methods have been attracting attention as gas deodorization methods because of their low processing costs and no risk of secondary pollution. In particular, various biological deodorization methods are currently under development in which microorganisms are immobilized in a packed bed, which saves space and enables highly efficient deodorization.

When microorganisms are immobilized in a packed bed, in order to maintain the activity of the microorganisms and prevent changes in the bacterial flora, it is necessary to periodically supply water to the microorganisms, and to ensure that the microorganisms decompose and assimilate malodorous components contained in the gas. It is necessary to wash away various products generated during deodorizing, and if this washing is insufficient, the activity of microorganisms will be inhibited, and the deodorizing effect will eventually be completely lost.

In order to increase the cleaning effect of the packed bed, it is most effective to increase the amount of washing water flowing per unit time, but when the amount of washing water is increased, the space inside the packed bed is reduced due to the presence of the washing water, and the ventilation is reduced. Problems occur such as a sudden increase in resistance and a decrease in removal efficiency due to the short pass of the odor gas.

In order to solve these problems, conventional methods have been to limit the amount of washing water per unit time, divide the packed bed into multiple stages in the flow direction of the deodorizing gas, and wash each stage sequentially to reduce the amount of water removed during cleaning. The effect of reduced efficiency was reduced.

An example of a cleaning device used in a conventional biological deodorizing method will be explained with reference to FIG. In the figure, 1 is a deodorizing tower, inside which there are multiple packed beds 2 in which packing materials (carriers) (not shown) are stacked, and microorganisms are immobilized on the surface of the carriers in each packed bed 2. . Reference numeral 3 denotes a water sprinkler device provided for periodically sprinkling water to the packed bed 2 in each stage, and is connected to a water supply pipe 6 via a pump 5 to a washing water tank 4 provided at the bottom of the deodorizing tower 1. , branch pipes 8 branched off from the water supply pipe 6 via valves 7 at each stage, and a large number of nozzles 9 attached to the branch pipes 8 for spraying cleaning water.

Next, its effect will be explained. The gas to be treated 10 is fed from the lower part of the deodorizing tower 1, and while rising and passing through the packed bed 2 of each stage, it is brought into contact with microorganisms immobilized on the surface of the carrier, and the gas 10 is contained in the gas to be treated by the microorganisms. Decomposes the malodorous components that are present. Products generated as a result of decomposition in the packed bed 2 of each stage are washed away from the surface of the carrier by periodically operating the water sprinkler 3 provided at each stage, for example, starting from the top stage. That is, first, only the valve 7 at the top stage is opened, and the pump 5 pumps the wash water in the wash water tank 4 through the water supply pipe 6 and the branch pipe 8, and the water is jetted from the nozzle 9 to spray water onto the packed bed 2 at the top stage.

Next, after sprinkling water for a certain period of time, the operation of the topmost water sprinkling device 3 is stopped, and the next water sprinkling device 3 is operated in the same manner as described above. Repeat this in order until the bottom row. In this way, the filling tank 2 at each stage is cleaned and the microorganisms are supplied with water.

The gas to be treated 10 is passed through the packed beds 2 at each stage to remove the malodorous components contained therein as described above, and is released into the atmosphere from the upper part of the deodorizing tower 1 as a treated gas 10a.

[Problems to be Solved by the Invention] The conventional cleaning method for a gas deodorizing device as described above has the following problems.

(1) Even during cleaning, there is a gas flow section within the packed bed,
In addition, since the amount of washing water per unit time is limited, the washing water tends to flow only into the easily flowing parts of the packed bed, making it impossible to wash the entire surface of the carrier that makes up the packed bed uniformly. It is difficult.

(2) If the product of a microbial reaction has a low or high PH, the PH value of the washing water changes as it flows from top to bottom, so it is necessary to make the PH value uniform in the packed bed by washing. Can not do it.

(3) During cleaning, the gas flow area is reduced due to the presence of cleaning water, so a so-called shoot pass occurs, and the removal rate of malodorous components in the gas to be treated is greatly reduced.

For this reason, the odor concentration of the processing gas fluctuates, and in some cases, the discharged processing gas may have to be further processed.

The present invention was made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a cleaning method for a gas deodorizing device that can perform quick and uniform cleaning and does not cause a decrease in deodorizing efficiency. It is something.

[Means for Solving the Problems] A cleaning method for a gas deodorizing device according to the present invention is such that the entire packed bed is immersed in cleaning water to be cleaned.

[Embodiments of the Invention] FIG. 1 is a diagram illustrating the principle of an embodiment of the present invention.
In the figure, reference numeral 1 denotes a deodorizing tower, which is composed of a main body 11 and a lid 12 detachably attached to the main body 11. 13 is a gas to be treated 1 provided at the bottom of the main body 11
0 is an inlet, 14 is a processing gas 1 provided in the lid body 12.
0a is a discharge port, and 15 is a drain discharge port provided at the bottom of the main body 11. 16 is a breathable bottom plate 1 at the bottom
7, and inside thereof, carriers having immobilized microorganisms on the surface thereof are laminated, and a packed layer 2 is provided.

Next, the operation of the present invention configured as described above will be explained. The gas to be treated 10 is fed into the deodorizing tower 1 through the inlet 13, and while passing through the packed bed 2, it comes into contact with microorganisms immobilized on the surface of the carrier, and the gas 10 is contained in the gas to be treated by the microorganisms. Decomposes malodorous components. The gas to be treated 10 from which the malodorous components contained therein have been removed becomes a treated gas 10a and is discharged into the atmosphere from the discharge port 14.

On the other hand, products generated as a result of the decomposition of malodorous components may accumulate in the packed bed 2, or moisture on the surface of the carrier may
When the PH value drops to a level that inhibits the activation of microorganisms, the supply of the gas to be treated 10 is stopped and the lid body 1 is closed.
2 and take out the container 16 from inside. and,
A container 16 is placed in a cleaning water tank (not shown) filled with cleaning water that has been prepared in advance and whose pH value etc. have been adjusted to a predetermined value.
and wash the packed layer 2. At this time, the container 16 may be swung vertically, horizontally, etc. within the washing water.

When the cleaning is finished, the container 16 is pulled up from the cleaning water tank, the water is drained, and the container 16 is put back into the deodorizing tower 1 and the lid 12 is closed. As a result, the product in the packed bed 2 is washed, water is replenished on the surface of the carrier, and the pH value is maintained at an appropriate level.

As described above, the present invention is characterized in that the entire packed bed 2 is immersed in cleaning water to be cleaned in a short time.

FIG. 2 is a schematic diagram of an embodiment of the present invention. The deodorizing tower 1 has a packed bed in which microorganisms are immobilized on the surface of a carrier.
The partition wall 18 separates the first filling layer 2a and the second filling layer 2b.
The gas to be treated 10 flows into the deodorizing tower 1 from the inlet 13 provided at the upper part of the deodorizing tower 1, and flows into the first packed bed 2a.
The air is then reversed at the bottom, and then passes through the second packed bed 2b and is emitted into the atmosphere from the outlet 14.

The lower part of the deodorizing tower 1 and the washing water tank 19 are connected to the water pipe 2.
0 and a water distribution pipe 21, and each is provided with a water pump 22, a water valve 23, a drain pump 24, and a drain valve 25.

In this embodiment configured as described above, the gas to be treated 10 is divided into the first filled layer 2a and the second filled layer 2b.
While passing through the gas, malodorous components are decomposed and removed, and the gas is released as an odorless process gas 10a. When cleaning the first and second packed beds 2a and 2b in the deodorizing tower 1, the water supply valve 22 is opened, the water supply pump 23 is operated, and water in the cleaning water tank 19 is supplied from the lower part of the deodorizing tower 1. The water level of the cleaning water sent into the deodorizing tower 1 gradually rises from the bottom, and when it reaches the lower edge 18a of the partition wall 18, the flow of the gas to be treated 10 stops. Furthermore, the water level rises, and the first packed bed 2a and the second packed bed 2
Stop the water supply when reaching the top surface of b. As a result, the first and second filled layers 2a and 2b are completely immersed in the washing water. Next, the drain valve 25 is opened and the drain pump 24 is operated to rapidly drain the wash water in the deodorizing tower 1 and return it to the wash water tank 19.

The water quality of the cleaning water is adjusted when the cleaning water is returned to the cleaning water tank 19, and in order to maintain the concentration of microbial products contained in the cleaning water below a level that does not inhibit the activity of the microorganisms, the water quality is adjusted until the set value is reached. At this point, some of the washing water is discharged, fresh water is replenished, and an alkaline agent for neutralization is supplied.

In this way, in this embodiment, the cleaning water is automatically supplied and drained, and the packed bed is immersed in the cleaning water as it is for cleaning.

FIG. 3 is a block diagram of another embodiment of the present invention.
In this embodiment, a plurality of deodorizing towers 1a, 1b, 1c, and 1d having the same structure (four units are shown in the figure) are arranged in parallel with respect to the flow direction of the gas to be treated 10. 26 is a header to which the water pipe 20 and the drain pipe 21 are connected, and the header 26 and each deodorizing tower 1a
~1d is connected to the lower part through a valve 28 and a communicating pipe 27. Note that 29 is an inlet duct for the gas to be processed 10, and 30 is an outlet duct for the process gas 10a.

Next, the operation of this embodiment will be explained. The gas to be treated 10 is supplied to each deodorizing tower 1a to 1 through an inlet duct 30.
It flows in parallel from the top of d. The gas then passes through the first packed bed 2a, is reversed at the bottom of each deodorizing tower 1a to 1d, and further passes through the second packed bed 2b, becoming an odorless processing gas 10a and being discharged through the upper discharge duct 30. As the gas 10 to be treated passes through the first packed bed 2a and the second packed bed 2b, malodorous components contained therein are decomposed and removed by the biological deodorizing action of the immobilized microorganisms as described above.

To explain the case of cleaning one deodorizing tower, for example, the first deodorizing tower 1a, the water in the cleaning water tank 19 is pumped through the water pipe 20 by the water pump 22 to the first deodorizing tower 1a.
from the lower part of the deodorizing tower 1a. The water level of the washing water fed into the deodorizing tower 1a gradually rises from the bottom, and when it reaches the lower edge 18a of the partition wall 18, the flow of gas in the deodorizing tower 1a stops. Further, the water level rises until it reaches the upper surfaces of the first packed bed 2a and the second packed bed 2b, and then stops. This allows the first and second
The packed beds 2a, 2b are completely filled with wash water.
Next, the washing water is drawn out through the drain pipe 21 by the drain pump 24. This wash water is returned to the wash water tank 19. After a certain period of time, the water in the wash water tank 19 is sent to the next second deodorizing tower 1b in the same manner as above, and when the first and second packed beds 2a, 2b are completely immersed, the water in the wash water tank 19 is immediately transferred to the wash water tank 19. Pull back to 19. Such operations are repeated in order for the third and fourth deodorizing towers 1c and 1d. In this case, 1
The interval between cleaning from one deodorizing tower to the next is:
For example, the cleaning interval set according to the conditions (concentration, temperature, humidity, flow rate, etc.) of the gas 10 to be treated at the entrance of the deodorizing tower is divided by the number of deodorizing towers.

In this embodiment, when cleaning a certain deodorizing tower, when the cleaning water level reaches the lower edge 18a of the partition wall 18, the flow of gas in that deodorizing tower stops. Deodorization processing is performed in other deodorization towers that are not being cleaned.

[Effects of the Invention] As is clear from the above description, in the present invention, the entire packed bed is immersed in a cleaning liquid and cleaned in a short time, so that the following effects can be obtained.

(1) Since the cleaning water spreads to every corner of the packed bed for complete cleaning, the entire surface of each carrier in the packed bed can be effectively used for microbial reactions, resulting in high and stable removal performance of malodorous components. can be maintained.

(2) By cleaning by adjusting the PH value of the cleaning water in the cleaning water tank, everything in the packed bed can be brought to the optimum PH value.

(3) Cleaning time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a schematic diagram of an embodiment of an apparatus implementing the present invention, Fig. 3 is a configuration diagram of another embodiment, and Fig. 4 is a conventional gas deodorizing apparatus. FIG. 1: deodorizing tower, 2: packed bed, 2a: first packed bed,
2b: second packed layer, 10: gas to be treated, 10a:
Processing gas, 19: Washing water tank.

Claims (1)

[Scope of Claims] 1. A cleaning method for a deodorizing device, which comprises: cleaning a packed bed in which microorganisms are immobilized in a deodorizing tower by immersing the entire packed bed in cleaning water.