JP2009190006A - Organism desulfurization apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save trouble cleaning of a packed bed of an organism desulfurization apparatus and improve its cleaning effect. <P>SOLUTION: The organism desulfurization apparatus includes an organism desulfurization column 1 having an openable lid 2 or the like, an upper packed bed 3 and a lower packed bed 4 which are installed at the upper part and the lower part in the organism desulfurization column respectively and are each composed of a carrier and a supporting plate to support the carrier, an upper aeration device 7 and a lower aeration device 8 which are installed below the upper packed bed and the lower packed bed respectively and a drain pipe 12 with a drain valve 11 which is connected to the lower part of the organism desulfurization column. Firstly, after the lid or the like is opened with the drain valve 11 closed and water is filled up to above the upper packed bed 3, the upper packed bed 3 is cleaned by aeration with the upper aeration device 7. Secondly, after the aeration with the upper aeration device 7 is stopped and the water level is lowered to between the upper packed bed 3 and the lower packed bed 4 by opening the drain valve 11, the lower packed bed 4 is cleaned by aeration with the lower aeration device 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a biological desulfurization apparatus, and more particularly to a biological desulfurization apparatus that processes biogas generated in anaerobic digestion of organic wastewater such as sewage and industrial wastewater.

  As is well known, a methane fermentation treatment method has been widely applied as a treatment method for organic waste such as sewage sludge and garbage and organic wastewater such as food factory wastewater. In the methane fermentation treatment method, organic wastewater is introduced into a biological reaction tank, organic matter is decomposed by the methane fermentation bacteria group filled in the reaction tank, biogas containing methane gas as a main component is generated, and organic matter in the wastewater is also generated. Is a treatment method for decomposing and removing. However, when the sulfur component such as protein is contained in the waste water, the sulfur component is reduced by the action of the sulfate reducing bacteria, and hydrogen sulfide gas is contained in the biogas.

  By the way, when methane gas contained in biogas is used as a fuel such as a boiler, it is necessary to remove hydrogen sulfide gas contained in biogas. This is because when the biogas is burned, the hydrogen sulfide gas in the biogas is oxidized to produce sulfur oxide, which may corrode the equipment.

  As a method for removing hydrogen sulfide gas contained in biogas, there are a dry desulfurization method in which adsorption is performed using an adsorbent mainly composed of iron oxide, or a wet desulfurization method in which it is absorbed and removed in an aqueous solution using alkali or the like. It's being used. However, these methods are systems in which running costs increase because chemicals such as an adsorbent are required for adsorption and the adsorbent after adsorption becomes waste.

Therefore, as a system for performing desulfurization at a low running cost, a technique (Patent Document 1) for removing hydrogen sulfide in biogas by filling a reaction tank with a carrier attached with microorganisms that oxidize and decompose hydrogen sulfide has been proposed. .
In this desulfurization technique, it has been pointed out that the packed bed is likely to be clogged by the microorganisms grown on the packed bed and the supporting part of the packed bed or by simple sulfur produced by oxidizing the removed hydrogen sulfide. As a means for solving this, a method of flowing a biogas in a downward flow, using a carrier lighter than water, spreading water above the height of the packed bed, blowing air from the lower part, causing the carrier to flow in water and washing (Patent Document 2) has been proposed.
JP-A-2-26615 Japanese Patent No. 3750648

  Washing of the packed bed is performed in order to peel off elemental sulfur from the packed bed, but microorganisms grown on the carrier are also peeled off by washing. That is, when the washing is performed for a long time, the clogging of the packed bed with single sulfur is improved, but the microorganisms are almost peeled off, and the hydrogen sulfide removal performance of the biological desulfurization apparatus is greatly reduced. Therefore, the cleaning must be performed to such an extent that the hydrogen sulfide removal performance can be maintained.

  And it becomes a problem especially when the packed bed has two stages. This is because in the case of a biodesulfurization apparatus having a two-stage packed bed, the amount of elemental sulfur produced in the upper and lower packed beds is different, and the lower packed bed close to the inflow side where the hydrogen sulfide concentration in biogas is high. This is because a large amount of elemental sulfur is produced in the process. According to the experiments by the inventors, the amount of elemental sulfur adhering to the packed bed after one month of operation of the biodesulfurization apparatus having a two-stage packed bed is 4 to 5 times that of the upper packed bed in the lower packed bed. It was. In this case, if the same washing is performed on the two-stage packed bed, there is a risk that the lower-stage single sulfur will not be sufficiently separated or the necessary amount of the upper-stage microorganisms will not be maintained.

  Also, when the packed bed is composed of a carrier and a support plate that supports the carrier, carrier sulfur adheres to the support plate and becomes a clogging factor, but in washing, the carrier flows in water, but the support plate Since it is fixed, it may be weakened by just soaking it in water.

  The present invention has been made in consideration of such circumstances, and in a biological desulfurization apparatus having two packed beds, a biological desulfurization apparatus that can perform cleaning of the packed bed with less labor and can enhance the cleaning effect is provided. The purpose is to do.

The biological desulfurization apparatus of the present invention is as follows.
(1) A biodesulfurization tower having a lid or a valve that can be opened and closed at the top, and an upper packed bed and a lower packed bed that are respectively arranged above and below the biodesulfurization tower and are composed of a support and a support plate that supports the support. An upper air diffuser and a lower air diffuser disposed below the upper packed bed and the lower packed bed, respectively, and a treated water pipe connected to the lower part of the biological desulfurization tower via a drain valve, A biological desulfurization apparatus comprising: opening the lid or valve; closing the drain valve; and filling the upper stage packed bed with water to supply air to the upper stage air diffuser for aeration. In this state, the upper packed bed is washed, and then the upper diffuser is stopped, the drain valve is opened, and the water level is lowered below the upper packed bed and above the lower packed bed. , Supply air to the lower diffuser Biological desulfurization apparatus, characterized in that the arrangement for cleaning of the lower filling layer by performing aeration Te (the first invention).

  (2) a biological desulfurization tower provided with a lid or valve that can be opened and closed at the top, and an upper packed bed and a lower packed bed that are respectively arranged above and below the biological desulfurized tower and are composed of a carrier and a support plate that supports the carrier; An upper air diffuser and a lower air diffuser disposed below the upper packed bed and the lower packed bed, respectively, and a treated water pipe connected to the lower part of the biological desulfurization tower via a drain valve, A biological desulfurization apparatus comprising: opening the lid or valve; closing the drain valve; filling with water until the support plate of the upper packed bed or the lower packed bed is immersed; an upper diffuser or a lower diffuser A biological desulfurization apparatus (second invention), characterized in that the aeration plate is used to wash the support plate of the upper packed bed or the lower packed bed.

  (3) a biological desulfurization tower, an upper packed bed and a lower packed bed disposed above and below the biological desulfurization tower, a shower nozzle for spraying water disposed at an upper portion in the biological desulfurization tower, A circulation device for spraying a part of the bottom retained water that drops and stays to the bottom of the biological desulfurization tower via the packed bed and the lower packed bed is connected to the lower part of the biological desulfurization tower. , A biological desulfurization apparatus having a treated water pipe interposing a drain valve, and when microorganisms in the upper packed bed are excessively separated by washing, circulation of bottom accumulated water by the circulation apparatus and by the shower nozzle A biodesulfurization apparatus (third invention) characterized in that the amount of microorganisms in the upper packed bed is recovered by using water spraying together.

  (4) a biodesulfurization tower having a lid or a valve that can be opened and closed at the top, and an upper packed bed and a lower packed bed that are respectively arranged above and below the biodesulfurization tower and are composed of a support and a support plate that supports the support; , A high-pressure washing apparatus having a high-pressure washing nozzle, which is arranged below each of the upper packed bed and the lower packed bed, and a treated water pipe connected to the lower part of the biological desulfurization tower, with a drain valve A biological desulfurization apparatus comprising: a structure for cleaning the upper packed bed and the lower packed bed by supplying water to a high pressure cleaning nozzle of the high pressure cleaning apparatus ( Fourth invention).

  According to the present invention, it is possible to provide a biodesulfurization apparatus that can clean the packed bed with less labor and can enhance the cleaning effect. Further, by taking measures such as appropriately setting the frequency of cleaning the upper packed bed and the lower packed bed, the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time. Furthermore, by disposing a circulation device that circulates the bottom accumulated water in the biological desulfurization tower, it is possible to recover the decrease in hydrogen sulfide removal performance in a short time. Furthermore, the cleaning operation can be facilitated by taking measures to easily determine the water level in the biological desulfurization tower, and the cleaning time can be shortened by installing high-pressure cleaning devices in the upper packed bed and the lower packed bed, respectively. .

Hereinafter, the biological desulfurization apparatus according to the present invention will be described in more detail.
In the invention of the above (1), the means for cleaning the upper packed bed and the lower packed bed, the lid or valve is opened, the drain valve is closed, and the lower packed bed is filled with water up to above the lower packed bed. The lower packed bed is cleaned by aeration using an air diffuser, and the lower packed bed cleaning means is used, and the frequency of cleaning only the lower packed bed is performed at an interval shorter than the frequency of cleaning the upper packed bed. A configuration is preferred.

  The reason for such a configuration is as follows. That is, hydrogen sulfide changes into sulfuric acid or elemental sulfur by the desulfurization reaction. Sulfuric acid is discharged together with the waste water, but the elemental sulfur adheres to the carrier and becomes a clogging factor for the upper packed bed and the lower packed bed. However, the research results so far show that the formation of elemental sulfur is greater in the lower packed bed. Therefore, if the lower packed bed is washed more frequently than the upper packed bed, the upper packed bed Unnecessary detachment of microorganisms can be prevented and clogging of the lower packed bed can be suppressed. Therefore, the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time.

  In the invention of (1), the upper stage diffuser and the lower stage diffuser include a diffuser pipe having a plurality of air discharge ports, and the diffuser pipe supports the upper packed bed and the lower packed bed. It is preferable that it is the structure which is arrange | positioned along the angle of a support plate, and is formed so that the discharge port of a diffuser may face the other side of an angle. By adopting such a configuration, the diffuser tube is less likely to obstruct the flow path of water or gas. In addition, by forming the discharge port of the air diffuser on the lower side, carrier deposits that have fallen from the upper packed bed (or the lower packed bed) are prevented from entering the discharge port and clogging the diffuser. The cleaning effect can be stably maintained. Therefore, the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time.

  Furthermore, in the above inventions (1) to (3), it is preferable that the water level when the inside of the biological desulfurization tower is filled with water is determined by the temperature of the outer surface of the biological desulfurization tower. That is, in the biodesulfurization tower, the temperature of the outer surface of the biodesulfurization tower in the part filled with water is close to the water temperature, and the outer surface of the biodesulfurization tower in the part not filled with water is close to room temperature. I can judge. Therefore, with the above configuration, the water level in the biological desulfurization tower can be easily determined, so that the cleaning operation can be performed more easily.

Next, a specific example of the biological desulfurization apparatus according to the embodiment of the present invention will be described with reference to the drawings. Note that the present embodiment is not limited to the following description.
(Example 1): Corresponding to claims 1 and 2
Please refer to FIG. Reference numeral 1 in the figure is a biological desulfurization tower having a lid 2 that can be opened and closed at the top. An upper packed bed 3 and a lower packed bed 4 are arranged above and below the biodesulfurization tower 1, respectively. The upper packed bed 3 includes an upper carrier 5a and a support plate 6 that supports the upper carrier 5a, and the lower packed bed 4 includes a lower carrier 5b and a support plate 6 that supports the lower carrier 5b.

  Below the upper packed bed 3 and the lower packed bed 4, an upper diffuser 7 and a lower diffuser 8 are disposed, respectively. In the biological desulfurization tower 1, a shower nozzle 9 is arranged on the upper side of the upper packed bed 3, and water is injected from the shower nozzle 9 by a pump 10. A treated water pipe 12 having a drain valve 11 interposed is connected to the lower part of the biological desulfurization tower 1. Air is supplied to the upper air diffuser 7 and the lower air diffuser 8 through the valves 14a, 14b, and 14c by the blower 13.

  Connected to the bottom of the biological desulfurization tower 1 is a biogas inflow pipe 20 having a valve 14 e for introducing biogas into the biological desulfurization tower 1. In the middle of the biogas inflow pipe 20, a pipe 18 having a valve 14 f is connected, and air necessary for oxidative decomposition of hydrogen sulfide in the biogas is sent to the biogas inflow pipe 20 by the compressor 19. ing. Connected to the upper part of the biological desulfurization tower 1 is a pipe 15 provided with a valve 14 d for discharging the processing gas in the biological desulfurization tower 1. The inlet side of the biogas inflow pipe 20 and the outlet side of the pipe 15 are connected by a bypass pipe 17 having a bypass valve 16 interposed therebetween. At the time of cleaning the biological desulfurization apparatus, the biogas bypasses the biological desulfurization apparatus by closing the valve 14e and the valve 14f, opening the valve 16, and passing through the bypass pipe 17.

  In the biological desulfurization apparatus having such a configuration, the upper stage is opened by supplying air to the upper stage air diffuser 7 in the state where the lid 2 is opened, the drain valve 11 is closed and the upper packed bed 3 is filled with water. The packed bed 3 is cleaned. After that, the upper air diffuser 7 is stopped, the drain valve 11 is opened, and air is supplied to the lower air diffuser 8 with the water level lowered below the upper packed bed 3 and above the lower packed bed 4. Then, the lower packed bed 4 is cleaned by aeration. In addition, as said water, the secondary treated water of a wastewater treatment facility is utilized, for example.

  More specifically, by closing the drain valve 11 and injecting water into the biological desulfurization tower 1 by the pump 10, the inside of the biological desulfurization tower 1 is filled with water. When aeration with air is performed by the upper air diffuser 7 arranged below the upper packed bed 3, the carrier of the upper packed bed 3 moves due to the buoyancy of the bubbles, and the deposits on the carrier are peeled off. Here, since the air supplied by aeration is discharged from the opening of the biological desulfurization tower 1, the internal pressure of the biological desulfurization tower 1 does not increase.

In addition, when the upper packing layer 3 is cleaned, the peeled carrier deposits are deposited on the lower packing layer 4, so that the cleaning effect is obtained by cleaning the lower cleaning layer 4 after cleaning the upper packing layer 3. Will increase. Furthermore, the time required for the cleaning operation is shortened with less time for opening and closing the valve.
Thus, according to the biological desulfurization apparatus which concerns on Example 1, cleaning of the upper stage packed bed 3 and the lower stage packed bed 4 of a biological desulfurization apparatus can be performed with the least effort, and the cleaning effect can be heightened.

  In Example 1, the frequency of cleaning the upper packing layer 3 and the lower packing layer 4 was not mentioned. However, for example, a new effect can be obtained by cleaning under the following conditions. That is, in the biological desulfurization apparatus of FIG. 1, after the lid 2 is opened and the drain valve 11 is closed, aeration is performed by the lower air diffuser 8 in a state filled with water from the shower nozzle 9 to above the lower packed bed 4. In this way, only the lower packed bed 4 is cleaned, and the cleaning frequency of the lower packed bed 4 is performed at an interval shorter than the cleaning frequency of the upper packed bed 3, thereby improving the hydrogen sulfide removal performance of the biological desulfurization apparatus for a long time. Highly stable over time.

  This effect is obtained for the following reason. That is, hydrogen sulfide changes into sulfuric acid or elemental sulfur by the desulfurization reaction. The sulfuric acid is discharged together with the waste water, but the elemental sulfur adheres to the carrier and becomes a blocking factor for the upper packed bed 3 and the lower packed bed 4. From the research results so far, it is known that the formation of elemental sulfur is more in the lower packed bed 4, so that the lower packed bed 4 is cleaned more frequently than the upper packed bed 3 as described above. Thus, unnecessary detachment of microorganisms from the upper packed bed 3 can be prevented, and blockage of the lower packed bed 4 can be suppressed.

  According to the experiments by the inventors, the lower packed bed 4 is cleaned once every 10 days or once every week, and the upper packed bed 3 is also cleaned once a month. It was suitable to stabilize the hydrogen sulfide removal performance of biological desulfurization equipment. Considering that the amount of simple sulfur adhering to the lower packed bed 4 is 4 to 5 times that of the upper packed bed 3, it is determined that the frequency was appropriate depending on the amount of generated single sulfur. Further, in the cleaning, the time for supplying air and performing aeration is excessive when it exceeds 1 minute, and when the time is 1 minute 30 seconds, the hydrogen sulfide removing performance is lowered. A time of 30 seconds was sufficient. That is, it was considered that a slight movement of the carrier was sufficient to peel off the elemental sulfur from the packed bed. It goes without saying that the cleaning conditions for the lower packed bed 4 and the upper packed bed 3 are not limited to the frequency and time described above.

(Example 2): Corresponding to claim 3
Reference is made to FIGS. 2A, 2B, and 2C. Here, FIG. 2 (A) is a schematic plan view of a support plate for the upper packed bed, which is one configuration of the biological desulfurization apparatus, and FIG. 2 (B) is an upper diffuser disposed below the upper packed bed. 2 is a schematic plan view showing the relationship between a pipe, a valve, and a blower, which is one configuration, and FIG. 2 (C) is a back view partially enlarged of the air diffuser of FIG. 2 (B). However, the same members as those in FIG. Moreover, since the lower packed bed has the same configuration as the upper packed bed, the description thereof is omitted.

  The support plate 6 is composed of angles 21 that are arranged substantially evenly in the vertical and horizontal directions, and a punching metal 22 that is arranged on top of these angles 21. In the lower part of the support plate 6, a plurality of air diffusers 23 constituting the upper air diffuser 7 are arranged along an angle 21 along one direction (the vertical direction in FIG. 2A). An air discharge port 23 a is formed in the air diffuser 23 so as to face the direction opposite to the angle 21. Each diffuser pipe 23 is connected to a pipe 25 having a valve 24 interposed therebetween. These pipes 25 are connected to the blower 13 by a pipe 27 having a valve 26 interposed therebetween.

  According to the second embodiment, the configuration in which the air diffuser 23 is disposed along the angle 21 of the support plate 6 makes it less likely that the air diffuser 23 obstructs the flow path of water or gas. Further, by forming the discharge port 23a of the diffuser tube 23 to be on the lower side, the carrier deposits that have fallen from the upper packed bed 3 (or the lower packed bed 4) enter from the discharge port 23a and the diffused tube 23 is formed. Clogging can be avoided and the cleaning effect can be maintained stably. Therefore, the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time.

(Example 3): Corresponding to claim 4
Please refer to FIG. In the third embodiment, the lid 2 is opened, the drain valve 11 is closed, and the upper stage packed bed 3 (or the lower stage packed bed 4) is filled with water until the support plate 6 is immersed, and the upper stage diffuser 7 (or the lower stage is installed). The support plate 6 of the upper packed bed 3 (or the lower packed bed 4) is cleaned by aeration with the diffuser 8).

  According to Example 3, the support plate 6 can be cleaned by filling the water until the support plate 6 of the upper packed bed 3 (or the lower packed bed 4) is immersed. In addition, since almost all of the carrier is not immersed in water, deposits on the carrier are very rarely peeled off by water. Accordingly, since only the support plate 6 can be washed for a long time, the support plate 6 can be prevented from being blocked by the product, and the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time.

(Example 4): Corresponding to claim 5
Please refer to FIG. However, the same members as those in FIG.
The reference numeral 31 in the figure is a part of the bottom accumulated water 32 that drops and stays at the bottom of the biological desulfurization tower 1 via the upper packed bed 3 and the lower packed bed 4 from the upper part of the upper packed bed 3. It is a circulation device. The circulation device 31 includes a pipe 33 connected to the upper and lower parts of the biological desulfurization tower 1, a valve 34 interposed in the pipe 33, a circulating water tank 35 and a circulation pump 36, and a liquid spray pipe connected to the pipe 33. 37.
In the biological desulfurization apparatus having such a configuration, when microorganisms in the upper packed bed 3 are excessively separated by washing, upper stage filling is performed by using both circulation of the bottom accumulated water 32 by the circulation apparatus 31 and water spraying by the shower nozzle 9. The layer 3 is configured to recover the amount of microorganisms.

  In the biological desulfurization apparatus of FIG. 4, the microorganisms detached from the upper packed bed 3 fall into the lower packed bed 4, so that the lower packed bed 4 is supplied with microorganisms from the upper packed bed 3. On the other hand, since the microorganisms are not supplied from anywhere in the upper packed bed 3, it takes more time than the lower packed bed 4 until the microorganisms grow. Thus, in Example 4, when the microorganisms in the upper packed bed 3 are excessively separated by washing, the upper packed bed is obtained by using both the circulation of the bottom accumulated water 32 by the circulation device 31 and the spraying of the water by the shower nozzle 9. 3 is recovered so that the microorganisms separated from the lower packed bed 4 can be supplied to the upper packed bed 3 by spraying the bottom stagnant water 32 on the upper packed bed 3 by the circulation device 31, and the upper packed The amount of microorganisms in the layer 3 can be increased in a short time. Accordingly, it is possible to recover in a short time the deterioration of the hydrogen sulfide removal performance of the biological desulfurization apparatus due to the detachment of microorganisms from the carrier due to overwashing.

  In addition, when using together circulation of the bottom part retention water 32 by the circulation apparatus 31, and spraying of the water by the shower nozzle 9, it is desirable to reduce the amount of spraying of water. This is to prevent the amount of the liquid passing through the upper packed bed 3 and the lower packed bed 4 from becoming excessive and increase the amount of microorganisms to be peeled off. At least the amount of the bottom retained water 32 to be circulated should be subtracted. .

(Example 5): Corresponding to Claim 6
Reference is made to FIGS. Here, FIG. 4 (A) is a schematic explanatory diagram of the biological desulfurization apparatus of Example 5, and FIG. 4 (B) shows the tower height of the water level and the tower outer surface temperature in the biological desulfurization tower of the biological desulfurization apparatus. It is a characteristic view which shows the relationship. However, the same members as those in FIG. The biodesulfurization apparatus of Example 5 is characterized in that the water level when the biodesulfurization tower 1 is filled with water 38 is determined by the temperature of the outer surface of the biodesulfurization tower 1. Here, a thermometer can be used for temperature measurement, but the water level can be more easily determined by using infrared thermography or the like. In the apparatus having such a configuration, the temperature of the outer surface of the biological desulfurization tower 1 filled with water 38 is close to the water temperature, and the outer surface of the biological desulfurization tower 1 filled with water is close to room temperature (FIG. 4B). reference). Therefore, this boundary line can be determined as the water level. Thus, according to Example 5, since the water level in the biological desulfurization tower 1 can be easily determined, the cleaning operation can be performed more easily.

Example 6: Corresponding to Claim 7
Please refer to FIG. However, the same members as those in FIG.
Reference numeral 41 in the figure denotes a high-pressure cleaning nozzle of the high-pressure cleaning device, which is disposed below the upper packed bed 3 and the lower packed bed 4, respectively. The biological desulfurization apparatus of FIG. 5 is configured to clean the upper packed bed 3 and the lower packed bed 4 by supplying water to the high pressure cleaning nozzle 41 of the high pressure cleaning apparatus.

  According to Example 6, the deposits on the support plate 6 can be peeled off by spraying pressurized water from below the support plate 6 of the upper packed bed 3 and the lower packed bed 4. Further, by moving the carrier by water pressure, it is possible to easily peel off the deposit on the carrier. As a result, it is not necessary to fill the biological desulfurization tower 1 with water, the support plate 6 can be cleaned in a short time, and the stop time of the biological desulfurization apparatus due to the cleaning can be shortened. Thus, according to Example 6, the upper packed bed 3 and the lower packed bed 4 of the biological desulfurization apparatus can be cleaned in a short time, and the hydrogen sulfide removal performance of the biological desulfurization apparatus can be highly stabilized over a long period of time. Can do.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment. Specifically, in the above-described embodiment, the case where an openable / closable lid is provided at the top of the biological desulfurization tower is described. However, the present invention is not limited thereto, and a valve may be provided at the top of the biological desulfurization tower.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the biological desulfurization apparatus which concerns on Example 1 of this invention. Explanatory drawing of the upper stage packed bed etc. which are one structure of the biodesulfurization apparatus of the biodesulfurization apparatus which concerns on Example 2 of this invention. FIG. 6 is a schematic overall view of a biological desulfurization apparatus according to Embodiment 4 of the present invention. Explanatory drawing of the biological desulfurization apparatus which concerns on Example 5 of this invention. Schematic explanatory drawing of the biological desulfurization apparatus which concerns on Example 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Biological reaction tank, 2 ... Upper lid, 3 ... Upper stage packed bed, 4 ... Lower stage packed bed, 5a ... Upper stage carrier, 5b ... Lower stage carrier, 6 ... Support plate, 7 ... Upper stage diffuser, 8 ... Lower stage diffuser Apparatus, 9, 37 ... Shower nozzle, 10 ... Pump, 11 ... Drain valve, 12 ... Treated water piping, 14a-14f, 34 ... Valve, 16 ... Bypass valve, 17 ... Bypass pipe, 19 ... Compressor, 20 ... Biogas Inflow pipe, 21 ... angle, 22 ... punch metal, 23 ... diffuser pipe, 35 ... circulating water tank, 36 ... circulating pump, 38 ... bottom accumulated water, 41 ... high pressure washing nozzle.

Claims (7)

A biological desulfurization tower having a lid or a valve that can be opened and closed at the top; an upper packed bed and a lower packed bed, each of which is arranged above and below the biological desulfurization tower and includes a support and a support plate that supports the support; The upper stage aeration apparatus and the lower stage aeration apparatus respectively disposed on the lower side of the upper stage packed bed and the lower stage packed bed, and a treated water pipe connected to the lower part of the biological desulfurization tower and provided with a drain valve. A biological desulfurization device,
In the state where the lid or valve is opened, the drain valve is closed and the upper filling layer is filled with water, the upper filling layer is cleaned by supplying air to the upper aeration device and performing aeration. Done
Thereafter, the upper air diffuser is stopped, the drain valve is opened, and air is supplied to the lower air diffuser in a state where the water level is lowered below the upper packed bed and above the lower packed bed. A biological desulfurization apparatus characterized in that the lower packed bed is washed by aeration. Means for cleaning the upper packed bed and the lower packed bed according to claim 1;
Opening the lid or valve, closing the drain valve, and cleaning the lower packed bed by aeration with the lower diffuser in a state filled with water above the lower packed bed. Having cleaning means,
A biological desulfurization apparatus characterized in that the frequency of cleaning only the lower packed bed is performed at an interval shorter than the frequency of cleaning the upper packed bed. The upper-stage diffuser and the lower-stage diffuser include a diffuser pipe having a plurality of air discharge ports, and the diffuser pipe is disposed along an angle of a support plate that supports the upper-stage packed bed and the lower-stage packed bed. The biodesulfurization apparatus according to claim 1 or 2, wherein the discharge port of the air diffuser is configured to face the opposite side of the angle. A biological desulfurization tower having a lid or a valve that can be opened and closed at the top; an upper packed bed and a lower packed bed, each of which is arranged above and below the biological desulfurization tower and includes a support and a support plate that supports the support; The upper stage aeration apparatus and the lower stage aeration apparatus respectively disposed on the lower side of the upper stage packed bed and the lower stage packed bed, and a treated water pipe connected to the lower part of the biological desulfurization tower and provided with a drain valve. A biological desulfurization device,
Open the lid or valve, close the drain valve, fill with water until the support plate of the upper packed bed or the lower packed bed is immersed, and perform aeration with the upper diffuser or the lower diffuser to perform the upper packed bed or A biological desulfurization apparatus characterized in that the support plate of the lower packed bed is washed. A biological desulfurization tower, an upper packed bed and a lower packed bed disposed above and below in the biological desulfurized tower, a shower nozzle for spraying water disposed at an upper portion in the biological desulfurized tower, an upper packed bed, and A circulation device for spraying a part of the bottom retained water that drops and stays to the bottom of the biological desulfurization tower via the lower packed bed from the upper part of the upper packed bed, and a drain valve connected to the lower part of the biological desulfurization tower A biological desulfurization apparatus comprising a treated water pipe intervening,
When microorganisms in the upper packed bed are excessively separated by washing, the amount of microorganisms in the upper packed bed is recovered by using both the circulation of the bottom accumulated water by the circulation device and the spraying of water by the shower nozzle. A biological desulfurization apparatus characterized by that. The biodesulfurization tower according to any one of claims 1 to 5, wherein the biodesulfurization tower is configured to determine a water level when the biodesulfurization tower is filled with water based on a temperature of an outer surface of the biodesulfurization tower. A biological desulfurization tower having a lid or a valve that can be opened and closed at the top; an upper packed bed and a lower packed bed, each of which is arranged above and below the biological desulfurization tower and includes a support and a support plate that supports the support; A high-pressure washing apparatus having a high-pressure washing nozzle, which is arranged below the upper packed bed and the lower packed bed, respectively, and a treated water pipe connected to the lower part of the biological desulfurization tower and provided with a drain valve A biological desulfurization device,
A biodesulfurization apparatus characterized in that the upper packed bed and the lower packed bed are cleaned by supplying water to the high pressure cleaning nozzle of the high pressure cleaning apparatus.

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