JP6378957B2 - Defoamer charging device and defoamer charging method - Google Patents

Description

  The present invention relates to an antifoaming agent charging apparatus and an antifoaming agent charging method that are suitable for defoaming suddenly generated foam in a methane fermentation tank that performs anaerobic treatment.

  Conventionally, in an anaerobic methane fermentation tank for treating organic waste or wastewater, biogas (methane gas) is generated by anaerobic treatment and the gas is effectively used. In this type of methane fermenter, there is usually no permanent installation of defoamer charging equipment. This is because foaming does not occur constantly in the anaerobic treatment.

  However, when organic waste or wastewater containing components that cause foaming is thrown into the methane fermenter, or when some environmental change occurs while the components are present in the methane fermenter, suddenly, In addition, bubbles may be generated and grow in a short time (several hours). In particular, when organic waste or waste water contains a large amount of oils and proteins, highly viscous foams are likely to be generated. This type of foam is difficult to break, and the foam rapidly increases within a short time (several hours), resulting in sudden foaming. If sudden foaming occurs, bubbles may blow out from the methane fermentation tank safety device, and biogas may leak to the outside at the same time. If biogas leaks, it will hinder the effective use of energy, and odors such as hydrogen sulfide will diffuse.

  Therefore, in such a case, an antifoaming agent will be introduced. As a method for that, an antifoaming agent is introduced into a pipe connected to the methane fermentation tank (for example, a raw material introduction pipe) and then introduced. There existed methods, such as pushing an antifoamer into the methane fermentation tank which is high pressure by methane fermentation using a pump.

JP-A-11-262791 Japanese Utility Model Publication No. 61-139705

  However, since the above-described method for introducing the antifoaming agent is performed manually by an operator, the operation is complicated. In addition, when workers regularly patrol the facilities, it is possible to confirm the above sudden foaming and take defoaming measures, but when the number of patrols is low or when workers are gone, etc. It was difficult to cope with sudden foaming.

  The present invention has been made in view of the above points, and the purpose of the present invention is when a sudden bubble is generated in a methane fermentation tank that performs anaerobic treatment by introducing various organic wastes and wastewater. An object of the present invention is to provide an antifoaming agent charging apparatus and an antifoaming agent charging method capable of detecting foaming and quickly defoaming.

The present invention provides an antifoaming agent storage tank for storing an antifoaming agent to be input to a methane fermentation tank for performing anaerobic treatment, a pressure sensor for detecting an atmospheric pressure in the methane fermentation tank, and a measurement value by the pressure sensor is predetermined. When the value exceeds, a charging means for charging the defoaming agent in the defoaming agent storage tank into the methane fermentation tank, and the charging means, the measured value by the pressure sensor exceeds a predetermined value, When the biogas in the gas holder for temporarily storing the biogas generated in the methane fermentation tank and derived to the outside does not reach a predetermined amount, the antifoaming agent in the antifoam storage tank is added to the methane fermentation tank. It is characterized by being thrown in.
Since it is a water tank that performs anaerobic treatment, if gas bubbles suddenly, the gas discharge port is blocked by bubbles, so that biogas is not discharged and the pressure in the water tank rises. In the present invention, attention is paid to this pressure increase, and this pressure increase is detected as sudden foaming. By comprising in this way, sudden foaming can be detected easily and the foam | bubble which generate | occur | produces suddenly can be reliably defoamed reliably. According to this antifoaming agent charging device, it is possible to input the antifoaming agent even if sudden bubbles occur when the number of patrols of workers is small or at night when there are no workers.
The cause of the increase in atmospheric pressure in the methane fermenter includes, in addition to the above sudden foaming, for example, a failure of the biogas equipment connected to the downstream side of the gas holder, or surplus gas that could not be used in the biogas equipment There is a failure of the surplus gas combustion device that burns. In such a case, the biogas in the gas holder becomes a predetermined amount or more (for example, full). Therefore, in the present invention, when the biogas in the gas holder reaches a predetermined amount, it is determined that there is no sudden foaming, and the antifoaming agent can be reliably introduced only at the time of sudden foaming.

The present invention, example a pressure detecting step of detecting a pressure of the methane fermentation tank which performs anaerobic treatment, pressure of the methane fermentation tank is a predetermined value, greater led to the outside is generated further in the methane fermentation tank An antifoaming agent charging step of introducing an antifoaming agent into the methane fermentation tank when the biogas in the gas holder for temporarily storing the biogas does not reach a predetermined amount. It is characterized by defoaming bubbles generated in the tank .
According to the present invention, the antifoaming agent can be reliably introduced only at the time of sudden foaming.

  According to the present invention, even when sudden bubbles are generated in a methane fermentation tank that performs anaerobic treatment by introducing a wide variety of organic waste and wastewater, the foaming is detected and promptly removed. It can be carried out.

It is a schematic block diagram of the methane fermentation equipment 100 containing the antifoamer injection device 1. FIG. It is an expansion schematic block diagram of the antifoamer injection device. It is an operation process flow figure of antifoamer injection device 1. It is an expansion schematic block diagram of the defoamer injection apparatus 1-2. It is an expansion schematic block diagram of the antifoamer injection device 1-3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a methane fermentation facility 100 including an antifoaming agent input device 1 according to an embodiment of the present invention. This methane fermentation facility 100 is used for a part of the facility that collects biogas by methane fermentation of organic waste such as food waste, and also produces compost. As shown in the figure, a methane fermentation facility 100 includes a methane fermentation tank 101 that stores a liquid to be processed such as organic waste and waste water, a supply pump 103 that supplies the liquid to be processed to the methane fermentation tank 101, The agitating mechanism 105 for agitating the liquid to be treated in the methane fermentation tank 101, the antifoaming agent introduction apparatus 1 for injecting the antifoaming agent into the liquid to be treated in the methane fermentation tank 101, and the methane fermentation tank 101 were processed. A drainage pump 107 for draining a subsequent processing liquid (digestion liquid), a gas holder 109 for deriving and temporarily storing biogas generated in the methane fermentation tank 101, and bio using the biogas stored in the gas holder 109 The gas generator 111, the biogas boiler 113, and the like, and the surplus gas combustion device 115 that burns surplus biogas are provided.

  The methane fermentation tank 101 performs anaerobic treatment with an anaerobic microorganism on the stored liquid to be treated, and causes methane fermentation to be processed. The stirring mechanism 105 is configured to rotationally drive a stirring blade 105a and a stirring rod 105b attached to the stirring blade 105a by a motor 105c. The liquid to be treated is fermented in the methane fermentation tank 101 at, for example, 37 ° C. for 20 days.

  The gas holder 109 is a device that temporarily stores biogas generated in the methane fermentation tank 101 and led to the outside. The gas holder 109 is provided with a pressure gauge for measuring the internal atmospheric pressure, a capacity level gauge for detecting the internal biogas capacity, and the like. The biogas generator 111 is a device that generates power using biogas as an energy source. The biogas boiler 113 is a device that obtains hot water or steam using biogas as an energy source. In addition, facilities using biogas, such as the biogas generator 111 and the biogas boiler 113, are referred to as biogas facilities. The surplus gas combustion device 115 burns biogas safely when biogas cannot be supplied to the biogas facility due to emergency or maintenance, or when the amount of biogas used in the biogas facility is small. To be released. The surplus gas combustion device 115 starts to operate when, for example, the gas pressure (or gas capacity) in the gas holder 109 is equal to or higher than a predetermined set value, and the gas pressure (or gas capacity) in the gas holder 109 is predetermined. When it becomes less than the set value, it is configured to cut off the biogas and extinguish / stop.

  FIG. 2 is an enlarged schematic configuration diagram of the antifoaming agent charging apparatus 1. As shown in the figure, the defoamer charging apparatus 1 includes an antifoaming agent storage tank 10 for storing an antifoaming agent to be input to the methane fermentation tank 101, a pressure sensor 30 for detecting the atmospheric pressure in the methane fermentation tank 101, When the measured value by the pressure sensor 30 exceeds a predetermined value, it comprises an input means 50 for supplying the antifoaming agent in the antifoaming agent storage tank 10 to the methane fermentation tank 101.

  Here, the charging means 50 includes an antifoaming agent introduction pipe 51 that guides the antifoaming agent from the antifoaming agent storage tank 10 to the methane fermentation tank 101, an atmospheric pressure in the methane fermentation tank 101, and an antifoaming agent storage tank 10. A uniform pipe 53 for making the air pressure uniform, an automatic valve 55 and a main valve 57 attached in series in the antifoaming agent introduction pipe 51, a bypass valve 59 attached in parallel to the automatic valve 55, and attached in the uniform pipe 53. A switching valve 61, an air vent valve 63 attached to a pipe connected to the upper part of the uniform pipe 53, and a water spray nozzle 65 attached to a tip portion of the defoamer inlet pipe 51 that enters the methane fermentation tank 101. , And a control unit 67 for performing opening / closing control of the automatic valve 55. In addition, a sensor main valve 33 is attached in the middle of the pressure detection pipe 31 that connects the pressure sensor 30 to the methane fermentation tank 101.

  The antifoaming agent storage tank 10 is configured by attaching a lid 13 to the upper part of the container 11, and is installed on the upper part of the methane fermentation tank 101. The antifoam storage tank 10 is provided with a level gauge capable of confirming the liquid level height (remaining state) of the internal antifoam from the outside. In addition to what is used as a so-called antifoaming agent, the antifoaming agent may be composed of various other materials such as an aggregating agent and fats and oils as long as the foam is eliminated. In this example, a self-emulsifying type antifoaming agent is used.

  The pressure sensor 30 is, for example, a differential pressure type pressure gauge, and measures the atmospheric pressure in the methane fermentation tank 101 via the pressure detection pipe 31 and outputs the measured value as a digital signal (detection signal). The detection signal of the pressure sensor 30 is sent to the control unit 67 and used for opening / closing control of the automatic valve 55. The reason why the pressure sensor 30 is used as a means for detecting foaming is that maintenance is difficult because the electrode type level meter cannot be easily removed, and on the other hand, foaming can be detected as an abnormal pressure.

  The defoamer charging pipe 51 is a pipe that connects the lower part of the defoamer storage tank 10 and the upper part of the methane fermentation tank 101, and is installed in a straight line and substantially vertically. Can be transported in large quantities at once without resistance. Note that the antifoaming agent introducing pipe 51 is not necessarily installed in a straight line and substantially vertically, and a bent pipe or the like may be used. The uniform pipe 53 is a pipe that connects the upper part (gas phase part) of the antifoaming agent storage tank 10 and the upper part (gas phase part) of the methane fermentation tank 101, and makes the pressure in both gas phase parts uniform. It is.

  The automatic valve 55 is an open / close valve that opens and closes the valve by various methods other than manual operation, such as an electric type, a hydraulic type, and an air drive type. In this example, an electromagnetic valve is used. The automatic valve 55 is set to open when the control unit 67 detects that the measured value by the pressure sensor 30 exceeds a predetermined value. On the other hand, the main valve 57, the bypass valve 59, the switching valve 61, the air vent valve 63, and the sensor main valve 33 are all manual valves (for example, ball valves) in this example.

  The sprinkling nozzle 65 uses a perforated tube, a dispersion plate, or the like, and allows the defoaming agent to be defoamed by spraying a defoaming agent over a wide range (or a portion to be concentrated). The control unit 67 performs electrical control such as sequence control and microcomputer control. The pressure detection signal from the pressure sensor 30 and the pressure detection signal (or capacity) from the pressure gauge (or capacity level meter) of the gas holder 109. Detection signal or the like) is input to control opening / closing of the automatic valve 55.

  Next, operation | movement of the methane fermentation installation 100 whole is demonstrated. The liquid to be treated obtained by crushing and sorting organic waste such as food waste is put into the methane fermentation tank 101 by the supply pump 103. The inputted liquid to be treated is fermented at a predetermined temperature while being stirred by the stirring mechanism 105 in the methane fermentation tank 101, and biogas is generated, and at the same time, a methane fermentation digestive liquid is generated. The generated biogas is sent to and stored in the gas holder 109 and used in various biogas facilities such as the biogas generator 111 and the biogas boiler 113 as necessary. When the biogas becomes surplus, it is burned in the surplus gas combustion device 115 and released to the atmosphere. On the other hand, the digestive juice is sent to the subsequent equipment by the drainage pump 107 to generate compost, and the liquid is discharged into the sewer after performing water treatment.

  By the way, when the liquid to be treated is fermented in the methane fermentation tank 101, if the component to be foamed is contained in the liquid to be treated, as described above, suddenly and for a short time (several hours). Bubbles may develop and grow. The defoamer charging device 1 is used to defoam this sudden bubble. Hereinafter, operation | movement of the antifoamer injection device 1 is demonstrated.

  First, referring to FIG. 2, the preparation procedure for use of the defoamer charging device 1 will be described. It is confirmed that the air vent valve 63 and the bypass valve 59 that are normally closed are closed. Further, it is confirmed that the sensor main valve 33 that is normally open is opened. Then, the switching valve 61 and the main valve 57 are closed, and the automatic valve 55 is manually closed. Next, the lid 13 of the antifoaming agent storage tank 10 is opened, a predetermined amount of the antifoaming agent is put into the container 11, and then the lid 13 is closed. Next, the automatic valve 55 is switched to automatic to be in an operating state, and it is confirmed that the power source of the pressure sensor 30 is turned on. Check the set time (time to continue opening the automatic valve 55). And if the main valve 57 and the switching valve 61 are opened, the preparation for use of the antifoamer charging device 1 is completed. In addition, by opening the switching valve 61, the pressure of the gas phase part of the methane fermentation tank 101 and the pressure of the gas phase part of the defoaming agent storage tank 10 are made uniform.

  Next, the operation process of the defoamer charging device 1 will be described. FIG. 3 is an operation process flow chart of the antifoaming agent charging apparatus 1. When a sudden bubble is generated after the operation of the methane fermentation facility 100 is started, the bubble closes the opening of a pipe connecting the methane fermentation tank 101 and the gas holder 109, for example, and the pressure of the gas phase portion in the methane fermentation tank 101 Rises rapidly. On the other hand, the pressure sensor 30 constantly measures the atmospheric pressure in the methane fermentation tank 101 (atmospheric pressure detection step). If the measured pressure value (measured value) of the pressure sensor 30 input to the control unit 67 exceeds a preset pressure value (predetermined value) (step 1), it is stored in the gas holder 109 next. It is detected by a pressure gauge (or a capacity level meter or the like) of the gas holder 109 whether or not the biogas that has reached a predetermined amount (for example, full) (step 2).

  If the amount of biogas in the gas holder 109 is not greater than a predetermined amount, it is determined that sudden foaming has occurred, and the automatic valve 55 is opened (step 3). Thereby, a large amount of the antifoaming agent in the antifoaming agent storage tank 10 is introduced into the methane fermentation tank 101 in a short time, and is diffused and dispersed by the watering nozzle 65. Then, the foam on which the antifoaming agent has fallen disappears (defoaming agent charging step). In addition, since the to-be-processed liquid in the methane fermentation tank 101 is rotated by the stirring mechanism 105, the surface of the to-be-processed liquid is rotating with respect to the thrown-in defoaming agent, and, thereby, the surface of the to-be-processed liquid Defoaming agent is applied to the whole and defoamed. In the open state of the automatic valve 55, at least the timer set time is continued, and all the antifoaming agent in the antifoaming agent storage tank 10 is put into the methane fermentation tank 101 during this time.

  When a preset timer set time has elapsed (step 4), if the measured pressure value of the pressure sensor 30 is less than or equal to the set pressure value (step 5), it is determined that the bubble has disappeared, and the automatic valve 55 is closed (step 6).

  On the other hand, in steps 4 and 5, even if the timer set time has elapsed (that is, even if all the antifoaming agent in the antifoaming agent storage tank 10 is charged), the measured pressure value of the pressure sensor 30 is equal to or less than the set pressure value If the pressure does not decrease, the anti-foaming agent was not effective, or the pressure in the methane fermentation tank 101 is considered to have increased for another reason, so the control unit 67 outputs an abnormality occurrence signal, For example, abnormality notification is performed on a control panel (not shown) of the methane fermentation facility 100 (step 7). At this time, the automatic valve 55 is left in an open state, and the state is maintained until an inspection or the like is performed.

  In Step 2, when the amount of biogas in the gas holder 109 is a predetermined amount or more, the pressure in the methane fermentation tank 101 is increased due to this (that is, no bubbles are generated). Without opening the automatic valve 55, the control unit 67 outputs a signal indicating the occurrence of an abnormality, and notifies the abnormality, for example, to a control panel (not shown) of the methane fermentation facility 100 (step 8). In addition to the sudden foaming, the cause of the increase in atmospheric pressure in the methane fermentation tank 101 is, for example, a failure of biogas equipment such as the biogas generator 111 and the biogas boiler 113 connected to the downstream side of the gas holder 109, Due to the failure of the surplus gas combustion device 115 that burns surplus gas that could not be used in the biogas facility, the gas holder 109 becomes full due to the disappearance of the biogas usage destination, which increases the pressure in the methane fermentation tank 101. There is a case. Therefore, in such a case, the antifoamer charging apparatus 1 determines that it is not sudden foaming even if the measured pressure in the methane fermentation tank 101 exceeds the set pressure value, and only when sudden foaming occurs. The defoaming agent is surely introduced, and at the same time, it is notified that there is a possibility that a failure or the like has occurred in the biogas facility or the surplus gas combustion device 115.

  The main valve 57 and the sensor main valve 33 of the defoamer charging apparatus 1 are normally open, and the defoamer input pipe 51 and the automatic valve 55 and the pressure sensor 30 are damaged or replaced. This is a safety device for manually closing the pressure detection pipe 31. In addition, the main valve 57 closes the antifoaming agent storage tank 10 when it is desired to separate the antifoaming agent storage tank 10 from the methane fermentation tank 101 in order to check the antifoaming agent storage tank 10. The bypass valve 59 is normally closed, and is manually opened and closed as necessary when the automatic valve 55 fails or is maintained. Further, the air vent valve 63 is normally closed, and is opened as necessary in the event of failure or maintenance (for example, the pressure of the biogas in the methane fermentation tank 101 becomes abnormal due to failure) It is used to increase the pressure and reduce the pressure of biogas when there is no other gas escape location).

  The defoamer charging device 1 described above has a simple structure and is easy to assemble, and does not require expensive parts such as a pump, so that the cost of the device can be reduced. In addition, since the defoaming agent can be introduced with a simple configuration of opening and closing the automatic valve 55, it is difficult to break down and is easy to maintain. For example, even if it operates only once in a few years, it operates reliably, and the electricity bill And maintenance costs can be reduced.

  FIG. 4 is an enlarged schematic configuration diagram of an antifoaming agent charging apparatus 1-2 according to another embodiment of the present invention. In the antifoaming agent charging device 1-2 shown in the figure, the same or corresponding parts as those in the antifoaming agent charging device 1 shown in FIGS. "). Note that matters other than those described below are the same as those in the embodiment shown in FIGS.

  The defoamer charging device 1-2 differs from the antifoaming agent charging device 1 in that a water seal device 30-2 is used as a pressure sensor and a ball tap 55-2 is used as an automatic valve. The ball (floating ball) 55a-2 at the tip of the lever of the ball tap 55-2 is introduced into the water sealing device 30-2 and floats on the water surface, while the valve 55b-2 at the base of the lever is an antifoaming agent. It is attached to the input pipe 51-2 to open and close it. That is, the valve 55b-2 is configured to open and close when the ball 55a-2 moves up and down by the vertical movement of the water surface in the water sealing device 30-2.

  And when the liquid level of the part which the ball | bowl 55a-2 in the water sealing apparatus 30-2 floats by the pressure rise by the biogas in the methane fermenter 101-2, the ball | bowl 55a-2 will rise, When the set water surface that has been set is exceeded (that is, when the measured pressure value by the water seal device 30-2 exceeds a predetermined value), the valve 55b-2 is opened, thereby the antifoaming agent storage tank 10 The antifoaming agent in -2 is introduced into the methane fermentation tank 101-2 in a large amount in a short time, and is diffused and dispersed by the watering nozzle 65-2 to defoam the bubbles. When the pressure in the methane fermentation tank 101-2 is reduced by defoaming, the liquid level of the portion where the ball 55a-2 is floating in the water sealing device 30-2 is lowered, the ball 55a-2 is lowered, and the valve 55b -2 closes.

  In the case of the defoamer charging device 1-2, the condition that the biogas in the gas holder does not reach the predetermined amount is not added to the condition for opening the defoamer charging pipe 51-2. For example, an automatic valve that closes when the biogas in the gas holder reaches a predetermined amount may be separately attached to the antifoaming agent introduction pipe 51-2.

FIG. 5 is an enlarged schematic configuration diagram of an antifoaming agent charging apparatus 1-3 according to still another embodiment of the present invention. In the antifoaming agent charging apparatus 1-3 shown in the figure, the same or equivalent parts as those in the antifoaming agent charging apparatus 1 shown in FIGS. "). Note that matters other than those described below are the same as those in the embodiment shown in FIGS.

  In this defoamer charging apparatus 1-3, the difference from the defoamer charging apparatus 1 is that an antifoam transfer pump 69-3 is installed instead of the automatic valve 55. When the measured pressure value of the pressure sensor 30-3 input to the control unit 67-3 exceeds a preset pressure value, the amount of biogas in the gas holder is the same as in the above embodiment. The defoamer transfer pump 69-3 is driven on the condition that the defoamer does not become a predetermined amount or more. It puts in the methane fermentation tank 101-3, diffuses and sprays with the watering nozzle 65-3, and defoams. In the case of this defoamer charging device 1-3, since the pump 69-3 is used, the installation position of the antifoam storage tank 10-3 is set lower than the installation position of the methane fermentation tank 10-3. Can also be done easily.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the defoaming agent charging apparatus, in order to smoothly introduce the antifoaming agent in the antifoaming agent storage tank into the methane fermentation tank with a simple configuration, the atmospheric pressure in the methane fermentation tank and the antifoaming agent Although the uniform pipe | tube which makes the atmospheric | air pressure in a storage tank uniform is installed, you may abbreviate | omit installation of a uniform pipe | tube depending on the case. In this case, you may attach the compressor etc. which supply compressed air to an antifoamer storage tank, for example.

  In the defoamer charging device, when the measured value by the pressure sensor exceeds a predetermined value and the amount of biogas in the gas holder does not exceed the predetermined amount, the defoamer in the defoamer storage tank is used. However, in some cases, this may be omitted under the condition that the amount of biogas in the gas holder does not exceed a predetermined amount. Therefore, in this case, for example, the automatic valve is opened only on the condition that the measured value by the pressure sensor exceeds a predetermined value, and the antifoaming agent in the antifoaming agent storage tank is put into the methane fermentation tank. In this case, a separate opening / closing valve may be provided in the antifoaming agent introduction pipe, and the opening / closing valve may be closed when the amount of biogas in the gas holder exceeds a predetermined amount.

  In each of the above embodiments, the present invention is used as a bioplant that produces biogas and compost by fermenting biogas from organic waste such as food waste. It can be similarly applied to a methane fermenter used for this purpose. In short, the present invention can be applied to any application as long as it is an antifoaming agent input device that inputs an antifoaming agent into a methane fermentation tank that performs anaerobic treatment.

DESCRIPTION OF SYMBOLS 1 Defoamer injection apparatus 10 Antifoam storage tank 11 Container 13 Lid 30 Pressure sensor 31 Pressure detection piping 33 Sensor original valve 50 Input means 51 Antifoam agent injection pipe (input means)
53 Uniform tube (loading means)
55 Automatic valve (loading means)
57 Main valve (loading means)
59 Bypass valve (loading means)
61 Switching valve (loading means)
63 Air vent valve (loading means)
65 Watering nozzle (loading means)
67 Control unit (feeding means)
DESCRIPTION OF SYMBOLS 100 Methane fermentation equipment 101 Methane fermentation tank 103 Supply pump 105 Stirring mechanism 105a Stirring blade 105b Stirring rod 105c Motor 107 Drain pump 109 Gas holder 111 Biogas generator (biogas facility)
113 Biogas boiler (biogas equipment)
115 Excess gas combustion device 1-2 Defoamer charging device 30-2 Water seal device (pressure sensor)
55-2 Automatic valve (ball tap, input means)
55a-2 ball (floating ball)
55b-2 Valve 1-3 Defoamer input device 69-3 Antifoam transfer pump (input means)

Claims (2)

An antifoaming agent storage tank for storing an antifoaming agent to be put into a methane fermentation tank for anaerobic treatment;
A pressure sensor for detecting the atmospheric pressure in the methane fermentation tank;
When the measured value by the pressure sensor exceeds a predetermined value, it comprises a charging means for charging the defoaming agent in the defoaming agent storage tank into the methane fermentation tank,
In the case where the measured value by the pressure sensor exceeds a predetermined value, and the biogas in the gas holder for temporarily storing the biogas generated in the methane fermentation tank and derived outside is not reached a predetermined amount The defoamer charging device is characterized in that the defoamer in the defoamer storage tank is charged into the methane fermentation tank. An atmospheric pressure detection step for detecting the atmospheric pressure in the methane fermentation tank for anaerobic treatment;
When the atmospheric pressure in the methane fermentation tank exceeds a predetermined value, and the biogas in the gas holder that temporarily stores the biogas generated in the methane fermentation tank and derived to the outside does not reach a predetermined amount, the methane fermentation And a defoamer charging step of charging the defoamer into the tank to defoam the bubbles generated in the methane fermentation tank.

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