Anti-odor system, anti-odor device, and anti-odor method

Abstract

Provided is an odor prevention system that can reduce the cost related to odor prevention and reliably determine whether odor is leaking from inside the tank. 【Solution means】An odor prevention system is configured by a container 21 that stores treated water, a deodorizing fan 31 that sucks in the gas inside the container 21, a wind direction meter 23 that detects a wind direction detection signal Sd indicating the state of the gas inside the container, and an intake control unit 30 that changes the intake volume of the deodorizing fan 31 based on the gas information. Instead of the wind direction meter 23, an anemometer 53 or a pressure gauge 73 may be used for the odor prevention system.

Description

Technical Field

[0001] The present invention relates to an odor prevention system, an odor prevention device, and an odor prevention method for preventing the diffusion of odors to the outside in a facility for treating sewage or rainwater.

Background Art

[0002] Wastewater (hereinafter referred to as "sewage") resulting from or associated with activities other than living or farming flows into a sewage pipe or a sewer together with rainwater and reaches, for example, a sewage treatment plant. The sewage is purified at the sewage treatment plant and discharged as treated water into rivers or the sea. The sewage treatment plant has a sedimentation tank for sedimenting sewage and removing garbage, etc., and an aeration tank for exposing the sewage to air (aeration) and supplying air to promote the decomposition of contaminants by microorganisms. Odors generated from the aeration tank or sedimentation tank are sucked by a deodorizing fan through a duct and are treated such as being led to a deodorizing device as necessary.

[0003] Known techniques for controlling odors in a sewage treatment plant are described in, for example, Patent Document 1. The deodorization control system described in Patent Document 1 provides an odor sensor in a building where the odor source is located, and controls to intake outside air into the building or to discard the air inside the building after leading it to a deodorizing device, depending on the concentration and type of odor detected by the odor sensor. Also, Cited Document 1 describes that the flow of air inside the building is controlled by opening and closing dampers provided in the duct.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, in such a sewage treatment plant, as a measure against odor leakage from the aeration tank to the surroundings, the deodorizing fan is controlled to always intake air from the aeration tank at a volume equal to or greater than the maximum volume of the aeration air volume (the supply volume of air). On the other hand, the dissolved oxygen (DO) in the aeration tank is a factor that affects the state of microorganisms and varies depending on the degree of sewage pollution and the amount of water flowing in. The aeration air volume is increased or decreased to maintain the amount of dissolved oxygen necessary to suppress odor. For this reason, in the aeration tank, a state may occur where excessive intake of air occurs. To suppress the power consumption related to the sewage treatment plant and achieve cost reduction, it is preferable to suppress the excessive intake of air by the deodorizing fan and save the power supplied to the deodorizing fan.

[0006] However, since the deodorization control system described in Patent Document 1 controls the fan to take in outside air into the building or release it to the outside through the deodorization device according to the odor, saving power of the fan is not considered.

[0007] In addition, facilities that generate odors are not limited to sewage treatment plants, and there are cases where odors are generated by other factories, compost, etc. outside the sewage treatment plant. In such a case, the odor control system of Patent Document 1 has a problem that it is difficult to determine whether the odor in the environment is caused by the sewage treatment plant or other factors when taking in air from the outside into the building or discharging air to the outside through the deodorization device.

[0008] The present invention has been made in view of such points, and relates to an anti-odor system, an anti-odor device, and an anti-odor method that can reduce the cost related to odor prevention by saving power and can surely determine whether odor is leaking from inside the tank.

Means for Solving the Problems

[0009] To achieve the above object, an odor prevention system according to one embodiment of the present invention includes a container for storing treated water, an intake fan for sucking the gas inside the container, a ventilation section that communicates with the inside and the outside of the container and through which gas can flow in and out, and a gas state detection section for detecting gas information indicating the state of the gas passing through the ventilation section. An intake control unit that changes the intake air volume of an intake fan that intakes the gas inside the container based on the gas information It includes, and the gas state detection section has a wind direction for detecting the direction of the gas flowing between the inside and the outside of the container through the ventilation section. meter There is.

[0010] An odor prevention device according to one embodiment of the present invention includes a gas state detection section for detecting gas information indicating the state of the gas inside a container for storing treated water, and an intake control section for changing the intake volume of an intake fan that sucks the gas inside the container based on the gas information. The gas state detection section has a wind direction for detecting the direction of the gas flowing between the inside and the outside of the container through a ventilation section that communicates with the inside and the outside of the container and through which gas can flow in and out. meter There is.

[0011] An odor prevention method according to one embodiment of the present invention includes a step of detecting gas information indicating the state of the gas inside a container for storing treated water, and a step of changing the intake volume of an intake fan that sucks the gas inside the container based on the gas information. The step of detecting the gas information detects the direction of the gas flowing between the inside and the outside of the container through a ventilation section that communicates with the inside and the outside of the container and through which gas can flow in and out. ki Detect.

Advantages of the Invention

[0012] According to the above embodiment, it is possible to provide an odor prevention system, an odor prevention device, and an odor prevention method that can reduce the cost related to odor prevention and can surely determine whether odor is leaking from the tank.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the first embodiment, the second embodiment, and the third embodiment of the present invention will be described with reference to the drawings (the first embodiment, the second embodiment, and the third embodiment are also collectively referred to as "the present embodiment"). However, the drawings used in the description of the present embodiment are for the purpose of explaining the configuration, function, operation, effect, and technical idea of the present embodiment, and the specific shape and design are not limited by the drawings.

[0015] FIG. 1 is a diagram for explaining an environment 1 including a sewage treatment plant to which the deodorization system of the present embodiment is applied. The environment 1 includes a sewage sump 5 that collects sewage from homes, factories, etc., and sewer pipes 7 and 8 that lead the sewage flowing out of the sewage sump 5 to the sewage treatment plant. Sewage manholes 6 are provided in the sewer pipes 7 and 8. The sewage treatment plant includes a purification facility A, a chlorine mixing tank 13 that sterilizes pathogenic bacteria in the sewage (purified water) purified by the purification facility A, and a sludge treatment facility 15 that treats the sludge removed in the purification facility A. The purification facility A includes a grit chamber 9, a primary sedimentation tank 10, an aeration tank 11, and a final sedimentation tank 12. The grit chamber 9 stores sewage and removes relatively large garbage and sand. The primary sedimentation tank 10 stores the sewage flowing in from the grit chamber 9 and removes smaller garbage and sand. The sewage flows through the primary sedimentation tank 10 at a relatively low speed, and in this process, garbage and sand settle to the bottom of the primary sedimentation tank. The sewage then flows into the aeration tank 11.

[0016] The aeration tank 11 mixes activated sludge into the sewage flowing in from the primary sedimentation tank 10. Activated sludge is a group of bacteria, fungi, protozoa, and metazoans, and it is considered that various biological species are in a symbiotic and predatory relationship with each other. The purification of sewage in the aeration tank 11 is carried out by supplying oxygen (aeration) to the sewage together with the activated sludge and utilizing the fact that organic substances and some inorganic salts are required for the metabolism of microorganisms. The purification of sewage is carried out by oxidatively decomposing or absorbing and separating pollutants. The activated sludge used for purification becomes in a state where it is easy to settle.

[0017] The purified sewage and the activated sludge flow into the final sedimentation tank 12. The activated sludge settles in the process of passing through the final sedimentation tank 12 and is separated from the sewage. A part of the settled activated sludge is returned to the aeration tank 11, and the remaining sludge is transported to the sludge treatment facility 15. The treated water separated in the final sedimentation tank 12 enters the chlorine mixing tank 13 and is mixed with sodium hypochlorite for sterilization treatment of pathogenic bacteria. The purified water after the sterilization treatment is discharged into a river or the like (public water area).

[0018] (First Embodiment) FIG. 2 is a schematic diagram for explaining an odor prevention system provided in the aeration tank 11 of the first embodiment. The aeration tank 11 includes a plurality (n) of containers 21a to 21n (hereinafter also referred to as container 21 when distinction is not necessary). The container 21 includes a trough-shaped main body and a lid (not shown) covering the main body. The aeration tank 11 is provided with a facility in which a plurality of containers are accommodated, and the container 21 is installed under the floor or on the floor in the facility. FIG. 2 shows an example in which the container 21 is arranged under the floor U. In the present embodiment, the sewage accommodated in the container 21 is referred to as water to be treated. Note that the container 21 is not limited to being installed indoors, and may be outdoors, and may be installed either above or below ground outdoors.

[0019] The purification system of the present embodiment includes a container 21 in which water to be treated is accommodated, a deodorizing fan 31 (FIG. 3) that sucks the gas inside the container 21, and wind direction meters 23a to 23n (hereinafter also referred to as wind direction meter 23 when distinction is not necessary) that function as a gas state detection unit for detecting gas information indicating the state of the gas inside the container 21, and an intake control unit 30 (FIG. 3) that changes the intake air volume of the deodorizing fan based on the gas information. The container 21 contains water to be treated w, and there is a space a where gas exists above the w. A pipe 25a to a pipe 25n (hereinafter also referred to as pipe 25 when distinction is not necessary) and an end of a duct 29 are inserted into the space a of the container 21 to the container 21n.

[0020] The pipe 25 has a ventilation function of communicating the space a inside the container 21 with the space F outside the container 21. Note that the configuration for communicating the inside and outside of the container 21 is not limited to having a pipe shape, and may be, for example, an opening provided in a lid (not shown) covering the container 21.

[0021] Each of the pipes 25a to 25n is provided with a wind vane 23a to 23n. As the wind vane 23, for example, a digital wind vane that electronically measures the wind direction by a sensor is used. Further, the wind vane 23 may be a sensor that also has a function of measuring the wind speed. The wind direction detection signals Sd detected by the wind vanes 23a to 23n are input to the intake control unit 30. Note that the first embodiment is not limited to including such sensors, and for example, other odor sensors or the like may be included.

[0022] One end of the duct 29 is inserted into each of the containers 21a to 21n, and the other end is connected to a deodorizing fan (intake fan) 31. The deodorizing fan 31 entrains the gas that has passed through the duct 29 and discharges it from the duct 29. The discharged gas passes through a deodorizing tower (not shown) for purification and is then released into the atmosphere. The deodorizing tower may be, for example, a packed biological deodorizing tower filled with a microbial packing carrier in a packed tower, or a configuration combining an activated carbon adsorption tower and a soil deodorizing facility.

[0023] The duct 29 is connected to the deodorizing fan 31 and includes a main trunk 29a through which the gas of the containers 21a to 21n flows and branch portions 29b through which the gas of each of the containers 21a to 21n flows. Dampers 27a to 27n (hereinafter also referred to as dampers 27 when there is no need to distinguish) are provided between the main trunk 29a and the branch portions 29b of the duct 29 to adjust the intake air volume drawn from the containers 21a to 21n while changing the intake air volume of the deodorizing fan 31. The intake control unit 30 controls the opening degrees of the dampers 27a to 27n together with the intake air volume of the deodorizing fan 31. At this time, the intake control unit 30 outputs a control signal instructing the opening degrees to the dampers 27a to 27n and receives the ACK signal.

[0024] FIG. 3 is a diagram for explaining the intake air control unit 30. The intake air control unit 30 functions as the deodorizing device of the present embodiment. The intake air control unit 30 receives a wind direction detection signal Sd from each of the wind direction sensors 23a to 23n. Then, the intake air control unit 30 controls the amount of intake air of the deodorizing fan 31 by controlling the power supplied to the deodorizing fan 31 according to the wind direction indicated by the wind direction detection signal Sd. Further, the intake air control unit 30 controls the opening degrees of the dampers 27a to 27n based on each of the wind direction sensors 23a to 23n. The control signal Sc1 is a signal for the intake air control unit 30 to control the deodorizing fan 31. The control signal Sc2 is a signal for the intake air control unit 30 to control the opening degrees of the dampers 27a to 27n.

[0025] Note that the "power control" in the present embodiment includes not only the control of increasing or decreasing the power (current, voltage) supplied to the deodorizing fan 31, but also the control of the rotation frequency of the deodorizing fan 31, and as a result, the power consumed by the deodorizing fan 31 increases or decreases.

[0026] Next, the control of the intake air control unit 30 will be described. The wind direction detection signal Sd indicating the flow of gas from the container 21 to the space F indicates that the odor in the container 21 is leaking to the outside. In such a case, the intake air control unit 30 outputs a control signal Sc1 for increasing the amount of power supplied to the deodorizing fan 31 (the rotation speed of the fan). By increasing the amount of power supplied to the deodorizing fan 31, the pressure inside the container 21 decreases and becomes lower than the pressure in the space F. When the inside of the container 21 is in a depressurized state, the leakage of odor to the space F stops and the inflow of gas from the space F to the container 21 occurs. The intake air control unit 30 adjusts, for example, the amount of power supplied to the deodorizing fan 31 from such a state to maintain the intake air amount in a state where the inflow of gas from the space F to the container 21 stops or becomes minimal. According to such control, it is possible to supply the deodorizing fan 31 with the minimum amount of power required to prevent odor leakage according to the state of the gas inside the container 21.

[0027] In addition, in the first embodiment, a plurality of wind direction detection signals Sd are input from each of the plurality of wind direction sensors 23a to 23n to the intake control unit 30. For example, when leakage of gas in a predetermined number of containers 21 is detected among the plurality of wind direction detection signals, the intake control unit 30 may increase the power supply amount to the deodorizing fan 31 until all the wind directions of this container 21 are from the space F into the container 21. The predetermined number may be, for example, one or a plurality. The container 21 and the deodorizing fan 31 may be provided one-to-one, and each deodorizing fan 31 may intake the corresponding container 21, or one deodorizing fan 31 may intake a plurality of containers 21. Further, in the first embodiment, weights may be assigned to the containers 21, and the power supply amount to the deodorizing fan 31 may be controlled by prioritizing the wind direction detection signal Sd of this container 21. Such control is performed, for example, when the pit-shaped containers 21 are installed from the initial sedimentation tank 10 toward the final sedimentation tank 12, and a plurality of wind direction sensors 23 are provided in the flow direction of the container 21. And based on the fact that it is considered that the degree of contamination of the sewage is reduced downstream rather than upstream of the container 21, it is conceivable to prioritize the wind direction detection signal Sd of the wind direction sensor 23 provided upstream.

[0028] Furthermore, in the first embodiment, when individually controlling the intake air amounts from the containers 21a to 21n, the intake control unit 30 outputs a control signal Sc1 to the dampers 27a to 27n and individually controls the opening degrees of the dampers 27a to 27n. Such control is performed, for example, by setting the opening degree of the damper 27 to the maximum and increasing the supply power until all the wind direction detection signals Sd indicate that the wind is from the space F toward the container 21. Then, the opening degree of the damper 27 of the container 21 whose wind direction indicated by the wind direction detection signal Sd was from the space F toward the container 21 first is reduced. By doing so, it is possible to prevent excessive air from flowing into the container 21 from the space F and suitably maintain the intake air amount from the container 21.

[0029] FIG. 4 is a flowchart for explaining the deodorizing method performed by the deodorizing device according to the first embodiment. As shown in FIG. 4, the intake control unit 30 determines whether or not the wind direction detection signal Sd indicates the space F (outside the tank → inside the tank) from the container 21 (step S401). In step S401, when the wind direction detection signal Sd indicates the wind direction from outside the tank to inside the tank (step S401: YES), the intake control unit 30 controls the power supply amount to the deodorizing fan 31 so that the intake air amount decreases (step S405). Next, the intake control unit 30 determines whether or not the wind direction detection signal Sd indicates that there is no gas movement between the container 21 and the space F (outside the tank = inside the tank) (step S402). In step S402, when the wind direction detection signal Sd indicates that there is no gas movement between outside the tank and inside the tank (step S402: YES), the intake control unit 30 controls the power supply amount to the deodorizing fan 31 so that the intake air amount is maintained (step S406).

[0030] Furthermore, the intake control unit 30 determines whether or not the wind direction detection signal Sd indicates the space F from the container 21 (inside the tank → outside the tank) (step S403). In step S403, when the wind direction detection signal Sd indicates the wind direction from inside the tank to outside the tank (step S403: YES), the intake control unit 30 increases the power supply amount to the deodorizing fan 31 so that the intake air amount increases (step S407).

[0031] The first embodiment detects the wind direction detection signal Sd at regular time intervals. Therefore, the intake control unit 30 determines whether or not the next detection time has arrived (step S404). The intake control unit 30 waits until the detection time (step S404: NO), and when the detection time is reached (step S404: YES), returns to step S401 and inputs the wind direction detection signal Sd. However, the first embodiment is not limited to inputting the wind direction detection signal Sd at regular time intervals, and the wind direction detection signal Sd may be continuously input and the power supply amount to the deodorizing fan 31 may be controlled.

[0032] The odor prevention method described above is executed by a program executed on a computer. The computer is composed of known hardware such as a CPU (Central Processor Unit), memory, and communication unit, which cooperate with the program to implement the odor prevention method.

[0033] The odor prevention system, odor prevention device, and odor prevention method of the first embodiment described above control the intake air volume by increasing or decreasing the power supply amount (fan rotation speed) to the deodorization fan 31 according to the state of odor leakage. Therefore, the first embodiment can reduce the cost related to odor prevention. Also, the first embodiment detects the leakage of odor from the container by measuring the wind direction between the container 21 and the space F. Therefore, the first embodiment can surely detect the leakage of odor from each container 21 to the space F. Such a first embodiment can determine whether the odor floating in the environment is caused by sewage treatment or other reasons.

[0034] (Second Embodiment) Next, the second embodiment will be described. The drawings used in the second embodiment show the same configuration as that of the first embodiment with the same reference numerals, and the description thereof is partially omitted.

[0035] FIG. 5 is a schematic diagram for explaining the odor prevention system of the second embodiment. The odor prevention system of the second embodiment includes n containers 21. A pipe 25 and a branch portion 29b of a duct 29 are inserted into each container 21. The branch portion 29b allows the expectation of being sucked by the deodorization fan 31 through the trunk portion 29a to pass. A damper 27 is provided between the trunk portion 29a and the branch portion 29b.

[0036] An anemometer 53a to anemometer 53n (hereinafter also referred to as anemometer 53 when there is no need to distinguish each of them) is provided in each of the pipes 25 of each container 21. The anemometer 53 is not particularly limited, and for example, an ultrasonic anemometer, a Pitot tube anemometer, a hot-wire anemometer, or a laser anemometer can be considered. In the second embodiment, the anemometer 53 outputs an air velocity detection signal Se detected by it to the intake control unit 30. The intake control unit 30 compares the air velocity detection signal Se with a predetermined air velocity threshold value Vth1, threshold value Vth2, and threshold value Vth3 (Vth1 < Vth2). The intake control unit 30 controls the amount of electric power supplied to the deodorizing fan 31 according to the results of the comparison between the threshold values Vth1, Vth2 and the air velocity.

[0037] Note that the anemometer 53 is a device that measures the air velocity in a predetermined direction (for example, the direction from the space F to the container 21), and the air velocity in the opposite direction may be 0 or indicate an error. The threshold value Vth3 in the second embodiment is a numerical value indicating that the air velocity is 0 or an error. However, the second embodiment is not limited to such a configuration, and a wind direction meter may be provided together with the anemometer 53.

[0038] FIG. 6 is a flowchart for explaining the deodorization method performed by the deodorization device of the second embodiment. The flowchart shown in FIG. 6 shows an example in which the anemometer 53 measures the air velocity from the space F to the container 21. The intake control unit 30 determines whether the air velocity detection signal Se is greater than the air velocity threshold value Vth1 and less than the threshold value Vth2 (Vth1 < air velocity < Vth2) (step S601). In step S601, when the air velocity detection signal Se is greater than the threshold value Vth1 and less than the threshold value Vth2 (step S601: YES), the intake control unit 30 controls the amount of electric power supplied to the deodorizing fan 31 so that the intake air volume is maintained (step S606). Next, the intake control unit 30 determines whether the air velocity detection signal Se is greater than the threshold value Vth2 (step S602). In step S602, when the air velocity detection signal Se is greater than the threshold value Vth2 (step S602: YES), the intake control unit 30 decreases the amount of electric power supplied to the deodorizing fan 31 so that the intake air volume decreases (step S607).

[0039] In step S602, when the wind speed detection signal Se is not greater than the threshold value Vth2 (step S602: NO), the intake control unit 30 determines whether the wind speed detection signal Se is less than the threshold value Vth1 (step S603). In step S603, when the wind speed detection signal Se is less than the threshold value Vth1 (step S603: YES), the intake control unit 30 increases the power supply amount to the deodorizing fan 31 so that the intake air amount increases (step S608). Further, the intake control unit 30 determines whether the wind speed detection signal Se matches Vth3, that is, whether it corresponds to 0 or an error (step S604). As described above, 0 or an error is a numerical value indicating that the wind direction has reversed. When the wind speed detection signal Se indicates 0 or an error (step S604: YES), assuming that the gas flow from the container 21 to the space F has reversed, the intake control unit 30 increases the power supply amount to the deodorizing fan 31 so that the intake air amount increases (step S608).

[0040] The second embodiment detects the wind speed detection signal Se at regular time intervals. Therefore, the intake control unit 30 determines whether the next detection time has arrived (step S604). The intake control unit 30 waits until the detection time (step S604: NO), and when the detection time is reached (step S604: YES), returns to step 601 to input the wind speed detection signal Se. Note that also in the second embodiment, the input of the wind speed detection signal Se may be performed continuously.

[0041] Note that in the second embodiment, the intake control unit 30 may input a plurality of wind speed detection signals Se and increase the intake air volume of the deodorizing fan 31 until odor leakage is no longer detected in all the containers 21. Further, in the second embodiment, each of the plurality of deodorizing fans 31 may not only control the intake air of each corresponding container, but also control the intake air volume of one deodorizing fan in units of the plurality of containers 21. In such a case, in the second embodiment, the intake air volume of the deodorizing fan 31 may be controlled by comparing the average value of the wind speeds indicated by the plurality of wind speed detection signals Se with a predetermined threshold value. Further, in the second embodiment, weights may be assigned to the plurality of containers 21, and the value indicated by the wind speed detection signal Se corresponding to the container 21 with a large weight may be preferentially considered.

[0042] The odor prevention system, odor prevention device, and odor prevention method of the second embodiment described above detect the state of odor leakage and control the intake air volume by increasing or decreasing the power supply amount to the deodorizing fan 31. Therefore, the first embodiment can reduce the cost related to odor prevention. Further, in the second embodiment, by measuring the (one-way) wind speed between the container 21 and the space F, the degree of the gas flowing into the container 21 from the outside is detected. Further, since it is possible to detect that the air flow direction has reversed, it is possible to reliably detect the odor leakage from each container 21 to the space F. In such a second embodiment, even when odor drifts in the environment, it is possible to determine whether this odor is caused by sewage treatment or other causes.

[0043] (Third Embodiment) Next, the third embodiment will be described. The drawings used in the third embodiment show the same configurations as those in the first embodiment and the second embodiment with the same reference numerals, and the description thereof is partially omitted.

[0044] FIG. 7 is a schematic diagram for explaining the odor prevention system of the third embodiment. The odor prevention system of the third embodiment includes n containers 21. A pipe 25 and a branch portion 29b of a duct 29 are inserted into each container 21. The branch portion 29b allows the expectation to be sucked by the deodorizing fan 31 through the trunk portion 29a. A damper 27 is provided between the trunk portion 29a and the branch portion 29b.

[0045] A pressure gauge 73a to a pressure gauge 73n (hereinafter also referred to as a pressure gauge 73 when it is not necessary to distinguish each of them) is provided in each of the pipes 25 of each container 21. The pressure gauge 73 is not particularly limited, and for example, a mechanical pressure gauge, a differential pressure gauge, a manometer, a valve type pressure gauge, a differential pressure transmitter, etc. can be considered. In the third embodiment, the pressure detection signal Sf detected by the pressure gauge 73 is output to the intake air control unit 30. The intake air control unit 30 compares the pressure detection signal Sf with a preset pressure threshold value Pth1 and a threshold value Pth2 (Pth1 < Pth2). The intake air control unit 30 controls the amount of electric power supplied to the deodorizing fan 31 according to the result of comparison between the threshold values Pth1 and Pth2 and the pressure indicated by the pressure signal Sf. However, the third embodiment is not limited to providing the pressure gauge 73 in the pipe 25, and the pressure gauge 73 may be provided on a lid body (not shown) of the container 21, an outer wall communicating with the inside of the container 21, or an inner wall of the container 21.

[0046] FIG. 8 is a flowchart for explaining the deodorizing method performed by the deodorizing device according to the third embodiment. The flowchart shown in FIG. 8 compares a preset atmospheric pressure or the atmospheric pressure of the space F measured by a barometer (not shown) with the pressure measured by the pressure gauge 73. As shown in FIG. 8, the intake air control unit 30 determines whether the pressure detection signal Sf is higher than the threshold value Pth1 and lower than the threshold value Pth2 (step S801). In step S801, when the pressure indicated by the pressure detection signal Sf is higher than the threshold value Pth1 and lower than the threshold value Pth2 (step S801: YES), the intake air control unit 30 controls the amount of electric power supplied to the deodorizing fan 31 so that the intake air volume is maintained (step S806). Next, the intake air control unit 30 determines whether the pressure indicated by the pressure detection signal Sf is smaller than the threshold value Pth1 (step S802). In step S802, when the pressure indicated by the pressure detection signal Sf is smaller than the threshold value Pth1 (step S802: YES), the intake air control unit 30 decreases the amount of electric power supplied to the deodorizing fan 31 so that the intake air volume decreases (step S807).

[0047] In step S802, when the pressure indicated by the pressure detection signal Sf is not less than the threshold value Pth1 (step S802: NO), the intake air control unit 30 determines whether the pressure indicated by the pressure detection signal Sf is higher than the threshold value Pth2 (step S803). The threshold value Pth2 is a threshold value at which the air pressure in the container 21 becomes equal to or higher than the air pressure in the space F, that is, a threshold value at which the flow of gas from the container 21 to the space F can be detected. When the pressure indicated by the pressure detection signal Sf is higher than the threshold value Pth2 (step S803: YES), the intake air control unit 30 increases the power supply amount to the deodorizing fan 31 so that the intake air amount increases (step S808).

[0048] Furthermore, the intake air control unit 30 determines whether the pressure detection signal Sf is an error signal (step S804). In step S804, when the pressure detection signal Sf is an error signal (step S804: YES), the intake air control unit 30 increases the power supply amount to the deodorizing fan 31 so that the intake air amount increases (step S808). Note that the determination in step S804 takes into account the case where the airtightness of the container 21 cannot be sufficiently obtained and the measurement of the pressure is inaccurate. The third embodiment prevents the leakage of odor from the container 21 by increasing the intake air amount when sufficient reliability cannot be obtained for the measured value of the pressure. Also, in the third embodiment, when the pressure detection signal Sf is an error signal, an alarm indicating that the error signal has been detected may be output to the outside.

[0049] The third embodiment detects the pressure detection signal Sf at regular time intervals. Therefore, the intake air control unit 30 determines whether the next detection time has arrived (step S804). The intake air control unit 30 waits until the detection time (step S804: NO), and when the detection time is reached (step S804: YES), returns to step 801 to input the pressure detection signal Sf. However, the detection of the pressure detection signal Sf is not limited to being performed at regular time intervals, and may be performed continuously.

[0050] Note that in the third embodiment, the intake control unit 30 may input a plurality of pressure detection signals Sf and increase the intake air volume of the deodorizing fan 31 until no odor leakage is detected in all the containers 21. Further, in the third embodiment, not only the wind speed of each container may be controlled, but also the intake air volume of one deodorizing fan may be controlled in units of a plurality of containers 21. Also, in the third embodiment, weights may be assigned to the plurality of containers 21, and the value indicated by the pressure detection signal Sf corresponding to the container 21 with a large weight may be preferentially considered.

[0051] The odor prevention system, odor prevention device, and odor prevention method of the present embodiment described above control the intake air volume by increasing or decreasing the power supply amount to the deodorizing fan 31 according to the state of odor leakage. Therefore, the present embodiment can reduce the cost related to odor prevention. Also, in the first embodiment and the second embodiment, by measuring the gas flow between the container 21 and the outside, the possibility of odor flowing out from the container 21 to the outside can be detected. In the third embodiment, by measuring the pressure inside the container 21, the possibility of odor flowing out from the container 21 to the outside can be detected. Such a present embodiment can determine whether the odor floating in the environment is caused by sewage treatment or other causes even when there is odor in the environment.

Explanation of Reference Numerals

[0052] 1 Environment 5 Sewage Tank 6 Sewage Manhole 7, 8 Sewer Pipe 9 Sand Sedimentation Tank 10 Primary Sedimentation Tank 11 Aeration Tank 12 Final Sedimentation Tank 13 Chlorine Mixing Tank 21 Container 23 Wind Direction Meter 25 Pipe 27 Damper 29 Duct 30 Intake Control Unit 31 Deodorizing Fan 53 Anemometer 73 Pressure Gauge

Claims

1. A container for containing treated water, An intake fan for sucking in the gas inside the container, A ventilation part that communicates with the inside and the outside of the container and through which gas can flow in and out, A gas state detection part for detecting gas information indicating the state of the gas passing through the ventilation part, An intake control part for changing the intake volume of the intake fan that sucks in the gas inside the container based on the gas information, and The gas state detection part is an anemometer for detecting the direction of the gas flowing between the inside and the outside of the container through the ventilation part. An anti-odor system.

2. A gas state detection part for detecting gas information indicating the state of the gas inside the container for containing treated water, An intake control part for changing the intake volume of the intake fan that sucks in the gas inside the container based on the gas information, and The gas state detection part is an anemometer for detecting the direction of the gas flowing between the inside and the outside of the container through a ventilation part that communicates with the inside and the outside of the container and through which gas can flow in and out. An anti-odor device.

3. The intake control part controls the opening degree of the damper between the container and the intake fan based on the gas information. The anti-odor device according to Claim 2.

4. A step of detecting gas information indicating the state of the gas inside the container for containing treated water, A step of changing the intake volume of the intake fan that sucks in the gas inside the container based on the gas information, and The step of detecting the gas information is to detect the direction of the gas flowing between the inside and the outside of the container through a ventilation part that communicates with the inside and the outside of the container and through which gas can flow in and out. An anti-odor method.

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