Sewage treatment system

Abstract

To provide a sewage treatment system capable of reducing power consumption used in sewage treatment facilities by utilizing space resources possessed by the sewage treatment facilities and also contributing to the prevention of global warming.SOLUTION: The sewage treatment system 1 includes a solar power generation device 17 that converts solar energy into electricity, a reaction tank 13 in which biological treatment by microorganisms is performed on sewage, and an electrolysis device 15 that performs electrolysis using electricity converted by the solar power generation device 17 on treatment water subjected to the biological treatment in the reaction tank 13 and feeds oxygen generated by the electrolysis into the reaction tank 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sewage treatment system in which sewage is subjected to biological treatment using microorganisms. [Background technology]

[0002] Sewage generated in homes and factories, as well as rainwater that falls on roads, is carried through sewer pipes to sewage treatment plants. The sewage (sewage) carried to the sewage treatment plant generally enters a grit chamber to settle and remove large debris and sand contained in the sewage.

[0003] Next, after removing large debris and sand, the sewage enters the initial settling tank. Here, the sewage flows slowly, allowing the small debris and sand that did not sink in the settling tank to settle and be removed.

[0004] Next, the sewage that has passed through the initial settling tank enters the reaction tank. Here, mud containing bacteria and other microorganisms is mixed into the sewage and stirred, allowing the microorganisms to break down the dirt and cause it to stick together, forming clumps (microbial sludge).

[0005] The treated water then passes through the reaction tank and enters the final settling tank, where the microbial sludge produced in the reaction tank is allowed to settle over time and removed.

[0006] Finally, the treated water that has passed through the final settling tank enters the disinfection facility, where disinfectants such as chlorine are added to sterilize the water before it is discharged into the sea or river.

[0007] In the reaction tanks of the sewage treatment facilities, air is pumped into the sewage containing microorganisms in the reaction tank, and the oxygen contained in the air activates the microorganisms, accelerating the decomposition of organic matter.

[0008] Regarding the introduction of air into the reaction tank, as described in Patent Document 1, a blower 34 has been provided in an aeration tank 32 (corresponding to a reaction tank) that receives the supernatant liquid from a primary sedimentation tank 31, and this blower 34 is driven to introduce air into the sewage containing microorganisms in the aeration tank 32. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 4671888 Summary of the Invention [Problem to be solved by the invention]

[0010] However, a large amount of electricity is required to operate the blower, and it is generally said that approximately 40% of the electricity consumed at a sewage treatment facility is used to operate the blower, making reducing the amount of electricity used to operate this blower a major issue.

[0011] In this regard, sewage treatment plants often have large land areas because they slowly turn sewage into clean water by letting it flow. Also, in general, the grit chambers in sewage treatment plants are located underground, and the rest of the plant is above ground, but is closed off with concrete or a lid. Therefore, there are vast spatial resources above ground.

[0012] Therefore, the present invention aims to provide a sewage treatment system that can utilize the spatial resources of a sewage treatment facility to reduce the amount of electricity consumed by the facility, and also contribute to preventing global warming. [Means for solving the problem]

[0013] The present invention includes a power generation device that converts natural energy into electricity, a biological treatment tank in which biological treatment using microorganisms is performed on the sewage; an electrolysis device that performs electrolysis using electricity converted by the power generation device on the treated water that has been biologically treated in the biological treatment tank, and sends the oxygen generated by the electrolysis to the biological treatment tank; It is a sewage treatment system equipped with:

[0014] Conventionally, oxygen has been sent to the biological treatment tank mainly using a blower in order to activate biological treatment by microorganisms. However, with the above configuration, oxygen generated by electrolysis of treated water using natural energy can be sent to the biological treatment tank, thereby activating biological treatment by microorganisms. This reduces the amount of power consumed by using the blower (by lowering the blower's rotation speed), which also contributes to preventing global warming.

[0015] The present invention also provides the sewage treatment system, further comprising: a blower that sends air into the biological treatment tank; a measuring unit for acquiring information necessary to adjust the oxygen concentration of the treated water in the biological treatment tank to an appropriate oxygen concentration for the biological treatment; The system may further include a control device that controls the amount of air sent from the blower to the biological treatment tank based on the information acquired by the measurement unit.

[0016] With this configuration, the information necessary to adjust the oxygen concentration of the treated water in the biological treatment tank to an appropriate level for biological treatment, to which oxygen generated by the electrolysis device is sent, can be obtained, and based on the obtained information, the amount of air containing the necessary amount of oxygen can be sent from the blower to the biological treatment tank. This allows for stabilization of biological treatment by microorganisms in the biological treatment tank, while reducing the rotation speed of the blower and reducing power consumption.

[0017] Further, the present invention provides the sewage treatment system, further comprising a disinfection facility for disinfecting treated water that has undergone the biological treatment in the biological treatment tank, The electrolyzer may be installed between the biological treatment tank and the disinfection equipment.

[0018] Generally, when treated water purified in a biological treatment tank or the like is discharged into the sea or a river, the treated water is sterilized by adding a disinfectant, etc. According to the above configuration, the electrolysis of the treated water by the electrolyzer is carried out at a stage before disinfection by the disinfection equipment, so that the treated water can be electrolyzed without being affected by the disinfectant used in the disinfection equipment. That is, even if an electrolysis device is installed in a sewage treatment system, there is no need to restrict the disinfectants used in the disinfection equipment, as compared to the conventional case.

[0019] In the sewage treatment system of the present invention, the oxygen generated by electrolysis in the electrolyzer may be sent downstream of the biological treatment tank.

[0020] According to the above configuration, by sending oxygen generated by electrolysis to the downstream side of the biological treatment tank, biological treatment by microorganisms on the downstream side of the biological treatment tank can be activated. This reduces the amount of oxygen sent by the blower downstream of the biological treatment tank, allowing the blower's rotation speed to be lowered, which prevents the microbial sludge downstream of the biological treatment tank from breaking down (becoming too physically fine) and causing poor settling of the microbial sludge, which would be caused by a high blower rotation speed downstream of the biological treatment tank.

[0021] The present invention also provides the sewage treatment system, The plant may further include a hydrogen utilization facility in which the hydrogen electrolyzed by the electrolysis device is utilized as electrical energy or stored.

[0022] According to the above configuration, hydrogen generated by electrolysis of the treated water can be effectively utilized. [Effects of the Invention]

[0023] By utilizing the spatial resources of a sewage treatment facility, it is possible to reduce the amount of power consumed by the facility, thereby providing a sewage treatment system that also contributes to preventing global warming. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic diagram of a sewage treatment system according to an embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory diagram of a reaction tank according to the present embodiment. [Figure 3] FIG. 10 is a schematic diagram of a sewage treatment system according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment of a sewage treatment system 1 according to the present invention will be described below.

[0026] (Sewage Treatment System 1) As shown in Fig. 1, the sewage treatment system 1 is equipped with, from upstream to downstream, a grit basin 11, a primary sedimentation basin 12, a reaction tank 13 (corresponding to a biological treatment tank), a final sedimentation basin 14, an electrolysis device 15, and a disinfection facility 16. The sewage treatment system 1 also includes a solar power generation device 17 that converts solar energy into electricity and a fuel cell 18 (corresponding to a hydrogen utilization facility) within its facilities. The sewage treatment system 1 also includes a management building within its facilities, and a computer 19 (corresponding to a control device) that controls and manages the sewage treatment system 1 is installed in the control room of the management building.

[0027] (Sand trap 11) The grit basin 11 is an artificial pond into which sewage (polluted water) generated in homes and factories, etc., is poured through sewer pipes and used to settle and remove large debris and sand contained in the sewage.

[0028] (Primary sedimentation tank 12) The primary sedimentation basin 12 is an artificial basin into which the sewage from which large garbage and sand have been removed in the grit basin 11 is slowly passed, and into which small garbage and sand that have not settled in the grit basin 11 are allowed to settle and be removed.

[0029] (Reaction Tank 13) The reaction tank 13 is a biological treatment tank in which mud containing microorganisms such as bacteria is added to and stirred into the sewage that has passed through the initial settling tank 12, and the microorganisms decompose the impurities in the sewage and cause the impurities to stick together and form clumps (microbial sludge).

[0030] 2, the reaction tank 13 is separated into three reaction tanks by two walls 134 and 135. Specifically, from the upstream side to the downstream side, the reaction tank 13 is separated into a first reaction tank 131, a second reaction tank 132, and a third reaction tank 133. In addition, the two walls 134 and 135 are provided with through holes (not shown) so that the sewage that has passed through the primary sedimentation tank 12 flows in the order of the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133. The number of reaction vessels in the reaction tank 13 is not particularly limited, and may be one, two, or four or more.

[0031] The reaction tank 13 is also provided with a blower 139. The blower 139 can send air through a pipe 139A to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133. The blower 139 also plays a role in stirring the treated water in the reaction tank 13 to equalize the oxygen concentration.

[0032] An oxygen concentration meter 136A that measures the amount of oxygen in the air sent to the first reaction tank 131 is provided in the pipe 139A that leads from the blower 139 to the first reaction tank 131 (see FIG. 2). In addition, an oxygen concentration meter 136B that measures the amount of oxygen in the air sent to the second reaction tank 132 is provided in the pipe 139A that leads from the blower 139 to the second reaction tank 132. Similarly, an oxygen concentration meter 136C that measures the amount of oxygen in the air sent to the third reaction tank 133 is provided in the pipe 139A that leads from the blower 139 to the third reaction tank 133. As shown in FIG. 2, an oxygen concentration meter 136D for measuring the oxygen concentration of the treated water that has passed through the reaction tank 13 is provided in the flow path between the reaction tank 13 and the final settling tank 14. Furthermore, the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 are respectively equipped with measuring devices 136E, 136F, and 136G for measuring the oxygen concentration, water temperature, pH, etc. of the treated water in the tanks. As shown in FIG. 2, a flow meter 136H is provided in the flow path between the primary sedimentation tank 12 and the reaction tank 13.

[0033] In the control room of the administration building, a computer 19 can control the amount of air sent from blower 139 to first reaction tank 131, second reaction tank 132, and third reaction tank 133 based on the values ​​measured by oxygen concentration meters 136A, 136B, and 136C, the value measured by oxygen concentration meter 136D, the values ​​measured by measuring instruments 136E, 136F, and 136G, and / or the value of flow meter 136H, in order to adjust the oxygen concentration of the treated water in reaction tank 13, to which oxygen generated by electrolysis device 15 has been sent, to an appropriate level for biological treatment. For example, the computer 19 controls the amount of air to be sent from the blower 139 (by controlling the motor speed of the blower 139, etc.) to which of the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 (by controlling the opening and closing of the valves in the piping, etc.) depending on the oxygen concentration value of the treated water (treated water discharged from the reaction tank 13) measured by the oxygen concentration meter 136D, while taking into consideration the values ​​measured by the oxygen concentration meters 136A, 136B, and 136C (to determine the amount of air to be sent), the oxygen concentration, water temperature, and pH value of the treated water measured by the measuring instruments 136E, 136F, and 136G (to determine the environment suitable for biological treatment), and the value of the flow meter 136H (to determine the amount of sewage flowing into the reaction tank 13).

[0034] The first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 are provided with a pipe 138 through which oxygen electrolyzed in the electrolyzer 15, which will be described later, is sent. In the control room of the administration building, a computer 19 can be used to control which of the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 is to be supplied to (by controlling the opening and closing of the piping valves, etc.) and how much oxygen is to be supplied (by controlling the oxygen supply from the electrolyzer 15, etc.).

[0035] In this embodiment, the electrolyzed oxygen in the electrolyzer 15 is sent to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133. However, the present invention is not limited to this, and the oxygen generated by electrolysis in the electrolyzer 15 may be sent only to the third reaction tank 133 provided downstream of the reaction tank 13.

[0036] (Final sedimentation tank 14) The final settling tank 14 is an artificial pond for removing microbial sludge contained in the treated water that has passed through the reaction tank 13 by allowing it to settle over time.

[0037] (Electrolyzer 15) The electrolyzer 15 is a device that electrolyzes treated water that has passed through the final settling tank, using electricity generated from solar energy by a solar panel of a solar power generation device 17 (described later). Specifically, the electrolyzer 15 is equipped with a tank that can store treated water and two electrodes with an anode and a cathode. When electricity is passed through the treated water from the two electrodes, the treated water is electrolyzed, generating hydrogen at the cathode and oxygen at the anode (2H2O → 2H2 + O2).

[0038] The electrolyzer 15 is also provided with a pipe 138 that sends electrolyzed oxygen to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 of the reaction tank 13. The pipe 138 may be connected to a pipe 139A that leads from the blower 139 to the first reaction tank 131. In the control room of the administration building, a computer 19 controls the operating mode of the electrolyzer 15, the opening and closing of the valves of the piping 138, the amount of oxygen generated to be supplied, and so on, thereby controlling how much oxygen is sent to each of the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133.

[0039] The electrolyzer 15 is also provided with a pipe 181 for sending electrolyzed hydrogen to the fuel cell 18. In the control room of the administration building, a computer 19 controls the operation of the electrolyzer 15 and the amount of hydrogen generated, thereby controlling how much hydrogen is fed to the fuel cell 18. If a hydrogen tank is installed, hydrogen not fed to the fuel cell 18 can be stored in the hydrogen tank.

[0040] (Disinfection equipment 16) The disinfection equipment 16 is a facility that sterilizes the treated water that has passed through the electrolyzer 15 and the treated water that flows directly from the final sedimentation tank 14 by adding a disinfectant such as chlorine. The treated water disinfected in the disinfection equipment 16 is discharged into the sea or a river.

[0041] (Solar power generation equipment 17) The solar power generation device 17 includes a solar panel, a power conditioner, a storage battery, etc. The solar power generation device 17 can transmit electricity generated from solar energy by the solar panel directly to the electrolyzer 15 or after storing the electricity in a storage battery.

[0042] In this embodiment, a solar power generation device 17 that generates electricity from solar energy using a solar panel is used as the power generation device that converts natural energy into electricity, but a wind power generation device that converts wind energy into electricity may also be used, or a hydroelectric power generation device that generates electricity using the flow of sewage may also be used.

[0043] (fuel cell 18) The fuel cell 18 is a power generation device that generates electrical energy and thermal energy by chemically reacting hydrogen obtained by electrolyzing the treated water in the electrolyzer 15 with oxygen in the air. The electric energy and thermal energy generated by the fuel cell 18 can be utilized for heating and cooling equipment in the administration building of the sewage treatment system 1 and the like.

[0044] The electric energy generated by the fuel cell 18 may be stored in a storage battery as DC electric energy. Furthermore, the DC electric energy stored in the storage battery may be converted into AC electric energy and sold, or may be transmitted to the electrolyzer 15 when the solar power generation device 17 cannot be used, such as at night, on cloudy days, or on rainy days.

[0045] (Operation of sewage treatment system 1) The sewage that has passed through the grit basin 11 and the primary sedimentation basin 12 flows into the reaction tank 13 with large and small garbage and sand removed.

[0046] Next, the sewage that flows into the reaction tank 13 from the primary sedimentation tank 12 flows through the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 in that order, and as it flows, mud containing microorganisms such as bacteria is added and the water is stirred by air sent in by the blower 139.

[0047] In this embodiment, by controlling the operating mode of the electrolyzer 15, the opening and closing of the valves of the piping 138, the amount of oxygen supplied, etc., it is possible to send oxygen generated in the electrolyzer 15 to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133.

[0048] In this way, in the reaction tank 13, the oxygen contained in the air sent in by the blower 139 and the oxygen generated by the electrolysis device 15 activates microorganisms such as bacteria, which decomposes the sewage dirt and causes the dirt to stick together to create a mass (microbial sludge).

[0049] Furthermore, in the control room of the administration building, the computer 19 can control the amount of air sent from the blower 139 to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133 based on the values ​​measured by the oxygen concentration meters 136A, 136B, and 136C, the value measured by the oxygen concentration meter 136D, the values ​​measured by the measuring instruments 136E, 136F, and 136G, and / or the value of the flow meter 136H, in order to adjust the oxygen concentration of the treated water in the reaction tank 13, to which oxygen generated by the electrolyzer 15 has been sent, to an appropriate oxygen concentration for biological treatment. Specifically, the computer 19 can control the amount of air sent from the blower 139 to each of the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133, by controlling the opening and closing of the valve of the pipe 139A and the rotation speed of the motor of the blower 139.

[0050] For example, if the computer 19 determines that the oxygen concentration value of the treated water (treated water discharged from the reaction tank 13) measured by the oxygen concentration meter 136D is equal to or higher than a predetermined optimum value, the computer 19 controls the blower 139 to reduce the amount of air sent to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133, for example by lowering the rotation speed of the motor, while taking into consideration the values ​​measured by the oxygen concentration meters 136A, 136B, and 136C (to determine the amount of air to be sent), the oxygen concentration, water temperature, and pH values ​​of the treated water measured by the measuring instruments 136E, 136F, and 136G (to determine the environment suitable for biological treatment), and the value of the flow meter 136H (to determine the amount of sewage flowing into the reaction tank 13). This reduces the amount of power consumed by the blower 139. On the other hand, if the computer 19 determines that the oxygen concentration value of the treated water (treated water discharged from the reaction tank 13) measured by the oxygen concentration meter 136D is less than a preset optimum value, the computer 19 controls the blower 139 to increase the amount of air sent from the blower 139 to the first reaction tank 131, the second reaction tank 132, and the third reaction tank 133, for example, by increasing the rotation speed of the motor of the blower 139. This makes it possible to stabilize the biological treatment by microorganisms in the first reaction tank 131.

[0051] In addition, in the control room of the administration building, a computer 19 may be used to control the supply of oxygen generated by electrolysis in the electrolyzer 15 to the third reaction tank 133 provided downstream of the reaction tank 13. This activates biological treatment by microorganisms in the third reaction tank 133, reduces the amount of air sent to the third reaction tank 133 by the blower 139, and allows the rotation speed of the blower 139 motor to be reduced. This prevents the adverse effect of the microbial sludge in the third reaction tank 133 becoming disintegrated (physically becoming too fine) due to an increase in the rotation speed of the motor of the blower 139 in the third reaction tank 133, resulting in poor settling of the microbial sludge. As a result, by flowing treated water into the final settling tank 14 in a state where the microbial sludge in the third reaction tank 133 has been well settled, the treatment time in the final settling tank 14 can be shortened.

[0052] Next, the treated water flows from the reaction tank 13 into the final settling tank 14, where the microbial sludge contained in the treated water is removed by settling over time.

[0053] Next, the treated water taken from the final settling tank 14 into the tank of the electrolyzer 15 is electrolyzed using electricity generated from solar energy by the solar panels of the solar power generator 17. As a result, the treated water is electrolyzed to produce hydrogen and oxygen.

[0054] As described above, the oxygen generated in the electrolyzer 15 is sent to the first reaction vessel 131, the second reaction vessel 132, and the third reaction vessel 133 of the reaction tank 13.

[0055] Meanwhile, the hydrogen generated in the electrolyzer 15 is fed to the fuel cell 18 . In the fuel cell 18, electric energy and thermal energy are generated by a chemical reaction between the hydrogen obtained by electrolyzing the treated water in the electrolyzer 15 and oxygen in the air. The electric energy and thermal energy generated in the fuel cell 18 are used for heating and cooling equipment in the management building of the sewage treatment system 1, etc. The electric energy generated by the fuel cell 18 may be stored in a storage battery as DC electric energy. Furthermore, the DC electric energy stored in the storage battery may be converted into AC electric energy and sold, or may be transmitted to the electrolyzer 15 when the solar power generation device 17 cannot be used, such as at night, on cloudy days, or on rainy days. This allows the hydrogen generated by electrolysis of the treated water in the electrolyzer 15 to be effectively utilized.

[0056] Finally, the treated water that has passed through the tank of the electrolyzer 15 and the treated water that flows directly from the final sedimentation tank 14 are disinfected in the disinfection equipment 16 by adding a disinfectant such as chlorine.

[0057] The treated water is then disinfected in disinfection equipment 16 and discharged into the sea or river.

[0058] Conventionally, air has been sent into the reaction tank 13 mainly using a blower 139 in order to activate biological treatment by microorganisms. However, according to the sewage treatment system 1, oxygen generated by electrolysis of treated water using solar energy is sent into the reaction tank 13, thereby activating biological treatment by microorganisms. This allows the power consumption of the blower 139 to be reduced by, for example, lowering the rotation speed of the motor of the blower 139, which also contributes to preventing global warming.

[0059] Furthermore, when treated water purified by the reaction tank 13 or the like is discharged into the sea or a river, the treated water is generally sterilized by adding a disinfectant or the like to the treated water. According to the sewage treatment system 1, the electrolyzer 15 is installed between the reaction tank 13 and the disinfection equipment 16. Therefore, the electrolysis of the treated water by the electrolyzer 15 is performed at a stage before the disinfection by the disinfection equipment 16, so that the treated water can be electrolyzed without being affected by the disinfectant used in the disinfection equipment 16. That is, even if the electrolyzer 15 is installed in the sewage treatment system 1, there is no need to limit the disinfectant used in the disinfection equipment 16, as compared to the conventional method.

[0060] Furthermore, in the sewage treatment system 1, the electrolyzer 15 is installed downstream of the final settling tank 14. Because a large amount of microbial sludge is suspended in the treated water immediately after biological treatment in the reaction tank 13, it is considered inefficient to electrolyze the treated water at this stage. Therefore, by performing electrolysis on relatively clean treated water from which the microbial sludge contained in the treated water has been removed by settling in the final settling tank 14, oxygen and hydrogen can be efficiently generated.

[0061] (Other embodiments) (1) In the above embodiment, the hydrogen electrolyzed by the electrolyzer 15 is used as energy in the fuel cell 18, but the hydrogen electrolyzed by the electrolyzer 15 may also be stored in a hydrogen tank (corresponding to a hydrogen utilization facility).

[0062] Alternatively, methanol may be produced using hydrogen electrolyzed by the electrolyzer 15, carbon dioxide, and a copper-based solid catalyst. The produced methanol can be used to promote denitrification in the aerobic tank in order to activate the microorganisms in the reaction tank 13. In this way, not only the oxygen electrolyzed by the electrolyzer 15 but also the hydrogen can be used to activate the biological treatment by the microorganisms in the reaction tank 13.

[0063] (2) In the above embodiment, oxygen concentration meters 136A, 136B, 136C, oxygen concentration meter 136D, measuring instruments 136E, 136F, 136G, and flow meter 136H are exemplified as measuring units that acquire information necessary to adjust the oxygen concentration of the treated water in reaction tank 13 to an appropriate oxygen concentration for biological treatment, to which oxygen generated by electrolysis device 15 is sent. However, any one or more of these conditions may be combined, and measuring instruments that measure the concentrations of ammonia and nitrate in the treated water may also be used.

[0064] (3) According to the sewage treatment system 1 of the above embodiment, as shown in Fig. 1, the electrolyzer 15 is installed between the reaction tank 13 and the disinfection equipment 16. However, this is not limiting, and as shown in a sewage treatment system 101 of Fig. 3, the electrolyzer 15 may be installed downstream of the disinfection equipment 16. In the sewage treatment system 101, the treated water discharged from the disinfection equipment 16 is in a clean state just before being discharged into the sea or a river. Therefore, by subjecting the treated water at this stage to electrolysis, oxygen and hydrogen can be efficiently generated. [Explanation of symbols]

[0065] 1. Sewage treatment system 11 Settling basin 12 Primary sedimentation tank 13 Reaction Tank 139 Blower 14 Final settling tank 15 Electrolyzer 16 Disinfection equipment 17. Solar power generation equipment 18 Fuel Cell 19. Computer

Claims

1. A power generation device that converts natural energy into electricity, a biological treatment tank in which biological treatment using microorganisms is performed on the sewage; an electrolysis device that performs electrolysis using electricity converted by the power generation device on the treated water that has been biologically treated in the biological treatment tank, and sends the oxygen generated by the electrolysis to the biological treatment tank; A sewage treatment system equipped with

2. a blower that sends air into the biological treatment tank; a measuring unit for acquiring information necessary to adjust the oxygen concentration of the treated water in the biological treatment tank to an appropriate oxygen concentration for the biological treatment; The sewage treatment system according to claim 1 , further comprising: a control device that controls the amount of air sent from the blower to the biological treatment tank based on the information acquired by the measurement unit.

3. Further provided is a disinfection facility for disinfecting the treated water that has undergone the biological treatment in the biological treatment tank, The sewage treatment system according to claim 1 , wherein the electrolyzer is installed between the biological treatment tank and the disinfection equipment.

4. 2. The sewage treatment system according to claim 1, wherein the oxygen generated by electrolysis in the electrolyzer is sent downstream of the biological treatment tank.

5. The sewage treatment system according to claim 1 , further comprising a hydrogen utilization facility in which the hydrogen electrolyzed by the electrolyzer is utilized as electrical energy or stored.

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