Pumps, storage tanks, and liquid treatment equipment

Abstract

To provide a pump that is simply constructed and capable of pumping liquid stored in a storage tank above its water surface and easily discharge it, and a storage tank equipped with this pump and a sewage treatment apparatus.SOLUTION: A pump for pumping liquid above the water surface and discharging it includes an umbrella part for collecting gas generated by a reaction of a catalyst or microorganism in the above liquid, a liquid inlet for introducing the above liquid below and a gas supply part through which the gas collected by the above umbrella part is supplied via a gas supply channel above, a first channel having a connecting part in the middle, and a second channel having a curved part that is connected to the above first channel at the above connecting part and that curves from downward to upward below the connecting part, and a discharge part that discharges the above liquid above the curved part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water pump, a storage tank, and a liquid treatment device. [Background technology]

[0002] A sewage treatment system is known that includes multiple septic tanks (storage tanks) and purifies the sewage in stages by passing the sewage through the multiple septic tanks from upstream to downstream. In some of these sewage treatment systems, in order to efficiently purify the sewage, a portion of the treated water stored in the downstream septic tank is returned to the upstream septic tank.

[0003] A backflow generator is known that is installed in a sewage treatment plant and includes a withdrawal pipe for returning a portion of the sewage stored in a downstream septic tank to an upstream septic tank (see JP 2010-207662 A). This backflow generator includes the withdrawal pipe, a U-shaped pipe with one end facing upward and the other end connected to the middle of the withdrawal pipe, a casing in which the withdrawal pipe and U-shaped pipe are disposed, and an air supply device for supplying air to the casing. A portion of the treated water flows into the casing from the downstream septic tank. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-207662 Summary of the Invention [Problem to be solved by the invention]

[0005] In the backflow generating device described in the above publication, the air supply device continues to supply air to lower the level of treated water in the casing, and this lowering of the water level causes the treated water in the withdrawal pipe to flow back into the upstream septic tank.

[0006] That is, the backflow generating device is provided with a withdrawal pipe, a U-shaped pipe, and a casing for storing treated water and air in order to return treated water from a downstream septic tank to an upstream septic tank. In this way, it can be configured as a device for returning treated water (liquid) by intermittently and temporarily backflowing a large amount of treated water from the downstream septic tank, storing it in the casing, and continuously returning it to the upstream septic tank. However, on the other hand, because it is a relatively large and complex configuration, it may be difficult to reduce the size and cost of this device, and ultimately the device (sewage treatment device) including this device.

[0007] Furthermore, since the air supply device is generally powered by electricity, it may be difficult to reduce running costs and save energy.

[0008] In view of the above circumstances, an object of the present invention is to provide a water pump that has a simple configuration and does not require a power source such as electricity, and a storage tank and liquid treatment device that include this water pump. [Means for solving the problem]

[0009] One aspect of the present invention, which has been made to solve the above-mentioned problems, is a water pump for pumping a liquid above the water surface and discharging it, and is equipped with an umbrella portion for collecting gas generated by the reaction of a catalyst or microorganism in the liquid, a liquid inlet port below which introduces the liquid, a gas supply port above which the gas collected by the umbrella portion is supplied via a gas supply flow path, a first flow path having a communication portion in the middle, and a second flow path that communicates with the first flow path at the communication portion, has a curved portion that curves from downward to upward below the communication portion, and a discharge port above the curved portion for discharging the liquid.

[0010] Another aspect of the present invention, which has been made to solve the above-mentioned problems, is a storage tank that stores a liquid and a catalyst or microorganism that generates gas by reacting with the liquid, and has the above-mentioned pump.

[0011] Another aspect of the present invention, which has been made to solve the above-mentioned problems, is a liquid treatment device having a plurality of storage tanks and the above-mentioned pump, wherein at least one of the plurality of storage tanks stores a liquid and a catalyst or microorganism that generates gas by reacting with the liquid, the umbrella portion is arranged in the one storage tank, and the first flow path and the second flow path are arranged in the other storage tanks. [Effects of the Invention]

[0012] The pump of the present invention has a simple configuration and can discharge liquid without using a power source such as electricity. The storage tank and liquid treatment device of the present invention have the pump, so they can discharge liquid at low cost. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic plan view showing a water pump according to one embodiment of the present invention and a storage tank equipped with the water pump. [Figure 2] FIG. 2 is a schematic plan view perspective view showing a liquid treatment device according to another embodiment of the present invention. [Figure 3] FIG. 3 is a schematic top perspective view of the sewage treatment device of FIG. [Figure 4] FIG. 4 is a schematic right side perspective view of the sewage treatment device of FIG. [Figure 5] FIG. 5 is a schematic plan view showing a water pump different from that shown in FIG. [Figure 6] FIG. 6 is a schematic plan view showing a water pump different from those shown in FIGS. [Figure 7] FIG. 7 is a schematic plan view showing a water pump different from those shown in FIGS. [Figure 8] FIG. 8 is a schematic plan view showing a water pump different from those shown in FIGS. [Figure 9] FIG. 9 is a schematic plan view showing a water pump different from those shown in FIGS. 1, 5, 6, 7 and 8. In FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] One aspect of the present invention is a water pump for pumping a liquid above the water surface and discharging it, comprising: an umbrella portion for collecting gas generated by the reaction of a catalyst or microorganism in the liquid; a liquid inlet port below for introducing the liquid; a gas supply port above for supplying the gas collected by the umbrella portion via a gas supply flow path; a first flow path having a communication portion in the middle; and a second flow path that communicates with the first flow path at the communication portion, has a curved portion that curves from downward to upward below the communication portion, and a discharge port above the curved portion for discharging the liquid.

[0015] The pump discharges the liquid using gas generated by a catalyst or microorganism reacting in the liquid, and therefore does not require a power source such as electricity. This reduces running costs and energy consumption. The pump is simply configured, consisting of an umbrella portion for collecting the gas, a first flow path, and a second flow path. The first flow path has a liquid inlet through which the liquid is introduced downward and a gas supply port through which the gas is supplied from above. The second flow path is connected to the first flow path through a communication portion and communicates with the first flow path. The second flow path has a curved portion that curves from downward to upward below the communication portion and a discharge port above the curved portion through which the liquid is discharged. This configuration allows the pump to easily discharge the liquid.

[0016] The umbrella portion is preferably disposed in the liquid, so that the gas can be easily collected.

[0017] Another aspect of the present invention is a storage tank that stores a liquid and a catalyst or microorganism that generates a gas by reacting with the liquid, and has the above-mentioned pump.

[0018] The reservoir can eject the liquid by using gas generated from the liquid stored in the reservoir itself.

[0019] Yet another aspect of the present invention is a liquid treatment device having a plurality of storage tanks and the above-mentioned pump, wherein at least one of the plurality of storage tanks stores a liquid and a catalyst or microorganism that generates gas by reacting with the liquid, the umbrella portion is disposed in the one storage tank, and the first flow path and the second flow path are disposed in the other storage tanks.

[0020] In this liquid treatment device, the storage tank in which the umbrella portion of the water lifter is disposed is different from the storage tank in which the first and second flow paths of the water lifter are disposed. Therefore, even if the storage tank in which the first and second flow paths are disposed does not contain the catalyst or microorganisms, the liquid in this storage tank can be discharged. Furthermore, because the liquid treatment device includes the water lifter, it can treat liquids at low cost.

[0021] The pump may further include a transfer flow path for transferring the liquid discharged from the discharge port to another storage tank. By providing the transfer flow path, the liquid in the storage tank can be transferred to the other storage tank.

[0022] The liquid treatment device may be a device that performs sewage treatment to purify sewage. That is, the liquid treatment device may be a sewage treatment device. When the liquid treatment device is a sewage treatment device, sewage can be purified at low cost.

[0023] The term "sewage treatment equipment" is a concept that includes septic tanks that treat domestic wastewater including human waste, sewage treatment equipment that treats urban sewage, sewage treatment equipment that treats medium- or small-scale domestic wastewater, and wastewater (wastewater) treatment equipment that treats industrial wastewater (wastewater) and domestic wastewater.

[0024] As an example, there are currently approximately 7.5 million septic tanks in operation in Japan (as of the end of 2018), and even the majority of these are small septic tanks, which are aerobic treatment type tanks equipped with 27W to 300W fans and operate continuously 24 hours a day.

[0025] One aspect of the present invention is a sewage treatment device that is not a conventional aerobic treatment type, but rather a sewage treatment device that makes it possible to circulate the treated liquid by utilizing the pressure of gas generated during the organic matter decomposition process, which is the core of purification technology that does not use any power.

[0026] [Details of the Mode for Carrying Out the Invention]

[0027] First Embodiment Hereinafter, a water pump according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the drawings are schematic diagrams for explaining the present invention, and the shapes of the actual components (components), their scales, etc. may differ.

[0028] [Storage tank] As shown in Fig. 1, the storage tank includes a pump 1 for pumping the stored liquid W above the water surface and discharging it. The storage tank 2 also holds a catalyst or microorganism (not shown) below the water surface. The catalyst or microorganism reacts with the liquid W to generate gas.

[0029] [Water pump] The water pump 1 includes an umbrella portion 9 that collects gas generated by the reaction of the catalyst or microorganism in the liquid W, a liquid inlet 31 below that introduces the liquid W, a gas supply port 32 above that supplies the gas collected by the umbrella portion 9 via a gas supply flow path 5, a first flow path 3 having a communication portion 33 in the middle, and a second flow path 4 that communicates with the first flow path 3 at the communication portion 33 and has a curved portion 41 that curves from downward to upward below the communication portion 33 and a discharge port 42 above the curved portion that discharges the liquid. Note that "below" refers to the normal direction of the liquid W side of the water surface of the liquid W stored in the storage tank 2, and "up" refers to the opposite direction.

[0030] The umbrella portion 9 is formed of a plate-like member and has a generally conical shape. The umbrella portion 9 is open at its bottom and top. The gas supply flow path 5 is connected to the top of the umbrella portion 9, and communicates between the umbrella portion 9 and the gas supply port 32 of the first flow path 3. The umbrella portion 9 takes in gas generated in the liquid W through the opening at its bottom. The gas taken in the umbrella portion 9 is supplied from the opening at its top through the gas supply flow path 5 into the first flow path 3.

[0031] The gas supply flow path 5, the first flow path 3, and the second flow path 4 are tubular members. The first flow path 3 and the second flow path 4 may be formed integrally, or may be formed separately and joined together. Each of the gas supply flow path 5, the first flow path 3, and the second flow path 4 may be formed by joining a plurality of tubular members together.

[0032] The first flow path 3 in this embodiment is formed in a substantially linear shape. The first flow path 3 is disposed so that one end is located within the liquid W and the other end is located outside the liquid W. The other end may be located within the liquid W. The first flow path 3 in this embodiment is disposed so that its axial direction is substantially perpendicular to the water surface of the liquid W. The one end (lower end) is a liquid inlet 31 for introducing the liquid W into the interior, and the other end (upper end) is a gas supply port 32 through which gas is supplied.

[0033] The second flow path 4 is connected to the first flow path 3 via a communication section 33 provided in the middle of the first flow path 3, and is in communication with the first flow path 3. The second flow path 4 has a curved section 41 that curves from downward to upward below the communication section 33. The second flow path 4 of this embodiment has an intermediate section 43 that connects the communication section 33 and the curved section 41. In this embodiment, the intermediate section 43 is disposed so that its axial direction is parallel to the water surface of the liquid W.

[0034] The curved portion 41 continues from the intermediate portion 43 and curves upward below the communicating portion 33. In this embodiment, the curved portion 41 is composed of a descending portion 41a that continues from the intermediate portion 43 and heads toward the bottom surface of the storage tank 2, and an ascending portion 41b that turns from the portion that heads toward the bottom surface and heads toward the water surface. In other words, the curved portion 41 is formed to be substantially U-shaped.

[0035] The second flow path 4 has a discharge port 42 that discharges the liquid W above the curved portion 41. In this embodiment, an extension portion 44 is connected to the curved portion 41 so that the discharge port 42 is located above the water surface of the liquid W, and the terminal end of this extension portion 44 serves as the discharge port 42. The extension portion 44 has a vertical portion 44a that continues from the curved portion 41 and extends approximately perpendicular to the water surface of the liquid W, and a horizontal portion 44b that continues from this vertical portion 44a and extends approximately parallel to the water surface of the liquid W, and the terminal end of this horizontal portion 44a serves as the discharge port 42.

[0036] When the pumping device 1 is disposed in the storage tank 1 storing the liquid W, the liquid W is introduced into the first flow path 3 and the second flow path 4 from the liquid inlet port 31. The liquid W is introduced until the water level in the storage tank 1 becomes the same as the water levels in the first flow path 3 and the second flow path 4. When the gas is supplied from the gas supply port 32 of the first flow path 3, the pressure of the gas decreases the water level of the liquid W in the first flow path 3 and increases the water level of the liquid W in the second flow path 4. In some cases, a portion of the liquid W in the second flow path 4 is discharged from the discharge port 42. When the gas is further supplied into the first flow path 3, the water level of the liquid W in the first flow path 3 further decreases and reaches the communicating portion 33, and a portion of the gas flows into the second flow path 4. When the gas is continuously supplied, the gas reaches the curved portion 41. When the gas passes through the curved portion 41, the balance between the pressure due to the liquid W that has been rising in the second flow path 4 and the pressure due to the supplied gas is broken, and the gas in the first flow path 3 flows into the second flow path 4 all at once. As a result, the liquid W in the second flow path 4 rises all at once and is discharged from the discharge port 42, and the liquid W in the storage tank 2 flows into the first flow path 3, and a portion of it is introduced into the second flow path 4. Furthermore, as the gas continues to be supplied into the first flow path 3, the liquid W introduced into the second flow path 4 is intermittently and repeatedly discharged.

[0037] The inner diameters of the gas supply flow path 5, the first flow path 3, and the second flow path 4 are not particularly limited and can be determined appropriately depending on the amount of gas to be generated, the amount of liquid W to be discharged, the interval (time) between discharges, etc. The inner diameters of the first flow path 3 and the second flow path 4 may be the same or different. The inner diameters of the first flow path 3 and the second flow path 4 may be formed to be constant or to be partially different. For example, the inner diameters of the intermediate portion 43, the curved portion 41, and the extended portion 44 of the second flow path 4 may be different from each other. The distance between the curved portion 41 and the surface of the liquid W is not particularly limited and can be determined appropriately depending on the amount to be discharged, the interval (time) between discharges, etc.

[0038] The size (capacity) and placement position (height) of the umbrella portion 9 are not particularly limited and can be determined appropriately depending on the amount of gas generated, the amount of liquid W ejected, the ejection interval (time), etc.

[0039] In this embodiment, a liquid supply pipe 6 is provided to supply the liquid W to the storage tank 2. By making the amount of the liquid W supplied from the liquid supply pipe 6 the same as the discharge amount of the liquid W discharged by the pump 1, the water level in the storage tank 2 can be kept constant.

[0040] 1, the discharge port 42 is provided on the outside of the storage tank 2 so as to discharge the liquid W out of the storage tank 2, but the discharge port 42 may be provided on the inside of the storage tank 2 so as to discharge the liquid W into the storage tank 2. In this way, the liquid W in the storage tank 2 can be circulated. Furthermore, by arranging the discharge port 42 above another storage tank (not shown), the liquid W in the storage tank 2 can be transferred to the other storage tank.

[0041] <Advantages> The water pump 1 can be produced at low cost because it is simply composed of the umbrella portion 9, the first flow path 3, and the second flow path 4. Furthermore, the water pump 1 discharges the liquid W by using gas generated from the liquid W in the storage tank 2 disposed therein, so no power source for discharging the liquid W is required, and the liquid W can be discharged at low cost.

[0042] [Second embodiment] Hereinafter, a liquid treatment device according to another embodiment of the present invention will be described. In this embodiment, the liquid treatment device will be described as a wastewater treatment device. Note that the same components as those in the first embodiment described above will be assigned the same reference numerals and will not be described again.

[0043] <Sewage treatment equipment> As shown in Figures 2, 3, and 4, the sewage treatment device 10 has multiple storage tanks (treatment tanks) for storing and treating liquid (sewage) W, and a pump 20. The sewage treatment device 10 includes a first treatment tank 11 that performs anaerobic treatment and solid-liquid separation, two intermediate treatment tanks 12 and 13 that perform anaerobically treating the sewage W treated in the first treatment tank 11, and a final treatment tank 14 that performs sedimentation separation on the sewage W treated in the intermediate treatment tanks 12 and 13. The first treatment tank 11 and the two intermediate treatment tanks 12 and 13 hold anaerobic microorganisms (not shown) for anaerobic treatment. The anaerobic microorganisms are supported on multiple carriers (not shown). The sewage treatment device 1 has an inlet 15 at the top of the first treatment tank 11 side through which the sewage W flows, and an outlet 16 at the top of the final treatment tank 14 side through which the treated sewage W flows out as treated water that complies with water quality standards.

[0044] The first treatment tank 11, the intermediate treatment tanks 12, 13, and the final treatment tank 14 are separated by partition walls 11a, 12a, and 13a within the sewage treatment device 1, and the sewage W passes through in this order. The partition wall 11a of the first treatment tank 11 and the partition wall 12a of the upstream intermediate treatment tank 12 are provided with flow paths 11b and 12b through which the sewage W passes, and openings 11c and 12c at the top. The partition wall 13a of the downstream intermediate treatment tank 13 is provided with an opening 13c at the bottom through which the sewage W passes.

[0045] The sewage treatment device 1 has an inspection hatch at the top, and the first treatment tank 11 and the intermediate treatment tanks 12 and 13 have upper and lower screens to prevent the carrier from floating up and settling, as well as backwashing air diffusers used during inspection, but the detailed configuration of these is omitted from the drawing.

[0046] A water pump 20 is disposed in the final treatment tank 14. The water pump 20 has a transfer flow path 7 that transfers the wastewater W discharged from the discharge port to the first treatment tank 11. The transfer flow path 7 is a tubular member. The transfer flow path 7 has a discharge port 71 that opens above the first treatment tank 11.

[0047] The sewage treatment device 10 of this embodiment has a gas supply flow path 8 that supplies gas to the first flow path 23, and an umbrella portion 29 that collects gas generated in the first treatment tank 11 and the intermediate treatment tanks 12, 13 and supplies this gas to the gas supply flow path 8. The gas supply flow path 8 is connected to the gas supply port of the first flow path 23, and communicates between the first flow path 23 and the umbrella portion 29. The umbrella portion 29 is disposed in the sewage W in the first treatment tank 11 and the intermediate treatment tanks 12, 13. The gas supply flow path 8 and the umbrella portion 29 are communicated via a connecting pipe 8a.

[0048] In this embodiment, the umbrella portion 29 is formed of a plate-like member and has a generally conical shape. The top and bottom of the umbrella portion 29 are open. The umbrella portion 29 is connected to the connecting pipe 8a at the top, and the generated gas is taken in at the bottom.

[0049] The sewage treatment device 10 treats sewage W using the anaerobic microorganisms in the first treatment tank 11 and intermediate treatment tanks 12 and 13. Gases containing methane and the like are generated during this treatment process. The umbrella portion 29 collects this gas. The gas is introduced into the gas supply flow path 8 from the opening at the top of the umbrella portion 29 via the connecting pipe 8a. The gas introduced into the gas supply flow path 8 is supplied into the first flow path 23 of the water lifter 1 provided in the final treatment tank 14.

[0050] Since the gas is continuously generated in the first treatment tank 11 and the intermediate treatment tanks 12, 13, the pressure of the gas increases in the gas supply flow path 8 and the first flow path 23. Due to the increase in the pressure of the gas in the first flow path 23, the level of the wastewater W in the first flow path 23 decreases, and the level of the wastewater W in the second flow path 24 increases. When the gas in the first flow path 23 reaches the curved portion 241 of the second flow path 24, the wastewater W in the second flow path 24 is discharged and transferred to the first treatment tank 11 via the transfer flow path 7.

[0051] <Advantages> The sewage treatment device 10 includes a pump 20, which allows the sewage W in the final treatment tank 14 to be easily returned to the first treatment tank 11. Furthermore, the sewage treatment device 1 includes a gas supply flow path 8 and an umbrella portion 29, which eliminates the need for a gas supply device for supplying gas to the first flow path 23, thereby reducing installation costs and running costs for sewage treatment.

[0052] [Other embodiments] The above-disclosed embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is not limited to the configurations of the above-disclosed embodiments, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0053] In the above-described water pump 1, the upper end of the first flow path 3 forms the gas supply port 32. However, as shown in Fig. 5, the gas supply port 115 of the water pump 110 may be formed on the side above the first flow path 113 by sealing the upper end of the first flow path 113. The upper end of the first flow path 113 may be located below the surface of the liquid W.

[0054] As shown in Figure 6, the curved portion 121 in the second flow path 124 of the water pump 120 may have a first straight portion 121a that slopes diagonally downward in a direction away from the first flow path 123, and a second straight portion 121b that is perpendicular to the first straight portion 121a and slopes diagonally upward.

[0055] Furthermore, the intermediate portion 43 of the water pump 1 does not necessarily need to be parallel to the water surface of the liquid W, and as shown in Figure 7, the intermediate portion 135 of the second flow path 134 may be inclined downward as it moves away from the communicating portion 131 of the first flow path 133 in the water pump 130, and may be provided so as to form part of the curved portion 132. In this case, the curved portion 132 does not need to have a descending portion that curves downward.

[0056] The first flow path does not need to be formed in a substantially straight line, and as shown in Figures 8 and 9, the first flow path 143, 153 in the water pump 140, 150 may have a bent portion 141, 151, and a communicating portion 142, 152 may be provided at this bent portion 141, 151.

[0057] Although the above-described wastewater treatment device has been described as not having a tank for aerobic treatment (aeration treatment), it may have a tank for aerobic treatment.

[0058] The sewage treatment device may have one or three or more intermediate treatment tanks, or may have no intermediate treatment tank. Furthermore, the sewage treatment device may have only one treatment tank.

[0059] The liquid treatment device is not limited to a wastewater treatment device that biologically treats wastewater, but may also be one that purifies industrial wastewater using a catalyst, for example.

[0060] The umbrella portion described above is formed from a plate-like material in an approximately conical shape, but the shape is not particularly limited as long as it can collect rising gas, and may be a triangular pyramid, a square pyramid, a polygonal pyramid, a hemisphere, etc.

[0061] The pump is not limited to use in storage tanks and sewage treatment equipment, but can also be used in water tanks, tanks, etc. in various industrial fields as long as they store liquids or store and treat liquids. [Industrial Applicability]

[0062] As described above, the pumping device of the present invention has a simple configuration, and can easily pump and discharge liquid from a storage tank at low cost. Therefore, it is suitable for use in various storage tanks that store liquid, particularly in sewage treatment devices. [Explanation of symbols]

[0063] 1,20,110,120,130,140,150 Water pump 2. Reservoir 3,23,113,123,133,143,153 First channel 31 Liquid inlet 32,115 Gas supply port 33,131,142,152 Communication part 4,24,124,134 Second flow path 41,121,132,241 curved part 41a Descending part 41b Ascending section 42 Discharge port 43,135 middle part 44 Extension part 44a Vertical section 44b horizontal part 5,8 Gas supply channel 6 Liquid supply pipe 7 Transfer channel 71 Outlet 8a connecting pipe 9,29 Umbrella section 10 Sewage treatment equipment 11 First treatment tank 12,13 Intermediate treatment tank 11a,12a,13a Bulkhead 11b, 12b flow path 11c,12c,13c opening 14 Final treatment tank 15 Inlet 16 Outlet 121a First straight section 121b Second straight section 141,151 Bent part W Liquid (sewage)

Claims

1. A water pump for pumping a liquid above the water surface and discharging it, an umbrella portion for collecting gas generated by the reaction of a catalyst or microorganism in the liquid; a first flow path having a liquid inlet port at the bottom for introducing the liquid, a gas supply port at the top for supplying the gas collected by the umbrella portion via a gas supply flow path, and a communication portion at the middle; a second flow path that communicates with the first flow path at the communication part, and has a curved part that curves from downward to upward below the communication part, and a discharge port that discharges the liquid above the curved part; Equipped with the umbrella portion is positioned below the curved portion in the liquid; The discharge port of the water pump opens above the water surface.

2. storing a liquid and a catalyst or microorganism that reacts with the liquid to generate a gas; A storage tank having the water lifter according to claim 1.

3. A liquid treatment device comprising a plurality of storage tanks for storing liquid and separated by partitions, and a pump for pumping the liquid above the water surface and discharging it, The pump is an umbrella portion for collecting gas generated by the reaction of a catalyst or microorganism in the liquid; a first flow path having a liquid inlet port at the bottom for introducing the liquid, a gas supply port at the top for supplying the gas collected by the umbrella portion via a gas supply flow path, and a communication portion at the middle; a second flow path that communicates with the first flow path at the communication part, and has a curved part that curves from downward to upward below the communication part, and a discharge port that discharges the liquid above the curved part; and At least one of the plurality of storage tanks has the catalyst or the microorganism and the umbrella portion, the first flow path and the second flow path are disposed in one of the other reservoirs; the umbrella portion is positioned below the curved portion in the liquid; A liquid treatment device further comprising a transfer flow path that transfers the liquid discharged from the discharge port by the water pump to a storage tank other than one of the other storage tanks and has an outlet that opens above the liquid in the storage tank.

4. 4. The liquid treatment device according to claim 3, wherein the device treats wastewater to purify the wastewater.

Images