Comprehensive purification system and method for lake water quality

Abstract

The invention relates to the technical field of lake ecological water environment treatment, and provides a lake water quality comprehensive purification system and method, sufficient microbubbles are generated in lake water, and a flocculating agent is adopted to rapidly polymerize suspended solids and lancea algae into floccules for floating, so that preliminary separation of pollutants is realized, and a good foundation is laid for subsequent treatment; meanwhile, the system adopts scum suction equipment, a scum transportation tank and a land transportation tank, so that efficient and stable recovery and continuous transfer of scum are realized; in the ashore treatment stage, scum is converted into biogas through anaerobic fermentation, and then the biogas is subjected to aerobic purification treatment, so that pollutants are effectively removed, energy recycling is promoted, and the method conforms to the green and environment-friendly concept; meanwhile, the tower-type aerobic biofilter is used for biodegrading dissolved organic matters, nitrogen, phosphorus and the like in the lake water and is matched with the water body oxygenation device to remarkably improve the content of dissolved oxygen in the water body, so that the ecological environment of the lake water is improved and the restoration of an ecological system is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of lake ecological water environment treatment, in particular to a comprehensive lake water purification system and method. Background Art

[0002] With the rapid economic development and the continuous advancement of urbanization, natural water bodies such as lakes are facing increasingly serious eutrophication problems. A large amount of suspended solids, algae blooms, dissolved organic matter (such as COD), nitrogen, phosphorus and other pollutants accumulate in lakes, leading to deterioration of water quality and destruction of ecological balance. The limitations of traditional lake water quality management are becoming increasingly apparent, specifically in the following aspects: In the existing technology, many methods only treat blue algae blooms on the water surface, which cannot form a balanced purification effect on the entire water body. It is difficult to completely improve the overall water quality and ecological environment of the water body by only removing surface pollutants; traditional algae removal equipment (such as algae removal boats) are usually designed as special equipment. For example, an early algae removal boat with a processing capacity of 25m³ / h was priced at more than 500,000 yuan, and required 3 to 4 operators to work together. The equipment investment was high and the operation and maintenance costs were high, which limited its promotion and application in large-scale lake management.

[0003] Based on this, the present invention proposes a comprehensive lake water purification system and method to achieve efficient and low-cost comprehensive treatment of suspended matter, blue algae blooms and soluble pollutants in lake water, while improving the dissolved oxygen level of the water body through oxygenation and supplementation, thereby promoting the rapid recovery of the water ecosystem. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and to provide a comprehensive lake water purification system and method to achieve efficient and low-cost comprehensive treatment of suspended matter, blue algae blooms and soluble pollutants in lake water, while improving the dissolved oxygen level in the water body by means of oxygenation and supplementation, thereby promoting the rapid recovery of the water ecosystem.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A comprehensive lake water purification system, including: pre-treatment flotation, scum suction equipment, scum transport tank, land transport tank; the pre-treatment flotation is provided with a distribution box, a dissolving medicine barrel, a medicine dosing barrel, a water diverter, a pressure pump, a flow meter, and a pressure dissolved gas tank in sequence; the pressure dissolved gas tank is provided with an air compressor and a first generator on both sides, and the left bottom of the pre-treatment flotation is provided with a first electric hanging paddle; the dissolving medicine barrel is connected to the medicine dosing barrel through a water pump, and the medicine dosing barrel is connected to the water diverter through a metering pump, and the water diverter, the pressure pump, the flow meter, the pressure dissolved gas tank ... The tanks are connected in sequence, the pressure dissolved gas tank is connected to the air compressor, and the output port of the pressure dissolved gas tank is connected to a plurality of dissolved gas releasers; the dissolved gas releasers are arranged at the bottom of the pre-treatment air flotation; the first generator is electrically connected to the distribution box, and the distribution box is electrically connected to the booster pump, the air compressor, the water diverter, the drug dissolving barrel, the drug dosing barrel and the first electric hanging paddle respectively; the water diverter introduces lake water through the water diversion pipe; the pre-treatment air flotation is used to generate microbubbles in the lake water, and promote the suspended matter and blue algae to combine with the microbubbles to form flocs floating on the surface of the lake water; The slag suction equipment comprises: a first slag storage tank, two first auxiliary floats respectively arranged on both sides of the first slag storage tank, a slag skimmer connected to the first slag storage tank through a slag suction pipe, adjustable floats arranged on both sides of the slag skimmer, a slag extractor and a second generator arranged on the top of the first slag storage tank, and a second electric paddle arranged at the bottom of the first slag storage tank, wherein the second generator is electrically connected to the slag extractor and the second electric paddle; the slag suction equipment is used to suck slag floating on the surface of the lake water; The scum transport tank is used to transfer the scum sucked out by the scum suction equipment to the shore; the land transport tank is used to transfer the scum in the scum transport tank to a scum centralized treatment site; Preferably, the comprehensive lake water purification system also includes a tower aerobic biofilter, which uses columnar activated carbon as a biological carrier and is equipped with a circulating water pump system for biodegrading soluble pollutants COD, nitrogen and phosphorus in lake water.

[0006] Preferably, the water oxygenation device is a submersible pump plus an ejector.

[0007] Preferably, the slag transport tank includes: a second slag storage tank, second auxiliary buoys respectively arranged on both sides of the second slag storage tank, a transfer port arranged on the top of the second slag storage tank, and a third paddle arranged at the bottom of the second slag storage tank, and the second slag storage tank is connected to the second auxiliary buoys by a fixed channel steel.

[0008] Preferably, the land transport tank comprises: a third slag storage tank, a mobile chassis arranged at the bottom of the third slag storage tank, a slag inlet arranged at the top of the third slag storage tank, and a slag outlet arranged at the right side of the third slag storage tank.

[0009] Preferably, the third propeller operation uses a gasoline engine propeller operation.

[0010] Another object of the present invention is to provide a lake water purification method, using the above-mentioned lake water comprehensive purification system, comprising the following steps: S1. Pretreatment: using pretreatment flotation, adding flocculants into the lake water, and generating microbubbles when adding the flocculants, so that the suspended matter and blue algae in the lake water combine with the microbubbles to form flocs and float to the water surface; S2, suction and transportation, using scum suction equipment to suck the scum formed in step S1 from the water surface into the first scum tank for storage, when the first scum tank is full, suck the scum in the first scum tank into the second scum tank through the scum transport tank, after being transported to the shore by the scum transport tank, suck the scum in the second scum tank into the third scum tank through the land transport tank, and transport it to the scum centralized treatment place; S3. Onshore treatment: The floating scum transported to the shore is dehydrated on-site or centrally treated. In the centralized treatment, the floating scum is added with human and animal feces and converted into biogas through anaerobic fermentation. The remaining water is then aerobically purified and discharged to meet the standards or returned to the lake. In the on-site dehydration treatment, the floating scum is dehydrated using a belt filter press or a spiral centrifuge.

[0011] Preferably, in step S1, the flocculant is dissolved by a dissolving barrel and a dosing barrel and supplied to a water diverter. After the lake water and the agent are introduced into the water diverter, the agent is pressurized by a pressure pump and enters a pressure dissolved air tank, and is finally released into the lake water through a dissolved air releaser.

[0012] Preferably, the dissolved air releaser is placed 1-2 m below the water surface.

[0013] The present invention discloses a comprehensive lake water purification system and method having the following beneficial effects.

[0014] The present invention realizes the preliminary separation of pollutants by generating sufficient microbubbles in the lake water and using flocculants to make suspended matter and blue algae quickly aggregate into flocs and float, thus laying a good foundation for subsequent treatment; at the same time, the system adopts scum suction equipment, scum transport tanks and land transport tanks to realize efficient, stable recovery and continuous transportation of scum; in the onshore treatment stage, the scum is converted into biogas through anaerobic fermentation and then aerobic purification treatment, which not only effectively removes pollutants but also promotes energy recovery and utilization, in line with the concept of green environmental protection; at the same time, the tower aerobic biological filter biodegrades soluble organic matter, nitrogen, phosphorus, etc. in the lake water, and cooperates with the water oxygenation device to significantly increase the dissolved oxygen content of the water, thereby improving the ecological environment of the lake water and promoting the repair and balance recovery of the ecosystem. It has significant advantages in treatment efficiency, purification effect, equipment structure, use cost and environmental protection benefits, and has broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1The present invention is a flow chart of the lake water purification method.

[0016] Figure 2 It is a schematic diagram of the top view of the pretreatment air flotation structure of the present invention.

[0017] Figure 3 for Figure 2 Schematic diagram of the cut structure at section AA.

[0018] Figure 4 It is a front view structural schematic diagram of the slag suction equipment of the present invention.

[0019] Figure 5 It is a schematic diagram of the side structure of the slag suction equipment of the present invention.

[0020] Figure 6 It is a front view structural schematic diagram of the slag transport tank of the present invention.

[0021] Figure 7 It is a schematic diagram of the side structure of the land transport tank of the present invention.

[0022] Figure 8 It is a schematic diagram of the adjustable float and skimmer structure of the present invention.

[0023] In the attached figure: 1. Pre-treatment flotation; 101. Dissolved air releaser; 102. Pressure dissolved air tank; 103. Flow meter; 104. Pressure pump; 105. Water diverter; 106. Dissolved medicine barrel; 107. Dosing barrel; 108. Distribution box; 109. Air compressor; 110. First generator; 111. First electric paddle; 112. Water diversion pipe; 113. Third auxiliary buoy; 2. Scum suction equipment; 201. First slag storage tank; 202. First auxiliary buoy; 203. Skimmer Slag trough; 204, adjustable buoy; 205, slag extraction pipe; 206, fixed rod; 207, slag extractor; 208, second electric paddle; 209, second generator; 210, connecting rod; 3, slag transport tank; 301, second slag storage tank; 302, second auxiliary buoy; 303, fixed channel steel; 304, transfer port; 305, third paddle; 4, land transport tank; 401, third slag storage tank; 402, mobile chassis; 403, slag inlet; 404, slag outlet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0026] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0027] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0028] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. Example 1

[0029] Please refer to Figure 2-Figure 8 A comprehensive lake water purification system comprises: a pre-treatment flotation 1, a scum suction device 2, a scum transport tank 3, and a land transport tank 4; Figure 2 and Figure 3As shown, above the pretreatment flotation 1, a distribution box 108, a drug dissolving barrel 106, a drug dosing barrel 107, a water diverter 105, a pressure pump 104, a flow meter 103, and a pressure dissolved gas tank 102 are arranged in sequence; air compressors 109 and a first generator 110 are arranged on both sides of the pressure dissolved gas tank 102, and a first electric hanging paddle 111 is arranged at the bottom of the left side of the pretreatment flotation 1; the drug dissolving barrel 106 and the drug dosing barrel 107 are respectively connected to the water diverter 105, and the water diverter 105, the pressure pump 104, the flow meter 103, and the pressure dissolved gas tank 102 are arranged on both sides of the pressure dissolved gas tank 102. The pump 104, the flow meter 103, and the pressure dissolved gas tank 102 are connected in sequence, the pressure dissolved gas tank 102 is connected to the air compressor 109, and the output port of the pressure dissolved gas tank 102 is connected to 5 dissolved gas releasers 101; the dissolved gas releasers 101 are arranged at the bottom of the pretreatment flotation 1; the first generator 110 is electrically connected to the distribution box 108, and the distribution box 108 is respectively connected to the pressure pump 104, the air compressor 109, the water diverter 105, the dissolved medicine barrel 106, the medicine feeding barrel 107 and The first electric paddle 111 is electrically connected; the water diverter introduces lake water through the water diversion pipe 112, and a filter screen is arranged at the front end of the water diversion pipe 112; the pretreatment flotation 1 is used to generate microbubbles in the lake water, and promote the flocculant, suspended matter and blue algae to combine with the microbubbles to form flocs floating on the surface of the lake water; the power of the first generator 110 is less than 10kw. When in use, the flocculant is first stirred and dissolved in the dissolving barrel 106 and the dosing barrel 107, and then introduced into the water diverter 105, and then the agent is mixed and pressurized by the pressure pump 104 and enters the pressure dissolved gas tank 102, and finally released into the lake water through the dissolved gas releaser 101 under reduced pressure, and microbubbles are generated while releasing the agent. Under the joint action of the microbubbles and the agent, the suspended matter and blue algae in the lake water are combined with the microbubbles to form flocs and float to the water surface. The pressure of the pressure pump 104 is 2-3kg. In order to increase the stability of the pretreatment flotation 1 on the water surface, a third auxiliary buoy 113 is arranged on both sides of the pretreatment flotation 1.

[0030] like Figure 4 and Figure 5As shown, the slag suction device 2 includes: a first slag storage tank 201, two first auxiliary buoys 202 respectively arranged on both sides of the first slag storage tank 201, a slag skimming tank 203 connected to the first slag storage tank 201 through a slag suction pipe 205, adjustable buoys 204 arranged on both sides of the slag skimming tank 203, a slag extractor 207 and a second generator 209 arranged on the top of the first slag storage tank 201, and a second electric paddle 208 arranged at the bottom of the first slag storage tank 201, the second generator 209 is electrically connected to the slag extractor 207 and the second electric paddle 208, and the second electric paddle 208 is arranged at the bottom of the first slag storage tank 201; the first slag storage tank 201 is connected to the first auxiliary buoys 202 on both sides by a fixing rod 206; as a preferred embodiment, a connecting rod 210 is provided on the slag skimming tank 203, and one end of the connecting rod 210 is hinged to the slag skimming tank 203, and the other end is hinged to the fixing rod 206. The height of the skimmer 203 is controlled by controlling the amount of water in the adjustable float 204. The adjustable float 204 allows the skimmer 203 to only extract the scum layer <30 mm on the lake surface. Please refer to Figure 8 The scum suction device 2 is used to suck the scum floating on the surface of the lake water; the scum suction device 2 can also remove the first auxiliary buoy 202 and be placed on the shore for independent use.

[0031] The scum transport tank 3 is used to transfer the scum extracted by the scum suction device 2 to the shore; the land transport tank 4 is used to transfer the scum in the scum transport tank 3 to a scum centralized treatment site. The lake water comprehensive purification system of the present invention only requires 4 people to carry out lake water purification work, specifically, one person each operates the pre-treatment flotation 1, the scum suction device 2, the scum transport tank 3, and the land transport tank 4, saving human resources.

[0032] Preferably, in the present embodiment, the tower aerobic biofilter uses columnar activated carbon as a biological carrier and is equipped with a circulating water pump system for biodegrading soluble pollutants COD, nitrogen and phosphorus in lake water. The tower aerobic biofilter is equipped with 9 tons of columnar activated carbon and the water pump runs intermittently. In the present embodiment, the water pump runs automatically and intermittently for 15 hours a day and can process 750 cubic meters of water.

[0033] Preferably, in this embodiment, the water oxygenation device is a submersible pump plus an ejector.

[0034] Preferably, in this embodiment, at least two independent water storage chambers are provided in the adjustable float 204, and the height at which the adjustable float 204 floats above the water surface is controlled by filling water in different water storage chambers, thereby controlling the relative height between the skimmer 203 and the lake water surface.

[0035] like Figure 6As shown, preferably, in this embodiment, the slag transport tank 3 includes: a second slag storage tank 301, second auxiliary buoys 302 respectively arranged on both sides of the second slag storage tank 301, a transfer port 304 arranged on the top of the second slag storage tank 301, and a third paddle 305 arranged at the bottom of the second slag storage tank 301. The second slag storage tank 301 is connected to the second auxiliary buoy 302 by a fixed channel steel 303.

[0036] like Figure 7 As shown, preferably, in this embodiment, the land transport tank 4 includes: a third slag storage tank 401, a mobile chassis 402 arranged at the bottom of the third slag storage tank 401, a slag inlet 403 arranged at the top of the third slag storage tank 401, and a slag outlet 404 arranged on the right side of the third slag storage tank 401.

[0037] Preferably, in this embodiment, the third propeller 305 uses a gasoline engine propeller.

[0038] The lake water comprehensive purification system used in the present invention has equipment for lake surface use, has low cost, and except for general equipment, the rest can be manufactured on site. The whole set costs only 200,000 yuan, and has particularly good economic benefits. Example 2

[0039] Based on Example 1, please refer to Figure 1 This embodiment provides a lake water purification method, using the lake water comprehensive purification system in embodiment 1, including the following steps: S1, pretreatment, using pretreatment flotation 1, adding flocculants into the lake water, and generating microbubbles when the flocculants are added, so that the suspended matter and blue algae in the lake water are combined with the microbubbles to form flocs and float to the water surface; S2, suction and transportation, using the scum suction device 2 to suck the scum formed in step S1 from the water surface into the first scum tank 201 for storage, when the first scum tank 201 is full, the scum in the first scum tank 201 is sucked into the second scum tank 301 through the scum transport tank 3, after being transported to the shore by the scum transport tank 3, the scum in the second scum tank 301 is sucked into the third scum tank 401 through the land transport tank 4, and transported to the scum centralized treatment place; S3. Onshore treatment: The floating scum transported to the shore is dehydrated on-site or centrally treated. The centralized treatment is to add human and animal feces to the floating scum and convert it into biogas through anaerobic fermentation. The remaining water is then aerobically purified and discharged to meet the standards or returned to the lake. The on-site dehydration treatment is to dehydrate the floating scum using a belt filter press or a spiral centrifuge. The on-site dehydration treatment is suitable for small batches of floating scum.

[0040] Preferably, in step S1 of the present embodiment, the flocculant is dissolved by the drug dissolving barrel 106 and the drug dosing barrel 107 and supplied to the water diverter 105. The drug is pressurized by the pressure pump 104 and then enters the pressure dissolved gas tank 102, and is finally released into the lake water through the dissolved gas releaser 101. In the present embodiment, polyaluminum chloride is used as the flocculant, and the amount of polyaluminum chloride used for 1 cubic meter of sewage is 0.05 kg. In actual use, the amount of polyaluminum chloride can be adjusted according to the actual sewage quality.

[0041] Preferably, in this embodiment, the dissolved air releaser 101 is placed 1-2 m below the water surface.

[0042] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be a substitution of a part of the structure, device, method step, or a complete technical solution. The equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A comprehensive lake water purification system, characterized in that: include: Pretreatment flotation, scum suction equipment, scum transport tank, land transport tank; above the pretreatment flotation are arranged a distribution box, a dissolving medicine barrel, a medicine-dosing barrel, a water diverter, a pressure pump, a flow meter, and a pressure dissolved air tank in sequence; air compressors and the first generator are respectively arranged on both sides of the pressure dissolved air tank, and a first electric hanging paddle is arranged at the bottom left of the pretreatment flotation; the dissolving medicine barrel is connected to the medicine-dosing barrel through a water pump, and the medicine-dosing barrel is connected to the water diverter through a metering pump, and the water diverter, the pressure dissolved air tank, the pressure pump, the flow meter, and the pressure dissolved air tank are connected in sequence, and the pressure dissolved air tank is connected to the air compressor, and the output port of the pressure dissolved air tank is connected to a number of dissolved air releasers; the dissolved air releaser is arranged at the bottom of the pretreatment flotation; the first generator is electrically connected to the distribution box, and the distribution box is electrically connected to the pressure pump, the air compressor, the water diverter, the dissolving medicine barrel, the medicine-dosing barrel and the first electric hanging paddle respectively; the water diverter introduces lake water through a water diversion pipe; The pre-treatment flotation is used to generate microbubbles in the lake water, and to promote the suspended matter and blue algae to combine with the microbubbles to form flocs that float on the surface of the lake water; The slag suction equipment comprises: a first slag storage tank, two first auxiliary floats respectively arranged on both sides of the first slag storage tank, a slag skimmer connected to the first slag storage tank through a slag suction pipe, adjustable floats arranged on both sides of the slag skimmer, a slag extractor and a second generator arranged on the top of the first slag storage tank, and a second electric paddle arranged at the bottom of the first slag storage tank, wherein the second generator is electrically connected to the slag extractor and the second electric paddle; the slag suction equipment is used to suck slag floating on the surface of the lake water; The scum transport tank is used to transfer the scum sucked out by the scum suction equipment to the shore; the land transport tank is used to transfer the scum in the scum transport tank to a scum centralized treatment site.

2. The lake water comprehensive purification system according to claim 1, characterized in that: Also includes: The tower aerobic biofilter uses columnar activated carbon as a biological carrier and is equipped with a circulating water pump system for biodegrading soluble pollutants COD, nitrogen and phosphorus in lake water.

3. The lake water comprehensive purification system according to claim 1, characterized in that: The water oxygenation device is a submersible pump plus an ejector.

4. The lake water comprehensive purification system according to claim 1, characterized in that: The slag transport tank includes: a second slag storage tank, second auxiliary buoys respectively arranged on both sides of the second slag storage tank, a transfer port arranged on the top of the second slag storage tank, and a third paddle arranged at the bottom of the second slag storage tank. The second slag storage tank is connected to the second auxiliary buoys by a fixed channel steel.

5. The lake water comprehensive purification system according to claim 1, characterized in that: The land transport tank comprises: a third slag storage tank, a mobile chassis arranged at the bottom of the third slag storage tank, a slag inlet arranged at the top of the third slag storage tank, and a slag outlet arranged at the right side of the third slag storage tank.

6. The lake water comprehensive purification system according to claim 4, characterized in that: The third propeller operation uses a gasoline engine to operate the propeller.

7. A lake water purification method, using the lake water comprehensive purification system according to any one of claims 1 to 6, characterized in that: The steps include: S1. Pretreatment: using pretreatment flotation, adding flocculants into the lake water, and generating microbubbles when adding the flocculants, so that the suspended matter and blue algae in the lake water combine with the microbubbles to form flocs and float to the water surface; S2, suction and transportation, using scum suction equipment to suck the scum formed in step S1 from the water surface into the first scum tank for storage, when the first scum tank is full, suck the scum in the first scum tank into the second scum tank through the scum transport tank, after being transported to the shore by the scum transport tank, suck the scum in the second scum tank into the third scum tank through the land transport tank, and transport it to the scum centralized treatment place; S3. Onshore treatment: The floating scum transported to the shore is dehydrated on-site or centrally treated. In the centralized treatment, the floating scum is added with human and animal feces and converted into biogas through anaerobic fermentation. The remaining water is then aerobically purified and discharged to meet the standards or returned to the lake. In the on-site dehydration treatment, the floating scum is dehydrated using a belt filter press or a spiral centrifuge.

8. The lake water purification method according to claim 7, characterized in that: In step S1, the flocculant is dissolved by the dissolving barrel and the dosing barrel and supplied to the water diverter. After the lake water and the agent are introduced into the water diverter, the agent is pressurized by the booster pump and enters the pressure dissolved air tank, and is finally released into the lake water through the dissolved air releaser.

9. The lake water purification method according to claim 7, characterized in that: The dissolved air releaser is placed 1-2m below the water surface.

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