CN118005207A - Blue algae stabilization treatment system and treatment process thereof - Google Patents
Blue algae stabilization treatment system and treatment process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
- E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
- E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
- E02B15/08—Devices for reducing the polluted area with or without additional devices for removing the material
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- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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Abstract
The invention discloses a blue algae stabilization treatment system and a treatment process thereof, which relate to the field of river and lake water environment blue algae treatment and comprise a blue algae raw water regulation and storage tank, a blue algae collecting system, a blue algae bath water separation system, a disinfection system and an algae residue treatment system, wherein the blue algae collecting system is used for collecting blue algae, the blue algae bath water separation system is used for separating blue algae water, the algae residue treatment system is used for dewatering algae residues, and the disinfection system is used for disinfecting effluent water precipitated by an ABR baffling slow sedimentation tank; the process system adopts a combined process technology of grading and sectional type, collects, detects, analyzes and processes blue algae in lakes, has high processing efficiency, stable effect, low energy consumption for blue algae processing, no secondary pollution in the processing process, performs anaerobic fermentation utilization of blue algae residues, and provides high-quality raw materials for organic fertilizer production, so that the algae residues are recycled, and the process system has long-term stable technical guarantee and market prospect.
Description
Technical Field
The invention mainly relates to the technical field of blue algae treatment in river and lake water environments, in particular to a blue algae stabilization treatment system and a treatment process thereof.
Background
Along with the social development of frequent human activities, the diversification of pollutants and the increase of nitrogen and phosphorus sources cause the eutrophication of water bodies to become an important problem of lake water environment pollution in China, and the blue algae burst phenomenon in more and more water areas occurs, once the blue algae are propagated in a large scale, the physicochemical property of the water bodies and the water ecological environment are seriously influenced, so that the water body pollution is caused, and more seriously, the blue algae can release a large amount of blue algae toxins in the propagation process, and the blue algae toxins can harm the health of human bodies through different ways such as oral ingestion, lung respiration, skin contact, blood permeation and the like. Therefore, how to treat blue algae in a water body by adopting an appropriate mode according to local conditions has become a focus of attention in the field of environmental protection in recent years.
At present, domestic blue algae treatment methods mainly comprise four types of physical methods, chemical methods, biological methods and comprehensive treatment methods. The existing physical method can be summarized into filtration, precipitation, separation and the like, and the method has the defects of low filtration efficiency, low precipitation speed, small application range and the like. The chemical method can be generalized into an advanced oxidation method, a flocculation sedimentation method and the like, and the method has high treatment energy consumption and high medicament cost, and substances participating in the chemical reaction can also form oxidation byproducts (such as carcinogenic, teratogenic, mutagenic products and the like of chloroform and the like) which are easy to cause secondary pollution to the water body. The biological method controls the growth of blue algae in the water body from the ecological perspective through the ecological principles of nutrition competition among organisms, food chains, food nets and the like, and has the problems of long treatment period, unstable treatment effect and the like. Therefore, the treatment effect of blue algae in the water body by adopting a single method is often not ideal.
The comprehensive method combines two or three treatment methods of a physical method, a chemical method and a biological method, and carries out blue algae treatment through a staged and graded treatment thought. At present, the commonly adopted comprehensive treatment methods include a combined pressurization-mechanical separation process, a combined coagulation-air floatation process, an ozone-air floatation combined process, an ozone activated carbon advanced treatment process and the like. The method has the effect obviously superior to that of a single method for removing blue algae in a water body, however, the direct pressurization treatment of the raw water of the algae water can cause the insignificant pressurization effect due to the low blue algae content in the inlet water, and a large amount of energy consumption can be generated in the pressurization process. The conventional air flotation bubbles have larger diameter, limited flotation effect and limited surface load, and the effluent still contains a large amount of blue algae larvae, algae toxins and the like. Ozone is used as a strengthening means for blue algae treatment, and is limited by water yield to realize the strong oxidation treatment effect on blue algae in polluted water. The ultra-high power ozone generator set needs to be configured, the energy consumption is relatively high, and the influence of the fluctuation of the blue algae concentration in the water body is large. The activated carbon is used as a blue algae advanced treatment unit, the regeneration process of the activated carbon after the activated carbon is saturated by adsorption consumes high filter material replacement cost, and the reasonable disposal of the regenerated activated carbon waste residue still has the problem of larger environmental pollution.
In order to solve the problems of low treatment efficiency, unstable effect, high energy consumption of blue algae treatment, easy generation of secondary pollution sources in the treatment process, low blue algae toxin content risk, resource utilization of blue algae dewatered sludge and the like which are commonly existed in the existing blue algae treatment technology, the system and the method for treating blue algae are provided to solve the problems.
Disclosure of Invention
Based on the above, the present invention aims to provide a blue algae stabilization treatment system and a treatment process thereof, so as to solve the technical problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The blue algae stabilization treatment system comprises a blue algae raw water regulation and storage tank, a blue algae collecting system, a blue algae bath water separation system, a disinfection system and an algae residue treatment system, wherein the blue algae collecting system comprises a blue algae collecting floating island cofferdam, a conveying connecting pipeline and a lifting pump, the blue algae collecting floating island cofferdam is arranged in a funnel-shaped structure with a wide upper part and a narrow lower part, the blue algae collecting floating island cofferdam comprises a foaming buoy and a light aluminum alloy plate, the foaming buoy surrounds a blue algae collecting area, the light aluminum alloy plate is positioned at the bottom of the foaming buoy, the connection parts among the light aluminum alloy plates are connected through rubber gaskets, an inlet at one end of the conveying connecting pipeline is communicated with the bottom of the blue algae collecting floating island cofferdam, an inlet of the lifting pump is communicated with an outlet of the conveying connecting pipeline, and an outlet of the lifting pump is connected with the blue algae regulating and storage tank.
According to the technical scheme, a blue algae concentration measuring instrument is arranged on the surface of a blue algae water body in the blue algae collecting floating island cofferdam, the blue algae concentration measuring instrument is connected with a PLC (programmable logic controller) through infinite transmission, and the PLC is electrically connected with the lifting pump through a wire.
The blue algae bath water separation system comprises a blue algae water separation device, wherein the blue algae water separation device comprises a first coagulation mixer, a first coagulation reaction chamber, a first dissolved air release chamber, a first slag scraping machine, a first-stage air floatation tank, a first scum collecting tank, a first algae slag discharge port, a second coagulation mixer, a second coagulation reaction chamber, a second dissolved air release chamber, a second slag scraping machine, a second-stage air floatation tank, a second scum collecting tank, a second algae slag discharge port, an algae slag tank, an ABR baffling slow sedimentation tank and a clear water backflow chamber, the first coagulation mixer, the first coagulation reaction chamber, the first dissolved air release chamber, the first slag scraping machine, the first slag collecting tank, the second coagulation mixer, the second coagulation reaction chamber, the second dissolved air release chamber, the second slag scraping machine, the second-stage air floatation tank, the second slag collecting tank, the ABR baffling slow sedimentation tank and the backflow chamber are sequentially arranged, the first algae slag discharge port is positioned at the bottom of the first scum discharge port, the first scum collecting tank is connected with the second scum discharge port, and the algae slag is connected with the second scum discharge port.
The technical scheme is that the clear water backflow cabin is connected with a first dissolved air water tank through a first pipeline, a first booster pump is arranged on the first dissolved air water tank, and a water outlet of the first booster pump is connected with a second dissolved air release cabin through a pipeline.
The clean water backflow cabin is connected with a second dissolved air water tank through a second pipeline, a second booster pump is arranged on the second dissolved air water tank, and a water outlet of the second booster pump is connected with the first dissolved air release cabin through a pipeline.
The technical scheme is that the first dissolved air water tank is connected with the second dissolved air water tank through a conveying pipeline, a pressure air storage tank is connected to the conveying pipeline between the first dissolved air water tank and the second dissolved air water tank, and the pressure air storage tank is connected with a turbine air compressor.
The disinfection system comprises an ozone generating device, wherein the ozone generating device comprises an oxygen generator, an oxygen storage tank, a primary air filter, a freeze dryer, a secondary air filter, an ozone generator and an ozone contact oxidation tower, the oxygen generator is connected with the oxygen storage tank through a pipeline, an oxygen storage tank air outlet is connected with a primary air filter air inlet, a primary air filter air outlet is connected with a freeze dryer air inlet, a freeze dryer air outlet is connected with a secondary air filter air inlet, a secondary air filter air outlet is connected with an ozone generator air inlet, an ozone generator air outlet is connected with the ozone contact oxidation tower through a pipeline, a water outlet is formed in one side of the top of the ozone contact oxidation tower, and a water inlet is formed in one side of the bottom of the ozone contact oxidation tower.
According to the technical scheme, the algae residue treatment system comprises a spiral shell stacking dehydrator and an algae residue anaerobic fermentation tank, wherein the spiral shell stacking dehydrator is connected with the algae residue tank, a residue discharging port of the spiral shell stacking dehydrator is connected with the algae residue anaerobic fermentation tank, and a filtrate port of the spiral shell stacking dehydrator is connected with the blue algae raw water regulating and storing tank through a pipeline.
According to the technical scheme, the blue algae raw water regulation and storage tank is connected with a first coagulation mixer inlet of the blue algae water separation device through a lifting pump.
According to the blue algae stabilization treatment system, a blue algae stabilization treatment process is provided, which comprises the following steps:
Firstly, blue algae collection, namely collecting blue algae in river and lake water bodies into a cofferdam through a blue algae collection floating island cofferdam so as to improve the concentration of the blue algae in the cofferdam;
Step two, algae water is conveyed, algae water collected in the blue algae collecting floating island cofferdam is conveyed to a blue algae raw water regulation and storage pool through an algae water lifting pump, and a blue algae concentration measuring instrument is connected with a PLC (programmable logic controller) through infinite transmission and is electrically connected with the lifting pump through a wire;
Step three, blue algae and algae are separated, blue algae in a blue algae raw water regulating and accumulating pond enters a blue algae and algae water separating device through an algae water lifting pump to carry out algae removal treatment, flocculant and coagulant aid with a certain content ratio are required to be added at the positions of a first coagulation stirrer and a second coagulation stirrer, a large amount of alum flocs are formed by the medicament and blue algae in raw water under the combined action of the flocculant and the coagulant aid and float on the surface of an air floatation pond, the blue algae and algae residues solid phase and liquid phase can be fully stripped under the action of a first slag scraper and a second slag scraper, part of blue algae suspended in water is further removed after being air-floated by the first air floatation pond and the second air floatation pond, the algae residues floating on the surface of the air floatation pond are directionally scraped to a first scum collecting groove under the action of the first slag scraper, the algae residues floating on the surface of the air floatation pond are directionally scraped to the second scum collecting groove under the action of the second slag scraper, and directly enter the air floatation pond from the second slag groove along the second slag groove to flow into a water tank through a first water tank, and a water-dissolving-out part of the water pump after being separated from the second water tank, and the water tank flows into a water tank to be respectively dissolved out through a water tank, and a water tank is separated into a water tank through a water tank;
Step four, algae residue dehydration treatment, namely, dehydration treatment is carried out on the algae residue through a conch dehydrator, algae slurry water generated by dehydration flows back to a blue algae raw water regulation and storage tank, and the generated semi-dry algae mud is conveyed to an algae residue anaerobic fermentation tank for anaerobic fermentation and then is conveyed to an organic fertilizer manufacturer;
And fifthly, sterilizing, namely sterilizing the effluent precipitated by the ABR baffling slow sedimentation tank by using an ozone generating device, and fully mixing and fully reacting the ozone contact oxidation tower with the effluent of the blue algae-algae separation system to eliminate blue algae and algae toxins with lower content in the effluent and kill blue algae larvae and pathogenic microorganisms in the water.
In summary, the invention has the following advantages:
The process system adopts a combined process technology of grading and sectional type, the blue algae in the lake is collected, detected, analyzed and treated, the treatment efficiency is high, the effect is stable, the treatment energy consumption of the blue algae is low, no secondary pollution is caused in the treatment process, the blue algae residue is subjected to anaerobic fermentation and utilized, and high-quality raw materials are provided for the production of organic fertilizer, so that the algae residue is recycled, and the long-term stable technical guarantee and market prospect are realized;
The blue algae in the lake is collected in a cofferdam, the concentration of the blue algae in the blue algae collection floating island cofferdam is detected on line in real time, the algae concentration data in the cofferdam is effectively analyzed through a PLC control system, the start-stop state of the algae water lifting pump is automatically controlled, the situation that the system operation energy consumption is too high due to frequent starting of the lifting pump caused by the too low concentration of the blue algae in the cofferdam can be avoided to the maximum extent, the algae concentration processed by single operation is lifted, the mixed water quantity in the algae water is reduced, and the operation load of a subsequent system is further reduced, so that the blue algae processing effect is more thorough, a large amount of system operation power cost can be saved, and a large amount of medicament cost can be saved;
The ozone generating device is used for disinfecting the effluent precipitated by the ABR baffling slow sedimentation tank, the ozone contact oxidation tower is fully mixed with and fully reacts with the effluent of the blue algae-water separation system to generate ozone molecules with higher concentration, the generated ozone is continuously conveyed to the ozone contact oxidation tower under the action of the ozone generator, the ozone is fully mixed with and fully reacts with the effluent of the blue algae-water separation system to eliminate blue algae and algae toxins with lower content in the effluent, in addition, the solubility of O 3 molecules is higher than that of O 2, by adopting the mode, blue algae larvae and pathogenic microorganisms in water can be killed, the dissolved oxygen content of the discharged water can be further improved, the eutrophication of the water can be effectively restrained, the final purification of the river and lake blue algae water is finally realized, and meanwhile, once the effluent contains trace algae toxins, the algae toxins can be catalyzed and oxidized by the strong oxidizing property of the ozone, and the stability of the effluent can be further ensured;
The dehydrated blue algae residue is subjected to anaerobic fermentation, so that macromolecular organic matters are degraded into micromolecular low-grade organic acids, and high-quality raw materials are provided for organic fertilizer production, so that the algae residue can be utilized as resources, and the algae residue cannot be replaced in a short period of other existing blue algae raw water treatment systems and methods, and the popularization and application of the technology have long-term stable technical guarantee and market prospect.
Drawings
FIG. 1 is a schematic diagram of a blue algae collecting floating island cofferdam structure of the present invention;
FIG. 2 is a flow chart for connecting a blue algae collecting floating island cofferdam and a blue algae raw water regulation and storage pool;
FIG. 3 is a flow chart of a blue algae stabilization treatment process of the present invention;
FIG. 4 is a schematic diagram of the operation of the cyanobacteria-algae-water separation system of the present invention;
Fig. 5 is a diagram of a pipeline connection system of the ozone sterilization device of the present invention.
Description of the drawings: 100. blue algae collecting floating island cofferdam; 110. a delivery connection pipe; 120. a lift pump; 1. a first coagulation mixer; 2. a first coagulation reaction chamber; 3. a first dissolved air delivery compartment; 4. a first slag scraper; 5. a primary air floatation tank; 6. a first dross collection receptacle; 7. a first algae residue discharge port; 8. a second coagulation mixer; 9. a second coagulation reaction chamber; 10. a second dissolved air release compartment; 11. a second slag scraper; 12. a secondary air floatation tank; 13. a second dross collection groove; 14. a second algae residue discharge port; 15. an algae residue pond; 16. ABR baffling slow sedimentation tank; 17. a clear water backflow cabin; 19. a pressure air storage tank; 18. a turbine air compressor; 20. a second dissolved air water tank; 21. a second booster pump; 22. a first dissolved air water tank; 23. a first booster pump; 30. an oxygenerator; 31. an oxygen storage tank; 32. a primary air filter; 33. a freeze dryer; 34. a secondary air filter; 35. an ozone generator; 36. ozone contacts the oxidation tower.
Description of the embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
Examples
The devices in the document of the application are all of the conventional type in the prior art, the control mode is automatic control through a PLC controller, the control circuit of the PLC controller can be realized through simple programming by a person skilled in the art, and the control method belongs to common general knowledge in the art and is not described in detail herein.
Referring to fig. 1,2 and 3, a blue algae stabilization treatment system comprises a blue algae raw water regulation and storage tank, a blue algae collecting system, a blue algae bath water separation system, a disinfection system and an algae residue treatment system, wherein the blue algae collecting system comprises a blue algae collecting floating island cofferdam 100, a conveying connecting pipeline 110 and a lifting pump 120, the blue algae collecting floating island cofferdam 100 is arranged in a funnel-shaped structure with a wide upper part and a narrow lower part, the blue algae collecting floating island cofferdam 100 comprises a foaming buoy and a light aluminum alloy plate, the foaming buoy surrounds a blue algae collecting area, the light aluminum alloy plate is positioned at the bottom of the foaming buoy, the connection parts among the light aluminum alloy plates are connected through rubber gaskets, an inlet at one end of the conveying connecting pipeline 110 is communicated with the bottom of the blue algae collecting floating island 100, an inlet of the lifting pump 120 is communicated with an outlet of the conveying connecting pipeline 110, and an outlet of the lifting pump 120 is connected with the blue algae raw water regulation and storage tank; the blue algae concentration measuring instrument is arranged on the surface of the blue algae water body in the blue algae collecting floating island cofferdam 100, and is connected with the PLC controller through infinite transmission, and the PLC controller is electrically connected with the lifting pump 120 through a wire.
In the embodiment, the blue algae collecting floating island cofferdam 100 is formed by using a suspended foaming buoy and a light alloy plate to form a floating island cofferdam with a funnel-shaped structure with wide upper part and narrow lower part, the water weir mouth part is a high-strength foaming buoy, the height of the water surface part is 200 mm-300 mm, the water surface part is subjected to up-down floating adjustment through adjusting equipment along with the water level change condition of a river and a lake, when the water surface part is downwards adjusted, the weir mouth part is slightly lower than the water level line of the river and the lake below the liquid level, the blue algae containing algae water is ensured to enter the cofferdam through self-flowing, the connection parts of the light aluminum alloy plates are connected through rubber gaskets, the underwater submerged depth of the light aluminum alloy plates is 1000 mm-1200 mm, and the connection mode of the rubber gaskets has good elasticity and sealing performance, so that the possibility of escape of the blue algae under the condition of high storm is effectively avoided, and noise is reduced;
Further, an inlet at one end of the conveying connecting pipeline 110 is communicated with the bottom of the blue algae collecting floating island cofferdam 100, an inlet of the lifting pump 120 is communicated with an outlet of the conveying connecting pipeline 110, an outlet of the lifting pump 120 is connected with a blue algae raw water regulation and storage tank, a shallow submerged suction pump is adopted as the algae water lifting pump 120, and the algae water lifting pump is provided with a blue algae concentration tester, the tester is directly connected with a system central control platform PLC control system, when the algae concentration tester is lower than a set value, the algae water lifting pump 120 is in a standby state and does not lift low-concentration algae water, when the algae concentration tester is higher than the set value, the algae water lifting pump 120 is automatically started and conveyed to a rear-section system, and in the running process of the whole system, the starting and stopping of the algae water lifting pump 120 is used as an execution instruction of running/stopping the whole system, the problem of over high energy consumption of running of the whole system caused by frequent starting and stopping of the whole system when the content of a water inlet end is lower can be effectively reduced, and the running of the whole system can be further realized;
The algae concentration measuring instrument is usually arranged on the surface of a water body, such as the interior of a cofferdam, so as to monitor the growth and propagation conditions of algae in real time, meanwhile, the equipment can transmit data to an upper computer such as a programmable logic controller PLC (programmable logic controller) through wireless communication technologies such as GPRS (general packet radio service), loRa (global positioning system) and the like so as to analyze and process the data, the PLC receives the real-time data from the algae concentration measuring instrument and controls the operation of the lifting pump 120 according to the requirement, the PLC communicates with the lifting pump 120 through wired modes such as RS485, profibus and the like, so that the accurate control of parameters such as start-stop and rotation speed of the pump is realized, the real-time performance and accuracy of data transmission and instruction execution of the algae concentration measuring instrument and the lifting pump 120 are ensured, the algae collecting and treating process is facilitated, the problem that the system operation energy consumption is excessively high due to frequent start-stop of the lower water inlet end content is effectively reduced, and the low-consumption and high-efficiency operation of the whole system operation can be further realized;
further, blue algae in the lake is subjected to cofferdam collection, the concentration of blue algae in the blue algae collection floating island cofferdam 100 is subjected to real-time online detection, the algae concentration data in the cofferdam is effectively analyzed through a PLC control system, the start-stop state of the algae water lifting pump 120 is automatically controlled, the situation that the system operation energy consumption is too high due to frequent starting of the lifting pump 120 caused by too low concentration of the blue algae in the cofferdam can be avoided to the maximum extent, the algae concentration of single operation treatment is promoted, the mixed water amount in the algae water is reduced, and the operation load of a subsequent system is further reduced, so that the blue algae treatment effect is more thorough, a large amount of system operation power cost can be saved, and a large amount of medicament cost can be saved;
Further, when the algae water lifting pump 120 is normally started, the algae raw water regulating reservoir is used for preliminarily regulating the algae in the incoming water, so that the algae content in the incoming water can be equalized, the stability of the algae content in the incoming water is ensured as much as possible, and further the algae raw water regulating reservoir is stably matched with the reagent quantitatively fed by the rear-stage flocculant and coagulant aid feeding system and the algae water mixture, so that the effects of flocculating and coagulant aid of the reagent are exerted to the greatest extent.
Referring to fig. 3,4 and 5, the blue algae bath water separation system comprises a blue algae water separation device, wherein the blue algae water separation device comprises a first coagulation mixer 1, a first coagulation reaction chamber 2, a first dissolved air release chamber 3, a first slag scraping machine 4, a first-stage air floatation tank 5, a first scum collecting tank 6, a first scum discharge port 7, a second coagulation mixer 8, a second coagulation reaction chamber 9, a second dissolved air release chamber 10, a second slag scraping machine 11, a second-stage air floatation tank 12, a second scum collecting tank 13, a second scum discharge port 14, a scum pool 15, an ABR baffling slow sedimentation tank 16 and a clear water reflux chamber 17, wherein the first coagulation mixer 1, the first coagulation reaction chamber 2, the first dissolved air release chamber 3, the first slag scraping machine 4, the first-stage air floatation tank 5, the first scum collecting tank 6, the second coagulation mixer 8, the second coagulation reaction chamber 9, the second dissolved air release chamber 10, the second slag scraping machine 11, the second scum collecting tank 12, the second scum collecting tank 13, the second scum pool 13, the ABR baffling slow sedimentation tank 16 and the clear water reflux chamber 17 are sequentially arranged at the bottom of the second scum discharge port 14, and the scum collecting tank 13 and the second scum collecting tank 7 are connected with the first dissolved air floatation tank bottom 7; the clear water reflux cabin 17 is connected with a first dissolved air water tank 22 through a first pipeline, a first booster pump 23 is arranged on the first dissolved air water tank 22, and a water outlet of the first booster pump 23 is connected with the second dissolved air release cabin 10 through a pipeline; the clear water reflux cabin 17 is connected with a second dissolved air water tank 20 through a second pipeline, a second booster pump 21 is arranged on the second dissolved air water tank 20, and a water outlet of the second booster pump 21 is connected with the first dissolved air release cabin 3 through a pipeline; the first dissolved air water tank 22 and the second dissolved air water tank 20 are connected through a conveying pipeline, a pressure air storage tank 19 is connected to the conveying pipeline between the first dissolved air water tank 22 and the second dissolved air water tank 20, and the pressure air storage tank 19 is connected to the turbine air compressor 18; the algae residue treatment system comprises a conch dehydrator and an algae residue anaerobic fermentation tank, wherein the conch dehydrator is connected with the algae residue tank 15, a residue discharge port of the conch dehydrator is connected with the algae residue anaerobic fermentation tank, and a filtrate port of the conch dehydrator is connected with the blue algae raw water regulation tank through a pipeline; the blue algae raw water regulation and storage tank is connected with an inlet of a first coagulation mixer 1 of the blue algae water separation device through a lifting pump 120; the disinfection system comprises an ozone generating device, wherein the ozone generating device comprises an oxygen generator 30, an oxygen storage tank 31, a primary air filter 32, a freeze dryer 33, a secondary air filter 34, an ozone generator 35 and an ozone contact oxidation tower 36, the oxygen generator 30 is connected with the oxygen storage tank 31 through a pipeline, the air outlet of the oxygen storage tank 31 is connected with the air inlet of the primary air filter 32, the air outlet of the primary air filter 32 is connected with the air inlet of the freeze dryer 33, the air outlet of the freeze dryer 33 is connected with the air inlet of the secondary air filter 34, the air outlet of the secondary air filter 34 is connected with the air inlet of the ozone generator 35, the air outlet of the ozone generator 35 is connected with the ozone contact oxidation tower 36 through a pipeline, a water outlet is arranged on one side of the top of the ozone contact oxidation tower 36, and a water inlet is arranged on one side of the bottom of the ozone contact oxidation tower 36.
In the embodiment, the blue algae-water separation device is in a double-sequence mode, algae removal is ensured by two-stage flocculation reaction, flocculating agents and coagulant aids with certain content proportion are added at the positions of the first coagulation mixer 1 and the second coagulation mixer 8, mixed water containing algae agents is formed under the high-speed stirring condition of the coagulation mixer, the ABR baffling slow sedimentation tank 16 is designed by adopting an ABR baffle plate water outlet design, when the effluent flows through the ABR baffling slow sedimentation tank 16, the flow velocity of water flowing through the position is rapidly reduced due to the abnormal heavy flow motion rule, so that partial suspended algae-like colloidal flocs in the effluent flow body are subjected to secondary sedimentation, and higher blue algae removal efficiency in the effluent is ensured; the effluent from the clear water backflow cabin 17 after passing through the ABR baffle plate enters the clear water backflow cabin 17, part of clear water is used as the water inlet and water supplementing of the second dissolved air water tank 20 and the first dissolved air water tank 22, and the rest of effluent flows to a disinfection and sterilization system through a water outlet pipe for ozone disinfection;
furthermore, the high-concentration algae raw water gathered in the blue algae raw water regulation and storage tank flows into the blue algae water separation device to carry out algae removal treatment, the dissolved air water containing micro-nano bubbles for treating the blue algae enriched water has small bubble diameter and large quantity, and under the combined action of the flocculating agent and the coagulant aid, the medicament and blue algae in the raw water form a large number of alum flocs to float on the surface of the air floatation tank, the blue algae residue solid phase and the liquid phase can be fully stripped under the action of the slag scraping machine, and part of blue algae suspended in the water is further removed after secondary air floatation;
Firstly, a first-stage reaction is carried out, flocculant and coagulant aid with a certain content ratio are added to a first position of a coagulation stirrer 1 of the system device, the mixture enters a first coagulation reaction cabin 2 under the high-speed stirring condition of the first coagulation stirrer 1, algae-containing agent mixed water enters a first dissolved air release cabin 3 after baffling action, a large number of micro-nano bubbles are stored in a pressure air storage tank 19 under the continuous working condition of a turbine air compressor 18, the bubbles enter a second dissolved air water tank 20, pressurized dissolved air water containing the micro-bubbles uniformly releases high-pressure dissolved air water into the first dissolved air release cabin 3 in a first-stage floatation tank 5 through the second dissolved air water tank 20, algae alum flowers and countless micro-dissolved air bubbles form algae slag clusters under the action of the high-pressure micro-dissolved air bubbles at the moment, the algae slag clusters floating on the surface of the floatation tank are directionally scraped to a first collecting tank 6 under the action of a first slag scraper 4, directly entering the algae residue pond 15 from the first algae residue discharge port 7 along a pipeline, then entering the second coagulation reaction chamber 9 to perform a secondary flocculation reaction, adding coagulant and coagulant aid adding device to the chamber under the action of the second coagulation mixer 8, adding algae medicament mixed water to the second dissolved air releasing chamber 10, storing a large number of micro-nano bubbles in the pressure air storage tank 19 under the continuous working condition of the turbine air compressor 18, entering the first dissolved air tank 22 by the bubbles, uniformly releasing the high-pressure dissolved air water containing the micro-bubbles to the second dissolved air releasing chamber 10 in the second floatation tank 12 by the first dissolved air tank 22, forming algae residue clusters by the alum and countless micro-dissolved bubbles under the action of the high-pressure micro-dissolved air bubbles, the algae residue clusters floating on the surface of the air floatation tank are directionally scraped to a second scum collecting tank 13 under the action of a second scum scraper 11, and directly enter the algae residue tank 15 from a second algae residue discharge port 14 along a pipeline, algae residue is dehydrated, water discharged from the air floatation tank enters the ABR baffling slow sedimentation tank 16 and is precipitated and then discharged to a clear water backflow cabin 17, part of clear water enters the clear water backflow cabin through a first booster pump 23 and a second booster pump 21 as a second dissolved air water tank 20 and a first dissolved air water tank 22 respectively, water is supplemented, and the rest of discharged water enters a rear-stage ozone generating device through a water outlet pipe;
Further, the ozone generating device is used for disinfecting the effluent after being precipitated 16 by the ABR baffling slow sedimentation tank, the ozone contact oxidation tower 36 is fully mixed and fully reacted with the effluent of the blue algae-water separation system to generate ozone molecules with higher concentration, the generated ozone is continuously conveyed to the ozone contact oxidation tower 36 under the action of the ozone generator 35 and fully mixed and fully reacted with the effluent of the blue algae-water separation system, so that blue algae and algae toxins with lower content in the effluent are eliminated, in addition, the solubility of O 3 molecules is higher than that of O 2, by adopting the mode, blue algae larvae and pathogenic microorganisms in the water can be killed, the dissolved oxygen content of the discharged water can be further improved, the eutrophication of the water can be effectively restrained, thereby the final purification of the river and lake water can be finally realized, and meanwhile, once the effluent contains a trace amount of algae toxins, the algae toxins can be catalyzed and oxidized through the strong oxidizing property of the ozone, and the stability of the effluent can be further ensured;
Further, the algae residues separated by the blue algae-algae water separator are dehydrated by the spiral shell stacking dehydrator, algae slurry water generated by dehydration flows back to the blue algae raw water regulating and storing tank, the generated semi-dry algae mud is conveyed to the algae residue anaerobic fermentation tank for anaerobic fermentation and then is transported to an organic fertilizer manufacturer for anaerobic fermentation, and the dehydrated blue algae residues are subjected to anaerobic fermentation, so that macromolecular organic matters are degraded into micromolecular low-grade organic acids, and high-quality raw materials are provided for the production of organic fertilizers, so that the algae residues are recycled.
Referring to fig. 1-5, according to the above embodiment, there is also provided a blue algae stabilization treatment process, comprising the steps of:
firstly, blue algae collection, namely collecting blue algae in river and lake water bodies into a cofferdam through a blue algae collection floating island cofferdam 100 so as to improve the concentration of the blue algae in the cofferdam;
step two, algae water is conveyed, the algae water collected in the algae collecting floating island cofferdam 100 is conveyed to a blue algae raw water regulation pool through an algae water lifting pump 120, and a blue algae concentration measuring instrument is connected with a PLC (programmable logic controller) through infinite transmission and is electrically connected with the lifting pump 120 through a wire;
Step three, blue algae-algae separation, blue algae in the blue algae-algae raw water regulating and accumulating pond enters a blue algae-algae water separating device through an algae water lifting pump 120 to carry out algae removal treatment, flocculant and coagulant aid with a certain content proportion are required to be added at the positions of a first coagulation stirrer 1 and a second coagulation stirrer 8, a large amount of alum flocs formed by the medicament and the blue algae in raw water float on the surface of an air floatation pond under the combined action of the flocculant and the coagulant aid, the blue algae-algae slag solid phase and the liquid phase can be fully stripped under the action of a first slag scraper 4 and a second slag scraper 11, part of blue algae suspended in water is further removed after being air-floated through a first air floatation pond 5 and a second air floatation pond 12, the algae slag clusters floating on the surface of the air floatation pond are directionally scraped to a first slag collecting groove 6 under the action of the first slag scraper 4, the algae slag clusters floating on the surface of the air floatation pond are directionally scraped to a second slag collecting groove 13 under the action of the second slag scraper 11, and flow into a water tank and a water tank through a second water tank 21 through a water tank and a water outlet pipe 20 respectively, and a water outlet pipe 20 flows into a water tank 20 after being separated from the water tank and a water outlet pipe 20 are respectively dissolved out;
Step four, algae residue dehydration treatment, namely, dehydration treatment is carried out on the algae residue through a conch dehydrator, algae slurry water generated by dehydration is returned to a blue algae raw water regulation pool, and the generated semi-dry algae mud is conveyed to an algae residue anaerobic fermentation tank for anaerobic fermentation, so that macromolecular organic matters are degraded into micromolecular low-grade organic acids, high-quality raw materials are provided for organic fertilizer production, and the organic residues are transported to an organic fertilizer manufacturer after fermentation, thereby realizing resource utilization of the algae residue;
Step five, sterilizing, namely sterilizing the effluent water which is precipitated by the ABR baffling slow sedimentation tank 16 by an ozone generating device, and fully mixing and fully reacting the ozone contact oxidation tower 36 with the effluent water of the blue algae-water separation system to eliminate blue algae and algae toxins with lower content in the effluent water and kill blue algae larvae and pathogenic microorganisms in the water body.
The working principle of the invention is as follows:
The method comprises the following steps:
firstly, blue algae collection, namely collecting blue algae in river and lake water bodies into a cofferdam through a blue algae collection floating island cofferdam 100 so as to improve the concentration of the blue algae in the cofferdam;
Step two, algae water is conveyed, algae water collected in the algae collecting floating island cofferdam 100 is conveyed to the algae raw water regulation and storage pool through the algae water lifting pump 120, the algae concentration measuring instrument is connected with the PLC controller through infinite transmission, the PLC controller is electrically connected with the lifting pump 120 through a lead, when the algae concentration measuring value is lower than a set value, the algae water lifting pump 120 is in a standby state and does not lift low-concentration algae water, when the algae concentration measuring instrument is higher than the set value, the algae water lifting pump 120 is automatically started and conveys to a rear-section system, and in the running process of the whole system, the start and stop of the algae water lifting pump 120 is used as an execution instruction of the running/stop of the whole system, the function is set to effectively reduce the problem that the whole system is frequently started and stopped when the algae content at a water inlet end is lower, so that the running energy consumption of the system is too high, and the running low-consumption and high-efficiency running of the whole system can be further realized;
Step three, blue algae and algae are separated, blue algae in a blue algae raw water regulating and accumulating pond enters a blue algae and algae water separating device through an algae water lifting pump 120 to carry out algae removal treatment, flocculating agents and coagulant aids with certain content proportion are required to be added at the positions of a first coagulation stirrer 1 and a second coagulation stirrer 8, a large amount of alum flocs are formed by the agents under the combined action of the flocculating agents and the coagulant aids and float on the surface of an air floatation pond, the solid phase and the liquid phase of blue algae and algae residues can be fully stripped under the action of a first residue scraping machine 4 and a second residue scraping machine 11, part of blue algae suspended in water is further removed after being air-floated by a first air floatation pond 5 and a second air floatation pond 12, the algae residue clusters floating on the surface of the air floatation pond are directionally scraped to a first scum collecting groove 6 under the action of the first residue scraping machine 4, and directly enter the algae residue pond 15 from a first algae residue discharging port 7 along a pipeline, the algae residue floating on the surface of the air floatation tank is directionally scraped into a second scum collecting tank 13 under the action of a second scum scraper 11, and directly enters the algae residue tank 15 from a second algae residue discharge port 14 along a pipeline, water discharged from the air floatation tank enters and flows into an ABR baffling slow sedimentation tank 16 to be precipitated and then flows out to a clear water reflux cabin 17, part of clear water respectively enters and supplements water flowing to a dissolved-air water tank through a second booster pump 21 and a first booster pump 23 as a second dissolved-air water tank 20 and a first dissolved-air water tank 22, the rest of water enters a rear-stage ozone generating device through a water outlet pipe, the ozone generating device is used for sterilizing the water discharged after the precipitation 16 of the ABR baffling slow sedimentation tank, the ozone contact oxidation tower 36 and the water discharged from a blue algae-water separation system are fully mixed and fully reacted to generate ozone molecules with higher concentration, the generated ozone is continuously conveyed to the ozone contact oxidation tower 36 under the action of the ozone generator 35, and is fully mixed and fully reacted with the effluent of the blue algae-water separation system to eliminate blue algae and algae toxins with lower content in the effluent, in addition, the solubility of O 3 molecules is higher than that of O 2, the blue algae larvae and pathogenic microorganisms in the water body can be killed by the disinfection treatment in the mode, the dissolved oxygen content of the discharged water body can be further improved, the eutrophication of the water body can be effectively restrained, the final purification of the river-lake blue algae water body is finally realized, and meanwhile, once the effluent contains trace algae toxins, the algae toxins can be catalyzed and oxidized by the strong oxidizing property of ozone, and the stability of the effluent can be further ensured;
Step four, algae residue dehydration treatment, namely, dehydration treatment is carried out on the algae residue through a conch dehydrator, algae slurry water generated by dehydration flows back to a blue algae raw water regulation and storage tank, and the generated semi-dry algae mud is conveyed to an algae residue anaerobic fermentation tank for anaerobic fermentation and then is conveyed to an organic fertilizer manufacturer;
The ozone generating device disinfects the effluent after the sediment 16 is deposited by the ABR baffling slow sedimentation tank, the ozone contact oxidation tower 36 is fully mixed and fully reacted with the effluent of the blue algae water separation system to generate ozone molecules with higher concentration, the generated ozone is continuously conveyed to the ozone contact oxidation tower 36 under the action of the ozone generator 35 to be fully mixed and fully reacted with the effluent of the blue algae water separation system, so that blue algae and algae toxins with lower content in the effluent are eliminated, in addition, the solubility of O 3 molecules is higher than that of O 2, by adopting the mode, blue algae larvae and pathogenic microorganisms in the water body can be killed, the dissolved oxygen content of the discharged water body can be further improved, the water body eutrophication can be effectively restrained, thereby the final purification of the river and lake water body is finally realized, meanwhile, once the effluent contains trace amounts of algae toxins, the algae toxins can be catalyzed and oxidized through the strong oxidizing property of the ozone itself, the stability of the effluent can be further ensured, and the blue algae larvae and algae toxin with lower content in the effluent can be eliminated, and blue algae larvae and pathogenic microorganisms in the water body can be killed.
Although embodiments of the invention have been shown and described, the detailed description is to be construed as exemplary only and is not limiting of the invention as the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and modifications, substitutions, variations, etc. may be made in the embodiments as desired by those skilled in the art without departing from the principles and spirit of the invention, provided that such modifications are within the scope of the appended claims.
Claims (10)
1. The blue algae stabilization treatment system comprises a blue algae raw water regulation and storage tank, a blue algae collecting system, a blue algae bath water separation system, a disinfection system and a algae residue treatment system, and is characterized in that the blue algae collecting system comprises a blue algae collecting floating island cofferdam (100), a conveying connecting pipeline (110) and a lifting pump (120), the blue algae collecting floating island cofferdam (100) is arranged in a funnel-shaped structure with a wide upper part and a narrow lower part, the blue algae collecting floating island cofferdam (100) comprises a foaming buoy and a light aluminum alloy plate, the foaming buoy surrounds the blue algae collecting area, the light aluminum alloy plate is positioned at the bottom of the foaming buoy, the joint between the light aluminum alloy plates is connected through a rubber gasket, one end inlet of the conveying connecting pipeline (110) is communicated with the bottom of the blue algae collecting floating island cofferdam (100), the inlet of the lifting pump (120) is communicated with the outlet of the conveying connecting pipeline (110), and the outlet of the lifting pump (120) is connected with the raw water regulation and storage tank.
2. The blue algae stabilization treatment system according to claim 1, wherein a blue algae concentration measuring instrument is arranged on the surface of a blue algae water body in the blue algae collection floating island cofferdam (100), the blue algae concentration measuring instrument is connected with a PLC (programmable logic controller) through infinite transmission, and the PLC is electrically connected with the lifting pump (120) through a wire.
3. The blue algae stabilization treatment system according to claim 1, wherein the blue algae separation system comprises a blue algae water separation device, the blue algae water separation device comprises a first coagulation mixer (1), a first coagulation reaction chamber (2), a first dissolved air release chamber (3), a first slag scraping machine (4), a first-stage air floatation tank (5), a first scum collecting tank (6), a first algae slag discharge port (7), a second coagulation mixer (8), a second coagulation reaction chamber (9), a second dissolved air release chamber (10), a second slag scraping machine (11), a second air floatation tank (12), a second scum collecting tank (13), a second algae slag discharge port (14), an algae slag tank (15), an ABR slow sedimentation tank (16) and a clear water reflux chamber (17), wherein the first coagulation mixer (1), the first coagulation reaction chamber (2), the first dissolved air release chamber (3), the first slag scraping machine (4), the first-stage air floatation tank (5), the first collecting tank (6), the second stirring machine (8), the second scum (9), the second scum collecting tank (13), the second water floatation tank (11), the second water floatation tank (16) and the second air floatation tank (17) are sequentially arranged, the first algae residue discharge opening (7) is positioned at the bottom of the first scum collecting tank (6), the first algae residue discharge opening (7) is connected with the algae residue pond (15), the second algae residue discharge opening (14) is positioned at the bottom of the second scum collecting tank (13), and the second algae residue discharge opening (14) is connected with the algae residue pond (15).
4. A blue algae stabilizing treatment system according to claim 3, characterized in that the clear water backflow cabin (17) is connected with a first dissolved air water tank (22) through a first pipeline, a first booster pump (23) is arranged on the first dissolved air water tank (22), and a water outlet of the first booster pump (23) is connected with the second dissolved air release cabin (10) through a pipeline.
5. The blue algae stabilizing treatment system according to claim 4, wherein the clear water backflow cabin (17) is connected with a second dissolved air water tank (20) through a second pipeline, a second booster pump (21) is arranged on the second dissolved air water tank (20), and a water outlet of the second booster pump (21) is connected with the first dissolved air release cabin (3) through a pipeline.
6. The blue algae stabilizing treatment system according to claim 5, wherein the first dissolved air water tank (22) and the second dissolved air water tank (20) are connected through a conveying pipeline, a pressure air storage tank (19) is connected to the conveying pipeline between the first dissolved air water tank (22) and the second dissolved air water tank (20), and the pressure air storage tank (19) is connected to a turbine air compressor (18).
7. The blue algae stabilizing treatment system according to claim 1, wherein the sterilizing system comprises an ozone generating device, the ozone generating device comprises an oxygen generator (30), an oxygen storage tank (31), a primary air filter (32), a freeze dryer (33), a secondary air filter (34), an ozone generator (35) and an ozone contact oxidation tower (36), the oxygen generator (30) is connected with the oxygen storage tank (31) through a pipeline, an air outlet of the oxygen storage tank (31) is connected with an air inlet of the primary air filter (32), an air outlet of the primary air filter (32) is connected with an air inlet of the freeze dryer (33), an air outlet of the freeze dryer (33) is connected with an air inlet of the secondary air filter (34), an air outlet of the secondary air filter (34) is connected with an air inlet of the ozone generator (35), an air outlet of the ozone generator (35) is connected with the ozone contact oxidation tower (36) through a pipeline, a water outlet is arranged on one side of the top of the ozone contact oxidation tower (36), and a water inlet is arranged on one side of the ozone contact oxidation tower (36).
8. The blue algae stabilization treatment system according to claim 3, wherein the algae residue treatment system comprises a spiral shell stacking dehydrator and an algae residue anaerobic fermentation tank, the spiral shell stacking dehydrator is connected with the algae residue tank (15), a residue discharging port of the spiral shell stacking dehydrator is connected with the algae residue anaerobic fermentation tank, and a filtrate port of the spiral shell stacking dehydrator is connected with the blue algae raw water regulation tank through a pipeline.
9. The blue algae stabilizing treatment system according to claim 1, wherein the blue algae raw water regulating reservoir is connected with an inlet of a first coagulation mixer (1) of the blue algae water separating device through a lifting pump (120).
10. A blue algae stabilization treatment process is characterized by comprising the following steps:
Firstly, blue algae collection, namely collecting blue algae in river and lake water bodies into a cofferdam through a blue algae collection floating island cofferdam (100) so as to improve the concentration of the blue algae in the cofferdam;
step two, algae water is conveyed, algae water collected in the blue algae collecting floating island cofferdam (100) is conveyed to a blue algae raw water regulating and accumulating tank through an algae water lifting pump (120), and a blue algae concentration measuring instrument is connected with a PLC (programmable logic controller) through infinite transmission and is electrically connected with the lifting pump (120) through a lead;
Step three, blue algae and algae water separation, blue algae in the blue algae raw water regulating and accumulating pond enters a blue algae and algae water separating device through an algae water lifting pump (120) to carry out algae removal treatment, flocculant and coagulant aid with a certain content ratio are added at the positions of a first coagulation stirrer (1) and a second coagulation stirrer (8), a large amount of alum flocs formed by the medicament and blue algae in raw water float on the surface of an air floatation pond under the combined action of the flocculant and the coagulant aid, sufficient stripping of blue algae and algae residue solid phase and liquid phase can be realized under the action of the first slag scraping machine (4) and the second slag scraping machine (11), part of blue algae suspended in water is further removed after air floatation of the first air floatation pond (5) and the second air floatation pond (12), algae residue clusters floating on the surface of the air floatation pond are directionally scraped to a first slag collecting tank (6) under the action of the first slag scraping machine (4), the algae residues directly enter the air floatation pond (15) from a first algae residue discharging port (7), the algae residues directly float on the surface of the second slag scraping machine (11) under the action of the second slag scraping machine (11) and flow into a second water tank (21) from the air floatation tank (20) to a water tank (21) to a water tank (20) respectively, the algae residues directly flow into a water tank (20) and a water tank (21) to be directly flowed into a water tank (20), the rest water enters the rear-stage ozone generating device through the water outlet pipe;
Step four, algae residue dehydration treatment, namely, dehydration treatment is carried out on the algae residue through a conch dehydrator, algae slurry water generated by dehydration flows back to a blue algae raw water regulation and storage tank, and the generated semi-dry algae mud is conveyed to an algae residue anaerobic fermentation tank for anaerobic fermentation and then is conveyed to an organic fertilizer manufacturer;
Step five, sterilizing, namely sterilizing the effluent precipitated by the ABR baffling slow sedimentation tank (16) by an ozone generating device, and fully mixing and reacting the ozone contact oxidation tower (36) with the effluent of the blue algae-water separation system to eliminate blue algae and algae toxins with lower content in the effluent and kill blue algae larvae and pathogenic microorganisms in the water.
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