Water ecological restoration equipment and sewage zero discharge treatment method

Abstract

The invention discloses water ecological restoration equipment and a sewage zero discharge treatment method.The water ecological restoration equipment comprises sewage discharge equipment and further comprises air floatation equipment, a flocculation zone, a solid-liquid separation zone and a scum cleaning zone are sequentially arranged in the air floatation equipment in the sewage trend, and an inlet of the flocculation zone is connected with the outlet end of the sewage discharge equipment; a microbubble release mechanism for solid-liquid separation is arranged in the solid-liquid separation area; a scraping mechanism is arranged in the scum cleaning area; scum in the scum cleaning area is scraped to sludge temporary storage equipment through a scraping mechanism; a sewage inlet of the reaction precipitation equipment is connected with a sewage outlet of the scum cleaning area, a dosing mechanism is arranged in the reaction precipitation equipment, a circulating pipe is connected between the reaction precipitation equipment and the sewage discharging equipment, and the circulating pipe is used for enabling treated water to flow back to the sewage discharging equipment. According to the invention, the key link of impurity removal in the sewage treatment process is guaranteed, the overall sewage treatment efficiency and quality are improved, water after multi-link treatment can be recycled, and finally zero discharge of sewage is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of water ecological restoration, and in particular to a water ecological restoration device and a sewage zero-discharge treatment method. Background Art

[0002] Sewage treatment is a key work direction in water ecological restoration. Sewage treatment is the process of purifying sewage to meet the water quality requirements for discharge into a water body or reuse. Sewage treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care, catering, etc., and is increasingly entering the daily lives of ordinary people. According to the source of sewage, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage, and medical sewage, while domestic sewage is sewage generated in daily life. It refers to a complex mixture of various forms of inorganic and organic matter. There are many ways to treat sewage, which can generally be summarized as physical, chemical, and biological methods.

[0003] Industrial wastewater refers to wastewater produced in the process of industrial plant production, such as oily wastewater from the production of ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol, oil tank area, air separation and air compressor station, etc. After being treated by industrial wastewater treatment equipment, it can generally meet the national secondary emission standards. Due to the shortage of water resources, the water that meets the emission standards needs to be further treated in depth to meet the requirements of industrial water replenishment and reuse. Since the impurities in the water are mainly suspended particles and fine fibers, the impurities are removed by microporous filtration technology using the principle of mechanical filtration. The working condition of the filter equipment is controlled by PLC or time relay to realize automatic backwashing and automatic operation, and the lifting pump provides the required water head for the filter, and the effluent is directly introduced into the production system. Industrial wastewater treatment equipment has the advantages of wide application range, good treatment effect, low cost, short treatment time, convenient operation and maintenance, and low power consumption. It can be widely used in the deep treatment of industrial wastewater.

[0004] However, the inventors found that the prior art had the following problems during implementation:

[0005] 1. At present, most industrial wastewater treatment equipment uses filter plates to achieve solid-liquid separation. During the filtration process, a layer of filter cake will form on the surface of the filter plate. As time goes by, the filter cake will gradually thicken, eventually causing the filter plate to become clogged and the filtration efficiency to decrease;

[0006] 2. At present, most industrial wastewater treatment equipment still discharges treated wastewater into the natural environment, which will more or less affect the natural environment. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a water ecological restoration device and a sewage zero-discharge treatment method.

[0008] The present invention discloses a water ecological restoration device, including a sewage discharge device, and further comprising:

[0009] An air flotation device, wherein a flocculation zone, a solid-liquid separation zone and a scum cleaning zone are sequentially arranged along the direction of the sewage, and the inlet end of the flocculation zone is connected to the outlet end of the sewage discharge device; a micro-bubble release mechanism is arranged in the solid-liquid separation zone, and the micro-bubble release mechanism is used to achieve solid-liquid separation of the sewage; and a scraping mechanism is arranged in the scum cleaning zone;

[0010] A sludge temporary storage device, wherein the sludge in the sludge cleaning area is scraped into the sludge temporary storage device by the scraping mechanism;

[0011] A reaction sedimentation device, wherein the sewage inlet of the reaction sedimentation device is connected to the sewage outlet of the scum cleaning area, the reaction sedimentation device is provided with a dosing mechanism, a circulation pipe is connected between the reaction sedimentation device and the sewage discharge device, and the circulation pipe is used to return the water treated by the reaction sedimentation device to the sewage discharge device; the sludge outlets of the reaction sedimentation device and the sludge temporary storage device are both connected to the sludge pipe.

[0012] As a further improvement of the present invention, the flotation equipment comprises a tank body, wherein an upper baffle and a lower baffle are arranged in the tank body at intervals along the flow direction of the sewage, and the upper baffle and the lower baffle divide the tank body into the flocculation zone, the solid-liquid separation zone and the scum cleaning zone; the bottom of the upper baffle and the top of the lower baffle form a water flow channel;

[0013] The bottom of the side wall of the pool body at one end away from the sewage discharge device is provided with a plurality of sewage discharge ports; the top of the side wall of the pool body at one end away from the sewage discharge device is inclined inwardly to form a side wall shared with the sludge temporary storage device.

[0014] As a further improvement of the present invention, a plurality of stirring mechanisms are installed in the flocculation zone, and the plurality of stirring mechanisms are arranged at intervals in the flocculation zone;

[0015] The stirring mechanism comprises a first motor, a stirring rod and stirring blades. The first motor is installed on the top of the flocculation zone. The output shaft of the first motor is vertically connected to the stirring rod downward. The stirring rod is provided with multiple layers of stirring blades at intervals along the vertical direction.

[0016] As a further improvement of the present invention, the microbubble releasing mechanism includes a gas dissolving tube and a bubble outlet tube;

[0017] The air dissolving pipe is installed across the top of the solid-liquid separation zone, and the axial direction of the air dissolving pipe is perpendicular to the flow direction of the sewage. A plurality of bubble outlet pipes are installed at intervals along the axial direction at the bottom of the air dissolving pipe, and the plurality of bubble outlet pipes are arranged in the vertical direction. A plurality of holes are opened on the side wall of each bubble outlet pipe. One end of the air dissolving pipe is connected to one end of a return pipe, and the other end of the return pipe is connected to the scum cleaning zone. The return pipe is used to return part of the sewage treated in the scum cleaning zone to the air dissolving pipe to mix with the compressed air.

[0018] As a further improvement of the present invention, the scraping mechanism comprises a rotating shaft, a crawler, a scraping rod and a scraper;

[0019] The two groups of rotating shafts are respectively arranged across the top of the front end and the rear end of the scum cleaning area, and the two ends of the front and rear groups of rotating shafts are respectively connected by the crawler transmission, and one end of one group of rotating shafts is also connected to the second motor; a plurality of scraping rods are installed at intervals between the crawlers on both sides, and the scraper is installed on the upper and lower parts of each scraper rod, and the scraper scrapes the scum in the scum cleaning area to the sludge temporary storage equipment through the rotation of the crawler.

[0020] As a further improvement of the present invention, the sludge temporary storage device is in an inverted triangle shape, and the side of the sludge temporary storage device close to the flotation device shares a side wall with the flotation device, and the top of the side wall is lower than the height of the flotation device; the sludge outlet of the sludge temporary storage device is connected to the sludge pipe.

[0021] As a further improvement of the present invention, the reaction precipitation equipment includes a reaction precipitation tank, the drug adding mechanism includes a drug barrel, a drug delivery tube, and a drug dropper; the drug barrel is arranged on one side of the reaction precipitation tank, a plurality of drug droppers are arranged at intervals on the top of the reaction precipitation tank, and the plurality of drug droppers extend along the flow direction of the sewage; a plurality of drug droppers are arranged at the bottom of each drug dropper along its axial direction;

[0022] The drug delivery pipe is arranged at the top of the reaction sedimentation tank perpendicular to the flow direction of the sewage, and the drug delivery pipe is connected to each of the drug dropper tubes, and one end of the drug delivery pipe is connected to the drug barrel;

[0023] The inlet end of the reaction sedimentation tank is connected to the sewage outlet of the scum cleaning area through a drainage pipe, and one side of the reaction sedimentation tank is connected to the circulation pipe.

[0024] The present invention also discloses a zero-discharge sewage treatment method, which is applied to the above-mentioned water ecological restoration equipment, comprising:

[0025] Step S1, the sewage discharged from the sewage discharge equipment enters the flocculation area of ​​the flotation equipment, and at the same time, flocculants and coagulants are added to the flocculation area and fully stirred to flocculate impurities in the sewage;

[0026] Step S2, the flocculated sewage flows into the solid-liquid separation area of ​​the flotation equipment, and microbubbles are released through the microbubble release mechanism in the solid-liquid separation area. The microbubbles adhere to the flocculated impurities and drive the impurities to float to the scum cleaning area, thereby completing solid-liquid separation;

[0027] Step S3, the scraping mechanism scrapes the scum located on the liquid surface to the sludge temporary storage device;

[0028] Step S4, the sewage cleaned in the scum cleaning area flows into the reaction precipitation device, and a precipitation agent is added to the sewage through a dosing mechanism in the reaction precipitation device to precipitate the remaining impurities in the sewage;

[0029] Step S5, returning the water treated by the reaction precipitation equipment to the sewage discharge equipment through the circulation pipe to achieve zero discharge of the sewage.

[0030] As a further improvement of the present invention, it also includes:

[0031] The sludge in the sludge temporary storage device and the sludge after precipitation in the reaction precipitation device are both discharged through the sludge pipe.

[0032] As a further improvement of the present invention, in the step S4, it also includes:

[0033] Part of the sewage cleaned in the scum cleaning area also flows back to the micro-bubble releasing mechanism through the return pipe, so that the part of the sewage continues to mix with the compressed air.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention sets a flocculation area, a solid-liquid separation area and a scum cleaning area through an air flotation device, and the flocculation area is connected to the sewage discharge equipment. After the sewage enters the flocculation area, flocculants and coagulants can be added to react accordingly, and then flow into the solid-liquid separation area, and the microbubbles are released by means of a microbubble release mechanism set in the solid-liquid separation area, so that the microbubbles are attached to the flocculated suspended matter, and the flocs and bubbles are raised to the scum cleaning area together by buoyancy to form scum, thereby achieving solid-liquid separation, ensuring the key link of impurity removal in the sewage treatment process, and improving the overall sewage treatment efficiency and quality.

[0036] The present invention is provided with a scraping mechanism in the scum cleaning area, which can scrape the scum into the sludge temporary storage device, and the sewage inlet of the reaction precipitation device is connected to the sewage outlet of the scum cleaning area. The reaction precipitation device is provided with a dosing mechanism, which can further treat the sewage, and a circulation pipe is connected between the reaction precipitation device and the sewage discharge device, which can return the water treated by the reaction precipitation device to the sewage discharge device, so that the water treated by multiple links can be recycled, and finally achieve zero sewage discharge. At the same time, the sludge outlets of the reaction precipitation device and the sludge temporary storage device are connected to the sludge pipe, which is convenient for the unified discharge of the sludge generated during the treatment process, maintaining the stable operation of the entire equipment and the reasonable disposal of various types of waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the main structure of a water ecological restoration device disclosed in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the rear structure of a water ecological restoration device disclosed in an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the full cross-section structure of a water ecological restoration device disclosed in an embodiment of the present invention;

[0040] Figure 4 The present invention is a flowchart of a method for zero-discharge treatment of sewage according to an embodiment of the present invention.

[0041] In the figure:

[0042] 1. Sewage discharge equipment; 2. Sewage pipe; 3. Flotation equipment; 301. Flocculation area; 302. Solid-liquid separation area; 303. Scum cleaning area; 4. Fixed plate; 5. First motor; 6. Stirring rod; 7. Stirring sheet; 8. Limiting block; 9. Dissolving air pipe; 10. Bubble pipe; 11. Reflux pipe; 12. Limiting plate; 13. Rotating shaft; 14. Crawler track; 15. Scraper rod; 16. Scraper; 17. Drain pipe; 18. Reaction sedimentation equipment; 19. Sludge temporary storage equipment; 20. Dropping tube; 21. Dropping port; 22. Drug delivery tube; 23. Drug barrel; 24. Circulation pipe; 25. Sludge pipe; 26. Upper baffle; 27. Lower baffle. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0047] like Figure 1-2 As shown, a water ecological restoration device provided by the present invention includes a sewage discharge device 1, an air flotation device 3, a sludge temporary storage device 19 and a reaction precipitation device 18, wherein the sewage discharge device 1 discharges sewage, and a flocculation area 301, a solid-liquid separation area 302 and a scum cleaning area 303 are sequentially arranged in the air flotation device 3 along the direction of the sewage, and the inlet end of the flocculation area 301 is connected to the outlet end of the sewage discharge device; a microbubble releasing mechanism is arranged in the solid-liquid separation area 302, and the microbubble releasing mechanism is used to realize the solid-liquid separation of the sewage; the scum cleaning area A scraping mechanism is arranged in 303; the scum in the scum cleaning area 303 is scraped into the sludge temporary storage device 19 through the scraping mechanism; the sewage inlet of the reaction sedimentation device 18 is connected to the sewage outlet of the scum cleaning area 303, and a dosing mechanism is arranged in the reaction sedimentation device 18. A circulation pipe 24 is connected between the reaction sedimentation device 18 and the sewage discharge device 1, and the circulation pipe 24 is used to return the water treated by the reaction sedimentation device 18 to the sewage discharge device 1; the sludge outlets of the reaction sedimentation device 18 and the sludge temporary storage device 19 are both connected to the sludge pipe.

[0048] In this embodiment, a flocculation zone 301 , a solid-liquid separation zone 302 and a scum cleaning zone 303 are provided by the air flotation device 3 , and the flocculation zone 301 is connected to the sewage discharge device 1 . After the sewage enters the flocculation zone 301, flocculants and coagulants can be added to carry out corresponding reactions, and then the sewage flows into the solid-liquid separation zone 302. The microbubbles are released by the microbubble release mechanism provided in the solid-liquid separation zone 302, so that the microbubbles are attached to the flocculated suspended matter, and the flocs and bubbles are raised to the scum cleaning zone 303 together by buoyancy to form scum, thereby realizing solid-liquid separation, ensuring the key link of impurity removal in the sewage treatment process, and improving the efficiency and quality of the overall sewage treatment; by providing a scraping mechanism in the scum cleaning zone 303, the scum can be scraped into the sludge temporary storage device 19, and the sewage inlet of the reaction precipitation device 18 is connected to the sewage outlet of the scum cleaning zone 303, and the reaction precipitation device 18 is provided with a dosing mechanism, which can further treat the sewage, and a circulation pipe 24 is connected between the reaction precipitation device 18 and the sewage discharge device 1, which can return the water treated by the reaction precipitation device 18 to the sewage discharge device 1, so that the water treated by multiple links can be recycled, and finally achieve zero sewage discharge. At the same time, the sludge outlets of the reaction sedimentation equipment 18 and the sludge temporary storage equipment 19 are connected to the sludge pipe 25, which is convenient for the unified discharge of the sludge generated during the treatment process, maintaining the stable operation of the entire equipment and the reasonable disposal of various types of waste.

[0049] Specific:

[0050] like Figure 3 As shown, in the above embodiment, preferably, the flotation device 3 includes a tank body, in which an upper baffle 26 and a lower baffle 27 are arranged at intervals along the flow direction of sewage, and the upper baffle 26 and the lower baffle 27 divide the tank body into a flocculation area 301, a solid-liquid separation area 302 and a scum cleaning area 303; the upper baffle 26 is installed at the upper part of the tank body, and a channel for sewage circulation is formed between the upper baffle 26 and the bottom of the tank body, and the lower baffle 27 is installed at the bottom of the tank body, and a channel for sewage circulation is formed on the top of the lower baffle 27; the arrangement of the upper baffle 26 and the lower baffle 27 forms an S-shaped water flow channel in the tank body.

[0051] In the above embodiment, preferably, a fixed plate is formed on the side wall of the pool body on the side close to the sewage discharge device 1, a plurality of sewage discharge outlets are provided at the bottom of the side wall of the pool body on the side away from the sewage discharge device 1, and the top of the side wall at one end of the pool body away from the sewage discharge device 1 is inclined inward to form a side wall shared with the sludge temporary storage device 19.

[0052] In the above embodiment, preferably, a plurality of stirring mechanisms are installed in the flocculation zone 301, and the plurality of stirring mechanisms are arranged at intervals in the flocculation zone 301; each stirring mechanism includes a first motor 5, a stirring rod 6 and a stirring blade 7, the first motor 5 is installed at the top of the flocculation zone 301, the output shaft of the first motor 5 is vertically connected to the stirring rod 6 downward, and the stirring rod 6 is provided with multiple layers of stirring blades 7 at intervals in the vertical direction. In this embodiment, the first motor 5 is installed at the top of the fixed plate 4, the bottom of the first motor 5 is movably connected to the stirring rod 6, and the stirring rod 6 is provided with multiple layers of stirring blades 7 at intervals in the vertical direction, and each layer of stirring blades includes multiple stirring blades arranged around the side wall of the stirring rod 6.

[0053] In the above embodiment, preferably, a sewage pipe 2 is further provided on the top of the flocculation zone 301 , and the other end of the sewage pipe 2 is connected to the outlet end of the sewage discharge equipment 1 .

[0054] In the above embodiment, preferably, the microbubble release mechanism includes a dissolved air pipe 9 and a bubble outlet pipe 10, wherein a limit block 8 is fixedly connected to the middle of the top of the solid-liquid separation zone 302 of the flotation equipment 3, and a dissolved air pipe 9 is fixedly connected to one side of the limit block 8. The dissolved air pipe 9 is installed across the top of the solid-liquid separation zone 302, and the axial direction of the dissolved air pipe 9 is perpendicular to the flow direction of the sewage. A plurality of bubble outlet pipes 10 are installed at intervals along the axial direction of the dissolved air pipe 9 at the bottom of the dissolved air pipe 9, and the plurality of bubble outlet pipes 10 are arranged in the vertical direction, and a plurality of holes are opened on the side wall of each bubble outlet pipe 10; a return pipe 11 is fixedly connected to the other side of the limit block 8, one end of the return pipe 11 is connected to the dissolved air pipe 9, and the other end of the return pipe 11 is connected to the scum cleaning zone 303, and the return pipe 11 is used to return part of the sewage treated in the scum cleaning zone 303 to the dissolved air pipe 9 to mix with the compressed air.

[0055] In the above embodiment, preferably, the microbubble releasing mechanism further comprises a compressed air supply device, which is used to provide compressed air into the air dissolving tube 9. The compressed air supply device is of existing design and will not be described in detail here.

[0056] In the above embodiment, preferably, the scraping mechanism includes a rotating shaft 13, a crawler 14, a scraper 15 and a scraper 16, wherein the top two sides of the scum cleaning area 303 of the air flotation device 3 are fixedly connected to the limit plates 12, two groups of rotating shafts 13 are respectively arranged across the front and rear ends of the scum cleaning area 303, and are rotatably installed on the limit plates 12 on both sides, the two ends of the front and rear groups of rotating shafts 13 are respectively connected by the crawler 14, and one end of one group of rotating shafts 13 is also connected to the second motor; a plurality of scraper bars 15 are installed at intervals between the crawlers 14 on both sides, and the upper and lower parts of each scraper bar 15 are installed with a scraper 16, and the scraper 16 is rotated by the crawler 14 to scrape the scum in the scum cleaning area 303 to the sludge temporary storage device 19. In this embodiment, a transmission structure is formed between the rotating shaft 13, the crawler 14, the scraper bar 15 and the scraper 16.

[0057] In the above embodiment, preferably, the sludge temporary storage device 19 is in an inverted triangle shape, and the side of the sludge temporary storage device 19 close to the flotation device 3 shares a side wall with the air flotation device, and the top of the side wall is lower than the height of the air flotation device 3, so that the scraping mechanism can smoothly scrape the sludge out to the sludge temporary storage device 19, and the sludge outlet of the sludge temporary storage device 19 is connected to the sludge pipe 25.

[0058] like Figure 1-2 As shown, in the above embodiment, preferably, the reaction sedimentation equipment 18 includes a reaction sedimentation tank, in which a dosing mechanism is arranged, and the dosing mechanism includes a medicine barrel 23, a medicine delivery pipe 22, and a medicine dropper 20; wherein, the medicine barrel 23 is arranged on one side of the reaction sedimentation tank, and a plurality of medicine droppers 20 are arranged at intervals on the top of the reaction sedimentation tank, and the plurality of medicine droppers 20 extend along the flow direction of the sewage; the bottom of each medicine dropper 20 is provided with a plurality of medicine dropper ports 21 along its axial direction; the medicine delivery pipe 22 is arranged at the top of the reaction sedimentation tank perpendicular to the flow direction of the sewage, and the medicine delivery pipe 22 is connected to each medicine dropper 20, and one end of the medicine delivery pipe 22 is connected to the medicine barrel 23; the inlet end of the reaction sedimentation tank is connected to the sewage discharge outlet of the scum cleaning area 303 through a plurality of drainage pipes 17, a circulation pipe 24 is fixedly connected to the middle of one side of the reaction sedimentation tank, and a sludge outlet is arranged at the lower part of one side of the reaction sedimentation tank, and the sludge outlet is connected to the sludge pipe 25.

[0059] like Figure 4 As shown, a zero-discharge sewage treatment method provided by the present invention is applied to the above-mentioned water ecological restoration equipment, which includes:

[0060] Step S1, the sewage discharged from the sewage discharge device 1 enters the flocculation area 301 of the flotation device 3, and at the same time, flocculants and coagulants are added to the flocculation area 301 and fully stirred to flocculate impurities in the sewage;

[0061] Step S2, the sewage after flocculation 301 flows into the solid-liquid separation area 302 of the flotation equipment 3, and the microbubbles are released by the microbubble release mechanism in the solid-liquid separation area 302, and the microbubbles are attached to the impurities after flocculation, and drive the impurities to float to the scum cleaning area 303, thereby completing the solid-liquid separation;

[0062] Step S3, the scraping mechanism scrapes the scum at the liquid surface to the sludge temporary storage device 19;

[0063] Step S4, the sewage cleaned in the scum cleaning area 303 flows into the reaction precipitation device 18, and a precipitation agent is added to the sewage through the dosing mechanism in the reaction precipitation device 18 to precipitate the remaining impurities in the sewage;

[0064] Step S5, returning the water treated by the reaction precipitation equipment 18 to the sewage discharge equipment 1 through the circulation pipe 24 to achieve zero discharge of sewage.

[0065] In the above embodiment, preferably, it further includes:

[0066] The sludge in the sludge temporary storage device 19 and the sludge after precipitation in the reaction precipitation device 18 are both discharged through the sludge pipe 25 .

[0067] In step S4, it also includes:

[0068] Part of the sewage cleaned by the scum cleaning area 303 also flows back to the micro-bubble release mechanism through the return pipe 11, so that the part of the sewage continues to mix with the compressed air.

[0069] Example 1

[0070] First, sewage flows from the sewage discharge device 1 through the sewage pipe 2 into the flotation device 3, and flocculants and coagulants are added to the flocculation area 301 of the flotation device 3. The first motor 5 works, and the stirring rod 6 and the stirring blade 7 rotate to make the sewage undergo an effective flocculation reaction and then enter the vicinity of the bubble outlet pipe 10 of the solid-liquid separation area 302. The clean water in the air dissolving pipe 9 is mixed with the compressed air to produce air-saturated dissolved water;

[0071] The dissolved gas water is rapidly released through the holes of the bubble outlet tube 10 under reduced pressure to form microbubbles, which are attached to the suspended matter with good flocculation. Since the suspended matter with a large number of microbubbles has a density less than 1, the flocs and bubbles will rise to the liquid surface together to form scum, thus achieving solid-liquid separation.

[0072] The rotating shaft 13 located in the scum cleaning area 303 rotates to drive the crawler belt 14 to operate, so that the scraper bar 15 and the scraper plate 16 are circulated to scrape the flocs on the liquid surface to the sludge temporary storage device 19;

[0073] A portion of the preliminarily treated sewage returns to the air dissolving pipe 9 through the reflux pipe 11 to continue mixing with the compressed air, and most of it enters the reaction sedimentation tank through the drainage pipe 17. The chemical agent is contained in the reagent barrel 23 next to the reaction sedimentation tank. The chemical agent passes through the drug delivery pipe 22 and the drug dropper 20 and finally falls into the reaction sedimentation tank through the drug dropper 21;

[0074] After waiting for a certain period of time, after the reaction in the reaction sedimentation tank is completely reacted, the sludge settles to the bottom of the reaction sedimentation tank, and the filtered water returns to the sewage discharge equipment 1 through the circulation pipe 24 and continues to be used for production, achieving zero sewage discharge. The sludge at the bottom of the reaction sedimentation tank and the sludge temporary storage equipment 19 is discharged through the sludge pipe 25.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water ecological restoration device, including a sewage discharge device, characterized in that: Also includes: An air flotation device, wherein a flocculation zone, a solid-liquid separation zone and a scum cleaning zone are sequentially arranged along the direction of the sewage, and the inlet end of the flocculation zone is connected to the outlet end of the sewage discharge device; a micro-bubble release mechanism is arranged in the solid-liquid separation zone, and the micro-bubble release mechanism is used to achieve solid-liquid separation of the sewage; and a scraping mechanism is arranged in the scum cleaning zone; A sludge temporary storage device, wherein the sludge in the sludge cleaning area is scraped into the sludge temporary storage device by the scraping mechanism; A reaction sedimentation device, wherein the sewage inlet of the reaction sedimentation device is connected to the sewage outlet of the scum cleaning area, the reaction sedimentation device is provided with a dosing mechanism, a circulation pipe is connected between the reaction sedimentation device and the sewage discharge device, and the circulation pipe is used to return the water treated by the reaction sedimentation device to the sewage discharge device; the sludge outlets of the reaction sedimentation device and the sludge temporary storage device are both connected to the sludge pipe.

2. The water ecological restoration equipment according to claim 1, characterized in that: The flotation equipment comprises a tank body, wherein an upper baffle and a lower baffle are arranged at intervals in the sewage flow direction, and the upper baffle and the lower baffle divide the tank body into the flocculation area, the solid-liquid separation area and the scum cleaning area; the bottom of the upper baffle and the top of the lower baffle form a water flow channel; The bottom of the side wall of the pool body at one end away from the sewage discharge device is provided with a plurality of sewage discharge ports; the top of the side wall of the pool body at one end away from the sewage discharge device is inclined inwardly to form a side wall shared with the sludge temporary storage device.

3. The water ecological restoration equipment according to claim 2, characterized in that: A plurality of stirring mechanisms are installed in the flocculation zone, and the plurality of stirring mechanisms are arranged at intervals in the flocculation zone; The stirring mechanism comprises a first motor, a stirring rod and stirring blades. The first motor is installed on the top of the flocculation zone. The output shaft of the first motor is vertically connected to the stirring rod downward. The stirring rod is provided with multiple layers of stirring blades at intervals along the vertical direction.

4. The water ecological restoration equipment according to claim 2, characterized in that: The microbubble releasing mechanism comprises an air dissolving tube and a bubble outlet tube; The air dissolving pipe is installed across the top of the solid-liquid separation zone, and the axial direction of the air dissolving pipe is perpendicular to the flow direction of the sewage. A plurality of bubble outlet pipes are installed at intervals along the axial direction at the bottom of the air dissolving pipe, and the plurality of bubble outlet pipes are arranged in the vertical direction. A plurality of holes are opened on the side wall of each bubble outlet pipe. One end of the air dissolving pipe is connected to one end of a return pipe, and the other end of the return pipe is connected to the scum cleaning zone. The return pipe is used to return part of the sewage treated in the scum cleaning zone to the air dissolving pipe to mix with the compressed air.

5. The water ecological restoration equipment according to claim 2, characterized in that: The scraping mechanism comprises a rotating shaft, a crawler belt, a scraping rod and a scraper; The two groups of rotating shafts are respectively arranged across the top of the front end and the rear end of the scum cleaning area, and the two ends of the front and rear groups of rotating shafts are respectively connected by the crawler transmission, and one end of one group of rotating shafts is also connected to the second motor; a plurality of scraping rods are installed at intervals between the crawlers on both sides, and the scraper is installed on the upper and lower parts of each scraper rod, and the scraper scrapes the scum in the scum cleaning area to the sludge temporary storage equipment through the rotation of the crawler.

6. The water ecological restoration equipment according to claim 2, characterized in that: The sludge temporary storage device is in an inverted triangle shape, and a side of the sludge temporary storage device close to the air flotation device shares a side wall with the air flotation device, and the top of the side wall is lower than the height of the air flotation device; The sludge outlet of the sludge temporary storage device is connected to the sludge pipe.

7. The water ecological restoration equipment according to claim 1, characterized in that: The reaction sedimentation equipment comprises a reaction sedimentation tank, and the dosing mechanism comprises a medicine barrel, a medicine delivery tube, and a medicine dropper; the medicine barrel is arranged on one side of the reaction sedimentation tank, and a plurality of medicine droppers are arranged at intervals on the top of the reaction sedimentation tank, and the plurality of medicine droppers extend along the flow direction of the sewage; a plurality of medicine droppers are arranged at the bottom of each medicine dropper along its axial direction; The drug delivery pipe is arranged at the top of the reaction sedimentation tank perpendicular to the flow direction of the sewage, and the drug delivery pipe is connected to each of the drug dropper tubes, and one end of the drug delivery pipe is connected to the drug barrel; The inlet end of the reaction sedimentation tank is connected to the sewage outlet of the scum cleaning area through a drainage pipe, and one side of the reaction sedimentation tank is connected to the circulation pipe.

8. A method for treating wastewater with zero discharge, which is applied to the water ecological restoration equipment according to any one of claims 1 to 7, characterized in that: include: Step S1, the sewage discharged from the sewage discharge equipment enters the flocculation area of ​​the flotation equipment, and at the same time, flocculants and coagulants are added to the flocculation area and fully stirred to flocculate impurities in the sewage; Step S2, the flocculated sewage flows into the solid-liquid separation area of ​​the flotation equipment, and microbubbles are released through the microbubble release mechanism in the solid-liquid separation area. The microbubbles adhere to the flocculated impurities and drive the impurities to float to the scum cleaning area, thereby completing solid-liquid separation; Step S3, the scraping mechanism scrapes the scum located on the liquid surface to the sludge temporary storage device; Step S4, the sewage cleaned in the scum cleaning area flows into the reaction precipitation device, and a precipitation agent is added to the sewage through a dosing mechanism in the reaction precipitation device to precipitate the remaining impurities in the sewage; Step S5, returning the water treated by the reaction precipitation equipment to the sewage discharge equipment through the circulation pipe to achieve zero discharge of the sewage.

9. The method for zero-discharge treatment of sewage according to claim 8, characterized in that: Also includes: The sludge in the sludge temporary storage device and the sludge after precipitation in the reaction precipitation device are both discharged through the sludge pipe.

10. The method for zero-discharge treatment of sewage according to claim 8, characterized in that: In the step S4, it also includes: Part of the sewage cleaned in the scum cleaning area also flows back to the micro-bubble releasing mechanism through the return pipe, so that the part of the sewage continues to mix with the compressed air.

Images