Ecological treatment module of ecological tail water treatment system

Abstract

The invention discloses an ecological treatment module of an ecological tail water treatment system, the ecological treatment module comprises a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter, supernatant water treated by a pre-treatment process is used for treating water-soluble organic matters in water through the salt-tolerant surface flow wetland, flows into the microalgae purification pond for absorbing salts in the water, and flows into the biological filter; an aeration device is arranged in the microalgae purification pond and comprises an aeration hole and an anti-blocking assembly moving relative to the surface of the aeration hole, and then the microalgae flows into the biological filter to be used for filtering and purifying the algae, so that nitrogen fixation and carbon fixation are realized. The invention provides the ecological module of the ecological tail water treatment system, which has the advantages of high efficiency, energy conservation, better treatment effect and difficulty in aeration pipe blockage.

Description

Technical Field

[0004] The invention relates to the technical field of sewage treatment, and in particular to an ecological treatment module of an ecological tailwater treatment system. Background Art

[0005] In the process of factory farming, the aquaculture tail water produced needs to be purified and treated to meet the standards before it can be recycled or discharged. For many aquaculture sites, which are often built in the suburbs and have a large available land area, it is very suitable to adopt a tail water ecological treatment system. For example, the publication number is CN 105399286A, and the subject name is a new type of aquaculture water body in situ ecological restoration system, which discloses the use of microalgae purification pools, algae-eating worm pools with microalgae as food, and fish ponds with algae-eating worms as food to achieve subsequent treatment of water after a certain treatment. The present invention constructs a similar and more effective ecological tail water treatment device, and in the prior art, aeration is generally required in the microalgae purification pond, and after the microalgae multiply in large quantities, various substances and fungi are easily attached to the surface of the microscopic aeration pipe, causing the pipe to be blocked. Summary of the invention

[0006] In view of the above shortcomings, the object of the present invention is to provide an ecological treatment module for treating ecological tail water of marine aquaculture with better treatment effect.

[0007] To this end, an ecological treatment module of an ecological tailwater treatment system of the present invention includes a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter. The supernatant water treated by the previous treatment process passes through the salt-tolerant surface flow wetland to treat water-soluble organic matter in the water, and flows into the microalgae purification pond to absorb salts in the water. An aeration device is provided in the microalgae purification pond, and the aeration device includes an aeration hole and an anti-blocking component moving relative to the surface of the aeration hole. The supernatant water then flows into the biological filter to filter and purify the algae to achieve nitrogen and carbon fixation.

[0008] Furthermore, the salt-tolerant surface flow wetland is provided with a plurality of blocks, and adjacent salt-tolerant surface flow wetlands are connected end to end through one or a plurality of pipelines.

[0009] Furthermore, there are several microalgae purification ponds, and adjacent microalgae purification ponds are arranged in series or in parallel. The biological filter includes multiple shellfish biological filters arranged in series, and the terminal shellfish ecological filter is provided with a filter and connected to the discharge pump station.

[0010] Furthermore, the aeration device includes a disc-shaped, parallel or mesh-shaped pipe arranged at the bottom of the pool, a microporous aeration tube vertically connected to the pipe, and a plurality of micropores are provided on the surface of the aeration tube. The anti-blocking component includes a rotating body and a rotating part connected to the rotating body and in contact with the outer surface of the microporous aeration tube.

[0011] Furthermore, the upper end of the microporous aeration tube includes a flange, the rotating body includes a bottom plate, the bottom plate is fixedly connected to the flange, a through hole is provided in the middle of the bottom plate, the rotating body includes a rotating shaft, an impeller is provided at one end of the rotating shaft, the impeller is arranged inside the microporous aeration tube, a limit block matching the bottom plate is fixed on the rotating shaft, a limit tube is provided on the upper side of the bottom plate, a top plate is provided at the upper end of the limit tube, and the outer periphery of the top plate is connected to the rotating part.

[0012] A sealing plate is provided at the upper end of the microporous aeration tube, the rotating body is sleeved on the sealing plate, the upper part of the rotating body is connected to a pipeline, the pipeline is connected to an air pump or a water pump, an arc-shaped radial channel is provided inside the rotating body, so that when gas or water is ejected from the channel, the rotating body is driven to rotate, and the lower part of the rotating body is connected to a rotating part.

[0013] Furthermore, the rotating part includes one or more longitudinal strips, adjacent longitudinal strips are spaced a predetermined distance apart, and a portion of the inner surface of the longitudinal strip is in contact with the outer wall of the microporous aeration tube.

[0014] Furthermore, the longitudinal strips are detachably connected to the top plate, and the bottoms of the longitudinal strips are connected with an annular strip or are not provided with an annular strip.

[0015] Furthermore, the drainage pump station includes a main water collection tank and an auxiliary water collection tank, both of which are connected to the biological filter tank, a connecting port is provided between the auxiliary water collection tank and the main water collection tank, the filter is arranged on the main water collection tank and extends from the connecting port to the auxiliary water collection tank, an outlet is arranged between the end of the auxiliary water collection tank and the main water collection tank, the outlet is provided with a filter, the auxiliary water collection tank is provided with a sluice between the connecting port and the outlet, and the main water collection tank is provided with a step between the connecting port and the outlet so that the water level of the main water collection tank corresponding to the outlet is lower than the bottom of the auxiliary water tank.

[0016] Furthermore, the preceding treatment process includes a vortex separation tank, an inclined plate sedimentation tank, a brush treatment tank, a filler denitrification tank, an aerated filler tank and a secondary sedimentation tank.

[0017] Beneficial technical effects of the present invention:

[0018] The ecological treatment module of an ecological tailwater treatment system of the present invention comprises a salt-tolerant surface flow wetland, a microalgae purification pond and a biofilter. The supernatant water treated by the pre-processing processes such as a vortex separation tank, an inclined plate sedimentation tank, a brush treatment tank, a filler denitrification tank, an aerated filler tank and a secondary sedimentation tank is used to treat the effect of water-soluble organic matter such as phosphate and ammonia nitrogen through the salt-tolerant surface flow wetland. After the pre-processing process, a water body with medium and low nutrient levels is formed. The artificial wetland ecological purification technology is suitable for the treatment of water bodies polluted by medium and low nutrient levels, and has the characteristics of energy saving, low operating cost, no need for professional management, simple operation and maintenance, and forming ecological landscape effects. Then it flows into the microalgae purification pond for absorbing nutrients in the water. The microalgae purification pond is provided with an aeration device, and the generated micro bubbles have a large contact surface with water in the water body, a low floating flow rate, a long contact time, and a good oxygenation effect. Adequate aeration and water flow can accelerate the growth of algae and bacteria, enhance the self-purification function of the water body, and accelerate the decomposition and transformation of organic matter such as pond bottom sediments and organic debris. The aeration device of the present invention includes an anti-blocking component that moves relative to the surface of the aeration hole, which can prevent the aeration pipe from being blocked, reduce the impact of algae accumulation and bacterial attachment, and then flow into the biological filter to filter and purify the algae, achieve nitrogen and carbon fixation, and realize the resource utilization of tail water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the arrangement of a specific embodiment of an ecological treatment module of the present invention;

[0020] Figure 2 It is a schematic diagram of the bottom aeration assembly of the pond;

[0021] Figure 3 It is a schematic diagram of Example 1 of a rotating body and a microporous aeration tube;

[0022] Figure 4 This is a schematic diagram of the connection between the rotating part and the top plate in Example 1;

[0023] Figure 5 is a schematic diagram of embodiment 2 of a rotating body;

[0024] Figure 6 Schematic diagram of the internal channel of the rotating body in Example 2;

[0025] Figure 7 A schematic diagram of the filtration device.

[0026] Explanation of the accompanying drawings: 1. Salt-tolerant surface flow wetland; 2. Microalgae purification pond; 3. Biofilter; 4. Aeration pipe; 5. Aeration device; 501. Microporous aeration pipe; 502. Rotating body; 503. Flange; 504. Bottom plate; 505. Rotating shaft; 506. Impeller; 507. Limit block; 508. Limit pipe; 509. Top plate; 510. Longitudinal bar; 511. Sealing plate; 512. Rotating body; 513. Limiting part; 514. Channel; 515. Sleeve; 516. Round nut; 6. Filter; 7. Main water collection tank; 8. Auxiliary water tank; 9. Connecting port; 10. Water outlet; 11. Step; 12. Water gate. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] Reference Figures 1 to 7 As shown, an ecological treatment module of an ecological tailwater treatment system of the present invention comprises a salt-tolerant surface flow wetland 1, a microalgae purification pond 2 and a biological filter 3. The supernatant water treated by the previous treatment process passes through the salt-tolerant surface flow wetland 1 to treat water-soluble organic matter in the water, and flows into the microalgae purification pond 2 to absorb salts in the water. An aeration device 5 is provided in the microalgae purification pond 2. The aeration device 5 comprises an aeration hole and an anti-blocking component moving relative to the surface of the aeration hole, and then flows into the biological filter 3 to filter and purify the algae to achieve nitrogen and carbon fixation.

[0029] The above-mentioned pre-treatment process includes a tailwater storage and regulating tank, two sets of tailwater treatment systems arranged in parallel, specifically including a vortex separation tank, an inclined plate sedimentation tank, a brush treatment tank, a filler denitrification tank, an aeration filler tank and a secondary sedimentation tank, as well as a fermentation tank and a sediment solidification tank. The tailwater storage and regulating tank serves as a primary sedimentation tank. The above-mentioned pre-treatment tailwater treatment system can adopt existing technology, which will not be described here. Its function is to remove most of the pollutants in the water body, and the sludge is discharged to the fermentation tank and the sediment solidification tank for treatment.

[0030] The supernatant water flowing out of the secondary sedimentation system enters the ecological treatment module of the present invention for the next ecological treatment. First, the supernatant water in the secondary sedimentation tank is introduced into the salt-tolerant surface flow wetland 1 through multiple pipes. The surface flow wetland is divided into several blocks separated from each other. The seawater salt-tolerant plant artificial wetland covers an area of ​​5,500 square meters. The natural seawater salt-tolerant plant artificial wetland is formed by domesticating wild emergent plants. The main salt-tolerant plants in the wetland are salt-tolerant plants such as Phragmites australis and reeds.

[0031] The water after the salt-tolerant surface flow wetland 1 enters the microalgae purification pond 2, and an aeration device 5 is provided at the bottom of the microalgae purification pond 2. A microporous aeration pipe (disc) is installed at the bottom of the pond, and the tiny bubbles generated have a large contact surface with the water in the water body, a low floating velocity, a long contact time, and a good oxygenation effect. Sufficient aeration and water flow can accelerate the growth of algae and bacteria, enhance the self-purification function of the water body, and accelerate the decomposition and conversion of organic matter such as sediments and organic debris at the bottom of the pond. Due to the growth of microalgae and bacteria in the microalgae purification pond 2, the microporous aeration pipe 501 at the bottom of the ordinary pond is more prone to blockage. An anti-blocking component is provided, and the microporous aeration tube 501 is transformed into an evenly spaced vertical distribution. A rotating body 502 is installed at the upper end of the microporous aeration tube 501. The rotating body 502 rotates relatively and contacts with the surface of the microporous aeration tube 501. This movement disturbs the water flow around the microporous aeration tube 501, making it difficult for the water to adhere to the surface of the microporous aeration tube 501. Secondly, the material attached to the surface of the microporous aeration tube 501 can also be scraped off.

[0032] After flowing out of the microalgae purification pond 2, it enters the biological filter 3. In this embodiment, 20 shellfish filters are constructed, each with a size of 8 meters * 5 meters. The water flows through the above shellfish filters one by one. The main function is to make full use of the principle of niche complementarity. Shellfish and other organisms filter and purify algae to achieve nitrogen and carbon fixation, and the tail water is utilized as a resource. After the water quality meets the standard, it is circulated to the breeding pond or discharged.

[0033] In the above embodiment, referring to Figure 1 As shown, the salt-tolerant surface flow wetland 1 is provided with several parallel blocks, separated in the middle, and adjacent salt-tolerant surface flow wetlands 1 are connected end to end through one or several pipes, that is, an inlet pipe is provided at one end of each block, and an outlet pipe is provided at the other end, forming an end-to-end arrangement, so that water flows along the length direction of each block, increasing the length of the surface flow. There are several microalgae purification ponds 2, and adjacent microalgae purification ponds 2 are arranged in series or in parallel. This embodiment adopts a series design of flowing through one by one, and the number of microalgae purification ponds 2 is 3.

[0034] In the above embodiment, referring to Figure 2 As shown, the bottom of the microalgae purification pond 2 is provided with an aeration device 5, including aeration pipes 4 arranged in parallel at equal intervals at the bottom of the pond, and of course, the aeration pipes 4 can also be arranged in a disc or mesh shape commonly used in the prior art at the bottom of the pond. Figure 3As shown, in Example 1 of the anti-blocking component, the upper end of the microporous aeration tube 501 includes a flange 503, the rotating body 502 includes a bottom plate 504, the rotating body 502 can be made of plastic material, a through hole is provided in the middle of the bottom plate 504, the rotating shaft 505 of the rotating body 502 passes through the through hole to enter the interior of the microporous aeration tube 501, an impeller 506 is provided at one end of the rotating shaft 505, the bottom plate 504 is fixedly connected to the flange 503 such as a commonly used bolt connection, a rubber sealing ring can be provided between the flange 503 and the bottom plate 504, a limiting block 507 cooperating with the bottom plate 504 is fixed on the rotating shaft 505, a limiting tube 508 is provided on the upper side of the bottom plate 504, a top plate 509 is provided on the upper end of the limiting tube 508, the top plate 509 is fixed to the other end of the rotating shaft 505, and the outer periphery of the top plate 509 is connected to the rotating part. The aeration pipe 4 is connected to an air pump, which delivers air with a certain pressure into the aeration pipe 4. The flowing gas drives the impeller 506 and the rotating shaft 505 to rotate, and the rotating shaft 505 drives the top plate 509 to rotate. In fact, the inner wall of the microporous aeration pipe 501 is also prone to blockage. In some cases, the rotating part can also be set on the rotating shaft inside the pipe, and a part of the rotating part contacts the inner wall of the microporous aeration pipe. Its working principle and function are basically the same as those of the rotating part set outside. Figure 3 and Figure 4 As shown, the rotating part of this embodiment may include one or more longitudinal bars 510, which are L-shaped in this embodiment, and adjacent longitudinal bars 510 are separated by a predetermined distance, and a portion of the inner surface of the longitudinal bars 510 contacts the outer wall of the microporous aeration tube 501. The longitudinal bars 510 are detachably connected to the top plate 509, and the bottoms of adjacent longitudinal bars 510 are connected by an annular bar.

[0035] Reference Figure 5 and Figure 6As shown, Example 2 of the present invention is basically the same as Example 1, except that a sealing plate 511 is provided at the upper end of the microporous aeration tube 501, the rotating body 502 includes a rotating body main body 512 and a limiting portion 513 connected to the rotating body 502, a step hole is provided at the center of the main body of the rotating body 502, the rotating body main body 512 is provided above the sealing plate 511, and a plurality of limiting portions 513 are connected to the rotating body main body 512 by bolts or buckles, etc., the rotating body main body 512 is also connected to a rotating portion, and the limiting portion 513 can be provided at a position between adjacent rotating portions. The upper part of the rotating body 502 is connected to a pipeline, and the pipeline is connected to an air pump or a water pump. An arc-shaped radial channel 514 is provided inside the rotating body 502, so that when gas or water is ejected from the channel 514, the rotating body 502 is driven to rotate. The connection between the pipeline and the rotating body 502 can adopt the existing technology. In this embodiment, a T-shaped sleeve 515 is fixed on the outer side of the pipeline, and the rotating body 502 is sleeved on the sleeve 515. A connecting hole communicating with the internal channel 514 of the rotating body 502 is opened in the sleeve 515, and the sleeve 515 below the connecting hole is closed. A circular nut 516 is welded to the upper end of the sealing plate 511, and the nut is threadedly connected and fixed to the outer wall of the sleeve 515, so that the rotation of the rotating body 502 is limited between the T-shaped sleeve 515 and the sealing plate 511. The microporous aeration tube 501 used produces small bubbles, so the buoyancy is small and the bubbles stay in the water for a long time. At the same time, the range of the bubbles produced is also small. In this embodiment 2, the rotating body 502 is modified. The rotating body 502 is separately connected to high-pressure air or high-pressure water flow, so that after the air or water flow is ejected from the rotating body 502, it drives the surrounding water flow to move horizontally, and the produced tiny bubbles are sent to a farther range, thereby achieving a better aeration effect.

[0036] In the above embodiment, the water treated by the biological filter 3 meets the standards and is discharged. The shellfish ecological filter at the end is provided with a filter 6 and is connected to the discharge pump station. The drainage pump station connects the main water collection tank 7 and the auxiliary water tank 8. The main water collection tank 7 and the auxiliary water tank 8 are both connected to the biological filter 3. A connecting port 9 is provided between the auxiliary water tank 8 and the main water collection tank 7. The filter 6 is arranged on the main water collection tank 7 and extends from the connecting port 9 to the auxiliary water tank. An outlet 10 is provided between the end of the auxiliary water tank and the main water collection tank. A filter is provided at the outlet 10. A sluice gate 12 is provided between the connecting port 9 and the outlet 10 of the auxiliary water collection tank. A step 11 is provided between the connecting port 9 and the outlet 10 of the main water collection tank 7 so that the water level of the main water collection tank 7 corresponding to the outlet 10 is lower than the bottom of the auxiliary water tank 8. The purpose of the filter 6 is to intercept microalgae or some organisms. This embodiment is provided with a filter screen 6 of a relatively long length, and a counterweight can be provided at the bottom of the filter screen 6 and placed in a groove. After the filter screen 6 has been used for a period of time, the filter screen 6 that is not immersed in water is pulled into the main water collection tank 7 by pulling the filter screen 6, and the used filter screen 6 enters the auxiliary water tank 8 from the connecting port 9, and is pulled to the outside from the wall of the auxiliary water tank 8. The material that is disturbed and falls by the wall of the auxiliary water tank 8 is flowed downstream along the auxiliary water tank 8 by the water flow of the auxiliary water tank 8, and flows into the main water collection tank 7 through the filter screen at the water outlet 10, thereby realizing the replacement of the filter screen 6 without stopping the water. When replacing the filter screen at the water outlet 10, close the sluice gate of the auxiliary water tank 8. Since there is a step 11 in front of the water outlet 10 of the main water collection tank 7, the water surface is lower than the bottom of the auxiliary water tank 8. After draining the water in the rear section of the auxiliary water tank 8, replace the filter screen.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ecological treatment module of an ecological tailwater treatment system, characterized in that: The invention comprises a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter. The supernatant water treated by the preceding treatment process passes through the salt-tolerant surface flow wetland to treat water-soluble organic matter in the water, and then flows into the microalgae purification pond to absorb salts in the water. An aeration device is arranged in the microalgae purification pond, and the aeration device comprises an aeration hole and an anti-blocking component moving relative to the surface of the aeration hole. The supernatant water then flows into the biological filter to filter and purify the algae, thereby achieving nitrogen and carbon fixation.

2. The ecological treatment module of an ecological tailwater treatment system according to claim 1, characterized in that: The salt-tolerant surface flow wetland is provided with a plurality of blocks, and adjacent salt-tolerant surface flow wetlands are connected end to end through one or a plurality of pipelines.

3. The ecological treatment module of the ecological tailwater treatment system according to claim 2, characterized in that: There are several microalgae purification ponds, and adjacent microalgae purification ponds are arranged in series or in parallel. The biological filter includes multiple shellfish biological filters arranged in series, and the shellfish ecological filter at the end is provided with a filter screen and is connected to the discharge pump station.

4. The ecological treatment module of an ecological tailwater treatment system according to claim 1, characterized in that: The aeration device includes a disc-shaped, parallel or mesh-shaped pipeline arranged at the bottom of the pool, a microporous aeration tube vertically connected to the pipeline, and a plurality of micropores are arranged on the surface of the aeration tube. The anti-blocking component includes a rotating body and a rotating part connected to the rotating body and in contact with the outer surface of the microporous aeration tube.

5. The ecological treatment module of the ecological tailwater treatment system according to claim 4, characterized in that: The upper end of the microporous aeration tube includes a flange, the rotating body includes a bottom plate, the bottom plate is fixedly connected to the flange, a through hole is provided in the middle of the bottom plate, the rotating body includes a rotating shaft, an impeller is provided at one end of the rotating shaft, the impeller is arranged inside the microporous aeration tube, a limiting block matching the bottom plate is fixed on the rotating shaft, a limiting tube is provided on the upper side of the bottom plate, a top plate is provided at the upper end of the limiting tube, and the outer periphery of the top plate is connected to the rotating part.

6. The ecological treatment module of the ecological tailwater treatment system according to claim 4, characterized in that: A sealing plate is provided at the upper end of the microporous aeration tube, the rotating body is sleeved on the sealing plate, the upper part of the rotating body is connected to a pipeline, the pipeline is connected to an air pump or a water pump, an arc-shaped radial channel is provided inside the rotating body, so that when gas or water is ejected from the channel, the rotating body is driven to rotate, and the lower part of the rotating body is connected to a rotating part.

7. The ecological treatment module of an ecological tailwater treatment system according to claim 5 or 6, characterized in that: The rotating part comprises one or more longitudinal strips, adjacent longitudinal strips are spaced a predetermined distance apart, and a portion of the inner side surface of the longitudinal strip is in contact with the outer wall of the microporous aeration tube.

8. The ecological treatment module of the ecological tailwater treatment system according to claim 7, characterized in that: The longitudinal strips are detachably connected to the top plate, and the bottoms of the longitudinal strips are connected with an annular strip or are not provided with an annular strip.

9. The ecological treatment module of the ecological tailwater treatment system according to claim 3, characterized in that: The drainage pump station includes a main water collection tank and an auxiliary water tank, both of which are connected to the biological filter tank, a connecting port is provided between the auxiliary water tank and the main water collection tank, the filter is arranged on the main water collection tank and extends from the connecting port to the auxiliary water collection tank, an outlet is arranged between the end of the auxiliary water collection tank and the main water collection tank, the outlet is provided with a filter, the auxiliary water collection tank is provided with a sluice between the connecting port and the outlet, and the main water collection tank is provided with a step between the connecting port and the outlet so that the water level of the main water collection tank corresponding to the outlet is lower than the bottom of the auxiliary water tank.

10. An ecological treatment module of an ecological tailwater treatment system according to any one of claims 1 to 6, characterized in that: The pre-processing process includes a vortex separation tank, an inclined plate sedimentation tank, a brush treatment tank, a filler denitrification tank, an aerated filler tank and a secondary sedimentation tank.

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