An ecological treatment module for an ecological tailwater treatment system

Abstract

The application discloses an ecological treatment module of an ecological tail water treatment system, which comprises a salt-resistant surface flow wetland, a microalgae purification pond and a biological filter tank. Supernatant water treated by a previous treatment process is used to treat water soluble organic matters in water in the salt-resistant surface flow wetland, 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 a blockage prevention assembly moving relative to the surface of the aeration hole. Then, the water flows into the biological filter tank to filter and purify the algae, so as to realize nitrogen fixation and carbon fixation. The ecological module of the ecological tail water treatment system is high in efficiency, energy-saving, good in treatment effect and less likely to cause blockage of the aeration pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to an ecological treatment module of an ecological tail water treatment system. BACKGROUND

[0002] In the process of factory farming, the farming tail water generated needs to be purified and treated to reach the standard before being recycled or discharged. For many farming sites, they are often established in the suburbs and have a large available land area, which is very suitable for using tail water ecological treatment systems. For example, a new type of farming water in-situ ecological remediation system disclosed in CN 105399286A uses a microalgae purification pond, an algae-eating insect pond that uses microalgae as food, and a fish pond that uses algae-eating insects as food to achieve subsequent treatment of water that has been treated to a certain extent. The present application constructs an ecological tail water treatment device similar to and better than the existing technology. In the prior art, aeration is generally required in the microalgae purification pond, and after the microalgae proliferate, various substances and bacteria are easily attached to the surface of the micro-aeration pipe, causing pipe blockage. SUMMARY

[0003] In view of the above shortcomings, the purpose of the present application is to provide an ecological treatment module for ecological tail water treatment of marine aquaculture with better treatment effect.

[0004] To this end, the ecological treatment module of the ecological tail water treatment system of the present application comprises a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter tank. The supernatant water treated by the previous treatment process is used to treat the water-soluble organic matter in the water in the salt-tolerant surface flow wetland, flows into the microalgae purification pond to absorb salts in the water, the microalgae purification pond is provided with an aeration device, the aeration device comprises an aeration hole and a anti-blocking component moving relative to the surface of the aeration hole, and then flows into the biological filter tank to filter and purify the algae, realizing nitrogen fixation and carbon sequestration.

[0005] Further, the salt-tolerant surface flow wetland is provided with a plurality of blocks, and adjacent salt-tolerant surface flow wetlands are connected in series or in parallel through one or a plurality of pipelines.

[0006] Further, the microalgae purification pond is provided with a plurality of blocks, and adjacent microalgae purification ponds are arranged in series or in parallel, and the biological filter tank comprises a plurality of shellfish biological filter tanks arranged in series, and the last shellfish biological filter tank is provided with a filter screen and is connected with a discharge pump station.

[0007] Further, the aeration device comprises a disc-shaped or parallel or net-shaped pipeline arranged at the bottom of the pond, a micro-porous aeration pipe vertically connected to the pipeline, a plurality of micro-pores arranged on the surface of the aeration pipe, and the anti-blocking component comprises a rotating body and a rotating part connected to the rotating body and in contact with the outer surface of the micro-porous aeration pipe.

[0008] Further, the upper end of the microporous aeration pipe comprises a flange plate, the rotating body comprises a bottom plate fixedly connected with the flange plate, a through hole is arranged in the middle of the bottom plate, the rotating body comprises a rotating shaft, one end of the rotating shaft is provided with an impeller arranged in the interior of the microporous aeration pipe, a limiting block is fixedly arranged on the rotating shaft and matched with the bottom plate, a limiting tube is arranged on the upper side of the bottom plate, a top plate is arranged on the upper end of the limiting tube, and the outer periphery of the top plate is connected with a rotating part.

[0009] The upper end of the microporous aeration pipe is provided with a sealing plate, the rotating body is sleeved on the sealing plate, the upper part of the rotating body is connected with a pipeline, the pipeline is connected with a gas pump or a water pump, the interior of the rotating body is provided with arc-shaped radial holes, so that the rotating body is driven to rotate when gas or water is sprayed from the holes, and the lower part of the rotating body is connected with a rotating part.

[0010] Further, the rotating part comprises one or a plurality of longitudinal strips, adjacent longitudinal strips are spaced apart by a predetermined distance, and a part of the inner side surface of the longitudinal strip is in contact with the outer wall of the microporous aeration pipe.

[0011] Further, the longitudinal strip is detachably connected on the top plate, and the bottom of the longitudinal strip is connected with or not provided with an annular strip.

[0012] Further, the drainage pump station comprises a main water collecting tank and an auxiliary water collecting tank, the main water collecting tank and the auxiliary water collecting tank are both communicated with the biological filter tank, a communication port is arranged between the auxiliary water collecting tank and the main water collecting tank, the filter screen is arranged on the main water collecting tank and extends from the communication port into the auxiliary water collecting tank, a water outlet is arranged between the end of the auxiliary water collecting tank and the main water collecting tank, the water outlet is provided with a filter screen, a water gate is arranged between the communication port and the water outlet of the auxiliary water collecting tank, and a step is arranged between the communication port and the water outlet of the main water collecting tank, so that the water surface of the main water collecting tank corresponding to the water outlet is lower than the tank bottom of the auxiliary water collecting tank.

[0013] Further, the pre-treatment process comprises 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.

[0014] The beneficial technical effects of the present application are as follows:

[0015] The ecological treatment module of the ecological tail water treatment system comprises a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter, and the supernatant water treated by the previous treatment process of 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 is treated by the salt-tolerant surface flow wetland for the treatment of water-soluble organic matters such as phosphate and ammonia nitrogen, and the water body with a medium or low nutrient level is formed by the previous process treatment, the artificial wetland ecological purification technology is suitable for the treatment of the water body with a medium or low nutrient level, and the artificial wetland ecological purification technology has the characteristics of energy saving, low operation cost, no need of professional management, simple operation and maintenance, formation of an ecological landscape effect and the like. The supernatant water flows into the microalgae purification pond for the absorption of nutrient salts, the microalgae purification pond is provided with an aeration device, the contact surface of the generated micro-bubbles with water is extremely large in the water body, the upflowing speed is low, the contact time is long, and the oxygenation effect is good. The full 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 matters such as the sediment at the bottom of the pond and organic debris. The aeration device of the present application comprises a blocking prevention assembly moving relative to the surface of the aeration hole, which can prevent the blocking of the aeration pipe and reduce the influence of the accumulation of algae production and the attachment production of bacteria. The supernatant water flows into the biological filter for filtering and purifying the algae, realizes nitrogen fixation and carbon fixation, and realizes the resource utilization of tail water. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a layout schematic diagram of a specific embodiment of the ecological treatment module of the present application;

[0017] Figure 2 It is a schematic diagram of the bottom aeration assembly;

[0018] Figure 3 It is a schematic diagram of embodiment 1 of the rotating body and the micro-porous aeration pipe;

[0019] Figure 4 It is a connection schematic diagram of the rotating part and the top plate in embodiment 1;

[0020] Figure 5 It is a schematic diagram of embodiment 2 of the rotating body;

[0021] Figure 6 It is a schematic diagram of the internal hole of the rotating body in embodiment 2;

[0022] Figure 7 It is a schematic diagram of the filter device.

[0023] Reference signs: 1, salt-tolerant surface flow wetland; 2, microalgae purification pond; 3, biological filter; 4, aeration pipeline; 5, aeration device; 501, micro-porous aeration pipe; 502, rotating body; 503, flange plate; 504, bottom plate; 505, rotating shaft; 506, impeller; 507, limiting block; 508, limiting pipe; 509, top plate; 510, longitudinal strip; 511, sealing plate; 512, rotating body main body; 513, limiting part; 514, hole; 515, sleeve; 516, circular nut; 6, filter screen; 7, main water collecting tank; 8, auxiliary water tank; 9, communication port; 10, water outlet; 11, step; 12, water gate. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below with reference to the drawings and preferred embodiments.

[0025] Reference Figures 1 to 7 As shown in the figure, the ecological treatment module of the ecological tail water treatment system of the present application includes a salt-tolerant surface flow wetland 1, a microalgae purification pond 2 and a biological filter 3. The supernatant water treated by the pre-treatment process is used to treat the water-soluble organic matter in the water in the salt-tolerant surface flow wetland 1, flows into the microalgae purification pond 2 to absorb the salts in the water, and the microalgae purification pond 2 is provided with an aeration device 5 including aeration holes and a anti-blocking assembly moving relative to the surface of the aeration holes. Then, the water flows into the biological filter 3 to filter and purify the algae, so as to realize nitrogen fixation and carbon sequestration.

[0026] The pre-treatment process described above includes a tail water storage and adjustment tank, two sets of parallelly arranged tail water treatment systems, 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 tail water storage and adjustment tank serves as a primary sedimentation tank. The pre-tail water treatment system described above can adopt the existing technology, which will not be described here in detail. 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.

[0027] The supernatant water flowing out of the secondary sedimentation system enters the ecological treatment module of the present application 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 a plurality of pipelines. The surface flow wetland is divided into a plurality of blocks separated from each other. The overall area of the seawater salt-tolerant plant artificial wetland is 5500 square meters. A natural seawater salt-tolerant plant artificial wetland is formed by domesticating wild emergent plants. The main plants in the wetland are salt-tolerant plants such as bamboo, reed, etc.

[0028] The water after the salt-tolerant surface flow wetland 1 enters the microalgae purification pond 2, and the bottom of the microalgae purification pond 2 is provided with an aeration device 5. The microalgae purification pond 2 is provided with a micro-porous aeration pipe (disc) installed at the bottom, and the generated micro-bubbles have a large contact surface with water, a low upflow velocity, a long contact time, a good oxygenation effect, and 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 sediment and organic debris at the bottom of the pond. Due to the growth of microalgae and bacteria in the microalgae purification pond 2, the micro-porous aeration pipe 501 is more prone to blockage than the ordinary micro-porous aeration pipe 501. A blockage prevention assembly is provided, and the micro-porous aeration pipe 501 is changed into an equal-interval vertical distribution, a rotating body 502 is installed at the upper end of the micro-porous aeration pipe 501, and the surface of the micro-porous aeration pipe 501 is in contact with the rotating body 502 through relative rotation. This movement will disturb the water flow around the micro-porous aeration pipe 501, so that it is not easy to adhere to the surface of the micro-porous aeration pipe 501; secondly, the material adhered to the surface of the micro-porous aeration pipe 501 can be scraped off.

[0029] After flowing out of the microalgae purification pond 2, the water enters the biological filter tank 3. In this embodiment, 20 shellfish filter tanks are constructed, each with a size of 8m*5m, and the water flows through the shellfish filter tanks one by one. The main function is to fully utilize the principle of ecological niche complementation, and the shellfish and other organisms filter and purify algae, realize the functions of nitrogen fixation and carbon fixation, and realize resource utilization of tail water. After the water quality meets the standard, it is recycled to the culture pond or discharged.

[0030] In the above embodiment, as shown in Figure 1 , the salt-tolerant surface flow wetland 1 is provided with a plurality of parallel blocks, which are separated in the middle and connected end to end through one or more pipelines between adjacent salt-tolerant surface flow wetlands 1, that is, one end of each block is provided with a water inlet pipe, and the other end is provided with a water outlet pipe, forming a head-to-tail arrangement, so that the water flows in the length direction of each block, increasing the length of the surface flow. The microalgae purification pond 2 is provided with a plurality of microalgae purification ponds 2, and adjacent microalgae purification ponds 2 are arranged in series or parallel. In this embodiment, a series design is adopted, and the number of microalgae purification ponds 2 is 3.

[0031] In the above embodiment, as shown in Figure 2 , the bottom of the microalgae purification pond 2 is provided with an aeration device 5, which includes a plurality of aeration pipes 4 arranged at equal intervals on the bottom of the pond. Of course, the disc-shaped or net-shaped arrangement on the bottom of the pond can also be used in the prior art. As shown in Figure 3As shown, in the embodiment 1 of the anti-blocking assembly, the upper end of the micro-porous aeration pipe 501 comprises a flange 503, the rotating body 502 comprises a bottom plate 504, the rotating body 502 can be made of plastic material, the bottom plate 504 is provided with a through hole in the middle, the rotating shaft 505 of the rotating body 502 passes through the through hole into the inside of the micro-porous aeration pipe 501, one end of the rotating shaft 505 is provided with an impeller 506, the bottom plate 504 is fixedly connected with the flange 503 such as the commonly used bolt connection, a rubber sealing ring can be arranged between the flange 503 and the bottom plate 504, the rotating shaft 505 is fixedly provided with a limiting block 507 matched with the bottom plate 504, the upper side of the bottom plate 504 is provided with a limiting tube 508, the upper end of the limiting tube 508 is provided with a top plate 509, the top plate 509 is fixedly connected with the other end of the rotating shaft 505, and the outer periphery of the top plate 509 is connected with a rotating part. The aeration pipeline 4 is connected with an air pump, the air pump sends air with a certain pressure into the aeration pipeline 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 micro-porous aeration pipe 501 is also prone to be blocked, in some cases, the rotating part can also be arranged on the rotating shaft inside the pipeline, and a part of the rotating part is in contact with the inner wall of the micro-porous aeration pipe, the working principle and the role of the rotating part arranged outside are basically the same. Referring to Figure 3 and Figure 4 As shown, the rotating part of the embodiment can comprise one or several longitudinal strips 510, the embodiment is L-shaped, adjacent longitudinal strips 510 are apart by a predetermined distance, and a part of the inner side surface of the longitudinal strip 510 is in contact with the outer wall of the micro-porous aeration pipe 501. The longitudinal strip 510 is detachably connected on the top plate 509, and the bottom of adjacent longitudinal strips 510 is connected by an annular strip.

[0032] Referring to Figure 5 and Figure 6As shown, the embodiment 2 of the present application is basically the same as the embodiment 1, the difference is that the upper end of the micro-porous aeration pipe 501 is provided with a sealing plate 511, the rotating body 502 comprises a rotating body main body 512 and a limiting part 513 connected to the rotating body 502, a stepped hole is arranged in the center of the main body of the rotating body 502, the rotating body main body 512 is arranged above the sealing plate 511, and a plurality of limiting parts 513 are connected to the rotating body main body 512 by bolts or buckles, and a rotating part is further connected to the rotating body main body 512, and the limiting parts 513 can be arranged between adjacent rotating parts. The upper part of the rotating body 502 is connected with a pipeline, the pipeline is connected with a gas pump or a water pump, and the inside of the rotating body 502 is provided with an arc-shaped radial hole 514, so that when the gas or water is sprayed from the hole 514, the rotating body 502 is driven to rotate, the connection between the pipeline and the rotating body 502 can adopt the prior art, and the sleeve 515 in the shape of T is fixed outside the pipeline in the embodiment, the rotating body 502 is sleeved on the sleeve 515, the connecting hole communicated with the internal hole 514 of the rotating body 502 is arranged in the sleeve 515, the lower part of the sleeve 515 is closed, the upper end of the sealing plate 511 is welded with a circular nut 516, the nut is threadedly connected and fixed with the outer wall of the sleeve 515, and the rotating body 502 is limited to rotate between the sleeve 515 in the shape of T and the sealing plate 511. The micro-porous aeration pipe 501 is adopted, the generated bubbles are small, so the buoyancy is small, the residence time in water is long, and the range of the generated bubbles is small, the rotating body 502 is modified in the embodiment 2, the high-pressure air or high-pressure water flow is separately connected to the inside of the rotating body 502, so that after the air or water flow is sprayed from the rotating body 502, the surrounding water flow is driven to move transversely, the fine bubbles are sent to a farther range, and better aeration effect is achieved.

[0033] In the above embodiment, the water treated by the biofilter 3 is discharged up to the standard, the end of the shellfish biofilter is provided with a filter screen 6, and is communicated with a discharge pump station. The discharge pump station is connected with a main water collecting tank 7 and an auxiliary water tank 8, the main water collecting tank 7 and the auxiliary water tank 8 are communicated with the biofilter 3, a communication port 9 is arranged between the auxiliary water tank 8 and the main water collecting tank 7, the filter screen 6 is arranged on the main water collecting tank 7 and extends into the auxiliary water tank from the communication port 9, a water outlet 10 is arranged between the end of the auxiliary water tank and the main water collecting tank, the water outlet 10 is provided with a filter screen, a water gate 12 is arranged between the communication port 9 and the water outlet 10 of the auxiliary water tank, and a step 11 is arranged between the communication port 9 and the water outlet 10 of the main water collecting tank 7, so that the water surface of the main water collecting tank 7 corresponding to the water outlet 10 is lower than the tank bottom of the auxiliary water tank 8. The purpose of the filter screen 6 is to intercept microalgae or part of organisms. In the embodiment, a filter screen 6 with a relatively long length is arranged, the bottom of the filter screen 6 can be provided with a counterweight and placed in a groove, when the filter screen 6 is used for a period of time, the filter screen 6 not immersed in water is pulled into the main water collecting tank 7 by pulling the filter screen 6, and the used filter screen 6 enters the auxiliary water tank 8 from the communication port 9 and is pulled to the outside from the wall of the auxiliary water tank 8, the substances disturbed by the wall of the auxiliary water tank 8 fall along the auxiliary water tank 8 in the downstream direction of the auxiliary water tank 8, and flow into the main water collecting tank 7 through the filter screen of the water outlet 10, so that the filter screen 6 is replaced without stopping water. When the filter screen of the water outlet 10 is replaced, the water gate of the auxiliary water tank 8 is closed, because the step 11 exists in front of the water outlet 10 of the main water collecting tank 7, the water surface is lower than the tank bottom of the auxiliary water tank 8, the water in the rear section of the auxiliary water tank 8 is emptied, and then the filter screen is replaced.

[0034] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiment based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. An ecological treatment module for an ecological tailwater treatment system, the module comprising: The application relates to a salt-tolerant surface flow wetland, a microalgae purification pond and a biological filter, wherein supernatant water treated by a pre-treatment process is used to treat water soluble organic matters in water in the salt-tolerant surface flow wetland, is flowed into the microalgae purification pond to absorb salts in the water, the microalgae purification pond is provided with an aeration device, the aeration device comprises aeration holes and an anti-blocking assembly moving relative to the surface of the aeration holes, and the water is then flowed into the biological filter to filter and purify the algae, so as to realize nitrogen fixation and carbon sequestration. The biological filter comprises a plurality of shellfish biological filters arranged in series, the shellfish biological filter at the end is provided with a first filter screen and is communicated with a discharge pump station. The discharge pump station comprises a main water collecting tank and an auxiliary water collecting tank, the main water collecting tank and the auxiliary water collecting tank are communicated with the biological filter, a communication port is arranged between the auxiliary water collecting tank and the main water collecting tank, the first filter screen is arranged on the main water collecting tank and extends into the auxiliary water collecting tank from the communication port, a water outlet is arranged between the end of the auxiliary water collecting tank and the main water collecting tank, the water outlet is provided with a second filter screen, a water gate is arranged between the communication port and the water outlet of the auxiliary water collecting tank, a step is arranged between the communication port and the water outlet of the main water collecting tank, so that the water surface of the main water collecting tank corresponding to the water outlet is lower than the tank bottom of the auxiliary water collecting tank. When the first filter screen is used for a period of time, the first filter screen not immersed in water is pulled into the main water collecting tank by pulling the first filter screen, the used first filter screen is pulled into the auxiliary water collecting tank from the communication port, and is pulled to the outside from the wall of the auxiliary water collecting tank, and the substances falling off due to the disturbance of the wall of the auxiliary water collecting tank are flowed downstream along the water flow of the auxiliary water collecting tank.

2. An ecological treatment module for 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 communicated through one or a plurality of pipelines.

3. An ecological treatment module for an ecological tailwater treatment system according to claim 2, characterized in that: The microalgae purification pond is provided with a plurality of blocks, and adjacent microalgae purification ponds are arranged in series or in parallel.

4. An ecological treatment module for an ecological tailwater treatment system according to claim 1, characterized in that: The aeration device comprises a disc-shaped or parallel or net-shaped pipeline arranged at the bottom of the pond, a micro-porous aeration pipe vertically connected to the pipeline, a plurality of micro-pores arranged on the surface of the aeration pipe, and an anti-blocking assembly comprising a rotating body and a rotating part connected to the rotating body and in contact with the outer surface of the micro-porous aeration pipe.

5. An ecological treatment module for an ecological tailwater treatment system according to claim 4, characterized in that: The upper end of the micro-porous aeration pipe comprises a flange, the rotating body comprises a bottom plate fixedly connected to the flange, a through hole is arranged in the middle of the bottom plate, the rotating body comprises a rotating shaft, one end of the rotating shaft is provided with an impeller arranged in the inside of the micro-porous aeration pipe, a limiting block matched with the bottom plate is fixedly arranged on the rotating shaft, a limiting pipe is arranged on the upper side of the bottom plate, the upper end of the limiting pipe is provided with a top plate, and the outer periphery of the top plate is connected with the rotating part.

6. An ecological treatment module for an ecological tailwater treatment system according to claim 4, wherein: The upper end of the micro-porous aeration pipe is provided with a sealing plate, the rotating body is sleeved on the sealing plate, the upper part of the rotating body is connected with a pipeline, the pipeline is connected with a gas pump or a water pump, arc-shaped radial holes are arranged in the inside of the rotating body, so that the rotating body is driven to rotate when gas or water is sprayed from the holes, and the lower part of the rotating body is connected with the rotating part.

7. An ecological treatment module for an ecological tailwater treatment system according to claim 5 or 6, characterised in that: The rotating part comprises one or a plurality of longitudinal strips, adjacent longitudinal strips are spaced apart by a predetermined distance, and a part of the inner side surface of the longitudinal strip is in contact with the outer wall of the micro-porous aeration pipe.

8. An ecological treatment module for an ecological tailwater treatment system according to claim 7, characterized in that: The longitudinal strip is detachably connected to the top plate, and the bottom part of the longitudinal strip is connected with or not connected with an annular strip.

9. An ecological treatment module for an ecological tailwater treatment system according to any one of claims 1 to 6, characterized in that: The pre-treatment process comprises 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. The pre-treatment process comprises 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.

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