Aquaculture tail water treatment method

Abstract

The invention belongs to the field of aquaculture tail water treatment, and provides an aquaculture tail water treatment method which comprises the following steps: S1, settling and intercepting tail water through the front end of an ecological ditch; s2, performing multi-stage purification treatment on the passing tail water through a sedimentation tank, a filter dam I, an aeration tank, a filter dam II, a microalgae membrane tank and an ecological purification tank. Membrane pool medium filtration is adopted, the manufacturing cost is low, popularization is easy, the ecological property is good, and treatment is more efficient; the tail water treatment method has the advantages of saving land occupation, guaranteeing up-to-standard discharge, and aiming at the defects of low nitrogen and phosphorus pollutant treatment efficiency and slow nitrogen and phosphorus purification speed in the prior art, the tail water treatment method can improve the treatment efficiency and guarantee up-to-standard discharge of the culture tail water.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture tail water treatment and relates to an aquaculture tail water treatment method. Background Art

[0002] Aquaculture tailwater is the wastewater generated during the aquaculture process. In order to improve the ecological environment, aquaculture tailwater needs to be treated. The existing aquaculture tailwater treatment method mainly adopts a three-pool and two-dam structure to carry out aquaculture tailwater treatment process.

[0003] The three-pond-two-dam tailwater treatment process mainly involves sedimentation first, followed by aeration, and then purification. The disadvantage of using this method for aquaculture tailwater treatment is the low efficiency of treating pollutants such as nitrogen and phosphorus, and the slow purification speed of nitrogen and phosphorus. Summary of the Invention

[0004] The object of the present invention is to provide a method for treating aquaculture tail water to solve the problems raised in the above background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A method for treating aquaculture tail water comprises the following steps: S1: Settle and intercept tailwater through the front end of the ecological ditch; S2: The tail water is subjected to multi-stage purification treatment through sedimentation tank, filter dam 1, aeration tank, filter dam 2, microalgae membrane pool and ecological purification pool.

[0006] In the above-mentioned aquaculture tailwater treatment method, it includes an ecological ditch, a sedimentation tank, an aeration tank, a microalgae membrane tank and an ecological purification tank. The ecological ditch is connected to the sedimentation tank. A filter dam 1 is fixedly installed between the sedimentation tank and the aeration tank. A filter dam 2 is fixedly installed between the aeration tank and the microalgae membrane tank. An overflow dam is fixedly installed between the microalgae membrane tank and the ecological purification tank. A drainage outlet is opened on one side of the ecological purification tank.

[0007] In the above-mentioned aquaculture tailwater treatment method, an artificial aquatic plant structure, emergent plants, and submerged plants are arranged in the sedimentation tank. The artificial aquatic plant structure includes a plurality of fixed ropes arranged in parallel. The length of the fixed rope is adapted to the length of the adjacent tank wall. Both ends of the fixed rope are fixed with ground-inserted wooden stakes, and the ground-inserted wooden stakes are inserted into the bottom of the sedimentation tank. Artificial aquatic plants are fixed on the fixed ropes.

[0008] In the above-mentioned aquaculture effluent treatment method, the filter dam one and the filter dam two are both composed of a dam body and internal filter material. The dam body is made of porous bricks of building materials, and the internal filter material is a multi-layer filter material structure. The filter material is distributed in a manner that the particle diameter gradually decreases from left to right; the internal filter material includes a large particle filter material layer, a medium particle filter material layer, and a small particle filter material layer.

[0009] In the above-mentioned aquaculture tailwater treatment method, the average particle size of the large particle filter material layer is 13±1 cm, the average particle size of the medium particle filter material layer is 8±1 cm, and the average particle size of the small particle filter material layer is 3±1 cm.

[0010] In the above-mentioned aquaculture tailwater treatment method, the aeration tank has a built-in aerator, and a plurality of aeration holes are installed at the bottom of the aeration tank.

[0011] In the aforementioned aquaculture tailwater treatment method, a multi-media filter is fixedly installed within the microalgae membrane pond. The multi-media filter comprises two membrane media as biofilm carriers: one is a semi-flexible biofiller, and the other is MBBR filler. The semi-flexible biofiller is installed in a steel frame or a flexible rope structure, forming two upper and lower layers. The distance between the two layers is the effective length of the semi-flexible filler. The MBBR filler is distributed in batches and spread to the bottom of the pond, with the amount distributed accounting for approximately 10% of the pond volume.

[0012] In the above-mentioned method for treating aquaculture tail water, emergent plants and submerged plants are planted in the ecological purification pool, the water outlet of the ecological purification pool is connected to an external ditch through a bellows, a microalgae culture area is fixedly provided on one side of the ecological purification pool, and a cylindrical microalgae culture tube is fixedly provided inside the microalgae culture area. After the culture is completed, the microalgae bacteria are sprinkled into the microalgae membrane pool to purify the aquaculture tail water.

[0013] Compared with the prior art, the advantages of the aquaculture tail water treatment method of the present invention are: A method for treating aquaculture tailwater adopts membrane pool media filtration, which is low in cost, easy to promote, ecologically friendly, and more efficient; it saves space and can ensure that discharge meets standards; and it addresses the shortcomings of the existing technology of low nitrogen and phosphorus pollutant treatment efficiency and slow nitrogen and phosphorus purification speed. This tailwater treatment method can improve treatment efficiency and ensure that aquaculture tailwater discharge meets standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a process flow chart of a method for treating aquaculture tail water according to the present invention; Figure 2 This is a schematic diagram of the layout of artificial aquatic plants in a sedimentation tank of an aquaculture tailwater treatment device according to the present invention; Figure 3This is a schematic structural diagram of an aquaculture tailwater treatment device according to the present invention; Figure 4 This is a schematic cross-sectional structural diagram of a first filter dam and a second filter dam of an aquaculture tailwater treatment device according to the present invention; Figure 5 This is a schematic structural diagram of a multi-media filter in a microalgae membrane pool of an aquaculture tailwater treatment device according to the present invention; Figure 6 This is a schematic diagram of the structure of a semi-soft biological filler of a multi-media filter of an aquaculture tailwater treatment device according to the present invention; Figure 7 This is a schematic diagram of the MBBR filler structure of a multi-media filter in an aquaculture tailwater treatment device of the present invention.

[0015] In the figure: 1. Ecological ditch; 2. Sedimentation tank; 3. Filter dam 1; 301. Dam body; 302. Internal filter material; 303. Large particle filter material layer; 304. Medium particle filter material layer; 305. Small particle filter material layer; 4. Aeration tank; 5. Filter dam 2; 6. Microalgae membrane tank; 7. Ecological purification tank; 8. Artificial aquatic plant structure; 801. Ground-insulated wooden stakes; 802. Fixing rope; 803. Artificial aquatic plants; 9. Aerator; 10. Overflow dam; 11. Multi-media filter; 12. Drainage outlet. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0017] Example 1 according to Figure 1 As shown, the present invention discloses a method for treating aquaculture tail water, comprising the following steps: S1: Settle and intercept tailwater through the front end of the ecological ditch; S2: The tail water is subjected to multi-stage purification treatment through sedimentation tank, filter dam 1, aeration tank, filter dam 2, microalgae membrane pool and ecological purification pool.

[0018] Specifically, the patent application of this invention adopts the structural design of ecological ditch and four pools and two dams. The tail water first enters the sedimentation tank through the ecological ditch for sedimentation pretreatment to remove large suspended particles. The sedimentation tank has the best effect in removing TSS. Then, the tail water is further removed and decomposed by the filter dam. The filter dam has a good removal effect on various water quality indicators. It reaches the aeration tank, and the COD in the tail water is removed through oxidation, volatilization, decomposition and other processes in the aeration tank. MnThe tail water in the aeration tank flows into the microalgae membrane pool, and is filtered through the multi-media filter in the microalgae membrane pool. The tail water after filtration flows into the ecological purification pool. The ecological purification pool mainly reduces the total nitrogen TN and total phosphorus TP content. By planting aquatic plants and ecological floating islands, a comprehensive three-dimensional ecological niche treatment system is constructed to effectively reduce the nitrogen and phosphorus concentrations in the water body and ensure that the aquaculture tail water meets the discharge standards.

[0019] Example 2 according to Figure 2-Figure 7 As shown, the patent application of the present invention discloses an aquaculture tail water treatment device used in the aquaculture tail water treatment method in Example 1; It includes an ecological ditch 1, a sedimentation tank 2, an aeration tank 4, a microalgae membrane pool 6 and an ecological purification pool 7. The ecological ditch 1 is connected to the sedimentation tank 2. A filter dam 3 is fixedly installed between the sedimentation tank 2 and the aeration tank 4. A filter dam 5 is fixedly installed between the aeration tank 4 and the microalgae membrane pool 6. An overflow dam 10 is fixedly installed between the microalgae membrane pool 6 and the ecological purification pool 7. A drain outlet 12 is opened on one side of the ecological purification pool 7.

[0020] Specifically, the aquaculture tailwater treatment device is used to treat the aquaculture tailwater, and membrane pool media filtration is adopted, which has low cost, is easy to promote, has good ecological properties, and is more efficient in treatment; it saves space and can ensure that the discharge meets the standards; in view of the shortcomings of the existing technology of low treatment efficiency of nitrogen and phosphorus pollutants and slow nitrogen and phosphorus purification speed, the tailwater treatment method can improve the treatment efficiency and ensure that the aquaculture tailwater is discharged in accordance with the standards.

[0021] An artificial aquatic plant structure 8, emergent plants and submerged plants are provided in the sedimentation tank 2. The artificial aquatic plant structure 8 includes multiple fixed ropes 802 arranged in parallel. The length of the fixed ropes 802 is adapted to the length of the adjacent tank wall. Both ends of the fixed ropes 802 are fixed with ground-inserted wooden stakes 801. The ground-inserted wooden stakes 801 are inserted into the bottom of the sedimentation tank 2, and artificial aquatic plants 803 are fixed on the fixed ropes 802.

[0022] Specifically, the floating objects are filtered by the artificial aquatic plant structure 8 .

[0023] Filter dam 1 3 and filter dam 2 5 are both composed of a dam body 301 and internal filter material 302. The dam body 301 is made of porous bricks of building materials, and the internal filter material 302 is a multi-layer filter material structure. The filter material is distributed with the particle diameter gradually decreasing from left to right; the internal filter material 302 includes a large particle filter material layer 303, a medium particle filter material layer 304, and a small particle filter material layer 305; among them, the average particle size of the large particle filter material layer 303 is 13±1cm, the average particle size of the medium particle filter material layer 304 is 8±1cm, and the average particle size of the small particle filter material layer 305 is 3±1cm.

[0024] Specifically, the internal filter material 302 is magnetic sand filter material.

[0025] The aeration tank 4 has an internal aerator 9 , and a plurality of aeration holes are installed at the bottom of the aeration tank 4 , and aeration treatment is performed through the aerator 9 .

[0026] A multi-media filter 11 is fixedly installed in the microalgae membrane pool 6. The multi-media filter 11 is provided with two membrane media as biofilm carriers, one of which is a semi-soft biological filler and the other is an MBBR filler.

[0027] Specifically, the membrane medium semi-soft biological filler and MBBR filler serve as carriers for the attachment of microalgae. The membrane medium is fixed in series by fixed ropes such as nylon ropes. The outer ends of the ropes are provided with fixed piles nailed into the side walls of the pool. The MBBR filler is added in batches and spread to the bottom of the pool. The amount added is about 10% of the pool volume.

[0028] An overflow dam 10 is provided between the microalgae membrane pool 6 and the ecological purification pool 7 , and a gate is installed on the overflow dam 10 for regulating the flow of water.

[0029] Emergent plants and submerged plants are planted in the ecological purification pool 7. The qualified water source of the ecological purification pool 7 is discharged into the external ditch from the outlet through the overflow port or the pipe connection. A microalgae cultivation area is fixedly provided on one side of the ecological purification pool 7. A cylindrical microalgae cultivation tube is fixedly provided inside the microalgae cultivation area. After the cultivation is completed, the microalgae bacteria are sprinkled into the microalgae membrane pool 6 for purification of the aquaculture tail water.

[0030] Matters not described in detail in this specification constitute prior art known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A method for treating aquaculture tail water, characterized in that: The following steps are involved: S1: Settle and intercept tailwater through the front end of the ecological ditch; S2: The tail water is subjected to multi-stage purification treatment through sedimentation tank, filter dam 1, aeration tank, filter dam 2, microalgae membrane pool and ecological purification pool.

2. An aquaculture tailwater treatment device, characterized in that: The aquaculture tailwater treatment device described in claim 1 comprises an ecological ditch (1), a sedimentation tank (2), an aeration tank (4), a microalgae membrane tank (6) and an ecological purification tank (7), wherein the ecological ditch (1) is connected to the sedimentation tank (2), a filter dam (3) is fixedly installed between the sedimentation tank (2) and the aeration tank (4), a filter dam (5) is fixedly installed between the aeration tank (4) and the microalgae membrane tank (6), an overflow dam (10) is fixedly installed between the microalgae membrane tank (6) and the ecological purification tank (7), and a drain outlet (12) is provided on one side of the ecological purification tank (7).

3. The aquaculture tailwater treatment device according to claim 2, characterized in that: An artificial aquatic plant structure (8), emergent plants, and submerged plants are arranged in the sedimentation tank (2). The artificial aquatic plant structure (8) includes a plurality of fixed ropes (802) arranged in parallel. The length of the fixed ropes (802) is adapted to the length of the adjacent tank wall. Both ends of the fixed ropes (802) are fixed with ground-inserted wooden stakes (801). The ground-inserted wooden stakes (801) are inserted into the bottom of the sedimentation tank (2). Artificial aquatic plants (803) are fixed to the fixed ropes (802).

4. The aquaculture tailwater treatment device according to claim 2, characterized in that: The filter dam 1 (3) and the filter dam 2 (5) are both composed of a dam body (301) and internal filter material (302). The dam body (301) is made of porous bricks, and the internal filter material (302) is a multi-layer filter material structure. The filter material is distributed in a manner such that the particle diameter gradually decreases from left to right. The internal filter material (302) includes a large particle filter material layer (303), a medium particle filter material layer (304), and a small particle filter material layer (305).

5. The aquaculture tailwater treatment device according to claim 4, characterized in that: The average particle size of the large particle filter material layer (303) is 13±1 cm, the average particle size of the medium particle filter material layer (304) is 8±1 cm, and the average particle size of the small particle filter material layer (305) is 3±1 cm.

6. The aquaculture tailwater treatment device according to claim 2, characterized in that: The aeration tank (4) has a built-in aerator (9), and a plurality of aeration holes are installed at the bottom of the aeration tank (4).

7. The aquaculture tailwater treatment device according to claim 2, characterized in that: A multi-media filter (11) is fixedly installed in the microalgae membrane pool (6), and the multi-media filter (11) is provided with two membrane media as biofilm carriers, one of which is a semi-soft biological filler, and the other is an MBBR filler.

8. The aquaculture tailwater treatment device according to claim 2, characterized in that: Emergent plants and submerged plants are planted in the ecological purification pool (7). The water outlet of the ecological purification pool (7) is connected to an external ditch through a corrugated pipe. A microalgae culture area is fixedly provided on one side of the ecological purification pool (7). A cylindrical microalgae culture tube is fixedly provided inside the microalgae culture area. After the culture is completed, the microalgae bacteria are sprinkled into the microalgae membrane pool (6) for purification of the aquaculture tail water.

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