Water-change-free ecological cylinder containing pipeline type biological filtration system

Abstract

A water-change-free ecological tank containing a pipeline type biological filtration system comprises a tank body (1), a box body (2) and a filtration assembly (6), and the box body (2) is located in the tank body (1) and fixedly connected with the bottom face of the tank body (1); the filter assembly (6) is located in the box body (2), a first partition plate (3) and a second partition plate (4) which are perpendicular to the bottom surface of the box body (2) are arranged in the box body (2), and the first partition plate (3) and the second partition plate (4) are fixedly connected with the bottom surface of the box body (2); a filter tank (5) is formed between the first partition plate (3) and the second partition plate (4), and filter cotton is placed in the filter tank (5). Most of floating objects, fish manure, residues and other impurities in water are filtered through a filter assembly (6) at the bottom of the ecological tank, the impurities are decomposed in a modified filter material, the purified water flows back into the fish tank through a water outlet pipe, other undecomposed impurities are adsorbed on filter cotton, follow-up centralized cleaning is facilitated, the filter cotton is replaced regularly, and the water quality is improved. Therefore, water in the ecological cylinder is purified.

Description

A water-changing-free ecological tank with a pipeline biological filtration system Technical Field

[0001] The invention belongs to the technical field of eco-aquariums, and in particular relates to a water-changing-free eco-aquarium with a pipeline-type biological filtration system. Background Art

[0002] Nowadays, people always like to keep some pets in their spare time. Fish and turtles are more common pets. Whether raising fish or turtles, they cannot be separated from fish tanks. In the process of raising fish or turtles, changing the water is a rather troublesome thing. If the water is not changed for a long time, there will be a lot of food residues and excrement in the water, as well as a lot of water mold and algae, which will not only reduce the ornamental value but also emit a pungent smell.

[0003] Fish require water for survival, and their survival is naturally closely linked to water quality. Aquarists universally agree that "water quality is the key to fish cultivation," so managing water quality is crucial when it comes to daily aquarium maintenance. Many consumers quickly lose interest in fish farming due to poor water quality management, which results in the fish dying quickly. Market research reveals that rapid mortality in aquariums can be caused by deteriorating water quality, improper tank management, and lack of experience. Therefore, daily water quality management is a crucial yet challenging aspect of aquarium maintenance. Maintaining consistently high water quality requires improved water management.

[0004] Chinese patent application No. 201811457127.0 discloses an environmentally friendly fish tank with automatic water purification. A No. 1 U-shaped tube and a No. 2 U-shaped tube are used to form a communicating device between the No. 1 circulation tank and the fish tank body, and the fish tank body and the No. 2 circulation tank. When heated, since the local water temperature in the No. 1 circulation tank and the No. 2 circulation tank is higher than the water temperature in the fish tank body, convection is formed through the No. 1 circulation port and the No. 2 circulation port, so that the water in the No. 1 circulation tank and the No. 2 circulation tank is transferred to the fish tank body. During the convection, the water at the bottom of the fish tank body enters the No. 1 circulation tank and the No. 2 circulation tank through the No. 1 U-shaped tube and the No. 2 U-shaped tube. The filters and purification box on the No. 1 U-shaped tube and the No. 2 U-shaped tube are used to effectively purify the fish tank water, forming an automatic purification cycle. Without the help of other auxiliary devices, the water in the fish tank is automatically and continuously purified, the water change cycle of the fish tank is extended, and the purpose of environmental protection and water saving is achieved. The present invention has a simple structure, strong practicality, and is easy to use and promote. Chinese patent application No. 202111578556.5 discloses a fish tank water treatment device and a fish tank, comprising: a cavity and a suction source; the cavity has a bottom suction port and a water outlet; the suction source sucks the fluid into the cavity from the bottom suction port, and flows out of the cavity from the water outlet; the bottom suction port is arranged on the side wall of the cavity, and is at least one vertical strip hole; a water retaining member is provided at the strip hole, and the water retaining member can selectively block the lower half of the strip hole; a blocking medium is provided between the bottom suction port and the water outlet or at the water outlet position, so that the fluid flows to the water outlet with resistance. The bottom suction port of the present invention can block the bottom sand or other particulate matter while sucking in feces, food residues and other dirt from the bottom of the fish tank, and adjust the position of the water inlet of the bottom suction port as needed. At the same time, the fluid with resistance can help the dirt to be retained in the cavity, which is convenient for subsequent centralized cleaning.

[0005] The above patents all purify the water in the fish tank by improving the structure of the fish tank body. However, for fish tanks with already formed structures, adding these water purification devices is costly and is not conducive to promotion and use.

[0006] Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a water-changing ecological tank containing a pipeline biological filtration system. The ecological tank has wide versatility and can filter and decompose impurities such as floating objects, fish feces and residual materials in the water. The purified water can be circulated back to the fish tank, realizing internal circulation purification of the water body.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A water-changing-free ecological tank with a pipeline-type biological filtration system includes a tank body, a box body and a filter assembly. The box body is located inside the tank body and is fixedly connected to the bottom surface of the tank body; the filter assembly is located inside the box body, and a first partition and a second partition perpendicular to the bottom surface of the box body are provided inside the box body. The first partition and the second partition are both fixedly connected to the bottom surface of the box body; a filter groove is formed between the first partition and the second partition, and filter cotton is placed in the filter groove.

[0010] Preferably, the filter assembly includes a water pump, a horizontal pipe, a vertical pipe and an outlet pipe. The water pump is located on the left side of the first partition and is fixedly connected to the bottom of the box body. The water inlet of the water pump is connected to the filter tank through a pipe; the horizontal pipe is located at the lower right side of the second partition and is connected to the filter tank through the second partition; the vertical pipe is located at the top of the horizontal pipe, one end of the vertical pipe is connected to the horizontal pipe, and the vertical pipe is perpendicular to the bottom surface of the box body; the outlet pipe is connected to the water outlet of the water pump.

[0011] Preferably, the right side of the first partition is filled with modified filter material, and submerged plants are provided above the modified filter material.

[0012] The submerged plants are selected from one or more of foxtail algae, Malayan pondweed, Vallisneria, and black algae.

[0013] Preferably, the preparation method of the modified filter material comprises the following steps:

[0014] (a) adding in dilute hydrochloric acid to soak after medical stone powder and zeolite powder are mixed, calcining after soaking, and obtaining pre-treatment mixed powder after calcining;

[0015] (b) adding the pretreated mixed powder in step (a) to deionized water, followed by adding chitosan solution, sodium bicarbonate and γ-glycidyloxypropyltrimethoxysilane, stirring to react, filtering and drying after the reaction is completed to obtain a filter material powder;

[0016] (c) uniformly mixing the filter material powder in step (b) with cement, then adding deionized water and mixing uniformly, granulating and forming the mixture, and then calcining the mixture to obtain filter material particles;

[0017] (d) adding the filter material particles in step (c) to the composite bacterial solution, shaking at room temperature for 2-4 hours, adding soluble pentosan after shaking, stirring evenly, adding potassium chloride solution and pentaerythritol tetraacrylate, and performing a cross-linking reaction. After the reaction is completed, filtering and drying at room temperature to obtain the modified filter material.

[0018] Preferably, in step (a), the mass ratio of medical stone powder to zeolite powder is 1:0.5-2; the mass ratio of dilute hydrochloric acid is 3-7%; the soaking time is 2-4 hours; the calcination temperature is 400-600° C., and the calcination time is 1-3 hours.

[0019] Preferably, the mass concentration of the chitosan solution in step (b) is 30-60 g / L; the mass ratio of the pretreated mixed powder, chitosan solution, sodium bicarbonate, and γ-glycidyloxypropyltrimethoxysilane is 50:100-150:5-8:2-4; the stirring reaction temperature is 50-60°C, and the reaction time is 4-6h.

[0020] Preferably, in step (c), the mass ratio of filter material powder to cement and deionized water is 10:1-1.5:2-4; the calcination temperature is 350-500° C., and the calcination time is 2-5 hours.

[0021] Preferably, the composite bacterial solution in step (d) is a mixture of Bacillus subtilis and nitrifying bacteria, and the bacterial concentrations are 3-5×10 10 / mL and 1-2×10 10 / mL; the mass concentration of the potassium chloride is 2-4%; the mass ratio of the filter material particles, soluble pentosan, potassium chloride solution, and pentaerythritol tetraacrylate is 50:3-5:100-200:1-2; the temperature of the cross-linking reaction is 20-30°C, and the reaction time is 5-8h.

[0022] Preferably, the water level of the cylinder is lower than the height of the water outlet pipe, and a detachable sealing cover is provided on the top of the filter tank to facilitate replacement of the filter cotton.

[0023] Preferably, the filter assembly is designed as at least one group, and the shape of the water outlet pipe is an inverted L shape.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The water-changing-free eco-aquarium with a pipeline-type biological filtration system provided by the present invention uses modified filter materials, wherein zeolite and medical stone are subjected to acid treatment and then high-temperature treatment, wherein the acid treatment improves the pore structure of the zeolite and medical stone, and the high-temperature treatment causes certain chemical changes in the crystal structure of the medical stone and zeolite, all of which enhance the adsorption capacity of the medical stone and zeolite; chitosan is then grafted onto the surface of the mixed powder to further improve the loading capacity of the mixed powder; then, cement is added as a binder, and under roasting, sodium bicarbonate decomposes to produce gas, so that the filter material particles form more pore structures, providing a larger attachment area for microorganisms; finally, soluble pentosan is used to embed the microorganisms on the surface of the filter material particles, effectively improving the adhesion of the microorganisms to the filter material surface and increasing the service life of the filter material; and pentosan has good adsorption properties and has a certain adsorption effect on impurities and substances such as ammonia nitrogen in water, thereby accelerating the degradation efficiency of impurities such as fish feces and residual materials in the eco-aquarium by microorganisms.

[0026] (2) The present invention provides a water-changing eco-aquarium containing a pipeline-type biological filtration system. The present invention filters most of the floating objects, fish feces, residual materials and other impurities in the water through the filter assembly at the bottom of the eco-aquarium, and decomposes them in the modified filter material. The purified water flows back to the fish tank through the outlet pipe, and the remaining undecomposed impurities are adsorbed on the filter cotton, which is convenient for subsequent centralized cleaning. By regularly replacing the filter cotton, the water quality in the eco-aquarium can be purified. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic structural diagram of a water-changing-free eco-aquarium containing a pipeline filtration system according to Example 1 of the present invention;

[0028] FIG2 is a top view of the filter assembly in Example 1 of the present invention.

[0029] Among them, 1. cylinder body; 2. box body; 3. first partition; 4. second partition; 5. filter tank; 6. filter assembly; 7. water pump; 8. horizontal pipe; 9; vertical pipe; 10. outlet pipe; 11. modified filter material; 12. filter cotton; 13. water surface. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0031] The medical stone powder was purchased from Hebei Mingzhe Mineral Products Co., Ltd. with a mesh size of 200 mesh; the zeolite powder was purchased from Xinyang Houpu Mining Co., Ltd. with a mesh size of 325 mesh; the chitosan was purchased from Xi'an Prius Bioengineering Co., Ltd. and is water-soluble chitosan with a CAS number of 9012-76-4; the cement is 42.5 ordinary Portland cement; the soluble pentosan was purchased from Shaanxi Panier Biotechnology Co., Ltd. and is soluble pentosan; the Bacillus subtilis was purchased from Cangzhou Huayu Biotechnology Co., Ltd. with a bacterial concentration of 20 billion / g; the nitrifying bacteria was purchased from Hubei Zhongyan Biotechnology Co., Ltd. with a bacterial concentration of 20 billion / g;

[0032] Example 1

[0033] As shown in Figures 1 and 2, a water-changing-free ecological tank containing a pipeline-type biological filtration system includes a tank body 1, a box body 2 and a filter assembly 6. The box body 2 is located inside the tank body 1 and is fixedly connected to the bottom surface of the tank body 1; the filter assembly 6 is located inside the box body 2, and the interior of the box body 2 is provided with a first partition 3 and a second partition 4 perpendicular to the bottom surface of the box body 2. The first partition 3 and the second partition 4 are fixedly connected to the bottom surface of the box body 2; a filter tank 5 is formed between the first partition 3 and the second partition 4, and a filter cotton 12 is placed in the filter tank 5.

[0034] In this embodiment, the filter assembly 6 includes a water pump 7, a horizontal pipe 8, a vertical pipe 9 and a water outlet pipe 10. The water pump 7 is located on the left side of the first partition 3 and is fixedly connected to the bottom of the box body 2. The water inlet of the water pump 7 is connected to the filter tank 5 through a pipe; the horizontal pipe 8 is located at the lower right of the second partition 4 and is connected to the filter tank 5 through the second partition; the vertical pipe 9 is located at the top of the horizontal pipe 8, one end of the vertical pipe 9 is connected to the horizontal pipe 8, and the vertical pipe 9 is perpendicular to the bottom surface of the box body 2; the water outlet pipe 10 is connected to the water outlet of the water pump 7.

[0035] In this embodiment, the right side of the first partition plate 3 is filled with a modified filter material 11 , and a submerged plant is provided above the modified filter material 11 , and the submerged plant is Myriophyllum.

[0036] In this embodiment, the water level 13 of the cylinder is lower than the height of the water outlet pipe 10 , and a detachable sealing cover is provided on the top of the filter tank 5 to facilitate replacement of the filter cotton 12 .

[0037] In this embodiment, the filter assembly 6 is a group, and the shape of the water outlet pipe 10 is an inverted L shape.

[0038] In this embodiment, the preparation method of the modified filter material 11 includes the following steps:

[0039] (a) 100g medical stone powder and 50g zeolite powder were mixed and added into 800mL of 3% dilute hydrochloric acid and soaked for 4h. After soaking, the mixture was calcined at 400°C for 3h to obtain a pre-treated mixed powder.

[0040] (b) 50 g of the pretreated mixed powder in step (a) was added to 500 mL of deionized water, followed by the addition of 100 g of a 60 g / L chitosan aqueous solution, 5 g of sodium bicarbonate, and 2 g of γ-glycidyloxypropyltrimethoxysilane, and the mixture was stirred at 50 ° C for 6 h. After the reaction was completed, the mixture was filtered and dried to obtain a filter material powder;

[0041] (c) 100 g of the filter material powder from step (b) was mixed with 10 g of cement, and then 20 g of deionized water was added and mixed uniformly, followed by granulation and subsequent calcination at 350° C. for 5 h to obtain spherical filter material particles with a particle size of 3-5 mm.

[0042] (d) 50 g of the filter material particles in step (c) were added to 500 mL of a composite bacterial solution, wherein the composite bacterial solution was a mixture of Bacillus subtilis and nitrifying bacteria, and the bacterial concentrations were 3 × 10 10 / mL and 1×10 10 / mL, shake at room temperature for 2h, add 3-5g of soluble pentosan after shaking, stir evenly, add 100g of potassium chloride solution with a mass concentration of 4% and 1g of pentaerythritol tetraacrylate, and carry out cross-linking reaction. The cross-linking reaction temperature is 20°C and the reaction time is 8h. After the reaction is completed, filter and dry at room temperature to obtain the modified filter material.

[0043] We selected healthy domestic goldfish koi, each 4-6 cm in length, and placed 5 of them in the water. We tested the water quality every 10 days and replaced the filter cotton. We tested for 30 days without changing the water except for replenishing evaporated water. The test data is as follows:

[0044] Example 2

[0045] A water-changing-free ecological tank with a pipeline biological filtration system includes a tank body 1, a box body 2 and a filter assembly 6. The box body 2 is located inside the tank body 1 and is fixedly connected to the bottom surface of the tank body 1; the filter assembly 6 is located inside the box body 2, and the inside of the box body 2 is provided with a first partition 3 and a second partition 4 perpendicular to the bottom surface of the box body 2, and the first partition 3 and the second partition 4 are fixedly connected to the bottom surface of the box body 2; a filter groove 5 is formed between the first partition 3 and the second partition 4, and a filter cotton 12 is placed in the filter groove 5.

[0046] In this embodiment, the filter assembly 6 includes a water pump 7, a horizontal pipe 8, a vertical pipe 9 and a water outlet pipe 10. The water pump 7 is located on the left side of the first partition 3 and is fixedly connected to the bottom of the box body 2. The water inlet of the water pump 7 is connected to the filter tank 5 through a pipe; the horizontal pipe 8 is located at the lower right of the second partition 4 and is connected to the filter tank 5 through the second partition; the vertical pipe 9 is located at the top of the horizontal pipe 8, one end of the vertical pipe 9 is connected to the horizontal pipe 8, and the vertical pipe 9 is perpendicular to the bottom surface of the box body 2; the water outlet pipe 10 is connected to the water outlet of the water pump 7.

[0047] In this embodiment, the right side of the first partition 3 is filled with a modified filter material 11 , and a submerged plant is provided above the modified filter material 11 , wherein the submerged plant is Potamogeton malayi.

[0048] In this embodiment, the water level 13 of the cylinder is lower than the height of the water outlet pipe 10 , and a detachable sealing cover is provided on the top of the filter tank 5 to facilitate replacement of the filter cotton 12 .

[0049] In this embodiment, the filter assembly 6 is a group, and the shape of the water outlet pipe 10 is an inverted L shape.

[0050] In this embodiment, the preparation method of the modified filter material 11 includes the following steps:

[0051] (a) 100 g medical stone powder and 200 g zeolite powder were mixed and added into 800 mL of 7% dilute hydrochloric acid and soaked for 2 h. After soaking, the mixture was calcined at 600 ° C for 1 h to obtain a pre-treated mixed powder.

[0052] (b) 50 g of the pretreated mixed powder in step (a) was added to 500 mL of deionized water, followed by the addition of 150 g of a 60 g / L chitosan aqueous solution, 8 g of sodium bicarbonate, and 4 g of γ-glycidyloxypropyltrimethoxysilane, and the mixture was stirred at 60 ° C for 4 h. After the reaction was completed, the mixture was filtered and dried to obtain a filter material powder;

[0053] (c) 100 g of the filter material powder in step (b) was mixed with 15 g of cement, and then 40 g of deionized water was added and mixed uniformly, followed by granulation and subsequent calcination at 500° C. for 2 h to obtain spherical filter material particles with a particle size of 3-5 mm.

[0054] (d) 50 g of the filter material particles in step (c) were added to 500 mL of a composite bacterial solution, wherein the composite bacterial solution was a mixture of Bacillus subtilis and nitrifying bacteria, and the bacterial concentrations were 5 × 10 10 / mL and 2×10 10 / mL, shake at room temperature for 4h, add 5g of soluble pentosan after shaking, stir evenly, add 200g of potassium chloride solution with a mass concentration of 2% and 2g of pentaerythritol tetraacrylate, and carry out cross-linking reaction. The temperature of the cross-linking reaction is 30°C and the reaction time is 5h. After the reaction is completed, filter and dry at room temperature to obtain the modified filter material.

[0055] We selected healthy domestic goldfish koi, each 4-6 cm in length, and placed 5 of them in the water. We tested the water quality every 10 days and replaced the filter cotton. We tested for 30 days without changing the water except for replenishing evaporated water. The test data is as follows:

[0056] Comparative Example 1

[0057] A water-changing-free ecological tank with a pipeline biological filtration system includes a tank body 1, a box body 2 and a filter assembly 6. The box body 2 is located inside the tank body 1 and is fixedly connected to the bottom surface of the tank body 1; the filter assembly 6 is located inside the box body 2, and the inside of the box body 2 is provided with a first partition 3 and a second partition 4 perpendicular to the bottom surface of the box body 2, and the first partition 3 and the second partition 4 are fixedly connected to the bottom surface of the box body 2; a filter groove 5 is formed between the first partition 3 and the second partition 4, and a filter cotton 12 is placed in the filter groove 5.

[0058] In this comparative example, the filter assembly 6 includes a water pump 7, a horizontal pipe 8, a vertical pipe 9 and a water outlet pipe 10. The water pump 7 is located on the left side of the first partition 3 and is fixedly connected to the bottom of the box body 2. The water inlet of the water pump 7 is connected to the filter tank 5 through a pipe; the horizontal pipe 8 is located at the lower right of the second partition 4 and is connected to the filter tank 5 through the second partition; the vertical pipe 9 is located at the top of the horizontal pipe 8, one end of the vertical pipe 9 is connected to the horizontal pipe 8, and the vertical pipe 9 is perpendicular to the bottom surface of the box body 2; the water outlet pipe 10 is connected to the water outlet of the water pump 7.

[0059] In this comparative example, the right side of the first partition 3 is filled with a modified filter material 11 , and a submerged plant is provided above the modified filter material 11 , and the submerged plant is Myriophyllum.

[0060] In this comparative example, the height of the water surface 13 of the cylinder is lower than the height of the water outlet pipe 10 , and a detachable sealing cover is provided on the top of the filter tank 5 to facilitate the replacement of the filter cotton 12 .

[0061] In this comparative example, the filter assembly 6 is a group, and the shape of the water outlet pipe 10 is an inverted L shape.

[0062] In this comparative example, the preparation method of the modified filter material 11 includes the following steps:

[0063] (a) 100 g medical stone powder and 50 g zeolite powder were mixed and then added into 800 mL of 3% dilute hydrochloric acid and soaked for 4 h to obtain a pre-treated mixed powder;

[0064] (b) 100 g of the filter material powder in step (a) was mixed with 10 g of cement, and then 20 g of deionized water was added and mixed uniformly, followed by granulation and subsequent calcination at a temperature of 350° C. for 5 h to obtain filter material particles; the filter material particles were spherical with a particle size of 3-5 mm;

[0065] (c) 50 g of the filter material particles in step (b) were added to 500 mL of a composite bacterial solution, wherein the composite bacterial solution was a mixture of Bacillus subtilis and nitrifying bacteria, and the bacterial concentrations were 3 × 10 10 / mL and 1×10 10 / mL, shaken at room temperature for 2h, filtered after shaking, and dried at room temperature to obtain the modified filter material.

[0066] We selected healthy domestic goldfish koi, each 4-6 cm in length, and placed 5 of them in the water. We tested the water quality every 10 days and replaced the filter cotton. We tested for 30 days without changing the water except for replenishing evaporated water. The test data is as follows:

[0067] From the above data, it can be seen that the water-changing-free eco-aquarium provided by the present invention, which contains a pipeline-type biological filtration system, has a stable pH, total nitrogen, ammonia nitrogen, and dissolved oxygen content in the water after one month, and the water body has no odor and the water quality remains clear, thereby achieving purification of the water quality in the eco-aquarium.

[0068] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A water-changing-free ecological cylinder with a pipeline biological filtration system, comprising a cylinder body (1), a box body (2) and a filter assembly (6), wherein the box body (2) is located inside the cylinder body (1) and is fixedly connected to the bottom surface of the cylinder body (1); the filter assembly (6) is located inside the box body (2), and is characterized in that: A first partition plate (3) and a second partition plate (4) perpendicular to the bottom surface of the box body (2) are provided inside the box body (2); the first partition plate (3), the second partition plate (4) and the bottom surface of the box body (2) are fixedly connected; a filter groove (5) is formed between the first partition plate (3) and the second partition plate (4), and filter cotton (12) is placed in the filter groove (5).

2. The water-changing-free ecological tank containing a pipeline biological filtration system according to claim 1, characterized in that: The filter assembly (6) comprises a water pump (7), a horizontal pipe (8), a vertical pipe (9) and a water outlet pipe (10); the water pump (7) is located on the left side of the first partition (3) and is fixedly connected to the bottom of the box body (2); the water inlet of the water pump (7) is connected to the filter tank (5) through a pipe; the horizontal pipe (8) is located at the lower right of the second partition (4) and passes through the second partition to be connected to the filter tank (5); the vertical pipe (9) is located at the top of the horizontal pipe (8), one end of the vertical pipe (9) is connected to the horizontal pipe (8), and the vertical pipe (9) is perpendicular to the bottom surface of the box body (2); the water outlet pipe (10) is connected to the water outlet of the water pump (7).

3. The water-changing-free ecological tank containing a pipeline-type biological filtration system according to claim 1, characterized in that: The right side of the first partition plate (3) is filled with a modified filter material (11), and submerged plants are also arranged above the modified filter material (11).

4. The water-changing-free ecological tank containing a pipeline-type biological filtration system according to claim 3, characterized in that: The preparation method of the modified filter material (11) comprises the following steps: (a) Mix medical stone powder and zeolite powder evenly and add them to dilute hydrochloric acid for soaking. Calcination is performed to obtain a pre-treated mixed powder after the calcination is completed; (b) adding the pretreated mixed powder in step (a) into deionized water, and then adding chitosan solution, sodium bicarbonate and γ-glycidyloxypropyltrimethoxysilane, stirring to react, filtering and drying after the reaction is completed to obtain filter material powder; (c) mixing the filter material powder in step (b) with cement, adding deionized water and mixing evenly, granulating and forming, and then calcining to obtain filter material particles; (d) adding the filter material particles in step (c) to the composite bacterial solution, shaking at room temperature for 2-4 hours, adding soluble pentosan after shaking, stirring evenly, adding potassium chloride solution and pentaerythritol tetraacrylate to carry out cross-linking reaction, filtering after the reaction is completed, and drying at room temperature to obtain the modified filter material.

5. The water-changing-free ecological tank containing a pipeline-type biological filtration system according to claim 4, characterized in that: The mass ratio of medical stone powder to zeolite powder in step (a) is 1:0.5-2; the mass ratio of dilute hydrochloric acid is 3-7%; the soaking time is 2-4h; the calcining temperature is 400-600°C, and the calcining time is 1-3h.

6. The water-changing-free ecological tank containing a pipeline biological filtration system according to claim 4, characterized in that: The mass concentration of the chitosan solution in step (b) is 30-60 g / L; the mass ratio of the pretreated mixed powder, chitosan solution, sodium bicarbonate, and γ-glycidyloxypropyltrimethoxysilane is 50:100-150:5-8:2-4; the stirring reaction temperature is 50-60° C., and the reaction time is 4-6 h.

7. The water-changing-free ecological tank with a pipeline biological filtration system according to claim 4, characterized in that: In step (c), the mass ratio of filter material powder to cement deionized water is 10:1-1.5:2-4; the calcination temperature is 350-500° C., and the calcination time is 2-5 hours.

8. The water-changing-free ecological tank with a pipeline biological filtration system according to claim 4, characterized in that: The composite bacterial solution in step (d) is a mixture of Bacillus subtilis and nitrifying bacteria, and the bacterial concentrations are 3-5×10 10 / mL and 1-2×10 10 / mL; the mass concentration of the potassium chloride is 2-4%; the mass ratio of the filter material particles, soluble pentosan, potassium chloride solution, and pentaerythritol tetraacrylate is 50:3-5:100-200:1-2; the temperature of the cross-linking reaction is 20-30°C, and the reaction time is 5-8h.

9. The water-changing-free ecological tank containing a pipeline-type biological filtration system according to claim 2, characterized in that: The height of the water surface (13) of the cylinder body is lower than the height of the water outlet pipe (10), and a detachable sealing cover is provided on the top of the filter tank (5) to facilitate the replacement of the filter cotton (12).

10. The water-changing-free ecological tank with a pipeline biological filtration system according to claim 2, characterized in that: The filter assembly (6) is designed as at least one group, and the shape of the water outlet pipe (10) is an inverted L shape.

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