A water change-free ecological tank containing a duct biofilter system

Abstract

The application discloses a water-changing-free ecological tank containing a pipeline type biological filtration system, which comprises a tank body, a box body and a filter assembly. The box body is fixedly connected to the bottom surface of the tank body and is located in the interior of the tank body. The filter assembly is located in the interior of the box body. The interior of the box body is provided with a first partition plate and a second partition plate which are perpendicular to the bottom surface of the box body. The first partition plate and the second partition plate are fixedly connected to the bottom surface of the box body. A filter groove is formed between the first partition plate and the second partition plate. Filter cotton is placed in the filter groove. The filter assembly at the bottom of the ecological tank can filter most of the floating matters, fish feces and residual materials and other impurities in the water, so that the impurities can be decomposed in the modified filter material. The purified water flows back to the fish tank through a water outlet pipe. The remaining undecomposed impurities are adsorbed on the filter cotton, so that the filter cotton can be conveniently cleaned in batches. The filter cotton can be replaced regularly, so that the water quality in the ecological tank can be purified.

Description

Technical Field

[0001] This invention belongs to the field of ecological tank technology, specifically relating to an ecological tank with a pipeline biological filtration system that eliminates the need for water changes. Background Technology

[0002] Nowadays, people often like to keep pets in their spare time, with fish and turtles being the most common. Whether keeping fish or turtles, a fish tank is essential. Changing the water is a troublesome task in the process of raising fish or turtles. If the water is not changed for a long time, there will be a lot of food residue 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] Water is the essential environment for fish to survive, and their survival is closely related to water quality. Anyone who keeps fish agrees that "to keep fish, first keep the water," making water quality management especially crucial in the daily management of aquariums. Many consumers lose interest in keeping fish quickly because they cannot manage water quality, causing their fish to die prematurely. Market research shows that the reasons for rapid fish mortality in aquariums include deteriorating water quality, improper aquarium management, and lack of experience. Therefore, water quality management is a critical yet challenging aspect of daily aquarium management. To maintain good water quality in aquariums, it is essential to improve the quality of water quality management.

[0004] Chinese Patent Application No. 201811457127.0 discloses an environmentally friendly fish tank with automatic water purification. A first and second U-shaped pipe connect a first circulation tank to the fish tank body, and the fish tank body to a second circulation tank, forming a communicating device. During heating, the local water temperature in the first and second circulation tanks is higher than the water temperature in the fish tank body, creating convection through the first and second circulation ports. This allows water from the first and second circulation tanks to flow into the fish tank body. During this convection, water from the bottom of the fish tank body enters the first and second circulation tanks through the first and second U-shaped pipes. The filters and purification boxes on the first and second U-shaped pipes effectively purify the fish tank water, forming an automatic purification cycle. This automatic and continuous purification of the fish tank water does not require other auxiliary devices, extending the water change cycle and achieving the goal of environmental protection and water conservation. This 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 draws fluid into the cavity through the bottom suction port and out of the cavity through the water outlet; the bottom suction port is disposed on the side wall of the cavity and is at least one vertical strip-shaped hole; a water-blocking component is provided at the strip-shaped hole, which can selectively block the lower half of the strip-shaped 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 towards the water outlet with resistance. The bottom suction port of this invention can draw in feces, food residue, and other dirt from the bottom of the fish tank while blocking bottom sand or other particulate matter. The position of the water inlet of the bottom suction port can be adjusted as needed, and the resistance of the fluid helps the dirt to remain in the cavity, facilitating subsequent centralized cleaning.

[0005] The aforementioned patents all purify the water in aquariums by improving the structure of the aquarium itself. However, for aquariums with already established structures, adding these water purification devices would be costly and not conducive to promotion and use. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a water-change-free ecological tank containing a pipeline biological filtration system. This ecological tank is versatile and can filter and decompose impurities such as floating matter, fish feces, and leftover food in the water. The purified water can be circulated back into the fish tank, achieving water circulation purification.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A water-change-free ecological tank with a pipeline 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. The box body has a first partition and a second partition perpendicular to the bottom surface of 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.

[0009] Preferably, the filtration 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 housing. The inlet of the water pump is connected to the filter tank through a pipe. The horizontal pipe is located on the lower right side of the second partition and passes through the second partition to connect to the filter tank. The vertical pipe is located at the top of the horizontal pipe, with one end connected to the horizontal pipe, and the vertical pipe is perpendicular to the bottom surface of the housing. The outlet pipe is connected to the outlet of the water pump.

[0010] Preferably, the right side of the second partition is filled with modified filter material, and submerged plants are placed above the modified filter material.

[0011] The submerged plants are selected from one or more of the following: Myriophyllum spicatum, Potamogeton malaianum, Vallisneria natans, and Hydrilla verticillata.

[0012] Preferably, the method for preparing the modified filter material includes the following steps:

[0013] (a) Mix maifan stone powder and zeolite powder evenly, then soak them in dilute hydrochloric acid. After soaking, calcine them to obtain a pretreated mixed powder.

[0014] (b) Add the pretreated mixed powder from step (a) to deionized water, then add chitosan solution, sodium bicarbonate and γ-glycidyl oxypropyltrimethoxysilane, stir and react, filter and dry after the reaction is complete to obtain filter material powder;

[0015] (c) Mix the filter material powder from step (b) with cement until uniform, then add deionized water and mix until uniform, then granulate and shape, and then calcine to obtain filter material particles;

[0016] (d) Add the filter media particles from step (c) to the composite bacterial solution and shake at room temperature for 2-4 hours. After shaking, add soluble pentosan and stir evenly. Then add potassium chloride solution and pentaerythritol tetraacrylate to carry out the cross-linking reaction. After the reaction is completed, filter and dry at room temperature to obtain the modified filter media.

[0017] Preferably, in step (a), the mass ratio of maifanite 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℃ and the calcination time is 1-3 hours.

[0018] 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-glycidyl etheroxypropyltrimethoxysilane is 50:100-150:5-8:2-4; the temperature of the stirring reaction is 50-60℃, and the reaction time is 4-6 h.

[0019] Preferably, 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℃, and the calcination time is 2-5h.

[0020] Preferably, the composite bacterial solution in step (d) is a mixture of Bacillus subtilis and nitrifying bacteria, with a bacterial concentration of 3-5 × 10⁻⁶. 10 cells / mL and 1-2×10 10 The mass concentration of potassium chloride is 2-4%; the mass ratio of filter media particles, soluble pentosan, potassium chloride solution, and pentaerythritol tetraacrylate is 50:3-5:100-200:1-2; the crosslinking reaction temperature is 20-30℃, and the reaction time is 5-8h.

[0021] Preferably, the water level in the cylinder is lower than the height of the outlet pipe, and the top of the filter tank is provided with a removable sealing cover for easy replacement of the filter cotton.

[0022] Preferably, at least one set of the filter assembly is designed, and the water outlet pipe is in the shape of an inverted L.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The water-free ecological tank with a pipeline biological filtration system provided by the present invention uses modified filter media. Zeolite and maifanite are acid-treated and then high-temperature treated. The acid treatment improves the pore structure of zeolite and maifanite, and the high-temperature treatment causes certain chemical changes in the crystal structure of maifanite and zeolite. These all enhance the adsorption capacity of maifanite and zeolite. Then, chitosan is 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. Under calcination, sodium bicarbonate decomposes to produce gas, which makes the filter media particles form more pore structures, providing a larger attachment area for microorganisms. Finally, soluble pentosan is used to encapsulate the microorganisms on the surface of the filter media particles, which effectively improves the adhesion of microorganisms to the filter media surface and improves the service life of the filter media. In addition, pentosan has good adsorption performance and has a certain adsorption effect on impurities and ammonia nitrogen in the water, thereby accelerating the degradation efficiency of fish feces and residual materials in the ecological tank by microorganisms.

[0025] (2) The water-free ecological tank with a pipeline biological filtration system provided by the present invention filters most of the floating objects, fish feces and other impurities in the water through the filter components at the bottom of the ecological tank, so that they are decomposed in the modified filter media. The purified water flows back to the fish tank through the outlet pipe. 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 ecological tank is purified. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the water-free ecological tank structure containing a pipeline filtration system in Embodiment 1 of the present invention;

[0027] Figure 2 This is a top view of the filtering component in Embodiment 1 of the present invention.

[0028] The components are: 1. Cylinder; 2. Box; 3. First partition; 4. Second partition; 5. Filter tank; 6. Filter assembly; 7. Water pump; 8. Horizontal pipe; 9. Vertical pipe; 10. Water outlet pipe; 11. Modified filter media; 12. Filter cotton; 13. Water surface. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The maifanite powder was purchased from Hebei Mingzhe Mineral Products Co., Ltd., with a mesh size of 200; the zeolite powder was purchased from Xinyang Houpu Mining Co., Ltd., with a mesh size of 325; the chitosan was purchased from Xi'an Puris Bioengineering Co., Ltd., and is water-soluble chitosan, CAS number 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 were purchased from Hubei Zhongyan Biotechnology Co., Ltd., with a bacterial concentration of 20 billion / g; Example

[0031] like Figure 1 , Figure 2 As shown, a water-change-free ecological aquarium 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. The box body 2 has 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 both 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 filter cotton 12 is placed in the filter groove 5.

[0032] 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 2. The inlet of the water pump 7 is connected to the filter tank 5 through a pipe. The horizontal pipe 8 is located on the lower right side of the second partition 4 and passes through the second partition to connect to the filter tank 5. The vertical pipe 9 is located at the top of the horizontal pipe 8, and one end of the vertical pipe 9 is connected to the horizontal pipe 8. The vertical pipe 9 is perpendicular to the bottom surface of the box 2. The water outlet pipe 10 is connected to the water outlet of the water pump 7.

[0033] In this embodiment, the right side of the second partition 4 is filled with modified filter material 11, and a submerged plant, namely Myriophyllum spicatum, is also provided above the modified filter material 11.

[0034] In this embodiment, the water level 13 of the cylinder is lower than the height of the water outlet pipe 10, and the top of the filter tank 5 is provided with a removable sealing cover for easy replacement of the filter cotton 12.

[0035] In this embodiment, the filter assembly 6 is a group, and the water outlet pipe 10 is in the shape of an inverted L.

[0036] In this embodiment, the preparation method of the modified filter material 11 includes the following steps:

[0037] (a) Mix 100g of maifan stone powder and 50g of zeolite powder evenly, then soak them in 800mL of 3% dilute hydrochloric acid for 4h. After soaking, calcine them at 400℃ for 3h. After calcine, the pretreated mixed powder is obtained.

[0038] (b) Add 50g of the pretreated mixed powder from step (a) to 500mL of deionized water, then add 100g of chitosan aqueous solution with a mass concentration of 60g / L, 5g of sodium bicarbonate and 2g of γ-glycidyl oxypropyltrimethoxysilane, and stir the mixture. The stirring temperature is 50℃ and the reaction time is 6h. After the reaction is completed, filter and dry to obtain filter material powder.

[0039] (c) Mix 100g of filter material powder from step (b) with 10g of cement until uniform, then add 20g of deionized water and mix until uniform, then granulate and shape, and then calcine at a temperature of 350℃ for 5h to obtain filter material particles; the filter material particles are spherical with a particle size of 3-5mm.

[0040] (d) Add 50g of filter media particles from step (c) to 500mL of a compound bacterial solution, wherein the compound bacterial solution is a mixture of Bacillus subtilis and nitrifying bacteria, with a bacterial concentration of 3×10⁻⁶. 10 cells / mL and 1×10 10 The mixture was stirred at room temperature for 2 hours, and after the shaking was completed, 3-5 g of soluble pentosan was added. After stirring evenly, 100 g of 4% potassium chloride solution and 1 g of pentaerythritol tetraacrylate were added to carry out the cross-linking reaction. The cross-linking reaction temperature was 20℃ and the reaction time was 8 hours. After the reaction was completed, the mixture was filtered and dried at room temperature to obtain the modified filter material. Example

[0041] A water-change-free ecological aquarium 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. The box body 2 has 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 both 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 filter cotton 12 is placed in the filter groove 5.

[0042] 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 2. The inlet of the water pump 7 is connected to the filter tank 5 through a pipe. The horizontal pipe 8 is located on the lower right side of the second partition 4 and passes through the second partition to connect to the filter tank 5. The vertical pipe 9 is located at the top of the horizontal pipe 8, and one end of the vertical pipe 9 is connected to the horizontal pipe 8. The vertical pipe 9 is perpendicular to the bottom surface of the box 2. The water outlet pipe 10 is connected to the water outlet of the water pump 7.

[0043] In this embodiment, the right side of the second partition 4 is filled with modified filter material 11, and a submerged plant is provided above the modified filter material 11. The submerged plant is Potamogeton malaianus.

[0044] In this embodiment, the water level 13 of the cylinder is lower than the height of the water outlet pipe 10, and the top of the filter tank 5 is provided with a removable sealing cover for easy replacement of the filter cotton 12.

[0045] In this embodiment, the filter assembly 6 is a group, and the water outlet pipe 10 is in the shape of an inverted L.

[0046] In this embodiment, the preparation method of the modified filter material 11 includes the following steps:

[0047] (a) Mix 100g of maifan stone powder and 200g of zeolite powder evenly, then soak them in 800mL of 7% dilute hydrochloric acid for 2h. After soaking, calcine them at 600℃ for 1h. After calcine, the pretreated mixed powder is obtained.

[0048] (b) Add 50g of the pretreated mixed powder from step (a) to 500mL of deionized water, then add 150g of chitosan aqueous solution with a mass concentration of 60g / L, 8g of sodium bicarbonate and 4g of γ-glycidyl oxypropyltrimethoxysilane, and stir the mixture. The stirring temperature is 60℃ and the reaction time is 4h. After the reaction is completed, filter and dry to obtain filter material powder.

[0049] (c) Mix 100g of filter material powder from step (b) with 15g of cement until uniform, then add 40g of deionized water and mix until uniform, then granulate and shape, and then calcine at a temperature of 500℃ for 2 hours to obtain filter material particles; the filter material particles are spherical with a particle size of 3-5mm.

[0050] (d) Add 50g of filter media particles from step (c) to 500mL of a compound bacterial solution, wherein the compound bacterial solution is a mixture of Bacillus subtilis and nitrifying bacteria, with a bacterial concentration of 5×10⁻⁶. 10cells / mL and 2×10 10 The mixture was stirred at room temperature for 4 hours, and after the shaking was completed, 5g of soluble pentosan was added. After stirring evenly, 200g of 2% potassium chloride solution and 2g of pentaerythritol tetraacrylate were added to carry out the cross-linking reaction. The cross-linking reaction temperature was 30℃ and the reaction time was 5 hours. After the reaction was completed, the mixture was filtered and dried at room temperature to obtain the modified filter material.

[0051] A water-change-free ecological aquarium 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. The box body 2 has 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 both 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 filter cotton 12 is placed in the filter groove 5.

[0052] In this comparative example, the filter assembly 6 includes a water pump 7, a horizontal pipe 8, a vertical pipe 9, and an 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 2. The inlet of the water pump 7 is connected to the filter tank 5 through a pipe. The horizontal pipe 8 is located on the lower right side of the second partition 4 and passes through the second partition to connect to the filter tank 5. The vertical pipe 9 is located at the top of the horizontal pipe 8, and one end of the vertical pipe 9 is connected to the horizontal pipe 8. The vertical pipe 9 is perpendicular to the bottom surface of the box 2. The outlet pipe 10 is connected to the outlet of the water pump 7.

[0053] In this comparative example, the right side of the second partition 4 is filled with modified filter material 11, and a submerged plant, namely Myriophyllum spicatum, is placed above the modified filter material 11.

[0054] In this comparative example, the water level 13 of the cylinder is lower than the height of the water outlet pipe 10, and the top of the filter tank 5 is provided with a removable sealing cover for easy replacement of the filter cotton 12.

[0055] In this comparative example, the filter assembly 6 is a group, and the water outlet pipe 10 is in the shape of an inverted L.

[0056] In this comparative example, the preparation method of the modified filter material 11 includes the following steps:

[0057] (a) Mix 100g of maifan stone powder and 50g of zeolite powder evenly, then add 800mL of 3% dilute hydrochloric acid and soak for 4h. After soaking, a pretreated mixed powder is obtained.

[0058] (b) Mix 100g of filter material powder from step (a) with 10g of cement until uniform, then add 20g of deionized water and mix until uniform, then granulate and shape, and then calcine at a temperature of 350℃ for 5h to obtain filter material particles; the filter material particles are spherical with a particle size of 3-5mm.

[0059] (c) Add 50g of filter media particles from step (b) to 500mL of a compound bacterial solution, wherein the compound bacterial solution is a mixture of Bacillus subtilis and nitrifying bacteria, with a bacterial concentration of 3×10⁻⁶. 10 cells / mL and 1×10 10 The sample was shaken at room temperature for 2 hours, and after shaking, it was filtered and dried at room temperature to obtain the modified filter material.

[0060] The water-free ecological tank with a pipeline biological filtration system provided by this invention maintains stable pH, total nitrogen, ammonia nitrogen, and dissolved oxygen levels in the water after one month, and the water is odorless and remains clear, thus achieving water purification in the ecological tank.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water change-free ecological tank containing a duct biofilter system, comprising a tank body (1), a box body (2) and a filter assembly (6), the box body (2) being located inside the tank body (1) and fixedly connected to the bottom surface of the tank body (1); the filter assembly (6) being located inside the box body (2), characterized in that, The inside of the box body (2) is provided with a first partition plate (3) and a second partition plate (4) perpendicular to the bottom surface of 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 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); Wherein, the right side of the second partition plate (4) is filled with modified filter material (11), and the upper side of the modified filter material (11) is further provided with submerged plants; The preparation method of the modified filter material (11) comprises the following steps: (a) After the mixture of medical stone powder and zeolite powder is uniformly mixed, it is soaked in dilute hydrochloric acid, and after the soaking is completed, calcination is carried out, and after the calcination is completed, a pretreated mixed powder is obtained; (b) The pretreated mixed powder in step (a) is added to deionized water, then chitosan solution, sodium bicarbonate and γ-glycidoxypropyltrimethoxysilane are added, and stirring reaction is carried out, and after the reaction is completed, filtration and drying are carried out to obtain filter material powder; (c) The filter material powder in step (b) is uniformly mixed with cement, then deionized water is uniformly mixed, and then granulation and molding are carried out, and then calcination is carried out to obtain filter material particles; (d) The filter material particles in step (c) are added to a composite bacterial solution, and oscillated at room temperature for 2-4h, then soluble pentosan is added, and after stirring, potassium chloride solution and pentaerythritol tetraacrylate are added, and crosslinking reaction is carried out, and after the reaction is completed, filtration and air drying at room temperature are carried out to obtain the modified filter material; The mass ratio of the said maifanshi powder and zeolite powder in step (a) is 1:0.5-2; the mass ratio of the said dilute hydrochloric acid is 3-7%; the said soaking time is 2-4h; the said calcination temperature is 400-600℃, and the calcination time is 1-3h; the mass concentration of the said chitosan solution in step (b) is 30-60g / L; the mass ratio of the said pretreated mixed powder, chitosan solution, sodium bicarbonate and γ-glycidoxypropyltrimethoxysilane is 50:100-150:5-8:2-4; the said stirring reaction temperature is 50-60℃, and the reaction time is 4-6h; the mass ratio of the said filter material powder and cement deionized water in step (c) is 10:1-1.5:2-4; the said calcination temperature is 350-500℃, and the calcination time is 2-5h; the said composite bacteria solution in step (d) is a mixed solution of bacillus subtilis and nitrifying bacteria, and the bacterial concentrations are 3-5×10 10 / mL and 1-2×10 10 / mL, respectively; the mass concentration of the said potassium chloride is 2-4%; the mass ratio of the said filter material particles, soluble pentosan, potassium chloride solution and pentaerythritol tetraacrylate is 50:3-5:100-200:1-2; and the said crosslinking reaction temperature is 20-30℃, and the reaction time is 5-8h.

2. The water change free eco-tank with a biofilter system in a pipe according to claim 1, wherein, The filter assembly (6) comprises a water pump (7), a horizontal pipeline (8), a vertical pipeline (9) and a water outlet pipe (10), the water pump (7) is located on the left side of the first partition plate (3) and is fixedly connected to the bottom of the box body (2), the water inlet of the water pump (7) is connected with the filter groove (5) through a pipeline; the horizontal pipeline (8) is located below the right side of the second partition plate (4) and is connected with the filter groove (5) through the second partition plate; the vertical pipeline (9) is located on the top of the horizontal pipeline (8), one end of the vertical pipeline (9) is connected with the horizontal pipeline (8), and the vertical pipeline (9) is perpendicular to the bottom surface of the box body (2); the water outlet pipe (10) is connected with the water outlet of the water pump (7).

3. The water change free eco-tank with a biofilter system containing a pipe according to claim 2, characterized in that, The water surface (13) of the cylinder body is lower than the height of the water outlet pipe (10), and the top of the filter groove (5) is provided with a detachable sealing cover plate, which is convenient for replacing the filter cotton (12).

4. The water change free eco-tank with a biofilter system containing a pipe according to claim 2, characterized in that, The filter assembly (6) is designed at least in one group, and the shape of the water outlet pipe (10) is inverted L-shaped.

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