A breathing ceramic filter tank and breathing ceramic thereof

Abstract

The application discloses a breathing ceramic filter tank and breathing ceramic thereof. The filter tank comprises a filtering device, a gas-water backwashing device and a water outlet. The filtering device comprises a water inlet and a filter body. The gas-water backwashing device comprises an air inlet, an inclined plate and a ring-shaped air outlet device. The inclined plate is internally provided with an aeration hole. The first end of the inclined plate is arranged between the water inlet and the air inlet. The bottom end of the inclined plate is arranged at the bottom of the filter tank. The filter body is arranged above the inclined plate. The filter body comprises breathing ceramic with a porous structure. The ring-shaped air outlet device and the water outlet are arranged at the bottom of the filter tank. Water flows into the breathing ceramic filter tank from above, and air flows into the breathing ceramic filter tank from below. The contact and exchange of water and air in the breathing ceramic filter tank are increased, so that the removal rate of organic pollutants is greatly improved.

Description

Technical Field

[0001] This application belongs to the field of water treatment technology, and in particular relates to a breathing ceramsite filter and the breathing ceramsite thereof. Background Technology

[0002] Ceramsite filter media is a granular material made from various powdered raw materials that are mixed into a slurry and then processed through a series of processes such as high-temperature firing, crushing, and screening. However, the uneven pore distribution of ceramsite filter media results in large head loss, and it is prone to clogging and caking. Existing ceramsite also suffers from problems such as high specific gravity, low porosity, and low open porosity. On the one hand, this results in a large amount of air consumption for air washing, and on the other hand, it is not conducive to air exchange within the pores of the ceramsite.

[0003] The biological ceramic filter bed currently published under Chinese patent authorization number CN210656330U can perform filtration through a biological ceramic layer and facilitate wastewater treatment by replacing the biological filter layer through some sliding grooves. However, it requires frequent replacement of the contaminated ceramic particles, and the sliding grooves in the water are easily polluted, affecting its operation. Summary of the Invention

[0004] The purpose of this application is to overcome the defects of the prior art and provide a breathing ceramic filter, including a filtration device, an air-water backwashing device and an outlet. The filtration device includes an inlet and a filter body, and the air-water backwashing device includes an air inlet, an inclined plate and an annular air outlet.

[0005] The water inlet is located above the filter tank, the air inlet is located below the filter tank, the inclined plate has aeration holes, the first end of the inclined plate is placed between the water inlet and the air inlet, the bottom end of the inclined plate is placed at the bottom of the filter tank, and the filter body is placed above the inclined plate. The filter body includes breathing ceramic particles, which have a porous structure.

[0006] The annular air outlet and water outlet are located at the bottom of the filter tank.

[0007] Preferably, the upper part of the filter tank is also provided with a water distributor, which is connected to the water inlet.

[0008] Preferably, the filter tank is further provided with an overflow outlet, which is located above the water distributor.

[0009] Preferably, the water distributor includes an inlet channel and a toothed water distribution channel. The inlet channel is connected to the inlet, and the toothed water distribution channel is located at the side end of the inlet channel and connected to the inlet channel. At least one toothed water distribution channel is provided.

[0010] Preferably, the breathable ceramic particles have a porous structure and satisfy at least one of the following characteristics:

[0011] The bulk density of the breathable ceramic particles is 300–800 kg / m³. 3 ;

[0012] The pore size of the breathable ceramic particles is 0.2–5 mm;

[0013] The open porosity of the breathable ceramic particles is 60-90%;

[0014] The porosity of the breathable ceramic particles is 35-80%;

[0015] The particle size range of the breathable ceramic particles is 5–30 mm;

[0016] The density of the breathable ceramic granules after absorbing water is 1020-1100 kg / m³. 3 .

[0017] Preferably, the diameter of the aeration holes is 0.5 to 2 mm.

[0018] Preferably, the inclined plate has a V-shaped structure, the bottom end of the V-shaped structure is connected to the water outlet, and the inclination of the two sides of the V-shaped structure is 3 to 15°.

[0019] Preferably, the filter body further includes pebbles, which are disposed below the breathing ceramic particles. The pebbles include any one or a combination of coarse pebbles and fine pebbles, with the coarse pebbles having a diameter of 20-25 mm and the fine pebbles having a diameter of 5-7 mm.

[0020] This application also provides a breathable ceramic pellet, which includes a breathable ceramic pellet body and a porous structure located in the breathable ceramic pellet body. The porous structure is a spherical pore and includes one or more of closed pores, through pores and blind pores.

[0021] Preferably, the breathable ceramic particles satisfy at least one of the following characteristics:

[0022] The pore size of the breathable ceramic particles is 0.5–2 mm;

[0023] The open porosity of the breathable ceramic particles is 60-90%;

[0024] The porosity of the breathable ceramic particles is 35-80%;

[0025] The particle size range of the breathable ceramic particles is 5–30 mm;

[0026] The density of the breathable ceramic granules after absorbing water is 1020-1100 kg / m³. 3 ...

[0027] Compared with existing technologies, this application has the following significant advantages:

[0028] This application introduces a water flow system where water enters the breathing ceramsite filter from above, flows through the filter body, and then exits through the outlet, increasing the water outflow time. Airflow enters the filter from below, passes through an air-water backwashing device, and then enters the filter body, increasing the contact time and exchange volume between the water and air, creating a breathing effect. This helps increase dissolved oxygen in the water, improves biochemical efficiency, and significantly enhances the removal rate of organic pollutants. Furthermore, the breathing ceramsite in this application has a porous structure, allowing it to fully absorb dissolved oxygen. When saturated with water, the density of the breathing ceramsite is slightly higher than that of water, causing it to float to the surface during low-pressure backwashing, thus improving the exchange efficiency of water and air within the open pores of the breathing ceramsite. Therefore, the breathing ceramsite filter of this application features better permeability, higher hardness, a rougher surface, more micropores, higher porosity, larger specific surface area, lower water flushing energy consumption, and less head loss. It also effectively traps most of the smaller suspended solids, resulting in better water quality. Attached Figure Description

[0029] Figure 1 This is a top view of the breathing ceramsite filter of this application;

[0030] Figure 2 This is a front view of the breathing ceramsite filter of this application;

[0031] Figure 3 This is a schematic diagram of the filter element.

[0032] Figure 4 This is a schematic diagram of the structure of breathable ceramic particles;

[0033] Figure label:

[0034] 1-Water inlet, 2-Air inlet, 3-Overflow outlet, 4-Water outlet, 5-Water distributor, 6-Filter body, 7-Inclined plate, 8-Annular air outlet device, 91-Breathing ceramic pellet body, 92-Sealed hole, 93-Through hole, 94-Blind hole. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] As used herein, "an embodiment" or "an embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. The content of this application can be more readily understood by referring to the following detailed description of preferred embodiments and included examples. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of conflict, the definitions in this specification shall prevail.

[0037] For the purposes of the detailed description below, it should be understood that various alternative variations and sequences of steps may be employed in this application, unless expressly stated otherwise. Furthermore, except in any operational instance, or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term “about.” Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained in this application. At least not in an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be interpreted at least according to the number of reported significant figures and by applying ordinary rounding techniques.

[0038] Although the numerical ranges and parameters described in this application are approximate, the values ​​listed in the specific examples are reported as precisely as possible. However, any numerical value inherently contains some error that is necessarily caused by the standard deviation found in their respective test measurements.

[0039] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to an integer, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included. For example, a specified range from “1 to 10” should be considered to include any and all subranges between the minimum value 1 and the maximum value 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0040] This application provides a breathing ceramsite filter, referenced... Figure 1-2As shown, the system includes a filtration device, an air-water backwashing device, and an outlet 4. The filtration device includes an inlet 1 located above the filter bed and a filter element 6 mounted on an inclined plate 7. The air-water backwashing device includes an air inlet 2 located below the filter bed, an annular air outlet 8, and the inclined plate 7. The inclined plate 7 is inclined inside the filter bed, with one end positioned between the inlet 1 and the air inlet 2, and the bottom end placed at the bottom of the filter bed. Specifically, the bottom end of the inclined plate 7 is connected to the outlet 4 located at the bottom of the filter bed. The inclined plate 7 forms a certain angle with the bottom of the filter bed, providing support for the placement of the filter element 6. Aeration holes are provided in the inclined plate 7 to facilitate the airflow entering from the bottom air inlet 2 to pass through the inclined plate 7 and enter the filter element 6. The filter element 6 includes porous ceramic particles, which provide microspaces for water and air exchange. The annular air outlet is a ring of aeration holes located at the bottom of the filter bed, making the air outlet more uniform.

[0041] In some embodiments, the tilt angle of the inclined plate 7 is 3 to 15°, and further, the tilt angle can also be 5 to 10°.

[0042] In some embodiments, the inclined plate 7 is provided with aeration holes with a diameter of 0.2-5 mm. The inclined plate 7 has a V-shaped structure, with both ends of the V-shaped structure resting against the inner wall of the breathing ceramic filter. The outlet 4 is connected to the lowest end of the V-shaped structure. The inclination angle between the V-shaped structure and the bottom of the filter is 3-15°, and further, the inclination of the V-shaped structure is 5-10°.

[0043] When in use, water flows into the breathing ceramic filter from above, and airflow enters the breathing ceramic filter from below. Because the inclined plate 7 is equipped with aeration holes to allow airflow to pass through, the water flow and airflow achieve contact and exchange between the water and air in the filter.

[0044] In some embodiments, the outlet 4 is connected to the backwash inlet, so that when the ceramsite filter is not in use, the filtered water is pumped into the backwash inlet by the water pump and then into the outlet 4 to clean the filter body 6.

[0045] In some embodiments, reference Figure 4 As shown, the breathable expanded clay aggregate includes a breathable expanded clay aggregate body 91 and a porous structure located within the breathable expanded clay aggregate body 91. The porous structure consists of spherical pores, which can be a single sphere or a pore formed by two or more interconnected spheres. Since the porous structure is formed by foaming with a foaming agent, resulting in spherical or interconnected spheres, it is distributed within the expanded clay aggregate in a foaming manner, making the breathable expanded clay aggregate similar to a semi-rigid foam sponge, thus improving its breathability. The porous structure includes one or more of the following: closed pores 92, through pores 93, and blind pores 94, with a pore diameter of 0.5–2 mm, facilitating the exchange of water and air within the pores. The open porosity of the breathable expanded clay aggregate is 60–90%, and its bulk density in the filter bed is 300–800 kg / m³.3 The density of saturated expanded clay pellets after absorbing water is 1020-1100 kg / m³. 3 Slightly higher than water, it can be backwashed with low-pressure water, resulting in low energy consumption. Furthermore, the breathing ceramic particles will float to the surface during air-water backwashing, improving the porosity of the openings, namely the exchange of water and air in the through holes 93 and / or blind holes 94.

[0046] In some embodiments, the filter body 6 further includes pebbles laid on the inclined plate 7 as a support layer for the breathable expanded clay particles, with the breathable expanded clay particles laid on top. The pebbles include any one or a combination of coarse and fine pebbles, with the coarse pebbles having a diameter of 20-25 cm and the fine pebbles having a diameter of 5-7 mm. (Reference) Figure 3 As shown, the filter body 6 is laid with breathing ceramic particles, fine pebbles and coarse pebbles in sequence from top to bottom.

[0047] In some embodiments, reference Figure 1 As shown, a water distributor 5 is also provided at the top of the filter tank, and the water distributor 5 is connected to the inlet 1. Specifically, the water distributor 5 includes an inlet channel 51 and at least one toothed water distribution channel 52. The inlet channel 51 is connected to the inlet 1, and the toothed water distribution channel 52 is located at the side end of the inlet channel 51 and is connected to the inlet channel 51. Specifically, three long toothed water distribution channels 52 can be provided. By setting up the water distributor 5, the water flow is dispersed into the filter tank, increasing the contact between the water and the air, thereby increasing the dissolved oxygen in the water.

[0048] In some embodiments, to prevent the liquid level from being too high, an overflow port 3 is also provided at the top of the filter tank, and the overflow port 3 is located above the water distributor 5.

[0049] The following describes the preparation method of the respirable ceramsite of this application.

[0050] Preparation Example 1

[0051] S1: Provide 45 parts stone powder, 25 parts quicklime powder, 12 parts gypsum powder, 5 parts foaming agent AC1300, 0.5 parts ceramic reinforcing agent FG-253, 9 parts cement and 3.5 parts water, and mix them to form a slurry.

[0052] S2: The slurry is foamed at 140°C for 6 minutes to set, forming a breathable ceramic material;

[0053] S3: The breathing ceramic material is crushed into granular filter material and screened to obtain breathing ceramic particles with a pore size of 0.5-2mm, a porosity of 52%, an open porosity of 62%, and a particle size of 12-20mm.

[0054] Preparation Example 2

[0055] S1: Provide 40 parts stone powder, 27 parts quicklime powder, 15 parts gypsum powder, 3 parts foaming agent AC1300, 0.7 parts ceramic reinforcing agent FG-253, 10 parts cement and 4.2 parts water, and mix them to form a slurry.

[0056] S2: The slurry is foamed at 135°C for 25 minutes and then set to form a breathable ceramic material;

[0057] S3: The breathable ceramic material is crushed into granular filter media, which is then sieved. The resulting breathable ceramic filter media has a porosity of 69%, an open pore rate of 70%, and a particle size range of 11–16 mm.

[0058] Preparation Example 3

[0059] S1: Provide 29 parts stone powder, 35 parts quicklime powder, 6 parts gypsum powder, 15 parts foaming agent AC1300, 1 part ceramic reinforcing agent FG-253, 9 parts cement and 5 parts water, and mix them to form a slurry.

[0060] S2: The slurry is foamed at 145°C for 7 minutes to set, forming a breathable ceramic material;

[0061] S3: The breathable ceramic material is crushed into granular filter media, which is then sieved. The resulting breathable ceramic filter media has a porosity of 78%, an open pore rate of 85%, and a particle size range of 15-20 mm.

[0062] The following preferred embodiments of this application are listed to further describe the structure of a breathing ceramsite filter.

[0063] Example 1

[0064] The breathing ceramsite filter is provided with an inlet 1 and an overflow 3 at the top, and an air inlet 2 and an outlet 4 at the bottom. A V-shaped inclined plate 7 is provided inside the breathing ceramsite filter, with an inclination angle of 6° between the inclined plate 7 and the bottom of the filter. On the inclined plate 7, a coarse pebble support layer with a diameter of 20-25 mm, a fine pebble support layer with a diameter of 5-7 mm, and the breathing ceramsite prepared in Preparation Example 1 are arranged in sequence.

[0065] A water distributor 5 is installed at the inlet 1 of the breathing ceramsite filter. The water distributor 5 includes three long, toothed water distribution channels 52. After the sewage enters the inlet channel 51 of the water distributor from the inlet 1, it enters the breathing ceramsite filter through the three long, toothed water distribution channels 52. After passing through the filtration system and air-water backwashing device of the filter, the energy consumption of the air-water backwashing device is 0.15 kWh / cycle, and the suspended solids in the effluent are reduced by 94%.

[0066] Example 2

[0067] The breathing ceramsite filter is provided with an inlet 1 and an overflow 3 at the top, and an air inlet 2 and an outlet 4 at the bottom. A V-shaped inclined plate 7 is provided inside the breathing ceramsite filter, with an inclination angle of 10° between the inclined plate 7 and the bottom of the filter. On the inclined plate 7, a coarse pebble support layer with a diameter of 20-25 mm, a fine pebble support layer with a diameter of 5-7 mm, and the breathing ceramsite prepared in Preparation Example 2 are arranged in sequence.

[0068] A water distributor 5 is installed at the inlet 1 of the breathing ceramsite filter. The water distributor 5 includes three long, toothed water distribution channels 52. After the sewage enters the inlet channel 51 of the water distributor from the inlet 1, it enters the breathing ceramsite filter through the three long, toothed water distribution channels 52. After passing through the filtration system and air-water backwashing device of the filter, the energy consumption of the air-water backwashing device is 0.13 kWh / cycle, and the suspended solids in the effluent are reduced by 95%.

[0069] Example 3

[0070] The breathing ceramsite filter is provided with an inlet 1 and an overflow 3 at the top, and an air inlet 2 and an outlet 4 at the bottom. A V-shaped inclined plate 7 is provided inside the breathing ceramsite filter, with an inclination angle of 7° between the inclined plate 7 and the bottom of the filter. On the inclined plate 7, a coarse pebble support layer with a diameter of 20-25 mm, a fine pebble support layer with a diameter of 5-7 mm, and the breathing ceramsite prepared in Preparation Example 3 are arranged in sequence.

[0071] A water distributor 5 is installed at the inlet 1 of the breathing ceramsite filter. The water distributor 5 includes three long, toothed water distribution channels 52. After the sewage enters the inlet channel 51 of the water distributor from the inlet 1, it enters the breathing ceramsite filter through the three long, toothed water distribution channels 52. After passing through the filtration system and air-water backwashing device of the filter, the energy consumption of the air-water backwashing device is 0.14 kWh / cycle, and the suspended solids in the effluent are reduced by 93%.

[0072] Example 4

[0073] An inlet 1 and an overflow 3 are provided at the top of the breathing ceramsite filter, and an air inlet 2 and an outlet 4 are provided at the bottom. An inclined plate 7 is provided inside the breathing ceramsite filter, with one end placed between the inlet 1 and the air inlet 2, and the other end, i.e. the bottom end, of the inclined plate 7 placed at the bottom of the filter. The inclination angle between the inclined plate 7 and the bottom of the filter is 6°. A coarse pebble support layer with a diameter of 20-25 mm, a fine pebble support layer with a diameter of 5-7 mm, and the breathing ceramsite prepared in Preparation Example 1 are sequentially arranged on the inclined plate 7.

[0074] A water distributor 5 is installed at the inlet 1 of the breathing ceramsite filter. The water distributor 5 includes three long, toothed water distribution channels 52. After the sewage enters the inlet channel 51 of the water distributor from the inlet 1, it enters the breathing ceramsite filter through the three long, toothed water distribution channels 52. After passing through the filtration system and air-water backwashing device of the filter, the energy consumption of the air-water backwashing device is 0.2 kWh / cycle, and the suspended solids in the effluent are reduced by 95%.

[0075] The above are merely specific embodiments of this application, but the design concept of this application is not limited thereto. Any non-substantial modifications made to this application using this concept shall be considered as an infringement of the protection scope of this application.

Claims

1. A breathing ceramsite filter, characterized in that, The filter includes a filtration device, an air-water backwashing device, and an outlet (4). The filtration device includes an inlet (1) and a filter body (6). The air-water backwashing device includes an air inlet (2), an inclined plate (7), and an annular air outlet (8). The water inlet (1) is located above the filter tank, the air inlet (2) is located below the filter tank, the inclined plate (7) is provided with aeration holes, the first end of the inclined plate (7) is placed between the water inlet (1) and the air inlet (2), the bottom end of the inclined plate (7) is placed at the bottom of the filter tank, and the filter body (6) is placed above the inclined plate (7). The filter body (6) includes breathing ceramic particles, which have a porous structure. The annular air outlet (8) and the water outlet (4) are located at the bottom of the filter tank.

2. The breathing ceramsite filter according to claim 1, characterized in that, The upper part of the filter tank is also provided with a water distributor (5), which is connected to the water inlet (1).

3. The breathing ceramic granule filter according to claim 2, characterized in that, The filter tank is also provided with an overflow port (3), which is located above the water distributor (5).

4. The breathing ceramsite filter according to claim 2, characterized in that, The water distributor (5) includes an inlet channel (51) and a toothed water distribution channel (52). The inlet channel (51) is connected to the inlet (1). The toothed water distribution channel (52) is located at the side end of the inlet channel (51) and is connected to the inlet channel (51). At least one toothed water distribution channel (52) is provided.

5. A breathing ceramic granule filter according to any one of claims 1-4, characterized in that, The breathable ceramic particles satisfy at least one of the following characteristics. The bulk density of the breathable ceramic particles is 300–800 kg / m³. 3 ; The pore size of the breathable ceramic particles is 0.5–2 mm; The open porosity of the breathable ceramic particles is 60-90%; The porosity of the breathable ceramic particles is 35-80%; The particle size range of the breathable ceramic particles is 5–30 mm; The density of the breathable ceramic granules after absorbing water is 1020-1100 kg / m³. 3 .

6. The breathing ceramic granule filter according to claim 1, characterized in that, The diameter of the aeration holes is 0.2 to 5 mm.

7. A breathing ceramic granule filter according to any one of claims 1 or 6, characterized in that, The inclined plate (7) has a V-shaped structure, and the bottom end of the V-shaped structure is connected to the outlet (4). The inclination of the two sides of the V-shaped structure is 3 to 15°.

8. The breathing ceramsite filter according to claim 1, characterized in that, The filter body (6) also includes pebbles, which are disposed below the breathing ceramic particles. The pebbles include any one or a combination of coarse pebbles and fine pebbles. The coarse pebbles have a diameter of 20-25 mm, and the fine pebbles have a diameter of 5-7 mm.

9. A type of breathable ceramic aggregate, characterized in that, The breathing ceramic pellet includes a breathing ceramic pellet body (91) and a porous structure located in the breathing ceramic pellet body (91). The porous structure is a spherical pore and includes one or more of the following: closed pores (92), through pores (93), and blind pores (94).

10. The breathable ceramic pellets according to claim 9, characterized in that, The breathable ceramic particles satisfy at least one of the following characteristics: The diameter of the spherical hole is 0.5–2 mm; The open porosity of the breathable ceramic particles is 60-90%; The porosity of the breathable ceramic particles is 35-80%; The particle size range of the breathable ceramic particles is 5–30 mm; The density of the breathable ceramic granules after absorbing water is 1020-1100 kg / m³. 3 .

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