A continuous multi-media filter

Abstract

This application discloses a continuous multi-media filter, belonging to the field of wastewater treatment. It includes a housing; an inlet device for controlling the inflow of water to the housing; a filtration zone containing filter media for filtering the inflow water, located within the housing; an outlet zone separated from the filtration zone by a partition, connected to a water storage tank via a guide pipe, the water storage tank being located at the upper part of the housing; a backwashing device for removing and cleaning a portion of the filter media during filter operation and then returning it to the housing; and an air-lift device for cooperating with the backwashing device to remove a portion of the filter media. The advantage of this application is that it provides a continuous multi-media filter where backwashing does not affect the continuity of filtration operation.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and more specifically, to continuous multi-media filters. Background Technology

[0002] Multi-media filters utilize one or more filter media to force water with high turbidity through a layer of granular or non-granular material of a certain thickness under pressure, effectively removing suspended impurities and clarifying the water. They are commonly used in cooling water treatment, raw water treatment, the paper industry, irrigation, and industrial circulating water treatment. Current filter backwashing processes are performed when filtration is stopped, which affects the continuity of multi-media filter operation and reduces wastewater treatment efficiency. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section above, some embodiments of this application provide a continuous multi-media filter, including:

[0005] case;

[0006] Water inlet device, used to control the amount of water entering the shell;

[0007] The filtration zone, which contains filter media for filtering the incoming water, is located inside the housing.

[0008] The water outlet area is separated from the filtration area by a partition. The water outlet area is connected to the water storage tank through a water guide pipe. The water storage tank is located at the upper part of the shell.

[0009] The backwashing device is used to remove some of the filter media for cleaning during the filter's operation and then transport it back into the housing.

[0010] The air-lift device is used in conjunction with the backwashing device to remove part of the filter media.

[0011] The backwashing device includes a material extraction pipe, a filter media cleaning component connected to the material extraction pipe, a return pipe connected to the filter media cleaning component, and a backwash outlet pipe. The upper part of the filtration zone has an open structure, through which the return material falls back into the filtration zone.

[0012] The air lifting device includes an air pump and an air pipe. One end of the air pipe is connected to the air pump, and the other end is connected to the lower part of the return pipe. The connection between the air pipe and the return pipe is inclined from bottom to top.

[0013] The filtration zone includes a first filtration layer, a second filtration layer, and a third filtration layer. The first filtration layer contains anthracite filter media, the second filtration layer contains mixed filter media, and the third filtration layer contains quartz sand filter media.

[0014] The housing is equipped with a material return and distribution structure, which includes multiple inclined plates at the outlet of the material return pipe, baffles connected to the inclined plates, and a distribution plate located below the inclined plates. The distribution plate is inclined, with one end connected to the housing and the other end connected to the upper end of the third filter layer.

[0015] The water outlet area is located in the middle of the third filter layer, and the partition is inclined; the water storage tank is connected to a water tank outlet pipe.

[0016] The partition plate has an inclination angle of 30°, and the material distribution plate has an inclination angle of 50°.

[0017] The water inlet device includes a water inlet located on the upper part of the housing, a water inlet pipe connected to the water inlet, and a water pump. The water inlet pipe is equipped with a ball valve, a check valve, and a flow meter.

[0018] Valves are installed on the backwash water outlet pipe and the air pipe respectively.

[0019] The beneficial effect of this application is that it provides a continuous multi-media filter that ensures continuous operation and processing efficiency. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0021] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0022] In the attached diagram:

[0023] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0024] Figure 2 This is a rear view of the housing in this application;

[0025] Figure 3 This is a top view of the shell in this application. Detailed Implementation

[0026] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0027] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0028] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0029] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0030] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figure 1-3 As shown, a continuous multi-media filter includes a housing 1, a water inlet device, a filtration zone 2, a water outlet zone 3, a backwashing device 4, an air-lift device 5, and a material return and distribution structure. The water inlet device controls the water inflow into the housing 1. The filtration zone 2 contains filter media for filtering the incoming water. The filtration zone 2 specifically includes a first filter layer 21, a second filter layer 22, and a third filter layer 23. The first filter layer 21 contains anthracite filter media, which mainly uses a particle size of 0.8-1.0 mm and a bulk density of 0.95 T / m³. 3 Anthracite is processed into filter media through crushing, screening, and washing. The third filter layer 23 contains quartz sand filter media, primarily with a particle size of 0.5-0.8 mm and a bulk density of 1.75 T / m³. 3Quartz sand is processed into filter media through crushing, screening, and washing. The second filter layer 22 contains mixed filter media, which is a mixture of anthracite and quartz sand filter media. The backwashing device 4 is used to extract and clean a portion of the filter media during operation, then return it to the housing 1. The air-lift device 5 works in conjunction with the backwashing device 4 to extract a portion of the filter media. During filtration, the air-lift device 5 creates a negative pressure at the bottom of the filtration zone, causing the filter media at the bottom to be extracted and cleaned. After being cleaned by the backwashing device 4, the media is returned to the housing. Since only the bottom filter media is extracted, the remaining media can still be used for filtration. Therefore, filtration does not need to be stopped. Backwashing of the filter media and wastewater filtration occur simultaneously, ensuring continuous operation of the multi-media filter and greatly improving wastewater filtration efficiency.

[0032] like Figure 1 The backwashing device 4 includes a material extraction pipe 41, a filter media cleaning component, a return pipe 42, and a backwash outlet pipe 43. The material extraction pipe 41 is vertically mounted on the side wall of the housing. The upper parts of the first filter layer 21, the second filter layer 22, and the third filter layer 23 are all open, and their lower parts are connected. The lower part of the material extraction pipe 41 is connected to the filtration zone, allowing the filter media in the first filter layer 21, the second filter layer 22, and the third filter layer 23 to be extracted from the filtration zone 2 by the material extraction pipe 41. The return pipe 42 is connected to the filter media cleaning component, and the backwash outlet pipe 43 is connected to the wastewater outlet of the filter media cleaning component. The filter media cleaning component is not shown in the figure and can be a drum structure. After the extracted filter media is cleaned again inside the drum, it is returned to the housing through the return pipe 42. The contaminants detached from the filter media are discharged from the backwash outlet pipe 43 with the water flow. The backwash and distribution structure includes multiple inclined plates 61, baffles 62, and distribution plates 63. The inclined plates 61 are positioned at the outlet of the backwash pipe, with gaps between them. After being washed, the filter media is discharged back into the housing through the backwash pipe and falls onto the inclined plates 61, then drops downwards along the inclined angle. The distribution plate 63 is located below the inclined plates and is inclined. One end of the distribution plate 63 is connected to the housing 1, and the other end is connected to the upper end of the third filter layer 23. Due to the different specific gravities of the filter media, the larger-diameter, lighter anthracite particles will slide further away and fall into the first filtration zone, while the smaller-diameter, heavier quartz sand particles will slide closer and fall into the third filtration zone. The remaining particles that do not fall precisely back into the second filtration zone. This process achieves backwashing while simultaneously sorting the filter media, preventing various filter media from mixing and becoming difficult to separate, ensuring a graded arrangement of filter media from coarse to fine, and improving the filtration effect. Preferably, the sorting plate 63 has an inclination angle of 50°, which results in the best sorting effect.

[0033] Furthermore, the baffle 62 is connected to the inclined plate to prevent the filter material from falling outwards and ensure that the filter material falls onto the distribution plate 63. The air lifting device 5 includes an air pump 51 and an air pipe 52. One end of the air pipe 52 is connected to the air pump 51, and the other end is connected to the lower part of the return pipe 42. The connection between the air pipe 52 and the return pipe 42 is inclined from bottom to top, so that the airflow entering the return pipe 42 will be upward, effectively drawing the filter material into the return pipe 42.

[0034] like Figure 1 , 2 As shown, the water outlet zone 3 is separated from the filtration zone 2 by a partition 31. The water outlet zone 3 is connected to the water storage tank 33 via a water guide pipe 32. The water storage tank 33 is located at the upper part of the shell 1. The water storage tank 32 is connected to a water tank outlet pipe 34, and the liquid level in the water storage tank 32 is higher than the water inlet, that is, higher than the liquid level inside the shell. Water is discharged through pressure difference, eliminating the need for a water pump and saving energy. The backwash water outlet pipe 43 is also positioned lower than the liquid level in the water storage tank 32 to ensure smooth drainage. The water inlet device includes a water inlet 71 located at the upper part of the shell, a water inlet pipe 72 connected to the water inlet, and a water pump 73. The water inlet pipe 72 is equipped with a ball valve 74, a check valve 75, and a flow meter 76 to control the amount of water entering the tank and ensure the existence of pressure difference. The water outlet zone 3 is located in the middle of the third filtration layer 23, and the partition 31 is inclined. Preferably, the inclination angle of the partition 31 is 30°. Valves are installed on the backwash outlet pipe 43, air pipe 52, water tank outlet pipe 34, and water guide pipe 32 to control the water volume.

[0035] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A continuous multi-media filter, comprising: case; Water inlet device, used to control the amount of water entering the shell; The filtration zone, which contains filter media for filtering the incoming water, is located inside the housing. The water outlet area is separated from the filtration area by a partition. The water outlet area is connected to the water storage tank through a water guide pipe. The water storage tank is located at the upper part of the shell. The backwashing device is used to remove some of the filter media for cleaning during the filter's operation and then transport it back into the housing. An air-lift device is used in conjunction with a backwashing device to remove a portion of the filter media. The backwashing device includes a material extraction pipe, a filter media cleaning element connected to the material extraction pipe, a return pipe connected to the filter media cleaning element, and a backwash outlet pipe. The upper part of the filtration zone has an open structure, through which the return material falls back into the filtration zone. The air-lift device includes an air pump and an air pipe. One end of the air pipe is connected to the air pump, and the other end is connected to the lower part of the return pipe. The connection between the air pipe and the return pipe is inclined from bottom to top. The filtration zone includes a first filtration layer, a second filtration layer, and a third filtration layer. The first filtration layer contains anthracite filter media, the second filtration layer contains mixed filter media, and the third filtration layer contains quartz sand filter media. The housing is equipped with a material return and distribution structure, which includes multiple inclined plates at the outlet of the material return pipe, baffles connected to the inclined plates, and a distribution plate located below the inclined plates. The distribution plate is inclined, with one end connected to the housing and the other end connected to the upper end of the third filter layer. The water outlet area is located in the middle of the third filter layer, and the partition is inclined; the water storage tank is connected to a water tank outlet pipe. The partition plate has an inclination angle of 30°, and the material distribution plate has an inclination angle of 50°.

2. The continuous multi-media filter according to claim 1, characterized in that: The water inlet device includes a water inlet located on the upper part of the housing, a water inlet pipe connected to the water inlet, and a water pump. The water inlet pipe is equipped with a ball valve, a check valve, and a flow meter.

3. The continuous multi-media filter according to claim 1, characterized in that: Valves are installed on the backwash water outlet pipe and the air pipe respectively.

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