Intercepting device and method of filter material for sewage treatment

Abstract

The invention provides an intercepting device and method for a filter material for sewage treatment, and the intercepting device comprises a channel which at least comprises a tank body which is enclosed by a side plate and a bottom plate and is used for liquid to flow along a front-back direction, wherein the two ends of the tank body along the front-back direction are respectively provided with a liquid inlet and a liquid outlet through which the liquid enters and exits; through holes for liquid to pass through are formed in the upper parts of the side plates of the tank body at intervals along the front-back direction; the gas-water baffles are located on the two sides, connected to the tank body and extend in the front-back direction, and the gas-water baffles extend outwards in the left-right direction and incline downwards; the filter material baffles are connected to the tank body and extend in the front-back direction, the filter material baffles are vertically arranged at certain intervals with the tank body, the filter material baffles are located above the gas-water baffles on the corresponding sides and located in the projection of the gas-water baffles in the horizontal direction, and gaps are reserved between the bottom ends of the filter material baffles and the gas-water baffles. According to the intercepting device provided by the invention, the filter tank water inlet and backwashing drainage share the channel, and the filter material loss can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of waste water treatment, and in particular to a filter material interception device and method for waste water treatment. Background Art

[0002] Filtering media is a general term for water treatment filter materials, which are mainly used for filtering domestic sewage, industrial sewage, pure water and drinking water. Filtering media is also often needed in wastewater treatment, which is generally granular material, including quartz sand, gravel, anthracite, pebbles, manganese sand, magnetite filter media, fruit shell filter media, foam filter beads, porcelain sand filter media, ceramsite, garnet filter media, medical stone filter media, sponge iron filter media, activated alumina balls, zeolite filter media, volcanic rock filter media, granular activated carbon, fiber balls, fiber bundle filter media and comet fiber filter media, etc.

[0003] For example, the denitrification filter is a commonly used process in sewage treatment. Its essence is a type of biofilm method, that is, the microorganisms formed in the sewage denitrification process exist on the carrier filter material in the filter tank in the form of biological attachment, and the total nitrogen in the sewage is removed through biochemical reactions.

[0004] According to the different metabolic modes of denitrifying microorganisms, filters can be divided into autotrophic denitrification filters and heterotrophic denitrification filters. Both autotrophic and heterotrophic denitrification filters need to use corresponding carrier filter materials.

[0005] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0006] According to the different water inflow directions of the filter, the filter media can be divided into upward flow and downward flow filters, among which downward flow denitrification filters are the most widely used in practical applications. In the actual operation of some traditional filters, the water inlet channel and the backwash drainage channel enter and discharge through two different channels respectively, which not only easily increases the investment cost of the overall equipment, but also the residual sludge at the bottom of the backwash drainage channel easily causes agglomeration at the bottom of the channel, increasing the workload of manual cleaning.

[0007] At the same time, in order to increase the contact area between wastewater and microorganisms attached to the filter media, the particle size of the filter media is usually relatively small and has a high porosity ratio. Most of the filter media particle sizes are between 1 and 6 mm. Therefore, during the backwashing process of the filter tank, part of the filter media will overflow into the outlet channel with the water flow and be discharged, which causes the filter media to be lost. If no corresponding measures are taken to intercept it, it is necessary to continuously replenish the filter media to ensure the treatment effect of the sewage, thereby increasing the cost of sewage treatment.

[0008] Therefore, a device and method for intercepting filter materials for wastewater treatment are needed to at least partially solve the above technical problems. Summary of the invention

[0009] The embodiment of the present invention provides a filter material interception device and method for waste water treatment, which enables filter tank water inlet and backwash drainage to share the same channel, and can also effectively prevent filter material loss during filter tank backwashing.

[0010] The present invention provides a filter material interception device for waste water treatment, the interception device is used to be arranged in a filter tank containing filter material, and the interception device comprises:

[0011] A channel extending in the front-to-back direction, the channel at least comprising a U-shaped trough body surrounded by a side plate and a bottom plate for liquid to flow in the front-to-back direction:

[0012] Wherein, the two ends of the tank body along the front-to-back direction respectively have a liquid inlet and a liquid outlet for liquid in and out, and the upper part of the side plate of the tank body is provided with through holes for liquid to pass through at intervals along the front-to-back direction;

[0013] Air-water baffles located on both sides and connected to the tank body and extending in the front-to-back direction, the air-water baffles extending outward in the left-right direction and tilting downward; and

[0014] A filter material baffle is connected to the trough body and extends in the front-to-back direction. The filter material baffle is constructed to be arranged vertically at a certain distance from the trough body. The filter material baffle is located above the air-water baffle on the corresponding side and inside the horizontal projection of the air-water baffle, and a gap is left between the bottom end of the filter material baffle and the air-water baffle.

[0015] According to the interception device of the present invention, by adjusting the opening and closing states of the liquid inlet and the liquid outlet, the waste water to be treated can enter the channel through the liquid inlet and then enter the filter tank through the through hole for biochemical treatment. At the same time, when solving the problem that impurities in the waste water are constantly intercepted between the filter materials during the biochemical reaction, when the air-water backwashing device connected to the bottom of the filter tank is turned on, the backwashing air and water flow upward from the bottom of the filter tank, driving the filter materials in the filter tank to expand and rub against each other, thereby cleaning the impurities on the surface of the filter materials. During this period, the filter materials with impurities on the surface cleaned off are blocked by the filter material baffle and return to the filter tank again through the gap between the filter material baffle and the air-water baffle, thereby avoiding the filter materials entering the channel and causing the filter materials to be lost. The backwash wastewater flows slowly through the relatively calm area formed between the filter material baffle and the air-water baffle and enters the channel through the through hole, and is finally discharged from the filter tank through the liquid outlet. After the backwash is completed, the air-water backwash device is closed, and the liquid inlet is adjusted to an open state again. At this time, the liquid outlet is kept open, and the cleaning liquid introduced through the liquid inlet (the waste water to be treated can also continue to be used) enters the channel body to clean the mud remaining at the bottom of the channel during the backwash process, and is discharged from the filter tank through the liquid outlet. The interception device of the present invention can realize that the filter tank water inlet and backwash drainage share the same channel (tank body), and can also effectively prevent the loss of filter material during the backwash of the filter tank, and realize the cleaning of the mud at the bottom of the channel.

[0016] In a second aspect, the present invention further provides a method for intercepting filter material for wastewater treatment, the interception method comprising:

[0017] The liquid outlet is set to a closed state, and the waste water to be treated is introduced into the tank body of the channel through the liquid inlet, and then flows downward into the filter tank through the through hole;

[0018] After the wastewater and the microorganisms attached to the filter media in the filter tank have a biochemical reaction in the filter tank for a period of time, the impurities in the wastewater are continuously intercepted between the filter media, and part of the gas generated during this period is gathered at the connection between the air-water baffle and the bottom plate and discharged into the atmosphere through the exhaust pipe;

[0019] The liquid inlet is adjusted to a closed state, the introduction of waste water is stopped, the liquid outlet is opened, and the air-water backwashing device connected to the bottom of the filter tank is turned on. The backwashing air and water flow upward from the bottom of the filter tank, driving the filter media in the filter tank to expand and rub against each other, thereby cleaning away impurities on the surface of the filter media;

[0020] When the backwashing gas and water flow upward from the bottom of the filter tank, the gas-water baffle and the outer baffle first block most of the filter material driven by the backwashing gas and water from entering the channel. The remaining filter material after crossing the outer baffle will be blocked by the inner baffle, and then naturally settle down and return to the filter tank through the gap between the outer baffle and the gas-water baffle, thus preventing the filter material from entering the channel and causing the filter material to be lost.

[0021] The backwash wastewater without filter media flows slowly through the gap area formed between the inner baffle and the air-water baffle and enters the channel through the through hole, and finally is discharged from the filter tank through the liquid outlet. Part of the gas generated during the backwashing process gathers at the connection between the air-water baffle and the bottom plate and is also discharged into the atmosphere through the exhaust pipe.

[0022] After the backwashing is completed, the air-water backwashing device is closed, and the liquid inlet is adjusted to the open state. At this time, the liquid outlet is kept open, and the cleaning liquid introduced through the liquid inlet enters the tank body of the channel to clean the mud remaining at the bottom of the channel during the backwashing process, and is discharged from the filter tank through the liquid outlet;

[0023] The liquid outlet shall be closed after the mud at the bottom of the channel has been flushed.

[0024] According to the interception method of the present invention, the filter tank water inlet and backwash drainage can share the same channel (tank body), and the filter material loss during the filter tank backwashing process can be effectively prevented, and the mud at the bottom of the channel can be cleaned.

[0025] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0026] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0028] Figure 1 is a schematic diagram of an interception device according to an embodiment of the present invention; the through hole is not shown in the figure;

[0029] Figure 2 It is a side view schematic diagram of an interception device according to an embodiment of the present invention; wherein the structure behind the mounting plate is made transparent;

[0030] Figure 3 is another side view schematic diagram of an interception device according to an embodiment of the present invention; and

[0031] Figure 4 Schematic diagram of a top view of an interception device according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 100. Interception device;

[0034] 110, channel; 111, tank body; 112, side plate; 113, bottom plate; 114, end plate; 115, liquid inlet; 116, liquid outlet; 117, through hole; 118, reinforcing plate;

[0035] 120, air and water baffle; 121, reinforcing rib; 122, supporting plate;

[0036] 131, outer baffle; 132, inner baffle; 133, connecting plate; 134, gap;

[0037] 140. Exhaust pipe;

[0038] 150, mounting plate; 151, bolt hole;

[0039] 210. Filter pool wall;

[0040] 220, water inlet pipe;

[0041] 230. Water outlet pipe. DETAILED DESCRIPTION

[0042] By referring to the exemplary embodiments, the objects and functions of the present invention and the methods for achieving these objects and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0044] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0045] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0046] The present invention provides a filter material interception device for waste water treatment. In a preferred embodiment, reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a schematic diagram of an interception device according to an embodiment of the present invention; the through hole is not shown in the figure; Figure 2 It is a side view schematic diagram of an interception device according to an embodiment of the present invention; wherein the structure behind the mounting plate is made transparent; Figure 3 is another side view schematic diagram of an interception device according to an embodiment of the present invention; Figure 4 1 is a top view schematic diagram of an interception device according to an embodiment of the present invention. The interception device 100 according to the embodiment of the present invention may include a channel 110, an air-water baffle 120 and a filter material baffle.

[0047] For ease of description, the filter tank in this embodiment is taken as an example of a downward flow denitrification filter tank, such as a denitrification denitrification filter tank, but this does not represent a limitation, and other types of filters may also be used. Accordingly, the interception device 100 is preferentially arranged at the top of the filter tank. Microorganisms exist on the carrier filter material in the filter tank in the form of biological attachment, and remove pollutants (such as total nitrogen) in the wastewater to be treated through biochemical reactions.

[0048] Channel 110 is used to receive water from the filter tank and discharge water from the filter tank backwashing, and serves as a transfer mechanism before the waste water to be treated enters the filter tank and before the backwashing waste water is discharged. The air-water baffle 120 is used to block the rise of gas and at least part of the filter material during the filter tank backwashing process, so that the filter material settles in the filter tank after being blocked. The filter material baffle is used to block the filter material lifted from the air-water baffle 120 from entering the channel 110 during the filter tank backwashing process, so that the filter material is blocked and sinks.

[0049] First, for ease of description, the end of the intercepting device 100 provided with the liquid inlet 115 is the front, and the other opposite end (i.e. the end of the intercepting device 100 provided with the liquid outlet 116) is the rear. At the same time, based on facing forward, the left side is the left, and the right side is the right.

[0050] Specifically, the channel 110 extending in the front-to-back direction may include a long U-shaped groove body 111 surrounded by a side plate 112 and a bottom plate 113 for liquid to flow in the front-to-back direction.

[0051] The two ends of the tank body 111 along the front-to-back direction respectively have a liquid inlet 115 and a liquid outlet 116 for liquid to enter and exit. The upper part of the side plate 112 of the tank body 111 is provided with through holes 117 for liquid to pass through at intervals along the front-to-back direction.

[0052] In order to evenly distribute water, the through holes 117 are evenly spaced to the upper portion of the side plate 112 of the tank body 111. Preferably, the plurality of evenly spaced through holes 117 may extend from the front end to the rear end of the side plate 112 of the tank body 111.

[0053] The air-water baffle 120 extending in the front-to-back direction is located on both sides of the tank body 111 and connected to the tank body 111. The air-water baffle 120 extends outward in the left-right direction and tilts downward. The air-water baffle 120 is used in the backwash process of the filter tank to block the rise of gas and filter material, so that the filter material is blocked and settles in the filter tank, which can reduce the rising dead angle area of ​​the backwash filter material and avoid the filter material from getting stuck.

[0054] The filter baffle extending in the front-to-back direction is also located on both sides of the tank body 111 and connected to the tank body 111. The filter baffle is configured to be arranged vertically at a certain distance from the tank body 111. The filter baffle is located above the air-water baffle 120 on the corresponding side and inside the horizontal projection of the air-water baffle 120. A gap 134 is left between the bottom end of the filter baffle and the air-water baffle 120. The gap 134 should be larger than the particle size of the filter material to ensure that the filter material can slide down smoothly and return to the filter tank again.

[0055] Preferably, the lengths of the tank body 111 , the air-water baffle 120 and the filter material baffle along the front-to-back direction are consistent.

[0056] Based on the technical solution described above, the working process of the interception device 100 of the present invention is as follows:

[0057] After a series of process pretreatments are performed before the interception device 100, the waste water to be treated can be lifted by a lifting pump to the liquid inlet 115 of the interception device 100. For example, the liquid inlet 115 is connected to the lifting pump through the water inlet pipe 220, and a valve is provided on the water inlet pipe 220. The liquid outlet 116 can be connected to the water outlet pipe 230, and a corresponding valve is also provided on the water outlet pipe 230.

[0058] The liquid inlet 115 is opened and the liquid outlet 116 is closed, for example, by adjusting the opening and closing of the valves on the water inlet pipe 220 or the water outlet pipe 230, and the waste water to be treated enters the tank body 111 of the channel 110 through the liquid inlet 115, and then enters the filter tank downward through the through holes 117 on the two side walls of the channel 110 for biochemical treatment. After the waste water enters the filter tank, it contacts the denitrifying microorganisms on the filter material during the denitrification and denitrification filter process to remove the corresponding pollutants. As the filtration time increases, the impurities in the waste water are continuously intercepted between the filter materials, which will affect the denitrification effect of the filter tank, so it is necessary to backwash regularly. Before backwashing begins, the liquid inlet 115 needs to be closed and the liquid outlet 116 opened. At this time, the air-water backwashing device connected to the bottom of the filter tank can be opened, and the backwashing air and water flow upward from the bottom of the filter tank, driving the filter material in the filter tank to expand and rub against each other, thereby cleaning the impurities on the surface of the filter material; during this period, the filter material with impurities on the surface cleaned off is blocked by the filter material baffle and returns to the filter tank again through the gap between the filter material baffle and the air-water baffle 120, avoiding the filter material from entering the channel 110 and causing the filter material to be lost, while the backwashing wastewater passes through the filter material baffle and the air-water baffle 120. 0 flows slowly and enters the channel 110 through the through hole 117, and is finally discharged from the filter tank through the liquid outlet 116. After the backwashing is completed, the air-water backwashing device is closed, and the liquid inlet 115 is adjusted to an open state. At this time, the liquid outlet 116 is kept open, and the cleaning liquid introduced through the liquid inlet 115 (the waste water to be treated can also be continued to be used) enters the tank body 111 of the channel 110 to clean the mud remaining at the bottom of the channel 110 during the backwashing process, and is discharged from the filter tank through the liquid outlet 116.

[0059] Among them, the air-water backwashing device mentioned in the above scheme for injecting backwashing air and water into the filter tank can adopt existing technology devices, such as backwashing fans and backwashing water pumps. At the same time, it is not the innovation point of the present invention, so no additional description is given.

[0060] According to the interception device 100 of the present invention, the filter tank water inlet and backwash drainage can share the same channel 110 (tank body 111), and can also effectively prevent the loss of filter material during the backwashing process of the filter tank and clean the mud at the bottom of the channel 110.

[0061] In order to provide a filter material baffle with a simple structure but good use effect, the filter material baffle may include an outer baffle 131 and an inner baffle 132 which are vertically parallel to each other and spaced apart.

[0062] Specifically, the outer baffle 131 is connected to the side plate 112 of the tank body 111 via the connection plates 133 arranged at intervals in the front-to-back direction. The outer baffle 131 is arranged above the air-water baffle 120. A gap 134 is left between the bottom end of the outer baffle 131 and the air-water baffle 120 to allow the filter material to pass through. The horizontal projection length of the air-water baffle 120 is greater than the horizontal distance between the outer baffle 131 and the side plate 112 of the channel 110.

[0063] The inner baffle plate 132 is located inside the outer baffle plate 131. The height of the inner baffle plate 132 can be higher than that of the outer baffle plate 131. The inner baffle plate 132 further blocks the filter material overflowing from the upper part of the outer baffle plate 131. A gap 134 is also required between the bottom end of the inner baffle plate 132 and the air-water baffle plate 120. The gap 134 should be larger than the particle size of the filter material to ensure that the filter material can slide down smoothly, so that the filter material is blocked and settles to the area between the air-water baffle plate 120 and the outer baffle plate 131.

[0064] The inner baffle plate 132 can be vertically connected to the connecting plate 133. There is no restriction on the specific connection method between the inner baffle plate 132 and the connecting plate 133, but at least a gap 134 must be ensured between the inner baffle plate 132 and the air-water baffle plate 120, so that the filter material can climb over or fall back into the filter tank through the gap 134. For example, the inner baffle plate 132 can be set in a groove set at the top of the connecting plate 133, so that there will be a larger gap 134 between the inner baffle plate 132 and the air-water baffle plate 120, which is enough for the filter material to pass through.

[0065] Continuing from the above, in this case, the air-water baffle 120 and the outer baffle 131 can effectively block most of the filter material driven by the backwashing air and water from the bottom of the filter tank from directly entering the channel 110 during the backwashing process. In the backwashing process, it is inevitable that some of the filter material will climb over the outer baffle 131 and enter in front of the inner baffle 132. At this time, due to the blocking of the backwashing air and backwashing water by the air-water baffle 120, a relatively static area is formed between the outer baffle 131 and the inner baffle 132. Since the inner baffle 132 is higher than the outer baffle 131, and the density of the filter material is greater than the density of water, the filter material that climbs over the outer baffle 131 will be blocked by the inner baffle 132, so that it can naturally settle down and return to the filter tank again through the gap between the outer baffle 131 and the air-water baffle 120, avoiding the filter material from entering the channel 110 and causing the filter material to be lost. The backwash wastewater without filter media can directly flow slowly through another calmer area formed between the inner baffle 132 and the air-water baffle 120 and enter the channel 110 through the through hole 117, and finally be discharged from the filter tank through the liquid outlet 116.

[0066] It can be understood that the filter material baffle including both the outer baffle 131 and the inner baffle 132 is the best embodiment. Logically speaking, the filter material baffle may only include the outer baffle 131 or the inner baffle 132, and the effect will be weakened accordingly.

[0067] Furthermore, the channel 110 may be a relatively closed structure. That is, the channel 110 may also include end plates 114 located at both ends in the front-rear direction and a top plate located at the top. The bottom plate 113, the side plates 112, the end plates 114 and the top plate form a relatively closed structure. The liquid inlet 115 and the liquid outlet 116 are respectively arranged on the end plates 114.

[0068] When the channel 110 does not include the end plate 114 , the openings at both ends of the tank body 111 along the front-to-back direction correspond to the liquid inlet 115 and the liquid outlet 116 , respectively.

[0069] It can be understood that it is a preferred embodiment that the channel 110 is provided with both the end plate 114 and the top plate, and it is also possible to provide only the end plate 114 or the top plate.

[0070] The top of the side panels 112 may be bent inwards to improve stability. In addition, the tops of the side panels 112 on both sides may be connected by spaced reinforcing plates 118 to further reinforce them.

[0071] In addition, the air-water baffle 120 can also be strengthened and fixed by providing reinforcing ribs 121 and support plates 122 .

[0072] refer to Figure 2 In a preferred embodiment, the bottom plate 113 of the tank body 111 may be a V-shaped bottom plate 113 with a lower middle and higher ends. The air-water baffle 120 is connected to the connection between the side plate 112 and the bottom plate 113 of the tank body 111. In this way, a "from"-shaped structure is formed between the channel 110 (tank body 111) and the air-water baffles 120 on both sides, and an obtuse angle A is formed between the air-water baffle 120 and the bottom plate 113.

[0073] As can be seen from the above, the microorganisms on the carrier filter material carry out biochemical reactions on the wastewater, and the denitrifying microorganisms use the nitrate in the wastewater as an electron acceptor to produce a certain amount of nitrogen, as well as the backwash gas rising in the filter tank during the backwash process. Most of the generated gas is discharged above the water surface and directly enters the atmosphere, and the remaining small part slowly rises to the angle A where the air-water baffle 120 is connected to the bottom plate 113 of the channel 110. In order to solve the problem of the safe release of this part of the gas and ensure the smooth operation of the filter tank, the interception device 100 can also include an exhaust pipe 140. The exhaust pipe 140 is connected to the connection between the air-water baffle 120 and the bottom plate 113. Among them, the angle A formed between the air-water baffle 120 and the bottom plate 113 is an obtuse angle. The obtuse angle A is conducive to the gathering of gas (nitrogen), and the gathered nitrogen is discharged into the atmosphere through the exhaust pipe 140. Preferably, the angle may be 100 degrees to 150 degrees, such as 100 degrees, 120 degrees, 150 degrees or other suitable angles.

[0074] In order to realize the installation of the interception device 100 in the filter tank, a mounting plate 150 for connecting the interception device 100 to the filter tank wall 210 may also be included. For example, the mounting plate 150 can be connected to the filter tank wall 210 via bolts by setting bolt holes 151, and can be applicable to various structural forms such as concrete walls, steel tanks and steel tanks. The mounting plate 150 is attached to both ends of the tank body 111 along the front-to-back direction. For example, when the lengths of the tank body 111, the air-water baffle 120, the outer baffle 131 and the inner baffle 132 along the front-to-back direction are consistent, the mounting plate 150 is attached to the tank body 111, the air-water baffle 120, the outer baffle 131 and the inner baffle 132 at the same end. The mounting plate 150 has corresponding perforations for the water inlet pipe 220 and the water outlet pipe 230 to be connected to the liquid inlet 115 and the liquid outlet 116 respectively.

[0075] In summary, according to the interception device 100 of the present invention, the filter tank water inlet and backwash drainage share the same channel 110, which can not only solve the problems of uneven water distribution and caking at the bottom of a single backwash channel during the filter tank water inlet process, but also effectively prevent the loss of filter media during the filter tank backwashing process and the problem of manual and uninterrupted replenishment of filter media; the interception device 100 is easy to construct and install, and does not require manual intervention and maintenance. It not only reduces the workload of personnel and the cost of operation and management, but also improves the stability of the filter tank process operation.

[0076] In a second aspect, the present invention further provides a method for intercepting filter material for wastewater treatment, based on the interception device 100 of the above embodiment. The interception method may include the following steps:

[0077] The liquid outlet 116 is set to a closed state, and the waste water to be treated is introduced into the tank body 111 of the channel 110 through the liquid inlet 115, and then flows downward into the filter tank through the through hole 117.

[0078] After the waste water and the microorganisms attached to the filter media in the filter tank undergo biochemical reactions in the filter tank for a period of time, impurities in the waste water are continuously intercepted between the filter media, and part of the gas generated during this period gathers at the connection between the air-water baffle 120 and the bottom plate 113 and is discharged into the atmosphere through the exhaust pipe 140.

[0079] The liquid inlet 115 is adjusted to a closed state, the introduction of waste water is stopped, the liquid outlet 116 is opened, and the air-water backwashing device connected to the bottom of the filter tank is turned on. The backwashing air and water flow upward from the bottom of the filter tank, driving the filter media in the filter tank to expand and rub against each other, thereby cleaning away impurities on the surface of the filter media.

[0080] In the process of backwashing gas and water flowing upward from the bottom of the filter tank, the gas-water baffle 120 and the outer baffle 131 first block most of the filter material driven by the backwashing gas and water from entering the channel 110. The remaining filter material after crossing the outer baffle 131 will be blocked by the inner baffle 132, and thus naturally settle down and return to the filter tank again through the gap between the outer baffle 131 and the gas-water baffle 120, thereby preventing the filter material from entering the channel 110 and causing the filter material to be lost.

[0081] The backwash wastewater without mixed filter media flows slowly through the gap area formed between the inner baffle 132 and the air-water baffle 120 and enters the channel 110 through the through hole 117, and is finally discharged from the filter tank through the liquid outlet 116. Part of the gas generated during backwashing gathers at the connection between the air-water baffle 120 and the bottom plate 113 and is also discharged into the atmosphere through the exhaust pipe 140.

[0082] After the backwashing is finished, the air-water backwashing device is closed, and the liquid inlet 115 is adjusted to the open state again. At this time, the liquid outlet 116 is kept open, and the cleaning liquid (which can be a separate cleaning liquid or waste water to be treated) introduced through the liquid inlet 115 enters the tank body 111 of the channel 110 to clean the mud remaining at the bottom of the channel 110 during the backwashing process, and is discharged from the filter tank through the liquid outlet 116. This can effectively solve the problem that the backwash channel and the water inlet channel of some traditional filters are not shared, and the backwash channel 110 is prone to form agglomeration of bottom sediment.

[0083] After the mud at the bottom of the channel 110 is flushed, the liquid outlet 116 is closed.

[0084] refer to Figure 4 , wherein the liquid inlet 115 can be connected to the lift pump through the water inlet pipe 220. A valve is provided on the water inlet pipe 220. The liquid outlet 116 can be connected to the water outlet pipe 230. A corresponding valve is also provided on the water outlet pipe 230.

[0085] The opening and closing of the liquid inlet 115 or the liquid outlet 116 can be achieved by adjusting the opening and closing of the valve on the water inlet pipe 220 or the water outlet pipe 230, respectively.

[0086] After the mud at the bottom of the channel 110 is flushed and the valve on the outlet pipe 230 is closed, the normal water inlet state is restored and the wastewater treatment is continued.

[0087] Since the interception method provided according to the present invention includes all the features and effects of the interception device of the above-mentioned embodiment, they will not be described again here.

[0088] Other embodiments of the present invention will be readily apparent to those skilled in the art from the description and practice of the invention disclosed herein. The description and embodiments are to be considered exemplary only, and the true scope and spirit of the present invention are to be limited by the claims.

Claims

1. A filter material interception device for waste water treatment, characterized in that: The interception device is used to be arranged in a filter tank containing filter material, and the interception device comprises: A channel extending in the front-to-back direction, the channel at least comprising a U-shaped trough body surrounded by a side plate and a bottom plate for liquid to flow in the front-to-back direction: Wherein, the two ends of the tank body along the front-to-back direction respectively have a liquid inlet and a liquid outlet for liquid in and out, and the upper part of the side plate of the tank body is provided with through holes for liquid to pass through at intervals along the front-to-back direction; Air-water baffles located on both sides and connected to the tank body and extending in the front-to-back direction, the air-water baffles extending outward in the left-right direction and tilting downward; and A filter material baffle is connected to the trough body and extends in the front-to-back direction. The filter material baffle is constructed to be arranged vertically at a certain distance from the trough body. The filter material baffle is located above the air-water baffle on the corresponding side and inside the horizontal projection of the air-water baffle, and a gap is left between the bottom end of the filter material baffle and the air-water baffle.

2. The interception device according to claim 1, characterized in that: The filter material baffle comprises a vertical outer baffle, and the outer baffle is connected to the side plate of the tank body via connecting plates arranged at intervals in the front-to-back direction.

3. The interception device according to claim 2, characterized in that: The filter material baffle further comprises a vertical inner baffle located on the inner side of the outer baffle, the inner baffle being connected to the connecting plate; Wherein, the height of the inner baffle is higher than that of the outer baffle.

4. The interception device according to claim 1, characterized in that: The channel further comprises end plates at both ends in the front-rear direction and / or a top plate at the top; Wherein, the liquid inlet and the liquid outlet are respectively arranged on the end plate.

5. The interception device according to claim 1, characterized in that: The through holes are arranged at equal intervals to the upper part of the side plate of the tank body; and / or The lengths of the trough body, the air-water baffle and the filter material baffle along the front-to-back direction are consistent.

6. The interception device according to claim 1, characterized in that: The bottom plate of the tank body is a V-shaped bottom plate with a low middle and high ends, and the air-water baffle is connected to the connection between the side plate and the bottom plate of the tank body; Wherein, the angle between the air-water baffle and the bottom plate is 100 degrees to 150 degrees.

7. The interception device according to claim 7, characterized in that: The intercepting device also includes an exhaust pipe, which is connected to the connection between the air-water baffle and the bottom plate.

8. The interception device according to claim 1, characterized in that: It also includes a mounting plate for connecting the intercepting device to the filter tank wall, and the mounting plate is at least attached to the two ends of the tank body along the front-to-back direction.

9. The interception device according to claim 1, characterized in that: The interception device is arranged at the top of the filter tank; The bottom of the filter tank is connected to an air-water backwashing device for injecting backwashing air and water into the filter tank.

10. A method for intercepting filter material for wastewater treatment, based on the interception device according to any one of claims 1 to 9, characterized in that: The interception method comprises: The liquid outlet is set to a closed state, and the waste water to be treated is introduced into the tank body of the channel through the liquid inlet, and then flows downward into the filter tank through the through hole; After the wastewater and the microorganisms attached to the filter media in the filter tank have a biochemical reaction in the filter tank for a period of time, the impurities in the wastewater are continuously intercepted between the filter media, and part of the gas generated during this period is gathered at the connection between the air-water baffle and the bottom plate and discharged into the atmosphere through the exhaust pipe; The liquid inlet is adjusted to a closed state, the introduction of waste water is stopped, the liquid outlet is opened, and the air-water backwashing device connected to the bottom of the filter tank is turned on. The backwashing air and water flow upward from the bottom of the filter tank, driving the filter media in the filter tank to expand and rub against each other, thereby cleaning away impurities on the surface of the filter media; When the backwashing gas and water flow upward from the bottom of the filter tank, the gas-water baffle and the outer baffle first block most of the filter material driven by the backwashing gas and water from entering the channel. The remaining filter material after crossing the outer baffle will be blocked by the inner baffle, and then naturally settle down and return to the filter tank through the gap between the outer baffle and the gas-water baffle, thus preventing the filter material from entering the channel and causing the filter material to be lost. The backwash wastewater without filter media flows slowly through the gap area formed between the inner baffle and the air-water baffle and enters the channel through the through hole, and finally is discharged from the filter tank through the liquid outlet. Part of the gas generated during the backwashing process gathers at the connection between the air-water baffle and the bottom plate and is also discharged into the atmosphere through the exhaust pipe. After the backwashing is completed, the air-water backwashing device is closed, and the liquid inlet is adjusted to the open state. At this time, the liquid outlet is kept open, and the cleaning liquid introduced through the liquid inlet enters the tank body of the channel to clean the mud remaining at the bottom of the channel during the backwashing process, and is discharged from the filter tank through the liquid outlet; After the mud at the bottom of the channel is flushed, close the liquid outlet.

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