A high efficiency shallow horizontal flow filtration module of the blade type

Abstract

A kind of blade type high-efficiency shallow horizontal flow filtration module, the filter tank body of filtration module includes sheet type filter material, vertical water distribution channel, vertical water collection channel, horizontal water distribution channel and horizontal water collection channel, in the filter tank body, sheet type filter material length both ends are equipped with vertical water distribution channel and water collection channel, width both sides are equipped with horizontal water distribution channel and horizontal water collection channel, horizontal water distribution channel has multiple independent water inlet channels arranged along the height of filter material, horizontal water collection channel has corresponding water outlet channel, the water inlet end of water inlet channel is communicated with vertical water distribution channel, the water outlet end of water outlet channel is communicated with vertical water collection channel, water inlet channel and water outlet channel are communicated by sheet type filter material.The device vertically arranges sheet type filter material, and the pollution carrying capacity of filter material is more fully exerted by cooperation of various components, shallow and efficient filtration of water is realized, and the pollution carrying capacity of filter material is fully exerted, the water treatment efficiency is improved, while the occupied area is greatly reduced, the construction difficulty and cost are reduced, and standardization production and construction are beneficial.

Description

Technical Field

[0001] The invention relates to the field of water treatment and filtration, in particular to a blade-shaped high-efficiency shallow horizontal flow filtration module. Background Art

[0002] Filtration is a key process in water treatment, widely used both domestically and internationally, and is one of the universal supporting technologies for water treatment. Media filtration is the filtration technology with the longest history, richest experience, and widest application. Common media filtration filters include valveless filters, siphon filters, double-valve filters, V-type filters, D-type filters, and flap filters. V-type sand filters with air-water backwashing are the most widely used, offering advantages such as excellent filtration and backwashing performance.

[0003] Air-water backwash V-sand filters feature "deep filtration." As water flows from top to bottom, suspended particles (impurities) in the water adhere to the filter media particles through adhesion and / or adsorption bridging. As filtration progresses, more and more particles adhere to the upper filter media, reducing the porosity of the filter layer. This leads to increasing shear forces from the water flow, ultimately causing the adhered particles to fall off first, or for subsequent particles carried by the water flow to no longer adhere. As a result, suspended particles migrate to the middle and lower layers, where the filter media's ability to retain suspended particles gradually becomes fully utilized. However, filtration often ceases before the lower filter media has fully utilized its ability to retain suspended particles. This is because the upper filter media intercepts a large number of suspended particles, causing a sharp increase in head loss, making continued filtration uneconomical.

[0004] With the continuous enrichment of water treatment scenarios, such as deep treatment of sewage plants, treatment of CSO, treatment of initial rain, microfiltration or ultrafiltration front-end pretreatment, etc., the requirements for the effluent are not so high. The existing V-type filter does not have an advantage in cost performance. As a result, surface filtration technologies such as filter cloth filter (fiber cloth) and precision filter (woven metal mesh) have emerged. However, there are also problems such as difficult penetration detection and low safety guarantee rate. Therefore, it is of great practical significance to study how to utilize the advantages of filter material filtration and make it more economical.

[0005] In response to the above problems and actual needs, "shallow filtration" is an effective method to solve the above problems. It still uses the "vertical flow" model, with water flowing from top to bottom. Compared with the "deep filtration" V-type filter, only the thickness of the filter layer is changed. The structure is mature, the pool depth is shallower, and the treatment capacity remains unchanged with the same floor space, but the cost is reduced to a certain extent. It is a solution to the above problems (such as the "Hydro-Clear shallow sand filtration process" of Gome (Tianjin) Water Technology Engineering Co., Ltd.). However, this vertical flow "shallow filtration" model still needs further improvement, and its main disadvantages are as follows:

[0006] (1) It occupies a large area, which is consistent with the existing V-type filter tank of the same size.

[0007] (2) The structure is complex. Except for the different pool depth, the rest of the structure is generally consistent with the V-type filter.

[0008] (3) The cost is relatively high. Although the filter layer is thinner and the pool depth is shallower, the overall cost savings compared to the existing V-type filter are limited.

[0009] (4) Similar to the V-type filter tank, it mostly uses concrete structure, which is difficult to construct, has a long construction period, high requirements, and is difficult to advance modularly. Summary of the Invention

[0010] The present invention solves the deficiencies of the prior art and provides a blade-shaped high-efficiency shallow horizontal flow filtration module with a simple structure, significantly improved filtration efficiency per unit area, modular fabrication, simple construction, and ease of installation, disassembly and replacement.

[0011] The technical solution adopted by the present invention to solve its technical problems is: a blade-shaped high-efficiency shallow horizontal flow filtration module, including a filter body, the filter body including a thin-sheet filter material, a vertical water distribution channel connected to the water inlet, a vertical water collection channel connected to the water outlet, and a horizontal water distribution channel and a horizontal water collection channel; the vertical water distribution channel and the vertical water collection channel are respectively arranged on the two end sides of the thin-sheet filter material in the length direction, the horizontal water distribution channel and the horizontal water collection channel are respectively arranged on both sides of the width direction of the thin-sheet filter material, the horizontal water distribution channel includes a plurality of mutually independent water inlet channels arranged along the height direction of the thin-sheet filter material, the horizontal water collection channel includes a plurality of mutually independent water outlet channels arranged along the height direction of the thin-sheet filter material, the water inlet channels and the water outlet channels on both sides of the thin-sheet filter material are arranged correspondingly, the water inlet end of the water inlet channel is connected to the vertical water distribution channel, the water outlet end of the water outlet channel is connected to the vertical water collection channel, and the water outlet end of the water inlet channel is connected to the water inlet end of the water outlet channel through the thin-sheet filter material.

[0012] In this embodiment, the elevation of the water inlet of the vertical water distribution channel is not higher than the elevation of the water inlet channel at the bottom, and a first overflow weir is provided at the top of the vertical water collection channel. The elevation of the first overflow weir is not lower than the elevation of the water outlet channel at the top. The vertical water collection channel is connected to the drop well through the overflow weir, and an outlet pipe is installed on the water outlet of the drop well.

[0013] In this embodiment, the transverse water distribution channel and the transverse water collection channel have the same structure and both include an outer baffle, a partition and a first grid. The outer baffle and the first grid are parallel to each other and arranged vertically, the partition is arranged in the horizontal direction, and multiple partitions are arranged and fixed between the outer baffle and the first grid in the height direction, forming independent water flow channels between adjacent partitions; a gap is provided between the first grid of the transverse water distribution channel and the first grid of the transverse water collection channel to form a filtration area for placing thin-sheet filter materials.

[0014] In this embodiment, the sheet-type filter material includes a filter brick layer, a supporting layer and a filter layer arranged in sequence from bottom to top.

[0015] In this embodiment, the multiple water inlet channels of the transverse water distribution channel and the multiple water outlet channels of the transverse water collection channel cover both sides of the filter layer of the thin-sheet filter material, and the height of the top and bottom sides of the filter layer of the thin-sheet filter material not covered by the transverse water distribution channel and the transverse water collection channel does not exceed the thickness of the thin-sheet filter material.

[0016] In this embodiment, the thickness of the sheet-type filter material is 100 to 500 mm, and preferably the thickness of the sheet-type filter material is 250 mm.

[0017] In this embodiment, an air backwash system and a water backwash system are installed on the filter body.

[0018] In this embodiment, the water backwash system includes a backwash water inlet and a backwash drainage channel, the top of the filter area is open and the bottom is sealed; the top of the filter body is provided with an opening connected to the top opening of the filter area, and a removable second grid is also installed in the filter body, above the top of the filter area, and a gap is provided between the second grid and the top of the thin-film filter material to form a backwash expansion chamber, a backwash drainage channel is provided in the filter body, a second overflow weir is provided on the top of the filter area, and the filter area is connected to the inlet of the backwash drainage channel through the second overflow weir, and the outlet of the backwash drainage channel is provided on the side of the filter body close to the vertical water distribution channel, and the bottom of the filter area is provided with a backwash water inlet close to the vertical water collection channel; the air backwash system includes a backwash gas inlet; the bottom of the filter area is provided with a backwash gas inlet close to the vertical water distribution channel.

[0019] In this embodiment, the filter body is a gravity filter.

[0020] In this embodiment, the filter body is a pressure-type filter, and a primary filtered water outlet is provided near the bottom of the vertical water collection channel. The air backwash system also includes a third exhaust device, which is also provided at the top of the filter body and is connected to the backwash drainage channel.

[0021] Due to the adoption of the above scheme, the device has the following advantages:

[0022] 1. The present invention adopts a vertical design, arranging the flaky filter media vertically within the filter tank body. Compared to traditional filtration methods, this device achieves "horizontal flow" and "shallow filtration" modes. Within the filter tank body, vertical distribution channels and vertical collection channels are respectively provided at both ends of the flaky filter media in the longitudinal direction, and transverse distribution channels and transverse collection channels are respectively provided on both sides in the width direction. Multiple independent water inlet channels of the transverse distribution channels and multiple independent water outlet channels of the transverse collection channels are arranged along the height of the flaky filter media, and the water inlet and outlet channels are arranged in a corresponding manner and connected through the flaky filter media. This unique layout greatly saves space, reduces the equipment footprint, and effectively improves filtration efficiency, allowing more water to be processed in a shorter time.

[0023] 2. This invention utilizes a carefully designed waterway, with water entering from the bottom through the inlet pipe into the vertical distribution channel. Water is then evenly distributed to the flaky filter media through multiple inlet channels in the horizontal distribution channel. After filtration, the water is collected through multiple outlet channels in the horizontal collection channel into the vertical collection channel, and finally discharged from the top. This "uniform waterway" arrangement ensures uniform flow velocity and flow across the entire filter surface, achieving uniform filtration across the entire filter surface. This improves the consistency of the filtration effect and avoids the problem of over- or under-filtration in certain areas.

[0024] 3. The present invention is equivalent to cutting the original filter material into thin-sheet filter material in the vertical direction, so that the thin-sheet filter material can be arranged arbitrarily in multiple pieces, which greatly reduces the floor space. Through the cooperation of the horizontal water distribution channel, the horizontal water collection channel and the thin-sheet filter material, the pollution holding capacity of the filter material can be more fully exerted, and the shallow and efficient filtration of water can be achieved and the pollution holding capacity of the filter material can be fully exerted, thereby improving the water treatment efficiency. Moreover, the blade-shaped high-efficiency shallow horizontal flow filtration module adopts a modular design, which can be standardized for production and convenient for factory processing. Moreover, the utilization rate of the thin-sheet filter material is improved, so that the pollution holding capacity of the filter layer can be evenly exerted, thereby significantly improving the water production, reducing the backwash gas, water volume and energy consumption, improving the backwash drainage concentration, reducing the head loss, and operating more energy-saving and low-carbon.

[0025] 4. The present invention utilizes first and second screens to effectively intercept filter media, preventing it from being lost with the water flow during backwashing, thus avoiding filter media loss. Furthermore, the screens limit the free expansion of the filter media during backwashing, increasing the friction between the filter media and the expansion. This friction more effectively removes impurities trapped on the filter media surface, thereby improving backwash efficiency, enabling the filter media to recover its filtration performance more quickly, extending its service life, and reducing the cost of frequent filter media replacement.

[0026] 5. The filter tank body of the present invention is equipped with an air backwash system and a water backwash system. Through the rotation and joint operation of the air backwash system and the water backwash system, combined with the thin thickness of the thin-sheet filter material itself, the backwash effect of the thin-sheet filter material can be improved, and the efficiency of recovering the pollution holding capacity of the filter material can be further improved.

[0027] To sum up, the present application arranges the sheet-type filter material in a vertical manner in the filter tank body. Through the coordination of the horizontal water distribution channel, the horizontal water collection channel and the sheet-type filter material, the pollution holding capacity of the filter material is more fully utilized, and the shallow and efficient filtration of water is achieved and the pollution holding capacity of the filter material is fully utilized, thereby improving the water treatment efficiency. At the same time, it can also greatly reduce the floor area, thereby reducing the construction difficulty and construction cost, and facilitating standardized production and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a top view of the top surface of Example 1 of the present invention.

[0029] Figure 2 For the present invention Figure 1 Cross-section at AA.

[0030] Figure 3 For the present invention Figure 1 Cross-section at BB.

[0031] Figure 4 For the present invention Figure 1 Cross-sectional view at CC.

[0032] Figure 5 For the present invention Figure 1 Cross-section at DD.

[0033] Figure 6 For the present invention Figure 1 Cross-section at EE.

[0034] Figure 7 For the present invention Figure 1 Cross-sectional view at FF.

[0035] Figure 8 For the present invention Figure 5 The cross-section is taken at the elevation of 2.9m marked in the figure.

[0036] Figure 9 For the present invention Figure 5 Sectional view at the 2.5m elevation marked in the figure.

[0037] Figure 10 For the present invention Figure 5 The cross-section at the elevation of 0.5m marked in the figure.

[0038] Figure 11This is a cross-sectional view of Example 2 of the present invention.

[0039] In the accompanying drawings, 1. filter tank body; 11. vertical water distribution channel; 111. water inlet pipe; 112. first exhaust device; 12. vertical water collecting channel; 121. water outlet pipe; 122. first overflow weir; 123. second exhaust device; 124. primary filtration water drainage pipe; 13. horizontal water distribution channel; 131. outer baffle; 132. first screen; 133. partition; 134. water flow channel; 14. horizontal water collecting channel; 15. backwash drainage channel; 151. backwash water inlet pipe; 152. backwash drainage pipe; 153. third exhaust device; 154. backwash expansion chamber; 16. drop well; 17. backwash air inlet pipe; 18. fixed base; 19. inspection cover; 2. sheet-type filter material; 21. filter layer; 22. supporting layer; 23. filter brick layer; 24. second screen. DETAILED DESCRIPTION

[0040] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. Example 1

[0041] like Figures 1 to 10As shown, a blade-shaped high-efficiency shallow horizontal flow filtration module includes a filter body 1. The filter body 1 in this embodiment is a gravity filter. The bottom of the filter body 1 is fixed to the ground by a fixed base 18. The filter body 1 includes a thin-sheet filter material 2, a vertical water distribution channel 11 connected to the water inlet, a vertical water collection channel 12 connected to the water outlet, a horizontal water distribution channel 13 and a horizontal water collection channel 14; the thin-sheet filter material 2 is arranged vertically, and the vertical water distribution channel 11 and the vertical water collection channel 12 are respectively provided in the filter body 1 at both ends of the length direction of the thin-sheet filter material 2. A horizontal water distribution channel 13 and a horizontal water collection channel 14 are separately provided. The horizontal water distribution channel 13 includes a plurality of independent water flow channels 134 arranged along the height direction of the flaky filter material 2 to form a plurality of water inlet channels. The horizontal water collection channel 14 includes a plurality of independent water flow channels 134 arranged along the height direction of the flaky filter material 2 to form a plurality of water outlet channels. The water inlet channels and water outlet channels on both sides of the flaky filter material 2 are arranged correspondingly. The water inlet end of the water inlet channel is connected to the vertical water distribution channel 11, and the water outlet end of the water outlet channel is connected to the vertical water collection channel 12. The water outlet end of the water inlet channel is connected to the water inlet end of the water outlet channel through the flaky filter material 2;

[0042] like Figure 5 、 Figure 6 、 Figure 7 As shown, the filter tank body 1 is provided with an inlet pipe 111 and an outlet pipe 121. The inlet pipe 111 is arranged on the water inlet of the vertical water distribution channel 11. The elevation of the water inlet of the vertical water distribution channel is not higher than the elevation of the water inlet channel at the bottom. A first overflow weir 122 is provided on the top outlet of the vertical water collection channel 12. The elevation of the outlet of the first overflow weir 122 is not lower than the elevation of the water outlet channel at the top. The vertical water collection channel 12 is connected to the drop well 16 through the overflow weir. The outlet of the drop well 16 is installed with an outlet pipe 121. Furthermore, valves are installed on both the inlet pipe 111 and the outlet pipe 121.

[0043] like Figure 3 As shown, the horizontal water distribution channel 13 and the horizontal water collection channel 14 have the same structure and both include an outer baffle 131, a partition 133 and a first grid 132. The outer baffle 131 and the first grid 132 are parallel to each other and arranged vertically. The partition 133 is arranged in the horizontal direction. Multiple partitions 133 are arranged in the height direction and fixed between the outer baffle 131 and the first grid 132. Independent water flow channels 134 are formed between adjacent partitions 133; a gap is provided between the first grid 132 of the horizontal water distribution channel 13 and the first grid 132 of the horizontal water collection channel 14 to form a filtration area for placing the thin-sheet filter material 2; the height of the vertical water distribution channel 11 and the vertical water collection channel 12 is not lower than the height of the thin-sheet filter material 2, so that the vertical water distribution channel 11 and the vertical water collection channel 12 cover all the water flow channels 134 in the height direction.

[0044] The thin-sheet filter material 2 includes a filter brick layer 23, a supporting layer 22 and a filter layer 21 arranged in sequence from bottom to top. The filter brick layer 23 uses finished filter bricks, the supporting layer 22 uses gravel, and the filter layer 21 uses quartz sand or expanded clay. The multiple water inlet channels of the horizontal water distribution channel 13 and the multiple water outlet channels of the horizontal water collection channel 14 cover the two sides of the filter layer 21 of the thin-sheet filter material 2. The height of the top and bottom sides of the filter layer of the thin-sheet filter material not covered by the horizontal water distribution channel and the horizontal water collection channel does not exceed the thickness of the thin-sheet filter material, thereby improving the utilization rate of the thin-sheet filter material while ensuring the filtration efficiency.

[0045] like Figure 6 、 Figure 7 As shown, the filter body 1 is equipped with an air backwash system and a water backwash system. The top of the filter body 1 is provided with a first exhaust device 112 and a second exhaust device 123. The first exhaust device 112 is connected to the vertical water distribution channel 11, and the top of the filter body 1 is provided with a second exhaust device 123 which is connected to one side of the water outlet of the vertical water collection channel 12.

[0046] like Figure 6 、 Figure 8 As shown, the water backwash system includes a backwash water pump, a valve, a flow meter, a pressure gauge and a backwash water inlet pipe 151, a backwash drain pipe 152 and a backwash drain channel 15. The top of the filter area is open and the bottom is sealed; the top of the filter body 1 is provided with an opening that is connected to the top opening of the filter area, and a maintenance cover 19 is detachably installed in the top opening of the filter body 1. A detachable second grid 24 is also installed in the filter body 1, below the maintenance cover 19 and above the top of the filter area. A gap is provided between the second grid 24 and the top of the thin-sheet filter material 2 to form a backwash expansion chamber 154. A backwash drain is provided in the filter body 1 and above the horizontal water collection channel 14. The water channel 15, the top opening of the filtration area forms a second overflow weir connected to the inlet of the backwash drainage channel 15, the length of the backwash drainage channel 15 matches the length of the flaky filter material 2, the outlet of the backwash drainage channel 15 is arranged on the side of the filter body 1 close to the vertical water distribution channel 11, and the backwash drainage pipe 152 is installed on the water outlet of the backwash drainage pipe 152. A backwash water inlet is provided on the bottom of the filtration area close to the vertical water collection channel 12, and a backwash water inlet pipe 151 is installed on the backwash water inlet. The backwash water inlet pipe 151 is connected to the backwash water pump through a pipeline, and is installed with a valve, a flow meter and a pressure gauge. A valve is also installed on the backwash drainage pipe 152;

[0047] The air backwash system includes a backwash fan, a valve, a flow meter, a pressure gauge and a backwash air inlet pipe 17; a backwash air inlet is provided at the bottom of the filter area near the vertical water distribution channel 11, and a backwash air inlet pipe 17 is installed on the backwash air inlet. The backwash air inlet pipe 17 is connected to the backwash fan through a pipeline, and a valve, a flow meter and a pressure gauge are installed on the pipeline;

[0048] Furthermore, when this embodiment operates as a gravity mode, the first exhaust device 112 includes a ball valve and an exhaust valve connected in series, and the second exhaust device 123 includes a ball valve;

[0049] In this embodiment, the contact area of ​​the thin-sheet filter material 2 on both sides in the width direction is large, thereby achieving shallow filtration while ensuring treatment efficiency, and the cost-effectiveness will be significantly improved. In this embodiment, the thickness of the thin-sheet filter material can be flexibly set to 100 to 500 mm according to the needs of water treatment and usage. The thickness of the thin-sheet filter material is preferably 250 mm.

[0050] The specific usage of this embodiment is as follows:

[0051] The water to be treated enters the vertical water distribution channel 11 through the water inlet pipe 111, flows into the horizontal water distribution channel 13 through the vertical water distribution channel 11, and enters the water inlet channel of the horizontal water distribution channel 13, and then passes through the first grid 132 and flows to the flaky filter material 2. The water filtered by the flaky filter material 2 flows into the outlet channel of the horizontal water collection channel 14, and then flows into the vertical water collection channel 12. It overflows through the first weir and finally flows out of the outlet pipe, completing the entire "horizontal flow" filtration process. In this process, since the horizontal water distribution channel 13 and the horizontal water collection channel 14 are both composed of multiple water flow channels 134 arranged along the height direction of the flaky filter material 2, as the water level of the vertical water distribution channel 11 rises, water will flow into each water flow channel 134. Using the principle that water flows toward the point with the lowest pressure, the water to be treated will flow from the flaky filter material 2 to the outlet channel. The side water flow channel 134 flows along the shortest distance to the corresponding water flow channel 134 on the other side, ensuring that each layer of water flow channel 134 is filtered at the same time; and because the distance that water flows through each water flow channel 134 is the same, the consistency of the filtering effect of each water flow channel 134 is guaranteed; using this device is equivalent to cutting the original filter material into thin-sheet filter material 2 in the vertical direction, so that the thin-sheet filter material 2 can be arranged in parallel in multiple pieces. Through the cooperation of the horizontal water distribution channel 13, the horizontal water collection channel 14 and the thin-sheet filter material 2, the coverage rate of the water to be treated on the thin-sheet filter material 2 is guaranteed, the utilization rate of the thin-sheet filter material 2 is improved, and the installation is more flexible, which can reduce the layout area. Moreover, the device has a simple structure, low cost, modular production, simple construction, and is easy to install, disassemble and replace.

[0052] The device also includes an air backwash system and a water backwash system. During filtration, both the first exhaust device 112 and the second exhaust device 123 are open. As filtration time continues, the filtration resistance will continue to increase. When the water level in the vertical water distribution channel 11 rises to the maximum level, the backwash phase begins. The backwashing process uses a combined air and water backwashing technology, which is divided into three stages: air backwashing, combined air and water backwashing, and water backwashing. The first stage is a separate air backwash. First, close the valve on the water inlet pipe. After the liquid level in the vertical water distribution channel drops to the second overflow weir elevation, close the valve of the water outlet pipe, then close the first exhaust device 112 and the second exhaust device 123, and open the air backwash system for air washing; the second stage is a combined air-water backwash. When the air backwash reaches the set time, open the water backwash system and perform a combined air-water backwash at the same time; the third stage is a water backwash stage. When the combined air-water backwash reaches the set time, close the air backwash system and perform a separate water backwash. After the set time is reached, close the water backwash system, open the first exhaust device 112 and the second exhaust device 123, and then open the water outlet valve 8 as needed. After the collected water is discharged, open the water inlet valve 7 to allow water in, and the filter tank enters the next filtration cycle. Example 2

[0053] like Figure 11 As shown, the difference between this embodiment and embodiment 1 is that the filter body of this embodiment is a pressure-type filter, the pressure-type filter is a fully sealed structure, the interior of the pressure-type filter can withstand pressure, and the pressure of the water inlet and outlet can be set. A primary filtered water outlet is provided near the bottom of the vertical water collection channel, and a primary filtered water drain pipe is installed on the primary filtered water drain outlet. A valve is installed on the primary filtered water drain pipe. The air backwash system also includes a third exhaust device, which is also provided on the top of the filter body. The third exhaust device is connected to the backwash drain channel. In addition, in this embodiment, the first exhaust device, the third exhaust device and the second exhaust device have the same structure and include a ball valve and an exhaust valve connected in series.

[0054] The specific usage method of this embodiment is consistent with that of Example 1, except that the filter body of this application is a pressure-type filter. During filtration, the water to be treated in the filter body is always under pressure. During backwashing, first close the valve on the water inlet pipe, wait until the liquid level in the vertical water distribution channel drops to the second overflow weir elevation, then close the valve on the water outlet pipe, close the first and second exhaust devices, and open the air backwash system for air washing; when the air backwash reaches the set time, open the water backwash system and perform air-water combined backwashing at the same time; when the air-water combined backwash reaches the set time, close the air backwash system, and perform water backwashing alone. After the set time is reached, close the water backwash system, close the valve of the backwash water inlet pipe, open the first and second exhaust devices, and then open the primary filtered water discharge valve. After the accumulated water in the filter is drained, close the primary filtered water discharge valve, and the filter completes the backwash process.

[0055] The above-mentioned specific embodiments are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product form and style of the above-mentioned specific embodiments. Any appropriate changes or modifications made to them by ordinary technicians in any corresponding technical field that comply with the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A blade-shaped high-efficiency shallow horizontal flow filtration module, comprising a filter body, characterized in that: The filter tank body includes a thin-sheet filter material, a vertical water distribution channel connected to the water inlet, a vertical water collection channel connected to the water outlet, and a horizontal water distribution channel and a horizontal water collection channel; the vertical water distribution channel and the vertical water collection channel are respectively arranged on the two end sides of the thin-sheet filter material in the length direction, and the horizontal water distribution channel and the horizontal water collection channel are respectively arranged on both sides of the width direction of the thin-sheet filter material. The horizontal water distribution channel includes a plurality of independent water inlet channels arranged along the height direction of the thin-sheet filter material, and the horizontal water collection channel includes a plurality of independent water outlet channels arranged along the height direction of the thin-sheet filter material. The water inlet channels and water outlet channels on both sides of the thin-sheet filter material are arranged correspondingly, the water inlet end of the water inlet channel is connected with the vertical water distribution channel, the water outlet end of the water outlet channel is connected with the vertical water collection channel, and the water outlet end of the water inlet channel is connected with the water inlet end of the water outlet channel through the thin-sheet filter material.

2. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 1, characterized in that: The elevation of the water inlet of the vertical water distribution channel is not higher than the elevation of the water inlet channel at the bottom. A first overflow weir is provided at the top of the vertical water collection channel. The elevation of the outlet of the first overflow weir is not lower than the elevation of the water outlet channel at the top. The vertical water collection channel is connected to the drop well through the overflow weir.

3. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 1, characterized in that: The horizontal water distribution channel and the horizontal water collection channel have the same structure and both include an outer baffle, a partition and a first grid. The outer baffle and the first grid are parallel to each other and arranged vertically, the partition is arranged in the horizontal direction, and multiple partitions are arranged in the height direction and fixed between the outer baffle and the first grid, so that independent water flow channels are formed between adjacent partitions; a gap is provided between the first grid of the horizontal water distribution channel and the first grid of the horizontal water collection channel to form a filtration area for placing thin-sheet filter media.

4. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 3, characterized in that: The sheet-type filter material includes a filter brick layer, a supporting layer and a filter layer which are arranged in sequence from bottom to top.

5. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 3, characterized in that: The multiple water inlet channels of the transverse water distribution channel and the multiple water outlet channels of the transverse water collection channel cover both sides of the filter layer of the flaky filter material, and the height of the top and bottom sides of the filter layer of the flaky filter material not covered by the transverse water distribution channel and the transverse water collection channel does not exceed the thickness of the flaky filter material.

6. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 3, characterized in that: The thickness of the sheet filter material is 100 to 500 mm.

7. The blade-shaped high-efficiency shallow horizontal flow filtration module according to any one of claims 3 to 6, characterized in that: The filter body is equipped with an air backwash system and a water backwash system. The top of the filter body is provided with a first exhaust device and a second exhaust device. The first exhaust device is connected to the vertical water distribution channel, and the second exhaust device is connected to the vertical water collection channel.

8. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 7, characterized in that: The water backwash system includes a backwash water inlet and a backwash drainage channel. The top of the filter area is open and the bottom is sealed. An opening is provided on the top of the filter body to communicate with the top opening of the filter area. A removable second grid is also installed in the filter body above the top of the filter area. A gap is provided between the second grid and the top of the thin-film filter material to form a backwash expansion chamber. A backwash drainage channel is provided in the filter body. A second overflow weir is provided on the top of the filter area. The filter area is connected to the inlet of the backwash drainage channel through the second overflow weir. The outlet of the backwash drainage channel is provided on the side of the filter body close to the vertical water distribution channel. A backwash water inlet is provided on the bottom of the filter area close to the vertical water collection channel. The air backwash system includes a backwash air inlet. A backwash air inlet is provided on the bottom of the filter area close to the vertical water distribution channel.

9. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 8, characterized in that: The filter tank body is a gravity filter tank.

10. The blade-shaped high-efficiency shallow horizontal flow filtration module according to claim 8, characterized in that: The filter body is a pressure type filter, and a primary filtered water outlet is provided near the bottom of the vertical water collection channel. The air backwash system also includes a third exhaust device, which is also provided on the top of the filter body and is connected to the backwash drainage channel.

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