Filter tank modification method and filter tank

Abstract

The embodiment of the application provides a filter reconstruction method and a filter. The method is applied to reconstruct a siphon filter. The siphon filter comprises a central water channel for conveying clean water to a downstream. The central water channel is removed from the siphon filter, and an H-shaped groove is built at the position of the removed central water channel. The H-shaped groove comprises a water distribution and air distribution area, which is communicated with a bottom clean water area of the siphon filter, and is suitable for conducting backwash water and backwash air to the bottom clean water area in a backwash stage to backwash a filter material layer of the siphon filter. A backwash fan is additionally arranged in the siphon filter. A backwash air pipe of the backwash fan penetrates through a partition plate of the water distribution and air distribution area of the H-shaped groove and is connected to the water distribution and air distribution area. The backwash fan is suitable for generating backwash air and transmitting the backwash air to the water distribution and air distribution area along the backwash air pipe, so that the backwash air enters the bottom clean water area and air backwashes the filter material layer. The filter reconstruction method provided by the embodiment of the application can improve the filtering water quality effect of the filter at a lower implementation cost.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of water treatment, and in particular to a filter tank reconstruction method and a filter tank. BACKGROUND

[0002] A filter tank is a water treatment device that removes impurities in raw water through a filter material layer to obtain clean water. The filter tank needs to obtain raw water through water inlet and clean the filter material layer through backwashing. At present, the siphon method is commonly used for the filter tank to obtain raw water and backwashing. With the improvement of water quality standards, the water quality of the siphon filter tank gradually cannot meet the requirements. In order to improve the water filtration effect of the filter tank, the siphon filter tank can be removed and a filter tank with higher filtration effect can be newly built to meet the continuously improved water quality standards. However, this new filter tank method needs to spend a lot of time and economic costs, and has the problem of high implementation cost.

[0003] Therefore, how to provide a technical solution to improve the filtration water quality effect of the filter tank with low implementation cost has become a technical problem to be solved in the field. SUMMARY

[0004] Therefore, embodiments of the present application provide a filter tank reconstruction method and a filter tank, which reconstruct the siphon filter tank, improve the filtration effect of the reconstructed filter tank, and reduce the implementation cost.

[0005] In a first aspect, embodiments of the present application provide a filter tank reconstruction method, which is applied to reconstruct a siphon filter tank, and the siphon filter tank is used to transport filtered water downstream and a central water channel for discharging backwashing water; the method comprises:

[0006] The central water channel of the siphon filter tank is removed, and an H-shaped tank is built at the position where the central water channel is removed, the H-shaped tank comprises a water and gas distribution area, the water and gas distribution area is communicated with a bottom clean water area of the siphon filter tank, and is adapted to conduct backwashing water and backwashing gas to the bottom clean water area in a backwashing stage to backwash the filter material layer of the siphon filter tank.

[0007] A backwashing air blower is additionally arranged in the siphon filter tank, to avoid causing structural damage by penetrating through the existing pool wall, a backwashing air pipe of the backwashing air blower penetrates through a partition plate of the water and gas distribution area of the newly built H-shaped tank and enters the water and gas distribution area, and the backwashing air blower is adapted to generate backwashing air and transmit the backwashing air to the water and gas distribution area along the backwashing air pipe, so that the backwashing air enters the bottom clean water area to air backwash the filter material layer.

[0008] In a second aspect, embodiments of the present application provide a filter tank, which is obtained by reconstructing a siphon filter tank, and the siphon filter tank comprises a central water channel for transporting clean water downstream; the filter tank comprises:

[0009] H-shaped groove built at the position where the central water channel is removed, the H-shaped groove comprising a water and air distribution area, the water and air distribution area being communicated with the bottom clear water area of the siphon filter tank, and being adapted to conduct backwash water and backwash air to the bottom clear water area during the backwash stage to backwash the filter material layer;

[0010] A backwash air blower, a backwash air pipe of the backwash air blower penetrating through the partition plate of the water and air distribution area of the H-shaped groove and being connected to the water and air distribution area, the backwash air blower being adapted to generate backwash air and transmit the backwash air along the backwash air pipe to the water and air distribution area, so that the backwash air enters the bottom clear water area to air backwash the filter material layer.

[0011] The filter tank reconstruction method provided by the embodiment of the present application removes the central water channel of the siphon filter tank, builds an H-shaped groove at the position where the central water channel is removed, the H-shaped groove comprising a water and air distribution area, the water and air distribution area being communicated with the bottom clear water area of the siphon filter tank, and being adapted to conduct backwash water and backwash air to the bottom clear water area during the backwash stage to backwash the filter material layer, and a backwash air blower is additionally arranged in the siphon filter tank, a backwash pipe of the backwash air blower penetrating through the partition plate of the water and air distribution area of the H-shaped groove and being connected to the water and air distribution area.

[0012] It can be seen that, when the filter material layer of the filter tank needs to be backwashed due to blockage, the filter tank reconstruction method provided by the embodiment of the present application uses the newly added backwash air blower to penetrate through the partition plate of the water and air distribution area of the newly built H-shaped groove, to conduct backwash air into the water and air distribution area and further into the bottom clear water area communicated with the water and air distribution area, so as to realize air backwash of the filter material layer from the bottom clear water area, and achieve better backwash effect. The embodiment of the present application is based on the siphon filter tank, removes the central water channel of the siphon filter tank, and adds the H-shaped groove to achieve the above-mentioned backwash effect, rather than building a new filter tank with the above-mentioned backwash effect. Therefore, the embodiment of the present application can reconstruct the siphon filter tank based on the existing siphon filter tank by using the filter tank reconstruction method provided by the embodiment of the present application, to obtain a new filter tank with higher filtering effect. Compared with building a new filter tank with the above-mentioned backwash effect, the embodiment of the present application can reduce the implementation cost. Therefore, the embodiment of the present application can reconstruct the siphon filter tank at a lower implementation cost, and improve the filtering water quality effect of the reconstructed filter tank. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on the provided drawings.

[0014] Figure 1a is a plan view of a siphon filter tank;

[0015] Figure 1b is a schematic view of the elevation of the siphon filter tank shown in Figure 1a

[0016] Figure 2a is a schematic view of the H-shaped groove elevation of the filter tank after the filter tank modification method provided by the embodiment of the present application;

[0017] Figure 2b is a schematic view of the water distribution channel plan of the filter tank after the filter tank modification method provided by the embodiment of the present application;

[0018] Figure 2c is a schematic view of the elevation shown in Figure 2b

[0019] Figure 3 is a schematic view of the water outlet well plan of the filter tank after the filter tank modification method provided by the embodiment of the present application;

[0020] Figure 4 is a schematic view of the backwashing water pump plan of the filter tank after the filter tank modification method provided by the embodiment of the present application;

[0021] Figure 5 is a schematic view of the filter plate, filter head and filter material of the filter tank after the filter tank modification method provided by the embodiment of the present application.

[0022] 11-filter tank body; 12-filtered water outlet pipe; 13-inlet water siphon pipe; 14-water distribution channel; 15-inlet water channel; 16-vacuum system; 17-filter material layer; 18-backwashing drainage siphon pipe; 19-central water channel; 191-bottom clear water area; 192-drainage groove; 193-backwashing inlet water pipe; 194-backwashing inlet water valve; 20-homogeneous filter material layer; 21-H-shaped groove; 211-water distribution and air distribution area; 212-water distribution and air distribution area partition; 213-drainage area; 2131-drainage channel; 2132-water suction pipe; 214-supporting column; 215-supporting beam; 22-backwashing air pipe; 23-inlet water gate; 231-inlet water gate plate; 232-backwashing drainage gate plate; 24-externally provided water distribution channel; 241-water distribution weir; 25-water outlet well; 261-water outlet regulating valve; 262-primary filtered water discharge valve; 263-liquid level and blockage indicator; 27-V-shaped groove; 28-backwashing water pump; 29-filter plate; 291-long handle filter head; 210-primary filtered water discharge pipe. DETAILED DESCRIPTION

[0023] ​​The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0024] To facilitate understanding of the embodiments of the present application, first, the existing siphon filter is introduced, please refer to Figure 1a and Figure 1b , Figure 1a is a siphon filter plan; Figure 1b is Figure 1a the elevation view of the siphon filter shown in the figure.

[0025] As shown in the figure, raw water flows in from the water inlet channel 15, enters the water distribution channel 14 in the upper part of the filter through the water inlet siphon pipe 13, flows into the filter tank 11, and then enters the bottom clear water area 191 through the filter material layer 17, thereby flowing into the lower water outlet clear water area of the central water channel 19 connected thereto, and finally flows into the downstream clear water tank through the filtered water outlet pipe 12.

[0026] However, the filter layer contains more and more pollutants during the filtration process, which increasingly blocks the filtration of raw water, and the water level in the filter tank continuously rises. In order to prevent the water level from rising above the predetermined maximum value, it is necessary to reduce the pollutant content of the filter material layer by backwashing operation.

[0027] During backwashing, the vacuum of the water inlet siphon pipe 13 is first broken, so that the water in the water inlet channel 15 no longer enters the water distribution channel 14, and further does not enter the filter tank 11. When the water level in the filter tank drops to the drain groove, the valve of the filtered water outlet pipe 12 is closed to stop the filtered water from being produced by the filter tank; the backwashing water inlet valve 194 of the backwashing water inlet pipe 193 connected to the high-level water tank is opened, and the air in the backwashing drain siphon pipe 18 is extracted by using the vacuum system 16, so that the backwashing drain siphon pipe 18 forms a siphon. By using the water level difference between the high-level water tank and the filter tank, the backwashing process is started. Since the central water channel 19 is connected to the bottom clear water area 191 below the filter material layer, at this time, the clear water in the central water channel 19 will pass through the filter material layer in the reverse direction from bottom to top under the action of water pressure, so as to wash away the dirt and impurities in the filter material layer 17, and the backwashing wastewater above the filter material layer is collected by the drain groove 192 and enters the upper layer of the central water channel 19, enters the water distribution channel 14, and then passes through the backwashing drain siphon pipe 18, and finally is discharged together with the dirt and impurities removed from the filter material layer by the drain channel 2131.

[0028] It should be noted that the clear water in the embodiments of the present application refers to the filtered water after the filter material layer 17 is filtered, the raw water refers to the water to be treated without being filtered by the filter material layer, and the backwashing wastewater refers to the water that becomes sewage again after carrying the dirt and impurities in the filter material layer 17 when the clear water passes through the filter material layer 17 from the bottom of the filter material layer 17 during backwashing.

[0029] When the filter material layer is washed clean, the backwashing water inlet valve 194 of the backwashing water inlet pipe 193 is closed and the vacuum of the backwashing water drainage siphon pipe 18 is broken, the washing is immediately stopped, the backwashing of the siphon filter tank is completed, and the valves of the water inlet siphon pipe 13 and the filtered water outlet pipe 12 can be started again to start filtering again.

[0030] However, there are often the following problems in the actual operation of the siphon filter tank:

[0031] 1) The water level of the high-level water tank is not constant, and the resistance of the filter material layer gradually decreases during the backwashing process, causing the intensity of water backwashing to be unstable;

[0032] 2) The vacuum of the water inlet siphon pipe is often destroyed due to the gradual accumulation of bubbles in the water, causing the water inlet to stop:

[0033] 3) It is difficult to form a drainage vacuum, especially in winter, which affects the backwashing effect:

[0034] 4) There is a lack of air backwashing, and the backwashing effect is poor;

[0035] Due to the above problems, the stable operation of the filter tank is difficult to guarantee, and the backwashing effect is poor, which causes the water quality to fluctuate. Therefore, the backwashing effect of the siphon filter tank is limited, and the effect of reducing the dirt content in the filter material layer is poor, which has gradually failed to meet the increasing water quality standards and the requirements of automatic control of the water treatment system.

[0036] In order to improve the water quality filtering effect of the filter tank, the siphon filter tank is usually removed and a filter tank with higher filtering effect is newly built to meet the increasing water quality standards, but this new building method requires a large amount of time cost and economic cost, and the implementation cost is high.

[0037] Therefore, in order to solve the above technical problems and improve the filtering water quality effect of the filter tank at a lower implementation cost, the embodiments of the present application provide a filter tank modification method. The filter tank modification method provided by the embodiments of the present application can be applied to the modification of a siphon filter tank. For details, please refer to Figure 1a and Figure 1b , refer to Figure 2a 、 Figure 2b and Figure 2c , Figure 2a is a H-shaped groove elevation schematic view of the modified filter tank according to the filter tank modification method provided by the embodiments of the present application. Figure 2bThe water distribution channel plane schematic diagram of the filter after the filter reconstruction method provided by the embodiment of the application is reconstructed is shown in the figure. Figure 2c For Figure 2b The elevation schematic diagram is shown in the figure.

[0038] It is worth noting that, in order to distinguish the prior art from the technical solutions provided by the application, the structure in the prior art is represented by a number "1" at the beginning of the reference sign, and the structure of the technical solutions provided by the application is represented by a number "2" at the beginning of the reference sign.

[0039] As shown in the figure, the filter reconstruction method of the embodiment of the application removes the center water channel 19 of the siphon filter, and builds an H-shaped groove 21 at the position of the removed center water channel 19. The H-shaped groove 21 includes a water distribution and gas distribution area 211, which is communicated with the bottom clear water area 191 of the siphon filter, and is suitable for conducting backwash water and backwash gas to the bottom clear water area 191 in the backwash stage, so as to backwash the filter material layer 17 of the siphon filter.

[0040] In addition, the filter reconstruction method of the embodiment of the application adds a backwash fan to the siphon filter. The backwash gas pipe 22 of the backwash fan penetrates through the water distribution and gas distribution area partition plate 212 of the H-shaped groove 21 and accesses the water distribution and gas distribution area 211. The backwash fan is suitable for generating backwash gas and transmitting the backwash gas along the backwash gas pipe 22 to the water distribution and gas distribution area 211, so that the backwash gas enters the bottom clear water area 191 and performs air backwashing on the filter material layer 17.

[0041] The center water channel 19 of the siphon filter has many reconstruction contents and complex construction. In order to ensure the reconstruction quality, the center water channel 19 can not be partially reconstructed, but completely removed, and the H-shaped groove 21 is newly built. The H-shaped groove 21 is divided into different areas above and below by the water distribution and gas distribution area partition plate 212 located in the middle. The water distribution and gas distribution area 211 is located below the water distribution and gas distribution area partition plate 212. Since the H-shaped groove 21 is built at the position of the removed center water channel 19, and the center water channel 19 is communicated with the bottom clear water area 191, it is easy to make the water distribution and gas distribution area 211 communicated with the bottom clear water area 191.

[0042] In some embodiments, the center water channel 19 is connected to the top load-bearing beam, which bears the load of the top building. When the center water channel 19 is removed, the impact on the safety of the upper load-bearing beam and the top building structure must be considered; based on this, one implementation of building the H-shaped groove 21 at the position where the center water channel 19 is removed can be: a temporary support can be first supported in the siphon filter tank body under the upper beam support beam 215; the center water channel 19 is completely removed; the pool wall is separated from the upper beam, and a support column 214 is built to form a “T” structure with the support beam 215, and the upper width is the same as the outer wall interval of the original center water channel 19 pool wall, so that the original stress condition of the load-bearing beam is basically unchanged, the support beam 215 is provided with a steel plate and connected to the top building, and can be clamped with an inclined iron wedge to prevent loose connection and structure stress.

[0043] After the backwashing fan is set, the backwashing fan can generate backwashing gas for air backwashing, but in order to be able to transmit the backwashing gas to the bottom clean water area 191 located at the bottom of the filter material layer 17, so that the backwashing gas can backwash the filter material layer 17 from bottom to top, the backwashing gas pipe 22 is also needed to transmit the backwashing gas to the bottom clean water area 191. But the bottom clean water area 191 is located at the bottom of the filter material layer 17 and is wrapped by the filter tank body, so it is difficult for the backwashing gas pipe 22 to be directly connected to the bottom clean water area 191. Therefore, a water distribution and gas distribution area 211 is arranged in the newly built H-shaped groove 21 to communicate with the bottom clean water area 191, so that the backwashing gas pipe 22 only needs to communicate with the water distribution and gas distribution area 211 to transmit the backwashing gas to the bottom clean water area 191.

[0044] Optionally, in order to facilitate the communication between the backwashing gas pipe 22 and the water distribution and gas distribution area 211, a hole through which the backwashing gas pipe 22 passes can be reserved when the water distribution and gas distribution area partition plate 212 is constructed, and the hole is sealed after the backwashing gas pipe 22 passes through the hole to reach the water distribution and gas distribution area 211, so as to isolate the upper and lower areas of the H-shaped groove. In this way, when the backwashing gas pipe 22 is connected, the hole through which the backwashing gas pipe 22 passes can be avoided to be opened on the filter tank wall, thereby avoiding the damage to the original filter tank wall structure and the increase of the risk of water leakage.

[0045] It is worth noting that a plurality of gas distribution pipes can also be arranged in the water distribution and gas distribution area 211, which are uniformly connected to each part of the bottom clean water area 191. In this way, after the backwashing gas reaches the water distribution and gas distribution area 211 through the backwashing gas pipe 22, it enters each part of the bottom clean water area 191 through the gas distribution pipe, so as to uniformly air backwash the filter material layer 17 on the bottom clean water area 191, thereby avoiding the instability of the clean water quality caused by the uneven air backwashing of the filter material layer.

[0046] Due to the air backwashing, the filter material can be further replaced to improve the filtering capacity of the dirt, please refer to Figure 5 , Figure 5The filter plate, filter head and filter material of the filter after the reconstruction by the filter reconstruction method provided in the embodiments of the present application are shown in the figure.

[0047] As shown in the figure, in a specific embodiment, the filter material in the siphon filter filter material layer 17 is removed and replaced with homogeneous quartz sand. In order to distinguish the two different filter material layers, the filter material layer replaced with homogeneous quartz sand is referred to as the homogeneous filter material layer 20. The filter plate of the siphon filter is removed and a new filter plate 29 is built at the removed position. The filter plate 29 includes filter head holes, and the filter head holes accommodate long-handle filter heads 291 suitable for air-water backwashing.

[0048] It is worth noting that, in some embodiments, in order to prevent damage to the filter pool body structure caused by the newly added filter plate 29, the filter plate 29 can be an external filter plate that is not rigidly connected to the filter pool body, ensuring that no stress is transmitted, and a sealing material is provided between the filter plate and the pool wall to avoid gaps. In this way, damage to the filter pool body structure caused by the newly added filter plate can be prevented.

[0049] In this way, the replacement of the filter material can improve the water purification and filtration capacity, and the filter plate 29 provided with the long-handle filter heads 291 can ensure that the filter plate 29 remains flat during long-term use, is suitable for forming an air cushion layer and uniform water and air distribution during air-water backwashing, and has no dead water area between the long-handle filter heads 291 and the filter plate 29, thereby having better backwashing effect.

[0050] Of course, the filter reconstruction method provided in the embodiments of the present application can realize air backwashing while not affecting the original water backwashing of the siphon filter, so that air backwashing and water backwashing can be performed simultaneously, the backwashing air forms bubbles in the backwashing water, and the backwashing is performed by means of bubble water, thereby better removing impurities in the homogeneous filter material layer 20.

[0051] In some embodiments, a backwashing drainage gate 232 can be added, so that the drainage gate 232 is controlled to be closed during the filtration stage to prevent raw water from flowing directly into the drainage channel 2131, and the backwashing drainage gate 232 is controlled to be opened during the backwashing stage, so that the raw water after backwashing flows into the drainage channel 2131 through the drainage area 213.

[0052] In some embodiments, part of the channel wall of the inlet channel can be cut off to form an overflow weir, which is suitable for overflowing the raw water in the inlet channel to the drainage channel 2131 located at the bottom of the inlet channel.

[0053] In this way, when excess raw water is obtained in the inlet channel, the excess raw water can be discharged to the drainage channel 2131 in time, preventing damage to the filter structure and filtration function, and facilitating the filter to have constant water inlet pressure.

[0054] It can be seen that the filter pool reconstruction method provided in the embodiments of the present application can realize air backwashing of the filter material layer from the bottom clear water area 191 through the newly added backwashing fan, the newly built H-shaped groove 21, the water distribution and air distribution area partition plate 212, the water distribution and air distribution area 211, the bottom clear water area 191, and the filter plate 29 provided with a long handle filter head 291, so that a better backwashing effect is achieved. The embodiments of the present application are based on the siphon filter pool, the central water channel 19 is removed, and the H-shaped groove 21 and the filter plate 29 are newly built to achieve the above-mentioned backwashing effect, instead of building a new filter pool with the above-mentioned backwashing effect. Therefore, the embodiments of the present application can reconstruct the siphon filter pool to have a higher filtering effect based on the existing siphon filter pool by using the filter pool reconstruction method provided in the embodiments of the present application. Compared with building a new filter pool with the above-mentioned backwashing effect, the embodiments of the present application can reduce the implementation cost. Therefore, the embodiments of the present application can reconstruct the siphon filter pool at a lower implementation cost and improve the filtering water quality effect of the reconstructed filter pool.

[0055] It is worth noting that the water inlet siphon pipe vacuum is destroyed by the gradual accumulation of bubbles in the water, which stops water inlet. In order to prevent the vacuum of the water inlet siphon pipe of the siphon filter pool from being disturbed, causing unstable system operation, in a specific embodiment, the filter pool reconstruction method provided in the embodiments of the present application can also open a water inlet gate in the water inlet channel of the siphon filter pool, and the water inlet gate is communicated with the water distribution channel of the siphon filter pool.

[0056] Please continue to refer to Figure 2b and Figure 2c As shown in the figure, the water inlet channel of the siphon filter pool is adjacent to the water distribution channel, and after the water inlet gate 23 is opened in the water inlet channel 15, raw water can enter the water distribution channel 14 through the water inlet gate 23. When backwashing is needed, the gate can be closed to prevent raw water from continuing to enter the filter pool body.

[0057] In some embodiments, a water inlet gate plate 231 can be added to control the opening and closing of the water inlet gate 23.

[0058] In this way, the water inlet siphon pipe can be avoided during the process of raw water entering the water distribution channel 14 from the water inlet channel 15, so that stable water inlet is not caused by the vacuum of the water inlet siphon pipe being easily disturbed. Of course, in some embodiments, the water inlet siphon pipe can be removed to simplify the siphon filter pool; in other embodiments, the water inlet siphon pipe can be retained to retain two different water inlet modes, while saving reconstruction time and money.

[0059] It is worth noting that the siphon filter described in the present application refers to the filter before the reconstruction, and the filter after the reconstruction can not use the siphon principle.

[0060] In order to make the siphon filter have a stable water level, please continue to refer to Figure 2b and Figure 2c The filter reconstruction method provided by the embodiments of the present application can also remove the water distribution channel 14 of the siphon filter; an external water distribution channel 24 is arranged, which extends to both sides of the filter tank body of the siphon filter, and is connected with the water inlet gate 23; a water distribution weir 241 is arranged in the external water distribution channel 24, which is suitable for uniform water inflow of the siphon filter.

[0061] The water distribution channel 14 of the siphon filter usually does not extend to both sides of the filter tank body, and it is difficult to achieve uniform water inflow of the entire filter tank body, so the water distribution channel 14 of the siphon filter is removed, and the external water distribution channel 24 is arranged. The external water distribution channel 24 can be a newly constructed concrete water distribution channel on the filter tank body, but as a more optimal choice, in some embodiments, the external water distribution channel 24 can be constructed by stainless steel or other materials, and is externally arranged on the siphon filter tank body by hanging connection or other means. In this way, the difficulty in connecting the channel body and the problem of easy leakage caused by supplementing the complete channel based on the water distribution channel 14 of the siphon filter using concrete or steel structure can be avoided.

[0062] In this way, by arranging the external water distribution channel 24 and the water distribution weir 241, the filter can have a stable water inflow level, and the raw water can uniformly flow into the filter tank body.

[0063] Further, in order to make the siphon filter have a stable water level, so that the filter has a constant water level and a constant flow, the embodiments of the present application can also add a water outlet well in the water outlet clear water area of the siphon filter. Please refer to Figure 3 , Figure 3 The filter reconstruction method provided by the embodiments of the present application can also add a water outlet well in the water outlet clear water area of the siphon filter. Please refer to

[0064] As shown in the figure, the filter reconstruction method provided by the embodiments of the present application can also add a water outlet well 25 in the pipe gallery where the filtered water outlet pipe 12 of the siphon filter is located, and a water outlet weir is arranged in the water outlet well 25, which is suitable for providing a stable filtered water level.

[0065] In order to realize constant water level filtration, please continue to refer to Figure 3 .

[0066] As Figure 3 shown, in a specific embodiment, it also includes: setting an adjusting valve 261, a liquid level and a blockage indicator 263.

[0067] In this way, the current liquid level and whether the homogeneous filter material layer 20 is blocked can be found in time according to the liquid level and blockage indicator 263, and the water outlet speed of the water outlet well 25 can be controlled by the regulating valve 261, so as to control the filtering water level above the homogeneous filter material layer 20.

[0068] In this way, by arranging the water outlet well 25 with a water outlet weir in the water outlet clear water area, the water outlet water level can be controlled, so as to provide a stable water level for the filter tank. The filter tank is suitable for being matched with the regulating valve 261 and the liquid level and blockage indicator 263, so that the filter tank has a stable inlet and outlet water filtering water level at the same time, thereby having a stable water pressure and flow rate, and realizing constant water level and equal filter speed filtering.

[0069] It is worth noting that in some embodiments, the signal of the liquid level and blockage indicator 263 can also be received by a computer to automatically control the regulating valve 261, so as to realize intelligent control of the water level and better realize constant water level.

[0070] When the dirt of the filter material layer reenters the raw water in the filter tank body through backwashing, the backwashing drainage layer of the H-shaped groove needs to enter the drainage channel 2131. In order to make the backwashing raw water flow into the drainage channel 2131 as soon as possible, please refer to Figure 2a and Figure 2c .

[0071] As shown in the figure, in a specific embodiment, it further includes: an externally-arranged V-shaped groove 27 is newly added on both sides of the filter tank body of the siphon filter tank, the externally-arranged V-shaped groove 27 is in communication with the externally-arranged water distribution channel, and a surface sweeping hole is opened on the groove bottom of the externally-arranged V-shaped groove 27, which is suitable for obtaining the raw water of the externally-arranged water distribution channel and entering the filter tank body through the surface sweeping hole and the groove opening of the externally-arranged V-shaped groove 27.

[0072] In this way, in the filtering stage, the raw water in the externally-arranged water distribution channel 24 can flow into the filter tank body through the V-shaped groove, and in the backwashing stage, the raw water can more quickly and completely enter the drainage area of the upper part of the H-shaped groove when flowing into the filter tank body through the sweeping hole opened on the groove bottom of the V-shaped groove, and then flow into the drainage channel 2131 through the drainage area and flow out of the filter tank, thereby improving the backwashing effect.

[0073] In order to make the backwashing water more stable, please refer to Figure 4 , Figure 4 The backwashing water pump plane schematic diagram of the filter tank after the filter tank reconstruction method provided by the embodiment of the application is reconstructed.

[0074] As shown in the figure, the filter tank reconstruction method provided by the embodiment of the application further includes:

[0075] The high water tank of the siphon filter is removed, the high water tank absorbs filtered water in the downstream clean water tank through the clean water tank suction pipe to supplement the backwash water, and the filtered water is input to the water distribution and air distribution area through the backwash inlet pipe during the backwash stage; a backwash water pump 28 is added at the original position of the high water tank, the backwash water pump obtains filtered water from the downstream clean water tank through the clean water tank suction pipe, and the filtered water is input to the water distribution and air distribution area through the backwash inlet pipe.

[0076] In the embodiment, the booster water pump is replaced by the backwash water pump 28 in situ, the backwash water pump is still connected with the clean water tank suction pipe 2132 of the clean water tank, and the backwash water is provided to the filter tank through the backwash inlet pipe 193.

[0077] Specifically, the backwash water pump 28 can adopt a single-stage double-suction centrifugal pump form, be controlled by frequency conversion, and be controlled by the feedback signal of the electromagnetic flow meter added after the pump, so that the flow and pressure of the backwash water are more stable.

[0078] In this way, in the scheme in which the booster water pump supplies water to the high water tank through the clean water tank suction pipe 2132 connected with the clean water tank, and the high water tank provides backwash water to the filter tank through the backwash inlet pipe 193 during the backwash of the filter tank, the water level of the high water tank is unstable, and the resistance of the filter material layer gradually decreases during the backwash process, which causes the intensity of water backwashing to be unstable and affects the backwashing effect. Meanwhile, by removing the high water tank of the siphon filter, the backwash water pump 28 is arranged at the original position of the booster water pump and can still be connected with the clean water tank suction pipe 2132 and directly provide backwash water with stable flow and pressure to the filter tank through the backwash inlet pipe 193, so that the modification cost is reduced.

[0079] It is worth noting that the backwash water pump is installed at a position higher than the water level of the downstream clean water tank. Therefore, in a specific embodiment, a vacuum pump matched with the original booster water pump can also be used to extract the clean water in the suction pipe to the full water condition.

[0080] In this way, by arranging the vacuum pump, it can be prevented that the backwash water pump 28 has no clean water during the starting stage, so that the backwashing function cannot be realized.

[0081] Because of the air backwashing and more stable water backwashing, the filter material can be further replaced to improve the filtering capacity for stains, please refer to Figure 5 , Figure 5 The filter plate, filter head and filter material of the filter tank after the modification method provided by the embodiment of the application is shown in the schematic view.

[0082] It is worth noting that due to the difficulty of forming a drainage vacuum of the drainage siphon, especially in winter, the backwashing effect will be affected, so the drainage process can remove the drainage siphon, directly use the backwashing drainage flap 232, and discharge the backwashing wastewater from the H-shaped groove to the drainage channel 2131 outside the filter tank.

[0083] In order to improve the quality of filtered water, in a specific embodiment, it further comprises:

[0084] A primary filtered water discharge pipe 210 is added to the filter tank, which is connected to the filtered water pipe 12 and the drainage channel 2131.

[0085] The primary filtered water refers to the clean water obtained by primary filtration within a certain period of time after backwashing is completed. Since the filtration process is restored at the initial stage after backwashing, there are still some pollutants that have not been washed out in the filter material layer, and at this time, the pores between the filter materials are relatively large, and the filtration retention and adhesion have not yet fully played a role. Therefore, the filtered water at the initial stage of filtration will have temporary fluctuations in water quality.

[0086] Therefore, the primary filtered water discharge pipe 210 connected to the filtered water pipe 12 and the drainage channel 2131 is provided, so that the primary filtered water is drained from the filtered water pipe 12 to the drainage channel 2131, instead of flowing into the clean water tank through the water outlet well 25. Specifically, a primary filtered water discharge valve 262 can be provided on the primary filtered water discharge pipe 210, and the primary filtered water discharge pipe 210 is opened when the primary filtered water is filtered after backwashing is completed, and the primary filtered water discharge pipe 210 is closed after the primary filtered water is filtered.

[0087] In this way, when the filter tank is set, the primary filtered water is not directed to the water outlet well 25, but is discharged through the newly added primary filtered water discharge pipe 210, so as to ensure the stability of the filtered water quality. The discharged primary filtered water can be returned to the front end of the water treatment process for further treatment.

[0088] It is worth noting that the definition of a siphon filter tank is generally a filter tank that utilizes the siphon principle, and in some embodiments provided in the present application, in order to further improve the water quality filtration effect of the siphon filter tank, the inlet water siphon pipe 13 and the backwashing drainage siphon pipe 18 have been removed, and the siphon principle is no longer used for filtration. However, in order to facilitate description, the modified filter tank is still referred to as a siphon filter tank in the embodiments of the present application.

[0089] In order to obtain the best filtering effect, the embodiments provided by the present application can be combined, that is, while the H-shaped groove is built, the external water distribution channel is modified, the adjusting valve, the liquid level and the blocking indicator are arranged, the external V-shaped groove is arranged, the backwashing water pump is replaced, the average quartz sand filter material is replaced, the filter plate containing the long handle filter head suitable for air-water backwashing is arranged, and the primary filtered water discharge pipe is arranged. After the siphon filter pool is modified by the modification method provided by the embodiments of the present application, the siphon filter pool has the V-shaped groove on both sides, air-water backwashing can be realized, various indicators and valves can be automatically controlled, the filtering process can be automatically adjusted according to the water level in the pool, constant water level filtering is realized, the definition and standard of the V-shaped filter pool are substantially met, and the V-shaped filter pool can be considered.

[0090] Therefore, it can be considered that the embodiments of the present application provide a method for modifying the siphon filter pool into the V-shaped filter pool at a low cost. Compared with the method of directly removing the siphon filter pool and rebuilding the V-shaped filter pool in order to meet the improved water quality standard, the embodiments of the present application can significantly reduce the time and economic cost.

[0091] The embodiments of the present application also provide a filter pool, which is obtained by modifying a siphon filter pool, and the siphon filter pool comprises:

[0092] The H-shaped groove 21 is built at the removed position of the central water channel 19, the H-shaped groove 21 comprises a water and gas distribution area 211, the water and gas distribution area 211 is communicated with the bottom clear water area 191 of the siphon filter pool, and is suitable for conducting the backwashing water and the backwashing gas to the bottom clear water area 191 in the backwashing stage to backwash the filter material layer 17.

[0093] The backwashing air blower is arranged, the backwashing air pipe 22 of the backwashing air blower penetrates through the water and gas distribution area partition plate 212 of the H-shaped groove and accesses the water and gas distribution area 211, the backwashing air blower is suitable for generating the backwashing air and transmitting the backwashing air to the water and gas distribution area 211 along the backwashing air pipe 22, so that the backwashing air enters the bottom clear water area 191 and air backwashes the filter material layer 17.

[0094] In a specific embodiment, the filter pool further comprises:

[0095] The water inlet gate is arranged in the water inlet channel of the siphon filter pool, and the water inlet gate is communicated with the water distribution channel of the siphon filter pool.

[0096] In a specific embodiment, the filter pool further comprises:

[0097] The external water distribution channel extends to both sides of the filter pool body of the siphon filter pool and is connected with the water inlet gate.

[0098] A water distribution weir is arranged in the outer water distribution channel and is adapted to uniformly feed water into the siphon filter tank.

[0099] In an embodiment, the filter tank further comprises:

[0100] A water outlet well is arranged in the water outlet clear water area of the siphon filter tank, and a water outlet weir is arranged in the water outlet well to provide a stable backwashing water level.

[0101] In an embodiment, the filter tank further comprises:

[0102] An adjusting valve, a liquid level indicator and a blockage indicator are arranged.

[0103] In an embodiment, the filter tank further comprises:

[0104] An outer V-shaped groove is arranged on both sides of the filter tank body of the siphon filter tank and is in communication with the outer water distribution channel. A surface sweeping hole is arranged in the groove bottom of the outer V-shaped groove to obtain raw water from the outer water distribution channel and to enter the filter tank body through the surface sweeping hole and the groove opening of the outer V-shaped groove.

[0105] In an embodiment, the filter tank further comprises:

[0106] A backwashing water pump is arranged at the original position of the high-level water tank of the siphon filter tank and is adapted to obtain filtered water from the downstream clear water tank through the clear water tank suction pipe and to input the filtered water into the water distribution and air distribution area through the backwashing water inlet pipe.

[0107] In an embodiment, the filter tank further comprises:

[0108] The filter material in the filter material layer is homogeneous quartz sand.

[0109] An outer filter plate is arranged at the removal position of the filter plate of the siphon filter tank and comprises a filter head hole in which a long handle filter head adapted to air-water backwashing is arranged.

[0110] In an embodiment, the filter tank further comprises:

[0111] A primary filtered water discharge pipe is connected to the filtered water outlet pipe of the siphon filter tank and the water discharge channel of the siphon filter tank, and the filtered water outlet pipe is connected to the water outlet clear water area.

[0112] It can be seen that when the filter material layer of the filter tank provided in the embodiment of the present application needs to be backwashed, the newly added backwashing fan conducts backwashing air through the water and air distribution area partition plate 212 of the newly built H-shaped groove 21 into the water and air distribution area 211, and further into the bottom clean water area 191 in communication with the water and air distribution area 211, so as to realize air backwashing of the filter material layer from the bottom clean water area 191, and achieve better backwashing effect. The filter tank of the embodiment of the present application is based on the siphon filter tank, the central water channel 19 of the siphon filter tank is removed, and the H-shaped groove 21 and the filter plate 29 provided with a long handle filter head are newly added to achieve the above-mentioned backwashing effect. Therefore, the embodiment of the present application can be used to transform the siphon filter tank with higher filtering effect based on the existing siphon filter tank. Compared with newly building a new filter tank with the above-mentioned backwashing effect, the embodiment of the present application can reduce the implementation cost. Therefore, the embodiment of the present application can transform the siphon filter tank at a lower implementation cost, and improve the filtering water quality effect of the transformed filter tank.

[0113] The above describes the multiple embodiment schemes provided by the embodiment of the present application. The optional modes introduced in each embodiment scheme can be combined, cross-referenced without conflict, thereby extending multiple possible embodiment schemes, which can be considered as the embodiment schemes disclosed and disclosed by the embodiment of the present application.

[0114] Although the embodiment of the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A filter basin retrofit method, characterized by, The method is applied to the reconstruction of a siphon filter, which comprises a central water channel for conveying clean water downstream; the method comprises: removing the central water channel of the siphon filter, and building an H-shaped groove at the position of the removed central water channel, wherein the H-shaped groove comprises a water and air distribution area, which is communicated with a bottom clean water area of the siphon filter, and is adapted to conduct backwash water and backwash air to the bottom clean water area in a backwash stage to backwash the filter material layer of the siphon filter; adding a backwash air blower to the siphon filter, wherein a backwash air pipe of the backwash air blower penetrates through a partition plate of the water and air distribution area of the H-shaped groove and enters the water and air distribution area, and the backwash air blower is adapted to generate backwash air and transmit the backwash air along the backwash air pipe to the water and air distribution area, so that the backwash air enters the bottom clean water area to air backwash the filter material layer; wherein the removing the central water channel of the siphon filter comprises: setting a support beam and a temporary support in the siphon filter body; the temporary support is supported under the support beam; removing the central water channel; building a support column; the support column and the support beam form a T-shaped structure, and the upper part of the support column has the same width as the interval between the outer wall of the pool wall of the central water channel; the support beam is provided with a steel plate and a top building connection, and an inclined iron wedge is arranged.

2. The filter cell retrofit method of claim 1, wherein, Further comprising: opening an inlet gate in the inlet channel of the siphon filter, and the inlet gate is communicated with the water distribution channel of the siphon filter.

3. The filter cell retrofit method of claim 2, wherein, Further comprising: completely removing the water distribution channel of the siphon filter; adding an external water distribution channel, which extends to both sides of the filter body of the siphon filter, and the external water distribution channel is connected with the inlet gate; adding a water distribution weir in the external water distribution channel, which is adapted to uniformly feed water into the siphon filter.

4. The filter cell retrofit method of claim 3, wherein, Further comprising: adding an outlet well in the outlet clean water area of the siphon filter, and an outlet weir is arranged in the outlet well, which is adapted to provide a stable outlet water level.

5. The filter cell retrofit method of claim 4, wherein, Further comprising: adding an adjusting valve, a liquid level and a blockage indicator.

6. The filter cell retrofit method of claim 3, wherein, Further comprising: adding external V-shaped grooves on both sides of the filter body of the siphon filter, wherein the external V-shaped grooves are communicated with the external water distribution channel, the bottom of the external V-shaped grooves is provided with surface sweeping holes, which are adapted to obtain raw water of the external water distribution channel, and the raw water enters the filter body through the surface sweeping holes and the groove opening of the external V-shaped grooves.

7. The filter cell retrofit method of claim 1, wherein, Further comprising: removing the high-level water tank of the siphon filter, which is adapted to supplement backwash water by the filtered water in the downstream clean water tank through the clean water tank suction pipe, and to input the filtered water into the water and air distribution area through the backwash inlet pipe in the backwash stage; adding a backwash water pump at the original position of the high-level water tank, which is adapted to obtain filtered water from the downstream clean water tank through the clean water tank suction pipe, and to input the filtered water into the water and air distribution area through the backwash inlet pipe.

8. The filter cell retrofit method of claim 7, wherein, Further comprising: retaining the vacuum pump of the siphon filter, which is connected with the clean water tank suction pipe, and is adapted to fill the clean water tank suction pipe with clean water before the backwash water pump is started.

9. The filter cell retrofit method of any one of claims 1-8, characterized in that, Further comprising: removing the filter material in the filter material layer of the siphon filter, and replacing the filter material with homogeneous quartz sand. Further comprising: The filter plate of the siphon filter tank is removed, and an external filter plate is newly built at the removed position, the external filter plate comprising filter head holes, and long-handle filter heads suitable for air-water backwashing are contained in the filter head holes.

10. The filter cell retrofit method of claim 4, wherein, Also included are: A new primary filtered water discharge pipe is added to the siphon filter tank, the primary filtered water discharge pipe being connected with an original filtered water outlet pipe and a drainage channel, and the original filtered water outlet pipe being connected with the clear water area.

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