A water treatment method based on a v-type filter

Abstract

The application discloses a water treatment method based on a V-shaped filter tank. The traditional V-shaped filter tank is water-distributed through two V-shaped grooves, the area of each filter tank is large, and the water quality is threatened; and a central drainage ditch occupies a large space, causing waste of land area. The application sets a row of water distribution pipes on the surface of the filter tank, changes the water drainage mode of the traditional V-shaped filter tank through two V-shaped grooves, and forms a planar water distribution system on the surface of the filter bed by the water distribution perforated pipes F; the bottom space bears the functions of backwashing water distribution and air distribution, the upper water drainage area is cancelled, and is changed into an effective filtering space, and the backwashing wastewater is borne by the water drainage grooves arranged on the two sides; a lifting weir plate is arranged outside the water drainage groove, and the height of the weir plate can be increased within a certain range through linkage with a high-precision water temperature sensor. The application improves the uniformity of the water distribution of the filter tank through planar water distribution on the surface of the filter bed, and the bottom space bears the functions of backwashing water distribution and air distribution, and the effective filtering area of the filter tank is increased.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically relating to a water treatment method based on a V-type filter. Background Technology

[0002] V-type filters are a type of rapid sand filter, named for their V-shaped inlet trough. They use homogeneous filter media, also known as uniform granular media filters. Due to their large pollutant interception capacity and long filtration cycle, they employ air-water backwashing and have been widely used in various water plants in recent years. The main structure of a V-type filter includes a filter media layer, a support layer, an inlet V-shaped trough, a collection channel, a central drainage channel, a backwash inlet pipe, and an air inlet pipe. After a period of filtration, the filter undergoes backwashing, and the backwash wastewater flows out through the central drainage channel.

[0003] like Figure 5 As shown, traditional V-type filters distribute water through V-shaped channels on both sides. However, each filter cell has a large area. During water distribution, the filter bed near the V-shaped channel has a shorter flow path and filters a larger volume of water per unit time. This poses a risk of impurities penetrating the filter layer during later operation, threatening water quality. The central drainage channel of traditional V-type filters occupies a large space, which cannot support the filtration function during operation, resulting in wasted land area and becoming a constraint under increasingly tight land conditions. During winter operation, the lower water temperature increases the kinematic viscosity of the water flow. Under the same rinsing intensity, the expansion rate of the traditional V-type filter layer will increase, making the filter prone to sand runoff. In the later maintenance of traditional V-type filters, the inner wall of the inlet channel is easy to clean, but the cleaning holes are difficult to clean. After long-term operation, impurities and dirt in the inlet water will clog the cleaning holes, resulting in the loss of surface cleaning function. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a water treatment method based on a V-shaped filter bed, which improves the uniformity of water distribution in the filter bed by using surface water distribution on the filter bed surface; the bottom space undertakes the functions of backwash water distribution and air distribution, thereby increasing the effective filtration area of ​​the filter bed.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A water treatment method based on a V-type filter, characterized in that:

[0007] During the filtration process, the filter bed effluent control valve Q2 is opened, and the backwash inlet control valve P1 is closed;

[0008] The filtered water is transported through the inlet pipe I of the filter tank, flows into the inlet channel A, passes through the inlet gate B, and flows into the distribution channel D; the filtered water enters the perforated distribution pipe F through the distribution channel D; after the filtered water enters the filter bed, it passes through the filter material layer T, the support layer U, and the long-handled filter head V and enters the backwash water and air distribution channel and the collection channel N of the filter tank.

[0009] The filtered water flows out through the backwash water and air distribution channel and the collection channel N of the filter tank, and then enters the filter tank outlet water seal well Q3 through the backwash water inlet pipe and the filtered water outlet pipe O and the filter tank outlet pipe Q1. Finally, it flows out through the filter tank outlet main pipe Q4 to complete the filtration process.

[0010] The backwashing process includes: backwashing air washing, backwashing water washing, and backwashing air-water combined washing. Surface washing accompanies the entire backwashing process.

[0011] During the backwashing process, the backwashing gas enters the filter bed through the backwashing air inlet pipe R2, the backwashing air inlet control valve R1, the backwashing water and air distribution channel and the water collection channel N, the backwashing water distribution channel air inlet W1, and the long-handled filter head V.

[0012] During the backwashing process, the backwash water enters the filter bed through the backwash inlet pipe P2, the backwash inlet pipe control valve P1, the filter tank backwash inlet pipe and the filtered outlet pipe O, the backwash water and air distribution channel and the collection channel N, the backwash water distribution channel inlet W2, and the long-handled filter head V. During the backwashing air-water combined flushing process, the backwash air and water are distributed according to the above-mentioned pathways, and finally, the backwashing water is used to complete the entire backwashing process. The surface flushing water enters the filter bed through the surface flushing water pipe maintenance valve E2 and the surface flushing perforated inlet pipe K, and is used to flush the dirt and impurities floating on the backwash to both sides of the filter tank.

[0013] Both backwash wastewater and surface flushing water flow into the backwash collection tank S through the lifting weir plate H, then flow into the wastewater outlet channel L from the backwash collection tank S, and finally flow out through the backwash wastewater outlet pipe J.

[0014] Furthermore, when the water temperature is low in winter, the water temperature sensor X in the filter tank is linked with the liftable weir plate H to adjust the distance H1 between the top of the weir plate and the top of the filter media layer, so that H1 > the thickness L of the filter media layer after expansion.

[0015] Furthermore, during the backwashing process, when localized sand leakage occurs, the sand settles in the sand collection pit M.

[0016] Furthermore, after running for a period of time, remove the maintenance valves E1 at both ends of the perforated water distribution pipe F, and use high-pressure water to flush the water distribution holes on the perforated water distribution pipe F.

[0017] Furthermore, the V-shaped filter used in the water treatment method includes a filter inlet pipe I, which is connected to an inlet channel A; an inlet gate B is installed between the inlet channel A and the distribution channel D.

[0018] A row of perforated water distribution pipes F is arranged along the width of the filter tank on one side of the water distribution channel D. The perforated water distribution pipes F are connected to the water distribution channel D. A pre-embedded water distribution steel pipe joint C and a water distribution pipe maintenance valve E1 are respectively installed at both ends of the perforated water distribution pipes F.

[0019] A filter media layer T is provided below the water distribution perforated pipe F, and a support layer U and a long-handled filter head V are provided below the filter media layer T.

[0020] The bottom of the filter tank is equipped with a backwash water and air distribution channel and a water collection channel N; the backwash water and air distribution channel and the water collection channel N are connected to the filter tank backwash inlet pipe and the filtered water outlet pipe O; the ends of the filter tank backwash inlet pipe and the filtered water outlet pipe O are respectively connected to the filter tank outlet pipe Q1 and the backwash inlet pipe P2; the filter tank outlet pipe Q1 is connected to the filter tank outlet water seal well Q3; the filter tank outlet water seal well Q3 is connected to the filter tank outlet main pipe Q4; a filter tank outlet control valve Q2 is installed on the filter tank outlet pipe Q1.

[0021] A backwash inlet control valve P1 is installed on the backwash inlet pipe P2 to control the on / off of the backwash inlet water.

[0022] The backwash water and air distribution channel and the water collection channel N are simultaneously connected to the backwash air inlet pipe R2. The backwash air inlet pipe R2 is equipped with a backwash air inlet control valve R1 to control the backwash air inlet on and off.

[0023] The bottom of the backwash water distribution and air distribution channel and the water collection channel N are provided with a backwash water distribution channel air inlet W1 and a backwash water distribution channel water inlet W2;

[0024] Backwash collection tanks S are installed on both sides inside the filter tank, and a lifting weir plate H is installed on the outside of the backwash collection tanks S;

[0025] A wastewater outlet channel L is provided on the opposite side of the water distribution channel D;

[0026] One end of the backwash water collection tank S is connected to the wastewater outlet channel L;

[0027] The wastewater outlet channel L is connected to the backwash wastewater outlet pipe J.

[0028] Furthermore, a water distribution pipe maintenance valve E1 is installed at both ends of the perforated water distribution pipe F.

[0029] Furthermore, a water temperature sensor X is installed in the filter tank.

[0030] Furthermore, a perforated surface flushing inlet pipe K is installed in the middle of the filter tank and connected to the backwash water pump.

[0031] Furthermore, sand collection pits M are respectively provided at both ends of the wastewater outlet channel L, and the bottom of the sand collection pits M is lower than that of the wastewater outlet channel L.

[0032] The beneficial effects of this invention are:

[0033] 1) The present invention sets a row of water distribution pipes on the surface of the filter bed, changing the traditional V-type filter bed's drainage method through the side grooves. The perforated water distribution pipe F forms a planar water distribution system on the filter bed surface, which effectively improves the uniformity of water distribution in the filter bed. This avoids the risk of impurities penetrating the filter layer and threatening water quality in the later operation of the filter bed near the V-groove area in the traditional V-type filter bed due to the shorter flow path and larger water volume filtered per unit time.

[0034] 2) The water and air distribution channel space of this invention undertakes the functions of backwash water and air distribution, eliminating the drainage area above the central drainage channel in the traditional V-shaped trough and replacing it with an effective filtration space. The backwash wastewater is handled by the drainage channels arranged on both sides, increasing the effective filtration area of ​​the filter bed.

[0035] 3) The present invention sets up a lifting weir plate on the outside of the drainage channel. By linking with a high-precision water temperature sensor, the height of the weir plate can be increased within a certain range, which effectively solves the problem of sand loss caused by the expansion rate of the filter bed due to the decrease in water temperature in winter; at the same time, a sand collection pit is set on one side of the water outlet channel to avoid further loss of filter media.

[0036] 4) The perforated water distribution pipe of the present invention is designed to be detachable. Inspection valves are provided at both ends of the perforated water distribution pipe. After running for a period of time, the perforated water distribution pipe can be removed and flushed with high-pressure water to avoid clogging of the water distribution hole.

[0037] 5) The present invention sets a perforated surface flushing inlet pipe in the center and connects it to the backwashing water pump. This transforms the traditional V-type filter’s surface cleaning driven by gravity pressure difference into surface flushing under the pressure of the water pump. The water pressure and flow velocity of the flushing water increase, which speeds up the flow of suspended pollutants and impurities to the drainage tanks on both sides during the backwashing process. This achieves the function of surface cleaning of the V-type filter while improving the backwashing effect. Attached Figure Description

[0038] Figure 1 This is the top plan view of the present invention;

[0039] Figure 2 This is a bottom plan view of the present invention;

[0040] Figure 3 This is section view 1-1;

[0041] Figure 4 This is section view 2-2;

[0042] Figure 5 This is a schematic diagram of a traditional V-type filter.

[0043] In the diagram: A—Inlet channel, B—Inlet gate, C—Pre-embedded water distribution steel pipe joint, D—Water distribution channel, E1—Water distribution pipe maintenance valve, F—Perforated water distribution pipe, G—Water distribution pipe horizontal support, H—Lifting weir plate, I—Filter inlet pipe, J—Backwash wastewater outlet pipe, K—Surface flushing perforated inlet pipe, E2—Surface flushing water pipe maintenance valve, L—Wastewater outlet channel, M—Sand collection pit, N—Backwash water and air distribution channel and collection channel, O—Filter backwash inlet pipe and filter... Rear outlet pipe, P1—backwash inlet water pipe control valve, P2—backwash inlet water pipe, Q1—filter outlet water pipe, Q2—filter outlet water control valve, Q3—filter outlet water seal well, Q4—filter outlet main pipe, R1—backwash air inlet control valve, R2—backwash air inlet pipe, S—backwash water collection tank, T—filter media layer, U—support layer, V—long-handled filter head, W1—backwash water distribution channel air inlet, W2—backwash water distribution channel water inlet, X—high-precision water temperature sensor. Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments.

[0045] This invention features a row of water distribution pipes on the surface of the filter bed, changing the traditional V-shaped filter bed's drainage method through side channels. It modifies the central drainage channel of the traditional V-shaped filter bed, with the bottom space handling backwash water and air distribution, eliminating the upper drainage area and converting it into an effective filtration space. Backwash wastewater is handled by drainage channels on both sides, thus increasing the effective filtration area of ​​the filter bed. A lifting weir plate is installed outside the drainage channel; linked to a high-precision water temperature sensor, the weir plate height can be increased within a certain range, effectively solving the problem of sand loss caused by filter bed expansion due to lower water temperature in winter. Simultaneously, a sand collection pit is set on one side of the outlet channel to prevent further filter media loss. The perforated water distribution pipes are detachable, with inspection valves at both ends. After a period of operation, the perforated water distribution pipes can be removed for high-pressure water flushing, preventing blockage of the distribution holes. A surface flushing perforated inlet pipe K is installed in the center, connected to the backwash water pump, which, during backwashing, enhances the backwashing effect while simultaneously improving the surface cleaning function of the V-shaped filter bed.

[0046] This invention provides a water treatment method based on a V-type filter, specifically:

[0047] During the filtration process, the filter bed effluent control valve Q2 is opened, and the backwash inlet control valve P1 is closed;

[0048] The filtered water is transported through the inlet pipe I of the filter tank, flows into the inlet channel A, passes through the inlet gate B, and flows into the distribution channel D; the filtered water enters the perforated distribution pipe F through the distribution channel D; after the filtered water enters the filter bed, it passes through the filter material layer T, the support layer U, and the long-handled filter head V and enters the backwash water and air distribution channel and the collection channel N of the filter tank.

[0049] The filtered water flows out through the backwash water and air distribution channel and the collection channel N of the filter tank, and then enters the filter tank outlet water seal well Q3 through the backwash water inlet pipe and the filtered water outlet pipe O and the filter tank outlet pipe Q1. Finally, it flows out through the filter tank outlet main pipe Q4 to complete the filtration process.

[0050] The backwashing process includes: backwashing air washing, backwashing water washing, and backwashing air-water combined washing. Surface washing accompanies the entire backwashing process.

[0051] During the backwashing process, the backwashing gas enters the filter bed through the backwashing air inlet pipe R2, the backwashing air inlet control valve R1, the backwashing water and air distribution channel and the water collection channel N, the backwashing water distribution channel air inlet W1, and the long-handled filter head V.

[0052] During the backwashing process, the backwash water enters the filter bed through the backwash inlet pipe P2, the backwash inlet pipe control valve P1, the filter tank backwash inlet pipe and the filtered outlet pipe O, the backwash water and air distribution channel and the water collection channel N, the backwash water distribution channel inlet W2, and the long-handled filter head V. During the backwashing air and water combined flushing process, the backwash air and water are distributed according to the above-mentioned pathways, and finally, the backwashing water wash is performed to complete the entire backwashing process.

[0053] Surface flushing water enters the filter bed through the surface flushing water pipe inspection valve E2 and the surface flushing perforated inlet pipe K. It is used to flush the dirt and impurities floating on the backwash to both sides of the filter bed, speeding up the rinsing process and helping to save water. Both backwashing wastewater and surface flushing water flow into the backwashing collection tank S through the lifting weir plate H, and then flow into the wastewater outlet channel L from the backwashing collection tank S, and finally flow out through the backwashing wastewater outlet pipe J.

[0054] According to the formula (1) for calculating the backwashing strength of quartz sand filter media proposed by Mintz and Schubert through experimental research:

[0055] Formula (1)

[0056] Where: q—backwash intensity, L / (m2·s)

[0057] d0—Diameter of a sphere with the same volume as the sand filter media particles, in cm;

[0058] μ—dynamic viscosity of water, Pa·s;

[0059] m0—Porosity of the filter media layer before expansion;

[0060] e—Filter bed expansion rate, also known as filter bed expansion degree, %

[0061] The dynamic viscosity of water is related to water temperature, as shown in formula (2):

[0062] Formula (2)

[0063] Where: μ—dynamic viscosity of water, Pa·s; T—temperature in °C;

[0064] The calculation method for filter layer expansion rate is as follows: (3)

[0065] Formula (3)

[0066] Where: L—thickness of the filter layer after expansion, in meters;

[0067] L0—Thickness of the filter media layer before expansion, in meters;

[0068] A liftable weir plate H is installed on the outside of the backwash water collection tank S. The liftable weir plate H is raised and lowered by a chain drive mechanism. The distance H1 between the top of the weir plate and the top of the filter material layer is related to the thickness L of the filter material layer after expansion: H1 > L.

[0069] As can be seen from the formula, when the water temperature is low in winter, the dynamic viscosity of the water increases. Under the original backwashing conditions, the expansion rate of the filter layer increases, which leads to an increase in the thickness of the filter layer after expansion, resulting in serious sand loss problems and causing trouble for the operation and maintenance of the filter. By linking the water temperature sensor X with the liftable weir plate H, the distance H1 between the top of the weir plate and the top of the filter layer is adjusted so that H1 > the thickness L of the expanded filter layer, which avoids sand loss and the loss of filter media, which would have an adverse effect on subsequent treatment units and increase operation and maintenance costs. If local sand loss occurs, the sand settles in the sand collection pit M due to the density difference and can be recycled later.

[0070] After running for a period of time, remove the maintenance valves E1 at both ends of the perforated water distribution pipe F, and use high-pressure water to flush the water distribution holes to prevent them from becoming clogged; remove the maintenance valves E2 at both ends of the surface flushing perforated water inlet pipe K, and use high-pressure water to flush the water distribution holes to prevent them from becoming clogged; introduce surface flushing water into the surface flushing perforated water inlet pipe K to perform surface flushing, thereby achieving the surface cleaning function of the traditional V-type filter while improving the backwashing effect.

[0071] like Figure 1-4 As shown, the V-shaped filter used in the water treatment method of the present invention includes a filter inlet pipe I, which is connected to the inlet channel A; an inlet gate B is provided between the inlet channel A and the distribution channel D.

[0072] A row of perforated water distribution pipes F is arranged along the width of the filter bed on one side of the water distribution channel D, and the perforated water distribution pipes F are connected to the water distribution channel D. Pre-embedded water distribution steel pipe joints C and water distribution pipe maintenance valves E1 are respectively installed at both ends of the perforated water distribution pipes F. The perforated water distribution pipes F form a surface water distribution system on the filter bed surface, which effectively improves the uniformity of water distribution in the filter bed and avoids the risk of impurities penetrating the filter layer and threatening water quality in the later operation of the filter bed near the V-shaped groove area in the traditional V-type filter bed, which has a shorter flow and a larger amount of water filtered per unit time.

[0073] A filter media layer T is installed below the water distribution perforated pipe F, and a support layer U and a long-handled filter head V are installed below the filter media layer T.

[0074] The bottom of the filter is equipped with a backwash water and air distribution channel and a water collection channel N; the backwash water and air distribution channel and the water collection channel N are connected to the filter backwash inlet pipe and the filtered water outlet pipe O; the ends of the filter backwash inlet pipe and the filtered water outlet pipe O are respectively connected to the filter outlet pipe Q1 and the backwash inlet pipe P2; the filter outlet pipe Q1 is connected to the filter outlet water seal well Q3; the filter outlet water seal well Q3 is connected to the filter outlet main pipe Q4; the filter outlet pipe Q1 is equipped with a filter outlet control valve Q2.

[0075] A backwash inlet water control valve P1 is installed on the backwash inlet water pipe P2 to control the on / off of the backwash inlet water; the backwash water distribution and air distribution channel and the water collection channel N are connected to the backwash air inlet pipe R2, and a backwash air inlet control valve R1 is installed on the backwash air inlet pipe R2 to control the on / off of the backwash air inlet; the bottom of the backwash water distribution and air distribution channel and the water collection channel N is provided with a backwash water distribution channel air inlet W1 and a backwash water distribution channel water inlet W2; backwash water collection tanks S are provided on both sides inside the filter tank, and a lifting weir plate H is provided on the outside of the backwash water collection tank S.

[0076] Wastewater outlet channel L is set on the opposite side of water distribution channel D; sand collection pits M are set at both ends of wastewater outlet channel L, with the bottom of sand collection pits M being lower than wastewater outlet channel L and 300mm deeper than the wastewater channel, as a secondary protection measure; one end of backwash collection tank S is connected to wastewater outlet channel L; wastewater outlet channel L is connected to backwash wastewater outlet pipe J; by optimizing the backwash wastewater outlet method, the space above the central drainage channel is replaced by backwash collection tank S, which solves the problem of reduced effective filtration area of ​​the filter, increases the effective filtration area, improves filtration capacity, and solves the contradiction between the newly built filter and the land area.

[0077] A water temperature sensor X is installed in the filter tank; a surface flushing perforated water inlet pipe K is installed in the middle of the filter tank and connected to the backwash water pump; and a water distribution pipe maintenance valve E1 is installed at both ends of the perforated water distribution pipe F.

[0078] The content of this invention is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solutions of this invention by reading this specification are covered by the claims of this invention.

Claims

1. A water treatment method based on a V-type filter, characterized in that: During the filtration process, the filter bed effluent control valve Q2 is opened, and the backwash inlet control valve P1 is closed; The filtered water is transported through the inlet pipe I of the filter tank, flows into the inlet channel A, passes through the inlet gate B, and flows into the distribution channel D; the filtered water enters the perforated distribution pipe F through the distribution channel D; after the filtered water enters the filter bed, it passes through the filter material layer T, the support layer U, and the long-handled filter head V and enters the backwash water and air distribution channel and the collection channel N of the filter tank. The filtered water flows out through the backwash water and air distribution channel and the collection channel N of the filter tank, and then enters the filter tank outlet water seal well Q3 through the backwash water inlet pipe and the filtered water outlet pipe O and the filter tank outlet pipe Q1. Finally, it flows out through the filter tank outlet main pipe Q4 to complete the filtration process. The backwashing process includes: backwashing air washing, backwashing water washing, and backwashing air-water combined washing. Surface washing accompanies the entire backwashing process. During the backwashing process, the backwashing gas enters the filter bed through the backwashing air inlet pipe R2, the backwashing air inlet control valve R1, the backwashing water and air distribution channel and the water collection channel N, the backwashing water distribution channel air inlet W1, and the long-handled filter head V. During the backwashing process, the backwash water enters the filter bed through the backwash inlet pipe P2, the backwash inlet pipe control valve P1, the filter tank backwash inlet pipe and the filtered outlet pipe O, the backwash water and air distribution channel and the water collection channel N, the backwash water distribution channel inlet W2, and the long-handled filter head V. During the backwashing air-water combined flushing process, the backwash air and water are distributed according to the above-mentioned pathways, and finally, the backwashing water washes to complete the entire backwashing process. The surface flushing water enters the filter bed through the surface flushing water pipe maintenance valve E2 and the surface flushing perforated inlet pipe K, and is used to flush the dirt and impurities floating on the backwash to both sides of the filter tank. Both backwash wastewater and surface flushing water flow into the backwash collection tank S through the lifting weir plate H, then flow into the wastewater outlet channel L from the backwash collection tank S, and finally flow out through the backwash wastewater outlet pipe J.

2. The water treatment method based on a V-type filter according to claim 1, characterized in that: When the water temperature is low in winter, the water temperature sensor X in the filter tank is linked with the liftable weir plate H to adjust the distance H1 between the top of the weir plate and the top of the filter media layer, so that H1 is greater than the thickness L of the filter media layer after expansion.

3. The water treatment method based on a V-type filter according to claim 2, characterized in that: During the backwashing process, if local sand leakage occurs, the sand will settle in the sand collection pit M.

4. The water treatment method based on a V-type filter according to claim 3, characterized in that: After running for a period of time, remove the maintenance valves E1 at both ends of the perforated water distribution pipe F, and use high-pressure water to flush the water distribution holes on the perforated water distribution pipe F.

5. The water treatment method based on a V-type filter according to claim 1, characterized in that: The water treatment method uses a V-shaped filter, which includes a filter inlet pipe I connected to an inlet channel A; an inlet gate B is installed between the inlet channel A and the distribution channel D. A row of perforated water distribution pipes F is arranged along the width of the filter tank on one side of the water distribution channel D. The perforated water distribution pipes F are connected to the water distribution channel D. A pre-embedded water distribution steel pipe joint C and a water distribution pipe maintenance valve E1 are respectively installed at both ends of the perforated water distribution pipes F. A filter media layer T is provided below the water distribution perforated pipe F, and a support layer U and a long-handled filter head V are provided below the filter media layer T. The bottom of the filter tank is equipped with a backwash water and air distribution channel and a water collection channel N; the backwash water and air distribution channel and the water collection channel N are connected to the filter tank backwash inlet pipe and the filtered water outlet pipe O; the ends of the filter tank backwash inlet pipe and the filtered water outlet pipe O are respectively connected to the filter tank outlet pipe Q1 and the backwash inlet pipe P2; the filter tank outlet pipe Q1 is connected to the filter tank outlet water seal well Q3; the filter tank outlet water seal well Q3 is connected to the filter tank outlet main pipe Q4; a filter tank outlet control valve Q2 is installed on the filter tank outlet pipe Q1. A backwash inlet control valve P1 is installed on the backwash inlet pipe P2 to control the on / off of the backwash inlet water. The backwash water and air distribution channel and the water collection channel N are simultaneously connected to the backwash air inlet pipe R2. The backwash air inlet pipe R2 is equipped with a backwash air inlet control valve R1 to control the backwash air inlet on and off. The bottom of the backwash water distribution and air distribution channel and the water collection channel N are provided with a backwash water distribution channel air inlet W1 and a backwash water distribution channel water inlet W2; Backwash collection tanks S are installed on both sides inside the filter tank, and a lifting weir plate H is installed on the outside of the backwash collection tanks S; A wastewater outlet channel L is provided on the opposite side of the water distribution channel D; One end of the backwash water collection tank S is connected to the wastewater outlet channel L; The wastewater outlet channel L is connected to the backwash wastewater outlet pipe J.

6. A water treatment method based on a V-type filter according to claim 5, characterized in that: The perforated water distribution pipe F is equipped with a water distribution pipe maintenance valve E1 at both ends.

7. A water treatment method based on a V-type filter according to claim 6, characterized in that: A water temperature sensor X is installed in the filter tank.

8. A water treatment method based on a V-type filter according to claim 7, characterized in that: A perforated surface flushing inlet pipe K is installed in the middle of the filter tank and connected to the backwash water pump.

9. A water treatment method based on a V-type filter according to claim 8, characterized in that: Sand collection pits M are respectively set at both ends of the wastewater outlet channel L, and the bottom of the sand collection pits M is lower than that of the wastewater outlet channel L.

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