High-precision active water treatment equipment and backwashing method

Abstract

The invention relates to the field of water treatment, in particular to high-precision active water treatment equipment and a backwashing method.The equipment comprises a main tank body, the main tank body is sequentially provided with an oil treatment area, a filtering area and a clear water area from top to bottom, the oil treatment area is provided with a water inlet pipe, and the clear water area is provided with a water outlet pipe; an oil removal unit for separating oil stains in raw water is arranged in the oil treatment area, a filter unit for filtering impurities in water is arranged in the filter area, the water outlet pipe is communicated with a backwashing unit, the filter area is communicated with a first backwashing drain pipe, and the water inlet pipe is communicated with a second backwashing drain pipe; an oil-water separation tank, a sedimentation tank and the like do not need to be additionally arranged, the cost is saved, meanwhile, by additionally arranging a first backwashing drainage pipe in the filtering area, the equipment can be subjected to two times of different backwashing through the backwashing unit, large particles gathered by filtered dirt in the filtering area and the oil removal area are washed away, self-cleaning of the whole equipment is achieved, and the service life of the equipment is prolonged. The filtering effect is ensured and the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and more particularly to a high-precision activated water treatment device and a backwashing method. Background Technology

[0002] Traditional water treatment equipment for biologically contaminated water typically uses flocculants, followed by sedimentation and filtration to remove particulate impurities. The filter media used are generally granular or fibrous materials such as quartz sand and anthracite. When the raw water contains oil, these filter media are easily contaminated by oil and microorganisms, causing clogging, compaction, and even wormholes, thus losing some of their filtration function. In circulating water treatment, after treating oily raw water, the filter media can easily lead to substandard turbidity and biological slime levels in the treated water. Especially for circulating water used in heat exchangers, substandard water treatment can reduce heat exchange efficiency or even cause blockage, seriously affecting the long-term safe operation of the production unit. Furthermore, oil-contaminated filter media cannot be cleaned by conventional backwashing, requiring additional high-intensity air washing and other auxiliary backwashing steps, which significantly reduces the filter media's lifespan. Therefore, there is an urgent need for a filtration device suitable for oil separation with a longer service life. Summary of the Invention

[0003] To address the above problems, this invention provides an easy-to-clean device with degreasing function and resistance to biofouling.

[0004] The technical solution of the present invention is as follows:

[0005] A high-precision activated water treatment device includes a main tank, which is provided with an oil treatment zone, a filtration zone, and a clean water zone from top to bottom. The oil treatment zone is provided with an inlet pipe, and the clean water zone is provided with an outlet pipe. The oil treatment zone is provided with an oil removal unit for separating oil from the raw water, and the filtration zone is provided with a filtration unit for filtering impurities from the water. The outlet pipe is connected to a backwashing unit, the filtration zone is connected to a first backwash drain pipe, and the inlet pipe is connected to a second backwash drain pipe.

[0006] In this solution, oil in the raw water is first removed in the oil treatment zone on the upper part of the main tank, which avoids oil contamination of the filter media of subsequent filtration units. This eliminates the need for additional oil-water separation tanks and sedimentation tanks, saving costs. Furthermore, because of the oil treatment zone, conventional backwashing methods with water inlet and outlet pipes cannot achieve the desired cleaning effect and can cause blockage and contamination in the oil treatment zone. This solution addresses this by installing a first backwash drain pipe in the filtration zone, allowing the equipment to undergo two different backwashing processes. This flushes away large particles of filter debris accumulated in the filtration and oil removal zones, achieving self-cleaning of the entire equipment, ensuring filtration efficiency, and extending the equipment's lifespan.

[0007] Preferably, the oil removal unit includes an oil droplet catcher disposed at the top of the oil removal zone. The oil droplet catcher includes a funnel-shaped oil suction port with an opening facing downwards. An oil quantity sensor is disposed at the oil suction port. The oil droplet catcher is connected to an oil storage tank through an oil discharge pipe. The oil droplet catcher can draw oil into the oil storage tank through negative pressure.

[0008] In this scheme, after the raw water enters the main tank, the oil layer that has accumulated on the upper surface of the main tank is drawn into the oil storage tank through the oil suction port by the principle that the density of oil is less than that of water, thus achieving oil-water separation.

[0009] Preferably, the oil removal unit further includes a first filter bed filled with hydrophilic and oleophobic aluminosilicate filter media. In this design, the first filter bed, relying on its own hydrophilic and oleophobic properties, allows the tiny oil droplets dispersed in the raw water to collide with each other and aggregate into larger oil droplets as they pass through the first filter bed. These larger oil droplets then move upwards under buoyancy, forming an oil layer above the main tank, which facilitates subsequent oil-water separation.

[0010] Preferably, the filtration unit includes a second filter bed filled with aluminosilicate modified filter media. Due to the aluminosilicate modified filter media, the second filter bed possesses both physical interception and adsorption functions, effectively improving filtration efficiency and rate.

[0011] Preferably, the oil treatment zone and the filtration zone, as well as the filtration zone and the clean water zone, are separated by perforated plates (the first filter bed and the second filter bed are respectively placed on two perforated plates).

[0012] Preferably, an umbrella-shaped water collector is provided above the filtration unit in the filtration zone, with the opening of the water collector facing upwards, and the water collector is connected to the first backwash drain pipe through the first water distribution pipe.

[0013] In this design, during the first backwash, backwash water enters from the bottom outlet pipe, flushing upwards the filter unit and dispersing the filter material on its surface, creating suspended solids in the water. When the water level rises above the collector, the water level will not continue to rise because the collector is connected to the first backwash drain pipe, and the backwash water will flow out of the collector. Furthermore, the umbrella-shaped collector, by increasing the inlet area, reduces the flow velocity of the water entering the drain pipe, minimizing local eddies and energy loss, and preventing turbulence that could hinder the discharge of suspended solids from the collector. Simultaneously, the smooth, curved umbrella-shaped structure reduces the accumulation or blockage of suspended solids at the inlet, further increasing the chance of suspended solids being drawn in with the water flow, thus improving backwash efficiency.

[0014] Preferably, the water inlet pipe extends into the center of the main tank through the second water distribution pipe and is equipped with an umbrella-shaped water distributor with its opening facing upwards.

[0015] In this design, the water distributor is designed in an umbrella shape, which allows the raw water entering through the inlet pipe to be evenly distributed into the main tank, ensuring effective oil-water separation. During the second backwash, the water distributor, like the water collector, can reduce the flow velocity of the water as it enters the drain pipe by increasing the inlet area. This reduces local eddies and energy loss, preventing turbulence that could affect the discharge of suspended solids from the water collector. Furthermore, the smooth, curved umbrella-shaped structure reduces the accumulation or blockage of suspended solids at the inlet, further increasing the chance of suspended solids being drawn in with the water flow and improving backwash efficiency.

[0016] Preferably, the inlet pipe is connected to a drain pipe via a drain valve, and a turbidity analyzer is installed on the drain pipe section.

[0017] In this scheme, a turbidity meter can be used to detect the turbidity of the backwash water discharged from the first or second backwash drain pipe in real time during the backwashing process. When the test is qualified, it means that the backwashing has met the standard.

[0018] Preferably, each pipeline is equipped with an independent automatic control valve, which is controlled by a controller located outside the main tank. The data collected by the turbidity analyzer and the oil content analyzer are transmitted to the controller.

[0019] In this solution, the controller can adjust the opening and closing of the corresponding automatic control valves based on the data detected by each monitoring component, thereby achieving automated water treatment.

[0020] To ensure the backwashing effect of water treatment equipment with oil removal function and effectively improve its service life, a backwashing method for a high-precision activated water treatment device is provided. Specifically, this method involves using the aforementioned high-precision activated water treatment device, including the following steps: Step 1: Open the valve of the first backwash drain pipe, allowing the backwash unit to input backwash water from the outlet pipe into the main tank, and then outputting the backwash water from the first backwash drain pipe. Step 2: Detect the turbidity of the backwash water output from the first backwash drain pipe. If the turbidity is within acceptable limits, stop the backwash unit from inputting backwash water and simultaneously close the valve of the first backwash drain pipe. Step 3: Open the valve of the second backwash drain pipe, allowing the backwash unit to input backwash water from the outlet pipe into the main tank, and then outputting the backwash water from the second backwash drain pipe along the inlet pipe. Step 4: Detect the turbidity of the backwash water output from the second backwash drain pipe. If the turbidity is within acceptable limits, stop the backwash unit from inputting backwash water and simultaneously close the valve of the second backwash drain pipe, completing the backwashing process.

[0021] This solution involves two backwashing processes. The first backwash cleans the filtration zone, and the second backwash cleans the oil treatment zone. The first backwash allows large particles of impurities accumulated on the second filter bed to be discharged directly from the first backwash drain pipe in the filtration zone, preventing them from adhering to the first filter bed in the oil treatment zone during the first backwash and exacerbating the blockage. After the second filter bed backwash is completed, the backwash water directly overflows the second filter bed during the second backwash process, discharging the large particles of impurities accumulated on the first filter bed from the second backwash drain pipe connected to the inlet pipe, thereby achieving backwashing of the entire equipment.

[0022] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0023] 1. In the water treatment process of this invention, the oil in the raw water is first removed in the oil treatment zone on the upper part of the main tank, which can avoid oil contamination of the filter media of the subsequent filtration unit. At the same time, there is no need to set up an additional oil-water separation tank, sedimentation tank, etc., thus saving costs.

[0024] 2. The backwashing mode of this application is achieved by additionally setting a first backwash drain pipe in the filtration zone, so that the equipment can perform two different backwashes through the backwashing unit, thereby ensuring that large particles of filter dirt accumulated in the filtration zone and oil removal zone can be flushed away, realizing self-cleaning of the entire equipment, ensuring filtration effect and improving the service life of the equipment. Attached Figure Description

[0025] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0026] In the attached diagram:

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a flowchart of the backwashing process of the present invention.

[0029] Explanation of markings in the diagram

[0030] 1-Main tank, 2-Oil treatment area, 3-Filtration area, 4-Clear water area, 5-Inlet pipe, 501-Inlet valve, 6-Outlet pipe, 601-Outlet valve, 7-First filter bed, 701-Oil droplet catcher, 702-Oil quantity sensor, 703-Oil storage tank, 8-Second filter bed, 9-Backwash unit, 901-Backwash valve, 10-First backwash drain pipe, 1001-First drain valve, 11-Second backwash drain pipe, 1101-Backwash drain valve, 1102-Second drain valve, 12-Perforated plate, 13-Water collector, 14-Water distributor, 15-Turbidity analyzer, 16-First water distribution pipe, 17-Second water distribution pipe, 18-Backwash pipe, 19-Oil drain pipe, 20-Controller.

[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of the present invention.

[0033] Example 1:

[0034] A high-precision activated water treatment device includes a main tank 1. The main tank 1 is provided with an oil treatment zone 2, a filtration zone 3, and a clean water zone 4 from top to bottom. The oil treatment zone 2 is provided with an inlet pipe 5, and the clean water zone 4 is provided with an outlet pipe 6. The oil treatment zone 2 is provided with an oil removal unit for separating oil from the raw water, the filtration zone 3 is provided with a filtration unit for filtering impurities in the water, the outlet pipe 6 is connected to a backwashing unit 9, the filtration zone 3 is connected to a first backwash drain pipe 10, and the inlet pipe 5 is connected to a second backwash drain pipe 11.

[0035] Specifically, such as Figure 1 As shown, in the oil treatment zone 2, the inlet pipe 5 extends into the center of the oil treatment zone 2 in the main tank 1 through the second water distribution pipe 17, and an umbrella-shaped water distributor 14 with its opening facing upwards is provided at the end of the second water distribution pipe 17. In this embodiment, the oil removal unit used includes an oil droplet catcher 701 above the water distributor 14 and a first filter bed 7 below the water distributor 14. The first filter bed 7 is filled with hydrophilic and oleophobic aluminosilicate filter media. The filter media uses amorphous aluminosilicate as a carrier, and after chemical activation and heat treatment and the addition of a catalyst, the aluminosilicate filter media becomes hydrophilic and oleophobic. In this embodiment, the first filter bed 7 relies on its own hydrophilic and oleophobic properties to allow the small oil droplets dispersed in the raw water to collide with each other when passing through the first filter bed 7, and then aggregate to form larger oil droplets, which move upwards under the action of buoyancy, forming an oil layer above the main tank 1, which facilitates the subsequent separation of oil and water.

[0036] The oil droplet catcher 701 includes a funnel-shaped oil suction port with an opening facing downwards and is located on the top of the main tank 1. An oil quantity sensor 702 is installed at the oil suction port. The oil droplet catcher 701 is connected to an oil storage tank 703 through an oil discharge pipe 19. The oil droplet catcher 701 can draw oil into the oil storage tank 703 through negative pressure.

[0037] In this embodiment, the raw water is fed into the tank through the inlet pipe 5 and evenly distributed into the tank by the water distributor 14. Due to the obstruction of the first filter bed 7, the amount of water passing through the first filter bed 7 is necessarily less than the amount of water fed into the main tank 1. The raw water initially accumulates in the oil treatment zone 2. Since oil is not soluble in water, large oil droplets will automatically float to the surface. When the tiny oil droplets mixed in the raw water encounter the first filter bed 7, the first filter bed 7's hydrophilic and oleophobic properties can displace the oil droplets, causing the dispersed tiny oil droplets in the water to collide with each other and then aggregate to form larger oil droplets. These larger oil droplets move upward under the action of buoyancy and eventually form an oil layer above the main tank 1. The oil droplet catcher 701 identifies the oil content at the top of the main tank 1 through the oil level sensor 702. When oil contamination is detected, the opening of the droplet catcher is controlled to open, and the oil on the upper layer of the raw water in the main tank 1 is sucked into the oil storage tank 703 for collection through negative pressure. Meanwhile, some larger particles of impurities are filtered out by the first filter bed 7, and the pre-filtered water enters the filtration zone 3 for complete filtration. The oil in the raw water is first removed in the oil treatment zone 2 on the upper layer of the main tank 1, which can prevent oil from contaminating the filter media of subsequent filtration units. There is no need to set up an additional oil-water separation tank, sedimentation tank, etc., saving costs. At the same time, because of the presence of the oil treatment zone 2, the conventional backwashing method of water inlet 6 and water outlet 5 cannot achieve the cleaning effect and will cause blockage and contamination of the oil treatment zone 2. In this embodiment, by additionally setting a first backwash drain pipe 10 in the filtration zone 3, the equipment can perform two different backwashes through the backwashing unit 9, flushing away the large particles of filter debris accumulated in the filtration zone 3 and the oil removal zone, realizing self-cleaning of the entire equipment, ensuring filtration effect and improving the service life of the equipment.

[0038] Furthermore, the oil treatment zone 2 and the filtration zone 3 are separated by a porous plate 12. The filtration unit in the filtration zone 3 includes a second filter bed 8, which is filled with aluminosilicate modified filter media. The aluminosilicate modified filter media uses amorphous aluminosilicate as a carrier, and after chemical activation and heat treatment, the surface of the filter media particles is permanently negatively charged. The structure of each filter media particle is modified, and the charge characteristics, particle size (between 0.1 and 150 mm), catalytic performance (i.e., the ability to undergo a catalytic reaction that converts water molecules and dissolved oxygen into free radicals), resistance to biofouling, and molecular sieve properties are controlled. In this embodiment, due to the aluminosilicate modified filter media, the second filter bed 8 possesses physical interception and adsorption functions, effectively improving the filtration effect and rate.

[0039] The main tank 1 is provided with a first backwash drain pipe 10 that connects to the filter zone 3. The first backwash drain pipe 10 is connected to a water collector 13 through a first water distribution pipe 16. The water collector 13 is an umbrella-shaped structure with the opening facing upwards and is located above the second rate bed.

[0040] Furthermore, a perforated plate 12 is also provided below the second filter bed 8. The perforated plate 12 separates the filtration zone 3 and the clear water zone 4. The water in the clear water zone 4 is water that can be directly used after being filtered by the filtration zone 3. It is output through the water outlet pipe 6 set at the bottom of the main tank 1.

[0041] In this embodiment, the specific treatment process for the raw water is as follows: the raw water is input from the inlet pipe 5 above the main tank 1, treated in the main tank 1, and then output from the outlet pipe 6 below. The raw water passes through the second distribution pipe 17 and is then evenly input from the distributor 14 into the oil treatment zone 2 in the main tank 1. The filtration flow rate in the main tank 1 is greater than 25 m / h. In the oil treatment zone 2, large oil droplets float to the surface, while small oil droplets agglomerate into large water droplets under the hydrophilic and oleophobic effect of the first filter bed 7, and float due to buoyancy, allowing the oil to accumulate at the top layer of the oil treatment zone 2. Simultaneously, the oil droplet trap 701 opens its opening after detecting that the oil content is greater than 0.05 mg / L, and extracts the oil from the top layer of the oil treatment zone 2 using its built-in negative pressure mechanism. When the oil level sensor 702 detects insufficient oil content, the opening of the oil droplet trap 701 automatically closes. In the oil treatment zone 2, the raw water, after passing through the first filter bed 7, is free of oil, and large particles larger than 20 μm are also intercepted by the first filter bed 7. Non-oily impurities with a particle size of 2-20 μm enter the filtration zone 3 along with the oil-free water. In the filtration zone 3, small particles of impurities aggregate into particles larger than 20 μm on the second green bed and are blocked and filtered by the second filter bed 8. The turbidity of the water passing through the second filter bed 8 is less than or equal to 2 NTU and enters the clear water zone 4 for collection. The water in the clear water zone 4 can be discharged from the main tank 1 for subsequent use.

[0042] Example 2:

[0043] To ensure that the main tank 1 can undergo two backwashes and to simplify the piping layout, such as Figure 1 As shown, the middle section of the inlet pipe 5 is connected to the first backwash drain pipe 10 and the second backwash drain pipe 11, and the second backwash drain pipe 11 is connected to the outside. The middle end of the outlet pipe 6 is also connected to the backwash pipe 18, and backwash water is input through the backwash unit 9 in the backwash pipe 18. The backwash unit 9 can be a pump device connected to a clean water source. Of course, the backwash unit 9 uses clean water or tap water as the backwash water source.

[0044] It should be noted that each pipe section is equipped with a water valve, preferably an automatic control valve that can automatically control opening and closing to achieve automatic operation of the equipment. The automatic control valve can be controlled by the controller 20. Specifically, the inlet end of the inlet pipe 5 is equipped with an inlet valve 501; a backwash drain valve 1101 is installed between the second water distribution pipe 17 and the second backwash drain pipe 11; a first drain valve 1001 is installed on the first backwash drain pipe 10; a second drain valve 1102 is installed at the outlet of the second backwash drain pipe 11; and a backwash valve 901 is installed in the backwash unit 9.

[0045] The controller 20 is located outside the main tank 1. Specifically, it can be a hydraulic automatic control system, a PLC controller 20, or a DCS controller 20. A turbidity analyzer 15 is installed at the outlet of the second backwash drain pipe 11. The turbidity analyzer 15 is closer to the opening of the second backwash drain pipe 11 than the second drain valve 1102, ensuring that the turbidity analyzer 15 can only detect the water source when the second drain valve 1102 is open. The turbidity analyzer 15 also transmits the detected turbidity information to the controller 20 to determine whether the backwash meets the standards. Data collected by the oil analyzer is also transmitted to the controller 20. To achieve automatic backwashing, pressure sensors can be installed in the filtration zone 3, above and below the second filter bed 8. These pressure sensors transmit water pressure data to the controller 20, which detects the pressure difference between the two sensors. During filtration, as more pollutants are intercepted by the second filter bed 8 in the filtration zone 3, the filtration resistance increases, thus increasing the pressure difference. When the pressure difference reaches a certain value, the controller 20 stops the filtration and initiates a backwashing operation. During filtration and backwashing, the controller 20 can adjust the opening and closing of the corresponding automatic control valves based on the data detected by each monitoring component, thereby achieving automated water treatment.

[0046] This embodiment provides a backwashing method for a high-precision activated water treatment device, such as... Figure 2 As shown, specifically:

[0047] Step 1: First, close the inlet valve 501, backwash drain valve 1101 and outlet valve 601, and open the first drain valve 1001 and the second drain valve 1102. Then, open the backwash valve 901 to flush backwash water into the backwash pipe 18 through the backwash unit 9.

[0048] Backwash water enters the main tank 1 from the outlet pipe 6 in reverse. During this process, the backwash water passes through the clean water zone 4 and the perforated plate 12 in sequence and enters the filtration zone 3 to rinse the second filter bed 8 from bottom to top. The water flow passes through the second filter bed 8, dispersing the filter material deposited on the upper surface of the second filter bed 8, allowing the filter material to form a suspended state in the water and rise with the water. When the liquid level of the backwash water is higher than the opening of the water collector 13, the backwash water flows directly from the opening of the water collector 13 into the first water distribution pipe 16, and then from the first backwash drain pipe 10 into the inlet pipe 5. Since the inlet valve 501 and the backwash drain valve 1101 are both in the closed state, the backwash water containing the filter material is finally output to the outside from the second backwash drain pipe 11.

[0049] Step 2: The turbidity analyzer 15 at the outlet of the second backwash drain pipe 11 performs water quality testing. The turbidity analyzer 15 transmits the turbidity data to the controller 20. When the turbidity is less than 2 NTU, it indicates that the backwash is qualified. The controller 20 controls and closes the backwash valve 901, so that the backwash unit 9 stops inputting backwash water. After the backwash water stops, the first drain valve 1001 is closed, and the first backwash is completed.

[0050] Step 3: Open the backwash drain valve 1101, then open the backwash valve 901, allowing the backwash unit 9 to input backwash water from the outlet pipe 6 into the main tank. The backwash water flows back into the main tank 1 from the outlet pipe 6. During this process, the backwash water passes through the clean water zone 4 and the perforated plate 12 sequentially into the filtration zone 3. The backwash water continues to pass through the upper perforated plate 12 and enters the oil treatment zone 2, rinsing the first filter bed 7 from bottom to top, removing the filter material deposited on the upper surface of the first filter bed 7. The small, uncollected oil droplets remaining on the filter bed and the small amount of oil stains adhering to the inner wall of the main tank 1 are dispersed and allowed to flow upward with the backwash water. When the liquid level of the backwash water is higher than the opening of the water distributor 14, the backwash water flows directly from the opening of the water distributor 14 into the second water distribution pipe 17 and into the inlet pipe 5. Since the inlet valve 501 and the first drain valve 1001 are both closed, the backwash water containing the filtered material is finally output to the outside through the second backwash drain pipe 11.

[0051] Step 4: The turbidity analyzer 15 at the outlet of the second backwash drain pipe 11 performs water quality testing. If the turbidity is qualified, the backwash unit 9 stops input, and at the same time, the second drain valve 1102 and the backwash valve 901 are closed, and the inlet valve 501 and the outlet valve 601 are opened to complete the second backwash.

[0052] In this scheme, backwashing is performed twice. The first backwash cleans the filter zone 3, and the second backwash cleans the oil treatment zone 2. The first backwash allows large particles of impurities accumulated on the second filter bed 8 to be discharged directly from the first backwash drain pipe 10 of the filter zone 3, preventing them from adhering to the first filter bed 7 in the oil treatment zone 2 during the first backwash and aggravating the blockage of the first filter bed 7. After the second backwash is completed, the backwash water directly overflows the second filter bed 8 during the second backwash process, discharging the large particles of impurities accumulated on the first filter bed 7 from the second backwash drain pipe 11 connected to the water inlet pipe 5, thereby achieving backwashing of the entire equipment.

[0053] It should be noted that the equipment used in this embodiment is the equipment disclosed in Embodiment 1. In this embodiment, the water distributor 14 is set in an umbrella shape, which can make the raw water entering from the water inlet pipe 5 evenly distributed in the main tank 1, ensuring the oil-water separation effect. At the same time, during the second backwash, the water distributor 14 increases the inlet area, which reduces the flow velocity of the water when entering the drain pipe, reduces local eddies and energy loss, and avoids the generation of turbulence that would affect the discharge of suspended solids from the water collector 13. At the same time, the umbrella-shaped smooth transition curved surface structure can reduce the accumulation or blockage of suspended solids at the inlet, and further increase the chance of suspended solids being sucked in with the water flow, thus improving the backwash efficiency.

[0054] The umbrella-shaped water collector 13 and water distributor 14 have similar functions in the reverse process. By increasing the inlet area, the flow velocity of the water is reduced when it enters the drain pipe, reducing local eddies and energy loss, and avoiding the generation of turbulence that would affect the discharge of suspended solids from the water collector 13. At the same time, the umbrella-shaped smooth transition curved surface structure can reduce the accumulation or blockage of suspended solids at the inlet, and further increase the chance of suspended solids being sucked in with the water flow, thus improving the backwashing efficiency.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high-precision activated water treatment device, characterized in that, The system includes a main tank, which is provided with an oil treatment zone, a filtration zone, and a clean water zone from top to bottom. The oil treatment zone is equipped with an inlet pipe, and the clean water zone is equipped with an outlet pipe. The oil treatment zone is equipped with an oil removal unit for separating oil from the raw water, and the filtration zone is equipped with a filtration unit for filtering impurities from the water. The outlet pipe is connected to a backwashing unit, the filtration zone is connected to a first backwash drain pipe, and the inlet pipe is connected to a second backwash drain pipe.

2. The high-precision activated water treatment equipment according to claim 1, characterized in that, The oil removal unit includes an oil droplet catcher located at the top of the oil removal zone. The oil droplet catcher includes a funnel-shaped oil suction port with an opening facing downwards. An oil volume sensor is installed at the oil suction port. The oil droplet catcher is connected to an oil storage tank through an oil discharge pipe. The oil droplet catcher can draw oil into the oil storage tank through negative pressure.

3. The high-precision activated water treatment equipment according to claim 1, characterized in that, The oil removal unit also includes a first filter bed, which is filled with hydrophilic and oleophobic aluminosilicate filter media.

4. The high-precision activated water treatment equipment according to claim 2, characterized in that, The filtration unit includes a second filter bed filled with aluminosilicate modified filter media.

5. The high-precision activated water treatment equipment according to claim 4, characterized in that, The oil treatment zone and the filtration zone, as well as the filtration zone and the clean water zone, are separated by perforated plates.

6. A high-precision activated water treatment device according to claim 4, characterized in that, An umbrella-shaped water collector is provided above the filtration unit in the filtration zone. The opening of the water collector faces upward, and the water collector is connected to the first backwash drain pipe through the first water distribution pipe.

7. The high-precision activated water treatment equipment according to claim 4, characterized in that, The water inlet pipe extends into the center of the main tank through the second water distribution pipe and is equipped with an umbrella-shaped water distributor with its opening facing upwards.

8. The high-precision activated water treatment equipment according to claim 2, characterized in that, The inlet pipe is connected to a second backwash drain pipe via a drain valve, and a turbidity analyzer is installed at the outlet of the second backwash drain pipe.

9. A high-precision activated water treatment device according to claim 8, characterized in that, Each pipeline is equipped with an independent automatic control valve, which is controlled by a controller located outside the main tank. The data collected by the turbidity analyzer and the oil content analyzer are transmitted to the controller.

10. A backwashing method for a high-precision activated water treatment device, using the high-precision activated water treatment device according to any one of claims 1 to 9, characterized in that, include Step 1: Open the valve of the first backwash drain pipe to allow the backwash unit to input backwash water from the outlet pipe into the main tank, and allow the backwash water to output from the first backwash drain pipe; Step 2: Detect the turbidity of the backwash water output from the first backwash drain pipe. If the turbidity is within acceptable limits, stop the backwash unit from inputting water and close the valve of the first backwash drain pipe. Step 3: Open the valve of the second backwash drain pipe to allow the backwash unit to input backwash water into the main tank from the outlet pipe, and allow the backwash water to output from the second backwash drain pipe along the inlet pipe; Step 4: Detect the turbidity of the backwash water output from the second backwash drain pipe. If the turbidity is within acceptable limits, stop the backwash unit from inputting water and close the valve of the second backwash drain pipe to complete the backwash.

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