Fine backwashing system and method for fiber filter

Abstract

The invention discloses a fiber filter refined backwashing system and method. The system comprises a backwashing fan, a fiber filter, a water producing tank, a backwashing water pump, a water producing tank, a filter water inlet pipeline and a water drainage pipeline, an outlet of the backwashing fan is communicated with a backwashing air inlet of the fiber filter, an outlet of the water producing box is communicated with a backwashing water inlet of the fiber filter through a backwashing water pump, and a water producing outlet of the fiber filter is communicated with an inlet of the water producing box through a water producing door and a water producing turbidimeter. An outlet of the filter water inlet pipeline is communicated with a water inlet of the fiber filter through a water inlet door, a backwashing water outlet of the fiber filter is communicated with the water drainage pipeline through a backwashing water drainage door and a backwashing water drainage turbidimeter, and an inlet and outlet water pressure difference transmitter is arranged between the water inlet of the fiber filter and the produced water outlet. The system and the method can improve the operation effect of the fiber filter and reduce the operation cost of the fiber filter.

Description

Technical Field

[0001] The invention belongs to the field of water treatment and relates to a fiber filter fine backwashing system and method. Background Art

[0002] Backwashing is one of the two basic operations of filters that is equally important as filtration. It is an important condition to ensure the long-term stable operation of the filter and maintain a good filtration effect. Looking at the development process of deep filtration technology, the impact of backwashing performance on the overall performance of deep filtration equipment, the promotion of deep filtration equipment and the development of deep filtration technology play a very important role. One of the characteristics of fiber filter fiber filter media that is different from traditional filter media is the compressibility of the fiber filter bed. At the end of filtration, the fiber bed layer of the fiber filter that has intercepted a large amount of mud is in a compacted state, while the fluffy and stretched fiber filter media and the full opening of the internal pores are the prerequisites for ensuring a good backwashing effect. The direct effect of backwashing is to restore the filtration capacity of the fiber filter media to ensure the quality of the filtered water and the filtration cycle thereafter. At the same time, reducing the amount of backwashing water used in the backwashing cycle and reducing the self-use water rate of the fiber filter are also of great significance for achieving water saving and emission reduction and reducing operating costs. In the actual use of existing fiber filter equipment, the filter backwashing is often carried out after the filtration cycle is artificially set for a certain time, and the filtration effect and self-use water rate are difficult to guarantee. Therefore, developing a fiber filter fine backwashing system and method is crucial to improving the operating performance of the fiber filter and reducing operating costs. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a fiber filter fine backwashing system and method, which can improve the operating effect of the fiber filter and reduce the operating cost of the fiber filter.

[0004] To achieve the above object, the present invention discloses a fiber filter fine backwashing system, including a backwashing fan, a fiber filter, a water production tank, a backwashing water pump, a water production tank, a filter water inlet pipe and a drainage pipe;

[0005] The outlet of the backwash fan is connected to the backwash air inlet of the fiber filter, the outlet of the water production tank is connected to the backwash water inlet of the fiber filter via the backwash water pump, the water production outlet of the fiber filter is connected to the inlet of the water production tank via the water production gate and the water production turbidity meter, the outlet of the filter water inlet pipe is connected to the water inlet of the fiber filter via the water inlet gate, the backwash water outlet of the fiber filter is connected to the drainage pipe via the backwash drainage gate and the backwash drainage turbidity meter, and an inlet and outlet water pressure difference transmitter is arranged between the water inlet and the water production outlet of the fiber filter.

[0006] Furthermore, the outlet of the backwash fan is connected to the backwash air inlet of the fiber filter through the backwash air inlet valve.

[0007] Furthermore, the outlet of the water production tank is connected to the backwash water inlet of the fiber filter through the backwash water pump and the backwash water inlet gate.

[0008] Furthermore, the drainage pipe is connected to a ditch.

[0009] The invention discloses a fiber filter fine backwashing method, comprising the following steps:

[0010] The turbidity of the water produced by the fiber filter is measured by a water turbidity meter. 1 , the turbidity N of the backwash drainage of the fiber filter is measured by the backwash drainage turbidity meter 2 , the water pressure difference ΔP between the water inlet of the fiber filter and the water outlet of the fiber filter is detected by the inlet and outlet water pressure difference transmitter;

[0011] Set the preset turbidity threshold N 1 `and water pressure difference threshold ΔP`;

[0012] When N 1 ≥N 1 `, ΔP<ΔP` or N 1 <N 1 `, ΔP ≥ ΔP`, the fiber filter backwash prompt is carried out, and the fiber filter continues to maintain the operating state. Within the continuous operation time Δt of the fiber filter, when the turbidity of the water produced by the fiber filter N 1 The inlet and outlet pressure difference ΔP has not dropped to the turbidity threshold N 1 ` and the water pressure difference threshold ΔP`, the filter backwash procedure is executed; when the turbidity of the fiber filter water N 1 The inlet and outlet pressure difference ΔP both drop to the turbidity threshold N 1 ` and the water pressure difference threshold ΔP`, the fiber filter backwash prompt is cancelled;

[0013] When N 1 ≥N 1 `, ΔP ≥ ΔP`, the fiber filter backwash procedure is executed immediately.

[0014] Furthermore, when the fiber filter backwashing program is started, the fiber filter is backwashed, wherein the fiber filter 1 is backwashed by a combination of single water combing + air washing and scrubbing + air and water washing.

[0015] Furthermore, during single water combing, only the backwash water pump is started to allow the fiber filter material to fully stretch under the combing action of the backwash water.

[0016] Furthermore, during air washing and scrubbing, the backwash water pump is stopped and only the backwash fan is started, so that the fiber filter material can fully peel off the trapped pollutants under the action of the backwash air.

[0017] Furthermore, when air and water are washed simultaneously, the backwash water pump and the backwash fan are started at the same time, so that the pollutants trapped on the fiber filter material are taken out of the filter layer under the stripping and flushing action of air and water.

[0018] Furthermore, when N 2 ≤(1+10%)N 1 When the air and water washing stops.

[0019] The further improvement of the present invention is:

[0020] The present invention has the following beneficial effects:

[0021] During specific operation, the fiber filter fine backwashing system and method described in the present invention monitors the turbidity of the water produced by the fiber filter and the difference in inlet and outlet water pressures in real time to determine the backwashing demand of the filter in real time. During backwashing, the "single water combing + air washing and scrubbing + air and water washing" method is adopted. At the same time, the turbidity of the backwashing drainage is monitored in real time as a backwashing stop condition, thereby achieving efficient operation of the fiber filter, greatly reducing the self-use water rate of the equipment, improving the operation effect of the fiber filter, and reducing the operation cost of the fiber filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural diagram of the present invention.

[0024] Among them, 1 is a fiber filter, 2 is a water production tank, 3 is a backwash water pump, 4 is a backwash fan, 5 is a water production turbidity meter, 6 is an inlet and outlet water pressure differential transmitter, 7 is a backwash drainage turbidity meter, 8 is a water inlet gate, 9 is a water production gate, 10 is a backwash water inlet gate, 11 is a backwash air inlet gate, and 12 is a backwash drainage gate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0029] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0030] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0033] Embodiment 1

[0034] refer to Figure 1 The fiber filter fine backwashing system of the present invention comprises a fiber filter 1, a water production tank 2, a backwashing water pump 3, a backwashing fan 4, a water production turbidity meter 5, an inlet and outlet water pressure differential transmitter 6, a backwashing drainage turbidity meter 7, a water inlet gate 8, a water production gate 9, a backwashing water inlet gate 10, a backwashing air inlet gate 11 and a backwashing drainage gate 12;

[0035] The outlet of the backwash fan 4 is connected to the backwash air inlet of the fiber filter 1 through the backwash air inlet gate 11, the outlet of the water production tank 2 is connected to the backwash water inlet of the fiber filter 1 through the backwash water pump 3 and the backwash water inlet gate 10, the water production outlet of the fiber filter 1 is connected to the inlet of the water production tank 2 through the water production gate 9 and the water production turbidity meter 5, the outlet of the filter water inlet pipe is connected to the water inlet of the fiber filter 1 through the water inlet gate 8, the backwash water outlet of the fiber filter 1 is connected to the drainage pipe through the backwash drainage gate 12 and the backwash drainage turbidity meter 7, the drainage pipe is connected to the ditch, and an inlet and outlet water pressure difference transmitter 6 is arranged between the water inlet and the water production outlet of the fiber filter 1.

[0036] Embodiment 2

[0037] refer to Figure 1 The fiber filter fine backwashing method of the present invention comprises the following steps:

[0038] The turbidity N of the water produced by the fiber filter 1 is measured by the water turbidity meter 5 1 , the turbidity of the backwash drainage of the fiber filter 1 is detected by the backwash drainage turbidity meter 7; the water pressure difference ΔP between the water inlet of the fiber filter 1 and the water outlet of the fiber filter 1 is detected by the inlet and outlet water pressure difference transmitter 6;

[0039] Set the preset turbidity threshold N 1 `and water pressure difference threshold ΔP`;

[0040] When N 1 ≥N 1 `, ΔP<ΔP` or N 1 <N 1`, ΔP ≥ ΔP`, the fiber filter 1 is backwashed and the fiber filter 1 is kept in operation. During the continuous operation time Δt of the fiber filter 1, when the turbidity N of the produced water of the fiber filter 1 is 1 The inlet and outlet pressure difference ΔP has not dropped to the turbidity threshold N 1 ` and the water pressure difference threshold ΔP`, the filter backwashing procedure is executed; when the turbidity of the produced water of the fiber filter 1 is N 1 The inlet and outlet pressure difference ΔP both drop to the turbidity threshold N 1 ` and the water pressure difference threshold value ΔP`, the backwash prompt of fiber filter 1 is cancelled.

[0041] When N 1 ≥N 1 `, ΔP ≥ ΔP`, the backwash procedure of fiber filter 1 is immediately executed.

[0042] When the backwashing procedure of the fiber filter 1 is started, the fiber filter 1 is backwashed, wherein the backwashing method adopts a combination of "single water combing + air washing and scrubbing + air and water washing" to backwash the fiber filter 1.

[0043] During single water combing, only the backwash water pump 3 is started to allow the fiber filter material to fully stretch under the combing action of the backwash water to obtain a good backwashing effect. The single water combing duration is t 1 , in general, t 1 For 3-5min.

[0044] During air washing and scrubbing, the backwash water pump 3 is stopped and only the backwash fan 4 is started, so that the fiber filter material can fully remove the trapped pollutants under the action of the backwash air. The duration of air washing and scrubbing is t 2 , in general, t 2 For 3-5min.

[0045] When air-water washing is performed simultaneously, the backwash water pump 3 and the backwash fan 4 are started simultaneously, so that the pollutants trapped on the fiber filter material are taken out of the filter layer under the peeling and flushing action of air and water. The duration of air-water washing is t 3 , t 3 According to the backwash drainage turbidity N of the fiber filter 1 2 The turbidity of the produced water with the fiber filter 1 is N 1 The comparison situation is determined.

[0046] The water washing intensity of the fiber filter 1 is generally 10-30L / m 2 ·s, the air washing intensity of the fiber filter 1 is generally 50-70L / m 2 ·s.

[0047] During the backwash process, the turbidity N of the backwash drainage of the fiber filter 1 is 2Real-time monitoring and N 2 The turbidity of the produced water with the fiber filter 1 is N 1 Perform real-time comparison.

[0048] When N 2 ≤(1+10%)N 1 When the gas-water washing stops, the backwashing time T = t 1 +t 2 +t 3 .

[0049] It should be noted that the present invention monitors the turbidity of the water produced by the fiber filter 1 and the difference in the water pressure at the inlet and outlet in real time, and judges the filter backwashing demand in real time. During backwashing, the "single water combing + air washing scrubbing + air and water washing" method is adopted, and the turbidity of the backwashing drainage is monitored in real time as the backwashing stop condition. Through the above measures, the present invention realizes the refined management of the fiber filter backwashing system, so as to realize the efficient operation of the fiber filter 1 and greatly reduce the self-use water rate of the equipment.

[0050] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0051] Embodiment 3

[0052] A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the fiber filter fine backwashing method are implemented, for example, including: detecting the turbidity N of the water produced by the fiber filter 1 by a water turbidity meter 5; 1 , the turbidity of the backwash drainage of the fiber filter 1 is detected by the backwash drainage turbidity meter 7; the water pressure difference ΔP between the water inlet of the fiber filter 1 and the water outlet of the fiber filter 1 is detected by the inlet and outlet water pressure difference transmitter 6; the preset turbidity threshold N is set 1 ` and water pressure difference threshold ΔP`; when N 1 ≥N 1 `, ΔP<ΔP` or N 1 <N 1 `, ΔP ≥ ΔP`, the fiber filter 1 is backwashed and the fiber filter 1 is kept in operation. During the continuous operation time Δt of the fiber filter 1, when the turbidity N of the produced water of the fiber filter 1 is 1 The inlet and outlet pressure difference ΔP has not dropped to the turbidity threshold N 1` and the water pressure difference threshold ΔP`, the filter backwashing procedure is executed; when the turbidity of the produced water of the fiber filter 1 is N 1 The inlet and outlet pressure difference ΔP both drop to the turbidity threshold N 1 ` and the water pressure difference threshold value ΔP`, the backwash prompt of the fiber filter 1 is cancelled. Wherein, the memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc.; the processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus can be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operating instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0053] Embodiment 4

[0054] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the fiber filter fine backwashing method are implemented, for example, including: detecting the turbidity N of the water produced by the fiber filter 1 by a water turbidity meter 5 1 , the turbidity of the backwash drainage of the fiber filter 1 is detected by the backwash drainage turbidity meter 7; the water pressure difference ΔP between the water inlet of the fiber filter 1 and the water outlet of the fiber filter 1 is detected by the inlet and outlet water pressure difference transmitter 6; the preset turbidity threshold N is set 1 ` and water pressure difference threshold ΔP`; when N 1 ≥N 1 `, ΔP<ΔP` or N 1 <N 1 `, ΔP ≥ ΔP`, the fiber filter 1 is backwashed and the fiber filter 1 is kept in operation. During the continuous operation time Δt of the fiber filter 1, when the turbidity N of the produced water of the fiber filter 1 is 1 The inlet and outlet pressure difference ΔP has not dropped to the turbidity threshold N 1 ` and the water pressure difference threshold ΔP`, the filter backwashing procedure is executed; when the turbidity of the produced water of the fiber filter 1 is N 1 The inlet and outlet pressure difference ΔP both drop to the turbidity threshold N 1 ` and the water pressure difference threshold value ΔP`, the backwash prompt of the fiber filter 1 is cancelled. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0055] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0056] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0057] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0059] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0060] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A fiber filter fine backwashing system, characterized in that: It includes a backwash fan (4), a fiber filter (1), a product water tank (2), a backwash water pump (3), a product water tank (2), a filter inlet pipe and a drain pipe; The outlet of the backwash fan (4) is communicated with the backwash air inlet of the fiber filter (1). The outlet of the product water tank (2) is communicated with the backwash water inlet of the fiber filter (1) via the backwash water pump (3). The product water outlet of the fiber filter (1) is communicated with the inlet of the product water tank (2) via a product water valve (9) and a product water turbidity meter (5). The outlet of the filter inlet pipe is communicated with the inlet of the fiber filter (1) via an inlet water valve (8). The backwash water outlet of the fiber filter (1) is communicated with the drain pipe via a backwash drain valve (12) and a backwash drain turbidity meter (7). A differential pressure transmitter (6) for inlet and outlet water pressure is arranged between the inlet of the fiber filter (1) and the product water outlet.

2. The fiber filter fine backwashing system according to claim 1 is characterized in that: The outlet of the backwash fan (4) is communicated with the backwash air inlet of the fiber filter (1) via a backwash air inlet valve (11).

3. The fiber filter fine backwashing system according to claim 1, characterized in that: The outlet of the product water tank (2) is communicated with the backwash water inlet of the fiber filter (1) via the backwash water pump (3) and a backwash inlet water valve (10).

4. The fiber filter fine backwashing system according to claim 1, characterized in that: The drain pipe is communicated with a地沟 (地沟 can be directly translated as "地沟" if it's a specific local term, or it can be translated as "地沟 (a local drainage channel)" for better understanding. Here I keep it as "地沟" as per the instruction).

5. A fiber filter fine backwashing method, characterized in that: Based on the fiber filter fine backwash system described in claim 1, it includes the following steps: Detect the turbidity N1 of the product water of the fiber filter (1) through the product water turbidity meter (5), detect the turbidity N2 of the backwash drain water of the fiber filter (1) through the backwash drain turbidity meter (7), and detect the water pressure difference ΔP between the inlet of the fiber filter (1) and the product water outlet of the fiber filter (1) through the differential pressure transmitter (6) for inlet and outlet water pressure; Set a preset turbidity threshold N1` and a water pressure difference threshold ΔP`; When N1≥N1` and ΔP<ΔP` or N1<N1` and ΔP≥ΔP`, a backwash prompt for the fiber filter (1) is given. The fiber filter (1) continues to maintain its operating state. During the continuous operating time Δt of the fiber filter (1), when both the product water turbidity N1 and the inlet and outlet water pressure difference ΔP of the fiber filter (1) do not drop below the turbidity threshold N1` and the water pressure difference threshold ΔP`, the filter backwash program is executed; when both the product water turbidity N1 and the inlet and outlet water pressure difference ΔP of the fiber filter (1) drop below the turbidity threshold N1` and the water pressure difference threshold ΔP`, the backwash prompt for the fiber filter (1) is cancelled; When N1≥N1` and ΔP≥ΔP`, the backwash program of the fiber filter (1) is immediately executed.

6. The fiber filter fine backwashing method according to claim 5, characterized in that: When the backwash program of the fiber filter (1) is started, the fiber filter (1) is backwashed. Among them, the fiber filter (1) is backwashed by a combined method of single - water combing + air scrubbing + air - water co - washing.

7. The fiber filter fine backwashing method according to claim 6, characterized in that: During single - water combing, only the backwash water pump (3) is started to make the fiber filter media fully stretch under the action of the backwash water combing.

8. The fiber filter fine backwashing method according to claim 6, characterized in that: During air scrubbing, the backwash water pump (3) is stopped and only the backwash fan (4) is started to make the fiber filter media fully strip the intercepted pollutants under the action of the backwash air.

9. The fiber filter fine backwashing method according to claim 6, characterized in that: During air - water co - washing, both the backwash water pump (3) and the backwash fan (4) are started to make the pollutants intercepted on the fiber filter media be carried out of the filter layer under the stripping and scouring action of air and water.

10. The fiber filter fine backwashing method according to claim 6, characterized in that: When N2≤(1+10%)N1, stop gas-water washing.

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