Bimodal gas washing and water level interlocking intelligent backwashing system of multi-medium filter

Abstract

The utility model discloses a bimodal gas washing and water level interlocking intelligent backwashing system of a multi-medium filter. The bimodal gas washing and water level interlocking intelligent backwashing system comprises a gas washing unit; the water backwashing unit comprises a backwashing pump, a first backwashing pipe, a second backwashing pipe and a third backwashing pipe; one end of the first backwashing pipe is connected to the backwashing pump, and the other end of the first backwashing pipe is connected to a water outlet in the tank bottom of the multi-medium filter; one end of the second backwashing pipe is connected with a first water outlet formed in the tank top of the multi-medium filter, and the other end of the second backwashing pipe is connected with the wastewater pool; one end of the third backwashing pipe is connected with a second water outlet formed in the side edge of the multi-medium filter, and the other end of the third backwashing pipe is connected with the wastewater pool; the positive flushing unit comprises a water inlet pump, a water inlet pipe and a water outlet pipe; wherein one end of the water inlet pipe is connected with the water inlet pump, and the other end of the water inlet pipe is connected with a water inlet at the top of the multi-medium filter tank; one end of the water outlet pipe is connected with a water outlet of the multi-medium filter tank bottom, and the other end of the water outlet pipe is connected to the filtering water tank.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment equipment technical field, specifically applicable to industrial circulating water treatment, municipal water supply and wastewater advanced treatment field, relate to a multimedium filter's bimodal gas washing and water level interlocking intelligent backwash system. BACKGROUND

[0002] The backwash of the existing multimedium filter mainly includes the following parts: 1, single water backwash: this is a more traditional backwash mode, through the water flow reverse through filter layer, make filter layer swell, suspended, with the shear force of water flow and the collision friction force of particle clean filter layer, make the dirt in filter layer separate and with backwash water discharge. General backwash water quantity is 2.5 to 4 times of positive washing water quantity, usually select 3 times water quantity. 2, single gas backwash: utilize the bubble formed in the process of gas rising to disturb filter layer, loosen the dirt of filter material deep level, make it penetrate filter layer deep place, loosen and take out the impurity tightly attached on filter material. Gas backwash is more water-saving than water backwash. 3, gas and water combined backwash: send air and backwash water from the lower part of static filter layer simultaneously, air forms big bubble in sand layer in the process of rising, changes into small bubble when meeting filter material, simultaneously produces scrubbing action to filter material surface;Backwash water top loose filter layer, make filter material present suspended state, beneficial to the scrubbing of air to filter material. The expansion effect of backwash water and backwash air is superimposed, compared with single, the action is stronger. 4, positive washing: through opening inlet valve, closing water production valve, let the backwash liquid high flow rate all flow out from the concentrated water upper valve, thereby carry out high speed scouring to membrane surface, reduce the enrichment of membrane surface pollution.

[0003] The current multi-medium filter backwashing technology has the following problems: 1. Single water backwashing: incomplete backwashing: for the dirt in the deep filter material layer, the shear force and collision friction of single water backwashing may not be enough to completely remove it, causing the pollution carrying capacity of the filter material layer to gradually decrease and the filtering effect to deteriorate. Water resource waste: a large amount of backwashing water is needed to achieve good cleaning effect, increasing the consumption of water resources. 2. Single air backwashing: limited disturbance to the filter material layer: although the bubbles have a certain disturbance effect on the filter material layer, some stubborn dirt adhering to the surface of the filter material may not be completely loosened and removed. Possible loss of filter material: if the intensity of air backwashing is not properly controlled, excessive air pressure may cause filter material particles to be blown out of the filter layer, causing loss of filter material. 3. Air and water combined backwashing: complex operation: the flow, pressure and other parameters of air and water need to be controlled simultaneously, the operation is relatively complex, and the technical level of the operator is relatively high. High equipment requirement: special air and water combined backwashing equipment such as air compressor and water pump is needed, and the equipment investment is large. Safety hazard: if the sequence of air and water is not properly controlled, backwashing water may enter the air pipeline, affecting the normal operation of the system, and even causing safety accidents. 4. Forward washing: limited cleaning effect: forward washing can only provide high-speed flushing to the surface of the membrane, and cannot effectively remove the dirt inside the filter material layer, so the cleaning effect is relatively poor. Cannot restore the performance of the filter material: the filter material layer cannot be restored to the initial state, and the pollution carrying capacity and filtering performance of the filter material cannot be effectively improved. Practical new type content

[0004] Therefore, the embodiment of the utility model provides a multi-medium filter's bimodal air washing and water level interlocking intelligent back flushing system to solve the problem of low back flushing efficiency and short service life of filter material in prior art.

[0005] The embodiment of the utility model provides a multi-medium filter's bimodal air washing and water level interlocking intelligent back flushing system, comprising:

[0006] Air washing unit, from bottom to top, the filter material of multi-medium filter is washed by air;

[0007] Water backwashing unit, comprising backwashing pump, first backwashing pipe, second backwashing pipe and third backwashing pipe;Wherein, one end of first backwashing pipe is connected to backwashing pump, the other end of first backwashing pipe is connected to the water outlet at the bottom of multi-medium filter tank;One end of second backwashing pipe is connected with the first water outlet arranged at the top of multi-medium filter tank, the other end of second backwashing pipe is connected with waste water pool;One end of third backwashing pipe is connected with the second water outlet arranged at the side of multi-medium filter tank, the other end of third backwashing pipe is connected with waste water pool;

[0008] The positive washing unit comprises a water inlet pump, a water inlet pipe and a water outlet pipe; one end of the water inlet pipe is connected with the water inlet pump, and the other end of the water inlet pipe is connected with a water inlet at the top of the multi-medium filter tank; one end of the water outlet pipe is connected with a water outlet at the bottom of the multi-medium filter tank, and the other end of the water outlet pipe is connected to the filtered water tank.

[0009] Optionally, the air washing unit comprises a blower, a first pneumatic valve and an air inlet pipe; one end of the air inlet pipe is connected to the blower, and the other end of the air inlet pipe is connected with an air inlet opening at the bottom end of the multi-medium filter; the first pneumatic valve is installed on the air inlet pipe for adjusting the air flow and pressure; the air washing unit discharges the air through the second backwashing pipe.

[0010] Optionally, the water backwashing unit further comprises a second pneumatic valve installed on the first backwashing pipe, a third pneumatic valve installed on the second backwashing pipe and a fourth pneumatic valve installed on the third backwashing pipe.

[0011] Optionally, the positive washing unit further comprises a fifth pneumatic valve installed on the water inlet pipe and a sixth pneumatic valve installed on the water outlet pipe.

[0012] Optionally, the second water outlet is arranged at the side of the multi-medium filter which is 0.1m higher than the filler layer.

[0013] Optionally, the system further comprises:

[0014] A first bypass path, one end of which is connected to the first backwashing pipe between the second pneumatic valve and the multi-medium filter, and the other end of which is connected to the wastewater tank; a first pressure sensor and a seventh pneumatic valve are arranged on the pipeline of the first bypass path.

[0015] Optionally, the system further comprises:

[0016] A second bypass path, one end of which is connected to the water inlet pipe between the fifth pneumatic valve and the multi-medium filter, and the other end of which is connected to the wastewater tank; a second pressure sensor and an eighth pneumatic valve are arranged on the pipeline of the second bypass path.

[0017] Optionally, the positive washing unit further comprises:

[0018] A manual valve and a flow meter, which are installed on the water inlet pipe between the water inlet pump and the fifth pneumatic valve in sequence.

[0019] Optionally, the system further comprises:

[0020] A drain pipe, one end of which is connected to the water outlet pipe between the water outlet of the multi-medium filter and the sixth pneumatic valve, and the other end of which is connected to the wastewater tank.

[0021] A ninth pneumatic valve is installed on the drain pipe.

[0022] The utility model discloses the beneficial effect of:

[0023] 1, backwash is complete: through the bimodal gas washing and optimized backwash step sequence, can effectively remove the dirt of filter material layer surface and inside, improve the pollution capacity and filter effect of filter material layer.

[0024] 2, water saving and energy saving: adopt accurate PID control and reasonable backwash parameter setting, reduce the water consumption of backwash, reduce the waste of water resources, reduce the energy consumption in backwash process simultaneously.

[0025] 3, simple operation: the whole backflush process realizes the automation control, and the operation is simple and convenient, reduces the technical level requirement to operating personnel, and reduces the possibility of human operation failure.

[0026] 4. The equipment has high reliability: through the optimization of equipment selection and control system design, the reliability and stability of the equipment are improved, and the equipment failure rate and maintenance cost are reduced.

[0027] 5. Good safety performance: in the air-water combined backwash process, through the accurate control of the sequence and flow, pressure and other parameters of air and water, the backwash water into the air pipeline is avoided, and the safe operation of the system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0028] The features and advantages of the utility model will be more clearly understood by referring to the attached drawings, and the attached drawings are schematic and should not be understood as any limitation to the utility model, and in the drawings:

[0029] Figure 1 The structure block diagram of the bimodal gas washing and water level interlocking intelligent backflush system of a multi-medium filter in the utility model embodiment is shown;

[0030] Figure 2 The gas washing unit operation schematic diagram of the bimodal gas washing and water level interlocking intelligent backflush system of a multi-medium filter in the utility model embodiment is shown;

[0031] Figure 3 The water backwash unit operation schematic diagram of the bimodal gas washing and water level interlocking intelligent backflush system of a multi-medium filter in the utility model embodiment is shown;

[0032] Figure 4 The positive flushing unit operation schematic diagram of the bimodal gas washing and water level interlocking intelligent backflush system of a multi-medium filter in the utility model embodiment is shown;

[0033] Figure 5 The structure diagram of the bimodal gas washing and water level interlocking intelligent backflush system of a multi-medium filter in the utility model embodiment is shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] The utility model embodiment provides a kind of double-mode air washing and water level interlocking intelligent backwash system of multi-medium filter, including air washing unit, water backwash unit and positive flushing unit, wherein, air washing unit is from bottom to top to the filter material of multi-medium filter carries out air washing.Water backwash unit includes backwash pump, first backwash pipe, second backwash pipe and third backwash pipe.The one end of first backwash pipe is connected to backwash pump, and the other end of first backwash pipe is connected to the water outlet at the bottom of multi-medium filter tank;The one end of second backwash pipe is connected with the first water outlet arranged at the top of multi-medium filter, and the other end of second backwash pipe is connected with waste water pool;The one end of third backwash pipe is connected with the second water outlet arranged at the side of multi-medium filter, and the other end of third backwash pipe is connected with waste water pool.Positive flushing unit includes water inlet pump, water inlet pipe and water outlet pipe.The one end of water inlet pipe is connected with water inlet pump, and the other end of water inlet pipe is connected with the water inlet at the top of multi-medium filter tank;The one end of water outlet pipe is connected with the water outlet at the bottom of multi-medium filter tank, and the other end of water outlet pipe is connected to filter water tank.

[0036] As shown in Figure 1 Air washing unit includes air blower, first pneumatic valve and air inlet pipe.The one end of air inlet pipe is connected to air blower, and the other end of air inlet pipe is connected with the air inlet opening in the bottom end of multi-medium filter;First pneumatic valve is installed on air inlet pipe, for adjusting gas flow and pressure;Air washing unit is discharged through second backwash pipe.

[0037] As optional implementation, water backwash unit further includes: second pneumatic valve installed on first backwash pipe, third pneumatic valve installed on second backwash pipe and fourth pneumatic valve installed on third backwash pipe.

[0038] As optional implementation, positive flushing unit further includes: fifth pneumatic valve installed on water inlet pipe and sixth pneumatic valve installed on water outlet pipe.

[0039] As optional implementation, second water outlet is opened at the side position of multi-medium filter at 0.1m above the filler layer.

[0040] As an optional implementation, it further comprises a first bypass path, one end of which is connected to the first backwashing pipe between the second pneumatic valve and the multi-medium filter, and the other end of which is connected to the wastewater pool; a first pressure sensor and a seventh pneumatic valve are arranged on the first bypass path.

[0041] As an optional implementation, it further comprises a second bypass path, one end of which is connected to the water inlet pipe between the fifth pneumatic valve and the multi-medium filter, and the other end of which is connected to the wastewater pool; a second pressure sensor and an eighth pneumatic valve are arranged on the second bypass path.

[0042] As an optional implementation, the positive flushing unit further comprises a manual valve and a flow meter, which are sequentially installed on the water inlet pipe between the water inlet pump and the fifth pneumatic valve.

[0043] As an optional implementation, it further comprises a drain pipe, one end of which is connected to the water outlet pipe between the water outlet of the multi-medium filter and the sixth pneumatic valve, and the other end of which is connected to the wastewater pool; a ninth pneumatic valve is installed on the drain pipe.

[0044] The working principle of a dual-mode air washing and water level interlocking intelligent backwashing system of a multi-medium filter provided by the embodiment is described below:

[0045] I. Backwashing step sequence control

[0046] 1.1. Preparation and drainage phase

[0047] After the system starts the backwashing process, it first enters the backwashing preparation phase, which lasts for 60 seconds. During this period, the initial state of each related valve and equipment is checked and adjusted to ensure the smooth operation of the subsequent backwashing operation. After preparation is completed, the drainage valve (i.e., the ninth pneumatic valve) is opened, and a 5-minute drainage operation is performed to empty the water in the filter for processing, creating conditions for air washing.

[0048] 1.2. Air washing phase

[0049] As shown in Figure 2 , after the drainage is completed, the air washing program is immediately started. The air washing process is divided into two times. The first air washing lasts for 5 minutes, and the air sent by the air blower is used to flush the filter material layer to produce mutual friction and disturbance between the filter particles, loosen the attached impurities and dirt; after the first air washing is completed, a short interval is performed, and the second air washing is performed for 10 seconds to further strengthen the flushing effect of the filter material layer and ensure that the dirt on the surface of the filter material is effectively removed. During the air washing process, the air volume and air pressure are precisely controlled to ensure that the flushing intensity is moderate and to avoid excessive impact on the filter material, which may cause damage.

[0050] 1.3. Static and water backwashing phase

[0051] After two air washing, the filter into the 2 minutes of standing phase, let the filter layer under the action of gravity preliminary settlement stability. After the end of the standing, start water backwash process, as shown in Figure 3 , using the backwash pump water with a certain flow rate into the filter, the filter layer for thorough flushing, the air washing loose dirt and impurities inside the filter thoroughly out of the filter. Water backwash process, according to the preset water flow, flow rate parameters for accurate control, to ensure the effect of backwash while avoiding waste of water resources.

[0052] 1.4, again and positive washing stage

[0053] Water backwash, the filter is again 3 minutes of standing, make the filter layer further settlement stability, while allowing the remaining small amount of dirt under the action of gravity naturally. Subsequently, open the water pump, as shown in Figure 4 , using the water to filter for positive washing, washing time 10 minutes, through the scouring effect of water flow, further remove the filter layer surface and internal may remain dirt, to ensure that the filter to restore good filtering performance, positive washing of water quality used in line with the filter operation requirements.

[0054] II, water and backwash PID design

[0055] 2.1, water system

[0056] As shown in Figure 5 , water pump with limit switch pneumatic double acting valve (FV-10301A), water pipe from the top of the multi-media filter access, to ensure that the water evenly distributed on the filter layer. The water outlet is located at the bottom of the filter, and install limit switch pneumatic double acting valve (FV-10305A), used to control the discharge of water after filtration. When the filter is in repair state, start the number FV-10303A double acting pneumatic valve, the water is temporarily guided to the waste water pool, to avoid the impact of water pressure on the filter or pollution of normal water, the whole water system through the PID control to achieve the precise regulation of water flow, water level, to ensure the stable operation of the filter under different conditions.

[0057] 2.2, backwash system

[0058] As shown in Figure 5The backwash pump is also provided with a double-acting pneumatic valve (FV-10302A), and the backwash pipe is connected with the water outlet pipe and provided with a bypass pipe, a pressure gauge and a double-acting pneumatic valve (FV-10309A) installed on the bypass pipe, for monitoring and adjusting the backwash pressure. If the backwash amount exceeds the set threshold, the excessive backwash flow can be controlled to be discharged into the waste water tank through the corresponding valve, so as to prevent the backwash water from polluting the environment or interfering with the subsequent treatment process. The backwash water outlet is provided on the tank top and provided with a double-acting pneumatic valve (FV-10307A), and another double-acting pneumatic valve is provided 0.1 m above the filler layer, so as to effectively discharge the water above the filler during the backwash process, while ensuring that the filler retains an appropriate amount of moisture to maintain the stability of the filter material performance. The backwash system accurately controls the operation frequency of the backwash pump, the backwash water amount and the pressure through PID control, so as to realize efficient and energy-saving backwash operation.

[0059] III. Air-water combined backwash of multi-medium filter

[0060] 3.1. Air first and then water backwash mode

[0061] First, the filter tank water level is lowered to 100 mm above the filter layer surface, and then air is introduced for several minutes of flushing. This mode is suitable for filter tanks with heavy surface contamination and relatively light internal contamination. During operation, it is necessary to ensure that the relevant valves are tightly closed to prevent the water level from falling below the filter layer surface, causing the upper part of the filter layer to lack water infiltration, resulting in the particles to be disturbed upwards and downwards, and the dirt to be effectively discharged, but to migrate to the deep part of the filter layer, affecting the backwash effect.

[0062] 3.2. Air-water combined backwash mode

[0063] Air and backwash water are simultaneously introduced from the lower part of the static filter layer. The air gathers to form large air bubbles in the sand layer during the rising process, and when it encounters the filter material, it is dispersed into small air bubbles, which produces a strong scrubbing effect on the surface of the filter material. At the same time, the backwash water loosens the filter layer, making the filter material in a suspended state, further enhancing the scrubbing effect of the air on the filter material. Due to the superposition of the expansion effects of the backwash water and the backwash air, the combined backwash effect is stronger than that of a single backwash method, which can effectively remove the dirt in the deep part of the filter material. When implementing air-water combined backwash, attention should be paid to the differences in backwash pressure and intensity of air and water, and the operation should be strictly in sequence to avoid the backwash water entering the air pipeline and affecting the normal operation of the system.

[0064] 3.3. Treatment after backwash

[0065] After the air-water combined backwashing is finished, the air entering is immediately stopped, but the backwashing water keeps the same flow to continue washing for 3 to 5 minutes, so as to completely remove the air bubbles left in the filter bed and ensure that the filter material layer restores good filtering performance. In this process, the state of the top double-hole exhaust valve can be observed, and the residual gas is discharged in time, so as to guarantee the backwashing effect and the stability of the subsequent operation of the filter.

[0066] The embodiment provides a double-mode air washing and water level interlocking intelligent backwashing system of a multi-medium filter, and the following beneficial effects are achieved: 1. complete backwashing: through double-mode air washing and an optimized backwashing step sequence, dirt on the surface and inside of the filter material layer can be effectively removed, the dirt-carrying capacity and filtering effect of the filter material layer are improved; 2. water and energy saving: precise PID control and reasonable backwashing parameter setting are adopted, the amount of backwashing water is reduced, the waste of water resources is reduced, and the energy consumption in the backwashing process is reduced; 3. simple operation: the whole backwashing process is automatically controlled, and the operation is simple and convenient, the technical level requirement of an operator is reduced, and the possibility of human operation error is reduced; 4. high equipment reliability: through optimization of equipment selection and control system design, the reliability and stability of the equipment are improved, the equipment failure rate and maintenance cost are reduced; 5. good safety performance: in the air-water combined backwashing process, the sequence and flow, pressure and other parameters of air and water are accurately controlled, the backwashing water is prevented from entering the air pipeline, and the safe operation of the system is ensured.

[0067] Although the embodiments of the utility model are described in combination with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and changes all fall within the scope defined by the appended claims.

Claims

1. A dual mode air washing and water level interlocked intelligent backwash system for multi-media filter characterized in that, The application relates to a multi-medium filter, which comprises the following parts: an air washing unit for air washing the filter material of the multi-medium filter from bottom to top; a water backwashing unit, which comprises a backwashing pump, a first backwashing pipe, a second backwashing pipe and a third backwashing pipe; one end of the first backwashing pipe is connected to the backwashing pump, and the other end of the first backwashing pipe is connected to a water outlet at the bottom of the multi-medium filter tank; one end of the second backwashing pipe is connected to a first water outlet arranged at the top of the multi-medium filter tank, and the other end of the second backwashing pipe is connected to a waste water pool; one end of the third backwashing pipe is connected to a second water outlet arranged at the side of the multi-medium filter, and the other end of the third backwashing pipe is connected to the waste water pool; a positive flushing unit, which comprises a water inlet pump, a water inlet pipe and a water outlet pipe; one end of the water inlet pipe is connected to the water inlet pump, and the other end of the water inlet pipe is connected to a water inlet at the top of the multi-medium filter tank; one end of the water outlet pipe is connected to the water outlet at the bottom of the multi-medium filter tank, and the other end of the water outlet pipe is connected to a filtered water tank.

2. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter as claimed in claim 1 wherein, The air washing unit comprises a blower, a first pneumatic valve and an air inlet pipe; one end of the air inlet pipe is connected to the blower, and the other end of the air inlet pipe is connected to an air inlet arranged at the bottom end of the multi-medium filter; the first pneumatic valve is arranged on the air inlet pipe and used for adjusting the gas flow and pressure; the air washing unit discharges gas through the second backwashing pipe.

3. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter as claimed in claim 1 wherein, The water backwashing unit further comprises a second pneumatic valve arranged on the first backwashing pipe, a third pneumatic valve arranged on the second backwashing pipe and a fourth pneumatic valve arranged on the third backwashing pipe.

4. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter of claim 1, wherein, The positive flushing unit further comprises a fifth pneumatic valve arranged on the water inlet pipe and a sixth pneumatic valve arranged on the water outlet pipe.

5. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter of claim 1, wherein, The second water outlet is arranged at the side of the multi-medium filter which is 0.1 m higher than the filler layer.

6. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter of claim 3, wherein, The application further comprises: a first bypass pipe, one end of which is connected to the first backwashing pipe between the second pneumatic valve and the multi-medium filter, and the other end of which is connected to the waste water pool; a first pressure sensor and a seventh pneumatic valve are arranged on the first bypass pipe.

7. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter as claimed in claim 4 wherein, The application further comprises: a second bypass pipe, one end of which is connected to the water inlet pipe between the fifth pneumatic valve and the multi-medium filter, and the other end of which is connected to the waste water pool; a second pressure sensor and an eighth pneumatic valve are arranged on the second bypass pipe.

8. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter of claim 4, wherein, The positive flushing unit further comprises: a manual valve and a flow meter, which are arranged on the water inlet pipe between the water inlet pump and the fifth pneumatic valve in sequence.

9. The dual mode air washing and water level interlocked intelligent backwash system of multi-media filter of claim 4, wherein, The application further comprises: a drain pipe, one end of which is connected to the water outlet pipe between the water outlet of the multi-medium filter and the sixth pneumatic valve, and the other end of which is connected to the waste water pool; a ninth pneumatic valve arranged on the drain pipe.

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