WO2021109329A1 - Filtre en matériau filtrant léger à écoulement ascendant à vitesse variable et à lavage à contre-courant par quantité d'eau microscopique, et procédé associé - Google Patents

Filtre en matériau filtrant léger à écoulement ascendant à vitesse variable et à lavage à contre-courant par quantité d'eau microscopique, et procédé associé Download PDF

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Publication number
WO2021109329A1
WO2021109329A1 PCT/CN2020/072602 CN2020072602W WO2021109329A1 WO 2021109329 A1 WO2021109329 A1 WO 2021109329A1 CN 2020072602 W CN2020072602 W CN 2020072602W WO 2021109329 A1 WO2021109329 A1 WO 2021109329A1
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Prior art keywords
water
filter
valve
backwash
zone
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PCT/CN2020/072602
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English (en)
Chinese (zh)
Inventor
夏文香
石志慧
李金成
宋双
越楚遥
赵宝秀
刘杰
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青岛理工大学
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Priority to JP2021506731A priority Critical patent/JP7145544B2/ja
Publication of WO2021109329A1 publication Critical patent/WO2021109329A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/16—Upward filtration
    • B01D24/165—Upward filtration the filtering material being supported by pervious surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/38—Feed or discharge devices
    • B01D24/40—Feed or discharge devices for feeding
    • B01D24/402—Feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B01D24/4636—Counter-current flushing, e.g. by air with backwash shoes; with nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
    • B01D24/4673—Regenerating the filtering material in the filter by moving the filtering element using rotary devices or vibration mechanisms, e.g. stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
    • B01D24/4869—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration by level measuring

Definitions

  • the invention belongs to the technical field of water treatment, and is suitable for small and medium-sized water supply treatment, advanced sewage treatment and industrial reuse water treatment, and relates to an upward variable-speed flow light suspension filter material filter.
  • it is a water-saving type micro-water backwashing variable-speed upward-flow lightweight filter material filter and its method.
  • Filter layer filtration technology is an important process unit in the water and wastewater treatment process.
  • a certain thickness of filter layer is constructed by selecting granular filter materials of different materials, and the gap between the particles is used to form a filter channel to intercept suspended impurities in the water.
  • the commonly used filters mainly include ordinary pressure filters, valveless filters, fiber filter media filter tanks and other filters.
  • Ordinary fast filter is the most traditional filter.
  • quartz sand is used as the filter material, and the filtering method adopts downward flow. Because of the pollutants trapped in the filtration process, it needs to be backwashed with water to peel off the filter layer and recover.
  • the filter layer has the ability to intercept dirt, so backwashing needs to use high-speed water flow to reverse the filter layer.
  • the valveless filter adopts the hydraulic principle to form the characteristics of automatic backwashing, but the backwashing water volume of the valveless filter is also high, and the backwashing is not thorough.
  • fiber filter media filter is also a common filter form.
  • the filter material can be fiber balls and fiber bundles. This form of filter has the characteristics of high filtration speed and not easy to foul, but There is a problem that the water consumption of recoil is large, and the filter material should be compacted.
  • EPS expandable polystyrene particles
  • lightweight suspension filter media have high mechanical strength, strong decontamination ability, and stable chemical properties.
  • the specific gravity is smaller than that of water, the filtering method is simple, and the application range is wide.
  • the lightweight suspension filter has a greater economic advantage, that is, the influent buffer section can be used for precipitation.
  • the supporting layer is needed, the structure is simple, and the infrastructure cost is reduced.
  • the French Deliman Company has developed a new type of upward flow suspension filter by using lightweight filter media, which has a unique backwashing method.
  • the purpose of the present invention is to overcome the shortcomings of the existing upflow filter technology, by creatively changing the shape and composition of the filter, to optimize the filter structure and reduce the filtering resistance, and at the same time use the pressure change of the variable flow to form a self-compression function.
  • the backwashing process cleverly uses the gravity of the trapped dirt, and relies on air washing to naturally separate the debris from the filter material, realizes a micro-water backwash, and greatly reduces the water consumption and energy consumption of the backwash.
  • a new type of micro-water recoil variable-speed upward-flow lightweight suspended filter material filter and its method are established.
  • a micro-water backflush variable-speed upward-flow lightweight filter material filter including: reactor 1, water inlet water distribution system, gas backwash system, micro-water backwash spray system, water collection system, drainage/sludge discharge system ;
  • reactor 1 The inside of reactor 1 is divided into water inlet/sludge discharge area 2, backwash stripping area 3, variable speed filter area 4, compaction filter area 5, water collection area 6; an anti-floating filter plate is installed on the upper part of compaction filter area 5 12.
  • a filter head 13 is installed on the anti-floating filter plate 12, a cover plate 14 is installed directly above the anti-floating filter plate 12, a deflector is provided around the cover plate 14, and an exhaust valve 9 is provided on the cover plate 14;
  • the water inlet/sludge discharge zone 2 is located at the bottom of the reactor 1, the backwash stripping zone 3 is located on the upper part of the water inlet zone 2, and the backwash stripping zone 3 is cylindrical.
  • the volume of the backwash stripping zone 3 and the variable speed filter zone 4 and pressure The total volume of the actual filter zone 5 is equal, and the dirt in the water to be treated will first be intercepted by the filter layer of the variable-speed filter zone;
  • variable-speed filter zone 4 is located at the upper part of the backwash stripping zone 3.
  • the cross-sectional area of this zone gradually decreases from bottom to top, and is in the shape of a truncated cone. Because the water flow rate is constant, the cross-sectional area decreases, and the filter layer in this area is affected by the The upward filtration rate pressure also gradually increases;
  • the compaction filter zone 5 is located in the upper part of the variable-speed filter zone 4, which is cylindrical, and its cross-sectional area is the same as that of the upper part of the variable-speed filter zone 4.
  • the initial water flow velocity of the compacted filter zone 5 is that of the variable-speed filter zone 4.
  • the maximum water flow rate, the filter layer of which is subjected to the greatest pressure, and the filter layer is the densest.
  • the raw water to be treated enters the bottom of the reactor 1 through the water inlet/sludge discharge zone 2, and then passes through the backwash stripping zone 3, the variable speed filter zone 4, and the compaction filter zone 5 for interception and filtration.
  • the water passes through the filter head and meets the cover plate 14, passes through the deflector of the cover plate 14 and flows into the clear water tank 15, and then enters the catchment area 6 through the overflow weir 16, and finally the water is collected into the clear water tank 38 by the outlet pipe 17.
  • the filter material filled in the reactor is expandable polystyrene particles (EPS) 36, and the particle size specification is 0.5-1 mm.
  • EPS expandable polystyrene particles
  • the filter, the inlet water distribution system includes: a raw water tank 37, a water pump 18, a raw water inlet pipe 10, an inlet valve 25 and a reflector 11; the raw water inlet pipe 10 is equipped with an inlet valve 25, and the reflector 11 is located in the inlet pipe
  • the raw water tank 37 is connected to the inlet of the water pump 18, the outlet of the pump 18 is connected to the raw water inlet pipe 10 and the inlet valve 25, and the reflector 11 is located directly below the raw water inlet pipe 10.
  • the water to be treated is pressurized by a water pump and transported into the water inlet/sludge discharge area 2 at the bottom of the reactor 1 through the raw water inlet pipe, and the inlet water is uniformly distributed through the reflector 11.
  • the filter, the water collection system includes a clean water outlet pipe 17 and a clean water tank 38.
  • One end of the clean water outlet pipe 17 is connected to the water collection area 6, and the other end is connected to the clean water tank 38.
  • the filter, the micro-water backwash spray system includes a clean water pump 19, a micro-water backwash main pipe 23, a micro-water backwash valve 30 and a valve 31, a micro-water backwash spray branch 8 and a filter aid spray head 24 , Liquid level sensor 35 and liquid level detection instrument 34; clean water pump 19 is connected to clean water tank 38, clean water pump 19 is connected to micro water backwash spray branch pipe through micro water recoil main pipe 23, micro water recoil valve 30, valve 31 8.
  • Micro-water recoil spray branch pipes 8 are circumferentially arranged outside the compaction filter zone 5 and the variable-speed filter zone 4.
  • Each micro-water recoil spray branch pipe 8 is provided with a plurality of filter aid washing nozzles 24 to pass the water Into the compaction filter zone 5 and the variable speed filter zone 4; the liquid level sensor 35 is set on the top of the backwash stripping zone 3, and is connected with the liquid level detection instrument 34 through the data line, and is used for the basis of the backwashing process. The water level sensing result of the liquid level sensor 35 controls the water level at the top of the backwash stripping zone 3.
  • the filter and air backwash system includes an air compressor 20, a backwash air pipe 22, a backwash air pipe nozzle 7, a backwash air valve 28 and a check valve 26, and a backwash air release valve 9.
  • the drain pipe 21 of the reactor 1 is equipped with a drain/sludge valve 27; the backwash gas pipe 22 in the reactor 1 is provided with evenly distributed backwash gas pipe nozzles 7 on the pipe section at the bottom of the backwash stripping zone 3.
  • a backwash gas valve 28 and a check valve 26 to prevent water pouring are installed on the flushing gas pipe 22; an exhaust valve 9 is provided on the top cover of the reactor 1;
  • the filter, the drainage/sludge system includes a drainage/sludge pipe 21, a drainage/sludge valve 27, a drainage/sludge pipe 21 is arranged at the bottom of the water/sludge area 2, and a drainage/sludge pipe 21 A drain/sludge valve 27 is provided on it.
  • the operation process of the micro-water backflush, variable-speed upward-flow lightweight filter material filter is divided into: (1) filtration process; (2) backwash process; (3) light filter material layer reset process ; Three processes are carried out in cycles;
  • (1) Filtration process Close the drain/sludge valve 27, the backwash intake valve 28 and the connecting valve 29, open the water inlet valve 25 and the exhaust valve 9, start the water inlet pump 18, and the raw water tank 37 will be placed in the raw water tank 37 by the water pump 18
  • the treated water is transported into the reactor 1 through the water inlet pipe 10, and the water to be treated flows from the water inlet pipe 10 through the reflector 11 for uniform water distribution.
  • the filtered water flows upward through the backwash stripping zone 3, the variable speed filter zone 4, and the compaction filter zone 5 in turn. Finally, the water flow filter head enters the clean water area.
  • the effluent is first discharged from the exhaust pipe.
  • the exhaust valve 9 is closed, and the water flows into the clean water tank 15 through the deflector, and then passes through the overflow.
  • the weir 16 flows into the water collection area 6 and finally enters the clean water tank 38 through the outlet pipe 17.
  • the micro-water spray assists in the adjustment of the distribution of the lightweight filter material during the ascending process, and the effect of the rising filter material on the anti-floating filter plate and the water flow upward Under the pressure, the filter layer is gradually compacted.
  • close the micro-water spray inlet valve 30 and valve 31 continue to keep the micro-water spray pump 19 running for 5-10 minutes, then close the micro-water spray pump 19 and the connecting valve 29 , Complete the reset process of the filter layer.
  • the present invention has the following advantages:
  • the first is to adopt a variable filter cross-section design to form a filter state where the filter speed is changed from slow to fast, and the pressure is changed from low to high. It can not only achieve the purpose of automatic compression of the filter layer by hydraulic pressure during filtration, but also solve the previous light filter.
  • the material filter layer itself cannot be compacted and the pores are loose;
  • the second is to use the gravity of the trapped sludge during backwashing to separate it from the filter material through air flushing and stirring, and to separate it from the light filter material by gravity sedimentation, eliminating the need for backwashing water, saving water and reducing consumption;
  • the fourth is that the upward flow relies on hydraulic compaction to automatically form a large to small distribution of pores, which conforms to the grading principle of the filtration process, so the filtration resistance is small and energy saving.
  • the micro-water backflushing variable-speed upward-flow lightweight filter material of this embodiment includes: reactor 1, inlet water distribution system, gas backwashing system, micro-water backwashing spray system, water collection system, drainage/sludge removal system.
  • Reactor 1 is made of stainless steel.
  • the interior of reactor 1 is divided into water inlet/sludge discharge zone 2, backwash stripping zone 3, variable-speed filtration zone 4, compaction filtration zone 5, and water collection zone 6, of which variable-speed filtration zone 4 and pressure
  • the filter material filled in the solid filter zone 5 is expandable polystyrene particles (EPS) 36 with a particle size of 0.5 to 1 mm; an anti-floating filter plate 12 and an anti-floating filter plate 12 are installed on the upper part of the compacted filter zone 5
  • a filter head 13 is installed on it, a cover plate 14 is installed directly above the anti-floating filter plate 12, a baffle plate is provided around the cover plate 14, and an exhaust valve 9 is provided on the cover plate 14;
  • EPS expandable polystyrene particles
  • the water inlet/sludge discharge zone 2 is located at the bottom of the reactor 1, the backwash stripping zone 3 is located on the upper part of the water inlet zone 2, and the backwash stripping zone 3 is cylindrical, and the volume is the same as the volume of the variable speed filter zone 4 and the compaction filter zone 5.
  • the filter material filled in the filter area is expandable polystyrene particles (EPS), and the size of the filter material can be 0.5 ⁇ 1mm.
  • EPS expandable polystyrene particles
  • the dirt in the water to be treated will be the first filter layer of the variable speed filter area.
  • the variable-speed filter zone 4 is located in the upper part of the backwash stripping zone 3.
  • the filter material filled in the variable-speed filter zone 4 is expandable polystyrene particles (EPS), and the particle size of the filter material can be selected from 0.5 to 1 mm.
  • EPS expandable polystyrene particles
  • the compaction filter zone 5 is located in the upper part of the variable-speed filter zone 4, which is cylindrical, and its cross-sectional area is the same as that of the upper part of the variable-speed filter zone 4.
  • the initial water flow velocity of the compacted filter zone 5 is that of the variable-speed filter zone 4.
  • the maximum water flow rate, the filter layer of which is the most stressed, the filter layer is the densest, the filled filter material is expandable polystyrene particles (EPS), the particle size of the filter material can be selected from 0.5 to 1mm.
  • EPS expandable polystyrene particles
  • the raw water to be treated enters the bottom of the reactor 1 through the water inlet/sludge discharging zone 2, and then passes through the backwash stripping zone 3, the variable speed filter zone 4, and the compaction filter zone 5 to intercept and filter.
  • the filtered water will encounter To the cover plate 14, the flow deflector of the cover plate 14 flows into the clean water tank 15, and then enters the water collection area 6 through the overflow weir 16, and finally the water is collected into the clean water tank 38 by the outlet pipe 17.
  • the inlet water distribution system includes: a raw water tank 37, a water pump 18, a raw water inlet pipe 10, an inlet valve 25 and a reflector 11; the raw water inlet pipe 10 is equipped with an inlet valve 25, and the reflector 11 is located directly below the inlet of the water pipe.
  • the water is distributed evenly; the raw water tank 37 is connected to the water inlet of the water pump 18, the outlet of the water pump 18 is connected to the raw water inlet pipe 10 and the water inlet valve 25, and the reflector 11 is located directly below the nozzle of the raw water inlet pipe 10.
  • the water to be treated is pressurized by a water pump and transported into the water inlet/sludge discharge area 2 at the bottom of the reactor 1 through the raw water inlet pipe, and the inlet water is uniformly distributed through the reflector 11.
  • the water collection system includes a clean water outlet pipe 17 and a clean water tank 38.
  • One end of the clean water outlet pipe 17 is connected to the water collection area 6, and the other end is connected to the clean water tank 38.
  • the micro-water backwashing spray system includes a clean water pump 19, a micro-water back-flushing main pipe 23, a micro-water back-flushing valve 30 and valve 31, a micro-water back-flushing spray branch pipe 8 and a filter aid nozzle 24, and a liquid level sensor 35 And liquid level detection instrument 34;
  • the clean water pump 19 is connected to the clean water tank 38, the clean water pump 19 is connected to the micro water backwash spray branch pipe 8 through the micro water backwash main pipe 23, the micro water backwash valve 30, and the valve 31.
  • the spray branch pipe 8 is circumferentially arranged outside the compaction filter zone 5 and the variable-speed filter zone 4, and each micro-water backwash spray branch pipe 8 is provided with a plurality of filter aid washing nozzles 24 to pass water into the compaction filter zone 5 And the inside of the variable-speed filter zone 4;
  • the liquid level sensor 35 is arranged on the top of the backwash stripping zone 3, and is connected with the liquid level detection instrument 34 through a data line, and is used to adjust the liquid level sensor 35 during the backwashing process.
  • the water level sensing result controls the water level at the top of the backwash stripping zone 3;
  • the micro-water backwashing system has two functions. One is that after the filtration is completed, when entering the backwashing stage, the backwashing spray action is used to promote the compacted lightweight filter material 36 to disperse and fall back to the backwashing stripping zone 3. . Second, during the resetting process of the filter material after the backwashing is completed, the surface of the light filter material 36 is further washed by the backwash spray effect, and at the same time it plays a role in promoting the uniform arrangement of the filter material.
  • the air backwash system includes an air compressor 20, a backwash air pipe 22, a backwash air pipe nozzle 7, a backwash air valve 28 and a check valve 26, and a backwash air release valve 9.
  • the drain pipe 21 of the reactor 1 is equipped with a drain/sludge valve 27; the backwash gas pipe 22 in the reactor 1 is provided with evenly distributed backwash gas pipe nozzles 7 on the pipe section at the bottom of the backwash stripping zone 3.
  • a backwash gas valve 28 and a check valve 26 to prevent water pouring are installed on the flushing gas pipe 22; an exhaust valve 9 is provided on the top cover of the reactor 1;
  • the drainage/sludge system includes a drainage/sludge pipe 21, a drainage/sludge valve 27.
  • the drainage/sludge pipe 21 is set at the bottom of the water/sludge area 2, and the drainage/sludge pipe 21 is equipped with a drainage/drainage pipe. Mud valve 27.
  • the operation process of the micro-water backflush variable-speed upward-flow lightweight filter material filter is divided into: (1) filtration process; (2) backwash process; (3) light filter material layer reset process; the above three process cycles get on.
  • (1) Filtration process Close the drain/sludge valve 27, the backwash intake valve 28 and the connecting valve 29, open the water inlet valve 25 and the exhaust valve 9, start the water inlet pump 18, and the raw water tank 37 will be placed in the raw water tank 37 by the water pump 18
  • the treated water is transported into the reactor 1 through the water inlet pipe 10, and the water to be treated flows from the water inlet pipe 10 through the reflector 11 for uniform water distribution.
  • the filtered water flows upward through the backwash stripping zone 3, the variable speed filter zone 4, and the compaction filter zone 5 in turn. Finally, the water flow filter head enters the clean water area.
  • the effluent is first discharged from the exhaust pipe.
  • the exhaust valve 9 is closed, and the water flows into the clean water tank 15 through the deflector, and then passes through the overflow.
  • the weir 16 flows into the water collection area 6 and finally enters the clean water tank 38 through the outlet pipe 17.
  • the micro-water spray assists in the adjustment of the distribution of the lightweight filter material during the ascending process, and the effect of the rising filter material on the anti-floating filter plate and the water flow upward Under the pressure, the filter layer is gradually compacted.
  • close the micro-water spray inlet valve 30 and valve 31 continue to keep the micro-water spray pump 19 running for 5 minutes, close the micro-water spray pump 19 and the connecting valve 29, complete The reset process of the filter layer.
  • Reactor maintenance The reactor has been running for about 1 year, and the filter material needs to be supplemented or replaced.
  • the filter material When replenishing or replacing the filter material, open the drain/sludge valve 27, the backwashing aid valve 30 and the valve 31, and close the valve 25, the backwash air valve 28 and the connecting valve 29.
  • the filter material moves down with the water level and waits for the liquid level.
  • the detecting instrument 34 shows that the water level drops below the lower edge of the filter material replacement port, close the drain/sludge valve 27, stop the backflush water pump 19, open the filter material replacement port 33, and replenish or replace the filter material; add the filter material When finished, close the filter replacement port 33, and start filtering according to the filtering process operation.
  • the filter reactor is used to perform advanced treatment on the effluent after the secondary settling tank of a sewage treatment plant. It can be seen from Table 1 that the reactor has a very good removal effect on turbidity in water.
  • the turbidity of the influent water of the reactor is 7.134 ⁇ 36.270 NTU, the turbidity of the effluent of the reactor can reach below 1 NTU, and the turbidity removal rate is between 94.5% and 97.7%.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne un filtre en matériau filtrant léger à écoulement ascendant à vitesse variable et à lavage à contre-courant par quantité d'eau microscopique et un procédé de fonctionnement associé. Le filtre comprend un réacteur (1), un système d'admission et de distribution d'eau, un système de lavage à contre-courant de gaz, un système de pulvérisation à contre-courant d'eau microscopique, un système de collecte d'eau et un système d'évacuation d'eau/d'évacuation de boue ; l'intérieur du réacteur (1) est divisé en une zone (2) de prise d'eau/d'évacuation de boue, une zone (3) de décapage par lavage à contre-courant, une zone (4) de filtration à vitesse variable, une zone (5) de filtration par compactage et une zone (6) de collecte d'eau ; une plaque (12) de filtration anti-flottaison est disposée sur la partie supérieure de la zone (5) de filtration par compactage, la plaque (12) de filtration anti-flottaison est pourvue d'une tête filtrante (13), une plaque de couverture (14) est disposée directement au-dessus de la plaque (12) de filtration anti-flottaison, une plaque de guidage d'écoulement est disposée à la périphérie de la plaque de couverture (14), et une soupape d'échappement (9) est disposée sur la plaque de couverture (14) ; la zone (2) de prise d'eau/d'évacuation de boue est située au fond du réacteur (1), la zone (3) de décapage par lavage à contre-courant est située au niveau de la partie supérieure de la zone de prise d'eau (2), la zone (3) de décapage par lavage à contre-courant est de forme cylindrique, et le volume de la zone (3) de décapage par lavage à contre-courant est égale à la somme du volume de la zone (4) de filtration à vitesse variable et le volume de la zone (5) de filtration par compactage ; la zone (4) de filtration à vitesse variable est située au niveau de la partie supérieure de la zone (3) de décapage par lavage à contre-courant, et la surface de section transversale de la zone diminue progressivement de bas en haut et se présente sous la forme d'un cône tronqué ; et la zone (5) de filtration par compactage est située au niveau de la partie supérieure de la zone (4) de filtration à vitesse variable et est cylindrique, et la surface de section transversale de la zone de filtration par compactage est la même que la surface de section transversale de la partie supérieure de la zone (4) de filtration à vitesse variable.
PCT/CN2020/072602 2019-12-05 2020-01-17 Filtre en matériau filtrant léger à écoulement ascendant à vitesse variable et à lavage à contre-courant par quantité d'eau microscopique, et procédé associé WO2021109329A1 (fr)

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JP2021506731A JP7145544B2 (ja) 2019-12-05 2020-01-17 微小水量逆洗変速上向流式軽量濾材フィルタ及びその方法

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CN201911231163.XA CN110917679B (zh) 2019-12-05 2019-12-05 一种微水量反冲变速上向流轻质滤料过滤器及其方法
CN201911231163.X 2019-12-05

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CN114813312A (zh) * 2022-04-22 2022-07-29 河北理工工程管理咨询有限公司 一种工程监理用给水管道试压装置
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CN112973273B (zh) * 2021-02-07 2022-03-01 宁波财经学院 一种自动反冲洗过滤装置
CN114470892A (zh) * 2022-01-12 2022-05-13 武汉理工大学 一种水力旋流式反冲洗过滤装置及方法
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