JP4042967B2 - Filtration device backwash method - Google Patents

Filtration device backwash method Download PDF

Info

Publication number
JP4042967B2
JP4042967B2 JP2003021857A JP2003021857A JP4042967B2 JP 4042967 B2 JP4042967 B2 JP 4042967B2 JP 2003021857 A JP2003021857 A JP 2003021857A JP 2003021857 A JP2003021857 A JP 2003021857A JP 4042967 B2 JP4042967 B2 JP 4042967B2
Authority
JP
Japan
Prior art keywords
water
backwashing
backwash
filter element
lower chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2003021857A
Other languages
Japanese (ja)
Other versions
JP2004230287A (en
Inventor
淳 中円尾
利夫 森田
幹雄 菅野
Original Assignee
オルガノ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オルガノ株式会社 filed Critical オルガノ株式会社
Priority to JP2003021857A priority Critical patent/JP4042967B2/en
Publication of JP2004230287A publication Critical patent/JP2004230287A/en
Application granted granted Critical
Publication of JP4042967B2 publication Critical patent/JP4042967B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backwashing method for a filtration device, and more particularly to a backwashing method for a filtration device of a type in which a filter element is suspended from a partition plate provided in a filtration tower.
[0002]
[Prior art]
If the filter element is placed in the filtration tower and the purpose is to remove suspended substances in water, if the differential pressure of the filtration apparatus increases due to repeated removal of suspended substances, filtered water or backwash water There is a “backwashing type filtration device” in which the filter element is washed back to recover the differential pressure, and a “non-backwashing type filtration device” in which the filter element is replaced without performing such backwashing.
[0003]
In the backwash type filtration device, the backwashing method and the flow direction of backwashing water differ depending on the filter element mounting form in the filtration device. As main filter element mounting forms, there are a “filter element hanging type” as shown in FIG. 4 and a “filter element lower fixed type” as shown in FIG.
[0004]
In the filter element hanging type filtration device 21 shown in FIG. 4, the upper chamber 24 and the lower chamber 25 are partitioned by a partition plate 23 provided in the upper part of the filtration tower 22, and the filter element 26 is provided on the partition plate 23. Suspended and fixed. In general, the water to be treated is introduced from the lower part of the filter tower 22 and filtered by the filter element 26, and then the treated water is collected in the upper chamber 24 and sent from there to a predetermined destination.
[0005]
On the other hand, in the filter element 31 fixed to the lower part of the filter element shown in FIG. 5, the upper chamber 34 and the lower chamber 35 are partitioned by a partition plate 33 provided at the lower portion in the filtration tower 32, and the filter element is separated by the partition plate 33. The lower part of the filter element 36 is fixed to the partition plate 33 so that 36 is erected. As a general fixing structure in this case, as shown in FIG. 5, a filter adapter (communication pipe) 37 penetrating the partition plate 33 is fixed to the partition plate 33, and the filter element 36 is joined to the filter adapter 37. . Water to be treated is introduced into the upper chamber 34 from the lower or upper part of the apparatus, filtered by the filter element 36, collected as the treated water in the lower chamber 35 partitioned by the partition plate 33 through the filter adapter 37, and there. Sent to a predetermined destination.
[0006]
In a general backwashing method in such a filter element lower fixed type filtration device 31, after the filtration operation of the filtration device 31 is stopped, water in the treated water collected in the upper chamber 34 and water flow are stopped. The suspended substance partially separated from the filter element 36 is drained together with the water to be treated in the upper chamber 34. At this time, when a filter aid, for example, a precoated powder resin or the like is used, the separated waste filter aid is also drained together. Thereafter, by introducing high-pressure backwashing air into the lower chamber 35 below the partition plate 33 in which treated water is accumulated, the water is rapidly blown out from the inside of the filter element together with water, and backwashing is performed. In order to perform sufficient washing, this operation including the backwash water supply (water filling) to the lower chamber 35 is repeated several times.
[0007]
On the other hand, in a general backwashing method in the filter element hanging type filtration device 21, after the filtration operation of the filtration device 21 is stopped, high-pressure backwashing air is introduced into the upper chamber 24 where the treated water is collected, and the filtration is performed. In the state where the treated water inlet valve (not shown) provided in the treated water introduction line connected to the lower part of the tower 22 or the backwash water drain valve provided in the drain line is opened, By reversely flowing the filter element 26 at a high flow rate, the suspended substances adhering to the filter element 26 are peeled off and washed. In this case, since the treated water at the upper part of the partition plate 23 is discharged by the first backwashing, the backwashing water connected to the upper chamber 24 is separated from the main body of the filtration device 21 when the backwashing is repeated. A tank is provided, and the backwash water stored in the tank is introduced into the upper chamber 24 with high-pressure air, and the introduced backwash water is backflowed at a high flow rate at a stretch to adhere to the filter element 26. Remove suspended material and wash.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-15364 (Claims)
[0009]
[Problems to be solved by the invention]
However, in the backwashing method of the filter element hanging type filtration device as described above, the cleaning performance at the upper part of the suspended filter element 26 tends to be inferior to the cleaning performance at the lower part. That is, the backwashing water that is backflowed in the filter element 26 at a high flow rate and is discharged into the lower chamber 25 acts more effectively on the lower side than the upper side of the filter element 26, and the upper side cleaning effect is obtained. It tends to be inferior to the lower side. In addition, when such backwashing is repeated in an attempt to sufficiently wash the upper side, there is a problem that a large amount of backwashing wastewater is generated although the washability is improved. Backwash wastewater often requires further solid-liquid separation and sludge concentration and dewatering treatment.For example, backwash wastewater at power plants, especially nuclear power plants, must be treated strictly. When washing wastewater is generated, there is a problem that it takes time and effort for the treatment. Therefore, it is desired to reduce the amount of backwash drainage as much as possible in the backwashing of the filtration device installed in such a place.
[0010]
Therefore, the object of the present invention is to pay attention to such problems, and in the back washing method of the filter element hanging type filtration device, the filter element can be washed uniformly in the upper and lower parts and the washing performance for the entire filter element is improved. An object of the present invention is to provide a backwashing method for a filtration device that is improved and can reduce the amount of backwash wastewater.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the backwashing method of the filtration device according to the present invention suspends the filter element accommodated in the lower chamber on a partition plate that partitions the inside of the filtration tower into an upper chamber and a lower chamber, A backwashing method in a filtration device that drains water to be treated introduced into the lower chamber through a filter element and then discharges it through the upper chamber, and water is applied to a higher position than the lowest part of the filter element in the lower chamber. In the state, backwashing is performed by sending backwash water from the upper chamber to the lower chamber through the filter element , and the water level of water filling into the lower chamber for backwashing is changed for each backwash. It consists of a characteristic method.
[0012]
In this backwashing method of the filtration device, the water level in the lower chamber for backwashing is changed every backwashing . That is, when backwashing is repeated, the water level in the lower chamber immediately before the start of backwashing is changed for each backwash .
[0013]
In addition, on the side of the filtration tower, an openable backwash air vent line (a line equipped with an open / close valve) equipped with a backwash air vent valve is connected to a position corresponding to the upper part of the lower chamber. The line is opened, the drain line connected to the lower part of the filtration tower is closed in principle, and all or part of the backwash wastewater used for backwashing is filled with water for filling the lower chamber for backwashing. It is preferable to do.
[0014]
Although it does not specifically limit as a filter element in the present invention, it is possible to use a pleat type or precoat type or hollow fiber membrane type filter element that is a target of backwashing or that can recover differential pressure performance well by backwashing. it can.
[0015]
Moreover, although the installation location of the filtration device that is the subject of the method of the present invention is not particularly limited, as described above, the power plant requires strict post-treatment of backwash drainage, and particularly reduces the amount of backwash drainage. Since it is required, the present invention is particularly suitable for backwashing a filtration device provided in a power plant.
[0016]
In the backwashing method of the filtration apparatus according to the present invention as described above, during the backwashing process, the lower chamber is not filled with water, and the water is stretched up to the upper part of the lowermost part of the filter element and above the water level. In the state where the air layer is formed, there is provided a step of performing backwashing by sending backwash water from the upper chamber through the filter element to the lower chamber. In this case, since the water stretched in advance becomes a resistance, the amount of permeation of backwash water and air in the filter element portion below the water level, that is, in the filter element portion immersed in the water stretched in advance. Is reduced, and the permeation amount of backwash water and air in the filter element portion at a position corresponding to the air layer is increased, and the cleanability at that portion is improved. Therefore, the tendency for the lower side to be washed more easily and the upper side was less likely to be washed is corrected, and the suspended filter element can be uniformly washed over the entire length, improving the washing performance of the entire filter element. Is done.
[0017]
Further, in the present invention, when the backwashing is repeated a plurality of times by changing the water level of the water filling to the lower chamber for each backwash as described above, the backwash drainage remaining in the lower chamber after the backwash is returned for each backwash. The entire amount may be discharged out of the system, and water for water filling necessary for the next backwashing may be newly introduced into the lower chamber each time. The total amount of backwash wastewater discharged outside the system will increase. Therefore, when backwashing is repeated as described above, the backwash wastewater discharged into the lower chamber by backwashing is not discharged every time out of the system, but the entire amount of backwash wastewater or one of them It is good to leave the part in the lower chamber and use it as water filling water for the next backwashing. For example, on the side of the filtration tower, connect the aforementioned openable line to a position corresponding to the upper part of the lower chamber, open the line during backwashing, and close the drain line connected to the lower part of the filtration tower. By performing the washing, it is possible to leave the whole or part of the backwash drainage used for backwashing in the lower chamber as water filling water into the lower chamber. In this way, by using all or part of the backwash wastewater as water filling water into the lower chamber, the amount of backwash wastewater discharged outside the system as a whole backwash process in which backwash is repeated is greatly reduced. At the same time, the water level in the lower chamber can be raised for each backwash, and the filter element can be washed uniformly in the upper and lower portions.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a filter element-suspended filter device 1 used for carrying out the method according to the present invention together with surrounding piping systems and valves. The inside of the filtration tower 2 is partitioned into an upper chamber 4 and a lower chamber 5 by a partition plate 3 (also referred to as a tube sheet or a fixed plate), and the partition plate 3 includes a plurality of filters housed in the lower chamber 5. The element 6 is suspended and fixed. Although two filter elements 6 are shown in FIG. 1, usually a larger number of filter elements 6 are provided. A treated water introduction line 8 having a treated water inlet valve 7 for introducing treated water and a drain line 10 equipped with a drain valve 9 are connected to the lower chamber 5. The treated water introduction line 8 and the drain line 10 are joined to one line and then connected to the lower chamber 5 of the filtration tower 2. The upper chamber 4 includes a treated water discharge line 12 having a treated water outlet valve 11, a backwash water introduction line 14 having a backwash water introduction valve 13, and a backwash having a backwash air inlet valve 15. A working air introduction line 16 is connected. A backwash water tank 17 for storing backwash water is connected to the backwash water introduction line 14, and the backwash water tank 17 includes a backwash water supply line 18 b including a backwash water supply valve 18 a and A pressurized air feed line 19b provided with a pressurized air feed valve 19a is connected. Further, a backwash air vent line 20 b provided with a backwash air vent valve 20 a is connected to a position corresponding to the upper portion of the lower chamber 5 on the side surface of the filtration tower 2.
[0019]
The backwashing method according to the present invention is performed as shown in FIG. 2, for example, using the filtration device 1 configured as described above.
In the example shown in FIG. 2, the operation is performed in the following order.
(1) Stop filtration operation: The treated water inlet valve 7 and the treated water outlet valve 11 are closed (step (1)). At this time, the inside of the filtration tower 2 is full.
[0020]
(2) Backwash I: The drain valve 9 and the backwash air inlet valve 15 are opened, backwash air is introduced, and the treated water accumulated in the upper chamber 4 of the filtration tower 2 is introduced from the inside of the filter element 6. Blow out rapidly to the outside for cleaning (step (2)). At this time, the entire amount of water in the filtration tower 2 is discharged (blowed) in this example. When the filter element 6 is a precoat type, this rapid and backwashing by discharging the entire amount is effective. In this backwashing, particularly, the vicinity of the lower end of the filter element 6 is washed well.
[0021]
(3) Preparation for backwashing I: Thereafter, the drain valve 9 and the backwashing air inlet valve 15 are closed, the backwashing water supply valve 18a is opened to replenish backwashing water into the backwashing water tank 17 and pressurize. The air supply valve 19a is opened, and pressurized air used in the next backwash water tank 17 is sealed in the backwash water tank 17 (step (3)).
[0022]
(4) Backwash II: The backwash water supply valve 18a and the pressurized air supply valve 19a are closed, the backwash water introduction valve 13 and the backwash air vent valve 20a are opened, and the water is stored in the backwash water tank 17. The backwash water which has been sent is sent to the filter element 6 by the pressurized air sealed in the tank 17 and is quickly blown out from the inside of the filter element 6 for cleaning (step (4)). At this time, since the drain valve 9 is closed, the backwash wastewater blown out from the inside of the filter element 6 is stored in the lower chamber 5 and the inside of the lower chamber 5 is filled with water. As shown in the drawing, the water level of the water filling is set to a level slightly higher than the lower end of the filter element 6, and the filter element portion on the lower side is kept immersed in the water stored in the lower chamber 5. . Further, due to water filling, the air in the lower chamber 5 is discharged to the outside through the backwash air vent valve 20a (side vent). At the time of this backwashing, since the part near the lower end of the filter element 6 is soaked in water from the middle, the resistance in the soaked part is increased and the part higher than the water-filled water level. Will be backwashed more effectively.
[0023]
(5) Backwash preparation II: When backwashing is repeated, the backwash water introduction valve 13 and the backwash air vent valve 20a are closed, and the backwash water supply valve 18a is opened again to back into the backwash water tank 17. The washing water is replenished, and the pressurized air feed valve 19a is opened to fill the backwashing water tank 17 with pressurized air used for the next backwashing (step (5)).
[0024]
(6) Backwash III: Similar to backwash II, backwash water replenishment valve 18a and pressurized air supply valve 19a are closed, backwash water introduction valve 13 and backwash air vent valve 20a are opened, and backwash is performed. The backwash water stored in the water tank 17 is sent to the filter element 6 by the pressurized air sealed in the tank 17 and rapidly blown out from the inside of the filter element 6 to be washed (step ▲ 6 ▼). The backwash waste water blown out from the inside of the filter element 6 is stored in the lower chamber 5, the interior of the lower chamber 5 is filled with water, and the water level of the water filling is further raised as shown in the figure. In this backwashing, the water-immersed portion of the filter element 6 is further increased as compared with the backwashing II, so that the upper filter element portion is more effectively backwashed than the backwashing II.
[0025]
(7) Backwash preparation III: When backwashing is repeated, the backwash water introduction valve 13 and the backwash air vent valve 20a are closed and the backwash water supply valve 18a is opened again in the same manner as the backwash preparation II. The backwash water tank 17 is replenished with backwash water, and the pressurized air feed valve 19a is opened to fill the backwash water tank 17 with pressurized air for use in the next backwash (step 7). ▼).
[0026]
(8) Backwash IV: As with backwash III, backwash water replenishment valve 18a and pressurized air supply valve 19a are closed, backwash water introduction valve 13 and backwash air vent valve 20a are opened, and backwash is performed. The backwash water stored in the water tank 17 is sent to the filter element 6 by the pressurized air sealed in the tank 17 and rapidly blown out from the inside of the filter element 6 to be washed (step ▲ 8 ▼). The backwash waste water blown out from the inside of the filter element 6 is stored in the lower chamber 5, the interior of the lower chamber 5 is filled with water, and the water level of the water filling is further raised as shown in the figure. In this backwashing, the water-immersed portion of the filter element 6 is further increased as compared with the backwashing III, so that the upper filter element portion is more effectively backwashed than the backwashing III.
[0027]
Thus, the predetermined number of backwash preparations and backwashes are repeated, and when the predetermined number of backwashes are completed, all the backwash drainage in the filtration tower 2 is drained, and then the inside of the filtration tower 2 is filled with water. Wait until the filtration operation.
[0028]
In the backwashing method of the filtration device 1 as described above, the backwashing is carried out in a state where water is filled in the lower chamber 5 and an air layer is formed above the water level during the backwashing process. The amount of permeation of backwashing water and air in the filter element portion below the water level is reduced, and the amount of backwashing water and air permeation in the filter element portion located at the position corresponding to the air layer is increased, The detergency at the site is improved. By increasing the water filling level at each backwash step, the tendency that the lower side is easier to wash and the upper side is less likely to be washed is corrected, and the suspended filter element 6 is washed uniformly over the entire length. This makes it possible to improve the cleaning performance of the filter element 6 as a whole.
[0029]
Further, in the backwashing method according to the present invention as described above, the whole or part of the water used for backwashing the filter element 6 is contained in the lower chamber 5 as water filling water into the lower chamber for backwashing. When all the water used for backwashing is drained out of the system from the lower chamber 5 and backwashing is performed by newly introducing a predetermined amount of water filling water into the lower chamber 5 at the next backwashing. In comparison with the above, the amount of backwash drainage discharged out of the system as a whole backwash process in which backwash is repeatedly performed is greatly reduced.
[0030]
In order to confirm the detergency of the filter element by the backwashing method according to the present invention, the following water flow test was performed.
〔Test method〕
Using a filter element water flow test apparatus in which two columns (column A and column B) were installed, each column was filled with a pleated filter element in a “hanging type” and adjusted to an iron clad concentration of 100 μg / L. Test water was passed. In this water flow test, when 10 g of iron clad per 1 m 2 of filter element membrane area was captured, water flow was stopped and backwashing was performed. Thereafter, water flow and backwashing were performed under the same conditions. And backwashing as one cycle, a total of 10 cycles were repeated. In addition, 5 backwashes were performed during one water flow stop period.
[0031]
The backwashing method uses a method in which pure water is filled in a backwashing water tank connected to the column upper chamber, and the backwashing water is caused to flow back to the filter element by introducing high-pressure air. In the A column, the back drain operation is performed without storing the water for backwashing in the lower column of the column, with the lower drain valve kept open for all 5 times. On the other hand, in the B column, the lower drain valve is opened in the first backwash and the entire backwash water is discharged, but the side vent valve (the above-mentioned backwash air vent valve) is opened and the backwash water is used in the second and subsequent times. The total amount or a part of was stored in the column lower chamber, and the backwashing was performed after adjusting the amount of water filling in the column lower chamber (adjusted so that the water level of the stored water gradually increased).
[0032]
Further, after the end of 10 cycles, the filter membranes of column A and column B were sampled from the upper part, middle part and lower part, respectively, and the amount of attached iron was measured. The transition of the initial differential pressure of water flow in columns A and B in each cycle is shown in FIG. Moreover, about the filter element of column A and column B, the filtration membrane adhesion iron amount measurement result of each site | part is shown in Table 1. In Table 1, the amount of filtration membrane adhering at each part is shown as a ratio when the amount of iron adhering to the upper portion of the filtration membrane of the A column is 1.0.
[0033]
[Table 1]
[0034]
From FIG. 3, the initial differential pressure of water flow in column A showed an increasing tendency with each cycle, but the initial differential pressure of water flow in column B remained stable with a low value. Also, from Table 1, in column A, the amount of adhering iron (remaining amount after backwashing of adhering iron) was higher on the upper side of the filter element, but in column B, the amount of adhering iron in the filter element length direction (vertical direction) It became uniform and the total amount of iron adhered was less than that of column A. From these facts, it was confirmed that the washability of the filter element was greatly improved by filling the column lower chamber with water during backwashing and adjusting the amount of water filling.
[0035]
【The invention's effect】
As described above, according to the backwashing method of the filtration device according to the present invention, the backwashing is performed in a state where water is stretched up to a predetermined water level in the filtration tower, so that the filter element is uniform in the length direction. In addition, it is possible to improve the cleaning performance as a whole.
[0036]
In particular, when backwashing is repeated, the amount of backwashing wastewater used for backwashing can be significantly reduced by leaving all or part of the backwashing wastewater in the lower chamber as water filling water. It becomes possible. Therefore, it is possible to significantly reduce the backwash wastewater treatment load, particularly for backwashing of the filtration device in a nuclear power plant.
[Brief description of the drawings]
FIG. 1 is a piping system diagram of a filtration device used for carrying out a method according to the present invention.
FIG. 2 is a process flow chart showing an example of the operation order of the backwashing method for the filtration device according to the present invention.
FIG. 3 is a differential pressure recovery characteristic diagram of a test conducted to confirm the effect of the backwashing method of the filtration device according to the present invention.
FIG. 4 is a schematic configuration diagram of a filter element hanging type filtration apparatus to which the method of the present invention is applied.
FIG. 5 is a schematic configuration diagram of a filter element lower fixed filter device that is not applied to the present invention and is shown for comparison.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration apparatus 2 Filtration tower 3 Partition plate 4 Upper chamber 5 Lower chamber 6 Filter element 7 To-be-treated water inlet valve 8 To-be-treated water introduction line 9 Drain valve 10 Drain line 11 Treated water outlet valve 12 Treated water discharge line 13 Backwash water Introduction valve 14 Backwash water introduction line 15 Backwash air inlet valve 16 Backwash air introduction line 17 Backwash water tank 18a Backwash water supply valve 18b Backwash water supply line 19a Pressurized air supply valve 19b Pressurized air Supply line 20a Backwash air vent valve 20b Backwash air vent line

Claims (4)

  1. A filter element housed in the lower chamber is suspended on a partition plate that divides the inside of the filtration tower into an upper chamber and a lower chamber, and water to be treated introduced into the lower chamber is filtered by the filter element, and then the upper chamber A backwashing method in a filtration device that discharges through the water, and backwashing water is sent from the upper chamber to the lower chamber through the filter element in a state where water is stretched up to a position higher than the lowermost portion of the filter element in the lower chamber. A backwashing method for a filtration device, characterized in that backwashing is performed and the water level in the lower chamber for backwashing is changed for each backwashing.
  2. An openable backwash air vent line equipped with a backwash air vent valve is connected to a position corresponding to the upper part of the lower chamber on the side of the filter tower, and the line is opened at the time of backwash. to the connected drain line as principle closed, all or a portion of the backwash waste water used for backwashing the water filling water into the lower chamber for the time the backwash of the filtering apparatus of claim 1 Backwash method.
  3. The method for backwashing a filtration device according to claim 1 or 2 , wherein a pleat type, precoat type, or hollow fiber membrane type filter element is used as the filter element.
  4. The backwashing method of the filtration apparatus in any one of Claims 1-3 which backwash the filtration apparatus provided in the power station.
JP2003021857A 2003-01-30 2003-01-30 Filtration device backwash method Active JP4042967B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003021857A JP4042967B2 (en) 2003-01-30 2003-01-30 Filtration device backwash method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003021857A JP4042967B2 (en) 2003-01-30 2003-01-30 Filtration device backwash method

Publications (2)

Publication Number Publication Date
JP2004230287A JP2004230287A (en) 2004-08-19
JP4042967B2 true JP4042967B2 (en) 2008-02-06

Family

ID=32951079

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003021857A Active JP4042967B2 (en) 2003-01-30 2003-01-30 Filtration device backwash method

Country Status (1)

Country Link
JP (1) JP4042967B2 (en)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPR421501A0 (en) 2001-04-04 2001-05-03 U.S. Filter Wastewater Group, Inc. Potting method
AUPR692401A0 (en) 2001-08-09 2001-08-30 U.S. Filter Wastewater Group, Inc. Method of cleaning membrane modules
AUPS300602A0 (en) 2002-06-18 2002-07-11 U.S. Filter Wastewater Group, Inc. Methods of minimising the effect of integrity loss in hollow fibre membrane modules
KR101115173B1 (en) 2003-08-29 2012-02-24 지멘스 워터 테크놀로지스 코포레이션 Backwash
KR20070003783A (en) 2003-11-14 2007-01-05 유.에스. 필터 웨이스트워터 그룹, 인크. Improved module cleaning method
WO2005092799A1 (en) 2004-03-26 2005-10-06 U.S. Filter Wastewater Group, Inc. Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis
NZ553596A (en) 2004-09-07 2010-10-29 Siemens Water Tech Corp Reduction of backwash liquid waste
EP1799334B1 (en) 2004-09-14 2013-12-11 Siemens Water Technologies LLC Methods and apparatus for removing solids from a membrane module
JP4954880B2 (en) 2004-09-15 2012-06-20 シーメンス・ウォーター・テクノロジーズ・コーポレーション Continuously changing ventilation
AT549076T (en) 2004-12-24 2012-03-15 Siemens Industry Inc Cleaning in membrane filtration systems
US8758622B2 (en) 2004-12-24 2014-06-24 Evoqua Water Technologies Llc Simple gas scouring method and apparatus
NZ562786A (en) 2005-04-29 2010-10-29 Siemens Water Tech Corp Chemical clean for membrane filter
WO2007022576A1 (en) 2005-08-22 2007-03-01 Siemens Water Technologies Corp. An assembly for water filtration using a tube manifold to minimise backwash
WO2008051546A2 (en) 2006-10-24 2008-05-02 Siemens Water Technologies Corp. Infiltration/inflow control for membrane bioreactor
US8318028B2 (en) 2007-04-02 2012-11-27 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
US9764288B2 (en) 2007-04-04 2017-09-19 Evoqua Water Technologies Llc Membrane module protection
WO2008153818A1 (en) 2007-05-29 2008-12-18 Siemens Water Technologies Corp. Membrane cleaning with pulsed airlift pump
CN102112213B (en) 2008-07-24 2016-08-03 伊沃夸水处理技术有限责任公司 Frame system for film filter module
AU2010101488B4 (en) 2009-06-11 2013-05-02 Evoqua Water Technologies Llc Methods for cleaning a porous polymeric membrane and a kit for cleaning a porous polymeric membrane
EP2563501B1 (en) 2010-04-30 2019-05-15 Evoqua Water Technologies LLC Fluid flow distribution device
AU2011305377B2 (en) 2010-09-24 2014-11-20 Evoqua Water Technologies Llc Fluid control manifold for membrane filtration system
CN102861469A (en) * 2011-07-06 2013-01-09 镇江市科能电力设备有限公司 Filtering device
EP2763776A4 (en) 2011-09-30 2015-07-01 Evoqua Water Technologies Llc Improved manifold arrangement
EP2760567A4 (en) 2011-09-30 2015-10-14 Evoqua Water Technologies Llc Isolation valve
KR20150024409A (en) 2012-06-28 2015-03-06 에보쿠아 워터 테크놀로지스 엘엘씨 A potting method
AU2013231145B2 (en) 2012-09-26 2017-08-17 Evoqua Water Technologies Llc Membrane potting methods
AU2013324056B2 (en) 2012-09-26 2017-11-16 Evoqua Water Technologies Llc Membrane securement device
AU2013323934A1 (en) 2012-09-27 2015-02-26 Evoqua Water Technologies Llc Gas scouring apparatus for immersed membranes
AU2014329869B2 (en) 2013-10-02 2018-06-14 Evoqua Water Technologies Llc A method and device for repairing a membrane filtration module
US10322375B2 (en) 2015-07-14 2019-06-18 Evoqua Water Technologies Llc Aeration device for filtration system

Also Published As

Publication number Publication date
JP2004230287A (en) 2004-08-19

Similar Documents

Publication Publication Date Title
AU776211B2 (en) Immersed membrane filtration system and overflow process
AU2004289373B2 (en) Improved module cleaning method
JP3302992B2 (en) Concentration of solids in suspension using a hollow fiber membrane
AU2004273534B2 (en) Improved methods of cleaning membrane modules
KR100453845B1 (en) Method for cleaning an immersed-membrane filtration apparatus
CA2460207C (en) High solids module
US8790515B2 (en) Reduction of backwash liquid waste
US8506806B2 (en) Methods and apparatus for removing solids from a membrane module
JP2004536710A (en) Membrane module cleaning method
DE69924642T2 (en) Water filtration by underwater membranes
JP2007503972A (en) Backwash
US6402956B1 (en) Treatment system and treatment method employing spiral wound type membrane module
US5209852A (en) Process for scrubbing porous hollow fiber membranes in hollow fiber membrane module
US5066402A (en) Method of changing operating modes in automatic water filtering apparatus using tubular membranes
ES2316986T3 (en) Apparatus and procedure for the treatment of an injection fluid.
US20100237014A1 (en) Membrane module with multiple bottom headers and filtration process
DE69532129T2 (en) Cleaning of hollow fiber membranes
CA2501628C (en) A filtration and backwashing arrangement for membrane modules
US6893568B1 (en) Immersed membrane filtration system and overflow process
US20060065596A1 (en) Membrane filter cleansing process
AU2007291946B2 (en) Low pressure backwash
JP3273665B2 (en) The hollow fiber membrane filtration apparatus and its cleaning method
US20050194315A1 (en) Membrane batch filtration process
US20070051679A1 (en) Water filtration using immersed membranes
JPH05137909A (en) Backwash method and apparatus

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050817

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070913

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070921

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20071019

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20071109

R150 Certificate of patent or registration of utility model

Ref document number: 4042967

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071109

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101122

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121122

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121122

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131122

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250