Source: https://patents.google.com/patent/JP3652557B2/en
Timestamp: 2020-02-20 04:54:23
Document Index: 736808387

Matched Legal Cases: ['art 22', 'art 22', 'art 22', 'art 24', 'art 24', 'art 24', 'art, 24']

JP3652557B2 - Filtration equipment backwash method - Google Patents
Filtration equipment backwash method Download PDF
JP3652557B2
JP3652557B2 JP22010899A JP22010899A JP3652557B2 JP 3652557 B2 JP3652557 B2 JP 3652557B2 JP 22010899 A JP22010899 A JP 22010899A JP 22010899 A JP22010899 A JP 22010899A JP 3652557 B2 JP3652557 B2 JP 3652557B2
JP22010899A
JP2001038107A (en
友明 宮ノ下
邦雄 海老江
1999-08-03 Application filed by オルガノ株式会社 filed Critical オルガノ株式会社
1999-08-03 Priority to JP22010899A priority Critical patent/JP3652557B2/en
2001-02-13 Publication of JP2001038107A publication Critical patent/JP2001038107A/en
2005-05-25 Publication of JP3652557B2 publication Critical patent/JP3652557B2/en
The present invention is a filtration apparatus for performing a filtration process in downflow relates to backwash method definitive in particular those having a plurality of filtration layers.
Filtration equipment is often used to separate suspended substances in the production of purified water and industrial water using river water as raw water, and wastewater treatment, and activated carbon adsorption equipment is often used to remove dissolved components. The In addition, sand is the most common filter medium used in filtration devices, but two-layer filtration using a two-layer filtration layer of sand and anthracite is also known, and activated carbon was installed on the top of the sand layer. There is also an activated carbon / sand filter.
However, in the two-layer filtration device with anthracite layer and the activated carbon / sand filtration device with activated carbon installed on the top of the sand layer, the anthracite and activated carbon are light in specific gravity, so it easily flows out together with the washing waste water during backwashing. . Therefore, there are problems that the cleaning conditions are limited and the particle size and specific gravity of the filter medium are regulated, and sufficient cleaning cannot be performed.
On the other hand, for example, in a gravity-type filtration device, an effective water head of about 2000 mm to 3000 mm is secured in consideration of a loss head in the filtration layer. Not all of this free board is necessary. For example, in a filtration device having an effective head of 2500 mm, when the head of loss reaches about 2000 mm, turbidity will flow into the filtered water. Therefore, it is necessary to clean the filtration device when the head loss is 2000 mm. In other words, the actual water head used may be 2000 mm, and the remaining 500 mm is an extra volume prepared for safety, which can be said to be substantially unnecessary. Therefore, there is a demand for effective use of such a surplus volume.
This invention is made | formed in view of the said subject, the reverse of the filtration apparatus which can arrange | position a 2nd filtration layer effectively using the surplus volume in a filtration apparatus, and can perform the washing | cleaning of a filter medium effectively. The purpose is to provide a washing method .
Filtration apparatus according to the present invention is a filtration KaSo location to perform filtering processing in downflow, the first filter material is filled, the first filtration layer separating the suspended solids from the water to be treated passes, the A second filtration layer that is disposed above the first filtration layer and spaced apart from the surface of the first filtration layer and is filled with a second filter medium having a particle size larger than that of the first filtration medium, and a second filtration layer of the second filtration layer. And a support for supporting the filter medium .
Thus, since the 2nd filtration layer was spaced apart and arrange | positioned on the 1st filtration layer, in this 2nd filtration layer, the process independent of the 1st filtration layer can be performed and a more advanced process can be performed. In particular, the second filter medium of the second filtration layer has a larger particle size than the first filter medium of the first filtration layer. Therefore, the loss head in the second filtration layer is not so large. On the other hand, in the filtration apparatus, the loss head in the filtration layer is afforded. Therefore, even if the second filtration layer is added to the filtration device using only the first filtration layer, there is often no need to change the size of the entire filtration device. Therefore, more advanced processing can be achieved by effectively utilizing the surplus volume. Further, even when a loss head is generated in the second filtration layer, the load on the first filtration layer is reduced accordingly, so that the thickness of the first filtration layer can be reduced accordingly, and the overall volume does not change much. .
Furthermore, since the 2nd filtration layer was hold | maintained by the support body, an additional process can be performed in a 2nd filtration layer, maintaining water permeability. In addition, even when the first filtration layer is backwashed at a high linear velocity, the filter medium of the second filtration layer can be held by the support and the outflow of the filter medium can be prevented.
The second filter medium of the second filtration layer is preferably granular activated carbon. Adsorption treatment can be performed with activated carbon, and more advanced treatment can be performed. In particular, activated carbon has a main purpose of adsorbing and removing soluble organic substances, and particles having coarse particles can be used. For this reason, the loss head here can be made very small. Therefore, the second filtration layer is positioned without changing the overall size of the filtration device by positioning the second filtration layer in the water to be treated existing on the first filtration layer in order to generate the filtration pressure for the first filtration layer. Can be provided.
And the backwashing method of the filtration device concerning the present invention has an intermediate discharge pipe which discharges backwash drainage about the 1st filtration layer in the middle part of the 1st filtration layer and the 2nd filtration layer , The backwashing method supplies backwashing water from below the first filtration layer, allows the backwashing water to pass through the first filtration layer and the second filtration layer, and sets the expansion rate of the second filtration layer to 20 at this time. After the 2nd filtration layer water backwashing process which wash | cleans a 2nd filtration layer as -50%, and this 2nd filtration layer water backwashing process, air is sent from the downward direction of a 1st filtration layer, and 1st filtration layer is air After backwashing the first filtration layer air backwashing step and this first filtration layer air backwashing step, backwashing water is supplied from below the first filtration layer, and a part of the backwashing water from the intermediate drain pipe Or the 1st filtration layer water backwashing process which discharges | emits all out of the system and backwashes a 1st filtration layer with water is characterized by the above-mentioned.
In addition, it is preferable that the second filtration layer is configured by detachably arranging a plurality of activated carbon cartridges supported by individual supports on a frame member. Thereby, replacement | exchange of the filter medium of a 2nd filtration layer can be performed easily. In particular, when an adsorbent such as activated carbon is used as the filter medium for the second filtration layer, it must be periodically replaced, but this structure facilitates replacement.
FIG. 1 is a diagram showing the overall configuration of the coagulation / separation apparatus according to the present embodiment. Raw water such as river water and lake water is first introduced into the mixing tank 10. The mixing tank 10 is supplied with the flocculant from the flocculant storage tank 12 by the flocculant pump 14. The flocculant is preferably an inorganic aluminum flocculant such as PAC, but may be other flocculants. The mixing tank 10 is provided with a stirrer 16 so that the raw water and the flocculant are rapidly stirred. In this mixing tank 10, the coagulant-mixed water in which the coagulant is mixed flows into the coagulation tank 18. A slow stirrer 20 is disposed in the coagulation tank 18, and the coagulant admixture water is slowly stirred to coalesce and coarsen the coagulation flocs.
Next, the coagulant-mixed water after slow stirring from the coagulation tank 18 flows into the inclined plate settling tank 22. The inclined plate settling tank 22 is divided into an inlet side and an outlet side by a partition plate 22a, and a settling portion 22b having a deep tank depth is formed on the inlet side. And the lower part of this sedimentation part 22b is the sludge storage part 22c which stores sedimentation sludge. A large number of inclined plates 22d are arranged on the outlet side to form inclined plate precipitation portions 22e. The flocculant-mixed water flows into the sedimentation portion 22b, where it is subjected to sedimentation treatment, and then passes under the partition plate 22a and passes upward through the inclined plate sedimentation portion 22e. Then, when passing through the inclined plate 22d of the inclined plate settling portion 22e, further precipitation processing is performed, and sludge is precipitated toward the tank bottom. Since the tank bottom of the inclined plate settling portion 22e is inclined deeper toward the sludge storage portion 22c, the settling sludge moves to the sludge storage portion 22c by gravity. Then, the supernatant that has passed through the inclined plate settling portion 22e is discharged from the inclined plate settling tank 22. In addition, the sludge settled in the sludge storage part 22c of the inclined plate sedimentation tank 22 is suitably extracted and disposed of separately.
By such a coagulation sedimentation process, a considerable part of the suspended solids is removed from the sedimentation water from the inclined plate sedimentation tank 22. This precipitated treated water flows into the filtering device 24. Depending on circumstances, additional flocculant injection or flocculant auxiliary agent may be injected, stirred by a line mixer, and supplied to the filtration device 24.
The filtration device 24 is a gravity-type filtration device having two filtration layers, a second filtration layer 24b and a first filtration layer 24a. And the 2nd filtration layer 24b is located in the upper part spaced apart from the surface of the 1st filtration layer 24a. And the support net | network 24c as a support body is provided above and below this 2nd filtration layer 24b, and the 2nd filtration layer 24b is supported in the said position. The filtration device 24 may be a pressure type rapid filtration device.
Here, the 2nd filter medium utilized as the filter medium of the 2nd filtration layer 24b is granular activated carbon, and the particle size is about 0.9-1.6 mm. Moreover, the 1st filter medium of the 1st filtration layer 24a is sand, The particle size is about 0.45-0.8 mm, and a particle | grain is finer than the activated carbon of the 2nd filtration layer 24b. In addition, about the 1st filter medium of the 1st filtration layer 24a, it replaces with sand and it is also suitable to use a garnet etc. or to make sand and a garnet into a multilayer. Anthracite can also be used for the second filter medium of the second filtration layer 24b. Further, a basket or the like can be used instead of the support net. That is, the support in the present invention may be any support as long as the second filtration layer 24b can be held in a predetermined position and water can be circulated.
And the filtered water of this filtration apparatus 24 is stored in the treated water tank 26, and is distributed.
Moreover, you may perform an ozone process in the front | former stage of the filtration apparatus 24 after a precipitation process. When ozone treatment is not performed, chlorine (sodium hypochlorite, etc.) is injected into the mixing tank 10, one or more locations between the second filtration layer 24b and the first filtration layer 24a, and the outlet of the filtration device 24. It is preferable to carry out with.
The treated water in the treated water tank 26 can be supplied to the bottom of the filtration device 24 by the backwash pump 28. Thereby, treated water is supplied to the filtration device 24 in an upward flow, and the first filtration layer 24a and the second filtration layer 24b in the filtration device 24 can be backwashed.
Here, in the filtration apparatus 24 of this embodiment, the 2nd filtration layer 24b is spaced apart from the surface of the 1st filtration layer 24a above the 1st filtration layer 24a. Moreover, the backwash waste water can be discharged from the middle between the first filtration layer 24a and the second filtration layer 24b.
Next, a specific configuration of the filtration device 24 will be described with reference to FIG. As described above, the support member 24e, the support gravel layer 24f, and the first filtration layer 24a are arranged from the bottom inside the filtration device main body 24d. And the 2nd filtration layer 24b is formed on the surface of this 1st filtration layer 24a via the intermediate part 24g. Further, an intermediate discharge pipe 24h communicating with a water collecting trough or the like is connected to the intermediate part 24g.
In the figure, A indicates the surface position of the first filtration layer 24a during water flow (during filtration treatment), and B indicates the surface position of the first filtration layer 24a during backwashing. . In this way, the first filtration layer 24a expands and the surface position rises by backwashing. However, the lower end position of the second filtration layer 24b is above the position indicated by B, and the sand basically does not reach the second filtration layer 24b.
Further, C in the figure represents the surface position of the second filtration layer 24b during water passage (at the time of filtration), and is located below the upper support net 24c. Therefore, the filter medium of the second filtration layer 24b can be flowed during backwashing.
In this example, the second filtration layer 24 b is configured by a plurality of cartridges 30. As shown in FIG. 3, the cartridge 30 is composed of a net cage material 32 as a support, and a granular activated carbon 34 is accommodated therein.
As described above, the granular activated carbon 34 is not fully packed in the mesh basket 32, and a marginal space is formed in the upper part. This extra space is set so that the second filter medium (activated carbon) is not pressed upward by the backwash water and flows sufficiently during backwashing of the second filtration layer 24b.
Further, the cartridge 30 is provided with a portion 36, and the cartridge 30 can be detachable using the portion 36.
Then, as shown in FIG. 4, the cartridge 30 is placed on the frame member 40, whereby the second filtration layer 24b is configured. FIG. 4A shows a case where the filtering device main body 24d is square, and FIG. 4B shows a case where it is circular. In the figure, only the outermost part of the frame member 40 is shown, but a lattice-like frame member is arranged inward so as to hold the cartridge.
With such a configuration, the cartridge 30 can be removed from the frame member 40 and replaced as necessary. The frame member 40 is fixed to the filtration device main body 24d, and the position of the second filtration layer 24b is determined by the position of the frame member 40. In addition, it is preferable that the frame member 40 is detachable, and it is possible to replace the sand of the first filtration layer 24a by removing the frame member 40 during maintenance.
Further, as shown in FIG. 2, the filtration device 24 is provided with an intermediate discharge pipe 24h communicating with the intermediate portion 24g between the first filtration layer 24a and the second filtration layer 24b. Therefore, at the time of backwashing, the backwash wastewater before passing through the first filtration layer 24a from the intermediate discharge pipe 24h and reaching the second filtration layer 24b is discharged from here.
Thus, in the filtration apparatus 24 of this embodiment, it has the 2nd filtration layer 24b above the 1st filtration layer 24a. Therefore, in addition to the normal filtration through the first filtration layer 24a, an adsorption treatment or the like in the second filtration layer 24b is performed. As a result, the removal rate of soluble organic substances and the like can be increased, and more advanced treated water can be obtained.
Further, the second filtration layer 24b is coarser than the first filtration layer 24a, and there is almost no increase in loss head due to the provision of the second filtration layer 24b. Therefore, in the filtration apparatus 24, it can arrange | position to the space of the allowance on the filtration layer which it has originally. In particular, in the case of a gravity-type filtration device, the water to be treated is stored on the filtration layer in an amount corresponding to the loss head , and the entire filtration device is arranged by arranging the second filtration layer 24b in the marginal space. The second filtration layer 24b can be added without changing the size of. Thereby, it is possible to perform more advanced treatment mainly by the adsorption treatment of the soluble organic matter by the second filtration layer 24b. In addition, if the thing of a comparatively small particle size (however, a particle size is larger than the filter medium of the 1st filtration layer 24a) is used as a filter medium of the 2nd filtration layer 24b, in this 2nd filtration layer 24b, the 1st filtration layer 24a. A filtration treatment as a pretreatment can be performed. In this case, it is necessary to allow a certain amount of water loss in the second filtration layer 24b. However, in this case, since the thickness of the first filtration layer 24a can be reduced, the size of the filtration device 24 as a total does not change much.
In addition, a filter medium having no adsorption capability such as anthracite can be used as the filter medium of the second filtration layer 24b. In this case, the filtration process as the pretreatment as described above is performed here.
As the water flow continues, the suspended matter trapped in the filtration layer (especially the first filtration layer 24a) gradually increases and the filter medium saturates, and the filtration device 24 captures more suspended matter. become unable. This can be confirmed by an increase in filtration resistance, an increase in treated water turbidity, and the like. However, the filter medium is usually regenerated by washing before the filter medium is completely saturated.
The filter medium is washed by back washing in which the backwash pump 28 is driven to flow back the treated water. Here, the second filtration layer 24b has a low specific gravity of the filter medium including the case where the anthracite is filled therein. Therefore, when the second filtration layer 24b is directly placed on the first filtration layer 24a and backwashed at a flow rate at which the first filtration layer 24a is sufficiently fluidly washed, the filter medium of the second filtration layer 24b is filtered. It ’s hard to stay inside. On the other hand, when the filter medium of the second filtration layer 24b is held by the net cage material 32, the filter medium can be prevented from flowing out. However, the filter medium of the second filtration layer 24b is pressed against the upper part of the support net 24c (the net basket material 32) by the flow of backwash water, and cannot flow and cannot be washed sufficiently.
In this embodiment, part or all of the backwash water that has passed through the first filtration layer 24a is discharged out of the system by the intermediate discharge pipe 24h connected to the intermediate portion 24g. Therefore, the linear velocity of the backwash water for the first filtration layer 24a and the linear velocity of the second filtration layer 24b can be determined independently. Therefore, the linear velocity of the backwash water for the first filtration layer 24a is set such that the first filtration layer 24a can be sufficiently fluidly washed, and the linear velocity of the backwash water for the second filtration layer 24b is set to the second filtration layer. The linear velocity at which the filter medium 24b flows sufficiently without being pressed against the upper portion of the support net 24c can be achieved. Thereby, it is possible to perform sufficiently effective backwashing for both the first filtration layer 24a and the second filtration layer 24b.
The timing of cleaning is performed by setting a timer based on empirically obtained time or setting a filtration resistance by a differential pressure gauge. In normal rapid filtration apparatus cleaning, it is also preferable to combine surface cleaning or air cleaning with backflow water cleaning using filtered water or backflow water cleaning.
In addition, backwashing of the second filtration layer 24b and backwashing of the first filtration layer 24a can be sequentially performed, and both layers can be fluidized in order to perform backwashing. In this case, an intermediate discharge pipe 24h is used. You don't have to. Further, the backwash water may be introduced into the intermediate portion 24g so that the backwash water to the second filtration layer 24b can be supplied completely independently.
Thus, according to the present embodiment, the support net 24c (the net cage material 32) is provided at least above and below the second filtration layer (the filter medium may be anthracite instead of activated carbon) 24b. Thereby, the 2nd filtration layer 24b can be supported independently above the 1st filtration layer 24a. The distance between the upper and lower meshes of the support mesh 24c was 1.1 to 2.0 times (actually 1.2 to 1.5 times) the layer height of the second filtration layer 24b during water flow. Thereby, the expansion flow at the time of backwashing the second filtration layer 24b can be made sufficient. Further, the second filtration layer 24b has a cartridge structure. As a result, the activated carbon used as the adsorbent can be easily replaced.
Furthermore, a space (intermediate part 24g) was provided between the second filtration layer 24b and the first filtration layer 24a, and the backwash waste water of the first filtration layer 24a could be taken out therefrom. Accordingly, the second filtration layer 24b and the first filtration layer 24a can be washed independently, and the second filtration layer 24b and the first filtration layer 24a can be washed at different flow rates. Therefore, the second filtration layer 24b and the first filtration layer 24a can be sufficiently washed.
Experiments were performed using the apparatus of FIG.
"Experimental conditions"
・ Raw water flow rate: 23.6m 3 / d
・ Mixing tank: Residence time 4 minutes, G value 250 ~ 400s -1
・ Sedimentation tank: sedimentation basin with an upflow type inclined plate, residence time 40 minutes, rising speed 5 cm / min
-Filter specifications: φ500mm x H4000mm (filtration area 0.196m 2 ), filter layer height 400mm
・ Filtration speed (LV): 5m / h (120m / d)
-Filter media: Silica sand Specific gravity 2.5, Effective diameter 0.6mm, Uniformity factor 1.4
・ Second filter medium (activated carbon): Coal specific gravity 1.1, average diameter 1.8mm, uniformity coefficient 1.6, bed height 400mm
・ Second filtration layer support net: Stainless steel, 1.5mm mesh
・ Water flow time: 48 hours (Washing starts with a timer)
-Raw water turbidity: 8-30 degrees-Raw water pH: 7.5-8.2
・ Flocculant: PAC10 ~ 30mg / l
・ Target treatment water turbidity: Less than 0.1 degree “Experimental results”
Add 10 mg / L of PAC as a flocculant to raw water with a turbidity of 8 degrees, add sulfuric acid as an acid to adjust the pH to 7.0, and mix in a mixing tank 10 using a rapid stirrer. The mixture was gently stirred at 18 and subjected to precipitation in a precipitation tank 22 with an inclined plate. And this treated water was filtered with the filtration device 24 to obtain treated water.
Moreover, if the filtration apparatus 24 performs water flow to some extent, the gap between the activated carbon and the sand filter medium is saturated due to the turbidity, and the water flow cannot be continued. This appears in the form of increased filtration resistance and turbidity spillage into the filtered water. The time until the filtration cannot be continued depends on the turbidity concentration in the inflow water of the filtration device, the water flow rate, and the like, and is usually about 24 to 72 hours. In this example, backwashing was performed every 48 hours.
In this backwashing, first, (i) in order to wash the second filtration layer 24b, backwashing was performed by LV = 27 m / h × 5 minutes. The expansion coefficient of the activated carbon at this time was about 40%. In addition, 20-50% is suitable for the expansion rate at the time of washing | cleaning. As a result, the second filtration layer 24b is cleaned. Next, (ii) the first filtration layer 24a was washed with air at LV = 40 m / h × 3 minutes, and the first filtration layer 24a was backwashed with water at LV = 37 m / h × 4 minutes. In this case, with respect to the cleaning of the first filtration layer 24a, the cleaning drainage is discharged from the intermediate discharge pipe 24h below the second filtration layer 24b, so the first filtration layer 24a is cleaned. In this case, the entire amount of the washing waste water is pulled out from the intermediate discharge pipe 24h, but a part thereof may be pulled out.
The treated water quality is shown in Table 1.
Thus, the removal and turbidity of DOC (dissolved organic carbon) are performed by the second filtration layer (activated carbon layer) 24b, and the final turbidity treatment is performed by the first filtration layer (sand layer) 24a. I understand. In general, in an activated carbon treatment facility, the activated carbon layer is installed so that the height of the activated carbon layer is 1000 to 3000 mm and SV = 5 to 15 h −1. The second filtration layer (activated carbon layer) 24b may have a layer height of 300 to 500 mm and SV = 10 to 15 h −1 . In this experiment, 5 m / h ÷ 0.4 m = 12.5 h −1 was set. Further, the thickness of the sand layer is generally 600 to 700 mm, but in this case, since the activated carbon layer also serves as a filter medium, it is sufficient if the first filtration layer (sand layer) 24a is about 300 mm.
As described above, according to the present invention, since the second filtration layer is arranged on the first filtration layer so as to be separated, the second filtration layer can be processed independently of the first filtration layer, and more sophisticated. Processing can be performed. In particular, since a large particle size is used as the second filter medium of the second filtration layer, the head loss here is small, and the capacity of the effective head for the first filtration layer is effectively used. Can do. Moreover, since the 2nd filtration layer was hold | maintained by the support body, even when backwashing of the 1st filtration layer was performed at a big linear velocity, the filter medium of a 2nd filtration layer can be hold | maintained by a support body, and the outflow of a filter medium is prevented. Can do.
Moreover, by using activated carbon as a filter medium for the second filtration layer, adsorption treatment can be performed, and more advanced treatment can be performed. In addition, by discharging the backwash drainage of the first filtration layer from the intermediate discharge pipe, the linear velocity of the backwash water to the first filtration layer and the linear velocity of the backwash water to the second filtration layer can be independently set. Can be controlled. Further, by constituting the second filtration layer with an activated carbon cartridge supported by an individual support , it is possible to easily exchange the filter medium of the second filtration layer.
FIG. 1 is a diagram illustrating a configuration of an apparatus according to an embodiment.
FIG. 2 is a diagram showing a configuration of a filtration device.
FIG. 3 is a diagram illustrating a configuration of a cartridge.
FIG. 4 is a diagram showing an example in which a cartridge is applied to a square and a circular filtration device.
DESCRIPTION OF SYMBOLS 10 Mixing tank, 18 Coagulation tank, 22 Inclined plate settling tank, 24 Filtration apparatus, 24a 1st filtration layer, 24b 2nd filtration layer, 24c Support net | network, 24d Filtration apparatus main body, 24g Middle part, 24h Intermediate | middle discharge pipe, 32 mesh Basket material.
A backwashing method in filtration KaSo location for performing filtering processing by downward flow,
A first filtration layer that is filled with a first filter medium and separates suspended solids from the water to be treated;
Above the first filtration layer, a second filtration layer that is spaced apart from the surface of the first filtration layer and filled with a second filter medium having a larger particle size than the first filtration medium,
A support that supports the second filter medium of the second filtration layer;
An intermediate discharge pipe for discharging backwash drainage water for the first filtration layer to an intermediate part of the first filtration layer and the second filtration layer;
The backwash method is
Backwashing water is supplied from below the first filtration layer, and the backwashing water is passed through the first filtration layer and the second filtration layer. At this time, the second filtration layer has an expansion coefficient of 20 to 50%, and is second. A second filtration layer water backwashing step for washing the filtration layer;
After the second filtration layer water backwashing step, air is sent from below the first filtration layer, and the first filtration layer air backwashing step of backwashing the first filtration layer with air,
After this first filtration layer air backwashing step, backwashing water is supplied from below the first filtration layer, and part or all of the backwashing water is discharged from the intermediate drain pipe to the first filtration. A first filtration layer water backwashing step for backwashing the layer with water;
A method for backwashing a filtration device , comprising :
Above the second filtration layer, a support net for preventing the filter medium outflow is provided, and the linear velocity at which the backwash water passes through the second filtration layer in the second filtration layer water backwashing step is second. A backwashing method for a filtration device , wherein the flow rate is set so that the filter medium of the filtration layer is not pressed against the support net .
The support network in the second filtration layer, backwash method of filtering device, characterized in that installed in 1.1 to 2.0 times the position of the bed height.
The method for backwashing a filtration device , wherein the second filter medium of the second filtration layer is granular activated carbon .
JP22010899A 1999-08-03 1999-08-03 Filtration equipment backwash method Expired - Lifetime JP3652557B2 (en)
JP22010899A JP3652557B2 (en) 1999-08-03 1999-08-03 Filtration equipment backwash method
JP2001038107A JP2001038107A (en) 2001-02-13
JP3652557B2 true JP3652557B2 (en) 2005-05-25
ID=16746047
JP22010899A Expired - Lifetime JP3652557B2 (en) 1999-08-03 1999-08-03 Filtration equipment backwash method
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