WO2014157062A1 - Dispositif de filtration par gravité - Google Patents

Dispositif de filtration par gravité Download PDF

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Publication number
WO2014157062A1
WO2014157062A1 PCT/JP2014/058030 JP2014058030W WO2014157062A1 WO 2014157062 A1 WO2014157062 A1 WO 2014157062A1 JP 2014058030 W JP2014058030 W JP 2014058030W WO 2014157062 A1 WO2014157062 A1 WO 2014157062A1
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WIPO (PCT)
Prior art keywords
filtration
backwash
water
backwashing
raw water
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PCT/JP2014/058030
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English (en)
Japanese (ja)
Inventor
信男 我妻
研二 浦上
Original Assignee
神鋼環境メンテナンス株式会社
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Publication of WO2014157062A1 publication Critical patent/WO2014157062A1/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
    • B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
    • B01D24/004—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection arranged concentrically or coaxially
    • 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

Definitions

  • the present invention relates to a gravity filtration device.
  • a raw water chamber for storing raw water supplied from the outside, and the raw water in the raw water chamber disposed below the raw water chamber are lowered by gravity.
  • a filtration unit that permeates and filters, a filtration water chamber that is disposed below the filtration unit and stores filtered water that has passed through the filtration unit, and a backwash tube configured to backwash the filtration unit by siphoning
  • the thing provided with the filtration backwashing unit which has these is known.
  • the backwash pipe is formed so as to extend upward from the raw water chamber and extend downward from the uppermost portion.
  • the filtered water of the filtration water chamber permeates the filtration part from the lower side to the upper side by siphon action, backwashes the filtration part, and the backwashed water from the raw water room It is configured to rise and be discharged through the top of the backwash tube.
  • Patent Document 1 a device further provided with a backwash water tank communicating with a filtrate water chamber in order to store filtrate for backwashing is known (Patent Document 1).
  • a water tank for backwashing is arranged on the upper side of the filtration backwashing unit in order to make the installation area of the apparatus as small as possible. Further, the filtered water in the filtered water chamber is supplied to the backwashing water tank, and the filtered water for backwashing is stored in the backwashing water tank.
  • a gravity type filtration device has the raw water whose level has risen in the backwash pipe as the filtration resistance of the filtration section increases due to the filtration of the raw water, descends through the top of the backwash pipe and is discharged. The siphon action is configured to occur in the backwash tube.
  • filtered water for backwashing is configured to be supplied from the backwashing water tank to the filtered water chamber.
  • such a gravity type filtration device has a relatively small installation area due to the fact that the backwash water tank is arranged on the upper side of the filtration backwash unit, but it is filtered only by the filtered water in the backwash water tank. It is comprised so that a part may be backwashed. Therefore, such a gravity type filtration apparatus has a problem that the filtration part cannot always be backwashed sufficiently because the amount of filtered water for backwashing is not always sufficient.
  • the present invention has an object to provide a gravity type filtration device that has a relatively small installation area and can sufficiently back-wash the filtration unit.
  • the gravity filtration device is: A raw water chamber for storing raw water supplied from the outside, a filtration unit that is disposed below the raw water chamber and filters the raw water in the raw water chamber permeated downward by gravity, and is disposed below the filtration unit.
  • a filtration backwash unit A backwash water tank in communication with the filtered water chamber to store filtered water for backwashing;
  • the filtration units of the plurality of filtration backwash units are arranged in the vertical direction, and the plurality of filtration backwash units are configured in parallel with each other so as to collect filtrate water from each filtration backwash unit,
  • the water tank for backwashing is arranged above the uppermost raw water chamber of the plurality of filtration backwashing units, As the filtration resistance of the filtration part increases due to the filtration of the raw water, the level of the raw water rises in the backwash pipe, and the raw water is discharged downward through the top part of the backwash pipe.
  • the filtered water in the filtered water chamber is configured to pass through the filtration part from the lower side to the upper
  • FIG. 1 is a schematic view of the gravity filtration device of the present embodiment.
  • the gravity-type filtration device 1 of the present embodiment includes raw water chambers 11 a and 12 a that store raw water supplied from the outside, and the raw water chambers 11 a and 12 a disposed below the raw water chambers 11 a and 12 a.
  • Filtering portions 11b and 12b that permeate and filter the raw water of 12a downward by gravity, and a filtered water chamber 11c that is disposed below the filtering portions 11b and 12b and stores filtered water that has passed through the filtering portions 11b and 12b
  • There are provided a plurality of filtration backwash units 11 and 12 each having a 12c and backwash tubes 11d and 12d configured to backwash the filtration parts 11b and 12b by siphoning.
  • the gravity filtration device 1 of the present embodiment includes a backwash water tank 5 that communicates with the filtrate water chambers 11c and 12c in order to store filtered water for backwashing.
  • the backwash pipes 11d and 12d are formed so as to extend upward from the raw water chambers 11a and 12a and further downward from the uppermost portion.
  • the gravity type filtration apparatus 1 of this embodiment is the filtration water chamber of one filtration backwashing unit among several filtration backwashing units 11 and 12, the filtration water chamber of the other filtration backwashing unit, A communication portion 7 is provided for communicating with the backwash water tank 5.
  • the filtration units 11b and 12b of the plurality of filtration backwash units 11 and 12 are arranged in the vertical direction. Moreover, the plurality of filtration backwashing units 11 and 12 are configured in parallel to each other so as to collect filtrated water from the respective filtration backwashing units 11 and 12. Moreover, in the gravity type filtration apparatus 1 of this embodiment, the said backwash water tank 5 is distribute
  • the raw water level rises in the backwash pipes 11d and 12d as the filtration resistance of the filtration parts 11b and 12b increases due to the filtration of the raw water,
  • the raw water is discharged downward through the uppermost portions of the backwash tubes 11d and 12d, and a siphon action is generated in the backwash tubes 11d and 12d.
  • the filtered water supplied from the backwash water tank 5 to the filtered water chambers 11c and 12c by the siphon action further moves the filtration parts 11b and 12b from the lower side to the upper side by the siphon action.
  • Permeated and filtered water is configured to backwash the filtration parts 11b and 12b.
  • the gravity-type filtration device having the above-described configuration, when the filtration unit is backwashed in one filtration backwash unit among the plurality of filtration backwash units 11 and 12, to the filtered water chamber of the unit to be backwashed.
  • the filtered water can be supplied from the backwash water tank 5 via the communication part 7. Furthermore, filtered water can be supplied to the filtered water chamber of the unit to be backwashed from the filtered water chamber of another filtered backwashing unit via the communication portion 7. Therefore, the backwashing of the filtration part in one filtration backwash unit can be sufficiently performed.
  • the filtration units 11b and 12b of the plurality of filtration backwash units 11 and 12 are arranged in the vertical direction, and the uppermost side of the plurality of filtration backwash units 11 and 12 Since the backwash water tank 5 is disposed above the raw water chamber, the installation area of the apparatus can be made relatively small.
  • the gravity-type filtration device of the present embodiment has an effect that the installation area is relatively small and the filtration unit can be sufficiently backwashed.
  • the gravity filtration device 1 includes two filtration backwash units 11 and 12 in which filtration units are arranged in the vertical direction, for example, as shown in FIG. That is, the gravity filtration device 1 includes, for example, an upper filtration backwash unit 11 and a lower filtration backwash unit 12.
  • the filtration backwash units 11 and 12 are configured in parallel to each other so as to collect filtrated water.
  • the gravity filtration apparatus 1 includes one backwash water tank 5 disposed above the raw water chamber 11a of the uppermost filtration backwash unit 11, the backwash water tank 5 and each filtration backwash unit 11,
  • the twelve filtrated water chambers 11c and 12c are provided with a communication portion 7 for communicating with each other.
  • the communication unit 7 communicates the backwash water tank 5, the filtrate water chamber 11 c of the upper filtration backwash unit 11, and the filtrate water chamber 12 c of the lower filtration backwash unit 11.
  • a tubular communication pipe 7 is provided.
  • the gravity filtration device 1 is configured such that the backwash water tank 5 and the filtrate water chambers 11 c and 12 c communicate with each other through a communication pipe 7.
  • filtered water is supplied from the backwash water tank 5 to the filtered water chamber of one unit by the communication pipe 7 during backwashing of one filtering backwashing unit.
  • the filtered water is also supplied from the filtered water chamber to the filtered water chamber of one unit.
  • the gravity filtration device 1 includes raw water supply units 21 and 22 configured to supply raw water to the raw water chambers 11a and 12a, and siphon operation stop configured to stop the siphon operation to stop backwashing. Parts 41 and 42 and a filtered water discharge part 6 configured to discharge filtered water to the outside.
  • the filtered water discharge unit 6 has, for example, a filtered water discharge pipe having one end attached to a part of the communication pipe 7, and is configured to discharge and collect the filtered water that has passed through the communication pipe 7 outside the apparatus. Yes.
  • the backwash water tank 5 and the filtrate water chambers 11 c and 12 c communicate with each other through a communication pipe 7.
  • the said gravity type filtration apparatus 1 is comprised so that the filtered water which passed through the communicating pipe 7 may be discharged
  • the gravity filtration device 1 is configured such that the filtered water discharge unit 6 discharges filtered water from a position above the uppermost filtration backwash unit 11. The filtered water discharged by the filtered water discharge unit 6 and the filtered water stored in the backwash water tank 5 can be passed through the communication pipe 7.
  • the height at which the filtrate water is discharged by the filtrate water discharge part 6 is It becomes the height of the uppermost surface (hereinafter also simply referred to as the uppermost surface) of the filtered water stored in the backwash water tank 5.
  • the raw water supply units 21 and 22 include raw water tanks 21a and 22a for storing raw water to be sent to the raw water chambers 11a and 12a, and tubular loop seals that store the raw water that extends downward from the raw water tanks 21a and 22a.
  • Tanks 21b and 22b, and tubular raw water supply pipes 21c and 22c that send raw water from the bottom of the loop seal tanks 21b and 22b to the raw water chambers 11a and 12a, respectively, so that the raw water is sent to the raw water chambers 11a and 12a, respectively. It is configured.
  • the raw water tanks 21 a and 22 a are arranged above the uppermost surface of the filtered water stored in the backwash water tank 5.
  • the loop seal tanks 21b and 22b extend downward from the raw water tanks 21a and 22a to at least the heights of the filtrate water chambers 11c and 12c.
  • the raw water supply pipes 21c and 22c are configured to send raw water from the bottom of the loop seal tanks 21b and 22b to the raw water chambers 11a and 12a from the lateral direction.
  • the raw water stored in the raw water tanks 21a and 22a can be dropped to the loop seal tanks 21b and 22b by gravity.
  • natural water sent from the position higher than each filtration backwash unit 11 and 12 can be made to flow in into each raw
  • the plurality of filtration backwash units 11 and 12 are arranged such that the respective filtration portions 11 b and 12 b are arranged in the vertical direction. Therefore, the gravity filtration device 1 can have a smaller installation area than a plurality of filtration backwash units arranged in the horizontal direction. Moreover, the said gravity type filtration apparatus 1 is excellent in the capability of the filtration process rather than the thing provided with one filtration backwashing unit. In addition, the some filtration backwashing units 11 and 12 are distribute
  • the filtration backwash units 11 and 12 include raw water chambers 11a and 12a for storing raw water sent from the raw water supply pipes 21c and 22c, and a filter disposed below the raw water chambers 11a and 12a. Parts 11b and 12b and filtered water chambers 11c and 12c arranged below the filtering parts 11b and 12b.
  • the raw water in the raw water chambers 11a and 12a permeates through the filtering parts 11b and 12b by gravity, and is filtered.
  • transmitted the parts 11b and 12b is comprised so that it may store in the filtrate water chambers 11c and 12c.
  • the filtration backwash units 11 and 12 have tubular backwash tubes 11d and 12d formed in a substantially inverted U shape.
  • the backwash pipes 11d and 12d extend upward from the raw water chambers 11a and 12a, further extend to the upper side of the uppermost surface of the filtered water stored in the backwash water tank 5, and from the uppermost part to the lowermost filtered water chamber. It is arranged to extend downward to the height of 11c, 12c. Note that the uppermost portions of the backwash pipes 11d and 12d are disposed below the surface of the raw water stored in the raw water tanks 21a and 22a.
  • the filtration backwash units 11 and 12 are arranged such that the filtration parts 11b and 12b of the filtration backwash units 11 and 12 are arranged vertically.
  • the filtration resistance of the filtration parts 11b and 12b (also indicated by Z in FIG. 1 and FIG. 2) is increased by the filtration of raw water.
  • the water level of the raw water rises in the backwash tubes 11d and 12d.
  • the atmospheric pressure in the backwash pipes 11d and 12d decreases, and a water flow that rises in the backwash pipes 11d and 12d is generated from the raw water chambers 11a and 12a.
  • the filtered water in the filtered water chambers 11c and 12c is supplied to the raw water chamber. It flows upward toward 11a and 12a. And the filtration parts 11b and 12b can be back-washed when the filtrate water of the filtration water chambers 11c and 12c flows upwards and permeate
  • the raw water chambers 11a and 12a are formed to be hollow so that a predetermined amount of raw water can be stored.
  • the shape of the raw water chambers 11a and 12a is not particularly limited, and examples of the shape include a hollow rectangular parallelepiped shape or a hollow cylindrical shape that is flat in the lateral direction.
  • one end on the downstream side of the raw water supply pipes 21c and 22c is attached to the side.
  • the raw water chambers 11a and 12a are configured such that raw water from the raw water supply pipes 21c and 22c is supplied from the lateral direction and a predetermined amount of raw water is stored.
  • one end of backwash pipes 11d and 12d is attached to the upper part of the raw water chambers 11a and 12a.
  • the raw water chambers 11a and 12a are configured such that the raw water enters the backwash tubes 11d and 12d as the filtration resistance (filter resistance) of the filtration units 11b and 12b increases.
  • the filtration units 11b and 12b include a granular filter medium, and are formed, for example, in a rectangular parallelepiped shape or a column shape that is flat in the lateral direction by the filter medium.
  • the vertical thickness of the filtration parts 11b, 12b is not particularly limited, and is, for example, 60 cm to 80 cm.
  • the granular filter medium examples include, for example, standard filter sand for water supply, and more specifically, anthracite, manganese sand, activated carbon, and the like.
  • the filter parts 11b and 12b are arranged on the lower side and support the filter medium, and the plate-like support plate 9 is arranged on the upper side of the support plate 9 to pass water between the upper side and the lower side of the support plate 9.
  • a plurality of water flow members 8 are provided.
  • a plurality of holes are formed in the support plate 9 in the portion where the water passage member 8 is disposed. According to the support plate 9 in which a plurality of holes are formed and the plurality of water-permeable members 8 arranged in the portion in which the holes are formed, the filtration units 11b and 12b and the filtration water chamber 11c in filtration and backwashing. , 12c can be used to circulate water.
  • the water flow member 8 includes a plurality of disk strainers formed in a disk shape.
  • the disc strainer is configured such that water passes in the vertical direction. Further, the plurality of disk strainers are usually stacked in the vertical direction. The number of the plurality of disk strainers is, for example, 8 to 15. The plurality of stacked disk strainers are configured such that water does not pass through the granular filter medium from the gaps between them.
  • the filtered water chambers 11c and 12c are formed hollow inside so that the filtered water that has passed through the filtering parts 11b and 12b can be stored.
  • the shape of the filtered water chambers 11c and 12c is not particularly limited, and examples of the shape include a hollow rectangular parallelepiped shape or a hollow cylindrical shape that is flat in the lateral direction.
  • One end of a communication pipe 7 is attached to the filtered water chambers 11c and 12c.
  • the internal spaces of the filtrate water chambers 11 c and 12 c communicate with the backwash water tank 5 through the communication pipe 7.
  • the backwash tubes (siphon tubes) 11d and 12d are formed in a substantially inverted U shape as shown in FIG.
  • One end of the backwash pipes 11d and 12d is connected to the raw water chambers 11a and 12a, and the other end of the backwash pipes 11d and 12d is arranged outside the raw water chambers 11a and 12a.
  • the other ends of the backwash tubes 11d and 12d are arranged below the lowermost filtration unit 12b.
  • the backwash pipes 11d and 12d are comprised so that the water which permeate
  • the backwash pipes 11d and 12d receive backwashed water that has moved from the filtered water chambers 11c and 12c to the raw water chambers 11a and 12a through the filtering portions 11b and 12b by backwashing from the raw water chambers 11a and 12a. It is configured to discharge.
  • the backwash pipes 11d and 12d As shown in FIG. 2, the water level of the raw water rises as the filtration resistance of the filtration parts 11b and 12b rises due to the filtration of the raw water. Thereafter, the raw water reaches the uppermost part of the backwash pipes 11d and 12d, and the raw water further descends and is discharged from the uppermost part, thereby causing siphon action.
  • the backwash pipes 11d and 12d are configured to cause siphon action inside by discharging raw water. In such siphon action, the atmospheric pressure in the backwash pipes 11d and 12d on the other end side decreases, and the water in the raw water chambers 11a and 12a starts to move upward.
  • the filtered water in the filtered water chambers 11c and 12c permeates the filtering parts 11b and 12b from the lower side to the upper side of the filtering parts 11b and 12b, and backwashes the filtering parts 11b and 12b. Further, the backwashed water is discharged from the raw water chambers 11a and 12a through the backwash pipes 11d and 12d. Accordingly, as shown in FIG. 3, the filtrate is supplied from the backwash water tank 5 to the filtrate water chambers 11 c and 12 c through the communication pipe 7. In this way, the backwashing is performed until the siphon action is stopped by the siphon action stop unit described later.
  • the water tank 5 for backwashing is formed in a hollow rectangular parallelepiped shape or a hollow cylindrical shape having an open top as shown in FIG.
  • the backwash water tank 5 is disposed above the uppermost raw water chamber 11a of the plurality of filtration backwash units 11 and 12 arranged in the vertical direction. Therefore, the gravity filtration device 1 is more than the gravity filtration device in which the backwash water tank 5 is arranged next to the plurality of filtration backwash units 11 and 12 in which the filtration units 11b and 12b are arranged in the vertical direction. The installation area can be reduced.
  • the upper part of the backwash water tank 5 may be opened.
  • the backwash water tank 5 may be configured to cover an opening facing upward.
  • One end of a communication pipe 7 is attached to the backwash water tank 5 so that the internal space of the backwash water tank 5 and the internal spaces of the filtrate water chambers 11c and 12c communicate with each other.
  • the backwash water tank 5 during filtration, filtrate water supplied from the filtrate water chambers 11c and 12c is taken into the interior through the communication pipe 7, and filtrate water for backwashing the filtration parts 11b and 12b is stored. be able to. Further, according to the water tank 5 for backwashing, any one of the filtered water stored in the filtration backwashing unit 11, 12 b of any one of the filtration backwashing units 11, 12 can be backwashed via the communication pipe 7 during backwashing. Can be supplied to the filtered water chambers 11c and 12c. Thus, the water surface height (water level) of the water surface in the water tank 5 for backwashing changes by filtration and backwashing.
  • the water tank 5 for backwashing is arranged so that the highest water surface (the uppermost surface) of the filtered water stored therein is lower than the uppermost parts of the backwashing pipes 11d and 12d.
  • the communication portion 7 (communication pipe) includes a pipe formed so as to connect the lowermost filtered water chamber 12 c and the backwash water tank 5, a middle of the pipe, and other pipes. And a pipe formed so as to connect the filtered water chamber 11c.
  • the communication portion 7 is configured to communicate with the internal space of the backwash water tank 5 and the internal spaces of the filtrate water chambers 11c and 12c.
  • the communication part 7 is arranged on the side of each filtration backwash unit 11, 12, and each filtrate water obtained in each filtration backwash unit 11, 12 is lower than the lowermost part of the backwash water tank 5. It is formed so that it may merge at the side.
  • the filtered water in the filtrate water chambers 11 c and 12 c can be supplied to the backwash water tank 5 through the pipes described above during filtration. Moreover, at the time of backwashing, the filtrate stored in the water tank 5 for backwashing can be supplied to each filtrate water chamber 11c, 12c through said each piping. Furthermore, according to the communication part 7, for example, as shown in FIG. 3, when the filtration part 11b of the upper filtration backwashing unit 11 is backwashed, to the filtered water chamber 11c of the upper filtration backwashing unit 11, The filtered water can be supplied from the filtered water chamber 12 c of the lower filtration backwash unit 12. In addition, the arrow in FIG. 3 has shown the flow of water when the filtration part 11b of the upper filtration backwashing unit 11 is backwashed.
  • the gravity filtration device 1 not only backwash water is supplied from the backwash water tank 5, but also backwash water from a backwash unit that is not backwashed. Is supplied. Therefore, in the gravity filtration device 1, compared with a filtration device configured so that filtered water for backwashing is supplied only from the backwashing water tank, filtration in backwashing is performed by the amount of the communication portion 7. The amount of water is greater and the flow rate of filtered water is faster. Thereby, according to the gravity type filtration apparatus 1 of this embodiment, the filtration parts 11b and 12b can fully be backwashed.
  • the gravity filtration device 1 of the present embodiment since the filtration parts 11b and 12b can be sufficiently backwashed, dirt on the backwashed filtration parts 11b and 12b can be more sufficiently removed. Therefore, filtration of the filtration parts 11b and 12b in the filtration backwash unit after backwashing becomes more efficient, and the filtration efficiency of the gravity filtration device 1 can be improved.
  • the gravity type filtration device 1 of the present embodiment compared with a gravity filtration device that supplies filtered water only from the backwash water tank 5 during backwashing, for example, the amount of water used for backwashing, Alternatively, the flow rate during backwashing can be about 1.2 times. Therefore, the gravity type filtration device 1 of this embodiment can reliably remove the turbidity accumulated in the filtration units 11b and 12b, as compared with the gravity type filtration device that supplies filtered water only from the backwash water tank 5. it can. Therefore, in the gravity type filtration apparatus 1 of this embodiment, the filtration time (filtering continuation time) which filters raw
  • the siphon action stop portion includes tubular siphon stop pipes 41 and 42 for stopping the siphon action.
  • One end of the siphon stop pipes 41 and 42 is arranged with the opening facing downward, and the one end is located above the bottom surface of the backwash water tank 5 and below the top surface. That is, the one end is arranged in the lower part of the backwash water tank 5. Further, one ends of the siphon stop pipes 41 and 42 are arranged at a position higher than the other ends (ends on the backwash water discharge side) of the backwash pipes 11d and 12d. On the other hand, the other ends of the siphon stop tubes 41 and 42 are connected to the upper portions of the backwash tubes 11d and 12d.
  • the water level of the filtered water in the backwash water tank 5 decreases as the backwash progresses, and the water level is the position of one end of the siphon stop pipes 41, 42.
  • the air can enter through the opening at one end of the siphon stop pipes 41 and 42.
  • air is caused to flow into the backwash pipes 11d and 12d through the siphon stop pipes 41 and 42, and the siphon action that has occurred in the backwash pipes 11d and 12d during backwashing is stopped. Can be made.
  • the siphon action is stopped. Therefore, the height of the one end is the height of the lowermost surface of the filtered water stored in the backwash water tank 5.
  • the siphon action stop portion includes siphon stop pipes 41 and 42 attached to the backwash pipes 11d and 12d so that the siphon action in the backwash pipes 11d and 12d can be stopped independently.
  • the time from when the backwashing starts until the backwashing is stopped by the siphon action stop unit is determined by the type of filter medium constituting the filtering units 11b and 12b, the amount of water in the backwashing water tank 5, and the like. About minutes.
  • the filtered water discharge unit 6 is configured to discharge the filtered water in the filtered water chambers 11c and 12c to the outside of the apparatus. As described above, the position of the uppermost surface of the filtrate stored in the backwash water tank 5 is determined by the filtrate water discharge position in the filtrate discharge section 6.
  • the filtered water discharge section 6 includes a tubular filtered water discharge pipe 6 configured to discharge filtered water from a predetermined height to the outside, for example, as shown in FIG.
  • the filtered water discharge pipe 6 has a vertical pipe 6a whose lower end is attached in the middle of the communication pipe 7 and extends upward, and a branch pipe 6b that is attached in the middle of the vertical pipe 6a and extends in the horizontal direction.
  • One end of the branch pipe 6b is attached to the vertical pipe 6a at a predetermined height.
  • the branch pipe 6b is configured such that the filtered water is discharged and collected when the level of the filtered water rises to the predetermined height. The position of the uppermost surface is determined by the predetermined height of the branch pipe 6b.
  • one end of the branch pipe 6b is attached to the vertical pipe 6a at a predetermined height, so that the filtrate water in the filtrate water chambers 11c and 12c after the backwashing is stopped is the height of the top surface.
  • the filtrate water in the filtrate water chambers 11c and 12c after the backwashing is stopped is the height of the top surface.
  • the filtered water starts to be discharged from the other end (discharge port) of the branch pipe 6b, and thus the rise of the filtered water level in the backwash water tank 5 is stopped. Thereafter, the filtered water is continuously discharged from the branch pipe 6b.
  • the filtered water discharge section 6 includes a plurality of filtered water discharge pipes (not shown) extending upward from the filtered water chambers 11c and 12c to the height of the uppermost surface in place of the filtered water discharge pipe 6 described above. It may be.
  • the gravity filtration device 1 includes a backwash pit 10 for temporarily storing water (backwashed backwash water) discharged from the other ends of the backwash pipes 11d and 12d. ing.
  • the backwash pit 10 is formed in a hollow rectangular parallelepiped shape or a hollow cylindrical shape opened upward. Further, the backwash pit 10 is configured such that the highest position of the water surface in the pit 10 is lower than the upper surfaces of the filtrate water chambers 11c and 12c on the lowermost side.
  • the backwash pit 10 is configured such that when the water discharged by backwashing reaches the highest position on the water surface in the pit 10, the water overflows out of the pit 10 and further the water is discharged downward. Yes.
  • the backwash pit 10 is arranged such that the water level of the water stored therein is higher than the other ends of the backwash pipes 11d and 12d. Further, the backwash pit 10 is arranged such that the water level of the water stored therein is lower than the water level in the backwash water tank 5 at the end of the backwash.
  • the gravity filtration device 1 may include backwashing promotion portions 31 and 32 configured to cause the siphon action in the backwash tubes 11d and 12d more reliably.
  • the backwash promoting portions 31 and 32 include, for example, annular pipes 31 a and 32 a formed into a vertically long ring shape by a tubular body, the annular pipes 31 a and 32 a, and the backwash pipes 11 d and 12 d Tubular backwashing promotion pipes 31b, 32b connecting the backwashing promotion pipes 31b, 32b, and tubular backwashing promotion auxiliary pipes 31c connecting the annular pipes 31a, 32a and the backwashing pipes 11d, 12d, 32c, and vacuum pumps 31d and 32d (ejectors) attached to the lowermost portions of the annular tubes 31a and 32a.
  • the upper ends of the annular pipes 31 a and 32 a are arranged higher than the backwash pipes 11 d and 12 d, and the lower ends of the annular pipes 31 a and 32 a are arranged lower than the lowermost surface of the filtered water stored in the backwash water tank 5. .
  • the lower ends of the annular pipes 31a and 32a are arranged at the same height as the vacuum pumps 31d and 32d, for example.
  • the backwashing promotion pipes 31b and 32b are arranged below the backwashing promotion auxiliary pipes 31c and 32c. One end of the backwashing promotion pipes 31b and 32b is attached to a portion below the uppermost part of the backwashing pipes 11d and 12d. The other ends of the backwash promoting tubes 31b and 32b are attached to the annular tubes 31a and 32a. And the backwashing promotion pipe
  • the backwash promotion auxiliary pipes 31c and 32c are arranged above the backwash promotion pipes 31b and 32b.
  • One end of the backwashing promotion auxiliary pipes 31c, 32c is attached to the uppermost part of the backwashing pipes 11d, 12d, and the other end of the backwashing promotion auxiliary pipes 31c, 32c is attached to the uppermost part of the annular pipes 31a, 32a. Yes.
  • the filtration resistance of the filtration parts 11b and 12b increases with filtration, so that the raw water in the backwashing pipes 11d and 12d reaches the height of the backwashing promotion pipes 31b and 32b. Then, the raw water in the backwash pipes 11d and 12d reaches the annular pipes 31a and 32a through the backwash promotion pipes 31b and 32b, and the raw water can be dropped downward in the annular pipes 31a and 32a.
  • the raw water falling downward is sensed and the vacuum pumps 31d, 32d are operated, and the annular pumps 31a, 32a and the backwashing promotion pipe 31b,
  • the atmospheric pressure in the backwash pipes 11d and 12d can be lowered via the 32b and the backwash promotion auxiliary pipes 31c and 32c. And it can raise
  • the vacuum pumps 31d and 32d are configured to discharge the raw water that has fallen through the annular pipes 31a and 32a further downward. According to the gravity filtration device 1, the water discharged from the vacuum pumps 31 d and 32 d can be temporarily stored in the backwash pit 10.
  • the gravity filtration device 1 of the present embodiment repeatedly supplies raw water by filtering the raw water through the filtration units 11b and 12b and backwashing the filtration units 11b and 12b by supplying the raw water. It is preferably used.
  • the gravity filtration device of the present embodiment is as illustrated above, but the present invention is not limited to the gravity filtration device illustrated above. Moreover, the various aspects used in a general gravity filtration apparatus can be employed as long as the effects of the present invention are not impaired.
  • the present invention is not limited to the above-described embodiment, and can be appropriately modified within the intended scope of the present invention. Moreover, the effect of this invention is not limited to the said embodiment.
  • the embodiment disclosed this time should be considered as illustrative in all points and not restrictive.
  • the scope of the present invention is shown not by the above description but by the claims. Further, the scope of the present invention is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention porte sur un dispositif de filtration par gravité doté d'une pluralité d'unités de filtration et de lavage à contrecourant, ayant chacune : une chambre d'eau brute qui stocke de l'eau brute provenant de l'extérieur ; une unité de filtration qui filtre l'eau brute de la chambre d'eau brute par provocation d'une percolation vers le bas au moyen de la gravité ; une chambre d'eau filtrée qui stocke l'eau filtrée qui a percolé dans l'unité de filtration ; un tube de lavage à contrecourant tubulaire formé de façon à s'étendre vers le haut à partir de la chambre d'eau brute et à s'étendre en outre vers le bas à partir de la section supérieure de façon à provoquer un effet de siphon. Le dispositif est également doté d'une cuve d'eau de lavage à contrecourant qui est raccordée à la chambre d'eau filtrée et qui communique avec celle-ci afin de stocker de l'eau filtrée pour le lavage à contrecourant. Le dispositif est également doté d'une unité de raccordement et de communication qui raccorde et fait communiquer la cuve d'eau de lavage à contrecourant, la chambre d'eau filtrée d'une unité de filtration et de lavage à contrecourant et la chambre d'eau filtrée d'une autre unité de filtration et de lavage à contrecourant. Le dispositif de filtration par gravité est conçu de façon à ce que les unités de filtration de la pluralité d'unités de filtration et de lavage à contrecourant soient disposées dans la direction verticale, la pluralité d'unités de filtration et de lavage à contrecourant soient disposées en parallèle les unes avec les autres de façon à récupérer l'eau filtrée provenant de chacune des unités de filtration et de lavage à contrecourant, la cuve d'eau de lavage à contrecourant soit disposée au-dessus de la chambre d'eau brute supérieure de la pluralité d'unités de filtration et de lavage à contrecourant et l'eau filtrée présente dans les chambres d'eau filtrée percole à travers les unités de filtration de bas en haut au moyen de l'effet de siphon dans le tube de lavage à contrecourant, ce qui lave ainsi à contrecourant les unités de filtration.
PCT/JP2014/058030 2013-03-26 2014-03-24 Dispositif de filtration par gravité WO2014157062A1 (fr)

Applications Claiming Priority (2)

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JP2013-065132 2013-03-26
JP2013065132A JP2014188415A (ja) 2013-03-26 2013-03-26 重力式濾過装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106390580A (zh) * 2016-08-31 2017-02-15 江苏江华水处理设备有限公司 一种大流量重力式方形无阀过滤器虹吸系统
JP2017225940A (ja) * 2016-06-23 2017-12-28 三晃海洋開発株式会社 高架貯水槽付重力式自動逆洗二段式砂ろ過装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6488368B2 (ja) * 2015-11-19 2019-03-20 株式会社神鋼環境ソリューション 水処理設備
KR101731949B1 (ko) 2016-04-21 2017-05-25 (주)동양화학 자연 유하식 역세 기능이 구비된 정수여과장치 및 역세방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5588813U (fr) * 1978-12-12 1980-06-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5588813U (fr) * 1978-12-12 1980-06-19

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017225940A (ja) * 2016-06-23 2017-12-28 三晃海洋開発株式会社 高架貯水槽付重力式自動逆洗二段式砂ろ過装置
CN106390580A (zh) * 2016-08-31 2017-02-15 江苏江华水处理设备有限公司 一种大流量重力式方形无阀过滤器虹吸系统

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