WO2019009128A1 - Dispositif de floculation et de sédimentation et système de purification d'eau - Google Patents

Dispositif de floculation et de sédimentation et système de purification d'eau Download PDF

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Publication number
WO2019009128A1
WO2019009128A1 PCT/JP2018/024059 JP2018024059W WO2019009128A1 WO 2019009128 A1 WO2019009128 A1 WO 2019009128A1 JP 2018024059 W JP2018024059 W JP 2018024059W WO 2019009128 A1 WO2019009128 A1 WO 2019009128A1
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Prior art keywords
settling
water
treated
pressure vessel
coagulating
Prior art date
Application number
PCT/JP2018/024059
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English (en)
Japanese (ja)
Inventor
正伸 櫻井
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日立造船株式会社
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Filing date
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Publication of WO2019009128A1 publication Critical patent/WO2019009128A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water

Definitions

  • the present invention relates to water purification devices, and more particularly to coagulation and settling devices.
  • a sedimentation device provided with a sloped plate or a sloped pipe is immersed in the sedimentation basin to constitute a kind of multi-layered sedimentation basin to increase the removal rate (for example, Patent Document 1, Non-Patent Document 1).
  • Patent Document 1 Non-Patent Document 1
  • FIG. 8 by installing a device equipped with an inclined member with an inclination angle ⁇ and a height H in the sedimentation basin, the sedimentation basin works for h layers, and as a result, the sedimentation efficiency is H It increases to / h times.
  • those used in horizontal flow those used in upward flow, and those that can be used for water flow in either direction exist. Since the presence of a water flow is a condition for improving the precipitation efficiency, means have been provided to create such a water flow.
  • a filtration device is provided downstream of the sedimentation device, and a means for supplying water to the filtration device is currently provided.
  • a pump or a height difference is used as such water supply means.
  • An object of the present invention is to provide a means for simplifying the configuration of a water purification facility and improving the efficiency of a water purification system in view of the above situation.
  • the present invention adopts the following configuration. That is, it is an apparatus for coagulating and settling the inflowing liquid to be treated, and has a pressure vessel which is sealed and capable of maintaining the inside at a predetermined pressure, and a precipitation separation unit provided inside the pressure vessel and provided with inclined plates. It is a flocculating settling device.
  • a flocculating settling device By adopting such a configuration, it is possible to obtain a water flow toward the inclined plate by utilizing the water pressure of the treated water flowing into the coagulating and settling apparatus, and a mechanism for generating the water flow, such as a pump and height difference, is omitted. can do.
  • the coagulating and settling equipment can be simplified and the space can be saved, and the entire water purification system can be streamlined.
  • a coagulant is added to the liquid to be treated, and a stirring unit for stirring the liquid to be treated and a flock forming part for forming a flock in the liquid to be treated are contained in the pressure vessel. , May be included.
  • a flocculant is added to the water to be treated, and the water to be treated to which the flocculant is added is stirred and mixed as a step prior to the precipitation treatment to coagulate the substance to be removed in the water to be treated ( Need to form flocks).
  • the stirring unit may be a flow passage disposed vertically in the center of the pressure vessel, and the flock forming unit is a flow passage wider than the stirring unit that surrounds the periphery of the stirring unit. It may be. With such a configuration, the space in the pressure vessel can be efficiently utilized to arrange the stirring portion and the flock portion, and a wide flow path can be secured.
  • a plurality of the inclined plates may be arranged at equal intervals between the flock forming portion and the inner wall of the pressure vessel.
  • the plurality of inclined plates may be arranged radially in the pressure vessel, and an angle between a side of each of the inclined plates in contact with the inner wall of the pressure vessel and a horizontal plane may be 60 degrees or more.
  • the inclination angle of the inclined plate with respect to the horizontal surface is smaller, more layers can be formed within a predetermined height range, so that the sedimentation efficiency is high, but sediment may be deposited on the upper surface of the inclined plate Will occur.
  • the inclination angle is increased to about 60 degrees, the sedimented sediments will surely slide down without being deposited on the inclined plate. For this reason, when the inclined plate of the device is configured as described above, it is possible to improve the aggregation and sedimentation efficiency of the device while preventing the sediment from being deposited on the inclined plate.
  • the present invention can also be grasped as the following water purification system. That is, it is a water purification system comprising a flocculating settling device and a filtering device, wherein the flocculating settling device comprises a pressure vessel, a stirring unit for stirring the liquid to be treated in the pressure vessel, the stirred object to be treated.
  • the filtration apparatus has a pressure vessel and a filter medium in the pressure vessel, and the flocculating and settling apparatus and the filtration apparatus have It is connected continuously in a sealed state, and the water to be treated that has flowed in from the inflow port of the coagulating and settling device is subjected to flocculation settling treatment and filtration without being opened to the atmosphere, and water is sent from the filtering device to the water purification reservoir or distribution reservoir.
  • Water purification system characterized in that
  • the present invention can provide a means for simplifying the configuration of the water purification facility and improving the efficiency of the water purification system.
  • FIG. 1 is a side view showing the appearance of the coagulating and settling apparatus according to the first embodiment.
  • FIG. 2 is a view showing an outline of the internal configuration of the coagulation / settling apparatus according to the first embodiment.
  • FIG. 3 is a schematic view showing the flow of water in the coagulating and settling apparatus according to the first embodiment.
  • FIG. 4A is a plan view showing an inclined wing of the coagulating and settling apparatus according to the first embodiment
  • FIG. 4B is a perspective view showing an inclined wing of the coagulating and settling apparatus according to the first embodiment.
  • FIG. 5 is a view showing an outline of an internal configuration of a coagulating and settling apparatus according to a modification of the first embodiment.
  • FIG. 1 is a side view showing the appearance of the coagulating and settling apparatus according to the first embodiment.
  • FIG. 2 is a view showing an outline of the internal configuration of the coagulation / settling apparatus according to the first embodiment.
  • FIG. 3 is a schematic
  • FIG. 6 is a schematic view showing a general water purification system.
  • FIG. 7 is a schematic view showing a water purification system according to a second embodiment.
  • FIG. 8 is an explanatory view showing the relationship among the height, the inclination angle, the interval, and the layer height of the inclined plate.
  • FIG. 1 shows the appearance of the coagulating and settling apparatus 1 according to the present embodiment
  • FIG. 2 shows the internal configuration of the coagulating and settling apparatus 1.
  • the coagulating and settling apparatus 1 takes in the water to be treated as a treatment target into the apparatus, carries out the flocculation settling treatment inside, and discharges the treated water (hereinafter also referred to as treated water) to the outside of the apparatus A pressure vessel which can be sealed and maintain the inside at a predetermined pressure.
  • the coagulating and settling apparatus 1 has a casing 2 in which the lower part of the cylindrical shape is conical as shown in FIG.
  • the coagulating and settling apparatus 1 internally has a stirring unit 3, a floc forming unit 4, a precipitation separation unit 5, and a treated water outflow unit 6.
  • FIG. 3 is a schematic view showing the flow of water in the coagulating and settling apparatus 1 according to the first embodiment.
  • the coagulant is added in advance, and the water to be treated taken into the apparatus from the water inlet 21 has a stirring unit 3, a flock forming unit 4, a sedimentation separation unit 5, a treated water outflow unit 6.
  • the coagulation / sedimentation apparatus 1 is a sealed pressure vessel, the treated water can be treated outside the apparatus without using a water feeding means such as a pump by utilizing the water pressure of the treated water flowing into the apparatus.
  • water can be supplied to a post-stage filtration device or the like.
  • the stirring unit 3 has a cylindrical shape and is located at the center of the coagulating and settling apparatus 1, and a screw (hereinafter referred to as an in-line mixer 31) in which a blade is spirally formed around the cylinder is located inside the cylinder. Fixedly installed along the axial direction.
  • the in-line mixer 31 and the water flow of the water to be treated itself passing through the stirring unit 3 (i.e. without using other power) stir the water to be treated to which the coagulant is added.
  • the flow velocity of the water to be treated passing through the stirring unit 3 be a relatively high speed (for example, about 1 m per second).
  • the water to be treated flows upward from the bottom of the stirring unit 3 and flows out from the upper end of the stirring unit 3 to the flock forming unit 4.
  • the flock forming portion 4 is a cylindrical portion disposed around the stirring portion 3, and the diverting flow plate 41 is axially formed between the stirring portion 3 outer wall and the flock forming portion 4 inner wall inside the cylinder.
  • the flow-through plate 41 has, for example, a shape in which one end of the outer periphery of a doughnut-shaped disc having a circular space having the same diameter as the outer diameter of the stirring portion 3 is cut away.
  • the flow plate 41 is disposed such that the notched portion is at an opposite position across the stirring portion 3.
  • the water to be treated that has flowed out of the stirring portion 3 flows downward through the notch portion of the flock forming portion 4 while traveling along the upper surface of the diverting flow plate 41, and the water flow is performed by the straightening wall 42 provided below the flock forming portion 4.
  • the direction is adjusted to flow out to the precipitation separation unit 5. In this manner, the flow is blocked by the flow-through plate 41, and by flowing down while being stirred at a moderate speed (for example, about 20 cm per second), a flock is formed.
  • the settling section 5 has a conical portion (sludge chamber 52) in the lower part of the coagulating settling apparatus 1 and a space between the outer wall of the floc forming section 4 and the inner wall of the casing 2 of the coagulating settling apparatus 1 (inclined wing section 51).
  • the inclined wing portion 51 is provided with an inclined wing 511 which will be described in detail later.
  • the water to be treated makes a flow from the lower part to the upper part of the inclined wing 51, but of the flocs in the treated water formed by the flock forming part 4, relatively large objects are carried to the inclined wing 51 before being carried , Sink to the bottom of the mud chamber 52.
  • the loose flow plate 61 is a circular plate-like member having a diameter slightly smaller than the diameter of the casing 2 of the coagulating and settling apparatus 1, and is disposed horizontally so that the center coincides with the center of the coagulating and settling apparatus 1. ing. For this reason, a gap is generated between the outer periphery of the flow-spreading plate 61 and the inner wall of the housing 2, and the water to be treated which has passed through the settling / separating unit 5 flows into the treated water outlet 6 from this gap.
  • the coagulating and settling apparatus 1 is an apparatus having an amount of treated water of about 100 cubic meters per day, and the dimensions of the above main parts can be, for example, as shown below. That is, the stirring portion 3 located at the center is about 50 mm in diameter, the flock forming portion 4 located on the outside thereof is about 400 mm in diameter, and the settling separation portion 5 located on the outside thereof is about 1200 mm in diameter The height of the settling device at 5 is about 890 mm.
  • the inclined wing portion 51 has a cylindrical shape as a whole, and a donut shape in a plan view, and the stirring portion 3 and the flock forming portion 4 are arranged in a hole portion at the center thereof. Then, a plurality of (for example, 40) inclined wings 511 are arranged radially at equal intervals with respect to the center of the donut shape (that is, the central axis of the coagulating and settling apparatus 1).
  • the inclined wing 511 in the present embodiment corresponds to an inclined plate.
  • FIG. 4 is a diagram showing forty inclined wings 511 (hereinafter referred to as an inclined wing group).
  • FIG. 4A shows a state in plan view of the inclined wing group
  • FIG. 4B shows a state in which the inclined wing group is seen from the side slightly diagonally above.
  • each inclined wing extends radially from the inner peripheral portion (that is, the portion in contact with the outer wall of the flock forming portion 4) in plan view, and the upper end side extends from the inner peripheral portion to the outer peripheral portion It extends horizontally and straightly. Therefore, the distance D between adjacent inclined wings 511 is different between the outer peripheral portion (that is, the portion in contact with the inner wall of the housing 2) and the inner peripheral portion.
  • the outer peripheral portion about 94 mm
  • in the inner peripheral portion Is about 31 mm.
  • each inclined wing has the same height (for example, about 815 mm), and each has an inclination angle with respect to the circumferential direction, but this angle also has an outer peripheral portion and an inner peripheral portion And they are different.
  • the angle of the inclined wing 511 is 60 degrees at the outer peripheral portion, while it is 79 degrees at the inner peripheral portion. That is, the inclined wing 511 is not a simple rectangular flat plate inclined, but the side in contact with the inner peripheral portion and the side in contact with the outer peripheral portion have different lengths, and at the time of deployment they have curves on the inner peripheral side and the outer peripheral side It is formed of a plate-like member (for example, a stainless steel plate).
  • the inclination angle of the inclined wing 511 is desirably 60 degrees or more. This ensures that the sediment that has settled on the upper surface of the inclined wing 511 slides down without being deposited.
  • an effective settling space can be formed without gaps in the entire device. That is, even if the space for carrying out the aggregation and precipitation process is cylindrical, the inclined wings 511 can be disposed without waste, and the aggregation and precipitation process can be performed efficiently. Such an effect is not limited to the coagulating and settling apparatus 1 according to the present embodiment, and can be similarly exhibited even in the case where the inclined blade group is installed in a cylindrical open type sedimentation basin, for example.
  • blade may be installed in the inclined wing
  • FIG. 8 is an explanatory view showing the relationship among the height, the inclination angle, the interval, and the layer height of the inclined plate.
  • the inclination angle ⁇ of the outer peripheral portion of the inclined wing 511 is 60 degrees and the interval D between the wings is about 94 mm
  • the height h of the layer is about 163 mm.
  • the height H of the inclined wing 511 is about 815 mm, this value is divided by 163 to be about 5, and the sedimentation efficiency is about 5 times that in the case where the inclined wing 511 is not used.
  • the inclination angle ⁇ of the inner peripheral portion of the inclined wing 511 is 79 degrees, which is larger than that of the outer peripheral portion, but the distance D between the wings is approximately 31 mm, which is smaller than the outer peripheral portion.
  • the precipitation efficiency is also improved in the peripheral portion almost similarly to the peripheral portion.
  • the class height h is about 159 mm, which is about 5 when 815 is removed, and the sedimentation efficiency is about 5 times that when the inclined wing 511 is not used.
  • the relationship between the inclination angle ⁇ , the distance D between the inclined wings 511, and the height H of the inclined vanes 511 used in the coagulation / sedimentation apparatus 1 according to the present embodiment can be expressed as D ⁇ tan ⁇ ⁇ 5 ⁇ H. it can. That is, although the inclination angle ⁇ increases from the outer peripheral portion to the inner peripheral portion of the inclined wing 511, the distance D between the inclined wings 511 decreases in inverse proportion to each other, and the height H of the inclined wing 511 is constant. Over the entire area of the inclined wing 511, the sedimentation efficiency is approximately constant (here, about five times).
  • the inclination angle ⁇ of the inner peripheral portion of the inclined wing 511 is 79 degrees, this angle is determined according to the diameter of the flock forming portion 4 in the apparatus. And since the diameter of the flock forming part 4 is determined from the necessary volume of the stirring part 3 and the flock forming part 4, the inclination angle of the inner peripheral part of the inclined wing 511 may differ depending on the device depending on the difference of the required volume. .
  • the constitution of the coagulating and settling apparatus 1 as described above it is possible to provide a coagulating and settling means that exhibits excellent settling efficiency without requiring a power source even in a narrow space.
  • FIG. 5A, FIG. 5B and FIG. 5C are figures showing the modification of the coagulation-sedimentation apparatus 1.
  • FIG. The flocculating and settling apparatus 1 according to the present modification has many features in common with the flocculating and settling apparatus 1 of the first embodiment. Therefore, the same reference numerals are given to such places and the detailed description is omitted. Do.
  • FIG. 5A is a view showing an outline of the internal configuration of the coagulating and settling apparatus 1 according to the present modification
  • FIG. 5B is a plan view of the water collecting plate 71 of the flocculating and settling apparatus 1 according to the present modification.
  • the coagulating and settling apparatus 1 according to the present modification is provided with a water collecting plate 71 having the same diameter as the outer diameter of the inclined wing portion 51 instead of the flow separating plate 61.
  • a plurality of water collecting holes 72 penetrating in the thickness direction are arranged at equal intervals in the circumferential direction, and are further arranged in a plurality of rows arranged in the radial direction. Water to be treated flows into the treated water outlet 6 through the water hole 72.
  • the water to be treated that has passed through the precipitation separation unit 5 can rapidly enter the treated water outlet unit 6 without detouring from the evenly arranged route, so that the treatment efficiency of the entire apparatus Can be prevented.
  • FIG. 5C is a perspective view of the five flow straightening plates 73.
  • the flow straightening plate 73 is formed by forming a plate-like member in an annular shape, and five straight flow straightening plates 73 having different diameters are coaxial with the coagulation sedimentation device 1. It is arranged. Further, the heights of the five flow straightening plates 73 are also different, and are arranged in order from the lower side from the inner peripheral portion to the outer peripheral portion of the device.
  • the water to be treated which has flowed out of the flock forming portion 4 can make the flow toward the inclined wing portion 51 upward more smoothly.
  • FIGS. 6 and 7 are diagram showing a water purification system according to the present embodiment.
  • raw water was taken by the water intake facility 81, and this was pumped to the water receiving well 82 of the water purification plant by the pump 90 and the water flow was once stabilized at the water receiving well 82.
  • the coagulant and the raw water are rapidly stirred and mixed in the medicine mixing reservoir 83, the raw water mixed with the coagulant in the flocculation reservoir 84 is slowly stirred to form the floc, and the settling reservoir 85 is further formed.
  • a flocculation process was carried out.
  • the treated water after coagulation sedimentation is further sent to filter pond 86 by means of pump 90 or the like, filtered there and then chlorinated in water purifier 87, and then stored in reservoir 88 and distributed from each water pipe 89 It is a flow of distributing water to users.
  • replacing with a pump and providing a difference in elevation is generally performed.
  • a pressure type coagulating and settling apparatus 101 provided with a stirring section, a flock forming section, and a settling section including inclined plates in a pressure vessel
  • a pressure type filtration device 102 provided with a filtration member inside.
  • the raw water collected by the water collection facility 81 is sent to the coagulating and settling apparatus 101 after the coagulant is added.
  • the coagulating and settling apparatus 101 has the same structure as that described in the first embodiment, and the description thereof is omitted.
  • the water treated in the coagulation / sedimentation apparatus 101 is sent to the pressure type filtration apparatus 102 without being opened to the atmosphere as it is, and is rapidly filtered by the filter medium in the apparatus, and then the purified water reservoir 87 (or the direct distribution reservoir 88). Water).
  • the coagulating and settling apparatus 101 and the pressure type filtration apparatus 102 are sealed, and use the primary pressure to transfer the raw water from the water intake facility to the coagulating and settling apparatus 101 to feed the treated water to each subsequent step. It is possible to eliminate the need for separate measures for water supply. In addition, since each device is in a sealed state, it is not affected by disturbance in each process in the device. Furthermore, each device can be designed compactly, and the installation location can be determined relatively freely.
  • the water purification system 100 can be designed to save space, and the efficiency of the water purification system can be improved.
  • the material of the inclined wing is a stainless steel plate, but another metal plate may be used, or a resin such as polypropylene or polyvinyl chloride may be used.
  • the main body shape of the coagulating and settling apparatus 1 is a cylindrical lower portion having a conical shape, but it is not necessary to be limited to this, and other shapes may be adopted.
  • it may be a regular cylindrical shape, or it may be spherical or polygonal prismatic.
  • blade was arrange
  • the arrangement of the inclined wings is not limited to the above.
  • a plurality of inclined wings may be arranged radially with respect to the intersection of diagonals in plan view of the device main body.
  • the plurality of inclined wings may be arranged radially to a position other than the center of the cross section of the device body.
  • a module in which a plurality of coagulating and settling devices (and pressure type filtering devices) are integrated in parallel may be used. In this way, it is possible to construct a water purification system having an arbitrary processing capacity without being limited to the processing capacity per device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Ce dispositif de floculation et de sédimentation 1 est un dispositif pour soumettre un liquide entrant à traiter à des processus de floculation et de sédimentation et comporte un réservoir sous pression 2 et une unité de sédimentation et de séparation 51 disposée à l'intérieur du récipient sous pression et pourvue d'une plaque inclinée 511.
PCT/JP2018/024059 2017-07-05 2018-06-25 Dispositif de floculation et de sédimentation et système de purification d'eau WO2019009128A1 (fr)

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JP2017-132222 2017-07-05
JP2017132222A JP6750774B2 (ja) 2017-07-05 2017-07-05 凝集沈澱装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54101561A (en) * 1978-01-26 1979-08-10 Souichi Nagahara Thickener
WO1990010597A1 (fr) * 1989-03-06 1990-09-20 Wiser Oy Appareil d'epuration d'eau
JP2003033606A (ja) * 2001-07-26 2003-02-04 Mikiaki Yamaguchi 廃液の固液分離装置
JP2004025111A (ja) * 2002-06-27 2004-01-29 Nippon Rensui Co Ltd 加圧型浸漬膜濾過装置
JP2013522012A (ja) * 2010-03-18 2013-06-13 エンバイロストリーム・ソリューションズ・プロプライエタリー・リミテッド モバイル水濾過ユニット

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54101561A (en) * 1978-01-26 1979-08-10 Souichi Nagahara Thickener
WO1990010597A1 (fr) * 1989-03-06 1990-09-20 Wiser Oy Appareil d'epuration d'eau
JP2003033606A (ja) * 2001-07-26 2003-02-04 Mikiaki Yamaguchi 廃液の固液分離装置
JP2004025111A (ja) * 2002-06-27 2004-01-29 Nippon Rensui Co Ltd 加圧型浸漬膜濾過装置
JP2013522012A (ja) * 2010-03-18 2013-06-13 エンバイロストリーム・ソリューションズ・プロプライエタリー・リミテッド モバイル水濾過ユニット

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JP2019013875A (ja) 2019-01-31

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