WO2014080854A1 - 沈殿槽及びその運転方法 - Google Patents

沈殿槽及びその運転方法 Download PDF

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Publication number
WO2014080854A1
WO2014080854A1 PCT/JP2013/080995 JP2013080995W WO2014080854A1 WO 2014080854 A1 WO2014080854 A1 WO 2014080854A1 JP 2013080995 W JP2013080995 W JP 2013080995W WO 2014080854 A1 WO2014080854 A1 WO 2014080854A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
distributor
tank body
sludge
stirring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/080995
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
哲 清水
光春 寺嶋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurita Water Industries Ltd
Original Assignee
Kurita Water Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to CN201380060580.7A priority Critical patent/CN104812456B/zh
Priority to SG11201503663SA priority patent/SG11201503663SA/en
Priority to US14/441,408 priority patent/US9649578B2/en
Publication of WO2014080854A1 publication Critical patent/WO2014080854A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B01D21/2405—Feed 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
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B01D21/2416—Liquid distributors with a plurality of feed points
    • 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
    • B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
    • B01D21/286—Means for gentle agitation for enhancing flocculation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/006—Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step

Definitions

  • the present invention relates to a sedimentation tank such as a coagulation sedimentation tank, and more particularly to a sedimentation tank having a sludge outlet on the side surface of the tank body.
  • the present invention also relates to a method for operating the settling tank.
  • sedimentation separation using a solid-liquid separation tank is generally employed as a means for separating the sludge mixture into treated water and sludge.
  • a sludge blanket filtration system that forms a sludge zone (sludge blanket layer) in the sedimentation tank in order to efficiently remove turbidity and fine SS in the sludge mixture and obtain good treated water. Is adopted.
  • Patent Documents 1 and 2 describe that floc-containing raw water is introduced from the inlet of one side surface of the tank body of the settling tank, and the concentrated sludge is discharged from the outlet of the other side surface portion of the tank body. Yes. Patent Document 2 describes that the inside of a tank is stirred with a stirring blade.
  • Patent Document 3 a net-like body is horizontally installed near the middle stage of the tank body of the settling tank, the raw water containing flock is allowed to flow into the lower side of the net body, and a sludge blanket is formed on the upper side of the net-like body.
  • Patent Document 3 describes that the sludge in the upper layer portion of the sludge blanket is caused to flow out from the outlet provided in the side surface portion of the tank body.
  • Patent Document 4 describes that floc-containing raw water is discharged from a distributor into a tank body, sludge accumulated below a sludge blanket is collected by a rake provided on the lower side of the distributor, and concentrated sludge is taken out from the center of the bottom of the tank body. Has been.
  • the side discharge system sedimentation tank that discharges the sludge of the upper sludge blanket from the tank body as shown in Patent Documents 1 to 3, has a sharp rise in the blanket interface. It has the advantage that the quality of treated water is not easily deteriorated.
  • JP 2006-75750 A JP 2000-271407 A JP-A-2005-21118 JP 10-202009
  • Patent Document 2 the inside of the tank is agitated, but in order to agitate the entire sludge blanket so that the diameter of the agitation blade is small and sufficient to prevent sludge deposition, the number of revolutions of the agitation blade is significantly increased. The floc is destroyed and the quality of the supernatant water is likely to deteriorate.
  • Patent Document 3 since the floc-containing raw water is allowed to flow into the lower side of the mesh body, it is considered that the sludge blanket on the upper side of the mesh body is less likely to deposit than Patent Document 1.
  • the reticulate body is easily clogged with flocs, and operation stability is poor.
  • the raw water passes through the non-blocked portion and rises at a high flow rate, so that the sludge blanket is partially spouted and the sludge tends to be mixed into the supernatant water.
  • the object of the present invention is to solve the above-mentioned conventional problems, to provide a sedimentation tank in which the quality of treated water is good and the operation is stable over a long period of time, and an operation method thereof.
  • the precipitation tank of the present invention includes a tank body, a distributor for introducing raw water installed in a lower part of the tank body, a stirring body provided between the bottom surface of the tank body and the distributor, A sludge outlet provided above the distributor on the side, a sludge receiving chamber connected to the sludge outlet, and a sludge discharging portion provided in the sludge receiving chamber.
  • the stirring body is installed so as to be able to turn right above the bottom surface of the tank body.
  • the tank body is cylindrical, and the swirling diameter of the stirring body is 0.6 to 0.95 times the inner diameter (diameter) of the cylindrical tank body.
  • the height of the bottom surface of the distributor with respect to the bottom surface of the tank body is preferably 1 to 30% of the height from the bottom surface of the tank body to the sludge outlet.
  • the operation method of the settling tank of the present invention is a method of operating the settling tank, wherein the stirring strength (G value) of the stirring body in the space between the bottom surface of the tank body and the bottom surface of the distributor is 5. Stirring is carried out so that the pressure becomes ⁇ 200 s ⁇ 1 .
  • the distributor has a horizontal tubular portion, horizontal to the bottom surface of the tubular portion are longitudinally liquid outlet opening is extended, the tank body of the liquid specific gravity d 1 and the supply to the distributor
  • the difference from the specific gravity d 2 is preferably 0.0001 to 0.1, and d 2 > d 1 is preferable.
  • the floc-containing raw water is introduced from the distributor to the lower part or the bottom of the tank body, and is stirred by the stirring body to grow the floc, and this floc (sludge) is received from the outlet on the tank body side. And is discharged from the sludge discharge section of the receiving chamber.
  • this stirring body since this stirring body is disposed between the distributor and the bottom surface of the tank body, sludge accumulation and retention at the bottom of the tank body is prevented. For this reason, it is prevented that sludge stays in a tank body bottom part over a long period of time and rots or ferments. For this reason, the rise of sludge due to adhesion of methane gas, hydrogen sulfide gas or the like is prevented, and the quality of the treated water is improved over a long period.
  • the tank body is cylindrical, and the swirling diameter of the stirring body is increased to 0.6 to 0.95 times the inner diameter (diameter) of the tank body, so that sludge can be more reliably prevented from remaining on the entire bottom surface of the tank body. .
  • the height of the distributor bottom surface
  • the installation height of the stirring body below the distributor is also lowered, and sludge retention near the bottom of the tank body is more reliably prevented.
  • the distributor has a horizontal tubular portion, and a liquid outflow opening is extended in the longitudinal direction on the bottom surface of the horizontal tubular portion.
  • raw water treated liquid
  • the specific gravity of the liquid in the sedimentation tank especially the specific gravity of the sludge blanket layer
  • the raw water has its specific gravity. Since the liquid is smaller than the liquid in the tank, it flows in the distributor in the longitudinal direction along the ceiling surface in the distributor, and gradually flows into the precipitation tank through the opening in the middle. Since the opening of the distributor is provided on the bottom surface of the distributor, the sludge flows out from the opening into the sedimentation tank without accumulating in the distributor.
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • FIG. 3 is a sectional view taken along line III-III in FIG. 2.
  • It is a bottom view of a distributor. It is a bottom view of the distributor of the settling tank which concerns on another embodiment. It is a bottom view of the distributor of the settling tank which concerns on another embodiment. It is a bottom view of the distributor of the settling tank which concerns on another embodiment. It is a bottom view of the distributor of the settling tank which concerns on another embodiment. It is a bottom view of the distributor of the settling tank which concerns on another embodiment. It is a graph which shows the result of an Example.
  • the sedimentation tank 1 includes a cylindrical tank body 2 with the axial direction as a vertical direction, a distributor 10 installed in a lower part (near the bottom) in the tank body 2, and an intermediate part between the side surfaces of the tank body 2. Or an outlet 3 provided at a slightly higher position, a receiving tank 4 communicating with the tank body 2 through the outlet 3, an agitator 5 provided in the tank body 2, and a tank body 2 has a treated water (supernatant water) extraction trough 6 provided at an upper portion in 2, a sludge discharge port 7 for taking out the concentrated sludge from the lower portion of the receiving tank 4, and the like.
  • the inside of the receiving tank 4 is the receiving chamber 4a.
  • the stirrer 5 is attached to a drive unit 5a such as a motor, a rotary shaft 5b that is vertically disposed in the axial center of the tank body 2, and rotated by the drive unit 5a, and a lowermost end of the rotary shaft. It has the 1st stirring body 5c and the 2nd and 3rd stirring bodies 5d and 5e attached higher than it.
  • the third stirring body 5e is provided above the second stirring body 5d.
  • each of the stirring members 5c to 5e is a paddle blade composed of blades extending in the radial direction from the rotating shaft 5b.
  • the stirring members 5c to 5e extend in the four directions of radiation, but may be in two or more directions of radiation.
  • the stirring body 5c is disposed below the distributor 10, and the stirring bodies 5d and 5e are disposed above the distributor 10.
  • the uppermost stirring body 5e is positioned below the lower edge of the outlet 3.
  • Turning diameter D 2 of the stirrer 5c ⁇ 5e is 0.6-0.95 times the inner diameter (diameter) D 1 tank body 2 which is preferably 0.8 to 0.95.
  • H 1 The height from the bottom surface of the tank body 2 to the lower edge of the outlet 3 is H 1
  • H 2 the height from the bottom surface of the tank body 2 to the bottom surface of the stirring body 5c
  • H 2 is preferably not more than 5% of H 1, and more preferably 3% or less.
  • H 2 is preferably 10 mm or more.
  • the height H 4 from the bottom surface of the distributor 10 to the top surface of the stirring member 5c is preferably 20% or less of H 3 , and more preferably 10% or less.
  • H 4 is preferably 10 mm or more.
  • the distributor 10 has a square frame shape in plan view having a first side 11, a second side 12, a third side 13, and a fourth side 14 in this embodiment.
  • the sides 11 to 14 are made of a cylindrical tube, and the inside is a flow path.
  • a raw water introduction pipe 15 is connected to a portion where one end of the first side 11 and one end of the fourth side 14 are connected.
  • the raw water introduction pipe 15 extends in the extension direction of the diagonal line of the square distributor 10.
  • the outflow opening 16 extending in the longitudinal direction of each side 11 to 14 is provided on the bottom surface of each side 11 to 14 of the distributor 10.
  • one opening 16 is provided on each side 11 to 14.
  • Each opening 16 extends from the vicinity of one end of each of the sides 11 to 14 to the vicinity of the other end.
  • the opening width of the opening 16 is uniform in the longitudinal direction of each side. Therefore, each opening 16 appears as an elongated rectangular shape in FIG. 4, which is a bottom view of the distributor 10. However, both ends in the longitudinal direction of the opening 16 may be rounded.
  • Each side 11 to 14 of the distributor 10 consists of a straight cylindrical tube.
  • the opening angle (opening angle in the width direction of the opening 16 with respect to the center of the tube) ⁇ of the bottom opening 16 is 60 ° to 180 °, preferably 90 ° to 150 °.
  • the total length L 1 of each side 11 to 14 of the distributor 10 is preferably about 50 to 90%, particularly about 60 to 80% of the diameter D 1 of the tank body 2.
  • the length L 2 in the longitudinal direction of each opening 16 is (L 1 ⁇ 2 ⁇ L 3 ). In the vicinity of the corner where the sides 11 to 14 of the distributor 10 are connected to each other, the opening 16 does not exist over the range of the distance L 3 from the tip of each side 11 to 14.
  • L 3 is preferably about 1 to 3 times, particularly about 1.2 to 2 times the inner diameter (diameter) D of the tube.
  • the specific gravity of the liquid in the precipitation tank 1 in the distributor 10 (the specific gravity of the sludge blanket when the sludge blanket layer is formed in the precipitation tank 1).
  • the raw water having a specific gravity of 0.0001 to 0.1, in particular 0.0005 to 0.05, is introduced. This raw water flows along the ceiling surface in the distributor 10 and gradually flows out from the opening 16 into the sedimentation tank 1 along the way. Since the central angle ⁇ of the opening 16 is 60 to 180 °, preferably 90 to 150 °, sludge does not accumulate in the distributor 10, and the opening 16 is prevented from being blocked by sludge.
  • the distributor 10 in the vicinity of the corner portion of the distributor 10 where the sides 11, 12, sides 12, 13, and sides 13, 14 intersect each other, the distributor 10 is bent by 90 °, and in the vicinity of each corner portion, particularly in the corner portion.
  • the flow in the distributor 10 is disturbed on the downstream side. Since the branch angle between the raw water introduction pipe 15 and the sides 11 and 14 is 45 °, the flow in the distributor 10 is disturbed in this vicinity, particularly on the downstream side.
  • the range of the upstream and downstream sides respectively a distance L 3 from the corner portion is not provided with the opening 16, never raw water from Nearby flows out to the large amount of sedimentation tank 1.
  • the bent portion refers to, for example, a portion where the flow path bends 45 ° or more during a flow path length of about 5 times or less of the tube inner diameter D, or a portion where such a branch is abruptly branched.
  • the downstream side of the bent part means the downstream side of the branch part.
  • the raw water supplied from the distributor 10 into the tank body 2 is stirred by the stirring bodies 5c to 5e and is turbidized when passing through the sludge blanket S to become treated water.
  • the treated water flows out from the trough 6. Since the suspended substance is adsorbed by the flocs in the sludge blanket S, the interface of the blanket S gradually rises. When the interface reaches the height of the outlet 3, the flock in the blanket S flows out from the outlet 3 to the receiving chamber 4a.
  • the sludge that is stored and concentrated in the receiving chamber 4a is taken out from the discharge port 7.
  • the stirring by the stirring body 5c is preferably such that the stirring strength in the space from the bottom surface of the tank body 2 to the bottom surface of the distributor 10 is 5 to 200 s ⁇ 1, particularly 20 to 120 s ⁇ 1 in terms of G value.
  • G value the average speed gradient value represented by the following equation is used as an indicator of the stirring intensity of the stirring and mixing by the stirring blades, and is determined by the size, the number of sheets, and the number of rotations of the stirring blades.
  • the stirring by the stirring bodies 5e and 5d is preferably such that the stirring intensity in the space from the distributor 10 to the lower edge of the outlet 3 is 1 to 80 s ⁇ 1 , particularly 2 to 30 s ⁇ 1 in terms of G value. Agitation at this agitation strength promotes floc growth of the sludge blanket layer.
  • the ascending linear velocity in the tank body 2 is 5 to 60 m / hr, particularly 7 to 20 m / hr.
  • the openings 16 are continuously provided in the longitudinal direction of the sides 11 to 14, but a plurality of openings 16 may be provided per side in an intermittent manner. Even in this case, the width of each opening is uniform in the longitudinal direction of the opening. Each opening is preferably provided at equal intervals on each side.
  • the opening may be provided intermittently.
  • the raw water introduction pipe 15 is connected to the portion where the sides 11 and 14 of the distributor 10 intersect, but the raw water introduction pipe 15 is connected to the middle of one side 11 as in the distributor 10A of FIG. May be.
  • the opening 16 is not provided in the vicinity of the connecting portion between the raw water introduction pipe 15 and the side 11.
  • a square annular tube 19 connected to the side 13 via the tube 18 in the distributor 10A in FIG. .
  • An opening 16 is also provided on the lower surface of the rectangular annular tube 19. However, the opening 16 is not provided in the vicinity of the bent portion at the four corners of the rectangular annular tube 19 and in the vicinity of the connection portion of the tube 18.
  • An opening 16 is provided on the entire bottom surface of the distributor 20 except for the vicinity of the contact point between the raw water introduction pipe 15 and the distributor 20.
  • the 8 has three straight pipes 31, 32, 33 extending in three directions of radiation.
  • One of the tubes 31 is shorter than the tubes 32 and 33.
  • a raw water introduction pipe 15 is connected to the tip of the pipe 31.
  • the crossing angle of the tubes 32 and 33 is 60 °. Since the angle with respect to the flowing water direction in the branch part of the pipes 32 and 33 with respect to the pipe 31 is 30 ° and less than 45 °, the portion intersecting the pipes 31, 32 and 33 does not correspond to the bent portion. Therefore, the opening 16 is provided on the entire bottom surface of the tubes 32 and 33.
  • FIGS. 2, 5 and 8 are suitable because they are easy to manufacture.
  • the distributors 10 and 10A shown in FIGS. 2 and 5 are preferable because the raw water easily flows out from the openings 16 evenly.
  • Example 1 The raw water having the following water quality was treated using the apparatus shown in FIGS. ⁇ Raw water quality> SS concentration: 100 mg / L pH: 7.3 Specific gravity difference from the solution in the tank: 0.017 ⁇ Structure of sedimentation tank> Size: 1500mm diameter, 1500mm height Horizontal length of stirring blade: 1.35m (0.9 times the inner diameter of the tank) H 1 : 0.8 m H 2 : 0.03 m (4% of H 1 ) H 3 : 0.09 m (11% of H 1 ) H 4 : 0.015 m (17% of H 3 ) ⁇ Chemicals and amount used> Sulfuric acid band: 300 mg / L Cationic polymer: 1 mg / L (Kurita Industry Co., Ltd.
  • Example 1 As shown in FIG. 9, treated water of 50 mg / L or less was stably obtained in Example 1 for 2 days continuously, whereas Comparative Example 1 was deposited on the bottom after about 38 hours and 43 hours. The bubbles accumulated in the sludge that had been formed, and the sludge mass floated, and the quality of the treated water deteriorated to 300 mg / L. From this, it was recognized that stable treated water can be obtained by stirring the sludge under the distributor as in Example 1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
PCT/JP2013/080995 2012-11-20 2013-11-18 沈殿槽及びその運転方法 Ceased WO2014080854A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201380060580.7A CN104812456B (zh) 2012-11-20 2013-11-18 沉淀槽及其运转方法
SG11201503663SA SG11201503663SA (en) 2012-11-20 2013-11-18 Settling tank and method of operating the same
US14/441,408 US9649578B2 (en) 2012-11-20 2013-11-18 Settling tank and method of operating the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012254493A JP5799940B2 (ja) 2012-11-20 2012-11-20 沈殿槽及びその運転方法
JP2012-254493 2012-11-20

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WO2014080854A1 true WO2014080854A1 (ja) 2014-05-30

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PCT/JP2013/080995 Ceased WO2014080854A1 (ja) 2012-11-20 2013-11-18 沈殿槽及びその運転方法

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US (1) US9649578B2 (enExample)
JP (1) JP5799940B2 (enExample)
KR (1) KR20150086265A (enExample)
CN (1) CN104812456B (enExample)
MY (1) MY168521A (enExample)
SG (1) SG11201503663SA (enExample)
WO (1) WO2014080854A1 (enExample)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106267918A (zh) * 2016-09-06 2017-01-04 云南文山铝业有限公司 净水装置
CN108531370A (zh) * 2018-07-10 2018-09-14 湖北景源生物科技股份有限公司 一种用于木薯生产酒精的高温厌氧罐
CN108531369A (zh) * 2018-07-10 2018-09-14 湖北景源生物科技股份有限公司 一种用于木薯生产酒精的高温厌氧罐进料装置

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JP5900576B1 (ja) * 2014-10-24 2016-04-06 栗田工業株式会社 水処理方法及び水処理装置
JP6459716B2 (ja) * 2015-03-31 2019-01-30 住友重機械エンバイロメント株式会社 凝集沈殿処理装置
JP6582888B2 (ja) * 2015-11-02 2019-10-02 栗田工業株式会社 凝集沈殿装置
JP6183525B1 (ja) * 2016-09-23 2017-08-23 栗田工業株式会社 凝集沈澱装置
JP7025158B2 (ja) * 2017-02-24 2022-02-24 オルガノ株式会社 凝集沈殿装置
US11406919B2 (en) 2017-02-24 2022-08-09 Organo Corporation Flocculation and sedimentation apparatus

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JP2000334214A (ja) * 1999-05-27 2000-12-05 Kurita Water Ind Ltd 凝集沈殿装置
JP2005211817A (ja) * 2004-01-30 2005-08-11 Japan Organo Co Ltd 高濃度懸濁水の処理方法および装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106267918A (zh) * 2016-09-06 2017-01-04 云南文山铝业有限公司 净水装置
CN108531370A (zh) * 2018-07-10 2018-09-14 湖北景源生物科技股份有限公司 一种用于木薯生产酒精的高温厌氧罐
CN108531369A (zh) * 2018-07-10 2018-09-14 湖北景源生物科技股份有限公司 一种用于木薯生产酒精的高温厌氧罐进料装置

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CN104812456A (zh) 2015-07-29
SG11201503663SA (en) 2015-06-29
CN104812456B (zh) 2016-08-17
JP5799940B2 (ja) 2015-10-28
MY168521A (en) 2018-11-12
US20150298028A1 (en) 2015-10-22
JP2014100664A (ja) 2014-06-05
US9649578B2 (en) 2017-05-16
KR20150086265A (ko) 2015-07-27

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