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WO2008136665A1 - Réacteur, pompe d'injection de gaz pour cuve de réacteur, et procédé de désactivation d'un réacteur - Google Patents

Réacteur, pompe d'injection de gaz pour cuve de réacteur, et procédé de désactivation d'un réacteur Download PDF

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Publication number
WO2008136665A1
WO2008136665A1 PCT/NL2008/050262 NL2008050262W WO2008136665A1 WO 2008136665 A1 WO2008136665 A1 WO 2008136665A1 NL 2008050262 W NL2008050262 W NL 2008050262W WO 2008136665 A1 WO2008136665 A1 WO 2008136665A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
reactor
gas
lift pump
particles
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/NL2008/050262
Other languages
English (en)
Inventor
Antonius Johannes Jorna
Sjoerd Hubertus Josef Vellinga
Jelle Hendrik De Boer
Johannes Wilhelmus Wouters
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.)
Paques BV
Original Assignee
Paques BV
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 Paques BV filed Critical Paques BV
Priority to CN2008800150035A priority Critical patent/CN101687164B/zh
Publication of WO2008136665A1 publication Critical patent/WO2008136665A1/fr
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
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/20—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles with liquid as a fluidising medium
    • B01J8/22—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles with liquid as a fluidising medium gas being introduced into the liquid
    • B01J8/224—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles with liquid as a fluidising medium gas being introduced into the liquid the particles being subject to a circulatory movement
    • B01J8/226—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles with liquid as a fluidising medium gas being introduced into the liquid the particles being subject to a circulatory movement internally, i.e. the particles rotate within the vessel
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/22—Activated sludge processes using circulation pipes
    • C02F3/223—Activated sludge processes using circulation pipes using "air-lift"
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
    • C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/003—Coaxial constructions, e.g. a cartridge located coaxially within another
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a reactor comprising: • a reactor vessel provided with a fluid comprising a bed with particles having a specific weight of > 1.1 kg/dm 3 ; and
  • the gas lift pump comprising:
  • a mouthpiece for blowing in a gas such as air the open lower end of the first tube (inner tube) lying in the bed of particle material; the mouthpiece being provided at the lower end of the first tube (inner tube) in such a way that when gas is blown in, the gas blown into the first tube (inner tube) brings about a reduction in the density of the fluid in the first tube (inner tube).
  • a gas lift pump of this type consists generally of a tube having an open upper and lower end, a gas being supplied at the lower end.
  • the supplied gas reduces in the tube the density (or, so to speak, specific weight) of the fluid located in the tube.
  • the fluid in the tube contains more gas than the fluid outside the tube.
  • the difference in density inside and outside the tube results in an upward flow into the tube, also known as a lift flow. This upward flow also allows the entrainment of other particles which are drawn in at the underside of the tube.
  • a known problem which occurs with a gas lift pump is that start-up thereof is rendered difficult as a result of the fact that a thick layer of settled particles is located around the lower end of the tube.
  • a thick layer of settled particles of this type impedes drawing-in of liquid because the layer of settled particles is insufficiently permeable to liquid.
  • the upward flow is then substantially determined by the amount of supplied gas, although this may not be able or may only just be able (as a result of the relatively low density of the gas m relation to the particles) to cause particles to move upward
  • a known solution to this problem is the provision of a few holes m the tube The purpose of these holes is to improve the drawmg-in of liquid, and this is possible as a result of the shorter distance between the holes and the upper side of the layer of particles.
  • the holes must be “excavated” one by one. This "excavation” takes place gradually as a result of the fact that particles are released from the holes and entrained under the influence of the gas blown into the tube. This "excavation” is accordingly relatively time-consuming Furthermore, the course of this "excavation process” is often less than optimal.
  • Another known problem which occurs m a gas lift pump is that the pump has difficulty in raising heavy particles - i e particles having a relatively high specific mass - and is accordingly less suitable or unsuitable for use in a bed comprising heavy particles.
  • the object of the present invention is to provide an improved reactor of the type described at the outset, which improved reactor allows more effective operation.
  • this object is achieved by providing a reactor comprising: • a reactor vessel provided with a fluid comprising a bed with particles having a specific weight of > 1 05 kg/dm 3 , and
  • the gas lift pump further comprising a second tube (outer tube) having an open lower end, the bottom part of the second tube (outer tube) being provided concentrically around the bottom part of the first tube (inner tube) to form a concentric channel around the bottom part of the first tube (inner tube); viewed in the vertical direction, the upper side of the second tube being lower than the upper side of the first tube; the upper side of the second tube (outer tube) being open and being located below the surface level of the fluid in the reactor; and the upper side of the second tube (inner tube) being located above the particles having a specific weight of > 1.05
  • the first tube which will be referred to in the present application also as the inner tube, is first surrounded at its bottom part by a second tube, which will also be referred to in the present application as the outer tube.
  • This outer tube produces in the bottom part of the inner tube a concentric space which is open at the underside.
  • the upper side of the outer tube is open and is located below the surface level of the fluid in the reactor.
  • the inner tube is able to draw in fluid, in particular liquid which may or may not be mixed with particles and/or gas, from the concentric space.
  • the concentric space allows a substantially unimpeded supply of fluid to the underside of the gas lift pump as a result of the fact that the upper side of the second tube (outer tube) is at rest above the layer of particles, or at least above the particles having a specific weight of > 1.05 kg/dm 3 , in particular is located above particles comprising particles having a specific weight of > 1.1 kg/dm 3 , and more particularly is located above particles comprising particles having a specific weight of > 1.25 kg/dm 3 . It is conceivable for lighter particles from among the particles to be located, when at rest, above the upper side of the second tube (outer tube).
  • the bed initially often consists entirely of particles having a relatively high specific weight (for example particles having a specific weight of > 1.5 kg/dm 3 ) such as brown coal particles, anthracite particles, pumice stone particles, etc.
  • a reactor height of 10 meters the bed then has for example initially a height of 80 cm.
  • biomass will (be able to) become deposited on these particles. The result of this is that the height of the bed, when the gas supply is switched off, will increase, for example to 1.5 meters or more, and that the specific weight of the particles (including the biomass) will decrease.
  • the particles including biomass located at the top of the bed may then have a specific weight lower than 1.25 kg/dm or even lower than 1.05 kg/dm .
  • these light particles can in this case themselves, when the gas supply is switched off, he above the upper side of the second tube (outer tube).
  • the invention also offers major advantages during normal operation, once start-up has already taken place, even if there are no excavation problems during startup
  • the gas lift pump is able to convey a larger and/or higher turbulent volume flow upward through the inner tube. This provides a number of advantages during normal operation.
  • the gas lift pump :
  • the reactor vessel thus contains a bed of particle material.
  • the particles will in this case not be suspended or scarcely be suspended or be suspended to a greater or lesser degree.
  • the upper side of the bed will, depending on whether the particles are suspended to a greater degree, be at a higher level during operation of the reactor.
  • the upper side of the bed will be at substantially the same height during operation of the reactor as when the reactor is deactivated. In both cases, the upper side of the outer tube protrudes above the bed when the reactor is inoperative. If the particles are not suspended or are scarcely suspended, the upper side of the outer tube will, almost by definition, also protrude above the bed during operation of the reactor. In the cases of suspending, whether or not the upper side of the outer tube also protrudes above the fluidized bed during operation of the reactor will depend on the degree to which the outer tube protrudes above the quiescent bed. In the latter case, it is possible both for the upper side of the outer tube to lie m the (fluidized) bed during operation of the reactor and for said upper side to lie above the (fluidized) bed during operation of the reactor.
  • the open lower end of the first tube is lower than the open lower end of the second tube (outer tube).
  • liquid which is drawn from the outer tube as a result of the lift flow will then entrain particles more effectively as a result of the fact that the outer tube does not, viewed in a horizontal direction, completely cover the lower end of the inner tube but rather leaves it partly exposed.
  • d is the diameter of the open lower end of the first tube (inner tube)
  • D is the diameter of the open lower end of the second tube (outer tube)
  • Z is the, viewed in the vertical direction, distance between the open lower end of the first tube (inner tube) and the open lower end of the second tube (outer tube)
  • 0.1 (D-d) ⁇ Z ⁇ 0.4 (D-d) is advantageous if Z has a value of approximately 0.2 (D-d).
  • d is the diameter of the open lower end of the first tube (inner tube), and where D is the diameter of the open lower end of the second tube (outer tube), the following applies: 0.5 D ⁇ d ⁇ 0.7 D.
  • d has a value of approximately 0.6 D.
  • the mouthpiece is provided below the open lower end of the first tube (inner tube) and is directed toward the interior of the first tube (inner tube) in such a way that, during operation, all of the blown-m gas is directed into the first tube (inner tube).
  • This allows a certain degree of resuspension of particles to be forced at the underside of the gas lift pump as soon as the gas stream is activated during start-up of the reactor. It also ensures that the gas blown into the concentric space does not generate any (undesirable) lift flow
  • the mouthpiece is provided in the first tube (inner tube).
  • the mouthpiece will then be provided in the interior of the bottom portion of the first tube (inner tube).
  • the excavation during start-up of the reactor can be further improved if one or more holes, which produce a fluid connection between the concentric channel and the interior of the first tube (inner tube), are provided in the wall of the first tube (inner tube) at a distance above the lower end of the second tube (outer tube). Via these holes, free drawing of fluid, in particular liquid, from the concentric channel is possible right from the beginning of start-up. Furthermore, these holes contribute during normal operation - separately from the start-up phase - to the capacity for upward conveyance, thus allowing particles having a higher specific mass to be conveyed more easily upward through the inner tube.
  • the particles comprise one or more of the following particles:
  • garnet sand can have a grain size of from 0.6 - 3 mm, with a specific weight of approximately 4.1 kg/dm 3 and a dump volume of approximately 2.3 kg/dm 3 .
  • quartz sand can have a grain size of from 0.6 -
  • the fluid comprises water.
  • the present invention relates to a method for deactivating a reactor according to the invention, wherein in a first step, in which a gas supply is maintained, the gas supply is first reduced to a level such that the particles impede the supply of liquid via the bed along the lower end of the second tube (outer tube); and wherein, in a second step following the first step, this level of gas supply or a lower level of gas supply is maintained until particles located in the second tube (outer tube) have become substantially discharged from said second tube (outer tube) to the first tube (inner tube) under the influence of the gas; wherein, m a third step following the second step, the gas supply is closed off.
  • Deactivating the reactor in this way ensures that during restarting of the reactor as few particles as possible are located in the outer tube, in particular in the concentric channel at the underside of the gas lift pump. This is achieved as a result of the fact that during the deactivation the gas supply is first lowered, so the particles settle to form a bed which substantially closes off the underside of the gas lift pump. This closure causes fluid to be drawn into the inner tube via the outer tube by way of the still remaining but less strong lift flow. This, in turn, causes particles located in the fluid in the outer tube to become discharged by way of circulation of the fluid through the outer tube. As a result of the fact that the upper side of the outer tube protrudes in this case above the bed of particles, drawing-in of new particles with the fluid via the outer tube will decrease and may be eliminated altogether.
  • both the second tube (outer tube) and the first tube (inner tube) contain substantially no particles.
  • the present invention relates to a gas lift pump for a reactor vessel provided with a fluid comprising a bed of particulate material, the gas lift pump comprising:
  • first tube inner tube which in use is arranged vertically and has an open upper side and an open lower end;
  • the mouthpiece for blowing in a gas such as air; the mouthpiece being provided at the lower end of the first tube (inner tube) in such a way that when gas is blown in during use, the gas blown into the first tube (inner tube) brings about a reduction in the density of the fluid in the first tube (inner tube), resulting in an upward lift flow of fluid into the first tube (inner tube);
  • the gas lift pump further comprising a second tube (outer tube) having an open lower end; viewed in the vertical direction, the upper side of the second tube being lower than the upper side of the first tube; the bottom part of the second tube (outer tube) being provided concentrically around the bottom part of the first tube (inner tube) to form a concentric channel around the bottom part of the first tube (inner tube); and the upper side of the second tube (outer tube) being open in such a way that at the upper side of the second tube (outer tube) fluid can be drawn in as a result of suction caused by the upward lift flow through the first tube (
  • Figure 1 is a schematic view of a first reactor according to the invention at the beginning of the start-up phase
  • Figure 2 is a corresponding schematic view, the start-up phase being at a more advanced stage
  • Figure 3 is a corresponding view, the first reactor being in a normal phase of operation
  • Figure 4 is a corresponding view, the first reactor being in a deactivation phase
  • Figure 5 is a schematic view of a second reactor according to the invention during normal operation.
  • the first application ( Figures 1-4) relates to the activation (once the gas supply has been terminated) of what is known as an airlift reactor such as that sold by the Applicant under the brand name Circox®.
  • the second application relates to the improvement during operation of the gas lift pump, as a result of which the principle of the gas lift pump may readily be applied to a bed comprising relatively heavy particles, such as in a sand bed filter comprising, for example, garnet sand.
  • reference numeral 10 denotes a first reactor according to the invention.
  • This reactor vessel contains a fluid, the upper surface of which, also known as the liquid level, is denoted by reference numeral 18.
  • the fluid comprises a bed with particles 17 which are schematically illustrated as being triangular.
  • the upper side of the bed is denoted schematically by reference numeral 19.
  • This first reactor is of the type in which the bed of particles is fluidized during operation. This is, by way of example, a bed comprising biomass-carrying particles.
  • a gas lift pump is located m the reactor vessel 10.
  • This gas lift pump comprises an inner tube 11 and an outer tube 12 placed concentrically around said inner tube.
  • the inner tube 11 and the outer tube 12 jointly delimit a concentric channel 21.
  • This concentric channel 21 extends, m particular, along the bottom part of the inner tube 11.
  • the lower end 15 of the outer tube 12 is, viewed in the vertical direction, higher than the lower end 14 of the inner tube 11.
  • air bubbles are illustrated schematically as circles and denoted by reference numeral 16.
  • Figure 1 shows that the bed of particle material, when this reactor is deactivated and the fluid is at rest, has precipitated to form a relatively compact bed of particles.
  • This precipitated, relatively compact bed of particles closes off the underside of the gas lift pump.
  • the upper end of the outer tube 12 protrudes above the upper side 19 of the bed in this rest state.
  • gas such as air
  • fluid in particular liquid
  • the gas supply will, as is indicated schematically in Figure 4, first be lowered to a level such that the bed of particle material starts to thicken, wherein the upper side 19 of the bed will usually descend.
  • the result of the thickening is that the particles close off the underside of the gas lift pump, as a result of which fluid can still be drawn in only via the concentric channel, delimited between the outer tube 12 and inner tube 11, as is indicated schematically in Figure 4 by arrows ⁇ and ⁇ .
  • the concentric channel 21 contains relatively few particles 17.
  • the concentric channel 21 can contain substantially no particles. This allows, on restarting, fluid to be supplied from the outset unimpeded to the inner tube 11 via the concentric channel.
  • FIG. 5 shows a second reactor 30 according to the invention
  • the sand can comprise any suitable filtering sand, although m this case it comprises in particular garnet sand such as garnet sand having a grain size of from 0.6 - 3 mm, with a specific weight of approximately 4.1 kg/dm 3 and a dump volume of approximately 2 3 kg/dm 3
  • the bed 31 is formed by a layer of sand which can be a few meters, for example 3-4 meters, thick and this bed forms a filter bed 31.
  • the liquid to be purified is usually supplied m the filter bed and then flows up through the filter bed in order in the meantime to be filtered.
  • the filter bed itself moves in the downward direction m order at the bottom of the filter bed to extract dirty sand from the bed, to return purified sand to the bed and usually to deposit this purified sand at the top of the bed.
  • a filter bed of this type little or no fluidization occurs, so the upper side 32 of the filter bed 31 is substantially invariably at the same level during operation of the reactor and when the reactor is not in use.
  • the use of a gas lift pump for keeping the filter bed moving and purifying the particles of sand is known per se.
  • the gas lift pump according to the invention is ideal for a filter bed reactor of this type (which filter bed can in accordance with the invention also consist of a material other than sand).
  • the same reference numerals have therefore been used for the gas lift pump as in Figures 1-4.
  • the gas bubbles are indicated schematically as circles 16.
  • the sand particles are indicated schematically in Figure 5 as triangles 34.
  • a cap 33 is provided below the upper end of the inner tube 11 but above the upper end of the outer tube 12. There may however also be no cap.
  • gas lift pump according to the invention in a filter bed reactor (in which no or little fiuidization occurs), such as a sand filter bed reactor, has the advantage that this gas lift pump is able to convey upward particles having a high specific weight, has a high output, and also improved washing properties. It will however be clear that these advantages (upward conveyance of particles having a high specific weight, high output, improved washing properties/mixmg properties) can also advantageously be used during normal operation of other types of reactors such as reactors in which the bed of particle material is fluidized to a greater or lesser degree. Furthermore, it will be clear that use of the gas lift pump according to the invention leads to improved start-up in the case of both filter bed reactors and other types of reactors.
  • Figures 1 -5 show that the gas supply pipe 20 terminates in the base of the reactor, so that m this case the mouthpiece (where gas streams out into the reactor) is then located in the base It will however be clear that the supply pipe 20 can also protrude above the base of the reactor and even can extend into the bottom portion of the inner pipe. In the latter case, the mouthpiece will then be in the interior of the inner tube 11.
  • the mouthpiece may, for example, be located in a range of from 50 cm below the lower end 14 of the inner tube to approximately 50 cm above the lower end of the inner tube 11; more particularly, the mouthpiece will be in a range of from 20 cm below the lower end
  • first reactor 11 first tube/inner tube
  • X vertical distance (m cm) from the upper end of the outer tube 12 to the upper end of the inner tube 11 ;
  • Y vertical distance between the lower end 14 of the inner tube 11 and the base of the reactor;
  • Z vertical distance (in cm) between the lower end 14 of the inner tube 11 and the lower end 15 of the outer tube 12;

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

Cette invention a trait à un réacteur, ainsi qu'à une pompe d'injection de gaz prévue pour ledit réacteur. Le réacteur comprend une cuve de réacteur contenant un fluide renfermant un lit de matière à particules. Le réacteur comprend par ailleurs la pompe d'injection de gaz selon l'invention, qui est installée dans la cuve de réacteur. La pompe d'injection de gaz comprend un premier cylindre vertical (cylindre intérieur) comportant un côté inférieur et un côté supérieur ouverts, ainsi qu'un embout permettant d'y injecter un gaz. Le côté inférieur ouvert du premier cylindre (cylindre intérieur) repose dans le lit de matière à particules. L'embout est prévu du côté inférieur du premier cylindre (cylindre intérieur) de telle manière que l'introduction de gaz dans le premier cylindre (cylindre intérieur) entraîne une réduction de la densité du fluide. La pompe d'injection de gaz comprend par ailleurs un second cylindre (cylindre extérieur) muni d'un côté inférieur ouvert et d'un côté supérieur ouvert. Le côté inférieur du second cylindre (cylindre extérieur) est agencé de manière concentrique autour du côté inférieur du premier cylindre (cylindre intérieur) et produit, à cet endroit, un canal concentrique.
PCT/NL2008/050262 2007-05-08 2008-04-28 Réacteur, pompe d'injection de gaz pour cuve de réacteur, et procédé de désactivation d'un réacteur Ceased WO2008136665A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008800150035A CN101687164B (zh) 2007-05-08 2008-04-28 反应器、用于反应器容器的气体提升泵、以及使反应器失活的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2000637 2007-05-08
NL2000637A NL2000637C2 (nl) 2007-05-08 2007-05-08 Reactor, gasliftpomp voor in een reactorvat, alsmede werkwijze voor het uitschakelen van een reactor.

Publications (1)

Publication Number Publication Date
WO2008136665A1 true WO2008136665A1 (fr) 2008-11-13

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PCT/NL2008/050262 Ceased WO2008136665A1 (fr) 2007-05-08 2008-04-28 Réacteur, pompe d'injection de gaz pour cuve de réacteur, et procédé de désactivation d'un réacteur

Country Status (3)

Country Link
CN (1) CN101687164B (fr)
NL (1) NL2000637C2 (fr)
WO (1) WO2008136665A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH655083A5 (en) * 1981-06-29 1986-03-27 Sulzer Ag Reaction vessel for biological waste-water purification plants
DE3916520A1 (de) * 1989-05-20 1990-11-22 Zimmer Erich Helmut Biologischer klaerreaktor nach dem aeroben/fakultativen prinzip
US5817702A (en) * 1997-05-02 1998-10-06 Exxon Research And Engineering Company Hydrocarbon synthesis catalyst slurry rejuvenation with gas disengagement
US20050242450A1 (en) * 2004-04-22 2005-11-03 A. J. Witheridge Aeration of wastewater ponds using airlift pumps

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1199877C (zh) * 2003-05-19 2005-05-04 清华大学 好氧一缺氧气浮分离生物流化复合反应器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH655083A5 (en) * 1981-06-29 1986-03-27 Sulzer Ag Reaction vessel for biological waste-water purification plants
DE3916520A1 (de) * 1989-05-20 1990-11-22 Zimmer Erich Helmut Biologischer klaerreaktor nach dem aeroben/fakultativen prinzip
US5817702A (en) * 1997-05-02 1998-10-06 Exxon Research And Engineering Company Hydrocarbon synthesis catalyst slurry rejuvenation with gas disengagement
US20050242450A1 (en) * 2004-04-22 2005-11-03 A. J. Witheridge Aeration of wastewater ponds using airlift pumps

Also Published As

Publication number Publication date
CN101687164A (zh) 2010-03-31
CN101687164B (zh) 2013-03-20
NL2000637C2 (nl) 2008-11-11

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