CN101484393A - Silica or alumina ceramic diffuser for generating microbubbles, method for manufacturing the same and method for wastewater treatment using air- floatation process using the same - Google Patents
Silica or alumina ceramic diffuser for generating microbubbles, method for manufacturing the same and method for wastewater treatment using air- floatation process using the same Download PDFInfo
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- CN101484393A CN101484393A CNA200780025139XA CN200780025139A CN101484393A CN 101484393 A CN101484393 A CN 101484393A CN A200780025139X A CNA200780025139X A CN A200780025139XA CN 200780025139 A CN200780025139 A CN 200780025139A CN 101484393 A CN101484393 A CN 101484393A
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- ceramic diffusers
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 31
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 238000004065 wastewater treatment Methods 0.000 title abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 94
- 238000005188 flotation Methods 0.000 claims abstract description 41
- 239000002245 particle Substances 0.000 claims abstract description 22
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 239000002351 wastewater Substances 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 52
- 229960001866 silicon dioxide Drugs 0.000 claims description 26
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- 238000005273 aeration Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 14
- 239000007787 solid Substances 0.000 description 13
- 238000001354 calcination Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009300 dissolved air flotation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/022—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6021—Extrusion moulding
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/94—Products characterised by their shape
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
Silica or alumina based ceramic diffusers generate microbubbles for solid-liquid separation of pollutants in wastewater. Methods for manufacturing the diffusers and methods for wastewater treatment based onair-flotation using the diffusers are also disclosed. The ceramic diffuseris capable of achieving a particle size distribution in which the sizes of silica or alumina particles increase in the direction towards the center with particles on the surface being the smallest. Thus a small air pressure around 1 atm is capable of providing a uniform and steady stream of microbubbles for securing a rapid flotation of pollutants in wastewater. In addition, the ceramic diffuser can be used conveniently and semi -permanent Iy without maintenance problems, adding to its economic advantage. Furthermore, the enhanced productivity arising from the use of the extrusion molding process for producing the ceramic diffusers supports additional cost reduction.
Description
Technical field
The present invention relates to be used for producing the microbubble that makes the waste water solid-liquid separation of pollutants, based on the ceramic diffusers of silicon-dioxide or aluminum oxide and the method for making described scatterer.The invention still further relates to method of wastewater treatment based on the air flotation that uses described scatterer.
Background technology
Film filter separates pollutants in waste water, organism by its millipore filtration and such as the microbe granular of bacterium.Film filter is widely used in the water treatment field, relates generally to the processing of city and tap water.Yet they will often suffer highly to concentrate the infringement of the caused obstruction of pollutent.
Based on the most normal processing that is used in extra high organic waste water or the mud from the aeration tank of biological oxygen demand (BOD) and suspended solids (SS) level of the water treatment of air flotation.In air-flotation methods, dissolved air floatation (DAF) is used the most extensive.Dissolved air flotation is seen and is set forth in such as in the prior aries such as open No.10-0155482 of Korean Patent and No.10-0351111.Yet this method has himself problem.It needs the air compressor of heavy body, needs 4-5 atmospheric high pressure because supply with solution gas.It also needs big fabricating yard, and bears high working cost.
Recently, in order to overcome above-mentioned shortcoming, obtained more frequent use based on the air flotation method of microbubble.In the method, for water to be processed provides the microbubble of artificial preparation, the bubble that is produced with the supersaturation dissolved air that replaces pressurization.These microbubbles cause solid pollutant to rise to top, for example cause removing isolating solid by skimmer at last.
It is extremely important for the air-flotation methods floating solid based on microbubble to produce very tiny bubble with even velocity.Can comprise open No.10-0315903 of Korean Patent and the open No.20-0359766 of Korean utility model patent example as the prior art that forms microbubble.Yet, these inventions get involved in because of the caused maintenance issues of scatterer somewhat complex design, since use the deficiency in economic performance that high-pressure pump or pressurized tank cause problem and with the relevant limited problem of suitability of uncontrollable bubble size.
In addition, also once attempted making electricity consumption flotation (EF) method, and used battery lead plate to form microbubble in the EF method.Yet because the EF method has been used the particular electrical system as rectifier, it relates to high installation costs.They also are subjected to the puzzlement of fouling on the battery lead plate during long-time running.
Summary of the invention
For addressing the above problem, the purpose of this invention is to provide and comprise the fine and close ceramic diffusers based on silicon-dioxide or aluminum oxide of ceramic particle uniformly, its ideal size distribution can guarantee to produce stable tiny bubble.Purpose of the present invention also comprises the method that the described scatterer of preparation is provided.
To achieve these goals, the invention provides the ceramic diffusers based on silicon-dioxide or aluminum oxide that can produce microbubble, be used for by the flotation separation pollutent, wherein said scatterer is incinerating silicon-dioxide or alumina powder compacts (powder compact).
Scatterer of the present invention is characterised in that it has such particle size distribution: increase from the surface to the inside, particle sizes.In one embodiment, the scatterer pore dimension of invention is 0.001 μ m～0.05 μ m.In addition, described scatterer is characterised in that it is plate-like or tubulose.Described tubulose scatterer is characterised in that it has the length of 16～100cm.
The scatterer of invention is characterised in that the formed microbubble size of described scatterer is 1～100 μ m, preferred 40～60 μ m.
The present invention also provides preparation can produce the method based on the pipe-shaped ceramic diffuser of silicon-dioxide or aluminum oxide of microbubble, comprising: the wet powder of (a) preparing silicon-dioxide or aluminum oxide; (b) to forcing machine charging wet powder; (c) at the nozzle of described forcing machine vibrator is installed; (d) use vibrator wet powder in forcing machine under pressure to apply vibration, form the product of extrusion moulding, and (e) shift out the extrusion moulding product from described nozzle, and the product of the described extrusion moulding of calcining in atmosphere furnace.
The present invention is characterised in that institute's applied pressure is 300～600 tons.
The present invention also provides preparation can produce the method based on the disc-shaped ceramic diffuser of silicon-dioxide or aluminum oxide of microbubble, comprising: the wet powder of (a) preparing silicon-dioxide or aluminum oxide; (b) fill wet powder to concave metallic mold 1; (c) fill afterwards to the wet powder insertion polyvinyl chloride film of filling; (d) on the film that inserts, fill wet powder to described concave metallic mold 1; (e) after filling for the second time, make the upper surface of wet powder of filling smooth; (f) with pressure convex metallic mold 2 is pushed described wet powder, so that the wet powder that premolding is filled; (g) use and to be placed on mould 1 and mould 2 ultrasonic vibrator 11 one of at least and under pressure, to apply vibration to preformed wet powder, form the product of moulding, and (h) shift out the product of moulding, and in atmosphere furnace, calcine described moulding product from described mould 1 and mould 2.
In one embodiment of the invention, the thickness of film is 0.25～0.5mm.In another embodiment, described ultrasonic vibrator 11 is placed on the inside of (a) described convex metallic mold 2, or (b) inside of the bearing 22 of fixing described concave metallic mold 1, or (c) described (a) and (b) each local respectively one at two places.In going back an embodiment, vibration insulator 12 be placed on (a) described ultrasonic vibrator 11 and fixing described ultrasonic vibrator 11 described bearing 22 near, or (b) pressurizer (press) 23 and described convex metallic mold 2 inside ultrasonic vibrator 11 near, or (c) described (a) and (b) each local each one at two places, to stop the conduction of vibration to described bearing 22 and pressurizer 23 directions.In one embodiment of the invention, shift out moulding product and comprise moving of piston by being connected to the performer of vertical shifting up and down.In addition, the promotion pressure of described concave metallic mold 2 is 100～200 tons, and the described pressure that applies with vibration is 10～30 tons.
In a specific embodiment of the present invention, the temperature of described atmosphere furnace is 900 ℃～1,300 ℃.In addition, described wet powder be binder solution and described ceramic diffusers based on silicon-dioxide or the mixture of alumina powder.In another embodiment, described vibration is to apply under 20,000～25,000 hertz in frequency.
In one aspect of the invention, the method of handling waste water by air flotation is provided, the microbubble flotation pollutent that wherein said ceramic diffusers produces makes to form spissated sludge blanket on the top for the treatment of pond, forms the treated water layer in the bottom for the treatment of pond.In one embodiment, under 0.8～1.2 atmospheric pressure, realize aeration by described ceramic diffusers.
The invention effect
Because ceramic diffusers of the present invention exerts pressure along with shaking in the manufacturing processed of described scatterer, so described scatterer has the particle size distribution that silicon-dioxide or alumina powder particle size increase towards center position.Therefore, the low air pressure of about 1atm just can provide and can guarantee the even and stable microbubble stream of the rapid buoyant of pollutent in the waste water.In addition, air-flotation methods of the present invention can be as not producing fouling with the situation of battery lead plate electricity flotation.This can be so that can use ceramic diffusers of the present invention easily, and it can be semi-permanent as if no maintenance issues, increases its economic advantages thus.In addition, the raising of using the extruding forming method of invention to make the production efficiency that described ceramic diffusers brings can guarantee further to reduce cost.
Description of drawings
Fig. 1 a is depicted as the finished product photo of disc-shaped ceramic diffuser of the present invention.Fig. 1 b is depicted as the finished product photo of pipe-shaped ceramic diffuser of the present invention.Fig. 1 c is the sectional view of the disc-shaped ceramic diffuser of invention.
Fig. 2 a is depicted as the synoptic diagram of the bubble of disc-shaped ceramic diffuser generation of the present invention.Fig. 2 b is depicted as the photo of the bubble of disc-shaped ceramic diffuser generation of the present invention.Fig. 2 c is depicted as the synoptic diagram of the bubble of pipe-shaped ceramic diffuser generation of the present invention.Fig. 2 d is depicted as the photo of the bubble of pipe-shaped ceramic diffuser generation of the present invention.
Figure 3 shows that the vertical cross section of the operation of the device of making the invention disc-shaped ceramic diffuser.
Fig. 4 a is depicted as and follows the photo of introducing the flotation results that microbubble brings out in the embodiment of the invention 1 after the mud closely.Fig. 4 b is depicted as the photo of introducing the flotation results that microbubble brings out in the embodiment of the invention 1 after the mud 5 minutes.Fig. 4 c is depicted as the photo of introducing the flotation results that microbubble brings out in the embodiment of the invention 1 after the mud 10 minutes.Fig. 4 d is depicted as the photo by the upper surface after the mud solid/liquid separation of the air flotation that uses microbubble.
Figure 5 shows that the vertical view of the battery lead plate structure of Comparative Examples 1 of the present invention.
Figure 6 shows that the photo of the same battery lead plate (right side) before the battery lead plate (left side) that contains scale deposit in the comparison Comparative Examples 1 and the incrustation.
The explanation of Reference numeral in the accompanying drawing
1: concave metallic mold
2: convex metallic mold
11: ultrasonic vibrator
12: vibration insulator
21: piston
22: bearing
23: pressurizer
31: battery lead plate
Embodiment
Below will illustrate in greater detail the present invention.
Ceramic diffusers of the present invention based on silicon-dioxide or aluminum oxide produces microbubble, so that make pollutent float to top and with its separation.Pore dimension based on the ceramic diffusers of described silicon-dioxide or aluminum oxide can be chosen as 0.001 μ m～0.05 μ m, decides according to the bubble size of wishing to produce.The size of the microbubble that described scatterer produces is 1～100 μ m, preferred 40～60 μ m.This is because the effective flotation pollutent of bigger bubble causes detergent power sharply to descend.
Ceramic diffusers of the present invention based on silicon-dioxide or aluminum oxide is preferably dish or pipe.Especially, preferred described tubulose scatterer has 16～100 centimetres length because when the invention diffuser length overshoot scope the time, it is more inhomogeneous that the pressure of the air flowing of this ceramic diffusers inside can become.
Fig. 1 a is depicted as the finished product photo of disc-shaped ceramic diffuser of the present invention.Fig. 1 b is depicted as the finished product photo of pipe-shaped ceramic diffuser of the present invention.The diameter of the disc-shaped ceramic diffuser of invention is 15.8cm.Gas inlet (center circle of Fig. 1 a) diameter of described diffuser inside passage of being used for pressurizeing is 1 inch, and thickness is 0.8cm.The external diameter of pipe-shaped ceramic diffuser is 4.0cm, and length is 18cm.Fig. 1 c is depicted as the sectional view of disc-shaped ceramic diffuser according to embodiments of the present invention.
Fig. 2 a is depicted as when being used for reactor, and disc-shaped ceramic diffuser produces the synoptic diagram of the practical situation of bubble according to embodiments of the present invention.Fig. 2 b is depicted as corresponding photo.The structure that is connected to the center of 4 plate-like scatterers is used as air passageways.Pressure by in the internal passages shown in air rising Fig. 1 c of this passage introducing produces bubble thus on the whole surface of ceramic diffusers.Fig. 2 c is depicted as the synoptic diagram of pipe-shaped ceramic diffuser according to embodiments of the present invention, has wherein shown the bubble that this scatterer produced.Fig. 2 d is depicted as corresponding photo.
Vibrator is placed on metal die or nozzle place, so as from the surface of ceramic diffusers to the center conduction vibration.This can make ceramic diffusers reach the ideal size distribution, and wherein not only silicon-dioxide or alumina particle are fine and close, and granular size increases towards center position, and lip-deep particle minimum.In addition, half-dried forming step in the ceramic diffusers manufacturing of the present invention and high-temperature calcination step can be produced the particle of evenly big or small and compact structure rule.
Figure 3 shows that and make the vertical cross section of the device operation of disc-shaped ceramic diffuser according to embodiments of the present invention.
In the manufacturing of described ceramic diffusers, highly purified silicon-dioxide or aluminum oxide free from foreign meter at first are ground into fine powder.With this powder and the aqueous solution that contains just like the organic binder bond of polyvinyl alcohol (PVA), form the wet powder that is suitable for moulding.Compare with the ceramic diffusers that silicon-dioxide makes, the ceramic diffusers that alumina powder makes applies higher air pressure relatively when requiring operation, though it can produce more tiny bubble and have superior intensity.In contrast, the ceramic diffusers that SiO 2 powder makes can be operated under low air pressure, and is therefore more economical.In addition, has enough intensity based on the scatterer of silicon-dioxide for the air flotation of wastewater sludge, even it may be not as firm based on the scatterer of aluminum oxide.Therefore, be used for carrying out solid/liquid separation when producing microbubble by air flotation, this ceramic diffusers of two types all is fit to and is complimentary to one another.
1) disc-shaped ceramic diffuser
After the wet powder production next step is to fill concave metallic mold 1 in advance with this wet powder.With thickness is that the film of 0.25～0.5mm inserts in this wet powder, and this film is made by the organic materials as polyvinyl chloride (PVC).The thickness of described film is one of decisive factor of decision ceramic diffusers total thickness.Along with the increase of ceramic diffusers thickness, need more ceramic powder, this has reduced economic benefit.Therefore, thickness is that the film of 0.25～0.5mm is preferred for optimizing the consumption of ceramics powder and the size distribution of the bubble that will produce.On this film, carry out the secondary of wet powder and fill even smooth upper surface.Convex metallic mold 2 pushed under 100～200 tons pressure with pressurizer then and carry out initial compression in the described wet powder, obtain preformed ceramic diffusers by incinerating wet powder not.When the promotion pressure of pressurizer is lower than 100 ton hours, can be because silicon-dioxide or alumina powder be suppressed insufficient bigger bubble that produces.When pressure surpasses 200 ton hours, ceramic diffusers can take place in the high-temperature molding break.Therefore, the promotion pressure of pressurizer is preferred 100～200 tons.
In the step, preformed ceramic diffusers is carried out ultrasonic vibration with the ultrasonic vibrator 11 that is placed on the pressurizer metal die below.The vibrative while, pressurizer forms final ceramic diffusers with 10～30 tons pressure extrusion.10～30 tons pressure range can make vibrator 11 support ceramic diffusers.In addition, this pressure range can make particle be evenly distributed, rather than major part spreads to the edge.Therefore, described pressure range is preferred.
By concave metallic mold 1 and convex metallic mold 2, ultrasonic vibration is conducted to its center from the surface of described ceramic diffusers.Because short grained diameter and weight in the ceramic powder component are little, it moves towards vibration source.This motion has caused granular size to increase and the size distribution of lip-deep particle minimum towards center position, has therefore obtained the ideal ceramic diffusers.Final step making at first takes out convex metallic mold 2, moves upward with back piston 21, takes out formed ceramic diffusers from concave metallic mold 1.
2) pipe-shaped ceramic diffuser
Use extrusion moulding in the manufacturing, because it is this method can per minute production reach 4 meters product, quite economical.
Forcing machine is filled ready wet powder.Vibrative ultrasonic vibrator in the time of extruding wet powder under 300～600 tons of pressure is installed at the nozzle place of forcing machine.Exceed this pressure range, powder can not uniform distribution, produces the bubble of uniform size difficulty that becomes.Therefore preferred this pressure range of the step of extrusion moulding.
After plate-like or pipe-shaped ceramic diffuser formation, be introduced in the atmosphere furnace, and under 900 ℃～1,300 ℃, calcine, obtain ceramic diffusers of the present invention.The fusible maximum limit temperature of these ceramic powder is about 1,200 ℃ for SiO 2 powder, is about 1,400 ℃ for alumina powder.Calcination can guarantee to obtain very tiny hole under high like this temperature, and this can cause obtaining tiny bubble again.Simultaneously, consider that these ceramic diffusers can be placed on the bottom of effluent settling chamber, the ceramic diffusers of these inventions should be able to stand the pressure of water in the settling tank, produces bubble, and can stand the pressure of introducing air.In the above temperature range that provides, can realize the best compacting of ceramic powder, the ceramic diffusers with desired strength is provided.Therefore, calcination is preferably carried out in giving temperature range.Actual method of calcination is not necessarily limited to specific method.
Use ultrasonic vibration can make ceramic diffusers obtain the ideal particle size distribution, even in the manufacturing of ceramic diffusers of the present invention, use more cheap coarse relatively material to replace the material of fine particle size.The frequency of such ultrasonic vibration and time length can suitably be regulated according to coating of particles and size.Under the situation at aluminum oxide or fine silica end, preferred per second vibration 20,000～25,000 time.
Now explain the present invention in detail with following specific embodiments of giving and embodiment.Following embodiment and embodiment only are used for the example illustrative purposes, are intended to be used for limiting scope of the present invention by no means.
＜embodiment 1: the air flotation that uses ceramic diffusers to produce microbubble separates 〉
Test the ability of ceramic diffusers of the present invention with 70 liters reactor by microbubble flotation pollutent.Select for use the mixed liquor suspended solid, MLSS that is used for the conventional activated sludge wastewater treatment (MLSS, about 3,000mg/L) as pollutent.Under 0.8bar pressure, air is introduced described ceramic diffusers, produce microbubble.4 disc-shaped ceramic diffuser vertically are placed on the bottom of reactor.Air flotation is carried out at about 1 meter in the underwater.
10 minutes the result of microbubble air flotation who uses ceramic diffusers of the present invention to produce expresses in Fig. 4 a～4d, has wherein observed the mud rising.As clear demonstration the among these figure, mud is introduced the about 10 minutes aeration in back and has been produced effective solid/liquid separation.
＜Comparative Examples 1: the electric flotation separation of using battery lead plate 〉
Use the ability of the microbubble flotation pollutent of aluminium or steel electrode plate electrolysis generation with 70 liters reactor test.Select for use the mixed liquor suspended solid, MLSS that is used for the conventional activated sludge wastewater treatment (about 3,000mg/L) as pollutent.The unit of the battery lead plate 31 that two rows are made of an anode and two negative electrodes is placed on the bottom of reactor, as shown in Figure 5.Air flotation is carried out at about 1 meter in the underwater.
＜experimental 1: the size of measuring the microbubble that produces 〉
Measure the size of the microbubble of embodiment 1 and Comparative Examples 1 generation.Produce the size of bubble and can determine collision efficiency, thereby influence flotation capacity through the relation between the granular size of solid/liquid separation.(LaserTrac Model PC 2400D, Hemtrac USA) measures the bubble size that produces with particle collector.
The microbubble of ceramic diffusers has the mean diameter of 51.67 ± 0.51 μ m among the embodiment 1 under 0.8bar pressure.The microbubble of battery lead plate is that 220V, electric current are that 450mA, current density are 89.52A/m at voltage in the Comparative Examples 1
2The mean diameter that has 34.43 ± 0.51 μ m down.In two embodiment, all formed the big or small microbubble that is suitable for effective air flotation.Yet, in Comparative Examples 1, incrustation on the reactor long-time running rear electrode plate, as shown in Figure 6.Fouling has reduced the efficient of battery lead plate, and this causes forming microbubble still less again, thereby has reduced the air flotation ability.
＜experimental 2: in the effluent liquid and be accumulated in the mensuration of the sludge concentration on top
Measure in embodiment 1 and the Comparative Examples 1 and be accumulated in the sludge concentration on reactor top and the sludge concentration in the reactor stream fluid by microbubble.Surperficial loading rate among two embodiment (introducing the settling tank surface-area of mud and the ratio of the sludge quantity per hour introduced) is similar, and embodiment 1 is 0.21g/cm
2Hr, Comparative Examples 1 is 0.23g/cm
2Hr.
In embodiment 1, the concentration of accumulation mud is 14,660～23,400mg/L, and the concentration in the reactor stream fluid is 3～10mg/L.In Comparative Examples 1, the accumulation mud be 18,760～26,760mg/L, effluent liquid mud be 4～10mg/L.Gu gas/ratio (A/S) (relevant with the mud flotation efficiency) is similar among two embodiment, embodiment 1 is 0.004～0.009, and Comparative Examples 1 is 0.005～0.01.In other words, a large amount of pollutents all obtain separating by air flotation in two embodiment.Yet, in Comparative Examples 1, incrustation on the reactor long-time running rear electrode plate.This causes producing less microbubble and the flotation capacity that reduces, and it shows the increase of suspended solids in the effluent liquid (SS) amount, can be up to about 90mg/L.Be difficult to reach satisfactorily draining water quality required standard under these circumstances.
As shown above, should regularly replace, to prevent that the caused flotation capacity of scale deposit descends on the battery lead plate at the situation lower electrode plate of Comparative Examples 1.This has increased the maintenance and the working cost burden of Comparative Examples 1 method therefor.In fact, be that the annual operation and maintenance cost of 100 tons/day the reactor electricity charge closes 3,543 according to the ability that comprises of Comparative Examples 1,000 won, according to the plan of changing the one-time electrode plate in per 3 months.This is according to the operation and maintenance cost of the respective reaction device of embodiment 1 about 4.5 times, is 789,000 won according to the expense of embodiment 1.
Commercial Application
Ceramic diffusers of the present invention applies vibration owing to its manufacture method is included under the pressure, its Can realize that silica or alumina particle size increase and lip-deep particle towards center position Minimum particle diameter distributes. Therefore the low air pressure of about 1atm just can provide and can guarantee dirt in the waste water Dye the even and stable microbubble stream of the rapid flotation of thing. In addition, air-flotation methods of the present invention Can be as with the situation of battery lead plate electricity flotation, not suffering fouling. This can make the pottery diffusion of invention Device uses easily, can be semi-permanent if there is not maintenance issues, has increased its economic advantages. In addition, use the extruding forming method of invention to produce the production efficiency that described ceramic diffusers is brought Raising can guarantee further to reduce cost.
Claims (20)
1, a kind of ceramic diffusers based on silicon-dioxide or aluminum oxide that can produce microbubble is used for separating the contaminated wastewater thing by air flotation, and wherein said ceramic diffusers is incinerating silicon-dioxide or alumina powder compacts.
2, the ceramic diffusers of claim 1, the particle size distribution of wherein said scatterer make described particle size increase towards the center position of ceramic diffusers, and be minimum in the lip-deep particle size of described scatterer.
3, the ceramic diffusers of claim 1, the pore dimension of wherein said scatterer are 0.001～0.05 μ m.
4, the ceramic diffusers of claim 1, wherein said ceramic diffusers is dish or pipe.
5, the ceramic diffusers of claim 1, wherein said ceramic diffusers are that length is 16～100
The pipe of cm.
6, the ceramic diffusers of claim 1, the size of the microbubble that wherein said scatterer produces is 1～100 μ m.
7, the ceramic diffusers of claim 1, the size of the microbubble that wherein said scatterer produces is 40～60 μ m.
8, a kind of preparation can produce the method based on the pipe-shaped ceramic diffuser of silicon-dioxide or aluminum oxide of microbubble, and it comprises:
(a) wet powder of preparation silicon-dioxide or aluminum oxide;
(b) to the described wet powder of forcing machine charging;
(c) at the nozzle place of described forcing machine vibrator is installed;
(d) use vibrator wet powder in forcing machine under pressure to apply vibration, to form the product of extrusion moulding; And
(e) shift out the product of extrusion moulding from described nozzle, and in atmosphere furnace, calcine the product of described extrusion moulding.
9, the method for claim 8, wherein applied pressure is 300～600 tons.
10, a kind of preparation can produce the method based on the disc-shaped ceramic diffuser of silicon-dioxide or aluminum oxide of microbubble, and it comprises:
(a) wet powder of preparation silicon-dioxide or aluminum oxide;
(b) fill described wet powder to concave metallic mold 1;
(c) after filling, in the wet powder of filling, insert polyvinyl chloride film;
(d) on the film that inserts, fill wet powder to described concave metallic mold 1;
(e) after filling for the second time, make the upper surface of wet powder of filling smooth;
(f) with pressure convex metallic mold 2 is pushed in the described wet powder, so that the wet powder that premolding is filled;
(g) use and to be placed on the ultrasonic vibrator 11 that mould 1 and mould 2 locate one of at least and under pressure, to apply vibration, form the product of moulding to preformed wet powder; And
(h) shift out the product of moulding from described mould 1 and mould 2, and in atmosphere furnace, calcine described moulding product.
11, the method for claim 10, the thickness of wherein said film are 0.25～0.5mm.
12, the method for claim 10, wherein said ultrasonic vibrator 11 is placed on the inside of (a) described convex metallic mold 2, or (b) inside of the bearing 22 of fixing described concave metallic mold 1, or (c) described (a) and (b) each local respectively one at two places.
13, the method for claim 12, wherein vibration insulator 12 be placed on (a) described ultrasonic vibrator 11 and fixing described ultrasonic vibrator 11 described bearing 22 near, or (b) pressurizer 23 and described convex metallic mold 2 inside ultrasonic vibrator 11 near, or (c) described (a) and (b) each local each one at two places, to stop vibration to described bearing 22 and pressurizer 23 conduction.
14, the method for claim 10, wherein moulding product shifts out moving of the piston 21 that comprises by being connected to the performer that can vertically move up and down.
15, the method for claim 10, the promotion pressure of wherein said convex metallic mold 2 is 100～200 tons, and the described pressure that wherein applies with vibration is 10～30 tons.
16, the method for one of claim 8～15, the temperature of wherein said atmosphere furnace are 900～1,300 ℃.
17, the method for one of claim 8～15, wherein said wet powder be binder solution and described ceramic diffusers based on silicon-dioxide or the mixture of alumina powder.
18, the method for one of claim 8～15, wherein said vibration are to apply under 20,000～25,000 hertz in frequency.
19, a kind of method of handling waste water by air flotation, the microbubble flotation pollutent that produces by the described ceramic diffusers of one of claim 1～7 wherein, make to form spissated sludge blanket, form the treated water layer in the bottom for the treatment of pond on the top for the treatment of pond.
20, the method for claim 19 wherein realizes aeration by described ceramic diffusers under 0.8～1.2 atmospheric pressure.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060070148A KR100759834B1 (en) | 2006-07-26 | 2006-07-26 | Silica or alumina ceramic membrane diffuser for generating microbubbles, manufacturing method and manufacturing device |
| KR10-2006-0070148 | 2006-07-26 | ||
| KR1020060070148 | 2006-07-26 | ||
| PCT/KR2007/000261 WO2008013349A1 (en) | 2006-07-26 | 2007-01-16 | Silica or alumina ceramic diffuser for generating microbubbles, method for manufacturing the same and method for wastewater treatment using air- floatation process using the same |
Publications (2)
| Publication Number | Publication Date |
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| CN101484393A true CN101484393A (en) | 2009-07-15 |
| CN101484393B CN101484393B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200780025139XA Expired - Fee Related CN101484393B (en) | 2006-07-26 | 2007-01-16 | Silica or alumina ceramic diffuser for generating microbubbles, method for manufacturing the same and method for wastewater treatment using air- floatation process using the same |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100759834B1 (en) |
| CN (1) | CN101484393B (en) |
| HK (1) | HK1131962A1 (en) |
| WO (1) | WO2008013349A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079577A (en) * | 2010-12-17 | 2011-06-01 | 北京机电院高技术股份有限公司 | Surface layer aerating system and method matched with effective microorganism technology for sewage treatment |
| WO2014000675A1 (en) * | 2012-06-29 | 2014-01-03 | 北京仁创科技集团有限公司 | Aeration sheet and method for preparing same |
| CN107580525A (en) * | 2015-05-11 | 2018-01-12 | 阿克沃拉技术有限公司 | For producing the apparatus and method of bubble in a liquid |
| CN111888955A (en) * | 2020-08-06 | 2020-11-06 | 浙江荣弘科技有限公司 | Micro-nano bubble generation device, air floatation device and liquid treatment method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100844141B1 (en) * | 2007-03-20 | 2008-07-04 | 한국과학기술연구원 | Silica or alumina ceramic diffuser for generating microbubbles, method for manufacturing the same and method for air-floatation using the same |
| DE102012207731A1 (en) * | 2012-05-09 | 2013-11-14 | Matan Beery | Apparatus and method for the pre-purification of water, in particular seawater |
| US9937472B2 (en) * | 2015-05-07 | 2018-04-10 | Techmetals, Inc. | Assembly operable to mix or sparge a liquid |
| KR20160132707A (en) * | 2015-05-11 | 2016-11-21 | 주식회사 코리아세라믹인터내셔날 | Diffuser for disposal plant for purifying sewage or waste water, and manfacturing method therefor |
| KR20160132708A (en) * | 2015-05-11 | 2016-11-21 | 주식회사 코리아세라믹인터내셔날 | Diffuser for disposal plant for purifying sewage or waste water, and manfacturing method therefor |
| WO2017149654A1 (en) * | 2016-03-01 | 2017-09-08 | ヒロセ・ユニエンス株式会社 | Gas introducing/retaining device, gas introducing/retaining method, and gas release head |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1332007C (en) * | 1986-08-06 | 1994-09-13 | Masahiro Fujii | Process for activated-sludge treatment of sewage or industrial waste water |
| KR0173542B1 (en) * | 1996-03-15 | 1999-02-01 | 우덕창 | Aerator having an improved foaming surface |
| KR0166437B1 (en) * | 1996-03-15 | 1999-01-15 | 우덕창 | Method for preparing porous ceramic substrate with a large surface area |
| KR200239065Y1 (en) | 2000-03-03 | 2001-09-25 | (주)엠에치엔지니어링 | Air supplying pipes for waste water disposal system |
-
2006
- 2006-07-26 KR KR1020060070148A patent/KR100759834B1/en not_active IP Right Cessation
-
2007
- 2007-01-16 WO PCT/KR2007/000261 patent/WO2008013349A1/en active Application Filing
- 2007-01-16 CN CN200780025139XA patent/CN101484393B/en not_active Expired - Fee Related
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079577A (en) * | 2010-12-17 | 2011-06-01 | 北京机电院高技术股份有限公司 | Surface layer aerating system and method matched with effective microorganism technology for sewage treatment |
| WO2014000675A1 (en) * | 2012-06-29 | 2014-01-03 | 北京仁创科技集团有限公司 | Aeration sheet and method for preparing same |
| CN107580525A (en) * | 2015-05-11 | 2018-01-12 | 阿克沃拉技术有限公司 | For producing the apparatus and method of bubble in a liquid |
| CN111888955A (en) * | 2020-08-06 | 2020-11-06 | 浙江荣弘科技有限公司 | Micro-nano bubble generation device, air floatation device and liquid treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100759834B1 (en) | 2007-10-04 |
| CN101484393B (en) | 2013-04-24 |
| HK1131962A1 (en) | 2010-02-12 |
| WO2008013349A1 (en) | 2008-01-31 |
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