CN102863039A - Multi-bubble hybrid system for pressurizing dissolved air floatation - Google Patents
Multi-bubble hybrid system for pressurizing dissolved air floatation Download PDFInfo
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- CN102863039A CN102863039A CN2011101917512A CN201110191751A CN102863039A CN 102863039 A CN102863039 A CN 102863039A CN 2011101917512 A CN2011101917512 A CN 2011101917512A CN 201110191751 A CN201110191751 A CN 201110191751A CN 102863039 A CN102863039 A CN 102863039A
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- bubble
- releaser
- micro
- air flotation
- separation chamber
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000000926 separation method Methods 0.000 claims abstract description 40
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 238000005188 flotation Methods 0.000 claims description 35
- 239000003814 drug Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000009300 dissolved air flotation Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 11
- 239000000725 suspension Substances 0.000 description 11
- 238000005202 decontamination Methods 0.000 description 7
- 230000003588 decontaminative effect Effects 0.000 description 7
- 229940079593 drug Drugs 0.000 description 7
- 230000001174 ascending effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 206010057249 Phagocytosis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008782 phagocytosis Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
A multi-bubble hybrid system for pressurizing dissolved air floatation comprises a dissolved air releasing device and an air floatation groove and is characterized in that the dissolved air releasing device comprises a micro-bubble releaser and a large-bubble releaser; the micro-bubble releaser is arranged inside a contact chamber of the air floatation groove and close to the bottom of the contact chamber; the large-bubble releaser is arranged inside a separation chamber of the air floatation groove and close to the bottom of the separation chamber; and both the micro-bubble releaser and the large-bubble releaser are connected with a dissolved air water guide pipe. Due to the adoption of the multi-bubble hybrid system, compared with an ordinary single micro bubble, not only can the separation effect of the sewage be improved and the hydraulic retention time be reduced, but also the purification capacity of the dissolved air floatation device for the sewage can be improved.
Description
Technical Field
The invention belongs to the solid-liquid separation technology of an air floatation system in the field of water treatment, and particularly relates to a multi-bubble mixing system for pressurized dissolved air floatation.
Background
In the water treatment process, the solid-liquid separation technology is the key, and the air flotation separation technology is the most common method at present for removing the tiny suspended matters with the specific gravity close to water; the air floating equipment is water treating equipment with great amount of micro bubbles introduced or produced in water to make air adhere to suspended matter grains in high dispersed micro bubble form to result in density lower than that of water and float on water surface based on buoyancy principle. The air flotation method can be divided into dispersed air flotation, dissolved air flotation (including vacuum air flotation) and electrolytic air flotation. The pressurized dissolved air floatation process is a process of treating water by pressurized dissolved air and then by air floatation. The method is characterized in that water is input into a dissolved air tank of a special device, air is fully dissolved in the water in the tank, then the air is suddenly reduced to normal pressure in an air floatation tank through a releaser, at the moment, supersaturated air dissolved in the water escapes from the tank in the form of fine bubbles, suspended particles or oil particles in the water are brought to the water surface to form scum, and then the scum is discharged, so that the sewage is purified.
For the dissolved air release system selected by the currently common dissolved air flotation device, only one kind of micro-bubbles with similar size can be released, and the size of the released bubbles is taken as an important factor for judging the decontamination capability; because the smaller the micro-bubbles released by the releaser, the easier the micro-bubbles are combined with the micro suspended matters, and the higher the air floatation capacity is; however, such a single small bubble has some drawbacks: 1. larger suspended matters in the water can be combined with more micro bubbles, so that the use efficiency of the bubbles is reduced, the sewage purification effect is influenced, and the decontamination efficiency is also reduced; 2. the smaller the bubbles, the smaller the buoyancy, which increases the hydraulic retention time (hydraulic retention time: water treatment process term, which means the average retention time of the wastewater to be treated in the reactor), which decreases the efficiency of wastewater treatment 3, and the single type of bubble generator generates bubbles having a certain selectivity when combined with the combination in the wastewater.
Disclosure of Invention
The invention aims to provide a multi-bubble mixing system which not only improves the solid-liquid separation efficiency of sewage and reduces the hydraulic retention time, but also can improve the purification capacity of a pressurized dissolved air flotation device on the sewage.
The above purpose of the invention is realized by the following technical scheme:
a multi-bubble mixing system of pressurized dissolved air flotation comprises a dissolved air release device and an air flotation tank; the air flotation tank comprises a contact chamber and a separation chamber; a sewage inlet pipe is inserted into the side wall of the contact chamber; the dissolved air release device is arranged in the air flotation groove; the method is characterized in that: the dissolved air releasing device comprises a micro-bubble releaser and a large-bubble releaser;
the micro-bubble releaser is arranged in the contact chamber of the air flotation tank and is close to the bottom of the contact chamber;
the large bubble releaser is arranged in the separation chamber of the air flotation tank and is close to the bottom of the separation chamber;
the micro-bubble releaser and the big-bubble releaser are both connected with a dissolved gas water leading-in pipe.
The above object of the present invention can be further improved by the following technical scheme:
the micro-bubble releaser is a spherical container with a hollow inner part, and a gas-liquid leading-in hole and a jet hole are arranged on the spherical container; the gas-liquid leading-in hole is inserted into the dissolved gas water leading-in pipe; the gas-dissolving water enters the spherical container from the gas-dissolving water inlet pipe and then is sprayed out from the spraying hole.
The diameter of the bubbles released by the micro-bubble releaser is 20 to 80 microns;
the medicine feeding device comprises a medicine groove and a medicine feeding pipe; one end of the medicine inlet pipe is connected with the medicine groove, and the pipe orifice at the other end of the medicine inlet pipe is inserted into the contact chamber or the separation chamber to inject the medicine into the contact chamber or the separation chamber.
The large bubble releaser comprises a perforated pipe or a pressure reducing valve; the number of the perforated pipes or the pressure reducing valves is one or more; the diameter of the bubbles released by the large bubble releaser is millimeter or centimeter level.
And a control valve or a pressure gauge is arranged on the dissolved gas water leading-in pipe connected with the micro bubble releaser or the large bubble releaser.
And a vertical guide plate is arranged below the water surface in the air flotation tank separation chamber and close to one side of the contact chamber, and the guide plate can move up and down.
And multiple vertical pipes are arranged below the water surface of the separation chamber of the air flotation tank, and the diameter of each vertical pipe is larger than that of the bubbles released by the large bubble releaser.
A funnel-shaped bubble diffusion hopper is arranged around the top end of the arranged vertical tubes; an inverted funnel-shaped bubble collecting hopper is arranged around the bottom end of the arranged vertical pipes (23).
When the opening at the upper end of the arranged vertical pipes is arranged above the water surface of the separation chamber of the air flotation tank, the height of the arranged vertical pipes exposed out of the water surface is adjusted, so that the floating slag in the water automatically flows out of the separation chamber.
The invention has the beneficial effects that:
compared with the common single micro-bubble, the multi-bubble mixing system provided by the invention not only improves the separation efficiency of the sewage and reduces the hydraulic retention time, but also improves the purification capacity of the dissolved air flotation device on the sewage by combining the bubbles with different sizes.
Drawings
FIG. 1 is a schematic structural diagram of a multiple bubble mixing system according to an embodiment of the present invention;
wherein,
1, air flotation tank:
11 a contact chamber, 12 a separation chamber;
21 micro-bubble generator:
211 a spray hole to be sprayed with a spray hole,
22 large bubble generator, 23 vertical tube, 24 bubble diffusion hopper, 25 bubble collection hopper, 26 guide plate;
31 medicine grooves and 32 medicine inlet pipes;
4, a sewage inlet pipe; 5, a dissolved gas water leading-in pipe; 6 a control valve; 7, a pressure gauge;
the specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the multi-bubble mixing system of the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the multi-bubble mixing system of the present embodiment includes a dissolved air releasing device and an air flotation tank 1; the air flotation tank 1 comprises a contact chamber 11 and a separation chamber 12; a sewage inlet pipe 4 is arranged on the side wall of the contact chamber 11; the dissolved air release device is arranged in the air flotation tank 1;
further, the dissolved air releasing means includes a fine bubble releaser 21 and a large bubble releaser 22; the micro-bubble releaser 21 is arranged in the contact chamber 11 of the air flotation tank 1 and is close to the bottom of the contact chamber 11; the large bubble releaser 22 is arranged in the separation chamber 12 of the air flotation tank 1 and is close to the bottom of the separation chamber 11; both the micro bubble releaser 21 and the large bubble releaser 22 are connected with a dissolved gas water leading-in pipe 5; the bubbles released from the large bubble releaser 22 are larger than the bubbles released from the micro-bubble releaser 21;
further, the sewage enters the contact chamber 11 of the air flotation tank 1 from the sewage inlet pipe 4, the suspension in the sewage is combined with the bubbles released by the micro-bubble releaser 21 in the contact chamber 11 to form an air-particle combination, then the air-particle combination enters the separation chamber 12 along with the sewage, and the bubbles released by the large-bubble releaser 22 are combined with the suspension in the sewage and the air-particle combination in the separation chamber 12 and then quickly float to the surface of the sewage in the air flotation tank 1.
Preferably, the fine bubble releaser 21 is a spherical container with a hollow inner part, and the spherical container is provided with a gas-liquid leading-in hole and a jet hole 211; the gas-liquid leading-in hole is used for inserting the dissolved gas water leading-in pipe 5; the gas-dissolved water enters the spherical container through the gas-dissolved water introduction pipe 5, and is ejected from the ejection holes 211, thereby generating a large number of fine bubbles and generating a negative pressure.
Further, the bubbles released by the fine bubble releaser 21 are fine bubbles having a diameter of 20 to 80 μm;
preferably, the multiple bubble mixing system in this embodiment further includes a drug feeding device, the drug feeding device includes a drug groove 31 and a drug feeding tube 32; one end of the medicine inlet pipe 32 is connected with the medicine groove 31, and the other end of the medicine inlet pipe 32 is inserted into the contact chamber 11 or the separation chamber 12, so that the medicine is injected into the contact chamber 11 or the separation chamber 12; in this embodiment, the nozzle of the drug inlet tube 32 is inserted into the contact chamber 11;
furthermore, chemicals such as flocculating agent and the like are added into the sewage to generate flocculation reaction, so that impurities in the sewage are changed into floccules and are easier to combine with bubbles; in this embodiment, the drug feeding device can combine the micro-bubbles released by the micro-bubble releaser 21 with the drug and the suspension in the sewage, so that the combination between the micro-bubbles and the suspension is more reliable and a gas-particle combination is formed.
Preferably, in this embodiment, the large bubble releaser 22 is a perforated pipe or a pressure relief valve; the number of the perforated pipes or the pressure reducing valves is one or more; the number of the perforated pipes or the pressure reducing valves depends on factors such as the size of the air flotation tank 1, the sewage quantity, the sewage flow rate, the sewage pollution degree and the like; the large bubble releaser 22 releases large bubbles with a diameter of millimeter or centimeter.
Preferably, in an embodiment of the present invention, the dissolved gas water introducing pipe 5 to which the fine bubble releaser 21 and the large bubble releaser 22 are connected is provided with a control valve 6 or a pressure gauge 7, respectively. However, as another embodiment of the present invention, the micro bubble releaser 21 and the large bubble releaser 22 may be controlled by the same control valve 6 and the same pressure gauge 7.
Preferably, a vertical guide plate 26 is arranged below the water surface in the air flotation tank separation chamber 12 and on one side close to the air flotation tank contact chamber 11, and the guide plate 26 can move up and down; by controlling the amplitude of the up and down movement of the deflector 26, the flow velocity, direction and amount of flow of the contaminated water into the separation chamber 12 can be guided, so as to increase the contact time and amount between the large bubbles and the suspension and the combination of the gas particles.
Preferably, a plurality of vertical pipes 23 are arranged below the water surface of the separation chamber 12 of the air flotation tank, the diameter of each vertical pipe 23 is larger than that of the large bubbles released by the large bubble releaser 22, and the bubbles can float upwards through the vertical pipes 23, so that the floating speed is reduced.
Preferably, a funnel-shaped bubble diffusion hopper 24 is arranged around the top end of the vertical pipe 23 combination; an inverted funnel-shaped bubble collecting hopper 25 is arranged around the bottom end of the vertical pipe combination.
Further, the vertical pipe 23 is arranged to control the ascending path of the large bubbles, so that the throughput of the large bubbles in the same space during the ascending process is limited, and the ascending speed of the large bubbles is reduced; the phenomenon that the large bubbles fall off due to too high speed or cannot be effectively combined with the suspension in the sewage and the gas particle combination is avoided; the arrangement of the bubble collecting hopper 25 and the bubble diffusing hopper 24 can ensure that the large bubbles rise through the vertical pipe 23 as much as possible and then are uniformly dispersed on the surface of the sewage to avoid gathering; if the large bubbles are excessively gathered together, the suspension or the gas particle combination combined with the large bubbles can not effectively float to the surface of the sewage, and when the large bubbles are excessively gathered together and broken, the suspension and the gas particle combination can be remixed into the sewage; affecting the decontamination effect.
Further, when the upper end opening of the vertical pipes 23 is disposed above the water surface of the air flotation tank separation chamber 12, the height of the vertical pipes 23 exposed to the water surface is adjusted to change the flow rate of the sewage passing through the vertical pipes 23, so that a hydraulic gradient (a hydraulic gradient: a head drop per unit distance in the water-bearing layer along the water flow direction; a driving force for causing the water to flow at a constant flow rate by overcoming the friction) is formed on the water surface of the air flotation tank separation chamber 12, and the scum on the water surface (the impurities in the sewage such as the suspension combined with the large bubbles and the suspension combined with the air particles separated from the sewage) can automatically flow out of the separation chamber 12; equipment for removing dross can be omitted.
In the multi-bubble mixing system of the pressurized dissolved air flotation of the embodiment, the micro-bubble releaser 21 can generate ultra-micro bubbles, thereby improving the decontamination capability; due to the matching of the large bubble releaser 22, multiple bubbles can be generated, the selectivity of single bubble is reduced, the density of the bubbles is effectively improved, and the decontamination effect is further improved; meanwhile, the phagocytosis of the micro-bubbles by the large bubbles and the characteristic of high rising speed of the large bubbles are utilized, so that the decontamination capability is ensured, and the decontamination efficiency is improved; the medicine feeding device enables the combination of the bubbles and the suspension body in the sewage to be more reliable.
Finally, it should be noted that it will be apparent to those skilled in the art that various modifications may be made to the present invention without departing from the spirit and scope of the invention; it is intended that the present invention cover the modifications of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. A multi-bubble mixing system of pressurized dissolved air flotation comprises a dissolved air release device and an air flotation tank (1); the air flotation tank (1) comprises a contact chamber (11) and a separation chamber (12); a sewage inlet pipe (4) is inserted into the side wall of the contact chamber (11); the dissolved air release device is arranged in the air flotation tank (1); the method is characterized in that: the dissolved air releasing device comprises a micro-bubble releaser (21) and a large-bubble releaser (22);
the micro-bubble releaser (21) is arranged in a contact chamber (11) of the air flotation tank and is close to the bottom of the contact chamber (11);
the large bubble releaser (22) is arranged in the separation chamber (12) of the air flotation tank and is close to the bottom of the separation chamber (12);
the micro-bubble releaser (21) and the large-bubble releaser (22) are both connected with a dissolved gas water inlet pipe (5).
2. The multiple bubble mixing system of claim 1, wherein:
the micro-bubble releaser (21) is a spherical container with a hollow inner part, and a gas-liquid leading-in hole and a jet hole (211) are arranged on the spherical container; the dissolved gas water leading-in pipe (5) is inserted into the gas-liquid leading-in hole; the gas-dissolved water enters the spherical container from a gas-dissolved water inlet pipe (5) and is then ejected from an ejection hole (211).
3. The multiple bubble mixing system according to claim 1 or 2, wherein:
the diameter of the bubbles released by the micro-bubble releaser (21) is 20 to 80 microns;
4. the multiple bubble mixing system of claim 2, wherein:
the medicine feeding device comprises a medicine groove (31) and a medicine feeding pipe (32); one end of the medicine inlet pipe (32) is connected with the medicine groove (31), and the other end pipe orifice of the medicine inlet pipe (32) is inserted into the contact chamber (11) or the separation chamber (12) to inject medicine into the contact chamber (11) or the separation chamber (12).
5. The multiple bubble mixing system according to claim 1,
the large bubble releaser (22) comprises a perforated tube or a pressure relief valve; the number of the perforated pipes or the pressure reducing valves is one or more; the diameter of the bubbles released by the large bubble releaser (22) is in millimeter or centimeter.
6. The multiple bubble mixing system according to claim 2 or 5,
the dissolved gas water leading-in pipe (5) connected with the micro-bubble releaser (21) or the large-bubble releaser (22) is provided with a control valve (6) or a pressure gauge (7).
7. The multiple bubble mixing system according to claim 1,
and a vertical guide plate (26) is arranged below the water surface of the air flotation tank separation chamber (12) and on one side close to the contact chamber (11), and the guide plate (26) can move up and down.
8. The multiple bubble mixing system of claim 1, wherein:
and vertical pipes (23) which are arranged in multiple rows are arranged below the water surface of the separation chamber (12) of the air flotation tank, and the diameter of each vertical pipe (23) is larger than that of the bubbles released by the large bubble releaser (22).
9. The multiple bubble mixing system of claim 8, wherein:
a funnel-shaped bubble diffusion hopper (24) is arranged around the top end of the arranged vertical tubes (23); an inverted funnel-shaped bubble collecting hopper (25) is arranged around the bottom end of the arranged vertical pipes (23).
10. The multiple bubble mixing system of claim 8, wherein:
when the opening at the upper end of the vertical pipes (23) is arranged above the water surface of the separation chamber (12) of the air flotation tank, the height of the vertical pipes (23) exposed out of the water surface is adjusted, so that the scum in the water automatically flows out of the separation chamber (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101917512A CN102863039A (en) | 2011-07-08 | 2011-07-08 | Multi-bubble hybrid system for pressurizing dissolved air floatation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101917512A CN102863039A (en) | 2011-07-08 | 2011-07-08 | Multi-bubble hybrid system for pressurizing dissolved air floatation |
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| Publication Number | Publication Date |
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| CN102863039A true CN102863039A (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101917512A Pending CN102863039A (en) | 2011-07-08 | 2011-07-08 | Multi-bubble hybrid system for pressurizing dissolved air floatation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288161A (en) * | 2013-06-24 | 2013-09-11 | 甘肃金桥给水排水设计与工程(集团)有限公司 | Releasing device for air dissolved solution |
| CN110899004A (en) * | 2019-12-11 | 2020-03-24 | 郑州大学 | A source reduction process of non-ferrous metal solid waste based on hydraulic flotation technology |
| CN114040890A (en) * | 2019-07-04 | 2022-02-11 | 丹尼尔·特纳 | System and method for removing contaminants from a liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114040890B (en) * | 2019-07-04 | 2023-11-21 | 丹尼尔·特纳 | Systems and methods for removing contaminants from liquids |
| CN110899004A (en) * | 2019-12-11 | 2020-03-24 | 郑州大学 | A source reduction process of non-ferrous metal solid waste based on hydraulic flotation technology |
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Application publication date: 20130109 |