CN115974291A - Air intake device for pulse aeration - Google Patents
Air intake device for pulse aeration Download PDFInfo
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- CN115974291A CN115974291A CN202211641225.6A CN202211641225A CN115974291A CN 115974291 A CN115974291 A CN 115974291A CN 202211641225 A CN202211641225 A CN 202211641225A CN 115974291 A CN115974291 A CN 115974291A
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- air inlet
- air
- main body
- air intake
- inlet pipe
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- 238000005273 aeration Methods 0.000 title claims abstract description 37
- 239000012528 membrane Substances 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 238000005276 aerator Methods 0.000 abstract description 16
- 239000012530 fluid Substances 0.000 abstract description 14
- 239000010802 sludge Substances 0.000 abstract description 14
- 230000005574 cross-species transmission Effects 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 238000000108 ultra-filtration Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012510 hollow fiber Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
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- 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
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
The invention belongs to the field of membrane application in the field of water treatment, and particularly relates to an air inlet device for pulse aeration, which comprises an air inlet device, wherein the air inlet device comprises an air inlet pipe main body and a plurality of exhaust holes arranged on the air inlet pipe main body; the air inlet pipe main body is provided with a notch in the direction opposite to the exhaust hole, and the notch is provided with an extending end which is integrally formed with the air inlet pipe main body; the extending end consists of two vertical plates which are arranged oppositely; this application is through setting up the extension end of semi-open on intake pipe body, especially is fit for containing activated sludge or in the fluid that is greater than the water viscosity coefficient, under the circumstances that keeps gas pressure, retrains gaseous can not spill over in the ware of admitting air, and the structure of semi-open type can not lead to the fact the ware siltation of admitting air to block up for activated sludge etc. provides the impetus that can stop simultaneously to guarantee pulse aerator's normal operating.
Description
Technical Field
The invention belongs to the field of membrane application in the field of water treatment, and particularly relates to an air inlet device for pulse aeration.
Background
In the application technology of the prior art, an ultrafiltration membrane product and the application technology are leading and high-efficiency water treatment technologies. The device can exert the filtering and purifying effects of the surface micro-pores of the hollow fiber membrane filaments on the interception of other substances in the water body to the maximum efficiency. The water body filtered by the hollow fiber membrane has the advantages of high quality of outlet water, small projection area and the like. In order to ensure the long-time normal operation of the ultrafiltration membrane assembly, the ultrafiltration membrane assembly is subjected to periodic aeration during use, and pollutants attached to the surfaces of the membrane filaments are lifted along with the airflow to leave the surfaces of the membrane filaments and are dispersed in the water body by utilizing the pushing action of the airflow on the water body.
The higher strength air current that pulse aeration provided promotes the water, can drive the water again and rise, will spread the pollutant in the water and bring to membrane tank upper portion. But the pulse aeration is limited by the size of the pore canal for the gas to leave the gas cavity, and the air input is greatly reduced compared with the conventional continuous aeration.
In order to ensure the normal operation of the pulse aeration, the air distribution of the pulse aeration air cavities needs to be reasonably planned, so that the air inlet of each pulse aeration air cavity is uniform, and the aeration effect of the ultrafiltration membrane component is ensured.
The current air distribution mode of pulse aeration still adopts the air distribution or air inlet mode used in the original continuous aeration, namely, the same air outlet holes with certain spacing and size are manufactured on each sealed long straight round pipe or square pipe to provide air inlet/distribution for the pulse aeration. Because the conventional continuous aeration (hereinafter referred to as conventional aeration) has large gas amount and high pressure used by the ultrafiltration membrane component, the conventional gas inlet/gas distribution pipeline can be normally and uniformly provided for each ultrafiltration membrane component.
However, the air inflow/air distribution of the pulse aeration is greatly reduced due to the working mode, the air inflow/air distribution can be reduced to 1/5 of the original air inflow requirement of the conventional aeration, the air inflow/air distribution pipeline of the conventional aeration is still adopted, the air distribution is uneven, and most pulse aerators do not work or the pulse aerators continuously aerate.
On the other hand, because the fluid contains activated sludge, long straight round pipes or square pipes can be silted and blocked due to the accumulation of time. In conclusion, the membrane module cannot obtain the effect which is supposed to be achieved by aeration due to the defects, so that pollutants on the surface of membrane filaments of the membrane module are accumulated, and even the pollutants accumulated on the surface of the membrane filaments block the water inlet space on the surface of the membrane filaments in serious cases, thereby greatly influencing the popularization and application of the pulse aeration technology.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an air inlet device for pulse aeration.
In order to realize the purpose, the invention adopts the technical scheme that:
the air inlet device for pulse aeration comprises an air inlet device, wherein the air inlet device comprises an air inlet pipe main body and a plurality of exhaust holes formed in the air inlet pipe main body; the air inlet pipe main body is provided with a notch in the direction opposite to the exhaust hole, and the notch is provided with an extending end which is integrally formed with the air inlet pipe main body; the extension end is composed of two vertical plates which are arranged oppositely.
The top ends of the two vertical plates form an included angle with the centroid of the air inlet pipe main body, and the included angle is an open angle; the opening angle is 2 pi/3-pi/4, and the length of the corresponding vertical plate is 18-76mm.
The distance between adjacent exhaust holes from the starting end to the tail end is gradually increased, and the aperture of each exhaust hole is gradually increased.
Every time the distance between every two adjacent exhaust holes is increased by 10mm, the aperture of the corresponding exhaust hole is increased by 0.05-0.1mm, the initial aperture of the air inlet pipe is 5mm, and the distance between every two adjacent air inlet pipes is not less than 100mm.
The air inlet pipe main body is a round pipe or a square pipe.
The projection area of the air inlet pipe main body is not more than 3.14CM 2 (ii) a The minimum projection area of the extension end is 4.2CM 2 。
Compared with the prior art, the invention has the beneficial effects that:
this application is through setting up the extension end of semi-open on intake pipe body, especially is fit for containing activated sludge or in the fluid that is greater than the water viscosity coefficient, under the circumstances that keeps gas pressure, retrains gaseous can not spill over in the ware of admitting air, and the structure of semi-open type can not lead to the fact the ware siltation of admitting air to block up for activated sludge etc. provides the impetus that can stop simultaneously to guarantee pulse aerator's normal operating.
As a preferable form, the distance between the exhaust holes on the air inlet pipe and the hole diameter are designed so that the gas can be uniformly distributed and provided for each pulse aerator.
Drawings
FIGS. 1-3 are longitudinal sectional views, perspective views and transverse sectional views of a gas intake for pulse aeration according to an embodiment of the present application;
fig. 4-5 are schematic diagrams of the use of the air intake device for pulsed aeration according to the embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.
Fig. 1-3 show a form of an air intake device for pulse aeration, comprising an air intake device, which comprises an air intake pipe body 1 and a plurality of exhaust holes 6 arranged on the air intake pipe body; an air inlet cavity 2 is arranged in the air inlet pipe inner body; a notch is arranged on the air inlet pipe main body in the direction opposite to the exhaust hole, and an extension end 3 which is integrally formed with the air inlet pipe main body is arranged at the notch; the extending end is composed of two vertical plates which are arranged oppositely.
An included angle 7 formed by the top ends of the two vertical plates and the centroid of the air inlet pipe main body is an open angle; the opening angle is 2 pi/3-pi/4, and the length of the corresponding vertical plate is 18-76mm.
The distance between adjacent exhaust holes from the starting end to the tail end is gradually increased, and the aperture of each exhaust hole is gradually increased.
Every time the distance between every two adjacent exhaust holes is increased by 10mm, the aperture of the corresponding exhaust hole is increased by 0.05-0.1mm, the initial aperture of the air inlet pipe is 5mm, and the distance between every two adjacent air inlet pipes is not less than 100mm.
The air inlet pipe main body is a round pipe or a square pipe.
The projection area of the air inlet pipe main body is not more than 3.14CM 2 (ii) a The minimum projection area of the extension end is 4.2CM 2 。
The air inlet device 1 for pulse aeration is communicated with an air inlet pipe 9 through an air distribution pipe 10 (shown in figure 4);
the implementation principle of the application is as follows: the air inlet pipe 9 and the air inlets (hereinafter referred to as air inlets) for pulse aeration are placed in fluid, the air inlet pipe 9 is wholly filled with the fluid, along with the fact that pressurized gas gradually enters the air inlet pipe 9, the fluid level in the air inlet pipe 9 can drop and gradually enters each air inlet 1, the fluid in each air inlet 1 can be extruded by the gas in each air inlet 1, the fluid overflows the air inlets 1, the fluid level in the air inlets 1 firstly drops in an inclined mode in the air inlet cavity 2, when the fluid level drops to the lower end of the inner cavity 4 of the extension end 3, the position where the fluid cannot overflow is located, and the fluid is kept relatively stable. The pressure gas is discharged out of the air inlet pipe through the vent holes 6, along with the increase of the distance 5 between each vent hole and the initial hole (the initial Kong Juti is the vent hole closest to the inlet of the connected air distribution pipe), the aperture of each vent hole 6 is correspondingly increased, the diameter of each vent hole 6 is correspondingly increased by 0.05-0.1mm when the distance 5 is increased along the increasing trend, when the gas enters the air inlet device 1, a small part of the gas is discharged through the vent holes 6 when meeting one vent hole 6, and the gas which is not discharged can continuously advance until the next vent hole 6 reaches the tail end. After each exhaust hole 6 discharges a certain amount of gas, the gas pressure behind the exhaust hole 6 slightly changes relative to the gas pressure in front of the exhaust hole 6, the change trend is that the gas pressure is reduced, the gas output of the next exhaust hole 6 becomes smaller after the gas pressure slightly changes, under the condition that the loss of the intake pressure in the air intake device 1 cannot be changed, the gas output of the next exhaust hole 6 is increased by increasing the exhaust diameter of the next exhaust hole 6, a certain amount of gas continues to advance in the air intake device 1 after being released until the tail end of the air intake device 1, the residual gas continues to enter the air intake device 1, and along with the increase of the subsequent residual gas, the liquid level in the air intake device 1 gradually decreases until the lower end of the inner cavity 4 of the extension end 3, and dynamic balance is kept. With the discharge of the gas in the preceding exhaust hole 6, the gas pressure in the subsequent intake pipe 1 slightly decreases, and this decreased pressure has a large influence on the discharge amount of the subsequent exhaust hole 6, so that the diameter of the subsequent exhaust hole 6 needs to be increased.
The increased diameter of the vent hole 6 can make the gas be discharged from the vent hole 6 at the present time, on the other hand, the gas can make the liquid level in the air inlet pipe 1 drop to the inner cavity 4 of the extension end 3 under the pressure, the inner cavity 4 is determined by the angle 7 and the length of the vertical plate 3, the implementation principle is that after the angle 7 is increased, the air inflow and the air outflow of the whole air inlet device 1 cannot be changed, on the premise that the air inflow and the air outflow are not changed, in order to prevent the function of the inner cavity 4 from being damaged, the volume of the inner cavity 4 must be kept constant, that is, V (volume) = L (length) a (projection area), and the length of the inner cavity 4 (in the parallel direction with the air inlet pipe body) is relatively fixed for each air inlet device 1, so long as to keep the projection area of the inner cavity 4 consistent, the air inflow and outflow of the whole air inlet device 1 balanced and stable. The preferred length-angle relationship of the collocation is shown in table 1.
TABLE 1
| Open angle | Vertical plate length (mm) |
| Π/4 | 76 |
| Π/3 | 28 |
| Π/2 | 20 |
| 2Π/3 | 18 |
In order to improve the aeration efficiency, a pulse aerator 8 (shown in a schematic diagram in fig. 5) is arranged above the air inlet device 1, a membrane module is arranged above the pulse aerator 8, and the pulse aerator 8 aerates membrane filaments; when the overflowing fluid is river water or lake water and the like, because the substances which pollute the membrane module and are contained in the water body are less than sewage, the pulse aerator 8 can be of a small type (namely the pulse period is short by 3-5 seconds), and because the volume of the pulse aerator 8 is small, the air input of each aerator can be reduced to 0.6M on the premise of ensuring the normal operation of the aerator 3 the/H is even lower, when the area of the air inlet cavity 2 formed by the air inlet device 1 is increased and the air pressure is not changed, the air flow rate in the air inlet main body 2 is correspondingly reduced, and the air output of the exhaust hole 6 is reduced along with the reduction of the air flow rate, so that the pulse period of the pulse aerator 8 is increased, and the aeration frequency is influenced. In order to ensure the flow velocity (u = Q/(A1 + A2), Q is the intake air amount, A1 is the projected area of the intake cavity 2 in the direction of fig. 1, A2 is the projected area of the extension end 3 in the direction of fig. 1) and the pressure of the gas in the intake device 1, the maximum value of A1 is 3.14CM 2 In the case of (1), the minimum projection area of the extension end 3 in the direction of FIG. 1 is 4.2CM 2 The area can ensure that gas is uniformly discharged, and meanwhile, the gas can not break through the lower end of the inner cavity 4 and overflow.
If the filtering fluid is sewage containing activated sludge, the water contains a lot of pollutants for the membrane module, and the membrane filaments can intercept the activated sludge and make the activated sludge stay on the surfaces of the membrane filaments, in order to shake the activated sludge off the surfaces of the membrane filaments and make the activated sludge uniformly dispersed in the water, and the sludge concentration of part of the water is not higher due to the filtering of the hollow fiber membranes, a large pulse aerator 8 (namely the pulse period is short by 5-10 seconds) is required to be selected. As the volume of the large pulse aerator 8 is increased, the required air input is correspondingly increased, and the air output can be increased to 2M at most 3 H, the flow is increased, the pressure of the gas required to be fed is correspondingly increased, the volume of the gas feeder 1 needs to be increased under the condition of ensuring the gas inlet and outlet amount, the length of the gas feeder 1 is relatively fixed, and only the gas inlet is required to be increasedThe projected area of the air device 1 in the direction of fig. 1 balances the rise of the intake pressure. However, the air inlet 6 of the air inlet device 1 and the air flow rate are both used for uniform air inlet of each aerator and normal operation, so the length of the extension end 3 is convenient and feasible. Meanwhile, after the gas in the inner cavity 4 is instantaneously released, activated sludge or other high-viscosity pollutants enter the gas inlet device 1 slightly through siphoning, but the structural form of the inner cavity 4 does not provide a force point for the activated sludge/high-viscosity pollutants, so that the activated sludge/high-viscosity pollutants cannot be deposited at the lower end of the inner cavity 4 of the gas inlet device 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The air inlet device for pulse aeration is characterized by comprising an air inlet device, wherein the air inlet device comprises an air inlet pipe main body and a plurality of exhaust holes arranged on the air inlet pipe main body; the air inlet pipe main body is provided with a gap in the direction opposite to the exhaust hole, and the gap is provided with an extending end which is integrally formed with the air inlet pipe main body; the extension end is composed of two vertical plates which are arranged oppositely.
2. The air intake device for pulsed aeration according to claim 1, wherein the top ends of the two risers form an open angle with the centroid of the air intake tube body; the opening angle is 2 pi/3-pi/4, and the length of the corresponding vertical plate is 18-76mm.
3. The air intake for pulse aeration according to claim 1, wherein the interval between adjacent exhaust holes is gradually increased from the starting end to the ending end, and the hole diameter of the exhaust hole is gradually increased.
4. The air intake device for pulse aeration according to claim 3, wherein the aperture of the corresponding exhaust hole increases by 0.05 to 0.1mm for every 10mm increase in the distance between the adjacent exhaust holes, the starting aperture of the air intake tube is 5mm, and the distance between the adjacent air intake tubes is not less than 100mm.
5. The air intake device for pulse aeration according to claim 1, wherein the air intake tube body is a circular tube or a square tube.
6. The air intake apparatus for pulse aeration according to claim 1, wherein the projected area of the air intake main body is not more than 3.14CM 2 (ii) a The minimum projection area of the extension end is 4.2CM 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211641225.6A CN115974291B (en) | 2022-12-20 | 2022-12-20 | Air inlet device for pulse aeration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211641225.6A CN115974291B (en) | 2022-12-20 | 2022-12-20 | Air inlet device for pulse aeration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115974291A true CN115974291A (en) | 2023-04-18 |
| CN115974291B CN115974291B (en) | 2024-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211641225.6A Active CN115974291B (en) | 2022-12-20 | 2022-12-20 | Air inlet device for pulse aeration |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9435344B1 (en) * | 2012-09-12 | 2016-09-06 | Sidney T. Highnote | Liquid sealed pump |
| CN207347260U (en) * | 2017-10-09 | 2018-05-11 | 江苏南资环保股份有限公司 | One kind backwash perforation tubing loop aerator and aerator |
| DE102018111377A1 (en) * | 2017-05-14 | 2018-11-15 | Martin Stachowske | Arrangement for the aeration of liquids with a tubular aerator |
| CN110282731A (en) * | 2019-06-24 | 2019-09-27 | 三达膜科技（厦门）有限公司 | A kind of MBR membrane module root air intake structure |
-
2022
- 2022-12-20 CN CN202211641225.6A patent/CN115974291B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9435344B1 (en) * | 2012-09-12 | 2016-09-06 | Sidney T. Highnote | Liquid sealed pump |
| DE102018111377A1 (en) * | 2017-05-14 | 2018-11-15 | Martin Stachowske | Arrangement for the aeration of liquids with a tubular aerator |
| CN207347260U (en) * | 2017-10-09 | 2018-05-11 | 江苏南资环保股份有限公司 | One kind backwash perforation tubing loop aerator and aerator |
| CN110282731A (en) * | 2019-06-24 | 2019-09-27 | 三达膜科技（厦门）有限公司 | A kind of MBR membrane module root air intake structure |
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| Publication number | Publication date |
|---|---|
| CN115974291B (en) | 2024-07-09 |
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