CN208648868U - A kind of complete film group device being separated by filtration for sewage treatment film - Google Patents
A kind of complete film group device being separated by filtration for sewage treatment film Download PDFInfo
- Publication number
- CN208648868U CN208648868U CN201820795045.6U CN201820795045U CN208648868U CN 208648868 U CN208648868 U CN 208648868U CN 201820795045 U CN201820795045 U CN 201820795045U CN 208648868 U CN208648868 U CN 208648868U
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- China
- Prior art keywords
- membrane module
- central tube
- filtration
- group device
- sewage treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 27
- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 239000012528 membrane Substances 0.000 claims abstract description 103
- 238000005273 aeration Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229920006393 polyether sulfone Polymers 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 150000003503 terephthalic acid derivatives Chemical class 0.000 claims 1
- 239000010802 sludge Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 239000004695 Polyether sulfone Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940059082 douche Drugs 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 150000003504 terephthalic acids Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a kind of complete film group devices being separated by filtration for sewage treatment film, including cylindrical central tube, set stomata on central tube, central tube and the membrane module set on its outer rim rotate counterclockwise under the drive of transmission mechanism around center axis thereof；Membrane module is spliced by unit membrane module；Aeration tube is installed in central tube, aeration is carried out to the unit membrane module rotated to right above it and is washed away；Frame is arranged in central tube cylinder outer rim, and unit membrane module is set in frame, and the unit membrane module with row is connected by sealing element with supporting element；Central tube side sets collection branch pipe and water header, and every collection branch pipe is connect with the water producing pipe of unit membrane module, and collection branch pipe is in the middle part of filtration membrane.The utility model drives the membrane module being mounted on main body frame to rotate at runtime around central axis by central tube and transmission mechanism, and then is aerated using central area, realizes that membrane module is washed away without dead angle aeration, reduces and rinse air quantity and wind pressure, energy-saving.
Description
Technical field
The present invention relates to sewage treatment purification techniques fields, and in particular to a kind of for the complete of sewage water filtration separating treatment
Film group device.
Background technique
Membrane bioreactor (Membrane Bio-Reactor, MBR) is by efficient membrane separation technique and biochemical technology phase
In conjunction with Novel sewage processing technique, it can replace the secondary settling tank in traditional activated sludge process to be separated by solid-liquid separation, in biology
Keep high activity sludge concentration to reduce sewage treatment facility occupied area in reactor, and by keeping low organic sludge loading
To reduce surplus sludge volume.Membrane filtration technique can effectively realize mud-water separation after biochemical reaction, not influenced by sludge quality,
Stable effluent quality is reliable, also has preferable removal effect to bacterium and virus.
Currently, the membrane bioreactor isolation technics in China also with sewage treatment industry and market development and day crescent
Different, main MBR film group device to be used is divided into two kinds of forms of hollow-fibre membrane and plate membrane, both processing units are that fixation is put
Box assembly mode, that is, be fixed in component framework.Compressed air by the perforated pipe of component bottom enter the bottom of box into
Row aeration, component does not move when operation.The application of hollow-fibre membrane is more early, but its maximum problem is compared fiber substance
Sensitivity is easy winding fracture of wire, and pretreated more demanding to intaking, and cannot achieve on-line cleaning.During plate membrane can overcome
These problems of empty fiber membrane, but single group membrane module maximum filtering area is about 600m2, therefore number of devices is more, investment and
Occupied area is all bigger.Meanwhile larger (400~the 600L/m of flushing tolerance of traditional plate membrane2/ h), use and doughnut
The same bottom of film is aerated form, and supply gas pressure requires high (5~6m head), and energy consumption is larger, and cabinet is stood, bottom is aerated
The method of operation easily cause wash away less than local film surface dead angle, reduce the actually active discharge area of film.Further, since single film
The area of piece is larger, and collector pipe is arranged only at top side, and the resistance that catchments differs greatly, and practical film surface crosses Water l oad unevenness, easily
It causes lower part fouling membrane and blocks serious problem.Classic flat-plate film can not also be compatible with the advantages of hollow-fibre membrane backwash.This
A little problems annoying always plate membrane, so that the large-scale promotion application of this advantageous technology is extremely difficult.
Summary of the invention
Goal of the invention: the purpose of the present invention is to solve the above classic flat-plate film problem encountered, the present invention is proposed
A kind of flushing tolerance lacks that air pressure is small, low energy consumption, filtration flux is big, single group filter area is huge, it is uniform a kind of for dirt to catchment
The complete film group device of water treatment membrane filtration separation.
Technical solution: in order to achieve the goal above, it is of the present invention it is a kind of for sewage treatment film be separated by filtration at
Film group device is covered, the unit dies group device for sewage treatment includes cylindrical central tube, stomata is set on the central tube,
It central tube and is rotated counterclockwise under the drive of transmission mechanism around center axis thereof set on the membrane module of its outer rim；The membrane module
It is spliced by unit membrane module；Aeration tube is installed in central tube, the unit membrane module rotated to right above it is aerated
It washes away；The setting of central tube cylinder outer rim is used for the frame of installation unit membrane module, and unit membrane module is set in frame, with the list of row
First membrane module is connected by sealing element with supporting element；The central tube side sets collection branch pipe and water header, every branch of catchmenting
Pipe is connect by sealing element with the water producing pipe of unit membrane module, and the collector pipe of unit membrane module is located at the middle part of filtration membrane；In
The heart cylinder other side arranges that the connecting tube of aeration tube, one end are connect with the aeration tube in its central tube, the other end and outside air
Pipeline connection；The transmission mechanism of the aeration connecting tube side installation membrane module of foregoing central tube.
The unit membrane module is sector element membrane module, be installed in frame formed be surrounded on central tube outer rim,
Section is the membrane module of circular ring shape.
The section is that the membrane module of circular ring shape is uniformly set to central tube outer rim, forms whole film group cylindrical
Device.
The transmission mechanism includes driving motor, driving chain and transmission gear, and central tube is driven to rotate and then drive
Dynamic model group device is rotated around central axis, and the aeration for passing sequentially through unit membrane module right above central tube washes away area.The aeration
Pipe is located in central tube, submergence 2.4-2.6m.
The unit membrane module is pressurized layer film, and the pressurized layer film is that two membranes are plated in feltwork guide layer or so two
Side, outer side form are the poly (ether sulfone) films that pore size filter is 38nm.
Package poly terephthalic acid class is soaked compo inside the described feltwork guide layer.
The central tube is fixed by being set to the main frame of its two sides.
Frame, sealing element and the supporting element is stainless steel material.
The utility model has the advantages that a kind of complete film group device being separated by filtration for sewage treatment film of the present invention, with existing skill
Art is compared, and is had the advantage that
1. filter area is big: the utility model by using the thin laminate film material of light weight, thickness, rotating disc type mechanism
Construction and central area are aerated the complex art washed away, realize the significant increase of single group film group device filter area, single group group device
Filter area maximum reach 9216m2。
2. flushing tolerance, air pressure are small, low energy consumption: the utility model is by the way that aeration tube to be set in central tube, aeration tube pair
The unit membrane module rotated to above it carries out aeration cleaning, and film surface rinses tolerance and requires to be no more than 200/m2/ h, tolerance requirement
Small, energy consumption is greatly reduced in submergence 2.4-2.6m.
3. filter effect is stablized: membrane module provided by the utility model, pressurized layer film, outer side form are using polyether sulfone material
Matter, antifouling property is strong, has the function of impaired rear self-healing and drainage backwashing function, processing stable water outlet is good, and film surface is clear
It is good to wash effect, maintenance workload is few.
4. collection branch pipe is from unit membrane module centralized water, film surface resistance difference of catchmenting is small, the problem of zero load unevenness.
5.. safeguard simple, long service life: due to the film group device structure using rotation, membrane module is easy to former Chi Genghuan, nothing
Off-line maintenance is needed, it is easy to maintain；Filtration membrane has the function of impaired rear self-healing, the design of component fixed position all steel, portion
Part scientific structure design, long service life.
Detailed description of the invention
Fig. 1 is the main view for the complete film group device being separated by filtration for sewage treatment film；
Fig. 2 is the left view for the complete film group device being separated by filtration for sewage treatment film；
Fig. 3 is the perspective view for the complete film group device being separated by filtration for sewage treatment film；
Wherein: 1. driving motors；2. driving chain；3. transmission gear；4. main frame；5. membrane module；51. unit membrane group
Part；6. frame；7. aeration tube；8. central tube；9. collection branch pipe；10. water header.
Specific embodiment
With reference to the accompanying drawing, the present invention is furture elucidated.
Embodiment 1
A kind of complete film group device being separated by filtration for sewage treatment film as shown in Figs. 1-3, described is used at sewage
The unit dies group device of reason includes cylindrical central tube 8, and the central tube 8 is fixed by the main frame 4 for being set to its two sides,
Set stomata on the central tube 8, central tube 8 and set on its outer rim membrane module 5 under the drive of transmission mechanism around central shaft
Line rotates counterclockwise；The membrane module 5 is spliced by unit membrane module 51；
Aeration tube 7 is installed in central tube 8, aeration is carried out to the membrane module 5 rotated to right above it and is washed away；
The setting of 8 cylinder outer rim of central tube is used for the frame 6 of installation unit membrane module, and unit membrane module 51 is set in frame 6,
Unit membrane module 51 with row is connected by sealing element with supporting element；Frame 6, sealing element and the supporting element is stainless steel
Matter；
8 side of central tube sets collection branch pipe 9 and water header 10, and every collection branch pipe 9 passes through sealing element and unit
The water producing pipe of membrane module 51 connects, and the collection branch pipe 9 of unit membrane module 51 is located at the middle part of filtration membrane；
8 other side of central tube arranges that the connecting tube of aeration tube 6, one end are connect with the aeration tube 7 in its central tube 8, separately
One end is connect with external air duct；The transmission mechanism of the aeration connecting tube side installation mould group device of foregoing central tube 8.
The unit membrane module 51 is sector element membrane module 51, is installed on formation in frame 6 and is surrounded on central tube 8
Outer rim, the membrane module 5 that section is circular ring shape；The section is that the membrane module 5 of circular ring shape is uniformly set to 8 outer rim of central tube,
Form whole film group device cylindrical.
The transmission mechanism includes driving motor 1, driving chain 2 and transmission gear 3, drive central tube 8 rotate into
And mould group device is driven to rotate around central axis, the aeration for passing sequentially through unit membrane module 51 right above central tube 8 washes away area；Institute
It states aeration tube 7 to be located in central tube 8, submergence 2.4-2.6m.
The unit membrane module 51 is pressurized layer film, and the pressurized layer film is that two membranes are plated in feltwork guide layer or so two
Side, outer side form are the poly (ether sulfone) films that pore size filter is 38nm；Poly terephthalic acid is wrapped up inside the feltwork guide layer
Class is soaked compo.
In use, the driving motor 1 of transmission mechanism drives the central tube 8 for being equipped with transmission gear 3 to rotate by driving chain 2
It rotates counterclockwise, is rotated counterclockwise with central tube 8 around central axis so that driving is set to the rotation of 8 outer rim membrane module 5 of central tube；In
8 inner axis of heart cylinder installs aeration tube 7, and the aeration tube 7 is by being mounted on the connecting tube and external air duct of 8 side of central tube
Connection, the depth under water of aeration tube 7 are 2.5m；Aeration tube 7 carries out aeration punching to the unit membrane module 51 rotated to right above it
Brush；The unit membrane module 51 is sector element membrane module 51, be installed in frame 6 formed be surrounded on 8 outer rim of central tube,
Section is the membrane module 5 of circular ring shape；The section is that the membrane module 5 of circular ring shape is uniformly set to 8 outer rim of central tube, is formed whole
Body film group device cylindrical, 7 pairs of aeration tube rotations successively carry out aeration to the unit membrane module 5 right above it and wash away, realize
The film surface at comprehensive no dead angle rinses, and greatlys improve the filter area (9216m of single group film2) and processing capacity (300m3/ h),
Tolerance (200L/m required for air douche is reduced significantly2/ h) and air pressure (2.5m head), significantly reduce energy consumption.
Central tube side sets collection branch pipe 9 and water header 10, and every collection branch pipe 9 passes through sealing element and unit membrane module
51 water producing pipe connection, the collection branch pipe 9 of unit membrane module 51 is in the middle part of filtration membrane；Collection branch pipe 9 is by from unit membrane
51 center of component is catchmented, and film surface resistance difference of catchmenting is small, the problem of zero load unevenness.
Sector element membrane module 5 provided by the utility model is pressurized layer film, i.e. two membranes are plated on feltwork guide layer,
Membrane material is the strong polyether sulfone materials (PES) of antifouling property, wraps up poly- terephthaldehyde inside the feltwork guide layer
Acids is soaked compo；Single group device filter area reaches 9216m2, single group treating capacity >=300m3/ h, net flux reach as high as
35L/m2/ h, number of lines is few, and water and air distributing is uniform, and corollary equipment quantity is few, and it is convenient to manage, and processing stable water outlet is good, film
Face cleaning effect is good, and maintenance workload is few.
Preferably, installation sludge concentration probe and dissolved oxygen concentration probe in the membrane cisterna of mould group device operation, and must be mounted on
Online level monitoring meter need be arranged in the membrane cisterna of line level monitoring meter, the operation of mould group device, safe with the liquid level for controlling membrane cisterna, and with
The start and stop of this water production control pump；Sludge reflux pump, frequency control must be arranged in the membrane cisterna of mould group device operation, and sludge concentration is combined to visit
Head adjustment regurgitant volume, controls the sludge concentration of membrane cisterna；On mould group device outlet pipe, line pressure signal must be mounted on before producing water pump
Meter, the water outlet and recoil of mould group device are implemented by producing water pump (outside setting), and producing water pump needs frequency control, and by outlet pipe
Pressure signal meter adjust its running frequency and backwash operating condition.
Claims (9)
1. a kind of complete film group device being separated by filtration for sewage treatment film, it is characterised in that: including cylindrical central tube
(8), set stomata on the central tube (8), central tube (8) and set on its outer rim membrane module (5) under the drive of transmission mechanism
It is rotated counterclockwise around center axis thereof；The membrane module (5) is spliced by unit membrane module (51)；
Aeration tube (7) are installed in central tube, aeration is carried out to the unit membrane module (51) rotated to right above it and is washed away；
The setting of central tube (8) cylinder outer rim is used for the frame (6) of installation unit membrane module (51), and unit membrane module (51) is set to frame
In frame (6), the unit membrane module (51) with row is connected by sealing element with supporting element；
Central tube (8) side sets collection branch pipe (9) and water header (10), every collection branch pipe (9) by sealing element with
The water producing pipe of unit membrane module (51) connects, and the collection branch pipe (9) of unit membrane module (51) is located at the middle part of filtration membrane；
The connecting tube of aeration tube (7) is arranged in central tube (8) other side, and the aeration tube (7) in one end and its central tube (8) is even
It connects, the other end is connect with external air duct；The aeration connecting tube side of foregoing central tube (8) is installed by membrane module (5)
Transmission mechanism.
2. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1, it is characterised in that: institute
The unit membrane module (51) stated is sector element membrane module (51), be installed in frame (6) formed be surrounded on central tube outer rim,
Section is the membrane module (5) of circular ring shape.
3. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1 or 2, feature exist
In: the membrane module (5) is uniformly set to central tube outer rim, forms whole film group device cylindrical.
4. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1, it is characterised in that: institute
The transmission mechanism stated includes driving motor (1), driving chain (2) and transmission gear (3), and central tube is driven to rotate and then drive
Mould group device is rotated around central axis, and the aeration for passing sequentially through unit membrane module (51) right above central tube (8) washes away area.
5. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1, it is characterised in that: institute
It states aeration tube (7) to be located in central tube (8), submergence 2.4-2.6m.
6. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1 or 2, feature exist
In: the unit membrane module (51) is pressurized layer film, and the pressurized layer film is that two membranes are plated at left and right sides of feltwork guide layer,
Outer side form is the poly (ether sulfone) film that pore size filter is 38nm.
7. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 6, it is characterised in that: institute
Package poly terephthalic acid class is soaked compo inside the feltwork guide layer stated.
8. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1, it is characterised in that: institute
The central tube stated is fixed by the main frame (4) for being set to its two sides.
9. a kind of complete film group device being separated by filtration for sewage treatment film according to claim 1 or claim 7, feature exist
In: frame (6), sealing element and the supporting element is stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820795045.6U CN208648868U (en) | 2018-05-25 | 2018-05-25 | A kind of complete film group device being separated by filtration for sewage treatment film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820795045.6U CN208648868U (en) | 2018-05-25 | 2018-05-25 | A kind of complete film group device being separated by filtration for sewage treatment film |
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| Publication Number | Publication Date |
|---|---|
| CN208648868U true CN208648868U (en) | 2019-03-26 |
Family
ID=65779755
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820795045.6U Expired - Fee Related CN208648868U (en) | 2018-05-25 | 2018-05-25 | A kind of complete film group device being separated by filtration for sewage treatment film |
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| Country | Link |
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| CN (1) | CN208648868U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115092986A (en) * | 2022-08-26 | 2022-09-23 | 山东北华环保股份有限公司 | High-efficient environmental protection sewage treatment plant |
| CN117964049A (en) * | 2024-03-29 | 2024-05-03 | 山东领鸿环保工程有限公司 | PTFE (polytetrafluoroethylene) membrane-based garbage leachate deep purification device and purification method thereof |
-
2018
- 2018-05-25 CN CN201820795045.6U patent/CN208648868U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115092986A (en) * | 2022-08-26 | 2022-09-23 | 山东北华环保股份有限公司 | High-efficient environmental protection sewage treatment plant |
| CN117964049A (en) * | 2024-03-29 | 2024-05-03 | 山东领鸿环保工程有限公司 | PTFE (polytetrafluoroethylene) membrane-based garbage leachate deep purification device and purification method thereof |
| CN117964049B (en) * | 2024-03-29 | 2024-06-11 | 山东领鸿环保工程有限公司 | PTFE (polytetrafluoroethylene) membrane-based garbage leachate deep purification device and purification method thereof |
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| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 215400 No. 80, beitaowan Road, Shaxi Town, Taicang City, Suzhou City, Jiangsu Province Patentee after: HUBER ENVIRONMENTAL TECHNOLOGY (CHINA) Co.,Ltd. Address before: 215400 Shaxi Town Industrial Development Zone, Taicang City, Suzhou City, Jiangsu Province Patentee before: HUBER ENVIRONMENTAL TECHNOLOGY (CHINA) Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190326 |
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| CF01 | Termination of patent right due to non-payment of annual fee |