CN101607757A - Foam-removing method in the Treatment of Coking Effluent and device thereof - Google Patents

Foam-removing method in the Treatment of Coking Effluent and device thereof Download PDF

Info

Publication number
CN101607757A
CN101607757A CNA2009101817150A CN200910181715A CN101607757A CN 101607757 A CN101607757 A CN 101607757A CN A2009101817150 A CNA2009101817150 A CN A2009101817150A CN 200910181715 A CN200910181715 A CN 200910181715A CN 101607757 A CN101607757 A CN 101607757A
Authority
CN
China
Prior art keywords
foam
defeated
pond
foam device
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.)
Pending
Application number
CNA2009101817150A
Other languages
Chinese (zh)
Inventor
陈伟
张国平
刘炳生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ITT Hengtong Advanced Water Treatment Shanghai Co Ltd
Original Assignee
ITT Hengtong Advanced Water Treatment Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ITT Hengtong Advanced Water Treatment Shanghai Co Ltd filed Critical ITT Hengtong Advanced Water Treatment Shanghai Co Ltd
Priority to CNA2009101817150A priority Critical patent/CN101607757A/en
Publication of CN101607757A publication Critical patent/CN101607757A/en
Pending legal-status Critical Current

Links

Images

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

Abstract

The present invention is foam-removing method and the device thereof in the Treatment of Coking Effluent, it is characterized in that foam-removing method comprises processing steps such as scraping foam, defeated foam, foam removal.Apparatus structure by scrape foam device, Aerobic Pond, defeated foam device, the foam device that disappears, separate the pond, the loopback water pump constitutes.Advantage:, adopt and scrape foam device-defeated foam device-complete foam-removing system of the foam device that disappears formation at a large amount of foams that Aerobic Pond in the Treatment of Coking Effluent produces; Scrape the foam device and adopt running type, scrape foam and return and operate steadily, detect liquid level automatically, regulate and scrape plate height, it is effective to scrape foam; Defeated foam device adopts a spiral way, can be effectively with foam output, and the abrasion-proof backing block of bottom has guaranteed the long-time running of defeated foam device; The foam device that disappears adopts high-speed centrifugal, and is simple in structure, vibrates little, easy and simple to handle, running steadily, reliably utilizes oil resistant non-woven fabrics filter screen can remove simultaneously with the effusive oils of foam, bacterium corpse, colloid, dust, and coking wastewater processing system is better worked.

Description

Foam-removing method in the Treatment of Coking Effluent and device thereof
Technical field
What the present invention relates to is foam-removing method and device thereof in a kind of Treatment of Coking Effluent, belongs to the technical field of Industrial Wastewater Treatment.
Background technology
The waste water composition that produces in the waste water that coking chemical waste water is mainly formed by the moisture in the coking coal, gas purification process, tar and the crude benzol processing is a kind of phenol, cyanogen, oil, ammonia and a large amount of difficult trade effluent of high density inorganic and organic pollutant of containing.
Present domestic Technologies of Coke Plant Wastewater Treatment is mainly biological treatment, both after ammonia still process, removing heavy oil, air supporting pre-treatment, carries out anaerobism, aerobe processing, and the part system also is connected to follow-up materialization advanced treatment.In the process that aerobe is handled, because for the aerobe oxygen supply will be carried out aeration, and in Aerobic Pond, produce a large amount of foams, method commonly used is to utilize froth breaking water to eliminate foam in the Aerobic Pond surface sprinkling, perhaps utilize defoamer to eliminate foam, these two kinds of method effects are all bad in the practice, the latter more can deepen water pollution, influence treatment effect, marquis's foam can overflow Aerobic Pond or be blown out when a lot, and take part mud out of, foam is bonded at pool wall and ground, influences the environment of sewage disposal plant area.
Summary of the invention
The present invention proposes foam-removing method and the device thereof in a kind of Treatment of Coking Effluent, and purpose is intended to overcome the bubble-related issues that Aerobic Pond produces in the existing Treatment of Coking Effluent process.One cover foam-removing system is installed on the Aerobic Pond of Treatment of Coking Effluent, is promptly utilized and scrape foam device-defeated foam device-foam device that disappears, remove the foam that the coking wastewater processing system Aerobic Pond produces.
Technical solution of the present invention: the foam-removing method in the Treatment of Coking Effluent is characterized in that this method comprises following processing step:
One, scrapes foam, coking chemical waste water (A) through pre-treatment flows into Aerobic Pond, Aeration fan is given the aerobic microbiological oxygen supply of Aerobic Pond, and the coking chemical waste water (B) after handling through aerobic biochemical flows out to subsequent disposal, and the foam that produces on the Aerobic Pond surface strikes off by scraping the foam device;
Two, defeated foam is scraped the foam that the foam device strikes off and is delivered to the foam device that disappears by defeated foam device;
Three, foam removal, the non-woven fabrics of disappear isolated foam of foam device and replacing separate filter bag (C) outward transport and handle; Isolated water flows into and separates the pond, separates the water outlet in pond and sends Aerobic Pond back to through the loopback water pump, reaches and eliminates the foamy purpose.
Despumation device in the Treatment of Coking Effluent, its structure is to scrape the top that the foam device places Aerobic Pond, defeated foam device places an end of Aerobic Pond, Despumation device, separation pond, loopback water pump place a side of Aerobic Pond, wherein the rising pipe of Despumation device inserts and separates the pond, the rising pipe that separates the pond inserts Aerobic Pond by the loopback water pump, and it is by scraping the scraper plate of the band rubber in the foam device that foam is scraped the defeated foam groove of failing in the foam device, and scraper plate is provided with level probe.
Advantage of the present invention:, adopt and scrape foam device-defeated foam device-complete foam-removing system of the foam device that disappears formation at a large amount of foams that Aerobic Pond in the Treatment of Coking Effluent produces; Scrape the foam device and adopt running type, scrape foam and return and operate steadily, detect liquid level automatically, regulate and scrape plate height, it is effective to scrape foam; Defeated foam device adopts a spiral way, can be effectively with foam output, and the abrasion-proof backing block of bottom has guaranteed the long-time running of defeated foam device; The foam device that disappears adopts high-speed centrifugal, it is simple in structure, vibrate little, easy and simple to handle, running steadily, reliably, utilize oil resistant non-woven fabrics filter screen not only to eliminate the foam that the coking wastewater processing system Aerobic Pond produces effectively, removed simultaneously with effusive oils, bacterium corpse, colloid, the dust that produces by Aerobic Pond of foam, and then made coking wastewater processing system better work.
Description of drawings
Accompanying drawing 1 is the schema of the foam-removing method in the Treatment of Coking Effluent.
Accompanying drawing 2 is system schematic of the Despumation device in the Treatment of Coking Effluent.
Accompanying drawing 3 is to scrape the synoptic diagram that the foam device moves to defeated foam device place.
Accompanying drawing 4 is the foam schematic representation of apparatus that disappear.
Coking chemical waste water, the C that coking chemical waste water, the B that A among the figure represents to flow into Aerobic Pond 6 represents to flow out Aerobic Pond 6 represent the to disappear non-woven fabrics of foam device 3 isolated foams and replacing separates filter bag; 1 expression is scraped disappear foam device, 4 expressions of foam device, the defeated foam device of 2 expressions, 3 expressions and is separated ponds, 5 expression loopback water pumps, the Aerobic Pond of 6 expression Treatment of Coking Effluent, 7 expression Aeration fans, the 8th, track termination, the 9th, and track, the 10th, wheel, the 11st, car body, the 12nd, scraper plate promotes motor, the 13rd, wheel drive motors, the 14th, level probe, the 15th, the scraper plate, the 16th of band rubber, electrical control cubicles; The 17th, defeated foam groove, the 18th, screw conveyor shaft, the 19th, abrasion-proof backing block, the 20th, carry motor, the 21st, go out the foam mouth, the 22nd, defeated foam pipe support, the 23rd, defeated foam pipeline, the 24th, defeated foam groove support, the 25th, base, the 26th, leg, the 27th, the leg outer cover, the 28th, rising pipe, the 29th, the chassis, the 30th, antirattle spring, the 31st, suspension rod, the 32nd, casing, the 33rd, bucket in the eye stainless steel with holes, the 34th, non-woven fabrics separates filter bag, the 35th, back-up ring, the 36th, inlet tube, the 37th, main shaft, the 38th, braking devices, the 39th, motor, the 40th, pulley belt, the 41st, clutch coupling.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Contrast accompanying drawing 1, coking chemical waste water A through pre-treatment flows into Aerobic Pond 6, the aerobic microbiological oxygen supply that Aeration fan 7 is given Aerobic Pond 6, flow out to subsequent disposal through the coking chemical waste water B after the aerobic biochemical processing, foam device 1 strikes off the foam that produces on Aerobic Pond 6 surfaces and through defeated foam device 2 foam is delivered to the foam device 3 that disappears by scraping, the non-woven fabrics of foam device 3 isolated foams and replacing of disappearing separates filter bag C outward transport to be handled, isolated water flows into and separates pond 4, separates the water outlet in pond 4 and sends Aerobic Pond 6 back to through loopback water pump 5.Reach and eliminate the foamy purpose.
Contrast accompanying drawing 2 is scraped the top that foam device 1 places Aerobic Pond 6, and defeated foam device 2 places an end of Aerobic Pond 6, and the foam device 3 that disappears, separation pond 4, loopback water pump 5 place the next door of Aerobic Pond 6.Scrape the track 9 of foam device 1 and establish track termination 8 at two ends to prevent that scraping foam device 1 plunges off the tracks 9, scrape on the car body 11 of foam device 1 wheel drive motors 13 is set, driving wheel 10 walks back and forth on track 9, scraper plate 15 by the band rubber scrapes foam in the defeated foam device 2 that is arranged on Aerobic Pond 6 one ends, utilize existing level probe 14 to survey liquid level automatically, promote the height of motor 12 control scraper plates 15 by scraper plate, when scraping foam device 1 and return, scraper plate 15 is mentioned simultaneously, can high-speed cruising when assurance is returned, and be located at the work of the whole froth breaking of the electrical control cubicles 16 controls system on Aerobic Pond 6 limits.Scrape foam device 1 and foam is scraped the defeated foam groove 17 that is installed on the defeated foam groove support 24, by carrying motor 20 to drive screw conveyor shaft 18 foam is sent into the foam device 3 that disappears by going out foam mouth 21 through defeated foam pipeline 23, abrasion-proof backing block 19 is installed below the screw conveyor shaft 18, and defeated foam pipeline 23 is fixed by defeated foam pipe support 22.The water outlet of foam device 3 of disappearing flow into to separate pond 4, and is transmitted back to Aerobic Pond 6 by loopback water pump 5.
Contrast accompanying drawing 3, scraping foam device 1 walks by wheel driving motor 13 driving wheels 10, by scraper plate promote motor 12 level probe 14 and scrape foam and the time variable control returned under the scraper plate 15 of elevator belt rubber, scraper plate 15 by the band rubber is scraped defeated foam groove 17 into defeated foam device 2 with foam, through the screw conveyor shaft 18 that is installed on the defeated foam groove support 24 foam delivery is walked again.Scrape the foam device and also can change chain-type into by the small rail car formula.
Contrast accompanying drawing 4; the structure of foam device 3 of disappearing is the tripod form; the chassis 29 of the whole foam device 3 that disappears is by suspension rod 31; antirattle spring 30 is suspended on the leg 26; leg 26 places on the base 25; peripheral hardware leg outer cover 27; disappear and establish back-up ring 35 spacing inlet tubes 36 on the foam device 3; foam enters the inner chamber of the foam device 3 that disappears through inlet tube 36; separating filter bag 34 high speed centrifugations through the non-woven fabrics that is supported by bucket 33 in the eye stainless steel with holes separates; with foam; oil; part mud is held back; isolated water is collected through shell 32 and chassis 29; discharge through rising pipe 28 again; motor 39 is by clutch coupling 41; pulley belt 40 drives main shaft 37 and makes bucket 33 high speed rotating in the eye stainless steel with holes, utilizes braking devices 38 can reach steady shutdown.
The working process of foam device of disappearing is: motor drives eye with holes stainless steel inner core high speed rotating; foam flows into eye stainless steel inner core with holes by the top of the foam device that disappears; the trend non-woven fabrics separates filter bag under action of centrifugal force; utilize non-woven fabrics to separate filter bag and separate foam; water sees through non-woven fabrics and separates filter bag; eye stainless steel inner core with holes; collecting the back by casing and chassis discharges; foam; oils; the bacterium corpse; colloid; dust is trapped in non-woven fabrics to be separated on the filter bag; behind the work one-period; the artificial shutdown and the rise inlet tube; take off old non-woven fabrics and separate filter bag, replace with new non-woven fabrics and separate filter bag, the next work period of beginning.
Embodiment:
Certain coke-oven plant 60m 3The foam removal transformation of Aerobic Pond in the/h Treatment of Coking Effluent
1. existing coking wastewater processing system
Certain coke-oven plant's coking chemical waste water water yield is 60m 3/ h is divided into east, two systems in west, adopts " oil removing-air supporting-electrolysis-anaerobism-double oxygen-aerobic-MBR-O 3" treatment process.
2. Aerobic Pond
1 of Aerobic Pond: 27.8mX5.9mX5.6m.Other pond body omits.
3. Despumation device
Despumation device constitutes by scraping foam device, defeated foam device, the foam device that disappears, separation water tank, loopback water pump and pipeline.Analyze contrast for convenience, only west system is transformed at present, after Aerobic Pond installed Despumation device additional, the foam that can in time Aerobic Pond be produced was removed, solved our bubble-related issues of long-term puzzlement well, and the east system of not installing Despumation device additional there is still a large amount of foams to overflow.The Despumation device parameter of design is as follows:
● scrape the foam device
Scrape the foam device: adopt running type, specification 534X1700X1100, speed of travel 3m/min, total power 2.7kW (wherein drive-motor 1.5kW promotes motor 0.75kW), scraper plate lift height 300mm, retum speed 12m/min.Supporting cycloidal planetary gear speed reducer: model 3WLY91,1kW, input 1140r/min, reduction ratio 1: 21.3,2 covers.
● defeated foam device
Defeated foam device: adopting has a helical feed mode, specification 420mmX114000mm, 51r/min, 7.5kW; Motor: 1140r/min, 7.5kW; Supporting DF parallel shafts dress helical speed reduction gear: model DFAF87-29, reduction ratio 1: 24.2.Owing to be transformation project, defeated foam device has been crossed over the MBR pond, and its length is longer, reaches 11.7m.
● the foam device disappears
The foam device disappears: centrifugal, and specification 1300r/min, 3kW; Roller diameter 600mm, useful volume 45L; Supporting 300～500 purpose non-woven fabrics filter bags are manually changed.
● separation water tank
1 of separation water tank: 2mX2mX2m, steel is anticorrosion.
● the loopback water pump
Loopback water pump: Q=10m 3/ h, H=10m, 2 of N=0.75kW (1 usefulness 1 is equipped with); Utilize will disappear the dried up Aerobic Pond that is transmitted back to of branch behind the foam of loopback water pump and connecting tube.

Claims (7)

1, the foam-removing method in the Treatment of Coking Effluent is characterized in that this method comprises following processing step:
One, scrapes foam, coking chemical waste water (A) through pre-treatment flows into Aerobic Pond, Aeration fan is given the aerobic microbiological oxygen supply of Aerobic Pond, and the coking chemical waste water (B) after handling through aerobic biochemical flows out to subsequent disposal, and the foam that produces on the Aerobic Pond surface strikes off by scraping the foam device;
Two, defeated foam is scraped the foam that the foam device strikes off and is delivered to the foam device that disappears by defeated foam device;
Three, foam removal, the non-woven fabrics of disappear isolated foam of foam device and replacing separate filter bag (C) outward transport and handle; Isolated water flows into and separates the pond, separates the water outlet in pond and sends Aerobic Pond back to through the loopback water pump, reaches and eliminates the foamy purpose.
2, the foam-removing method in the Treatment of Coking Effluent according to claim 1, it is characterized in that the described foam processing step one of scraping, driving wheel by the wheel driving motor walks, by scraper plate promote motor level probe and scrape foam and the time variable control returned under the scraper plate of elevator belt rubber, scraper plate by the band rubber scrapes foam into the defeated foam groove of failing the foam device, through the screw conveyor shaft that is installed on the defeated foam groove support foam delivery is walked, the level probe that scraper plate is provided with is surveyed liquid level automatically again.
3, the foam-removing method in the Treatment of Coking Effluent according to claim 1, it is characterized in that described foam removal processing step three, foam enters the inner chamber of Despumation device through inlet tube, separating the filter bag high speed centrifugation through the non-woven fabrics that is supported by bucket in the eye stainless steel with holes separates, foam, oil, part mud are held back, isolated water is collected through shell and chassis, enters through rising pipe and separates the pond, sends Aerobic Pond back to through water pump.
4, the Despumation device in the Treatment of Coking Effluent, it is characterized in that scraping the top that the foam device places Aerobic Pond, defeated foam device places an end of Aerobic Pond, disappear the foam device, separate the side that pond, loopback water pump place Aerobic Pond, the rising pipe of foam device of wherein disappearing insert to separate the pond, the rising pipe that separates the pond inserts Aerobic Pond by the loopback water pump, and it is by scraping the scraper plate of the band rubber in the foam device that foam is scraped the defeated foam groove of failing the foam device, and scraper plate is provided with level probe.
5, the Despumation device in the Treatment of Coking Effluent according to claim 4 is characterized in that the described track of scraping in the foam device establishes the track termination at two ends, and wheel drive motors is set on the car body, drives wheel in orbit.
6, the Despumation device in the Treatment of Coking Effluent according to claim 4, it is characterized in that the conveying motor in the described defeated foam device connects screw conveyor shaft, go out the foam mouth and connect defeated foam pipeline, abrasion-proof backing block is installed below the screw conveyor shaft, defeated foam pipeline is fixed by defeated foam pipe support, and screw conveyor shaft 18 is installed on the defeated foam groove support.
7, the Despumation device in the Treatment of Coking Effluent according to claim 4, the structure that it is characterized in that the described foam device that disappears is the tripod form, the chassis is suspended on the leg by suspension rod, antirattle spring, leg places on the base, the foam device peripheral hardware leg outer cover that disappears is established the spacing inlet tube of back-up ring on the foam device that disappears, support a non-woven fabrics by bucket in the eye stainless steel with holes and separate filter bag, the isolated water of collecting through shell and chassis inserts rising pipe, and motor connects main shaft by clutch coupling, pulley belt.
CNA2009101817150A 2009-07-22 2009-07-22 Foam-removing method in the Treatment of Coking Effluent and device thereof Pending CN101607757A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2009101817150A CN101607757A (en) 2009-07-22 2009-07-22 Foam-removing method in the Treatment of Coking Effluent and device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2009101817150A CN101607757A (en) 2009-07-22 2009-07-22 Foam-removing method in the Treatment of Coking Effluent and device thereof

Publications (1)

Publication Number Publication Date
CN101607757A true CN101607757A (en) 2009-12-23

Family

ID=41481684

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2009101817150A Pending CN101607757A (en) 2009-07-22 2009-07-22 Foam-removing method in the Treatment of Coking Effluent and device thereof

Country Status (1)

Country Link
CN (1) CN101607757A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106336003A (en) * 2016-10-14 2017-01-18 重庆工业职业技术学院 Pollutant degradation wastewater treatment device
CN106365298A (en) * 2016-10-14 2017-02-01 重庆工业职业技术学院 Chemical-biological synergized denitrification dephosphorization reactor
CN107265617A (en) * 2017-08-24 2017-10-20 朱秋虹 Sewage treatment aeration tank
CN109252332A (en) * 2018-11-15 2019-01-22 张利明 A kind of foam removal washing machine
CN112028235A (en) * 2020-09-22 2020-12-04 广州晴哲科技有限公司 Water treatment separation equipment
CN115636503A (en) * 2022-12-26 2023-01-24 四川省生态环境科学研究院 Sewage treatment method and device based on activated sludge process

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106336003A (en) * 2016-10-14 2017-01-18 重庆工业职业技术学院 Pollutant degradation wastewater treatment device
CN106365298A (en) * 2016-10-14 2017-02-01 重庆工业职业技术学院 Chemical-biological synergized denitrification dephosphorization reactor
CN107265617A (en) * 2017-08-24 2017-10-20 朱秋虹 Sewage treatment aeration tank
CN109252332A (en) * 2018-11-15 2019-01-22 张利明 A kind of foam removal washing machine
CN112028235A (en) * 2020-09-22 2020-12-04 广州晴哲科技有限公司 Water treatment separation equipment
CN115636503A (en) * 2022-12-26 2023-01-24 四川省生态环境科学研究院 Sewage treatment method and device based on activated sludge process
CN115636503B (en) * 2022-12-26 2023-02-28 四川省生态环境科学研究院 Sewage treatment method and device based on activated sludge process

Similar Documents

Publication Publication Date Title
CN105618439B (en) A kind of crude oil pipeline cleaning system and crude oil pipeline cleaning construction method
CN101607757A (en) Foam-removing method in the Treatment of Coking Effluent and device thereof
CN202336462U (en) Rotary-injection automatic mud disposal device of oil field flow tank
CN203411425U (en) Oil field fracturing flow-back liquid wastewater treatment equipment
CN203653357U (en) Air floater integrating cant board oil separation, cavitation and dissolved air floatation devices
CN104671617B (en) Used cutting liquid and sanitary sewage mixing aftertreatment integration apparatus
CN102079553A (en) Shallow layer flotation machine for industrial wastewater treatment and treatment process thereof
CN202482103U (en) Ultrasonic air floatation oil removing device
CN201436284U (en) Defoaming device for coking wastewater treatment
CN102583617A (en) Isolation type multiphase balanced air floatation device
CN203754514U (en) Progressive air flotation device
CN202881049U (en) Buried type sewage treatment device
CN203256063U (en) Hydraulic loom wastewater treatment and reuse combination apparatus
CN102329039A (en) Mud-water separation system
CN104261581B (en) Integrated oil gas field wastewater processing system
CN103060074B (en) Purifying equipment for prolonging service life of cutting fluid, and purification method thereof
CN104925990A (en) Skid-mounted device for circulating treatment of oil field well flushing flowback fluid and circulating treatment method for oil field well flushing flowback fluid
CN111821723A (en) Paint spraying wastewater treatment system and treatment method thereof
CN105130159A (en) Sludge thickening machine for sludge treatment
CN207608352U (en) Sewage disposal desanding device
CN202643369U (en) Isolation type multiphase balanced air floatation device
CN204958651U (en) Oiliness chemical industry sewage treatment plant
CN205117256U (en) Oiliness drill chip is along with boring processing apparatus
CN208327776U (en) A kind of novel residual active sludge carbon source recyclable device
CN202558671U (en) Ozone floatation device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Open date: 20091223