CN101468264A - Microporous film filter for processing heavy metal wastewater - Google Patents
Microporous film filter for processing heavy metal wastewater Download PDFInfo
- Publication number
- CN101468264A CN101468264A CNA2007101738713A CN200710173871A CN101468264A CN 101468264 A CN101468264 A CN 101468264A CN A2007101738713 A CNA2007101738713 A CN A2007101738713A CN 200710173871 A CN200710173871 A CN 200710173871A CN 101468264 A CN101468264 A CN 101468264A
- Authority
- CN
- China
- Prior art keywords
- filter
- valve
- flexible valve
- filter bag
- tank body
- 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.)
- Granted
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 12
- 229910001385 heavy metal Inorganic materials 0.000 title claims description 8
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 12
- 239000010935 stainless steel Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012459 cleaning agent Substances 0.000 claims abstract description 10
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 210000000988 bone and bone Anatomy 0.000 claims description 11
- 239000000463 material Substances 0.000 abstract description 13
- 239000012528 membrane Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 abstract 2
- 206010053317 Hydrophobia Diseases 0.000 abstract 1
- 206010037742 Rabies Diseases 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 14
- 208000028659 discharge Diseases 0.000 description 11
- 238000001556 precipitation Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000005189 flocculation Methods 0.000 description 6
- 230000016615 flocculation Effects 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 206010046996 Varicose vein Diseases 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical compound [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 description 1
- 229940085805 fiberall Drugs 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010814 metallic waste Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a millipore membrane filter for treating heavy water waste water, which belongs to the technical field of wastewater treatment. The filter comprises a tank body, a stainless steel tube sheet, a bulky polyfluortetraethylene membrane filter bag, filter bag support cage frameworks, an acid feeding flexible valve, a reflux flexible valve, a backsurge flexible valve, a mud discharge flexible, a cleaning agent liquid feeding valve, an air electromagnetic valve and an exhaust electromagnetic valve, wherein the bulky polyfluortetraethylene membrane bag is sleeved on the filter bag support cage framework, and all filter bag support cage frameworks are fixed on the stainless steel tube sheet through screws. The stainless steel tube sheet divides the tank body into two parts, wherein the upper part is a clean water area, and the lower part is a waste liquid area (a filter area). The filter has a simple structure, and takes a membrane made of a bulky polyfluortetraethylene material as a filter material, so as to achieve the real surface filter effect, and completely retain impurities in an acid liquid on the surface of the membrane. Because the selected membrane has excellent acid resistance, hydrophobias and smaller friction coefficient, the block phenomenon of the filter material can not occur.
Description
Technical field
The present invention relates to a kind of equipment of technical field of waste water processing, specifically is a kind of microporous film filter of handling heavy metal wastewater thereby.The present invention can be applicable to handle heavy metal wastewater thereby and HNO
3+ HF nitration mixture pickling waste waters etc.
Background technology
In the former wastewater treatment process, at some heavy metal d p-block element ps, as Cd
2+, Cr
3+, Cu
2+, Fe
2+, Fe
3+, Hg
2+, Pb
2+, Zn
2+Deng and fluoride waste, mainly adopt alkali neutralization precipitation method to handle, form the precipitation of hydroxide and the CaF of particle very tiny (quite a few being arranged about 1 micron)
2And so on precipitation, utilize physical partition method or chemical flocculation precipitation method to carry out separating treatment again.
The physical separation fado is physical method such as to filter, centrifugal, because the restriction of filtering material, granule fails to be stopped by filtrate, makes water outlet can't reach discharge standard, and is same, and granule also can stop up filtrate, causes filtering failure.
The chemical flocculation precipitation method is the main means of administering above-mentioned waste water at present, and its key problem in technology is the selection of flocculant and the control of dosing control and reaction condition.This method can solve most of acid heavy metal waste water handling problems under the reliable prerequisite of operational management, but also has following some deficiency:
(1), processing technological flow is longer, floor space is bigger;
(2), general sedimentation basin institute blowdown mud moisture content is higher, so sludge treating system is huge relatively, invests also high;
(3), the chemical flocculation precipitation method is higher to the precipitation reaction conditional request, impact resistance is poor, when the former water water yield, water quality and the reaction condition of handling when desire took place than great fluctuation process, effluent characteristics was difficult to guarantee;
(4), the ton water running expense of chemical flocculation precipitation method is higher, be mainly reflected in medicament expense and use;
(5), the chemical flocculation precipitation method is because system complex, so operational management requires also higherly, needs perfect management system and sense of responsibility and could realize good operational effect;
(6), because environmental regulation is severe day by day, secondary pollution that the long-term use of the medicament that the chemical flocculation precipitation method adds may bring threatens and can not be ignored.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of microporous film filter of handling heavy metal wastewater thereby is provided.Project organization of the present invention is simple, allocates flexible valve into, and having adopted and having made film with expanded PTFE is filtrate.Reach real surface filtration effect, the benefit of this filter method is: make suspension in the liquid all be trapped in the surface of film, because the film of selecting for use has splendid not being stained with property and very little coefficient of friction, we can guarantee that filter bag can not produce phenomenon of blocking.Under the situation that does not increase operating load, both guaranteed the flux peak of liquid like this, simultaneously also effective collection the solid particle in the liquid.
The present invention is achieved by the following technical solutions, the present invention includes: tank body, stainless steel card, eptfe film filter bag, filter bag support cages bone, advance sour flexible valve, backflow flexible valve, backwash flexible valve, spoil disposal flexible valve, cleaning agent feed liquor valve, air magnetic valve, exhaust solenoid valve.The eptfe film filter bag is enclosed within on the filter bag support cages bone, by screw all filter bag support cages bones is fixed on the stainless steel card then.The stainless steel card is divided into two tank body, and top is clear water zone, and the bottom is waste liquid (promptly filtering) district.The top, waste liquid district of tank body is provided with the acid discharge pipeline, and the acid discharge pipeline can be connected in descaling bath.The tank body periphery is provided with into sour flexible valve, backflow flexible valve, backwash flexible valve, spoil disposal flexible valve, cleaning agent feed liquor valve, air magnetic valve, exhaust solenoid valve valve.
The filter core of microporous film filter is made up of expanded PTFE filter bag and filter bag support cages bone.The film filter bag adopts that matter is close, porous, smooth expanded PTFE (PTFE) material, its low-friction coefficient, chemical stability and ganoid characteristics make filter pressure only need 0.07～0.1MPa, and the surface of film is cleared up very easily, with the clear film time of calculating second, make filtration reach continuous operation substantially, polytetrafluoroethylene (PTFE) is again the very high material of a kind of intensity simultaneously, makes life-span of filtering material be much higher than traditional filter material.Had splendid chemical stability by expanded polytetrafluoroethylene film filtrate, extremely low coefficient of friction, the temperature that ability is higher, porous, extreme obdurability are difficult for wearing out, and heavily fortified point is durable for a long time, is desirable filter material.The support cages bone has various material available, is applicable to different environments for use and field respectively.
In the configuration of valve, selected for use and do not had the flexible valve that stops up forever, flexible valve outward appearance novelty, simple in structure, flexibility contact by the valve inner bag, making the liquid that contains any solid particle, fiber all can reach 100% rapidly closes, when the solid particle diameter reach caliber 1/2 the time, flexible valve still can effectively close and open.Flexible valve is reasonable in design, and is widely applicable, no internal and outernal leakage, and latus rectum is big, and is easy for installation, and high-efficiency long-life can be through the keying more than tens thousand of times.
Microporous film filter has following characteristics:
1. filter pressure is low
Filter pressure only needs 0.07～0.1MPa, and the filter pressure of other liquid filter generally is about 0.3MPa.
2. to the effective filtration of beginning to end
Existing liquid filter (filtering as sand) always penetrates earlier at the beginning, just begins effective filtration along with filter cake formation and after reaching certain thickness, and is 10% of whole filtration time during this period of time approximately.And invention is a surface filtration, and it does not have penetration phenomenon, is exactly effectively to filter from beginning.
3. primary purification, 100% holds back
The present invention does not need other affiliated facility, or divides and filter the purpose that just can reach decontaminating liquid several times, just can finish but once filter.Is 100% to be trapped at the film latus rectum with interior solid.
4. high throughput, continuous operation
Filter capacity is 5～10 times of other general filter, even 20 times, and need not reach the purification purpose by other solid-liquid separating equipment or segment processing, but disposable filtering is finished Separation of Solid and Liquid.
5. Kuan Guang filter area
The solids content of filtered fluid can be from 20PPM (0.002%) until 100000PPM (10%), also can filter as the liquid of mud, and can not influence filter effect because of too high solids content, and the clear liquid of discharge still is as clear as crystal.
6. good heat resistance
High energy is worked under 260 ℃ of high temperature.
7. wash filter material automatically
When filtration pressure reaches setting value, filter carries out the filter material flushing automatically, whole process only needed for 1～5 second, the pressure of flushing need not surpass 0.035MPa, do not need the emptying filter to recoil during flushing, flushing one finishes, and filter enters the filtration state again, whole process circular flow can realize control automatically by PLC.
8. film is difficult for stopping up
Because surface filtration, because the characteristic of filter membrane itself can both be fallen the outer filter cake of film by cleaning down when washing at every turn, flushing back circulation returns to normal condition again again.
9. fabulous anti-chemistry
Membrane filter has fabulous chemical stability, any acid-base solution of ability.
Life-span long, use cost is low
Poly-PTFE is made because the filter filtration material film is a varicosity, and it has particular performances: the wide operating temperature d. of a. chemistry inertness b. low-friction coefficient c. extremely strong toughness g. surface filtration of e. hydrophily f. that can not wear out.These characteristics make it reach the long-life, and maintenance cost significantly reduces, because low press filtration, energy consumption is few again, and use cost also greatly reduces.
11. floor space is little
Microporous film filter only needs the floor space of the traditional filtering device 1/10th of other same treatment amounts, and volume also is significantly smaller than other filter.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided the detailed embodiment and the course of work being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment microporous film filter mainly comprises: tank body 1, stainless steel card 2, eptfe film filter bag 3, filter bag support cages bone 4, advance sour flexible valve 5, backflow flexible valve 6, backwash flexible valve 7, spoil disposal flexible valve 8, cleaning agent feed liquor valve 9, air magnetic valve 10, exhaust solenoid valve 11.Eptfe film filter bag 3 is enclosed within on the filter bag support cages bone 4, by screw all filter bag support cages bones 4 is fixed on the stainless steel card 2 then.Stainless steel card 2 is divided into two tank body 1, and top is clear water zone, and the bottom is waste liquid (promptly filtering) district.The top, waste liquid district of tank body 1 is provided with the acid discharge pipeline, and the acid discharge pipeline can be connected in descaling bath.Tank body 1 periphery is provided with valves such as into sour flexible valve 5, backflow flexible valve 6, backwash flexible valve 7, spoil disposal flexible valve 8, cleaning agent feed liquor valve 9, air magnetic valve 10, exhaust solenoid valve 11.
The course of work of present embodiment is as follows:
Acid solution in the descaling bath is passed through water pump lifting, enter tank body 1 by advancing sour flexible valve 5, after eptfe film filter bag 3 surface filtrations, impurity in the acid solution is attached on the eptfe film filter bag 3, form mud, the top acid discharge pipeline that the acid solution after the filtration enters tank body 1 again is back in the descaling bath.
During backwash, advance sour pump and do not quit work, only will advance sour flexible valve 5 and close, backflow flexible valve 6 is opened, and backwash flexible valve 7 is also opened, at this moment, acid solution does not enter in the filter, and being back to descaling bath, owing to stop feed liquor, internal pressure reduces in the filter, acid solution after the filtration oppositely flows out by film filter bag 3 inner bags and enters in the filter, discharge by backwash flexible valve 7 again, simultaneously the mud that is attached on film filter bag 3 surfaces is washed away, sink to the awl bottom of tank body 1.At this moment, open spoil disposal flexible valve 8, mud is discharged in tank body 1, enters products for further processing in the sludge-tank.
When initial start-up, all be air in the tank body 1, then need exhaust solenoid valve 11 is opened, to guarantee tank body 1 internal pressure equilibrium.
When filter need clean, the cleaning agent liquid-feeding pump is inserted on the cleaning agent feed liquor valve 9, the cleaning agent feed liquor can be opened air magnetic valve 10 after finishing, and fully stirs, and is beneficial to clean.
The filter of present embodiment, design discharge 15m
3/ h contains F in the waste water
-, Cr
3+, Fe
2+, Ni
2+Plasma adopts the carbide slag neutralization, then by microporous film filter, and design microporous membrane aperture＜0.45 micron, tank diameter 1600mm selects 37.5m for use
2The microporous film filter of filter area, water outlet effect reach the secondary discharge standard in " Shanghai City integrated wastewater discharge standard ".Water outlet F
-Stable content is about 5mg/l.Solved a fluorine-containing difficult problem that exceeds standard in this type of wastewater treatment water outlet.
Claims (1)
1. microporous film filter of handling heavy metal wastewater thereby, comprise: tank body, the stainless steel card, filter bag support cages bone, advance sour flexible valve, the backflow flexible valve, the backwash flexible valve, the spoil disposal flexible valve, cleaning agent feed liquor valve, the air magnetic valve, exhaust solenoid valve, it is characterized in that, also comprise the eptfe film filter bag, the eptfe film filter bag is enclosed within on the filter bag support cages bone, by screw all filter bag support cages bones are fixed on the stainless steel card then, the stainless steel card is divided into two tank body, top is clear water zone, the bottom is the waste liquid district, the top, waste liquid district of tank body is provided with the acid discharge pipeline, and the tank body periphery is provided with into sour flexible valve, the backflow flexible valve, the backwash flexible valve, the spoil disposal flexible valve, cleaning agent feed liquor valve, the air magnetic valve, exhaust solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101738713A CN101468264B (en) | 2007-12-29 | 2007-12-29 | Microporous film filter for processing heavy metal wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101738713A CN101468264B (en) | 2007-12-29 | 2007-12-29 | Microporous film filter for processing heavy metal wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101468264A true CN101468264A (en) | 2009-07-01 |
| CN101468264B CN101468264B (en) | 2011-12-07 |
Family
ID=40826220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101738713A Expired - Fee Related CN101468264B (en) | 2007-12-29 | 2007-12-29 | Microporous film filter for processing heavy metal wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101468264B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101468265B (en) * | 2007-12-29 | 2010-12-01 | 上海同济科蓝环保设备工程有限公司 | Microporous film filter for acid liquor filtering |
| CN101619463B (en) * | 2009-07-17 | 2011-01-05 | 中国印刷科学技术研究所 | Method for on-line pickling solution treatment and system thereof |
| CN101991981A (en) * | 2009-08-07 | 2011-03-30 | 布鲁诺布二世有限公司 | Method for recovering filter cake and device for cake forming and washing filtration |
| CN101642643B (en) * | 2009-08-22 | 2011-07-13 | 湖州德翔环境科技有限公司 | High-efficiency, convenient and fast filter for water pretreatment |
| CN109442383A (en) * | 2018-12-24 | 2019-03-08 | 南京慧城水处理设备有限公司 | Condensing hot air furnace filtering reuses energy conserving system |
| CN110075584A (en) * | 2019-05-07 | 2019-08-02 | 哈尔滨三幸水处理设备制造有限公司 | A kind of filtering cleaning method of mechanical filter |
| CN112275005A (en) * | 2020-11-27 | 2021-01-29 | 郑州市林慕商贸有限公司 | Automatic back flush water purifier |
| CN112520918A (en) * | 2020-10-31 | 2021-03-19 | 湖南内特环保科技有限公司 | Filtering membrane system for treating heavy metal wastewater |
| CN113697903A (en) * | 2021-07-21 | 2021-11-26 | 利得膜(北京)新材料技术有限公司 | Zero-medicament short-flow membrane direct filtration system and sewage treatment method |
| CN114470923A (en) * | 2020-10-27 | 2022-05-13 | 中核建中核燃料元件有限公司 | Cleanable bag filter for liquid |
| US11639302B2 (en) | 2016-11-10 | 2023-05-02 | Mexichem Fluor S.A. De C.V. | Process for reducing the concentration of arsenic in an aqueous solution comprising a fluoroacid |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1229001A (en) * | 1998-03-16 | 1999-09-22 | 韩国净水工业株式会社 | Micro-filtration method using fiber hose and apparatus thereof |
| CN2415825Y (en) * | 2000-04-06 | 2001-01-24 | 江西省萍乡市高铝工业瓷厂 | Efficient filter |
| CN2461638Y (en) * | 2000-09-12 | 2001-11-28 | 江苏省宜兴非金属化工机械厂 | Ceramic filtering tube and filter for separating micron from titan white wasted water |
| CN1170619C (en) * | 2000-09-26 | 2004-10-13 | 王蛟 | Membrane filter |
| CN2460183Y (en) * | 2000-12-20 | 2001-11-21 | 袁小平 | Sewage treater |
| CN101468265B (en) * | 2007-12-29 | 2010-12-01 | 上海同济科蓝环保设备工程有限公司 | Microporous film filter for acid liquor filtering |
-
2007
- 2007-12-29 CN CN2007101738713A patent/CN101468264B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101468265B (en) * | 2007-12-29 | 2010-12-01 | 上海同济科蓝环保设备工程有限公司 | Microporous film filter for acid liquor filtering |
| CN101619463B (en) * | 2009-07-17 | 2011-01-05 | 中国印刷科学技术研究所 | Method for on-line pickling solution treatment and system thereof |
| CN101991981A (en) * | 2009-08-07 | 2011-03-30 | 布鲁诺布二世有限公司 | Method for recovering filter cake and device for cake forming and washing filtration |
| CN101642643B (en) * | 2009-08-22 | 2011-07-13 | 湖州德翔环境科技有限公司 | High-efficiency, convenient and fast filter for water pretreatment |
| US11639302B2 (en) | 2016-11-10 | 2023-05-02 | Mexichem Fluor S.A. De C.V. | Process for reducing the concentration of arsenic in an aqueous solution comprising a fluoroacid |
| CN109442383A (en) * | 2018-12-24 | 2019-03-08 | 南京慧城水处理设备有限公司 | Condensing hot air furnace filtering reuses energy conserving system |
| CN110075584A (en) * | 2019-05-07 | 2019-08-02 | 哈尔滨三幸水处理设备制造有限公司 | A kind of filtering cleaning method of mechanical filter |
| CN114470923A (en) * | 2020-10-27 | 2022-05-13 | 中核建中核燃料元件有限公司 | Cleanable bag filter for liquid |
| CN112520918A (en) * | 2020-10-31 | 2021-03-19 | 湖南内特环保科技有限公司 | Filtering membrane system for treating heavy metal wastewater |
| CN112275005A (en) * | 2020-11-27 | 2021-01-29 | 郑州市林慕商贸有限公司 | Automatic back flush water purifier |
| CN113697903A (en) * | 2021-07-21 | 2021-11-26 | 利得膜(北京)新材料技术有限公司 | Zero-medicament short-flow membrane direct filtration system and sewage treatment method |
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| Publication number | Publication date |
|---|---|
| CN101468264B (en) | 2011-12-07 |
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20111207 |