CN203419777U - Electrochemical device for water treatment - Google Patents
Electrochemical device for water treatment Download PDFInfo
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- CN203419777U CN203419777U CN201320499891.0U CN201320499891U CN203419777U CN 203419777 U CN203419777 U CN 203419777U CN 201320499891 U CN201320499891 U CN 201320499891U CN 203419777 U CN203419777 U CN 203419777U
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- Prior art keywords
- anode
- connects
- catalytic oxidation
- electricity flocculation
- negative electrode
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000011282 treatment Methods 0.000 title claims abstract description 25
- 238000005189 flocculation Methods 0.000 claims abstract description 49
- 230000016615 flocculation Effects 0.000 claims abstract description 49
- 230000003647 oxidation Effects 0.000 claims abstract description 49
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 49
- 238000003487 electrochemical reaction Methods 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims description 39
- 230000003197 catalytic effect Effects 0.000 claims description 35
- 238000009434 installation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 14
- 239000010865 sewage Substances 0.000 abstract description 10
- 238000005273 aeration Methods 0.000 abstract description 7
- 230000003068 static effect Effects 0.000 abstract description 7
- 238000002161 passivation Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 3
- 230000005518 electrochemistry Effects 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 239000010936 titanium Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000011269 treatment regimen Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000002848 electrochemical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 239000007900 aqueous suspension Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002594 sorbent Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- -1 hydroxyl radical free radical Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011508 lime plaster Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
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- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
An electrochemical device for water treatment belongs to the technical field of electrochemistry. The two-way pulse power supply device is connected with the electric control device, the aeration device and the electric control device are connected with the electrochemical reaction device, and the electrochemical reaction device is connected with the separation device; the upper part of one side of a box body of the electrochemical reaction device is connected with a water outlet, the lower part of one side of the box body is connected with a gas inlet, the lower part of the other side of the box body is connected with a water inlet, one side of a first electrocatalytic oxidation cathode is connected with an electrocatalytic oxidation anode, and the other side of the electrocatalytic oxidation anode is connected with a second electrocatalytic oxidation cathode; the first electric flocculation cathode is connected to the other side of the box body, one side of the first electric flocculation cathode is connected with the electric flocculation anode, and the other side of the electric flocculation anode is connected with the second electric flocculation cathode. The utility model discloses can realize the intermittent type static state of sewage and handle and continuous dynamic state, can reduce power consumption, reduce electric power running cost, the effectual electrode passivation that prevents simultaneously, the water treatment effect obtains the reinforcing.
Description
Technical field
The utility model relates to a kind of electrochemical appliance for water treatment, belongs to technical field of electrochemistry.
Background technology
Shale gas fracturing outlet liquid, oil-gas field sewage, the complicated components such as petrochemical complex class sewage, toxic substance content is high, all needs just can discharge or reuse through certain processing.
In numerous sewage water treatment methods, electrochemical techniques are because floor space is little, and operative intelligence produces the features such as secondary pollution is little and in water treatment field, is able to gradually promotion and application.Wherein electricity flocculation and catalytic oxidation are the electrochemical process for treating of comparatively commonly using.
Electricity flocculation produces the settlement action of throw out by anode dissolution, negative electrode produces the air supporting effect of micro-bubble, and the redoxomorphism of the nascent oxygen/hydrogen in statu nascendi of generation is removed pollutent during system energising.Especially for waste water from dyestuff, electroplating wastewater etc. have good decolouring and remove suspended substance, the effect of metal ion, but the removal for organic pollutant has certain limitation, and due to the normal direct supply that adopts, electrode passivation phenomenon is comparatively serious, has increased equipment energy consumption and processing cost.
Catalytic oxidation is the direct oxidation reductive action on electrode by pollutent, and the ozone generating in system, hydroxyl radical free radical, and the indirect oxidation effect of reactive chlorine isoreactivity species, is degraded organic pollutant.Two dimension electrochemical process and three-dimensional electrochemical method all have certain application in actual water treatment.Electrocatalytic oxidation method is more effective to organic processing, but suspended substance in system, and the existence of foreign ion etc. all can affect the effect of catalytic oxidation.
Adopt two pulse power supply system, and electricity flocculation and oxidation united with lime-plaster use be have not been reported.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model provides a kind of electrochemical appliance for water treatment, can utilize electricity flocculation and two processes of catalytic oxidation simultaneously, have the advantage of electricity flocculation and catalytic oxidation concurrently, simultaneously owing to possessing dual power supply, make the mode of electricity flocculation and catalytic oxidation coupling also become various, produce and act synergistically simultaneously, make the effect of disposing of sewage more remarkable.
For an electrochemical appliance for water treatment, two-way pulse power electric supply installation connects electric control gear, and aerating apparatus is connected electrochemical reaction appts with electric control gear, and electrochemical reaction appts connects tripping device;
One side top of the casing of electrochemical reaction appts connects water outlet, one side-lower of casing connects inlet mouth, the opposite side below of casing connects water-in, one side of the first catalytic oxidation negative electrode connects catalytic oxidation anode, and the opposite side of catalytic oxidation anode connects the second catalytic oxidation negative electrode; The first electricity flocculation negative electrode is connected to the opposite side of casing, and a side of the first electricity flocculation negative electrode connects electricity flocculation anode, and the opposite side of electricity flocculation anode connects the second electricity flocculation negative electrode.
The pulse power of two-way pulse power electric supply installation, and possess the function that positive and negative electrode circulation exchanges, can reduce power consumption, reduce operation power cost, simultaneously effectively preventing electrode passivation; Can realize according to demand different powering modes: electricity flocculation powering mode, catalytic oxidation powering mode, associating powering mode;
Power supply in electrical control system implement device, turnover water pump, the unlatching of aeration pump etc. and switching, thus realize the coordination of complete assembly, stable, operation automatically;
After tripping device is placed in electrochemical reaction appts, for electrochemical appliance, go out the separated of water suspension and water body, there is sea cock and valve tripping device lower end, is convenient to realize intermittently static treatment, and is convenient to be connected with the pipeline of follow-up other technologies; Tripping device can use strainer, sorbent material, and whizzer,
Electrochemical reaction appts comprises water-in, water outlet, aeration tube, solubility electrode, catalyzed oxidation electrode;
Above-mentioned electrode can adopt tabular, netted, bar-shaped, a kind of in tubulose;
The anode of electricity flocculation electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel;
The negative electrode of electricity flocculation electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel;
In electricity flocculation system, negative electrode quantity is than anode many one;
The anode of electrocatalytic oxidation polarizing electrode can be selected graphite, diamond, a kind of in titanium-based metal oxide electrode;
The negative electrode of electrocatalytic oxidation polarizing electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel;
In order more to make full use of anode, in catalytic oxidation system, negative electrode quantity is than anode many one;
Interelectrode distance is adjustable, can increase and decrease as required electrode, can change the ratio of electricity flocculation electrode and catalytic oxidation number of poles simultaneously, to reach best associated treatment effect;
Aerating system, in electrochemical reaction appts bottom, can destroy suspended substance or the organic pollutant stability in water, or a kind of strong oxidizer is provided, and improves soil removability, and blasting gas is air, oxygen, a kind of in ozone.
An electrochemical method for water treatment, contains following steps;
Select electricity flocculation mode of coupling together with catalytic oxidation to process; Open the power switch of electricity flocculation and catalytic oxidation simultaneously, water body processed,
Select first electric flocculation treatment, then the pattern of carrying out catalytic oxidation processing; First open the power-supply system of electricity flocculation, after processing certain hour, close electricity flocculation power switch, open the pump of separator, through the filtration of separation system, water is back in electrochemical appliance, open catalytic oxidation power supply, water body is carried out to catalytic oxidation processing;
For enhancement process effect, in electrochemical appliance, can add filler, filler can be gac, ceramic particle, zeolite, the mixture of one or more of pure aluminium silicate etc.; Filler adds fashionable available plastic wire parcel, to prevent the generation of short circuit;
At aeration tube interface, connect ozonizer, blast ozone, increase the strong oxidizer in water body, can act synergistically with electric flocculation system, enhancement process effect simultaneously;
Static treatment pattern intermittently, sewage stops after portion of time in electrochemical reaction appts, and through the centrifugation of separator, water is emitted by the sea cock and valve of separator lower end, carries out subsequent disposal or water is utilized;
Continuous dynamichandling pattern is opened the water pump of electrochemical reaction appts and separator simultaneously, selects corresponding electrochemical treatment pattern, sewage is realized continuously in whole device and moved dynamically, until water outlet reaches corresponding requirements.
The utility model has the advantages that the static treatment and continuous dynamichandling at intermittence that can realize sewage, can reduce power consumption, reduce operation power cost, effectively prevent electrode passivation simultaneously.Owing to realizing the combined utilization of electricity flocculation with catalytic oxidation, make the two aspect water treatment, show synergy, water treatment effect is enhanced.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the utility model and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide further understanding of the present utility model, form a part of the present utility model, schematic description and description of the present utility model is used for explaining the utility model, do not form improper restriction of the present utility model, as schemed wherein:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is structural representation of the present utility model.
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present utility model belong to protection domain of the present utility model.
Embodiment 1: as shown in Figure 1 and Figure 2, a kind of electrochemical appliance for water treatment, one side top of casing connects water outlet 1, one side-lower of casing connects inlet mouth 3, the opposite side below of casing connects water-in 2, one side of the first catalytic oxidation negative electrode 5 connects catalytic oxidation anode 4, and the opposite side of catalytic oxidation anode 4 connects the second catalytic oxidation negative electrode 6; The first electricity flocculation negative electrode 8 is connected to the opposite side of casing, and a side of the first electricity flocculation negative electrode 8 connects electricity flocculation anode 7, and the opposite side of electricity flocculation anode 7 connects the second electricity flocculation negative electrode 9.
An electrochemical method for water treatment, contains following steps;
Select electricity flocculation mode of coupling together with catalytic oxidation to process; Open the power switch of electricity flocculation and catalytic oxidation simultaneously, water body processed,
Select first electric flocculation treatment, then the pattern of carrying out catalytic oxidation processing; First open the power-supply system of electricity flocculation, after processing certain hour, close electricity flocculation power switch, open the pump of separator, through the filtration of separation system, water is back in electrochemical appliance, open catalytic oxidation power supply, water body is carried out to catalytic oxidation processing;
For enhancement process effect, in electrochemical appliance, can add filler, filler can be gac, ceramic particle, zeolite, the mixture of one or more of pure aluminium silicate etc.; Filler adds fashionable available plastic wire parcel, to prevent the generation of short circuit;
For further reinforced effects, at aeration tube interface, connect ozonizer, blast ozone, increase the strong oxidizer in water body, can act synergistically with electric flocculation system simultaneously, enhancement process effect;
Static treatment pattern intermittently, sewage stops after portion of time in electrochemical reaction appts, and through the centrifugation of separator, water is emitted by the sea cock and valve of separator lower end, carries out subsequent disposal or water is utilized;
Continuous dynamichandling pattern is opened the water pump of electrochemical reaction appts and separator simultaneously, selects corresponding electrochemical treatment pattern, sewage is realized continuously in whole device and moved dynamically, until water outlet reaches corresponding requirements.
Embodiment 2: as shown in Figure 1 and Figure 2, a kind of electrochemical appliance for water treatment, this device is unenclosed construction, its device schema is as shown in Figure 1.Comprise two-way pulse power power supply system, electrical control system, electrochemical reaction appts, aerating apparatus, tripping device.Can realize intermittently static treatment and continuously dynamichandling.
This system is selected the pulse power, and possesses the function of positive and negative electrode circulation exchange, can reduce power consumption, reduces operation power cost, simultaneously effectively preventing electrode passivation.Can realize according to demand different powering modes: electricity flocculation powering mode, catalytic oxidation powering mode, associating powering mode.
Power supply in electrical control system implement device, turnover water pump, the unlatching of aeration pump etc. and switching, thus realize the coordination of complete assembly, stable, operation automatically
After tripping device is placed in electrochemical reaction appts, for electrochemical appliance, go out the separated of water suspension and water body, there is sea cock and valve tripping device lower end, is convenient to realize intermittently static treatment, and is convenient to be connected with the pipeline of follow-up other technologies.Tripping device can use strainer, sorbent material, and whizzer,
Electrochemical reaction appts as shown in Figure 2, comprises water-in, water outlet, aeration tube, solubility electrode, catalyzed oxidation electrode.
Above-mentioned electrode can adopt tabular, netted, bar-shaped, a kind of in tubulose.
The anode of electricity flocculation electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel
The negative electrode of electricity flocculation electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel
In order more to make full use of anode, in electric flocculation system, negative electrode quantity is than anode many one
The anode of electrocatalytic oxidation polarizing electrode can be selected graphite, diamond, a kind of in titanium-based metal oxide electrode
The negative electrode of electrocatalytic oxidation polarizing electrode can be selected Al, Fe, Zn, Cu, a kind of in Ti or stainless steel
In order more to make full use of anode, in catalytic oxidation system, negative electrode quantity is than anode many one
Interelectrode distance is adjustable, can increase and decrease as required electrode, can change the ratio of electricity flocculation electrode and catalytic oxidation number of poles simultaneously, to reach best associated treatment effect.
Aerating system, in electrochemical reaction appts bottom, can destroy suspended substance or the organic pollutant stability in water, or a kind of strong oxidizer is provided, and improves soil removability, and blasting gas is air, oxygen, a kind of in ozone.
As mentioned above, embodiment of the present utility model is explained, but as long as not departing from fact inventive point of the present utility model and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection domain of the present utility model.
Claims (1)
1. for an electrochemical appliance for water treatment, it is characterized in that two-way pulse power electric supply installation connects electric control gear, aerating apparatus is connected electrochemical reaction appts with electric control gear, and electrochemical reaction appts connects tripping device; One side top of the casing of electrochemical reaction appts connects water outlet, one side-lower of casing connects inlet mouth, the opposite side below of casing connects water-in, one side of the first catalytic oxidation negative electrode connects catalytic oxidation anode, and the opposite side of catalytic oxidation anode connects the second catalytic oxidation negative electrode; The first electricity flocculation negative electrode is connected to the opposite side of casing, and a side of the first electricity flocculation negative electrode connects electricity flocculation anode, and the opposite side of electricity flocculation anode connects the second electricity flocculation negative electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499891.0U CN203419777U (en) | 2013-08-15 | 2013-08-15 | Electrochemical device for water treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320499891.0U CN203419777U (en) | 2013-08-15 | 2013-08-15 | Electrochemical device for water treatment |
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| Publication Number | Publication Date |
|---|---|
| CN203419777U true CN203419777U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320499891.0U Expired - Lifetime CN203419777U (en) | 2013-08-15 | 2013-08-15 | Electrochemical device for water treatment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030413A (en) * | 2014-05-17 | 2014-09-10 | 曹学良 | Treatment device for electrocatalytic oxidation of ship domestic sewage and method thereof |
| CN104370350A (en) * | 2013-08-15 | 2015-02-25 | 中国石油天然气股份有限公司 | Electrochemical device and method for water treatment |
| CN105384222A (en) * | 2015-12-15 | 2016-03-09 | 苏州依斯倍环保装备科技有限公司 | Waste water electric flocculation treatment device |
| CN105417644A (en) * | 2015-12-16 | 2016-03-23 | 无锡吉进环保科技有限公司 | Improved ionized sewage treatment tank |
| CN105565552A (en) * | 2015-12-16 | 2016-05-11 | 无锡吉进环保科技有限公司 | Ionization-type sewage treatment tank |
| CN106045145A (en) * | 2016-07-29 | 2016-10-26 | 中国石油大学(华东) | Method and device for treating waste fracturing liquid of oil and gas field |
-
2013
- 2013-08-15 CN CN201320499891.0U patent/CN203419777U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370350A (en) * | 2013-08-15 | 2015-02-25 | 中国石油天然气股份有限公司 | Electrochemical device and method for water treatment |
| CN104370350B (en) * | 2013-08-15 | 2016-08-10 | 中国石油天然气股份有限公司 | Electrochemical device and method for water treatment |
| CN104030413A (en) * | 2014-05-17 | 2014-09-10 | 曹学良 | Treatment device for electrocatalytic oxidation of ship domestic sewage and method thereof |
| CN105384222A (en) * | 2015-12-15 | 2016-03-09 | 苏州依斯倍环保装备科技有限公司 | Waste water electric flocculation treatment device |
| CN105417644A (en) * | 2015-12-16 | 2016-03-23 | 无锡吉进环保科技有限公司 | Improved ionized sewage treatment tank |
| CN105565552A (en) * | 2015-12-16 | 2016-05-11 | 无锡吉进环保科技有限公司 | Ionization-type sewage treatment tank |
| CN106045145A (en) * | 2016-07-29 | 2016-10-26 | 中国石油大学(华东) | Method and device for treating waste fracturing liquid of oil and gas field |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140205 Effective date of abandoning: 20160810 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |