CN109626477A - A kind of ammonia nitrogen waste water processing system - Google Patents
A kind of ammonia nitrogen waste water processing system Download PDFInfo
- Publication number
- CN109626477A CN109626477A CN201910133068.XA CN201910133068A CN109626477A CN 109626477 A CN109626477 A CN 109626477A CN 201910133068 A CN201910133068 A CN 201910133068A CN 109626477 A CN109626477 A CN 109626477A
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- filler
- ammonia nitrogen
- waste water
- processing system
- tower
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to the technical fields of waste water treatment system, more particularly, to a kind of ammonia nitrogen waste water processing system, the time of contact for solving ammonia nitrogen liquid and gas is shorter, the undesirable problem of the effect of NH_3-N treating, it includes stripping tower, absorption tower and air inducing component, stripping tower includes tower body, spray assembly, filler unit, and each filler unit includes support construction and the filler assembly that is installed in support construction.Pass through several filler units being arranged below spray assembly, so that the ammonia nitrogen liquid droplets that spray assembly sprays uniformly are fallen on filler unit, extend the time of contact of ammonia nitrogen liquid-to-air, it slows down ammonia nitrogen liquid droplets and assembles the speed to form biggish drop, improve the stripping efficiency of ammonia in ammonia nitrogen liquid.
Description
Technical field
The present invention relates to the technical fields of waste water treatment system, more particularly, to a kind of ammonia nitrogen waste water processing system.
Background technique
Ammonia nitrogen waste water is mainly derived from chemical fertilizer, coking, petrochemical industry, pharmacy, food, refuse landfill etc., a large amount of ammonia nitrogen waste waters
It is discharged into water body not only to cause water eutrophication, cause black and odorous water, the difficulty and added cost of Water purification, or even to crowd
And biology generates toxic action.
There are the processing methods such as zeolite deamination method, blow-off method for the treatment process of ammonia nitrogen waste water, wherein blow-off method is.For
Gas, i.e., be passed through in water, come into full contact with gas and liquid two phases, the free ammonia dissolved in water passes through by the ammonia nitrogen dissolved in removing water
Gas-liquid interface is shifted to gas phase, to achieve the purpose that ammonia nitrogen removal.Ammonia nitrogen in water is mostly with ammonium ion (NH4 +) and free ammonia
(NH3) state exist, the two keep balance.
A kind of gas stripping device is disclosed in the Chinese utility model patent that Authorization Notice No. is CN204034692U,
Including stripping tower, liquid-inlet is opened up in the top circumferential wall of the stripping tower, gas vent is arranged in top, and bottom end opens up
There are discharge port and stripping gas access, several packing layers are set in the middle part of the stripping tower, are equipped at the liquid-inlet
Material spray head, stripping are equipped with gas tip at gas access.
Spray head sprays into liquid in stripping tower, and with gradually descending slowly and lightly for liquid, misty liquid droplets gradually condense into biggish liquid
Drop, and drop onto filler rapidly.Drop under gravity, is flowed through out of filler, thus ammonia nitrogen liquid and gas connect
The touching time is shorter, and the effect of NH_3-N treating is undesirable.
Summary of the invention
The object of the present invention is to provide a kind of ammonia nitrogen waste water processing systems, it is advantageous that, NH_3-N treating effect is good.
Foregoing invention purpose of the invention has the technical scheme that
A kind of ammonia nitrogen waste water processing system, the absorption tower being used cooperatively including stripping tower, with the stripping tower and for connecting
The air inducing component on stripping tower and the absorption tower is stated, the stripping tower includes tower body, the sprinkling group for being set to the tower body top
Part, several filler units being set to below spray assembly, each filler unit include support construction and are installed on branch
Filler assembly in support structure.
By using above-mentioned technical proposal, air draught is carried out to stripping tower using air inducing component, meanwhile, the sprinkling in stripping tower
Component sprays into ammonia nitrogen liquid in stripping tower, and ammonia nitrogen liquid comes into full contact in stripping tower with air, makes to dissolve in ammonia nitrogen liquid
Free ammonia pass through gas-liquid interface, to gas phase shift, to achieve the purpose that ammonia nitrogen removal.Pass through what is be arranged below spray assembly
Several filler units extend so that the ammonia nitrogen liquid droplets that spray assembly sprays uniformly are fallen on filler unit
The time of contact of ammonia nitrogen liquid-to-air slows down ammonia nitrogen liquid droplets and assembles the speed to form biggish drop, improves
The stripping efficiency of ammonia in ammonia nitrogen liquid.
With gradually aggregation of the ammonia nitrogen liquid droplets on the filler unit of upper layer, it is gradually dropped in the filler unit of lower layer
On, and new ammonia nitrogen liquid droplets are dispersed as, the contact area of ammonia nitrogen liquid-to-air is increased again, is further increased
The stripping efficiency of ammonia in ammonia nitrogen liquid.
The present invention is further arranged to: the support construction includes the upper filler ring and lower filler ring being installed in tower body inner wall,
The lower surface of the upper filler ring is equipped with suspension frame, and the upper surface of the lower filler ring is equipped with lower suspension frame, the upper suspension
Filler assembly is provided between frame and the lower suspension frame.
By using above-mentioned technical proposal, by the setting of upper filler ring and lower filler ring, to upper suspension frame and lower suspension frame into
Row support, improves the stability of filler assembly installation, prevents under the air inducing effect of air inducing component, filler unit occurs acute
Strong shaking influences the attachment of ammonia nitrogen liquid.
The present invention is further arranged to: the filler assembly includes upper filler support and lower filler support, the upper filler
Filler item is installed between bracket and the lower filler support, fixed knot is provided on the filler item, is pacified in the fixed knot
Equipped with filling ball, the filling ball extends several blocking fibers by the fixed knot and forms.
By using above-mentioned technical proposal, by stopping the setting of fiber, so that ammonia nitrogen liquid adhesive is stopping fiber
End, to increase contact area and the time of contact of ammonia nitrogen liquid-to-air as far as possible.
The present invention is further arranged to: the filler item is uniformly distributed in the upper filler support and lower filler branch of shrinking
On frame, and filler item is arranged along vertically downward direction.
By using above-mentioned technical proposal, filler item is configured along the vertical direction, it is therefore prevented that filler item is in air inducing component
Under the action of, it blows filler and acutely shakes mutually to wind, improve the reliability of filler assembly.
The present invention is further arranged to: the spray assembly includes fixed floor, the cloth water ring being installed on fixed floor
Pipe and water-supply-pipe for the water distribution endless tubes water delivery, are provided with nozzle in the water distribution endless tubes.
By using above-mentioned technical proposal, water-supply-pipe is water distribution endless tubes water supply, and by nozzle that ammonia nitrogen liquid is uniform
It is sprayed onto stripping tower, improves the uniformity of the dispersion of ammonia nitrogen liquid, increase the contact area of ammonia nitrogen liquid-to-air, improve
The efficiency of ammonia stripping in ammonia nitrogen liquid.
The present invention is further arranged to: the nozzle is spiral nozzle.
It can be by ammonia nitrogen liquid with misty droplet by the setting of spiral nozzle by using above-mentioned technical proposal
Form ejects, and further increases the contact area of air Yu ammonia nitrogen liquid, improves stripping efficiency；Meanwhile it is misty
Droplet, decrease speed is slower, is able to extend the time of contact of air Yu ammonia nitrogen liquid, improves stripping effect.
The present invention is further arranged to: the nozzle is distributed in the water distribution endless tubes, and the spray angle of the nozzle is
Straight down.
Reduce and be adhered on stripping inner wall of tower by the setting of nozzle straight down by using above-mentioned technical proposal
Ammonia nitrogen liquid, improve stripping effect.
The present invention is further arranged to: demisting component is provided with above the spray assembly in the tower body.
By using above-mentioned technical proposal, under the action of air-introduced machine, the misty droplet in part, which may be inhaled into, to be drawn
In wind component, corrode air inducing component.By the setting of demisting component, the small liquid of mist of air inducing component will will be inhaled into
Drop is stopped, and is prevented misty droplet from entering in air inducing component, is improved the service life of air inducing component.
The present invention is further arranged to: the demisting component includes upper floor, lower floor, is installed on floor lower surface
It upper screen cloth, the lower screen cloth for being installed on the lower floor upper surface and is filled in several more between the upper screen cloth and the lower screen cloth
Face ball.
By using above-mentioned technical proposal, upper screen cloth and lower screen cloth are fixed with lower floor under upper floor, ensure that
The stability of upper screen cloth and lower screen cloth installation.By being filled in upper screen cloth and lower screen cloth for many-sided ball, when fog-like liquid enters
When in demisting component, since many-sided ball has the characteristics that blade is more, resistance is small, thus misty drop can be by many-sided ball
Blade is stopped, and drop is prevented to be inhaled into air inducing component, improves ammonia nitrogen waste water processing system reliability of operation.
In conclusion advantageous effects of the invention are as follows:
1. air draught is carried out to stripping tower using air inducing component, meanwhile, ammonia nitrogen liquid is sprayed into stripping by the spray assembly in stripping tower
In tower, ammonia nitrogen liquid is come into full contact in stripping tower with air, and the free ammonia dissolved in ammonia nitrogen liquid is made to pass through gas-liquid interface, to
Gas phase transfer, to achieve the purpose that ammonia nitrogen removal；
2. by several filler units being arranged below spray assembly, so that the ammonia nitrogen liquid droplets that spray assembly sprays
It uniformly falls on filler unit, extends the time of contact of ammonia nitrogen liquid-to-air, slow down the aggregation of ammonia nitrogen liquid droplets
The speed for forming biggish drop improves the stripping efficiency of ammonia in ammonia nitrogen liquid.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of ammonia nitrogen waste water processing system.
Fig. 2 is the structural schematic diagram of spray assembly.
Fig. 3 is the scheme of installation of water distribution endless tubes.
Fig. 4 is the structural schematic diagram of air inducing component.
Fig. 5 is the structural schematic diagram of upper filler ring and support plate.
Fig. 6 is the structural schematic diagram of upper suspension frame and lower suspension frame.
Fig. 7 is the structural schematic diagram of filler item and filling ball.
Fig. 8 is the structural schematic diagram of demisting component.
Fig. 9 is the structural schematic diagram of upper screen cloth.
In figure, 1, stripping tower；11, tower body；12, spray assembly；121, fixed floor；1211, mounting groove；122, cloth water ring
Pipe；1221, nozzle；123, water-supply-pipe；124, communicating pipe；125, multistage pump；13, filler unit；131, support construction；1311,
Upper filler ring；1312, lower filler ring；1313, lower suspension frame；1314, support plate；1315, upper suspension frame；132, filler assembly；1321,
Upper filler support；1322, lower filler support；1323, filler item；1324, fixed knot；1325, filling ball；1326, stop fiber；
14, collecting tank；15, demisting component；151, upper floor；152, lower floor；153, upper screen cloth；154, lower screen cloth；155, many-sided ball；
2, absorption tower；21, circulating slot；22, spray equipment；23, circulating pump；3, air inducing component；31, induced duct；32, air-introduced machine.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
It referring to Fig.1, is a kind of ammonia nitrogen waste water processing system disclosed by the invention, including stripping tower 1, absorption tower 2 and air inducing
Component 3, air inducing component 3 are set between stripping tower 1 and absorption tower 2, and for connecting stripping tower 1 and absorption tower 2.
Stripping tower 1 includes the tower body 11 being vertically arranged, spray assembly 12, several filler units for being installed in tower body 11
13 and it is set to the collecting tank 14 of 11 bottom of tower body, the quantity of filler unit 13 is four in the present embodiment, and filler unit 13 is set
It is placed in the lower section of spray assembly 12.
Referring to Fig.1 with Fig. 2, spray assembly 12 is installed on the top of tower body 11, and spray assembly 12 includes being installed on tower body 11
Fixation floor 121 on inner wall, the water distribution endless tubes 122 being installed on fixed floor 121 and water-supply-pipe 123.Fixed floor 121
Edge is welded on the inner wall of tower body 11.Water distribution endless tubes 122 are whole rounded, offer on fixed floor 121 for water distribution endless tubes
The 122 mounting groove 1211(being embedded refer to attached drawing 3), water distribution endless tubes 122 are installed in mounting groove 1211, and mounting groove 1211 is to water distribution
Endless tube 122 is limited, and the stability of the installation of water distribution endless tubes 122 is improved.
The middle part of water distribution endless tubes 122 has been arranged radially communicating pipe 124 along water distribution endless tubes 122.Communicating pipe 124 radially connects
The inside of water distribution endless tubes 122 is passed through, and is connected with water-supply-pipe 123.Multistage pump 125 is provided on water-supply-pipe 123 and by more
Grade pump 125 carries out the water supply of ammonia nitrogen waste water.
The bottom of water distribution endless tubes 122 is equidistantly uniformly equipped with multiple nozzles 1221, and the type of nozzle 1221 is spiral shell
Whirl spraying mouth, the quantity of nozzle 1221 is six in the present embodiment.Each spiral nozzle is arranged straight down, to avoid the mist of ejection
Drop is adhered on the inner wall of tower body 11.By the setting of spiral nozzle, the misty small liquid of the liquid for spraying spray assembly 12
Ammonia nitrogen liquid, can uniformly be sprayed in tower body 11 by drop.
Referring to fig. 4 to fig. 6, the setting of filler unit 13 includes support construction 131 and the filler being installed in support construction 131
Component 132, support construction 131 include the upper filler ring 1311 and lower filler ring 1312 being welded on 11 inner wall of tower body, upper filler ring 1311
Lower surface be welded with suspension frame 1315, the upper surface of lower filler ring 1312 is welded with lower suspension frame 1313.Upper filler ring 1311 with
Lower filler ring 1312 is symmetrical arranged, and upper suspension frame 1315 and lower suspension frame 1313 are also arranged symmetrically.Upper filler ring 1311 generally ring
Shape, the lower part of upper filler ring 1311 are provided with the support plate 1314 of triangle, and the side of support plate 1314 and upper filler ring 1311 weld,
The inner wall of the other side and tower body 11 welds.By the setting of support plate 1314, upper filler ring 1311 is supported, pop-up is increased
The stability that ring 1311 is installed；Similarly, the stability that lower filler ring 1312 is installed is also increased.
Filler assembly 132 includes upper filler support 1321 and lower filler support 1322.Upper suspension frame 1315 and lower suspension frame
1313 is square, and upper filler support 1321 is welded in the diagonal angle of suspension frame 1315, and lower filler support 1322 is welded in
The diagonal angle of lower suspension frame 1313.Upper filler support 1321 is correspondingly arranged with lower filler support 1322, upper filler support 1321 with
If being equipped with filler stem item 1323 between lower filler support 1322, each filler item 1323 is extended vertically downwards.
Referring to Fig. 7, it is provided with several fixed knots 1324 at equal intervals on filler item 1323, pacifies in each fixed knot 1324
Equipped with filling ball 1325.Filling ball 1325 extends several blocking fibers 1326 by fixed knot 1324, stops the length of fiber 1326
Degree is consistent, densely arranged, so as to form chondritic.By stopping the setting of fiber 1326, so that ammonia nitrogen liquid adhesive exists
The end for stopping fiber 1326, can increase contact area and the time of contact of ammonia nitrogen liquid-to-air as far as possible.It is hindering
When the ammonia nitrogen drop of gear 1326 end of fiber adherency is more, it is formed ammonia nitrogen liquid film on the surface of filling ball 1325, it can
More stable presence, to extend the time of contact of ammonia nitrogen liquid-to-air.When ammonia nitrogen liquid is excessive, from blocking fiber
1326 end slides to the filler unit 13 of lower section, and is dropped on filling ball 1325, is adhered to blocking fiber again
On 1326.Thus, contact area and the time of contact of ammonia nitrogen liquid-to-air are significantly increased, ammonia nitrogen waste water processing system is improved
The stripping efficiency and stripping effect of system.
Referring to Fig.1, Fig. 8 and Fig. 9, spray assembly 12(refer to attached drawing 1) above be additionally provided with demisting component 15, demisting group
Part 15 includes the upper floor 151 and lower floor 152 for being welded in 11 inner wall of tower body.The lower surface of upper floor 151 is welded with upper screen cloth
153, the upper surface of lower floor 152 is welded with lower screen cloth 154.Several many-sided balls are filled between upper screen cloth 153 and lower screen cloth 154
155, many-sided ball 155 with a thickness of 30cm.
Air inducing component 3 includes the induced duct 31 being connected with the top of stripping tower 1 and the air inducing being installed on induced duct 31
Machine 32.When nozzle 1221 sprays ammonia nitrogen liquid, the state of ammonia nitrogen liquid is misty liquid droplets, under the action of air-introduced machine 32, portion
Divide misty droplet that may be inhaled into air inducing component 3, corrodes air inducing component 3.Pass through setting for demisting component 15
It sets, the misty droplet that will be inhaled into air inducing component 3 is stopped, prevents misty droplet from entering in air inducing component 3,
Improve the service life of air inducing component 3.
The bottom of stripping tower 1 is provided with collecting tank 14, at the notch of the bottom face collecting tank 14 of stripping tower 1.Collecting tank
The side of 14 notches is provided with discharge outlet, and collecting tank 14 can be discharged by discharge outlet in the waste water being discharged into collecting tank 14.
Referring to Fig.1, the lower part on absorption tower 2 is connected with air-introduced machine 32.The side on absorption tower 2 is provided with an absorption tower 2
The circulating slot 21 that bottom communicates, the neutralizer being filled in circulating slot 21.It is provided with spray equipment 22 in absorption tower 2, recycles
The side of slot 21 is provided with the circulating pump 23 of neutralizer supply spray equipment 22.
The implementation principle of the present embodiment are as follows: when air-introduced machine 32 starts, air draught is carried out to stripping tower 1 using air inducing component 3, together
When, the spray assembly 12 in stripping tower 1 sprays into ammonia nitrogen liquid in stripping tower 1, and ammonia nitrogen liquid is abundant with air in stripping tower 1
Contact makes the free ammonia dissolved in ammonia nitrogen liquid pass through gas-liquid interface, shifts to gas phase, to achieve the purpose that ammonia nitrogen removal.
By several filler units 13 being arranged below spray assembly 12, so that the ammonia nitrogen liquid droplets that spray assembly 12 sprays
It uniformly falls on filler unit 13, extends the time of contact of ammonia nitrogen liquid-to-air, it is poly- to slow down ammonia nitrogen liquid droplets
Collection forms the speed of biggish drop, improves the stripping efficiency of ammonia in ammonia nitrogen liquid.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of ammonia nitrogen waste water processing system, including stripping tower (1), the absorption tower (2) being used cooperatively with the stripping tower (1) and
For connecting the air inducing component (3) of the stripping tower (1) and the absorption tower (2), it is characterised in that: stripping tower (1) packet
Include tower body (11), the spray assembly (12) for being set to the tower body (11) top, be set to it is several below spray assembly (12)
A filler unit (13), each filler unit (13) include support construction (131) and are installed in support construction (131)
Filler assembly (132).
2. a kind of ammonia nitrogen waste water processing system according to claim 1, it is characterised in that: support construction (131) packet
The upper filler ring (1311) being installed on tower body (11) inner wall and lower filler ring (1312) are included, the lower surface of the upper filler ring (1311) is pacified
Equipped with upper suspension frame (1315), the upper surface of the lower filler ring (1312) is equipped with lower suspension frame (1313), the upper suspension frame
(1315) filler assembly (132) are provided between the lower suspension frame (1313).
3. a kind of ammonia nitrogen waste water processing system according to claim 2, it is characterised in that: filler assembly (132) packet
Include filler support (1321) and lower filler support (1322), the upper filler support (1321) and the lower filler support
(1322) it is equipped between filler item (1323), is provided with fixed knot (1324), the fixed knot on the filler item (1323)
(1324) it is equipped on filling ball (1325), the filling ball (1325) extends several blockings fibres by the fixed knot (1324)
Dimension (1326) forms.
4. a kind of ammonia nitrogen waste water processing system according to claim 3, it is characterised in that: the filler item (1323) is uniform
Be distributed on the upper filler support (1321) and the lower filler support (1322), and filler item (1323) is along straight down
Direction setting.
5. a kind of ammonia nitrogen waste water processing system according to claim 1, it is characterised in that: the spray assembly (12) includes
Fixed floor (121), the water distribution endless tubes (122) being installed on fixed floor (121) and be the water distribution endless tubes (122) water delivery
Water-supply-pipe (123) is provided with nozzle (1221) on the water distribution endless tubes (122).
6. a kind of ammonia nitrogen waste water processing system according to claim 5, it is characterised in that: the nozzle (1221) is spiral
Nozzle (1221).
7. a kind of ammonia nitrogen waste water processing system according to claim 5, it is characterised in that: the nozzle (1221) is distributed in
On the water distribution endless tubes (122), the spray angle of the nozzle (1221) is straight down.
8. a kind of ammonia nitrogen waste water processing system according to claim 1, it is characterised in that: in described in the tower body (11)
Demisting component (15) are provided with above spray assembly (12).
9. a kind of ammonia nitrogen waste water processing system according to claim 8, it is characterised in that: the demisting component (15) includes
Upper floor (151), the upper screen cloth (153) for being installed on floor (151) lower surface, is installed on the lower floor at lower floor (152)
(152) lower screen cloth (154) of upper surface and several multi-panels being filled between the upper screen cloth (153) and the lower screen cloth (154)
Ball (155).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133068.XA CN109626477A (en) | 2019-02-22 | 2019-02-22 | A kind of ammonia nitrogen waste water processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910133068.XA CN109626477A (en) | 2019-02-22 | 2019-02-22 | A kind of ammonia nitrogen waste water processing system |
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| Publication Number | Publication Date |
|---|---|
| CN109626477A true CN109626477A (en) | 2019-04-16 |
Family
ID=66065786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910133068.XA Pending CN109626477A (en) | 2019-02-22 | 2019-02-22 | A kind of ammonia nitrogen waste water processing system |
Country Status (1)
| Country | Link |
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| CN (1) | CN109626477A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110395782A (en) * | 2019-09-03 | 2019-11-01 | 吴得意 | A kind of deamination apparatus of efficient removal pig raising biogas slurry ammonia nitrogen in waste water |
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| JPH05184865A (en) * | 1992-01-17 | 1993-07-27 | Kansai Electric Power Co Inc:The | Method for removing carbon dioxide in combustion exhaust gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110395782A (en) * | 2019-09-03 | 2019-11-01 | 吴得意 | A kind of deamination apparatus of efficient removal pig raising biogas slurry ammonia nitrogen in waste water |
| CN110395782B (en) * | 2019-09-03 | 2024-03-29 | 吴得意 | Deamination device of pig feed biogas slurry waste water ammonia nitrogen is got rid of to high efficiency |
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Application publication date: 20190416 |
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| RJ01 | Rejection of invention patent application after publication |