CN106430605A - Artificial wetland device for deep denitrification of tail water in sewage treatment plant and application - Google Patents
Artificial wetland device for deep denitrification of tail water in sewage treatment plant and application Download PDFInfo
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Abstract
The invention discloses an artificial wetland device for deep denitrification of tail water in a sewage treatment plant and application. The artificial wetland device sequentially comprises a vegetation layer, a coarse sand layer, a first gravel matrix layer, a second gravel matrix layer, a supporting layer and a water collecting region from top to bottom, wherein the first gravel matrix layer and the second gravel matrix layer are uniformly doped with iron charcoal; the water collecting region is located below the supporting layer; a perforated organic glass water collecting plate is mounted at the top of the water collecting region. The artificial wetland device provided by the invention is simple in structure and convenient to operate and manage, can effectively purify the tail water of the sewage treatment plant, in particular, improves the denitrification efficiency of artificial wetland, realizes the goal of efficient denitrification and stable operation throughout the year, can further reduce the concentration of pollutants in effluent water of the sewage treatment plant, and is conducive to continuous improvement of water environment.
Description
Technical field
The present invention relates to sewage treatment area, more particularly to a kind of artificial for sewage treatment plant tail water advanced treating
Wetland high-efficiency nitrogen rejection facility.
Background technology
At present, most of sewage treatment plant of China still based on two stage treatment although sewage second-level biological treatment can cut down
Most of pollutant, tail Organic substance in water, nitrogen, phosphorus concentration are still higher.2010-2014, south China urban wastewater treatment
The main water quality index of factory's secondary effluent is as follows：COD 51.64±22.11mg/L、NH4 +-N 12.63±9.02mg/L、TN
21.54±12.49mg/L、TP 1.94±1.28mg/L.It can be seen that, in tail water, pollutant load is still very high, especially TN concentration
Higher, some sewage treatment plants are also often faced with the exceeded risk of water outlet TN.Will even if sewage plant tail water reaches maximum emission
Ask《Urban wastewater treatment firm pollutant emission standard》(GB18918-2002) one-level A standard, still falls within bad V class water, right
Still important polluter for receiving water body.For the limited receiving water body of self-purification capacity, sewage second-level
Process can not fundamentally solve its eutrophication problem, can only delay its development trend.In addition, internationally recognized water body is rich
Nutrient laden marginal value is [TN 0.2mg/L, TP 0.2mg/L], and therefore, secondary effluent is still to cause receiving water body eutrophication
One of major reason.
Sewage plant tail water is carried out advanced treating, the impact to receiving water body for the tail water can be reduced, improve China's water environment；
Tail water water quality through advanced treating reaches after certain standard, also can be back to industrial or agricultural and municipal water use, supplements surface water, carries out
Groundwater recharge etc., thus increasing water supply, reduces the impact to environment for the behavior of men.Artificial swamp is to develop in recent years
A kind of novel ecological treatment technology getting up, all has good effect in terms of organic pollution, antibacterial, trace organic substance removal
Really, have been widely used at purification of water quality and recovery, pollution of area source control, rainwater treatment and the utilization, sewage of polluted-water
The fields such as reason, have that pollutant removal is stable, the low remarkable advantage of reduced investment, operating cost, are to cut down in secondary effluent
One of effective technique of the pollutant such as nitrogen phosphorus, is that the advanced treating of sewage treatment plant tail water opens a new way.
Vertical current constructed wetland is more and more wider due to being subject to the advantages of floor space is few, high treating effect, sanitary condition are good
General concern.Meanwhile, vertical current constructed wetland is formed aerobic, anoxia, anaerobic environment, are conducive to microorganism nitrification, denitrification
The carrying out of effect, thus improve the nitric efficiency of device.But, sewage treatment plant tail water is being processed using vertical current constructed wetland
When, due to the special water quality of tail water, find to still suffer from following defect：(1) after two stage treatment, the carbon source of tail water is low, can give birth to
Poor (the BOD of the property changed5/ COD is 0.1～0.35, BOD5/ TN is about 1), the Organic substance in tail water is mainly fulvic acid, humic acid, table
Face activating agent and other trace hardly degraded organic substances, these Organic substances are difficult to be utilized by the microorganism, and wetland device can utilize carbon
Source deficiency is that restriction micro-organisms Denitrification leads to the low main cause of nitric efficiency；(2) because winter temperature is low, vegetable layer
Withered, plant declines to the removal ability of pollutant, or even can discharge part nitrogen phosphorus in water；On the other hand, temperature drop meeting
Reduce electron transport rate in microbial cell, lead to microbial activity and biological denitrificaion ability to decline, finally have impact on whole
The denitrification effect of wetland device.
Content of the invention
The technical problem solving：Higher, the current perpendicular flow artificial for nitrogen content in sewage treatment plant's two stage treatment tail water
Wetland variation sewage plant tail water has that carbon source is low, biodegradability is poor, the dirt-removing power of winter temperature low impact wetland device, thus
Lead to the low problem of its nitric efficiency, the present invention provides a kind of constructed wetland device for sewage treatment plant tail water advanced nitrogen
And application.
Technical scheme：The described constructed wetland device for sewage treatment plant tail water advanced nitrogen, including from top to bottom according to
The vegetable layer of secondary arrangement, coarse sands layer, the first gravel hypothalluses, the second gravel hypothalluses, supporting layer and gathering ground；
It is provided with the online ORP electrode of the first gravel hypothalluses in the middle part of described first gravel hypothalluses；
It is provided with the online ORP electrode of the second gravel hypothalluses in the middle part of described second gravel hypothalluses；
Described gathering ground top is provided with perforation water collection sheet, and gathering ground bottom is provided with the gradient and is 5% and is in funnelform slope,
Described slope center is provided with slag-drip opening, additionally, gathering ground bottom is provided with support column；
The described constructed wetland device top for sewage treatment plant tail water advanced nitrogen is provided with water inlet, and bottom is provided with out
The mouth of a river；
Described first gravel hypothalluses Uniform Doped ferrum charcoal I, in described ferrum charcoal I, ferrum charcoal mass ratio is MFe：MC=2:1～6:
1；
Described second gravel hypothalluses Uniform Doped ferrum charcoal II, in described ferrum charcoal II, ferrum charcoal mass ratio is MFe：MC=0.5:1
～2:1.
Preferably, ferrum charcoal I is the bulk of diameter 10～30mm, in ferrum charcoal, ferrum charcoal mass ratio is MFe：MC=5:1.
Preferably, ferrum charcoal II is the bulk of diameter 10～30mm, in ferrum charcoal, ferrum charcoal mass ratio is MFe：MC=1:1.
Preferably, the coarse sand particle diameter of described coarse sands layer is 2～4mm.
Preferably, the grain size of gravel of described gravel hypothalluses is 4～8mm, the doping of described gravel hypothalluses and ferrum charcoal
Ratio is the 0.5%～3% of gravel hypothalluses gross mass.
Preferably, described gravel hypothalluses are the 1% of gravel hypothalluses gross mass with the doping ratio of ferrum charcoal.
Preferably, described supporting layer is made up of gravel, described grain size of gravel is 8～16mm.
Preferably, described perforation water collection sheet open pore size is 5mm, percent opening is 8.25%.
Another kind of technical scheme of the present invention also includes described constructed wetland device in sewage treatment plant tail water advanced nitrogen
In application.
Described applying step is：
1) tail water enters vegetable layer (4) from wetland device top, directly absorbs the nitrogen P elements in sewage using plant；
2) after carrying out initial absorption, tail water enters into coarse sands layer (5), removes oarse-grained float；
3) pretreated tail water enters the first gravel hypothalluses (6), will be organic for complicated macromole by Fe-C method
Thing is decomposed into small organic molecule；
4) tail water after processing enters the second gravel hypothalluses (7), produces through the Denitrification of denitrifying bacterium and electrolysis
Hydrogen Denitrification carries out denitrogenation to tail water, and described denitrifying bacterium is microsphere denitrifying bacterium.
Beneficial effect：1st, the present invention in the substrate of the first gravel hypothalluses Uniform Doped ferrum charcoal I (ferrum charcoal mass ratio is
MFe：MC=2:1～6:1), the block ferrum charcoal of diameter 10～30mm, ferrum charcoal forms former electricity in the sewage with certain electrical conductivity
, there is Inner electrolysis reaction in pond, compared with existing vertical current constructed wetland, can divide complicated larger molecular organicses in sewage
Solve as small organic molecule, consuming the Denitrification for microorganism while oxygen provides more available carbon sources.
2nd, the present invention in the substrate of the second gravel hypothalluses Uniform Doped ferrum charcoal II (ferrum charcoal mass ratio is MFe：MC=
0.5:1～2:1), the block ferrum charcoal of diameter 10～30mm, under anaerobic, this gravel hypothalluses are traditional different except occurring
Foster Denitrification outer it also occur that electrolytic hydrogen production autotrophic denitrification, the H that autotrophic denitrification bacterium is produced with electrode2Supply for electronics
Body, nitrogen oxides are reduced into N as electron acceptor2.Compared with existing vertical current constructed wetland, tradition can not only be realized
Heterotrophic denitrification denitrogenation, may additionally facilitate the autotrophic denitrification denitrogenation of microorganism, thus improve the nitric efficiency of wetland device.
3rd, compared with existing vertical current constructed wetland, the present invention pass through from top to bottom set gradually vegetable layer, coarse sands layer,
First gravel hypothalluses, the second gravel hypothalluses and supporting layer, absorption of going forward one by one processes nitrogen, improves the denitrogenation of wetland device
Efficiency.
4th, compared with existing vertical current constructed wetland, the present invention is in the first gravel hypothalluses and the second gravel hypothalluses
There is galvanic interaction in the ferrum charcoal of doping, the nascent state iron ion of generation can participate in and pass through Fe in cell2+And Fe3+Between
Redox reaction is come the electron transmission to carry out, thus improve the speed of biochemical reaction, and is effectively improved carbon source biodegradability；
Being respectively provided with of two-layer ferrum charcoal can promote the synchronization of heterotrophic denitrification and autotrophic denitrification to be smoothed out, and improves wetland dress further
Put nitric efficiency, the denitrification effect of wetland when particularly improving winter low temperature.
Brief description
Fig. 1 is apparatus of the present invention schematic diagram；
Fig. 2 is the structural representation of perforation water collection sheet.
In figure：1. enter bucket；2. peristaltic pump；3. water inlet pipe；4. vegetable layer；5. coarse sands layer；6. the first gravel hypothalluses；7.
Second gravel hypothalluses；8. supporting layer；9. perforation water collection sheet；10. gathering ground；11. slag-drip openings；12. outlet pipes；13. second gravels
Stone hypothalluses online ORP electrode；The online ORP electrode of 14. first gravel hypothalluses；15. ferrum charcoal I (MFe：MC=2:1～6:1)；
16. ferrum charcoal II (MFe：MC=0.5:1～2:1)；17. bottom support columns.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail.
Embodiment 1
Referring to Fig. 1, there is shown with a kind of constructed wetland device for sewage treatment plant tail water advanced nitrogen of the present invention
Preferred embodiment, described constructed wetland device includes vegetable layer 4, coarse sands layer 5, the first gravel hypothalluses 6, the second gravel hypothalluses
7 and supporting layer 8, supporting layer 8 lower section is gathering ground 10.Sewage treatment plant tail water squeezes into wetland device by peristaltic pump 2, flows successively
Through vegetable layer 4, the first gravel hypothalluses 6, the second gravel hypothalluses 7, supporting layer 8, worn by the lucite of supporting layer 8 lower section
Hole water collection sheet 9 enters gathering ground 10, from bottom water outlet.
Vegetable layer 4 can have the emergent aquactic plant of flourishing root system from perennial phragmites communiss, Herba Typhae, Herba Lythri Salicariae etc., permissible
Single or collocation miscegenation.Plant can directly absorb the nitrogen P elements in sewage, and complicated root system can be microorganism
Absorption Growth provides bigger surface area moreover it is possible to convey oxygen, the penetration to substrate for the root system to wetland device, can strengthen
The sedimentation of substrate, thus strengthen and maintain the hydraulic conductivity of substrate.
Coarse sands layer 5 medium coarse sand particle diameter is 2～4mm, is that microorganism provides stable attaching surface, also normal for plant
Growth provides carrier.Coarse sands layer 5 can also float in effectively catching sewage, to delay the blocking of wetland device.Additionally, it is thick
Layer of sand 5 itself can remove the nutrient substance such as nitrogen phosphorus in sewage by the materializing procedure such as absorption, filtration, ion exchange.
First gravel hypothalluses 6 are one of main removal units of pollutant, Uniform Doped ferrum charcoal I 15 (ferrum in substrate
Charcoal mass ratio is MFe：MC=2:1～6:1), ferrum charcoal is immersed in the sewage with certain electrical conductivity and can form the former electricity of ferrum charcoal
Pond, there is electrode reaction Fe-2e=Fe in anode2+(E0=-0.44V), in, under alkalescence condition negative electrode occur electrode reaction O2+
2H2O+4e=4OH-(E0=+0.40V).Fe-C method process produces [H] and the Fe of activity in a large number2+, make the complexity in sewage
There is the effect such as open loop, chain rupture in Organic substance, in addition, in Fe2+It is oxidized to Fe3+During, can produce with strong oxidizing property
OH, O, can destroy-CN and C=O key.A series of redox reaction being caused by electrochemical action, can be by dirt
Complicated larger molecular organicses in water are decomposed into small organic molecule, thus improving tail water biodegradability, are microorganism denitrification
Effect provides and carbon source more can be utilized, and improves the nitric efficiency of wetland device.
Second gravel hypothalluses 7 are the formants of denitrogenation, and sewage biodegradability after the first gravel hypothalluses 6 obtains
Improve, the heterotrophic denitrification effect for this unit provides carbon source more can be utilized, it is possible to increase denitrification denitrogenation efficiency.
Second gravel hypothalluses 7 are also doped with ferrum charcoal II 16, and (ferrum charcoal mass ratio is MFe：MC=0.5:1～2:1), this gravel hypothalluses remove
Occur outside traditional Denitrification, it also occur that electrolytic hydrogen production autotrophic denitrification.Electrolytic hydrogen production autotrophic denitrification is microorganism
The autotrophic denitrification being reduced nitrogen oxides for electron donor with hydrogen, this kind of denitrifying bacterium is mainly microsphere denitrifying bacterium, needs
Carry out under anoxia or anaerobic condition.Through coarse sands layer and the first gravel hypothalluses to O2Consumption after, the second gravel substrate
Layer is substantially at scarce/anaerobic state, and anode can occur electrode reaction C+2H2O=CO2+4H++4e(E0=-0.207V), negative electrode
There is electrode reaction 2H2O+2e=H2+2OH-(E0=0V), electrode reaction provides electron donor and inorganic carbon source respectively as certainly
The denitrifying foster source of foster microorganism.Second gravel hypothalluses mainly occur to produce H2, produce CO2Autotrophic denitrification react realizing taking off
Nitrogen, Fe2+Dissolution is secondary reaction, can accelerate electron transmission in microbial cell, therefore this hypothallus MFe：MCSuitably reduce (ferrum
Charcoal mass ratio is MFe：MC=0.5:1～2:1).
The grain size of gravel of described gravel hypothalluses is 4～8mm, and the doping ratio of described ferrum charcoal is gravel hypothalluses gross mass
0.5%～3%.
Fe2+And Fe3+It is important electron transport system in microbial life activity, produce during Fe-C method
Fe2+And Fe3+This electron transmission being participated in, thus accelerating the electron transmission efficiency in cell, improving microbial activity.
It is respectively equipped with 13,/14 two online ORP electrodes, difficult fall in the middle part of first gravel hypothalluses 6 and the second gravel hypothalluses 7
Solution Organic substance needs to be degraded to small organic molecule under preferable oxidizing condition, and Denitrification needs in anaerobic condition
Lower could occur, ORP be directly reflection environmental oxidation reduce situation index.The present invention arranges online ORP and is intended to research interpolation
The improvement situation to wet land system redox environment for the ferrum charcoal.
Described gathering ground 10 top is provided with perforation water collection sheet 9, and described perforation water collection sheet 9 open pore size is 5mm, and percent opening is
8.25%, gathering ground 10 bottom is provided with the gradient and is 5% and is in funnelform slope, described slope center is provided with slag-drip opening 11, this
Outward, gathering ground 10 bottom is provided with support column.
Fe-C method, autotrophic denitrification are introduced artificial swamp by the present invention, by wetland device plant absorption, microorganism
The materializations such as degraded, the absorption and precipitation and bio combined effect realization efficient denitrification to tail water, the depth jointly completing tail water is net
Change.
Present configuration is simple, process stabilizing, with low cost, can bear certain pollutional load and hydraulic load punching
Hit, can effectively purify sewage treatment plant tail water, particularly improve denitrification efficiency of constructed wetland, ensureing that sewage treatment plant goes out
On the basis of water is up to standard, reduces sewage disposal plant effluent pollutant levels further, be conducive to the lasting improvement of water environment.
Embodiment 2
Most sewage treatment plant tail water B/C values are about 0.02～0.10, B/C=0.05 in the present embodiment, using embodiment 1
Device, through different proportion ferrum charcoal effect after, tail water biodegradability improve situation as shown in table 1：
The biodegradability of tail water after the effect of table 1 different proportion ferrum charcoal
| Experimental example sequence number | 1 | 2 | 3 | 4 | 5 | 6 |
| MFe/MC | 0.5:1 | 2:1 | 4:1 | 5:1 | 6:1 | 8:1 |
| B/C | 0.08 | 0.17 | 0.23 | 0.27 | 0.20 | 0.14 |
Table 1 shows, after the effect of ferrum charcoal, tail water B/C value significantly improves, and biodegradability is obviously improved.Ferrum charcoal mass ratio is MFe：
MC=4:1～6:When 1, after effect, B/C value, up to more than 0.2, is preferably M from improving tail water angle iron carbon ratio exampleFe：MC=5:1.
Second gravel hypothalluses Fe-C micro electrolysis are secondary reactions, and iron carbon ratio example is too high, can be competing with autotrophic denitrification generation
Strive (C+2H2O=CO2+4H++4e(E0=-0.207V), Fe-2e=Fe2+(E0=-0.44V)), should be using relatively low ferrum charcoal
Mass ratio, ferrum charcoal mass ratio is MFe：MC=0.5:1～2:1 is more suitable, and 1:1 is should in finished iron Carbon composites on market
With most widely low iron carbon ratio product, therefore preferably ferrum charcoal II ferrum charcoal mass ratio is MFe：MC=1:1.
Embodiment 3
Artificial swamp adopts cylindrical structure, internal diameter 20cm, high 65cm；Device is sequentially provided with vegetable layer 4, thick from top to bottom
Layer of sand 5, the first gravel hypothalluses 6, the second gravel hypothalluses 7, supporting layer 8 and gathering ground 10.Set in the middle part of first gravel hypothalluses
There is the online ORP electrode 14 of the first gravel hypothalluses, in the middle part of the second gravel hypothalluses 7, be provided with the second gravel hypothalluses online ORP electricity
Pole 13, described gathering ground 10 top is provided with perforation water collection sheet 9, and it is 5% and in funnelform oblique that gathering ground 10 bottom is provided with the gradient
Slope, described slope center is provided with slag-drip opening 11, and bottom is provided with support column 17.Additionally, described constructed wetland device top be provided with into
The mouth of a river, bottom is provided with outlet.In first gravel hypothalluses 6, Uniform Doped ferrum charcoal mass ratio is MFe：MC=5:1 ferrum charcoal I 15,
In second gravel hypothalluses 7, Uniform Doped mass ratio is 1:1 ferrum charcoal II 16, wherein, described ferrum charcoal I, II be diameter 10～
The bulk of 30mm.
In order to draw the preferred proportion of the doping of ferrum charcoal in gravel hypothalluses, the present invention is doped with that to account for gravel hypothalluses total respectively
The ferrum charcoal of the different proportion of quality is to obtain preference data.It is doped with gravel substrate respectively in each gravel hypothallus of experimental example 9
The ferrum charcoal I, II of layer gross mass 0.5%, is doped with gravel hypothalluses gross mass 1% in each gravel hypothallus of experimental example 10 respectively
Ferrum charcoal I, II, be doped with the ferrum charcoal I, II of gravel hypothalluses gross mass 3% in each gravel hypothallus in experimental example 11 respectively.
As a comparison, also added experimental example 7 and experimental example 8 in the present embodiment, each gravel substrate in described experimental example 7
Equal undoped p ferrum charcoal in layer, distinguishes Uniform Doped gravel hypothalluses gross mass 1% in each gravel hypothallus in experimental example 8
Ferrum, other experiment parameters are identical with experimental example 9-11.
Additionally, Performance of Constructed Wetlands Substrates coarse sands layer coarse sand particle diameter is 2～4mm, thickness is 5cm；First, second gravel hypothalluses
Grain size of gravel be 4～8mm, thickness is 20cm；The grain size of gravel of supporting layer is 8～16mm, and thickness is 5cm；Vegetable layer
From phragmites communiss, the planting density of phragmites communiss is 20 plants/m2.During test, hydraulic detention time is 2d, and artificial swamp is intake as sewage
Process plant tail water, in tail water, pollutant levels are respectively COD 52.16～62.43mg/L, TN 14.77～19.83mg/L.?
Obtain following experimental data eventually.
Experimental example 7-11 ferrum charcoal doping situation is as shown in table 2, pollutants removal rate efficiency, microbial activity and wet land system
ORP is as shown in table 3.
Table 2 wetland ferrum charcoal doping situation
| Experimental example sequence number | 7 | 8 | 9 | 10 | 11 |
| First gravel hypothalluses | No | 1% ferrum | 0.5% ferrum charcoal I | 1% ferrum charcoal I | 3% ferrum charcoal I |
| Second gravel hypothalluses | No | 1% ferrum | 0.5% ferrum charcoal II | 1% ferrum charcoal II | 3% ferrum charcoal II |
Table 3 wetland COD, TN average removal rate and microbial activity comparison
* note：Microbial activity adopts fluorescence developing method to characterize.
According to table 3, experimental example 8-11 whole year COD average removal rate exceeds 0.92% respectively than experimental example 7,
5.09%th, 10.16%, 11.64%, winter (- 2 months December) exceeds 1.14% than experimental example 7 respectively, 6.15%, 11.22%,
14.16%, show to add the removal that ferrum charcoal contributes to COD in tail water, but individually add ferrum and almost there is no effect.Experimental example 8-11
Annual TN average removal rate exceeds 4.74%, 8.36%, 13.72%, 14.34% respectively than experimental example 7, winter (- 2 months December)
Exceed 5.52%, 6.71%, 16.17%, 17.75% than experimental example 7 respectively, show that individually adding ferrum can improve artificial swamp pair
The clearance of TN, and add ferrum Carbon composites formation galvanic element lifting effect and become apparent from, and winter effect is more significantly.Pass through
It is located at the ORP on-line computing model in the middle part of the first gravel hypothalluses and in the middle part of the second gravel hypothalluses respectively to find, experimental example 7-11
First gravel hypothalluses, the second gravel hypothalluses all can be in good aerobic, anaerobic environment.Sampled by substrate, using glimmering
Light development process detects Wetland Substrate microbial activity, finds that experimental example 8-11 microbial activity is far above experimental example 7, shows to add
Ferrum charcoal and ferrum, all can improve microbial activity of artificial wetland, and after interpolation ferrum charcoal or ferrum, winter microbial activity reaches as high as not
2.3 times adding.With the raising of ferrum charcoal doping ratio, COD, TN clearance and microbial activity are all in rising trend, but mix
Miscellaneous ratio, to after 1%, continues to improve doping ratio, and lifting amplitude less, simultaneously takes account of Cost Problems, doping ratio is preferably
1%.
Embodiment 4
Because tail water electrical conductivity is not very high, and tail water pH is usually closer to 7, and chemical dissolution is less, so ferrum in substrate
Charcoal consumes relatively slowly, continuously available.During plant running 18 months, in ferrum charcoal, iron ion stably continues dissolution, and does not have
Find obvious clogging, the ferrum charcoal of 0.5%-1% can be supplemented after plant running 2-3.
The above be only the preferred embodiment of the present invention it should be pointed out that：Embodiments of the present invention are not subject to above-mentioned
The restriction of embodiment, under the premise without departing from the principles of the invention, the modification made under any present principles, replacement, combination, all should
For equivalent substitute mode, it is included within protection scope of the present invention.
Claims (10)
1. a kind of constructed wetland device for sewage treatment plant tail water advanced nitrogen it is characterised in that：Described at sewage
The constructed wetland device of reason plant tail water advanced nitrogen is followed successively by vegetable layer (4), coarse sands layer (5), the first gravel substrate from top to bottom
Layer (6), the second gravel hypothalluses (7), supporting layer (8) and gathering ground (10)；
It is provided with the online ORP electrode of the first gravel hypothalluses (14) in the middle part of described first gravel hypothalluses (6)；
It is provided with the online ORP electrode of the second gravel hypothalluses (13) in the middle part of described second gravel hypothalluses (7)；
Described gathering ground (10) top is provided with perforation water collection sheet (9), and gathering ground (10) bottom is provided with the gradient and is 5% and is in funnel-form
Slope, described slope center is provided with slag-drip opening (11), additionally, gathering ground (10) bottom is provided with support column (17)；
The described constructed wetland device top for sewage treatment plant tail water advanced nitrogen is provided with water inlet, and bottom is provided with water outlet
Mouthful；
Described first gravel hypothalluses (6) Uniform Doped ferrum charcoal I (15), ferrum charcoal mass ratio M in described ferrum charcoal I (15)Fe：MC=2:
1～6:1；
Described second gravel hypothalluses (7) Uniform Doped ferrum charcoal II (16), ferrum charcoal mass ratio M in described ferrum charcoal II (16)Fe：MC=
0.5:1～2:1.
2. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1 it is characterised in that：
Described ferrum charcoal I (15) is the bulk of diameter 10～30mm, and in ferrum charcoal, ferrum charcoal mass ratio is preferably MFe：MC=5:1.
3. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1 it is characterised in that：
Described ferrum charcoal II (16) is the bulk of diameter 10～30mm, and in ferrum charcoal, ferrum charcoal mass ratio is preferably MFe：MC=1:1.
4. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1 it is characterised in that：
The coarse sand particle diameter of described coarse sands layer (5) is 2～4mm.
5. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1,2 or 3, its feature
It is：The grain size of gravel of described gravel hypothalluses is 4～8mm, and the doping ratio of described ferrum charcoal is gravel hypothalluses gross mass
0.5%～3%.
6. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 5 it is characterised in that：
The doping ratio of described ferrum charcoal is preferably the 1% of gravel hypothalluses gross mass.
7. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1 it is characterised in that：
Described supporting layer (8) is made up of gravel, and described grain size of gravel is 8～16mm.
8. the constructed wetland device for sewage treatment plant tail water advanced nitrogen according to claim 1 it is characterised in that：
Described perforation water collection sheet (9) open pore size is 5mm, and percent opening is 8.25%.
9. application in sewage treatment plant tail water advanced nitrogen for the constructed wetland device according to claim 1.
10. according to claim 9 application it is characterised in that：
1) tail water enters vegetable layer (4) from wetland device top, directly absorbs the nitrogen P elements in sewage using plant；
2) after carrying out initial absorption, tail water enters into coarse sands layer (5), removes oarse-grained float；
3) pretreated tail water enters the first gravel hypothalluses (6), is divided complicated larger molecular organicses by ferrum charcoal galvanic element
Solve as small organic molecule；
4) tail water after processing enters the second gravel hypothalluses (7), through denitrifying bacterium heterotrophic denitrification and the anti-nitre of electrolytic hydrogen production
Change effect carries out denitrogenation to tail water, and described denitrifying bacterium is microsphere denitrifying bacterium.
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