CN1821125A - Method and its device for denitrifying and removing pollutant of waste water - Google Patents
Method and its device for denitrifying and removing pollutant of waste water Download PDFInfo
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- CN1821125A CN1821125A CNA200610049797XA CN200610049797A CN1821125A CN 1821125 A CN1821125 A CN 1821125A CN A200610049797X A CNA200610049797X A CN A200610049797XA CN 200610049797 A CN200610049797 A CN 200610049797A CN 1821125 A CN1821125 A CN 1821125A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The denitrifying and pollutant removing waste water treating method and apparatus has artificial wet land with planted woody and herbal plant. It includes a waste water introducing area for flocculating and filtering waste water and initially decomposing carbon and nitrogen containing organic matter; an aerating tower area for further aerobic decomposing of organic matter and nitrifying ammonia nitrogen and with two or more layer of wet land to form tower; and a waste water merging area connected to the lower part of the aerating tower area for denitrifying nitrate nitrogen, decomposing the rest organic matter and draining treated water. The denitrifying and pollutant removing waste water treating apparatus may be formed into a landscape to beautify environment while treating waste water.
Description
Technical field
The present invention relates to a kind of ecology treatment technology of sewage water denitrification scrubbing, particularly about the technological method and the device thereof of efficient denitrification scrubbing in the process of sewage disposal.
Background technology
Along with the increase of quantity of wastewater effluent, most of surface water of China and part shallow ground water pollute serious day by day, can not get effective control if water pollutes, and will directly influence sustainable economic development and water supply security.Even under the secure prerequisite of fund, also can not realize the fundamental turn for the better of aquatic ecosystem merely by sewage work.Because high investment and working cost makes various secondarys, three grades of water technologies be difficult to big area and promote.Investigation shows, the nitrogen in lake and the river has and derives from pollution of area source more than 50%, and widespread pollution from the overuse of fertilizers and pesticides in rural area has become the principal element of water environment pollutions such as lake, river, the pool, storehouse.The sewage disposal of Rural areas is blank basically, a large amount of unprocessed rivers that just directly enter.The band network of waterways, Jiangsu and Zhejiang Provinces one, lake are numerous, and body eutrophication is serious, although a lot of other all contaminants level of tap water reservoir is all very low, nitrogen content exceeds standard.Effectively the control industrial and agricultural production is significant for the control body eutrophication with the pollutents such as nitrogen that life is brought.
Artificial swamp is the artificial ecosystem of simulating nature wetland, is a kind ofly artificially one or more media such as stone, sand, soil, cinder to be constituted matrix by a certain percentage, and implants the sewage disposal ecosystem of plant selectively.Realize purification by physics, chemistry and biological triple synergies in the natural ecosystems to sewage.Stromal surface and plant rhizosphere adsorb a large amount of microorganisms and form microbial film, and effluent stream is when microbial film, and a large amount of suspended solidss is held back by matrix and root system of plant, and organic pollutant is removed by biomembranous absorption, assimilation and dissimilation.Discharge because of the transmission of root system of plant in the wet land system oxygen, make it present aerobic, anoxic and anaerobic state successively, guaranteed that the nitrogen phosphorus in the sewage can not only be absorbed as nutrition by plant and microorganism, also can to the absorption accumulation of phosphorus it have been removed from sewage by nitrated, denitrification and microorganism.Artificial swamp has investment and plurality of advantages such as working cost is low, anti-shock loading, treatment effect is stable, effluent quality is good, waterplant can utilize as a kind of novel ecological sewage disposal technology.Though artificial swamp has obtained some application in sewage disposal, obtained reasonable effect, also has some problems, be difficult to remove as the ammonia nitrogen in the sewage, nitrogen removal efficiency is low, generally is no more than 60%, and can not remove sustainedly and stably, water quality is difficult to up to standard.Because ammonia nitrogen is one of limiting factor that causes body eutrophication, the denitrogenation ability of necessary strengthened artificial wet land.
People such as Liu Chaoxiang [environmental science, 2003,24 (5): 92-96] are to the analysis revealed of nitrogen removal approach, and nitrated-denitrification of microorganism is the main path that artificial swamp is removed nitrogen, and waterplant accounts for more than 10% of total dosage respectively to the absorbed dose of nitrogen.People's such as Zhang Jiayao [Research of Environmental Sciences, 1999,19 (3): 323-327] research also shows, improve the denitrification effect of wetland, key is to improve the oxygen environment of wetland, thereby improves nitrification, so as to guarantee wetland nitrated-this important denitrification mechanism of denitrification unimpeded.Foreign study finds that also nitrated-denitrification is the main mode of wetland denitrogenation, and the amount of denitrogenating accounts for the 60-95% of total denitride amount.And plant is very low to the absorbed dose of nitrogen, is 0.03-0.3g/m
2D, and to finally finish the removal of nitrogen by gathering in plant.There are some researches show artificial swamp under the moderate duty situation, by plant harvesting to the clearance of nitrogen less than 20%.As seen, nitrated-denitrification is the main mechanism of artificial swamp denitrogenation.People such as Song Tiehong [Jilin Construction Engineering Academy journal, 2003,20 (3): 1-3] discover that oxygen level is removed efficient to wetland in the artificial swamp considerable influence, improves wetland bed intravital oxygen level, helps good oxygen metabolism and the nitrification of microorganism.Rate of nitrification is slow more a lot of than denitrification rate in many wetlands, and in fact becomes the limiting factor that control nitrogen is removed.Revolution 1g NH
4 +-N becomes NO
3 --N needs to consume 4.3g oxygen.NH for 1.0mg/L
4 +-N, when dissolved oxygen was greater than 4.6mg/L in the system, nitrifying process could carry out smoothly.No matter be the surface current wetland, or current wetland, oxygen level all is limiting factor [the Water Environment Research of carbon and nitrogen oxidation, 1997,67 (5): 855-862]], and the oxygen of plant transmission is limited in the wetland, and reed, submerged plant, floating plant are respectively 0.02-12,0.5-5.2,0.25-9.6g/m
2D.
Remove the efficient of ammonia nitrogen in order to improve artificial swamp, Green[Water Environment Research, 1994,66 (4): 188-193] take manual inflation's way to increase dissolved oxygen in the wetland, improve nitrated ability with this, the result has improved ammonia-N removal rate greatly, but dissolved oxygen is when increasing, suppressed the carrying out of denitrification, thereby the clearance of nitric nitrogen is descended to some extent.The clearance that guarantees nitric nitrogen when how to improve ammonia nitrogen removal frank is a difficult point that strengthens the artificial swamp denitrification effect.Every denitrification 1g NO
3-N becomes N
2, needing to consume the organism that is equivalent to 2.86gBOD, it is 1 that denitrifying minimum carbon nitrogen mass ratio may take place.Yet the degraded of COD mainly occurs in the leading portion of wetland bed body, causes the waste of required organic carbon source deficiency of a body back segment denitrification and back segment degradation capability.When organic matter of sewage content was very low, denitrification process was difficult for again carrying out, and solving this contradiction is to improve artificial swamp another difficult point to nitrogen removal efficiency.Therefore, effectively remove the nitrogen in the sewage, must ensure in the water has sufficient dissolved oxygen to finish NH
4 +-N's is nitrated, makes suitable anaerobic environment of denitrifying bacterium and competent organism source simultaneously again, to ensure carrying out smoothly of denitrification.
Summary of the invention
The present invention is directed in the present artificial swamp sewage disposal, nitrification needs aerobic environment, and denitrification needs the contradiction between anaerobic environment and the certain organism carbon source, the solution nitrogen removal efficiency is low, thereby the technical problem that causes the eutrophication of water body, the method that designs a kind of tower sewage water denitrification decontamination apparatus and dispose of sewage.
The present invention realizes above-mentioned purpose by the following technical solutions.
A kind of sewage water denitrification decontamination apparatus comprises top layer earth, middle level sand grains and bottom gravel.Woody or the herbaceous plant of plantation on the earth of top layer is introduced the sewage that flows and forms artificial swamp.It is characterized in that: a sewage is introduced the district, is used to flocculate and the preliminary decomposition of filtering-depositing sewage and carbon containing, nitrogen organic, introduces terminal water pump and the water pipe of establishing lifting sewage in district at sewage; One aerating tower area, be used for the further aerobic decomposition of carbon containing, nitrogen organic and the nitrification of ammonia nitrogen, be stacked into turriform by the surface current artificial wetland more than two layers, tower lower floor and sewage are introduced the district and are fused, and the lifting water pipe that sewage is introduced the district extends to top layer tower middle part; One sewage merge area, lower floor fuses with aerating tower area, the water outlet after being used for the denitrification and the rest organic matter decomposition of nitric nitrogen and discharging the denitrogenation scrubbing.
A kind of sewage water denitrification method for separating polluted particles, its feature may further comprise the steps:
A, the sewage of artificial swamp is introduced district's plantation xylophyta, aerating tower area and sewage merge area plantation herbaceous plant, root system of plant provides flocculation and precipitating action, and the sewage of carbon containing, nitrogen organic is tentatively degraded;
B, the sewage that will handle are introduced the sewage treating artificial wet land device, after wherein a part is introduced district's xylophyta artificial swamp through sewage, directly enter the bottom of aerating tower area artificial swamp, carry out organic degraded while flowing, with flowing into sewage merge area by the sewage that falls to lower floor under the aerating tower area top layer.
C, another part sewage promote the top layer middle part that enters aerating tower area by pump and water pipe, and sewage drops to down one deck wetland by the upper strata wetland, falls the oxygen that makes in the abundant dissolved air of sewage through the multi-step formula, carries out the aerobic decomposition of organism, NH
4 +-N nitrification becomes NO
3 --N flows into sewage merge area artificial swamp;
D, the sewage that is gone on foot after handling by described b step and c carry out denitrification through sewage merge area artificial swamp, with NO in the sewage
3-N is converted into N
2And be discharged in the atmosphere, carbonaceous organic material further resolves into carbonic acid gas and water.
Artificial wet land system is introduced district and aerating tower area employing surface current wetland at sewage, adopts current wetland in sewage merge area.
Wet land filler can divide 3 layers from top to bottom: the top layer is a soil, and the middle level is a cinder, and bottom is a gravel.
Aquatic herbaceous plant and xylophyta can be selected configuration according to the suitable non-hibernating eggs class in locality in the wetland, as have cash crop Lin grass, wild rice stem etc. of Ningbo characteristic.
Sewage is earlier through planting the introducing district artificial swamp of xylophyta, utilize the root system flocculation of xylophyta, the suspended solid material in the precipitation sewage, it is higher that sewage is introduced the Pollutant levels of distinguishing, the plant absorbing nutritive substance is many, growth is fast, xylophyta is bigger than herbaceous plant biomass, and unlikely causing grown too fast and a series of problems that produce.The artificial swamp organism partly decomposes in the introducing district, little wetland staircase drop enters lower floor's wetland to part of contaminated water from the aerating tower area top then, sewage makes full use of the atmosphere oxygen enrichment in drop, the aerobic decomposition of organism is quickened, and organonitrogen decomposes original ammonia nitrogen in the ammonia nitrogen that produces and the sewage is converted to nitric nitrogen under aerobic condition rate of nitrification and increases substantially; Another part sewage is then from introducing the bottom that district's artificial swamp end directly enters tower wetland, descend with the drop of aerating tower wetland top layer ladder, nitrification is complete, aerobic decomposition sewage comparatively completely converges together, this part directly enters the sewage of tower bottom without tower wetland drop, only carried out preliminary aerobic decomposition, the denitrification that remaining organism can be sewage merge area provides carbon source, guaranteed the unimpeded smoothly of this main denitrogenation mechanism of nitrated-denitrification, make nitric nitrogen thoroughly be converted into nitrogen and discharge into the atmosphere, thereby improve the denitrogenation scrubbing effect of sewage.
The present invention has designed tower artificial swamp and has compared with the artificial swamp of present employing, can improve the removal effect of nitrogen in the sewage, the sewage nitrogen removal rate is 70%～80%, ammonia nitrogen removal frank is 75-85%, and the removal effect of all the other pollution factors also increases, and COD of sewage cr clearance is 85%～90%; The total tp removal rate of sewage is 60～70%, and total suspended solid TSS clearance is 80～85%.The floor space of novel artificial wetland, investment, operational management and cost and all the other artificial swamps are basic identical, only need to consume small amount of electrical energy and flood, and are fit to small and medium-sized cities and vast Rural areas and use.
Marked improvement of the present invention and advantage are:
(1) the tower ladder drop oxygenation of sewage, the nitrification of the enhanced biological oxygen metabolism of becoming reconciled.Only need to consume small amount of electrical energy and flood, the drop several times of little wetland branch enters the little wetland of lower floor from the upper strata to make sewage, and it is few to overcome present wetland oxygen level, the bottleneck that rate of nitrification is slow.
(2) part of contaminated water directly enters sewage merge area, for biological denitrification provides competent carbon source, improves denitrification efficient.Can avoid simultaneously the waste of wetland back segment cleaning action.
(3) xylophyta and herbaceous plant are combined.The clearance of artificial swamp to pollutent improves in the collaborative mixed biologic group that utilizes two class roots of plants districts, reduces the vulnerability of wet land system, improves its vitality.
(4) environment, society, ecology, economic benefit four good harvests.On the ridge between circular wetland, just as between the waterfall of Lakeside Park, taking a walk, allow the visitor obtain education and inspire, the effect of understanding wetland, the better protection environment, one beautiful view only is not the ecological base of Environmental education yet.A small sewage treatment plant at county level, several ten million yuan at least of investments, sewage disposal expense 0.5-1 unit/ton, will spend several thousand yuan every day.And the investment cost of artificial swamp is about 2,000,000 yuan (comprising fees paid for taking rural land), and processing costs is no more than 0.05 yuan/ton, and no excess sludge produces, and just clears up channel and management crop in the maintenance, and the peasant can bear fully, only needs indivedual professionals to make regular check on.
The novel artificial wetland technology of this project was both disposed of sewage, both can improve the sanitary condition of vast rural area and small and medium-sized cities, can beautify the environment again, slow down the eutrophication trend of surface water, be the sewage disposal mode that integrates environmental benefit, economic benefit and social benefit.
Description of drawings
Fig. 1 is tower artificial wet land system structural representation;
Fig. 2 is the longitudinal diagram of tower artificial wet land system structure.
Embodiment
The artificial swamp that this test is adopted is laboratory scale constructed wetland device, the length that sewage is introduced district 1 is 0.8m * 0.7m * 0.5m, the length of sewage merge area 3 is that top layer 7 little wetland diameter 0.6m, middle layer 8 diameters of 0.8m * 0.7m * 0.5m, aerating tower area 2 are 1.0m, the diameter of lower floor 5 is 1.4m, the height of three layers of wetland is 0.5m, total height is 1.5m, and the total area of whole wet land system is 3.73m
2The bottom 13 of wet land system is the thick gravel of 10cm (particle diameter 2-6cm), and middle level 12 is the thick cinder of 10cm (particle diameter 0.2-0.5cm), and top layer 11 is the thick earth of 10cm (particle diameter 0.1-0.2cm).Introduce the leading portion in district 1 at wetland sewage and plant xylophytas 10 such as flowers sapling, metasequoia sapling, at its sewage merge area plantation rye grass, Sheathed Monochoria and Lin's grass, wild rice stem 4 etc., plant the landscape type herbaceous plant aerating tower area 7,8 kind, as shown in Figure 1 as Canna generalis Bailey, cattail, wilson iris, Bulbus Cardiocrini Cathayani etc.Aerating tower area is made up of three layers of little artificial swamp, and the little artificial swamp of each layer be all by top layer 11 soil, middle level 12 cinders, and bottom 13 gravels are formed, and establish dividing plate 17 between the tower layer with sewage permeation between trapping layer, as shown in Figure 2.Sewage flows forward through a part of along continuous straight runs 9 of the leading portion of artificial swamp, some infiltrates through middle level 12 and bottom 13, establish water leg and suction water pump 15 at this, to be promoted to the middle level of the little wetland of top layer 7 at the part sewage of middle level seepage flow through water pipe 14, emitting water is overflowed by topsheet surface, form waterfall stream and successively fall, in the drop process, absorb airborne oxygen.
Set up the big or small identical surface current wet land system of an area simultaneously in contrast, the sewage inhalant region is identical with the complete and above-mentioned novel wetland of exhalant region, and the wetland middle part is common surface current wetland.Wet land filler and floristics are also identical with tower artificial swamp.
Embodiment 1: (COD is 300mg/L, BOD to import the simulated domestic wastewater of identical water quality with identical hydraulic load (20cm/d) to two artificial wet land systems
5Be 160mg/L, total nitrogen concentration is 70mg/L, and ammonia nitrogen concentration is 40mg/L, and total phosphorus concentration is 4mg/L), hydraulic detention time is 3d.Treatment effect sees Table 1.
Table 1 novel artificial wetland is to the removal effect (%) of pollutent
| The COD clearance | Nitrogen removal rate | Ammonia nitrogen removal frank | Total tp removal rate | The TSS clearance | |
| The common artificial swamp of novel artificial wetland | 86.52 77.86 | 79.02 67.33 | 76.92 60.61 | 68.59 65.52 | 82.33 80.46 |
Embodiment 2: (COD is 70mg/L to import the farmland discharging-irrigating water of identical water quality with identical hydraulic load (20cm/d) to two artificial wet land systems as different from Example 1, total nitrogen concentration is 7mg/L, ammonia nitrogen concentration is 4mg/L, and total phosphorus concentration is 1mg/L), hydraulic detention time is 2d.Treatment effect sees Table 2.
Table 2 novel artificial wetland is to the removal effect (%) of pollutent
| The COD clearance | Nitrogen removal rate | Ammonia nitrogen removal frank | Total tp removal rate | The TSS clearance | |
| The common artificial swamp of novel artificial wetland | 88.24 79.64 | 83.63 66.26 | 77.78 58.67 | 69.96 65.21 | 81.76 78.68 |
Embodiment 3: (average water quality: COD is 270mg/L, BOD to import the mixing sanitary sewage of identical water quality and livestock breeding wastewater with identical hydraulic load (20cm/d) to two artificial wet land systems as different from Example 1
5Be 120mg/L, total nitrogen concentration is 40mg/L, and ammonia nitrogen concentration is 28mg/L, and total phosphorus concentration is 3.5mg/L), hydraulic detention time is 2d.Treatment effect sees Table 3.
Table 3 novel artificial wetland is to the removal effect (%) of pollutent
| The COD clearance | Nitrogen removal rate | Ammonia nitrogen removal frank | Total tp removal rate | The TSS clearance | |
| The common artificial swamp of novel artificial wetland | 88.72 79.64 | 79.17 67.03 | 79.38 57.18 | 66.13 65.19 | 77.22 73.89 |
Embodiment 4: (average water quality: COD is 680mg/L to waste water, BOD after importing the pig farm anaerobic treatment of identical water quality to two artificial wet land systems with identical hydraulic load (20cm/d) as different from Example 1
5Be 300mg/L, total nitrogen concentration is 80mg/L, and ammonia nitrogen concentration is 45mg/L, and total phosphorus concentration is 3mg/L), hydraulic detention time is 3d.Treatment effect sees Table 4.
Table 4 novel artificial wetland is to the removal effect (%) of pollutent
| The COD clearance | Nitrogen removal rate | Ammonia nitrogen removal frank | Total tp removal rate | The TSS clearance | |
| The common artificial swamp of novel artificial wetland | 87.06 79.64 | 82.22 73.03 | 76.67 57.21 | 70.10 66.12 | 77.29 71.32 |
Embodiment 5: (average water quality: COD is 52mg/L, BOD to import the eutrophication river of identical water quality with identical hydraulic load (20cm/d) to two artificial wet land systems as different from Example 1
5Be 4.8mg/L, total nitrogen concentration is 1.8mg/L, and ammonia nitrogen concentration is 0.8mg/L, and total phosphorus concentration is 0.08mg/L), hydraulic detention time is 1d.Treatment effect sees Table 5.
Table 5 novel artificial wetland is to the removal effect (%) of pollutent
| The COD clearance | Nitrogen removal rate | Ammonia nitrogen removal frank | Total tp removal rate | The TSS clearance | |
| The common artificial swamp of novel artificial wetland | 87.06 73.64 | 80.20 70.12 | 77.66 53.11 | 61.87 58.63 | 75.90 70.35 |
Embodiment 6: the artificial swamp that this test is adopted is the on-the-spot artificial swamp of open-air pilot scale, and the length that sewage is introduced the district is 6m * 4.5m * 1m; The length that sewage converges treatment zone is 6m * 4.5m * 1m; The little wetland diameter of the top layer of aerating tower area 3m, middle layer diameter are 6m, and lower floor's diameter is 10m, and the height of three layers of wetland is 1m, and total height is 3m, and the total area of whole wet land system is 509m
2The bottom of whole wet land system is the thick gravel of 12cm (particle diameter 2-6cm), and the middle level is the thick cinder of 12cm (particle diameter 0.2-0.5cm), and the top layer is the thick soil of 12cm (particle diameter 0.1-0.2cm).Introduce xylophytas such as district's entry place plantation flowers sapling, metasequoia sapling at the sewage of wetland, at sewage merge area plantation rye grass, Sheathed Monochoria and Lin's grass, wild rice stem etc., aerating tower area plantation landscape type herbaceous plant, as Canna generalis Bailey, cattail, wilson iris, Bulbus Cardiocrini Cathayani etc.With steady running under the hydraulic load of 20cm/d 5 months (hydraulic detention time is 3-5d), test used sewage from the rural area irrigation canals and ditches, these irrigation canals and ditches are through farmland and villages and small towns, and sewage is based on sanitary sewage, be mixed with part farmland discharging-irrigating water and rainwater, water quality and treatment effect are as shown in table 6.
Table 6 sewage quality and treatment effect
| COD | BOD 5 | Total nitrogen | Ammonia nitrogen | Total phosphorus | pH | SS | |
| Water quality (mg/L) clearance (%) | 55-86 86.15 | 26-42 89.66 | 3-8 80.91 | 2-5 86.03 | 0.6-1.0 67.17 | 7.0-8.0 / | 16-35 84.53 |
Claims (6)
1, a kind of sewage water denitrification decontamination apparatus comprises top layer earth, middle level sand grains and bottom gravel.Woody or the herbaceous plant of plantation on the earth of top layer is introduced the sewage that flows and forms artificial swamp.It is characterized in that: a sewage is introduced district (1), is used to flocculate and the preliminary decomposition of filtering-depositing sewage and carbon containing, nitrogen organic, introduces terminal water pump and the water pipe of establishing lifting sewage in district at sewage; One aerating tower area (2), be used for the further aerobic decomposition of carbon containing, nitrogen organic and the nitrification of ammonia nitrogen, be stacked into turriform by the surface current artificial wetland more than two layers, tower lower floor (5) introduces the district with sewage and fuses, and the lifting water pipe (14) that sewage is introduced the district extends to top layer (7) tower middle part; One sewage merge area (3), lower floor fuses with aerating tower area, the water outlet after being used for the denitrification and the rest organic matter decomposition of nitric nitrogen and discharging the denitrogenation scrubbing.
2, sewage water denitrification decontamination apparatus according to claim 1 is characterized in that it is surface current wetland district that sewage is introduced district (1), and aerating tower area (2) is surface current wetland district, and sewage merge area (3) is the current wetland district.
3, sewage water denitrification decontamination apparatus according to claim 1 is characterized in that artificial swamp top layer (11) soil particle diameter is 0.1-0.2cm, and middle level (12) are the cinder of 0.2-0.5cm, and bottom (13) is the gravel of particle diameter 2-6cm.
4, sewage water denitrification decontamination apparatus according to claim 1, it is characterized in that introducing district (1) plantation metasequoia sapling and flowers sapling (10) at sewage, aerating tower area (2) plantation landscape type herbaceous plant, at sewage merge area (3) plantation rye grass, Sheathed Monochoria and Lin's grass (4).
5, a kind of sewage water denitrification method for separating polluted particles, its feature may further comprise the steps:
A, the sewage of artificial swamp is introduced district's plantation xylophyta, aerating tower area and sewage merge area plantation herbaceous plant, root system of plant provides flocculation and precipitating action, and the sewage of carbon containing, nitrogen organic is tentatively degraded;
B, the sewage that will handle are introduced the sewage treating artificial wet land device, after wherein a part is introduced district's xylophyta artificial swamp through sewage, directly enter the bottom of tower artificial swamp, carry out organic degraded while flowing, with flowing into sewage merge area by the sewage that falls to lower floor under the aerating tower area top layer.
C, another part sewage promote the top layer middle part that enters aerating tower area by pump, and sewage drops to down one deck wetland by the upper strata wetland, falls the oxygen that makes in the abundant dissolved air of sewage through the multi-step formula, carries out the aerobic decomposition of organism, NH
4 +-N nitrification becomes NO
3 --N flows into sewage merge area artificial swamp;
D, the sewage that is gone on foot after handling by described b step and c carry out denitrification through sewage merge area artificial swamp, with NO in the sewage
3 --N is converted into N
2And be discharged in the atmosphere, carbonaceous organic material further resolves into carbonic acid gas and water.
6, sewage water denitrification method for separating polluted particles according to claim 5 is characterized in that the sewage nitrogen removal rate is 70%～80%, and ammonia nitrogen removal frank is 75～85%, and total tp removal rate is 60%～70%, and total suspended solid TSS clearance is 80～85%, COD of sewage
CrClearance is 85%～90%.
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