CN105399208A - Enhanced constructed wetland denitration system and method - Google Patents
Enhanced constructed wetland denitration system and method Download PDFInfo
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- CN105399208A CN105399208A CN201510804276.XA CN201510804276A CN105399208A CN 105399208 A CN105399208 A CN 105399208A CN 201510804276 A CN201510804276 A CN 201510804276A CN 105399208 A CN105399208 A CN 105399208A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The invention relates to the technical field of sewage treatment, in particular to an enhanced constructed wetland denitration system and method. The constructed wetland denitration system comprises a first treatment zone provided with solid carbon source adding pipes which are vertically and uniformly arranged in the whole first treatment zone, organic carbon is released uniformly, and the utilization rate is high. The constructed wetland denitration system further comprises a second treatment zone free of organic carbon release, and the second treatment zone is used for decomposing organic carbon which is not used sufficiently and further removing nitrogen elements in various forms, and secondary environmental pollution after emission of the organic carbon which is not used sufficiently is avoided on the basis that the treatment effect is improved. According to the denitration method, waste straw is taken as a solid carbon source, the cost is low, the method is applicable to large-scale denitration treatment of low-carbon high-nitrate-nitrogen wastewater, gaps among the straw are larger, and produced fermentation gas and the like can be exhausted from the upper parts of the adding pipes.
Description
Technical field
The present invention relates to technical field of sewage, be specifically related to a kind of intensified type artificial swamp denitrating system and method.
Background technology
Nitrogen element in sewage treatment plant tail water, agriculture rainwash, greenhouse cultivation waste water etc. is greatly mainly with nitre nitrogen (NO
3 --N) form exist, be the important factor causing earth's surface and body of groundwater water environment pollution problem.
Artificial swamp be a kind of with low cost, build the easy green ecological water purification technology of operational management, it utilizes the pollutent in the synergy removal water of plant, matrix, microorganism etc., and wherein the effect of microorganism heterotrophic denitrification is the main approach removing nitre nitrogen.The inner oxyty of horizontal drowned flow artificial wet land is usually lower, for denitrification except nitre effect provides good condition.But above-mentioned being rich in the waste water of nitre nitrogen can be denitrification and provides the content of the organic carbon of electronics and energy usually lower, significantly limit the denitration usefulness of artificial swamp.
In prior art, in order to increase the content of organic carbon in artificial swamp, often add effectively to improve its denitrification capability to artificial swamp with liquid carbon source such as methyl alcohol, glucose, solid carbon source hydrolyzed solutions, but exist cost compared with high, control difficulty greatly, easily produce secondary pollution problems; The organic polymer of synthetic then costly, is not suitable for the extensive denitrogenation processing of " low-carbon (LC) height nitre nitrogen " waste water.
Discarded plant matter, if agricultural crop straw, trees litter, gardening waste etc. are as a class natural cellulose carbon source, can effectively alleviate or eliminate above-mentioned inferior position, meanwhile, utilizes discarded plant matter can also realize its minimizing and resource utilization for carbon source.But, with in the practical application of discarded plant matter for carbon source strengthened artificial wet land denitrification denitration usefulness in prior art, there is the problems such as effluent color dilution is higher, carbon source release is uneven.In addition, in dosing method, buried the adding of conventional hybrid or layer easily causes wetland to block, and Wetland Function is significantly reduced; Cannot change it after carbon source loses efficacy; Carbon source progressively consumes decrement and is unfavorable for the stable of Wetland Substrate structure, and the gas produced in its fermenting process also can accumulate on wetland inside cannot discharge.Top layer adds or arranges the preposition pond that adds and then makes carbon source effect be confined near carbon source or add the region in pond, is difficult to reach good denitration effect, and carbon source adds in pond and is difficult to plant wetland plant, is unfavorable for the total tune of wetland.The improper organic substance of release etc. that also may cause of carbon source arbitrary way utilizes not exclusively and forms secondary pollution.
Given this, overcome above defect of the prior art, provide a kind of new artificial swamp denitrating system to become this area technical problem urgently to be resolved hurrily.
Summary of the invention
The object of the invention is to the above-mentioned defect for prior art, a kind of intensified type artificial swamp denitrating system and a kind of method of denitration based on this denitrating system are provided.
Object of the present invention realizes by following technical measures:
A kind of intensified type artificial swamp denitrating system, compared with prior art, its difference is, this system comprises:
Horizontal-flow wetland treating pond, at least one particulate substrates is filled with in the bed body of described horizontal-flow wetland treating pond, described particulate substrates is along water (flow) direction step-by-step arrangement, be followed successively by inhalant region, the first treatment zone, the second treatment zone, exhalant region and catchment area, described first treatment zone and described second treatment zone plantation have at least one moisture loving plant;
Multiple evenly distributed and the solid carbon source being vertically arranged at described first treatment zone adds pipe, the tube wall that described solid carbon source adds pipe is provided with multiple through hole;
Conduit means, it comprises and extends to the first conduit of described inhalant region, the second conduit extending to catchment area from described exhalant region and the 3rd conduit extended from described catchment area from source of sewage; And
Intake pump, it is for being delivered to described horizontal-flow wetland treating pond by sewage by described first conduit;
Wherein, solid carbon source is waste straw.
Preferably, filtering net is furnished with in the through hole that described solid carbon source adds pipe.
Preferably, described solid carbon source adds pipe and is built-in with at least one Nylon Bag for holding solid carbon source.
Preferably, multiple solid carbon source adds pipe arrangement in plum blossom-shaped.
Preferably, the particulate substrates of described inhalant region and exhalant region is the gravel of particle diameter 20 ~ 30mm, and the particulate substrates of described first treatment zone and the second treatment zone is the gravel of particle diameter 8 ~ 15mm.
Preferably, described moisture loving plant is selected from one or more in cattail, Canna generalis Bailey and reed.
Preferably, solid carbon source adds pipe is pvc pipe.
Present invention also offers a kind of intensified type artificial swamp method of denitration, compared with prior art, its difference is, by sewage successively by series connection the first horizontal flow artificial wetland processing unit and the second horizontal flow artificial wetland processing unit purify, wherein, introduce solid carbon source in described first horizontal flow artificial wetland processing unit, described solid carbon source is waste straw.
Preferably, described solid carbon source comprises carnation waste straw and rose waste straw.
Preferably, described solid carbon source is that carnation waste straw and rose waste straw mix by weight 1:1.
Preferably, described method of denitration comprises the steps:
A) the artificial swamp denitrating system that above-mentioned is provided;
B) open conduit means, introduce artificial swamp denitrating system with suitable flooding quantity sewage continuously from the first conduit;
C) supplement solid carbon source to add in pipe to solid carbon source.
Artificial swamp denitrating system of the present invention comprises and has the first treatment zone that solid carbon source adds pipe, and it is evenly distributed to add pipe Vertical dimension in whole first treatment zone, and evenly, utilization ratio is high in organic carbon release; Denitrating system artificial swamp of the present invention also comprises the second treatment zone without organic carbon release, for decomposing the organic carbon be not fully used and the nitrogen element removing various form further, the secondary pollution after the basis of improving treatment effect being avoided the organic carbon do not utilized completely discharge, environment caused; Method of denitration of the present invention is using waste straw as solid carbon source, with low cost, is applicable to the extensive denitrogenation processing of " low-carbon (LC) height nitre nitrogen " waste water.
Accompanying drawing explanation
Fig. 1 is the vertical cross-section of the denitrating system according to an embodiment of the invention;
Fig. 2 is the vertical view of the denitrating system according to an embodiment of the invention.
Fig. 3 is the structural representation adding pipe according to the solid carbon source of an embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Term used herein " wetland " refers to be present in ground, at least partly and the quashy ground of class that isolates of environment, it is characterized in that having higher water content, there is moisture loving plant.Artificial swamp is filled with granulated material usually, and it comprises soil, sand, tuff and gravel, and can layered arrangement.
Embodiments provide a kind of intensified type artificial swamp denitrating system, it is set up based on a horizontal-flow wetland, in order to increase the organic carbon that denitrifying bacterium needs, the embodiment of the present invention is introduced in artificial swamp using waste straw as solid carbon source, continue to produce the utilizable organic carbon of denitrifying bacterium by solid carbon source hydrolysed ferment, in order to ensure the even release of organic carbon, the denitrating system of the present embodiment comprises multiple solid carbon source and adds pipe (adding solid carbon source in pipe), it is evenly distributed in treatment zone, it has multiple evenly distributed through hole, the organic carbon that molecule is less is released in treatment zone from through hole.In order to avoid organic carbon is not fully used the secondary pollution of generation, except having the treatment zone of lasting organic carbon supply in the denitrating system of the present embodiment, be also provided with one without the common process district of organic carbon sustaining supply to utilize organic carbon and enhancing nitrogen removal ability further.In order to reduce costs, meet large-scale use, the denitrating system of the present embodiment adopts waste straw as solid carbon source.
The denitrating system of the present embodiment comprises: horizontal-flow wetland treating pond, conduit means, an intake pump 1 and a multiple solid carbon source add pipe 4.
The vertical cross-section of the exemplary denitrating system according to one embodiment of the present invention is illustrated in Fig. 1, wherein, at least one particulate substrates is filled with in the bed body of horizontal-flow wetland treating pond, described particulate substrates is along water (flow) direction step-by-step arrangement, be followed successively by treatment zone 52, treatment zone 51, second, inhalant region 3, first, exhalant region 7 and catchment area 9, described first treatment zone 51 and described second treatment zone 52 plantation have at least one moisture loving plant 6.
Wherein, the particulate substrates of inhalant region 3 and exhalant region 7 is the gravel of particle diameter 20 ~ 30mm, and the particulate substrates of described first treatment zone 51 and the second treatment zone 52 is the gravel of particle diameter 8 ~ 15mm.Conduit means comprises and extends to the first conduit 2 of described inhalant region 3, the second conduit 8 extending to catchment area 9 from described exhalant region 7 and the 3rd conduit 10 extended from described catchment area 7 from source of sewage.Intake pump 1 is for being delivered to described horizontal-flow wetland treating pond by sewage by described first conduit 2.
Usually, macrophyte (macrophytes) normally moisture loving plant, such as reed (Phragmitesaustralis), cattail (Scirpusspp.), Medulla Junci (Juncusspp.), common cattail (Typhaspp.), profit Radix Glycyrrhizae (Phalarisarundinacea), sweet thatch (Glyceriamaxima), alternanthera philoxeroides (Alternantheraphiloxeroides), Canna generalis Bailey (Cannaspp.), sedge (Carexapp.), hornwort (Ceratophyllumspp.), alpine yarrow (Cladiumjamaicense), wild taro (Colocasiaesculenta), sedge (Cyperusspp.), Rush (Eleocharisspp.), waterweed (Elodeaspp.), , pasture and water (Hydrocloacaroliniensis), flag flower or iris versicolor flower (Irisspp.), duckweed (Lemnaspp.), the fire hose (Ludwigiaspp.), broomcorn millet (Panicumhemitomon), green India grass (Panicumrepens), taro class (Peltandraspp.), nettle (Polygonumspp.), mullet grass (Pontederiaspp.), Herba Rhynchosporae Rubrae (Rhynchosporaspp.), Herba Passiflorae Cupiformis (Sagittariaspp.), lizard tail grass (Saururuscernuus), rhizoma scirpi (Sparaganiumspp.), arrowroot (Thaliageniculata), , wild-rice (Zizaniaaquatica) and southern wild-rice (Zizaniopsismilacea), wherein, cattail, Canna generalis Bailey and reed because of its extensive availability as preferably.
Illustrate in Fig. 2 and overlook face according to the exemplary denitrating system of one embodiment of the present invention, multiple solid carbon source add pipe 4 vertically arrange, evenly distributed in the first treatment zone 51.In addition, refer to shown in Fig. 3, the tube wall that solid carbon source adds pipe 4 is provided with multiple through hole 11.Solid carbon source add to solid carbon source add in pipe 4 be hydrolyzed fermentation to be formed in organic carbon emissions to the first treatment zone 51.Solid carbon source add pipe 4 can preference as pvc pipe.Only allowing micromolecular organic carbon stop the object that resulted in blockage to artificial swamp by through hole of solid carbon source by through hole to reach, in a preferred embodiment, in the through hole that solid carbon source adds pipe 4, being furnished with filtering net (stoping solid carbon source to be discharged); In another preferred embodiment, solid carbon source adds pipe 4 and is built-in with at least one Nylon Bag for holding solid carbon source.In order to make to add pipe arrangement evenly, multiple solid carbon source adds pipe 4 can the arrangement in plum blossom-shaped.
It is perforation pvc pipe higher than Wetland Substrate 5cm that solid carbon source adds pipe 4, bottom lower end to wetland, tube wall through-hole diameter is 5 ~ 10mm, pitch of holes 100 ~ 150mm, pipe diameter is 200 ~ 500mm, tube spacing 0.4 ~ 1.0m, plum blossom lattice-like staggered arrangement, Wetland Substrate structural instability can not be caused, do not affect wetland plant plantation.
Correspondingly, the embodiment of the present invention additionally provides a kind of intensified type artificial swamp method of denitration, by sewage successively by series connection the first horizontal flow artificial wetland processing unit and the second horizontal flow artificial wetland processing unit purify, wherein, introduce solid carbon source in described first horizontal flow artificial wetland processing unit, described solid carbon source is waste straw.
Adopt two horizontal flow artificial wetland unit of series connection mutually to process sewage in the method for denitration of the embodiment of the present invention, introduce solid carbon source in the first horizontal flow artificial wetland processing unit, release organic carbon, improves denitration efficiency; In method of denitration of the present invention, second artificial wetland treatment unit discharges without organic carbon, for decomposing the organic carbon be not fully used and the nitrogen element removing various form further, the secondary pollution after the basis of improving treatment effect being avoided the organic carbon do not utilized completely discharge, environment caused; For saving floor occupying area, the area ratio of the first processing unit and the second processing unit is 2:1.Method of denitration of the present invention is using waste straw as solid carbon source, with low cost, is applicable to the extensive denitrogenation processing of " low-carbon (LC) height nitre nitrogen " waste water.
Method of denitration of the present invention selects waste straw as solid carbon source, and clean after collecting waste straw, be cut into the segment of 2 ~ 3cm after drying, solid carbon source comprises carnation waste straw and rose waste straw.
Above-mentioned waste straw can for the waste straw that gardening plant plants collection in nursery or trade market and come, the speed of the stalk hydrolysed ferment of different plant and the release of color species variant, such as: find through experiment, carnation stalk organic carbon rate of release is fast but the time length is short, and the release of rose stalk organic carbon slowly but the time length long, the color species relative quantity that lily stalk and violet stalk discharge is larger.Preferably, in order to make the quick and durable release of organic carbon and color species burst size is lower, the waste straw of carnation and rose is combined; More preferably, solid carbon source is that carnation waste straw and rose waste straw mix by weight 1:1, refers to following embodiment.
Particularly, can apply above-mentioned denitrating system and carry out sewage denitration process, step comprises:
A) the artificial swamp denitrating system that above-mentioned is provided;
B) conduit means is opened, with suitable (such as 0.84m
3/ d) sewage (in such as sewage, nitre nitrogen content is 50mg/L) introduces artificial swamp denitrating system from the first conduit by flooding quantity continuously;
C) supplement solid carbon source to add in pipe to solid carbon source.
Between stalk, space is comparatively large, and the fermentation gas of generation etc. can be discharged from adding above pipe.
Flooding quantity can be selected according to actual treatment demand, and the residence time is selected according to sewage pollution degree and flooding quantity.
embodiment 1:
Present embodiments provide a kind of intensified type artificial swamp denitrating system, according to the artificial wetland treatment pool building long × wide × height=4.2m × 2m × 0.6m as shown in Figure 1 to Figure 2, the particulate substrates height of filling in the bed body of horizontal-flow wetland treating pond is 50cm.The particulate substrates of inhalant region 3 and exhalant region 7 is the gravel of particle diameter 20 ~ 30mm, and the particulate substrates of described first treatment zone 51 and the second treatment zone 52 is the gravel of particle diameter 8 ~ 15mm.Particulate substrates, along water (flow) direction step-by-step arrangement, is followed successively by treatment zone 52, treatment zone 51, second, inhalant region 2, first, exhalant region 7 and catchment area 9, and described first treatment zone 51 and described second treatment zone 52 plantation have moisture loving plant 6.The length of the first treatment zone 51 is twices of the second treatment zone 52.According to as shown in Figure 3, it is 10 that the present embodiment is provided with the quantity that solid carbon source adds pipe 4, plum blossom lattice-like staggered arrangement, solid carbon source adds pipe 4 for PVC perforated pipe, and top is higher than wetland surface 5cm, and the diameter of tube wall through hole 11 is 8mm, pitch of holes 150mm, pipe diameter is 300mm, tube spacing 0.5m, and each adding in pipe adds solid carbon source 500g.
embodiment 2:
Present embodiments provide a kind of method of denitration, comprise the steps:
A) artificial swamp described in an embodiment 1 denitrating system is provided;
B) conduit means is opened, with 0.84m
3nitre nitrogen content is that the sewage of 50mg/L is introduced artificial swamp denitrating system from the first conduit continuously by the flooding quantity of/d;
C) supplement solid carbon source to add in pipe to solid carbon source.
Wherein, each adding in pipe adds solid carbon source 500g, and solid carbon source is carnation waste straw.
embodiment 3:
Present embodiments provide a kind of method of denitration, comprise the steps:
A) artificial swamp described in an embodiment 1 denitrating system is provided;
B) conduit means is opened, with 0.84m
3nitre nitrogen content is that the sewage of 50mg/L is introduced artificial swamp denitrating system from the first conduit continuously by the flooding quantity of/d;
C) supplement solid carbon source to add in pipe to solid carbon source.
Wherein, each adding in pipe adds solid carbon source 500g, and solid carbon source is rose waste straw.
embodiment 4:
Present embodiments provide a kind of method of denitration, comprise the steps:
A) artificial swamp described in an embodiment 1 denitrating system is provided;
B) conduit means is opened, with 0.84m
3nitre nitrogen content is that the sewage of 50mg/L is introduced artificial swamp denitrating system from the first conduit continuously by the flooding quantity of/d;
C) supplement solid carbon source to add in pipe to solid carbon source.
Wherein, each adding in pipe adds solid carbon source 500g, and solid carbon source is lily waste straw.
embodiment 5:
Present embodiments provide a kind of method of denitration, comprise the steps:
A) artificial swamp described in an embodiment 1 denitrating system is provided;
B) conduit means is opened, with 0.84m
3nitre nitrogen content is that the sewage of 50mg/L is introduced artificial swamp denitrating system from the first conduit continuously by the flooding quantity of/d;
C) supplement solid carbon source to add in pipe to solid carbon source.
Wherein, each adding in pipe adds solid carbon source 500g, and solid carbon source is violet waste straw.
embodiment 6:
Present embodiments provide a kind of method of denitration, comprise the steps:
A) artificial swamp described in an embodiment 1 denitrating system is provided;
B) conduit means is opened, with 0.84m
3nitre nitrogen content is that the sewage of 50mg/L is introduced artificial swamp denitrating system from the first conduit continuously by the flooding quantity of/d;
C) supplement solid carbon source to add in pipe to solid carbon source.
Wherein, each adding in pipe adds solid carbon source 500g, and solid carbon source is carnation waste straw and rose waste straw mass ratio 1:1 Homogeneous phase mixing.
The denitrating system that embodiment 2 to embodiment 6 builds is run 30 days, every 3 days of period water sampling once carry out water quality analysis, result mean value is as shown in table 1.After the denitrating system that embodiment 2 to embodiment 10 builds is run three months, measure matrix pores rate, result shows Wetland Substrate latch up phenomenon does not occur.
Table 1 embodiment 2 to embodiment 6 experimental data table
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. an intensified type artificial swamp denitrating system, is characterized in that, this system comprises:
Horizontal-flow wetland treating pond, at least one particulate substrates is filled with in the bed body of described horizontal-flow wetland treating pond, described particulate substrates is along water (flow) direction step-by-step arrangement, be followed successively by inhalant region, the first treatment zone, the second treatment zone, exhalant region and catchment area, described first treatment zone and described second treatment zone plantation have at least one moisture loving plant;
Multiple evenly distributed and the solid carbon source being vertically arranged at described first treatment zone adds pipe, the tube wall that described solid carbon source adds pipe is provided with multiple through hole;
Conduit means, it comprises and extends to the first conduit of described inhalant region, the second conduit extending to catchment area from described exhalant region and the 3rd conduit extended from described catchment area from source of sewage; And
Intake pump, it is for being delivered to described horizontal-flow wetland treating pond by sewage by described first conduit.
2. artificial swamp denitrating system according to claim 1, is characterized in that, is furnished with filtering net in the through hole that described solid carbon source adds pipe.
3. artificial swamp denitrating system according to claim 1, is characterized in that, described solid carbon source adds pipe and is built-in with at least one Nylon Bag for holding solid carbon source.
4. artificial swamp denitrating system according to claim 1, is characterized in that, multiple solid carbon source adds pipe arrangement in plum blossom-shaped.
5. artificial swamp denitrating system according to claim 1, is characterized in that, the particulate substrates of described inhalant region and exhalant region is the gravel of particle diameter 20 ~ 30mm, and the particulate substrates of described first treatment zone and the second treatment zone is the gravel of particle diameter 8 ~ 15mm.
6. artificial swamp denitrating system according to claim 1, is characterized in that, described moisture loving plant be selected from cattail, Canna generalis Bailey and reed one or more.
7. artificial swamp denitrating system according to claim 1, is characterized in that, it is pvc pipe that solid carbon source adds pipe.
8. an intensified type artificial swamp method of denitration, it is characterized in that, by sewage successively by series connection the first horizontal flow artificial wetland processing unit and the second horizontal flow artificial wetland processing unit purify, wherein, introduce solid carbon source in described first horizontal flow artificial wetland processing unit, described solid carbon source is waste straw.
9. artificial swamp method of denitration according to claim 8, is characterized in that, solid carbon source comprises carnation waste straw and rose waste straw.
10. artificial swamp method of denitration according to claim 9, is characterized in that, described solid carbon source is that carnation waste straw and rose waste straw mix by weight 1:1.
Artificial swamp method of denitration described in 11. any one of according to Claim 8 to 10, is characterized in that, comprise the steps:
A) artificial swamp described in an any one of claim 1 to 7 denitrating system is provided;
B) open conduit means, with suitable flooding quantity, sewage is introduced artificial swamp denitrating system from the first conduit continuously;
C) supplement solid carbon source to add in pipe to solid carbon source.
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| CN114349175A (en) * | 2022-01-17 | 2022-04-15 | 济南大学 | Constructed wetland with high utilization rate of carbon source and method for reducing greenhouse gas emission of constructed wetland |
| CN114409089A (en) * | 2022-01-21 | 2022-04-29 | 北京林业大学 | Subsurface flow constructed wetland river water treatment method based on carbon-supplementing columns |
| CN115259382A (en) * | 2022-07-20 | 2022-11-01 | 江苏中洲检测技术有限公司 | Method for enhancing denitrification and denitrification effects of constructed wetland by using aquatic plants |
| CN116216948A (en) * | 2023-03-23 | 2023-06-06 | 中国水利水电科学研究院 | Device for quickly replacing carbon source in ecological wetland |
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Application publication date: 20160316 |
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