CN101898856B - Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof - Google Patents
Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof Download PDFInfo
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- CN101898856B CN101898856B CN2010102480490A CN201010248049A CN101898856B CN 101898856 B CN101898856 B CN 101898856B CN 2010102480490 A CN2010102480490 A CN 2010102480490A CN 201010248049 A CN201010248049 A CN 201010248049A CN 101898856 B CN101898856 B CN 101898856B
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- subsurface flow
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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
Abstract
The invention discloses a subsurface flow constructed wetland system of secondary effluent from a sewage treatment plant and an application thereof, and the subsurface flow constructed wetland system comprises a subsurface flow constructed wetland device, water passing tracery walls are respectively arranged on the water inlet side and the outer outlet side of the subsurface flow constructed wetland device, the water passing tracery walls are provided with water seepage holes, a wetland matrix and wetland plants are arranged between the water passing tracery walls on the two sides, and a bottom artificial aeration device is arranged at the bottom part of the subsurface flow constructed wetland device; a pre-aeration device is arranged outside the water passing tracery wall on the water inlet side, and a water collection device is arranged outside the water passing tracery wall on the water outlet side; and a high-level water tank is arranged on the water inlet side, the horizontal position of the high-level water tank is higher than the pre-aeration device and the subsurface flow constructed wetland device, and the high-level water tank is communicated with the pre-aeration device through a water inlet pipe. The subsurface flow constructed wetland system has the advantages of simple structure, low energy consumption, low cost, high nitrogen and phosphorus removal efficiency, small occupied area, convenient operation management, convenient sampling and the like. The subsurface flow constructed wetland system is particularly applicable to treatment of the secondary effluent of the urban sewage treatment plants and applicable to the treatment of other micro-polluted water.
Description
Technical field
The present invention relates to a kind of water technology, relate in particular to a kind of subsurface flow constructed wetland system and application thereof of secondary effluent from sewage treatment plant.
Background technology
Though the urban wastewater treatment firm second-stage treatment is cut down all kinds of pollution substances in the sewage to a great extent to some extent, the relative concentration of pollutent such as N, P is still very high in the water outlet, and C/N is lower.After these pollutents are accompanied by sewage effluents entering receiving water body, be easy to cause the eutrophication of receiving water body.
In the prior art, urban wastewater treatment firm advanced treatment process, widely used membrane bioreactor (MBR) technology, BAF (BAF) technology and the cyclic activated sludge system etc. of mainly containing; Exist technology to fall behind; Shortcomings such as initial cost is big, and running cost is high, and the water quality after the processing is undesirable.Membrane bioreactor (MBR) technology, system's oxygen requirement is big, energy consumption is high, and the accumulation of recalcitrant substance causes the murder by poisoning of mikrobe and the pollution of film easily, and the membrane module price is relatively more expensive at present; BAF (BAF) technology, system's toggle speed is slow, causes biofilm detachment in the backwash process easily, and operational management is complicated; Cyclic activated sludge system, though technical process is simple, biological denitrification dephosphorization efficiency by using is difficult to improve, and mode is comparatively single.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, less energy-consumption, low cost, denitrogenation dephosphorizing efficient is high, floor space is little, operational management is convenient, the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant easily of taking a sample.
The objective of the invention is to realize through following technical scheme:
The subsurface flow constructed wetland system of secondary effluent from sewage treatment plant of the present invention; Comprise the drowned flow artificial wet land device; The influent side of said drowned flow artificial wet land device and water outlet side were respectively equipped with the spray wall; The said spray wall of crossing is provided with the infiltration hole, and crossing between the spray wall of both sides is provided with wetland matrix and wetland plant, and the bottom of said drowned flow artificial wet land device is provided with bottom artificial aeration's device;
The spray wall outside of crossing of said influent side is provided with preaerator, and the spray wall outside of crossing of water outlet side is provided with captation;
Said influent side is provided with elevated tank, and the level attitude of said elevated tank is higher than said preaerator and drowned flow artificial wet land device, and said elevated tank is communicated with said preaerator through water inlet pipe.
The application of the subsurface flow constructed wetland system of above-mentioned secondary effluent from sewage treatment plant of the present invention, this method is used for the north of china in winter WWT, adopts preaeration and wetland bottom intermittent aeration to realize denitrogenation dephosphorizing.
Technical scheme by the invention described above provides can be found out; The subsurface flow constructed wetland system of secondary effluent from sewage treatment plant of the present invention and application thereof; Because it has adopted preaeration and artificial aeration's device; It is to said sewage treatment effect, and particularly the north of china in winter obvious processing effect improves, and has avoided the unconspicuous shortcoming of treatment effect in winter that occurs in traditional artificial swamp; Secondly, because its simple in structure and integral type design, so its operational management is convenient and floor space is little, has avoided the bigger shortcoming of traditional artificial swamp floor space.Treatment effect is good in a long time, so its contaminant removal efficiency is high, and can alleviate the wetland blockage problem to a certain extent.Be particularly suitable for the processing of urban wastewater treatment firm secondary effluent, also be fit to the processing of other micro-polluted waters.
Description of drawings
Fig. 1 is the structural representation of subsurface flow constructed wetland system of the present invention;
Fig. 2 is the vertical view of Fig. 1.
Embodiment
The subsurface flow constructed wetland system of secondary effluent from sewage treatment plant of the present invention, the embodiment that it is preferable such as Fig. 1, shown in Figure 2:
Comprise the drowned flow artificial wet land device; The influent side of said drowned flow artificial wet land device and water outlet side were respectively equipped with the spray wall; The said spray wall of crossing is provided with the infiltration hole; Crossing between the spray wall of both sides is provided with wetland matrix and wetland plant, and the bottom of said drowned flow artificial wet land device is provided with bottom artificial aeration's device;
The spray wall outside of crossing of said influent side is provided with preaerator, and the spray wall outside of crossing of water outlet side is provided with captation;
Said influent side is provided with elevated tank, and the level attitude of said elevated tank is higher than said preaerator and drowned flow artificial wet land device, and said elevated tank is communicated with said preaerator through water inlet pipe.
Described preaerator is a body structure, is provided with aeration tube in bottom of device, and said aeration tube is connected with aerator, and the volume ratio of said preaerator and drowned flow artificial wet land device is 1/12-1/8.
Said spray wall excessively is the entity structure that is filled with the gravel weighting material between two perforation plates.
Said bottom artificial aeration's device comprises one group of parallel interval aeration tube, and said aeration tube is connected with aerator.
The lower floor of said wetland matrix is the gravel bed of 3-8cm particle diameter; The middle layer is the filtrate matrix of 1-5mm particle diameter, comprises in volcanics, Wingdale, flyash, the zeolite one or more; The superiors are native clay.
Said wetland plant comprises one or more in reed, cattail, Canna generalis Bailey, the wilson iris.
Said wetland plant planting density be 15-20 strain/m
2
Said captation comprises header tank, and said header tank is provided with a plurality of sample cocks at different heights, and the volume ratio of said captation and drowned flow artificial wet land device is 1/12-1/10.
The application of the subsurface flow constructed wetland system of above-mentioned secondary effluent from sewage treatment plant of the present invention, this method is used for the north of china in winter WWT, adopts preaeration and wetland bottom intermittent aeration to realize denitrogenation dephosphorizing.
The influent load of system is 0.6-1.2m
3/ (m
2D).
The present invention also can be used for other area and the WWT in season.
Subsurface flow constructed wetland system of the present invention, sewage passes through drowned flow artificial wet land again through after the preaeration, can get the clear water that reaches " water environment quality standard (GB3838-2002) " III class standard.Simple in structure, less energy-consumption, low cost, denitrogenation dephosphorizing efficient is high, floor space is little, operational management is convenient, sampling is convenient, is mainly used in processing urban wastewater treatment firm secondary effluent.
Specific embodiment:
Like Fig. 1, shown in Figure 2, subsurface flow constructed wetland system of the present invention is to let sewage through after the preaeration, passes through drowned flow artificial wet land again, is 0.6-1.2m at influent load
3/ (m
2D) in the scope, must reach the clear water of " water environment quality standard (GB3838-2002) " III class standard.
Preaerator of the present invention is a body structure, is provided with an aeration tube that connects aerator in the bottom of casing, is equipped with the identical aperture of diameter on the aeration tube equably.The volume ratio of preaerator and drowned flow artificial wet land device is 1/12-1/8, round tube inside diameter 8-12mm, and small aperture is 2-4mm on the pipe.As required, aerator can be selected the model that is fit to.
Current wetland device of the present invention and preaerator are integral structure, and are filled with the various filtrate matrix of different-grain diameter, different thickness in wetland inside, like gravel, volcanics, Wingdale, flyash, zeolite and clay etc.The bottom is a gravel bed, and the superiors are clay seam.
Among the present invention, the matrix particle diameter is 0.2-8cm.It is 3-8cm that lower floor's gravel bed is filled with particle diameter; As required, the middle layer is filled with the filtrate matrix that particle diameter is 1-5mm, comprises volcanics, Wingdale, flyash, zeolite etc., and mixes as the case may be and fill or positive and negative particle diameter is filled out the shop; Native clay is filled by the superiors.
Among the present invention, the wetland plant of suitable northern areas such as reed, cattail, Canna generalis Bailey, wilson iris is applied in this wetland.The plant of wetland plantation adopts the dense planting mode to improve treatment effect, and the planting density of several plant is 15-20 strain/m2.As required, also can select other planting density.
Among the present invention, be provided with water and filtrate thief hole in the side of wetland casing,, analyze its treatment effect respectively in different filtrates flow area and filter bed degree of depth sampling.Water intaking aperture, hole is 8-12mm, and is connected with oval pipe, is equipped with the aperture that diameter is 2-4mm on the pipe.Filtrate thief hole aperture is 40-60mm.
Among the present invention, be provided with artificial aeration's device, its role is to the wetland oxygenation and be used for the wetland device insulation in the winter time in the body structure bottom.As required, at bottom half one cover aerating system is set, concrete parameter and preaerator are basic identical in its aerating apparatus.
Among the present invention, be provided with captation, and, the sample cock under the different water level conditions be set according to the wetland degree of depth in wetland effluent mouth position.The volume ratio of captation and drowned flow artificial wet land device is 1/12-1/10.
The preferable embodiment of this invention is that the urban wastewater treatment firm secondary effluent flows into the preaeration system and device certainly through elevated tank; Preaeration through certain hour; Get into the drowned flow artificial wet land device then, the adsorption of process matrix in wetland, physics, the chemical action of a series of complicacies such as microbial process on matrix and root system of plant surface; Can remove the principal pollutant in the said sewage effectively; Wherein, obvious to the removal effect of total nitrogen and total phosphorus, particularly at higher hydraulic load 0.6-1.2m
3/ (m
2D) time, still good to wastewater treatment efficiency.
The operation treatment effect of north of china in winter wetland is the emphasis of artificial swamp research always; This invention is provided with aeration tube in the bottom of wetland; Can guarantee dissolved oxygen concentration certain in the wetland, can play certain insulation effect through the aeration in winter again, improve the pollutant removal in the water outlet.This invention has taken into full account the position and the mode of required sampling, and has carried out optimization design, makes sampling spot accurate and convenient.This invention has realized the preferred process effect to principal pollutant such as ammonia nitrogen, total nitrogen, total phosphorus, COD in the urban wastewater treatment firm secondary effluent.
The present invention has the following advantages and positive effect:
(1) make full use of the artificial swamp preaerator, improve the dissolved oxygen in will disposing of sewage, for drowned flow artificial wet land provides preferable pollutant removal habitat, thereby improve the denitrogenation dephosphorizing effect of wetland greatly.
(2) through the artificial aeration system of wetland bottom, make the northerly winter operation of artificial swamp aspect obtain certain breakthrough, make artificial swamp still can reach preferable effect to the removal of principal pollutant in the winter time.
(3) the integral structure design has been adopted in this invention, has dwindled floor space, thereby has practiced thrift cost.
(4) operational management is convenient, and the personnel that need not safeguard.
Concrete experimental example:
With certain urban wastewater treatment firm secondary effluent of the north is former water, COD in the former water
Cr58.9～79.6mg/l NH
3-N 1.2～6.8mg/l, TN 3.2～12.5mg/l, TP1.3～5.7mg/l handles through the present invention, and hydraulic load is 0.8m
3/ (m
2D) time, water outlet COD
CrLess than 20mg/l, NH
3-N is less than 1.0mg/l, and TN is less than 1.0mg/l, and TP is less than 0.2mg/l.Through long-play (more than six months), stable effluent quality.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (8)
1. the subsurface flow constructed wetland system of a secondary effluent from sewage treatment plant; It is characterized in that; Comprise the drowned flow artificial wet land device, the influent side of said drowned flow artificial wet land device and water outlet side were respectively equipped with the spray wall, and the said spray wall of crossing is provided with the infiltration hole; Crossing between the spray wall of both sides is provided with wetland matrix and wetland plant, and the bottom of said drowned flow artificial wet land device is provided with bottom artificial aeration's device;
The spray wall outside of crossing of said influent side is provided with preaerator, and the spray wall outside of crossing of water outlet side is provided with captation;
Said influent side is provided with elevated tank, and the level attitude of said elevated tank is higher than said preaerator and drowned flow artificial wet land device, and said elevated tank is communicated with said preaerator through water inlet pipe;
Said spray wall excessively is the entity structure that is filled with the gravel weighting material between two perforation plates;
The lower floor of said wetland matrix is the gravel bed of 3-8cm particle diameter; The middle layer is the filtrate matrix of 1-5mm particle diameter, comprises in volcanics, Wingdale, flyash, the zeolite one or more; The superiors are native clay.
2. the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 1; It is characterized in that; Described preaerator is a body structure; Be provided with aeration tube in bottom of device, said aeration tube is connected with aerator, and the volume ratio of said preaerator and drowned flow artificial wet land device is 1/12-1/8.
3. the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 1 is characterized in that, said bottom artificial aeration's device comprises one group of parallel interval aeration tube, and said aeration tube is connected with aerator.
4. the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 1 is characterized in that, said wetland plant comprises one or more in reed, cattail, Canna generalis Bailey, the wilson iris.
5. the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 4 is characterized in that, the planting density of said wetland plant is 15-20 strain/m
2
6. the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 1; It is characterized in that; Said captation comprises header tank; Said header tank is provided with a plurality of sample cocks at different heights, and the volume ratio of said captation and drowned flow artificial wet land device is 1/12-1/10.
7. the application of the subsurface flow constructed wetland system of each described secondary effluent from sewage treatment plant of claim 1 to 6 is characterized in that, this method is used for the north of china in winter WWT, adopts preaeration and wetland bottom intermittent aeration to realize denitrogenation dephosphorizing.
8. the application of the subsurface flow constructed wetland system of secondary effluent from sewage treatment plant according to claim 7 is characterized in that, the influent load of system is 0.6-1.2m
3/ (m
2D).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102480490A CN101898856B (en) | 2010-08-06 | 2010-08-06 | Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof |
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| CN2010102480490A CN101898856B (en) | 2010-08-06 | 2010-08-06 | Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof |
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| CN101898856B true CN101898856B (en) | 2012-07-04 |
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Application publication date: 20101201 Assignee: Zhonghuan Liaoning Engineering Technology Co.,Ltd. Assignor: China University of Mining & Technology, Beijing Contract record no.: 2014210000068 Denomination of invention: Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof Granted publication date: 20120704 License type: Common License Record date: 20140812 |
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