CN203269659U - High-efficiency nitrogen removal three-stage composite constructed wetland - Google Patents

High-efficiency nitrogen removal three-stage composite constructed wetland Download PDF

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Publication number
CN203269659U
CN203269659U CN2013203010858U CN201320301085U CN203269659U CN 203269659 U CN203269659 U CN 203269659U CN 2013203010858 U CN2013203010858 U CN 2013203010858U CN 201320301085 U CN201320301085 U CN 201320301085U CN 203269659 U CN203269659 U CN 203269659U
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China
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wetland
stage
artificial swamp
constructed wetland
pipe
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CN2013203010858U
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Chinese (zh)
Inventor
赵文喜
刘红磊
邵晓龙
陶磊
袁敏
于丹
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天津市环境保护科学研究院
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The utility model discloses a high-efficiency nitrogen removal three-stage composite constructed wetland. The high-efficiency nitrogen removal three-stage composite constructed wetland is characterized in that a stage of water drainage type vertical undercurrent constructed wetland is additionally arranged on the basis of a conventional saturation-type vertical undercurrent plus horizontal undercurrent composite constructed wetland, three stages of constructed wetlands are arranged from high to low in a trapezoid manner, the first stage is a saturated type vertical undercurrent constructed wetland, the second stage is a water drainage type vertical undercurrent constructed wetland, and the third stage is a horizontal undercurrent constructed wetland. When the high-efficiency nitrogen removal three-stage composite constructed wetland operates, firstly pretreated wastewater enters the saturated type vertical undercurrent constructed wetland and is subjected to primary nitrification, then enters the water drainage type vertical undercurrent constructed wetland and is subjected to secondary nitrification, and afterwards, enters the horizontal undercurrent constructed wetland and is subjected to nitrification and denitrification reaction, and finally denitrified yielding water is discharged. Meanwhile, the concentration of total phosphorus in the yielding water is reduced by using multiple approaches such as adsorption and precipitation effects of a wetland filler, microorganism aggregation and wetland plant absorption, so that the purposes of carrying out deep nitrogen and phosphorus removal of the wetland are achieved. The high-efficiency nitrogen removal three-stage composite constructed wetland has the advantages of high-efficiency nitrogen and phosphorus removal, small occupied area, high pollution load rate and the like, and stably operates at low temperature.

Description

Three grades of combined artificial wetlands of a kind of efficient denitrification
Technical field
The utility model relates to the multistage composite artificial swamp that is used for sewage disposal in environment-friendly engineering, particularly a kind of wetland composite structure for treatment of domestic sewage advanced.
Background technology
Along with socioeconomic fast development, China's water environment pollution is day by day serious, and sewage disposal and polluted water environmental improvement have become the great environmental problem that China needs to be resolved hurrily.Due to long-term dirt and the water quality deterioration received, the most surface water environments of China have not had environmental capacity; Be effectively to control water environment pollution, more effectively rural area and town domestic sewage, trade effluent efficiently processed with regard to needs.
For domestic sewage in rural areas by using, because sewage discharge disperses, be difficult to effectively focus on; And China overwhelming majority municipal wastewater treatment plants adopt traditional secondary activated sludge method processing technique, invests highly, and energy consumption is large, and operational management requires high, and advanced nitrogen, dephosphorization are difficult to realization.Artificial marsh sewage treatment system is nearly two, the 30 years a kind of sewage disposal technologies that grow up, compare with traditional sewage secondary biochemical treating process, have the characteristics such as good purification, energy consumption is low, the anti impulsion load ability is strong, ecological environment benefit is remarkable; Adjustable because of its scale, technique is simple, is effective selection that domestic sewage in rural areas by using is administered.
The artificial swamp type can be divided into current wetland and surface-flow, and current wetland can be divided into vertical subsurface flow wetland, horizontal drowned flow artificial wet land again, and other also have the types such as reciprocal current artificial wet land.Different Wetland Types have different water conditioning characteristics because its physical chemistry coenocorrelation is different.As horizontal subsurface flow wetland, because the oxygen that lacks continuous and effective is supplied with, be difficult to ammonia nitrogen is carried out the efficient oxidation (nitrated), but the ideal place that anti-nitration reaction occurs; Vertical subsurface flow wetland is because wetland/atmosphere interface is large, and oxygen is comparatively sufficient, is conducive to nitration reaction and occurs.
Along with the raising that sewage disposal is required, single Wetland Type is difficult to satisfy the effluent quality requirement, is day by day paid attention to by the combined artificial wetland that different wetland type combination become.The most frequently used combined artificial wetland type is horizontal drowned flow-vertical subsurface flow, these two kinds of forms of vertical subsurface flow-horizontal drowned flow, by Wetland Area distribute, the difference of reflux ratio, can design the not matter treatment effect that reaches different.Literature survey is found, although traditional composite type artificial wetland has been considered the relative merits of different wetlands, for the removal of ammonia nitrogen and total nitrogen, still is difficult to the effect that reaches desirable.
The utility model content
for above-mentioned prior art, the utility model provides a kind of efficient denitrification three grades of combined artificial wetlands, the drain type vertical subsurface flow wetland is incorporated in tradition (saturation type) vertical subsurface flow-horizontal drowned flow combined artificial wetland, form three grades of combined artificial wetlands, thereby form the coincidence wet land treating system of saturation type vertical subsurface flow-drainage type type vertical subsurface flow-horizontal drowned flow, can be economical, effectively remove the nitrogen in sewage, the pollutents such as phosphorus, both broken through single type wet land technique shortcoming, improved again the low difficult problem of conventional composite wet land technique nitric efficiency, improve land area pollutant load rate, save the wetland construction land.
In order to solve the problems of the technologies described above, the technical scheme that three grades of combined artificial wetlands of the utility model efficient denitrification are achieved is: these three grades of combined artificial wetlands comprise from height and low first step artificial swamp, the second artificial swamp and third party's work wetland according to trapezoidal layout, first step artificial swamp is the saturation type vertical subsurface flow wetland, second stage artificial swamp is the drain type vertical subsurface flow wetland, and third stage artificial swamp is horizontal drowned flow artificial wet land; The top of described first step artificial swamp is provided with the wetland water-in, the bottom of described first step artificial swamp is provided with blow-down pipe, the end of described first step artificial swamp sets out the pond, and described outlet sump is provided with and overflows water pipe, and the described water pipe that overflows is connected to second stage artificial swamp; The bottom of second stage artificial swamp is provided with the rising pipe that leads to third stage artificial swamp, is connected with return line between described rising pipe and described wetland water-in, and the end of described third stage artificial swamp is provided with the water level adjustable water flowing out structure; Being equipped with by particle diameter in first step artificial swamp and third stage artificial swamp is the rubble of 15~50mm or the filler that cobble consists of, and the filler that the coarse sand that to be provided with by particle diameter in the artificial swamp of the second stage be 1~5mm consists of is all planted wetland plant on described filler.
Three grades of combined artificial wetlands of the utility model efficient denitrification; wherein; perisporium and the bottom surface of every grade of wetland of every grade of artificial swamp of described first step artificial swamp, second stage artificial swamp and third stage artificial swamp all are equipped with impervious barrier; the impervious barrier that its perisporium is laid is the geomembrane anti-seepage layer of two cloth one films, and the impervious barrier that lay its bottom is comprised of anti seepage membrane and the coarse sand protective layer that is positioned at the anti seepage membrane upper and lower.
Described wetland plant is one or more in reed, cattail, Canna generalis Bailey.
Distance between described blow-down pipe and bottom surface is 200mm, and the mouth of pipe of described blow-down pipe is connected to discharge conduit, and the mouth of pipe place of described blow-down pipe is provided with valve.
Compared with prior art, the beneficial effects of the utility model are:
Three grades of combined artificial wetlands of the utility model efficient denitrification are to have added one-level drain type vertical subsurface flow wetland on the compound wetland basis of traditional saturation type vertical subsurface flow+horizontal drowned flow, thereby reinforcement is nitrated to ammonia nitrogen in sewage, and the denitrification process of horizontal subsurface flow wetland, improve nitric efficiency.During the wetland operation, at first entering the saturation type vertical subsurface flow wetland through pretreated sewage carries out elementary nitrated, then enter the drain type vertical subsurface flow wetland and carry out secondary nitratedly, enter afterwards horizontal subsurface flow wetland and carry out nitrated/anti-nitration reaction, at last the denitrogenation water outlet is discharged.Coarse sand filler in the drain type vertical subsurface flow wetland can increase the hydraulic detention time in this unit, and improves the ammonia nitrogen oxidation effectiveness.Simultaneously, utilize absorption and the number of ways such as precipitating action, germs collect and wetland plant absorption of wet land filler, the total phosphorus concentration in water outlet is decreased, realize the purpose of wetland advanced nitrogen dephosphorization.The technique that adopts the utility model to realize has high-efficient denitrification and dephosphorization, winter low temperature steady running, floor space is few and pollution load rate advantages of higher.
Adopt three grades of combined artificial wetlands of the utility model to realize the denitrogenation dephosphorizing processing, to access the wetland water-in with sewage disposal plant effluent or through pretreated high-ammonia-nitrogen sewage by pipeline, absorption and precipitating action and wetland plant growth and microbial film cultivation through the wet land fillers of 2~3 months, can effectively remove the pollutents such as nitrogen phosphorus in sewage, monitoring result shows can be to TN(total nitrogen in water body) clearance can reach 60~80%, TP(total phosphorus) clearance maintains 50~70%.In a word, the utility model can be removed the pollutents such as nitrogen in sewage, phosphorus economical, effectively, has both broken through single type wet land technique shortcoming, has improved again the low difficult problem of conventional composite wet land technique nitric efficiency, improve land area pollutant load rate, save the wetland construction land.
Description of drawings
Accompanying drawing is the structural representation of three grades of combined artificial wetlands of the utility model efficient denitrification.
In figure:
1-wetland water-in, 2-saturation type vertical subsurface flow wetland, 21-blow-down pipe, 22-outlet sump, the water outlet of 3-saturation type vertical subsurface flow wetland, 4-drain type vertical subsurface flow wetland, the water outlet of 5-drain type vertical subsurface flow wetland, 6-horizontal subsurface flow wetland, the 7-wetland effluent, 8-reflux line, 9-wetland plant.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.
As shown in the figure; three grades of combined artificial wetlands of a kind of efficient denitrification of the utility model; comprise from height and low first step artificial swamp, the second artificial swamp and third party's work wetland according to trapezoidal layout; the perisporium of every grade of wetland of every grade of artificial swamp and bottom surface all are equipped with impervious barrier; the impervious barrier that its perisporium is laid is the geomembrane anti-seepage layer of two cloth one films, and the impervious barrier that lay its bottom is comprised of anti seepage membrane and the coarse sand protective layer that is positioned at the anti seepage membrane upper and lower.First step artificial swamp is saturation type vertical subsurface flow wetland 2, and second stage artificial swamp is drain type vertical subsurface flow wetland 4, and third stage artificial swamp is horizontal drowned flow artificial wet land 6; The top of described first step artificial swamp is provided with wetland water-in 1, the bottom of described first step artificial swamp is provided with blow-down pipe 21, distance between described blow-down pipe 21 and bottom surface is 200mm, the mouth of pipe of described blow-down pipe 21 is connected to discharge conduit, the mouth of pipe place of described blow-down pipe 21 is provided with valve, opens valve during wetland emptying and enters discharge conduit by blow-down pipe 21.the end of described first step artificial swamp sets out pond 22, described outlet sump is provided with and overflows water pipe 3, the described water pipe 3 that overflows is connected to second stage artificial swamp 4, the bottom that the water outlet overflow enters drainage type type vertical subsurface flow wetland 4 second stage artificial swamps 4 of the second stage is provided with the rising pipe 5 that leads to third stage artificial swamp 6, the water outlet of the drainage type type vertical subsurface flow wetland 4 of the second stage is discharged by gravity and is entered the horizontal subsurface flow wetland 6 of the third stage, be connected with return line 8 between described rising pipe 5 and described wetland water-in 1, different according to the water yield, the water outlet of the drainage type type vertical subsurface flow wetland 4 of the second stage can also be back to the saturation type vertical subsurface flow wetland 2 of the first step by return line 8 with the different water yields in the horizontal subsurface flow wetland 6 that enters the third stage, the end of described third stage artificial swamp 6 is provided with water level adjustable water flowing out structure 7, and the water level of draining is adjustable can be realized by the vertical tube length of adjusting outlet elbow.
Contain the sewage of ammonia nitrogen after pre-treatment removal suspended substance wherein, at first enter the saturation type vertical current constructed wetland 2 of the first step by wetland water-in 1, the water outlet of the first step is through the drain type vertical current constructed wetland 4 that water pipe 3 enters into the second stage that overflows of outlet sump 22, the water outlet of the second stage enters the horizontal drowned flow artificial wet land 6 of the third stage through rising pipe 5, discharge finally by outlet elbow.
All lay filler in every grade of artificial swamp, for preventing stopping up, the filler in first step artificial swamp and third stage artificial swamp is advisable with rubble or cobble, and its particle diameter is 15~50mm; In order to improve nitrification effect, the filler in the artificial swamp of the second stage is advisable with coarse sand, and its particle diameter is 1~5mm; All plant wetland plant 9 on described filler, described wetland plant 9 is one or more in reed, cattail, Canna generalis Bailey.
Although traditional composite type artificial wetland has been considered the relative merits of different wetlands, for the removal of ammonia nitrogen and total nitrogen, still be difficult to the effect that reaches desirable.Three grades of combined artificial wetlands of the utility model, before sewage enters horizontal drowned flow, utilize the two stage vertical current wetland to carry out the degree of depth to the ammonia-state nitrogen in sewage nitrated, thereby better bring into play the anti-nitration reaction of horizontal subsurface flow wetland, finally reach more effective nitrogen and remove.Its principle of work is described as follows:
Vertical subsurface flow wetland is because wetland/atmosphere interface is large, and oxygen is comparatively sufficient, is conducive to nitration reaction and occurs; During through saturation type vertical subsurface flow wetland 2, ammonia-state nitrogen in sewage has obtained preliminary nitrated, because drain type vertical subsurface flow wetland 4 has reoxygenation effect preferably, therefore, during through drain type vertical subsurface flow wetland 4, the ammonia-state nitrogen in sewage has obtained further nitrated.And horizontal subsurface flow wetland 6 is supplied with due to the oxygen that lacks continuous and effective, it is the ideal place that anti-nitration reaction occurs, thereby can carry out effective denitrification to the water outlet of the drainage type type vertical subsurface flow wetland 4 of previous stage, anti-nitration reaction be the effective way that in sewage, nitrogen removes, because three grades of its anti-nitration reactions of combined artificial wetland of the utility model are more abundant, therefore can more effectively remove the nitrogen in sewage, thereby reach the purpose of efficient denitrification.
Embodiment:
Adopt the rectangular parallelepiped pond body of brick mix structure, wherein, the length and width of the pond body of the saturation type vertical subsurface flow wetland 2 of the first step are of a size of 1.2m * 2.5m, and area is 3.0m 2, the pond is 1.1m deeply, and filler wherein is the rubble of particle diameter 20-40mm, and depth of cracking closure is 1.0m, voidage 45%; The pond body length and width of the drain type vertical subsurface flow wetland 4 of the second stage are of a size of 1.2m * 1.3m, and area is 1.5m 2, the pond is 0.8m deeply, and filler wherein is the coarse sand of particle diameter 1-4mm, and depth of cracking closure is 0.7m, voidage 35%; The length and width of the horizontal drowned flow artificial wet land of the third stage are of a size of 1.5m * 4.0m, and area is 6.0m 2, the pond is 0.8m deeply, and filler wherein is the rubble of particle diameter 20-40mm, and depth of cracking closure is 0.7m, voidage 45%.All all lay two cloth one film geomembrane anti-seepage layer at wetland pond body perisporium in above-mentioned three grades of wetland ponds, all plant the wetland plant reed on filler, the density of plantation is about 15/m 2
In development area, Tianjin view river access wetland, after cultivating through the wetland plant growths of 3 months, domestication and microbial film, carry out sewage disposal.Through many steady running half a year, by the Inlet and outlet water of these three grades of combined artificial wetlands is monitored: influent quality is about NH 4-N29.2mg/L, NO 3-N0.5mg/L, TP4.7mg/L; Effluent quality is about NH 4-N6.4mg/L, NO 3-N3.0mg/L, TP1.7mg/L; Monitoring result shows that three grades of combined artificial wetlands of the utility model are that 65%, TP clearance maintains 64% to TN clearance in water body.
Although the above is described the utility model in conjunction with figure; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; in the situation that do not break away from the utility model aim, can also make a lot of distortion, within these all belong to protection of the present utility model.

Claims (4)

1. three grades of combined artificial wetlands of an efficient denitrification, comprise from height and low first step artificial swamp, the second artificial swamp and third party's work wetland according to trapezoidal layout, it is characterized in that, first step artificial swamp is saturation type vertical subsurface flow wetland (2), second stage artificial swamp is drain type vertical subsurface flow wetland (4), and third stage artificial swamp is horizontal drowned flow artificial wet land (6); The top of described first step artificial swamp is provided with wetland water-in (1), the bottom of described first step artificial swamp is provided with blow-down pipe (21), the end of described first step artificial swamp sets out pond (22), described outlet sump is provided with and overflows water pipe (3), and the described water pipe (3) that overflows is connected to second stage artificial swamp (4); The bottom of second stage artificial swamp (4) is provided with the rising pipe (5) that leads to third stage artificial swamp (6), be connected with return line (8) between described rising pipe (5) and described wetland water-in (1), the end of described third stage artificial swamp (6) is provided with water level adjustable water flowing out structure (7); Being equipped with by particle diameter in first step artificial swamp and third stage artificial swamp is the rubble of 15~50mm or the filler that cobble consists of, the filler that the coarse sand that to be provided with by particle diameter in second stage artificial swamp (4) be 1~5mm consists of is all planted wetland plant (9) on described filler.
2. three grades of combined artificial wetlands of efficient denitrification according to claim 1; it is characterized in that; perisporium and the bottom surface of every grade of wetland of every grade of artificial swamp of described first step artificial swamp, second stage artificial swamp and third stage artificial swamp all are equipped with impervious barrier; the impervious barrier that its perisporium is laid is the geomembrane anti-seepage layer of two cloth one films, and the impervious barrier that lay its bottom is comprised of anti seepage membrane and the coarse sand protective layer that is positioned at the anti seepage membrane upper and lower.
3. three grades of combined artificial wetlands of efficient denitrification according to claim 1, is characterized in that, described wetland plant (9) is one or more in reed, cattail, Canna generalis Bailey.
4. three grades of combined artificial wetlands of efficient denitrification according to claim 1, it is characterized in that, distance between described blow-down pipe (21) and bottom surface is 200mm, and the mouth of pipe of described blow-down pipe (21) is connected to discharge conduit, and the mouth of pipe place of described blow-down pipe (21) is provided with valve.
CN2013203010858U 2013-05-28 2013-05-28 High-efficiency nitrogen removal three-stage composite constructed wetland CN203269659U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104211182A (en) * 2014-08-29 2014-12-17 暨南大学 Backflow vertical wetland sewage treatment process and device, and application of process and device
CN104478085A (en) * 2014-11-19 2015-04-01 沈阳建筑大学 Anti-seepage treatment method for constructed wetland structure
FR3013347A1 (en) * 2013-11-21 2015-05-22 Recycl Eau Method and station for managing effluents from agronomic activities by hybrid phytoepuration treatment.
CN104787897A (en) * 2015-04-27 2015-07-22 河海大学 Purification method of drained water of farmlands directly adjacent to rivers through shore wetlands
CN105293841A (en) * 2015-12-01 2016-02-03 中国科学院亚热带农业生态研究所 Constructed wetland and infiltration system-combined rural sewage deep processing method and apparatus
CN105923790A (en) * 2016-06-16 2016-09-07 中国矿业大学 Composite horizontal subsurface flow combined artificial wetland system and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3013347A1 (en) * 2013-11-21 2015-05-22 Recycl Eau Method and station for managing effluents from agronomic activities by hybrid phytoepuration treatment.
CN104211182A (en) * 2014-08-29 2014-12-17 暨南大学 Backflow vertical wetland sewage treatment process and device, and application of process and device
CN104211182B (en) * 2014-08-29 2016-09-07 暨南大学 Reflux vertical wet land sewage treating process and device and application
CN104478085A (en) * 2014-11-19 2015-04-01 沈阳建筑大学 Anti-seepage treatment method for constructed wetland structure
CN104787897A (en) * 2015-04-27 2015-07-22 河海大学 Purification method of drained water of farmlands directly adjacent to rivers through shore wetlands
CN105293841A (en) * 2015-12-01 2016-02-03 中国科学院亚热带农业生态研究所 Constructed wetland and infiltration system-combined rural sewage deep processing method and apparatus
CN105293841B (en) * 2015-12-01 2018-02-02 中国科学院亚热带农业生态研究所 A kind of artificial swamp and filtration system combined depth handles country sewage method and device
CN105923790A (en) * 2016-06-16 2016-09-07 中国矿业大学 Composite horizontal subsurface flow combined artificial wetland system and method

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Granted publication date: 20131106

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