CN111003809A - Fe-C enhanced constructed wetland denitrification system and denitrification method - Google Patents
Fe-C enhanced constructed wetland denitrification system and denitrification method Download PDFInfo
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- CN111003809A CN111003809A CN201911301822.2A CN201911301822A CN111003809A CN 111003809 A CN111003809 A CN 111003809A CN 201911301822 A CN201911301822 A CN 201911301822A CN 111003809 A CN111003809 A CN 111003809A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Abstract
An Fe-C reinforced constructed wetland denitrification system and a denitrification method relate to a constructed wetland denitrification system and a denitrification method. The invention aims to solve the technical problem of low efficiency of the existing nitrogen pollutant purification treatment. The Fe-C enhanced constructed wetland denitrification system comprises a reservoir, a water inlet peristaltic pump, wetland plants, a first iron ore matrix vertical flow constructed wetland, a second iron ore matrix vertical flow constructed wetland, a slow-release carbon source matrix horizontal flow constructed wetland and a water outlet pipe, wherein the denitrification system is arranged in sequence according to the reservoir, the water inlet peristaltic pump, the first iron ore matrix vertical flow constructed wetland, the second iron ore matrix vertical flow constructed wetland, the slow-release carbon source matrix horizontal flow constructed wetland and the water outlet pipe. The Fe-C enhanced constructed wetland denitrification system has the nitrogen removal rate of over 90 percent. The invention belongs to the technical field of agricultural wastewater purification.
Description
Technical Field
The invention relates to a constructed wetland denitrification system and a denitrification method.
Background
The problem of environmental pollution caused by farmland nitrogen loss is becoming serious day by day, and the method poses serious threat to the sustainable development of modern agriculture and social economy. Northeast is used as an important grain core production area and the largest commercial grain production base in China. The application of excessive nitrogen fertilizer causes the pollutants of nitrogen (such as ammonia nitrogen and nitrate nitrogen) and the like in farmland effluent to enter the peripheral receiving water body, thereby bringing serious hidden danger of eutrophication. The drainage ditch can play the pollutant purification effect to a certain extent, but has the problem that treatment effeciency is low. Therefore, the development of a novel reinforced artificial wetland ecological treatment technology has important practical significance.
Disclosure of Invention
The invention aims to solve the technical problem of low efficiency of the existing nitrogen pollutant purification treatment, and provides a Fe-C enhanced constructed wetland denitrification system and a denitrification method.
The Fe-C reinforced constructed wetland denitrification system comprises a reservoir, a water inlet peristaltic pump, wetland plants, a first iron ore matrix vertical flow constructed wetland, a second iron ore matrix vertical flow constructed wetland, a carbon source slow-release matrix horizontal flow constructed wetland and a water outlet pipe, wherein the denitrification system comprises the reservoir, the water inlet peristaltic pump, the first iron ore matrix vertical flow constructed wetland, the second iron ore matrix vertical flow constructed wetland, the carbon source slow-release matrix horizontal flow constructed wetland and the water outlet pipe which are sequentially arranged, the lower end of the first iron ore matrix vertical flow constructed wetland is provided with a first iron ore matrix vertical flow constructed wetland water outlet, the lower end of the second iron ore matrix vertical flow constructed wetland is provided with a second iron ore matrix vertical flow constructed wetland water outlet, the water outlet pipe is positioned at the lower end of the carbon source slow-release matrix horizontal flow constructed wetland, the first iron ore matrix vertical flow constructed wetland and the second iron ore matrix vertical flow constructed wetland, The filled substrates are iron ores, wetland plants are planted on the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland, and the substrates filled in the slow-release carbon source substrate horizontal flow artificial wetland are carbon source materials.
The filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4-8 cm.
The carbon source material is one or a combination of more of wood, rice straw, corn cob and litter.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1-5 cm.
The wetland plant is one or any combination of loosestrife, canna, cattail and calamus.
The planting density of the wetland plants is 0.025 plants/cm2。
The inner diameter of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 10cm, and the height of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 40 cm.
The length, width and height of the slow-release carbon source substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 cm.
The denitrification method adopting the Fe-C reinforced artificial wetland denitrification system comprises the following steps:
pumping wastewater from a reservoir through a water inlet peristaltic pump, firstly entering a first iron ore matrix vertical flow artificial wetland from the top of the first iron ore matrix vertical flow artificial wetland, then entering a second iron ore matrix vertical flow artificial wetland from the top of the second iron ore matrix vertical flow artificial wetland, then entering a slow-release carbon source matrix horizontal flow artificial wetland from the water outlet of the second iron ore matrix vertical flow artificial wetland, and then exiting water from a water outlet pipe, wherein the hydraulic retention time is 0.5-2 days.
The invention has the following advantages:
1. according to the Fe-C enhanced constructed wetland denitrification system, the electron transfer and enzymatic reaction of microorganisms are enhanced by adding the iron ore matrix, so that the high-efficiency removal of ammonia nitrogen is realized.
2. The Fe-C reinforced artificial wetland denitrification system ensures the high-efficiency removal of nitrogen through the supply of the carbon source in the slow-release carbon source matrix.
3. The Fe-C enhanced artificial wetland denitrification system realizes efficient nitrification and denitrification processes by the combination of the iron ore substrate vertical flow artificial wetland and the slow-release carbon source substrate horizontal flow artificial wetland.
4. The Fe-C enhanced constructed wetland denitrification system has the nitrogen removal rate of over 90 percent.
Drawings
FIG. 1 is a schematic structural diagram of a Fe-C enhanced constructed wetland denitrification system of the invention.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: the Fe-C enhanced constructed wetland denitrification system in the embodiment comprises a water storage tank 1, a water inlet peristaltic pump 2, wetland plants 3, a first iron ore substrate vertical flow constructed wetland 4-1, a second iron ore substrate vertical flow constructed wetland 4-2, a slow-release carbon source substrate horizontal flow constructed wetland 5 and a water outlet pipe 6, wherein the denitrification system comprises the water storage tank 1, the water inlet peristaltic pump 2, the first iron ore substrate vertical flow constructed wetland 4-1, the second iron ore substrate vertical flow constructed wetland 4-2, the slow-release carbon source substrate horizontal flow constructed wetland 5 and the water outlet pipe 6 which are sequentially arranged, a first iron ore substrate vertical flow constructed wetland water outlet 4-1-1 is arranged at the lower end of the first iron ore substrate vertical flow constructed wetland 4-1, a second iron ore substrate vertical flow constructed water outlet 4-2 is arranged at the lower end of the second iron ore substrate vertical flow constructed wetland 4-2 2, the water outlet pipe 6 is positioned at the lower end of the slow-release carbon source matrix horizontal flow artificial wetland 5, the first iron ore matrix vertical flow artificial wetland 4-1 and the second iron ore matrix vertical flow artificial wetland 4-2 are filled with iron ores, wetland plants 3 are planted on the first iron ore matrix vertical flow artificial wetland 4-1 and the second iron ore matrix vertical flow artificial wetland 4-2, and the matrix filled in the slow-release carbon source matrix horizontal flow artificial wetland 5 is made of carbon source materials.
The second embodiment is as follows: the difference between the embodiment and the specific embodiment is that the filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4-8 cm. The rest is the same as the first embodiment.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the carbon source material is any combination of one or more of wood, rice straw, corn cob and litter. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between the present embodiment and one of the first to third embodiments is that the filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1-5 cm. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the difference between the first embodiment and the fourth embodiment is that the wetland plant 3 is one or any combination of loosestrife, canna, cattail and calamus. The rest is the same as one of the first to fourth embodiments.
When the wetland plant 3 described in the present embodiment is a composition, the respective component compositions are in an arbitrary ratio.
The sixth specific implementation mode: the difference between the embodiment and one of the first to fifth embodiments is that the planting density of the wetland plants 3 is 0.025 plants/cm2. The rest is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between the present embodiment and one of the first to sixth embodiments is that the first and second iron ore substrate vertical-flow artificial wetlands 4-1 and 4-2 have an inner diameter of 10cm and a height of 40 cm. The rest is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the difference between the embodiment and one of the first to seventh embodiments is that the length, width and height of the slow-release carbon source substrate horizontal flow artificial wetland 5 are 20cm, 5cm and 30cm respectively. The rest is the same as one of the first to seventh embodiments.
The specific implementation method nine: the denitrification method of the Fe-C reinforced artificial wetland denitrification system comprises the following steps:
pumping wastewater from a reservoir 1 through a water inlet peristaltic pump 2, firstly entering a first iron ore matrix vertical flow artificial wetland 4-1 from the top of the first iron ore matrix vertical flow artificial wetland 4-1, then entering a second iron ore matrix vertical flow artificial wetland 4-2 from the top of the second iron ore matrix vertical flow artificial wetland 4-2, then entering a slow-release carbon source matrix horizontal flow artificial wetland 5 from the water outlet of the second iron ore matrix vertical flow artificial wetland 4-2, and finally exiting water from a water outlet pipe 6, wherein the hydraulic retention time is 0.5-2 days.
The following experiments are adopted to verify the effect of the invention:
experiment one:
the denitrification method adopting the Fe-C reinforced artificial wetland denitrification system comprises the following steps:
constructing an Fe-C reinforced artificial wetland denitrification system with daily treated water volume of 15L, respectively setting the concentration mean values of COD, TN and TP as 150, and (2) pumping 16 and 8mg/L wastewater from a reservoir 1 through a water inlet peristaltic pump 2, firstly entering a first iron ore matrix vertical flow artificial wetland 4-1 from the top of the first iron ore matrix vertical flow artificial wetland 4-1, then entering a second iron ore matrix vertical flow artificial wetland 4-2 from the top of the second iron ore matrix vertical flow artificial wetland 4-2 from the water outlet of the first iron ore matrix vertical flow artificial wetland 4-1-1, then entering a slow-release carbon source matrix horizontal flow artificial wetland 5 from the water outlet pipe 6 from the water outlet of the second iron ore matrix vertical flow artificial wetland 4-2, and finally exiting water from a water outlet pipe 6, wherein the Hydraulic Retention Time (HRT) is 0.5 day.
The substrates filled in the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2 are iron ores, wetland plants are planted on the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2, and the substrates filled in the slow-release carbon source substrate horizontal flow artificial wetland 5 are carbon source materials.
The filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4 cm.
The carbon source material is any combination of wood, rice straw, corn cob and litter.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1 cm.
The wetland plant is any combination of a plurality of loosestrife, canna, cattail and calamus.
The planting density of the wetland plants is 0.025 plants/cm2。
The inner diameter of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 10cm, and the height of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 40 cm.
The length, width and height of the slow-release carbon source substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 cm.
The result shows that under the continuous operation condition, the nitrogen removal rate of the Fe-C enhanced artificial wetland denitrification system is 81 percent and exceeds 80 percent.
Experiment two:
the denitrification method adopting the Fe-C reinforced artificial wetland denitrification system comprises the following steps:
constructing an Fe-C reinforced artificial wetland denitrification system with daily treated water volume of 15L, respectively setting the concentration mean values of COD, TN and TP as 150, the waste water of 16 mg/L and 8mg/L is pumped out from a water storage tank 1 through a water inlet peristaltic pump 2, firstly enters a first iron ore matrix vertical flow artificial wetland 4-1 from the top of a first iron ore matrix vertical flow artificial wetland 4-1, and then enters a second iron ore matrix vertical flow artificial wetland 4-2 from the top of a second iron ore matrix vertical flow artificial wetland 4-2, and then enters a slow-release carbon source matrix horizontal flow artificial wetland 5 from the water outlet of the second iron ore matrix vertical flow artificial wetland 4-2, and finally exits from a water outlet pipe 6, wherein the hydraulic retention time is 1 day.
The substrates filled in the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2 are iron ores, wetland plants are planted on the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2, and the substrates filled in the slow-release carbon source substrate horizontal flow artificial wetland 5 are carbon source materials.
The filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4 cm.
The carbon source material is any combination of wood, rice straw, corn cob and litter.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1 cm.
The wetland plant is any combination of a plurality of loosestrife, canna, cattail and calamus.
The planting density of the wetland plants is 0.025 plants/cm2。
The inner diameter of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 10cm, and the height of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 40 cm.
The length, width and height of the slow-release carbon source substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 cm.
The result shows that under the continuous operation condition, the nitrogen removal rate of the Fe-C enhanced artificial wetland denitrification system is 87 percent and exceeds 85 percent.
Experiment three:
the denitrification method adopting the Fe-C reinforced artificial wetland denitrification system comprises the following steps:
constructing an Fe-C reinforced artificial wetland denitrification system with daily treated water volume of 15L, respectively setting the concentration mean values of COD, TN and TP as 150, the waste water of 16 mg/L and 8mg/L is pumped out from a water storage tank 1 through a water inlet peristaltic pump 2, firstly enters a first iron ore matrix vertical flow artificial wetland 4-1 from the top of a first iron ore matrix vertical flow artificial wetland 4-1, and then enters a second iron ore matrix vertical flow artificial wetland 4-2 from the top of a second iron ore matrix vertical flow artificial wetland 4-2, and then enters a slow-release carbon source matrix horizontal flow artificial wetland 5 from the water outlet of the second iron ore matrix vertical flow artificial wetland 4-2, and finally exits from a water outlet pipe 6, wherein the hydraulic retention time is 2 days.
The substrates filled in the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2 are iron ores, wetland plants are planted on the first iron ore substrate vertical flow artificial wetland 4-1 and the second iron ore substrate vertical flow artificial wetland 4-2, and the substrates filled in the slow-release carbon source substrate horizontal flow artificial wetland 5 are carbon source materials.
The filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4 cm.
The carbon source material is any combination of wood, rice straw, corn cob and litter.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1 cm.
The wetland plant is any combination of a plurality of loosestrife, canna, cattail and calamus.
The planting density of the wetland plants is 0.025 plants/cm2。
The inner diameter of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 10cm, and the height of the first iron ore substrate vertical flow artificial wetland and the second iron ore substrate vertical flow artificial wetland is 40 cm.
The length, width and height of the slow-release carbon source substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 cm.
The result shows that under the continuous operation condition, the nitrogen removal rate of the Fe-C enhanced artificial wetland denitrification system is 93 percent and exceeds 90 percent.
Claims (9)
- The Fe-C enhanced constructed wetland denitrification system is characterized by comprising a reservoir (1), a water inlet peristaltic pump (2), wetland plants (3), a first iron ore matrix vertical flow constructed wetland (4-1), a second iron ore matrix vertical flow constructed wetland (4-2), a slow-release carbon source matrix horizontal flow constructed wetland (5) and a water outlet pipe (6), wherein the denitrification system is arranged in sequence of the reservoir (1), the water inlet peristaltic pump (2), the first iron ore matrix vertical flow constructed wetland (4-1), the second iron ore matrix vertical flow constructed wetland (4-2), the slow-release carbon source matrix horizontal flow constructed wetland (5) and the water outlet pipe (6), the lower end of the first iron ore matrix vertical flow constructed wetland (4-1) is provided with a first iron ore matrix vertical flow constructed wetland water outlet (4-1-1) The lower end of the second iron ore matrix vertical flow artificial wetland (4-2) is provided with a second iron ore matrix vertical flow artificial wetland water outlet (4-2-2), the water outlet pipe (6) is positioned at the lower end of the slow-release carbon source matrix horizontal flow artificial wetland (5), the first iron ore matrix vertical flow artificial wetland (4-1), the second iron ore matrix vertical flow artificial wetland (4-2) and the filled matrix are made of iron ore, wetland plants (3) are planted on the first iron ore matrix vertical flow artificial wetland (4-1) and the second iron ore matrix vertical flow artificial wetland (4-2), and the matrix filled in the slow-release carbon source matrix horizontal flow artificial wetland (5) is made of carbon source materials.
- 2. The Fe-C enhanced constructed wetland denitrification system of claim 1, wherein the filling thickness of the iron ore is not more than 40cm, and the particle size of the iron ore is 4-8 cm.
- 3. The Fe-C enhanced artificial wetland denitrification system of claim 1, wherein the carbon source material is one or more of wood, rice straw, corn cob and litter.
- 4. The Fe-C enhanced constructed wetland denitrification system according to claim 1 or 3, wherein the filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 1-5 cm.
- 5. The Fe-C enhanced artificial wetland denitrification system according to claim 1, wherein the wetland plants (3) are one or more of Lythra, canna, Typha and Acorus calamus in any combination.
- 6. The Fe-C enhanced constructed wetland denitrification system according to claim 1 or 5, wherein the wetland plants (3) are planted at a density of 0.025 plants/cm2。
- 7. The Fe-C enhanced constructed wetland denitrification system according to claim 1, wherein the first iron ore substrate vertical flow constructed wetland (4-1) and the second iron ore substrate vertical flow constructed wetland (4-2) have an inner diameter of 10cm and a height of 40 cm.
- 8. The Fe-C enhanced artificial wetland denitrification system according to claim 1, wherein the length, the width and the height of the slow-release carbon source matrix horizontal flow artificial wetland (5) are 20cm, 5cm and 30cm respectively.
- 9. The denitrification method of the Fe-C enhanced constructed wetland denitrification system of claim 1 is characterized in that the denitrification method comprises the following steps:pumping wastewater from a reservoir (1) through a water inlet peristaltic pump (2), firstly entering a first iron ore matrix vertical flow artificial wetland (4-1) from the top of the first iron ore matrix vertical flow artificial wetland (4-1), then entering a second iron ore matrix vertical flow artificial wetland (4-2) from the top of the second iron ore matrix vertical flow artificial wetland (4-2) from the water outlet (4-1-1) of the first iron ore matrix vertical flow artificial wetland, then entering a slow-release carbon source matrix horizontal flow artificial wetland (5) from the water outlet (4-2-2) of the second iron ore matrix vertical flow artificial wetland, and then exiting water from a water outlet pipe (6), wherein the hydraulic retention time is 0.5-2 days.
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| CN201722257U (en) * | 2010-07-02 | 2011-01-26 | 北京特兰斯福生态环境科技发展有限公司 | Novel unpowered constructed wetland sewage treatment system |
| CN203768122U (en) * | 2014-01-22 | 2014-08-13 | 同济大学 | Vertical flow-horizontal flow compound artificial wetland high-efficiency denitrification system |
| CN107512775A (en) * | 2017-09-29 | 2017-12-26 | 中国科学院东北地理与农业生态研究所 | A kind of temperature adjusting method of artificial wet land system and strengthened artificial wet land system hypothermia operation |
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- 2019-12-17 CN CN201911301822.2A patent/CN111003809A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20060108804A (en) * | 2005-04-14 | 2006-10-18 | 창원대학교 산학협력단 | Sewage treatment system made by artificial reediness |
| CN201722257U (en) * | 2010-07-02 | 2011-01-26 | 北京特兰斯福生态环境科技发展有限公司 | Novel unpowered constructed wetland sewage treatment system |
| CN203768122U (en) * | 2014-01-22 | 2014-08-13 | 同济大学 | Vertical flow-horizontal flow compound artificial wetland high-efficiency denitrification system |
| CN107512775A (en) * | 2017-09-29 | 2017-12-26 | 中国科学院东北地理与农业生态研究所 | A kind of temperature adjusting method of artificial wet land system and strengthened artificial wet land system hypothermia operation |
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