CN111003808A - Mn-C enhanced constructed wetland denitrification system and denitrification method - Google Patents
Mn-C enhanced constructed wetland denitrification system and denitrification method Download PDFInfo
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- CN111003808A CN111003808A CN201911301820.3A CN201911301820A CN111003808A CN 111003808 A CN111003808 A CN 111003808A CN 201911301820 A CN201911301820 A CN 201911301820A CN 111003808 A CN111003808 A CN 111003808A
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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
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Abstract
A Mn-C enhanced 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 denitrification system comprises a reservoir, a water inlet peristaltic pump, wetland plants, a manganese ore matrix horizontal flow artificial wetland, a slow-release carbon source matrix horizontal flow artificial wetland and a water outlet pipe, wherein the chemical oxidation removal process of ammonia nitrogen is effectively enhanced by adding the manganese ore matrix and utilizing the strong oxidation capacity of high-valence manganese, and the ammonia nitrogen is fully converted into denitrification substrates such as nitrate nitrogen, nitrite nitrogen and the like; meanwhile, the oxygen secretion of the plant root system also provides necessary material and capacity foundation for the biological nitrification process of the root system biological membrane. The Mn-C enhanced constructed wetland nitrogen removal system has the nitrogen removal rate of over 95 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
As a main commercial grain production base in China, the northeast China has serious nitrogen loss in farmland due to application of excessive nitrogen fertilizer and low utilization rate of nitrogen fertilizer by crops, and serious hidden danger of eutrophication is brought because pollutants such as nitrogen (such as ammonia nitrogen and nitrate nitrogen) in farmland return water enter peripheral receiving water bodies. 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 Mn-C enhanced constructed wetland denitrification system and a denitrification method.
The Mn-C reinforced artificial wetland denitrification system comprises a reservoir, a water inlet peristaltic pump, wetland plants, a manganese ore substrate horizontal flow artificial wetland, a slow-release carbon source substrate horizontal flow artificial wetland and a water outlet pipe, the denitrification system is arranged according to the sequence of the reservoir, the water inlet peristaltic pump, the manganese ore substrate horizontal flow artificial wetland, the slow-release carbon source substrate horizontal flow artificial wetland and the water outlet pipe, wetland plants are planted on the manganese ore substrate horizontal flow constructed wetland and the slow-release carbon source substrate horizontal flow constructed wetland, the upper end of the manganese ore matrix horizontal flow artificial wetland is provided with a manganese ore matrix horizontal flow artificial wetland water outlet, a water outlet pipe is positioned at the upper end of the slow-release carbon source matrix horizontal flow artificial wetland, the matrix filled in the manganese ore matrix horizontal flow artificial wetland is manganese ore, and the matrix filled in the slow-release carbon source matrix horizontal flow artificial wetland is a carbon source material.
The filling thickness of the manganese ore is not more than 30cm, and the particle size is 3-5 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 0.3 plants/cm2。
The length, the width and the height of the manganese ore substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 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 Mn-C enhanced constructed wetland denitrification system comprises the following steps:
and pumping the wastewater from the reservoir through a water inlet peristaltic pump, feeding the wastewater into the manganese ore substrate horizontal flow artificial wetland from the top of the manganese ore substrate horizontal flow artificial wetland, feeding the effluent from a water outlet of the manganese ore substrate horizontal flow artificial wetland into the slow-release carbon source substrate horizontal flow artificial wetland from the top of the slow-release carbon source substrate horizontal flow artificial wetland, and then discharging the effluent from a water outlet pipe, wherein the hydraulic retention time is 1 day.
The Mn-C reinforced constructed wetland nitrogen removal system consists of a manganese ore matrix horizontal flow constructed wetland and a slow-release carbon source matrix horizontal flow constructed wetland. And the wastewater in the reservoir is pumped into the manganese ore substrate horizontal flow artificial wetland and the slow-release carbon source substrate horizontal flow artificial wetland by a peristaltic pump at a certain concentration and flow rate, and the high-efficiency denitrification process of the combined system is realized by coupling the chemical oxidation and microbial nitrification of the manganese ore substrate and the denitrification of the slow-release carbon source.
The method effectively strengthens the chemical oxidation removal process of ammonia nitrogen by adding the manganese ore matrix and utilizing the strong oxidation capacity of high-valence manganese, and fully converts the manganese ore matrix into denitrification substrates such as nitrate nitrogen, nitrite nitrogen and the like; meanwhile, the oxygen secretion of the plant root system also provides necessary material and capacity foundation for the biological nitrification process of the root system biological membrane. The addition of the slow-release carbon source matrix provides necessary carbon source and energy supply for the denitrification process; the organic combination of the two systems leads the system to have high-efficiency denitrification capability.
The invention has the following advantages:
1. the Mn-C enhanced constructed wetland nitrogen removal system realizes efficient conversion and removal of ammonia nitrogen by combining chemical oxidation of high-valence manganese in a manganese ore matrix with aerobic nitrification of root microorganisms.
2. The Mn-C reinforced constructed wetland nitrogen removal system ensures the full progress of denitrification through the supply of the carbon source in the slow-release carbon source matrix.
3. The Mn-C reinforced constructed wetland nitrogen removal system realizes efficient nitrification and denitrification processes through the combination of the manganese ore substrate horizontal flow constructed wetland and the slow-release carbon source substrate horizontal flow constructed wetland.
4. The Mn-C enhanced constructed wetland nitrogen removal system has the nitrogen removal rate of over 95 percent.
Drawings
FIG. 1 is a schematic structural diagram of a Mn-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 Mn-C enhanced constructed wetland denitrification system in the embodiment comprises a reservoir 1, a water inlet peristaltic pump 2, wetland plants 3, a manganese ore substrate horizontal flow constructed wetland 4, a slow-release carbon source substrate horizontal flow constructed wetland 5 and a water outlet pipe 6, wherein the denitrification system is arranged in the order of the reservoir 1, the water inlet peristaltic pump 2, the manganese ore substrate horizontal flow constructed wetland 4, the slow-release carbon source substrate horizontal flow constructed wetland 5 and the water outlet pipe 6, the wetland plants 3 are planted on the manganese ore substrate horizontal flow constructed wetland 4 and the slow-release carbon source substrate horizontal flow constructed wetland 5, a manganese ore substrate horizontal flow constructed wetland water outlet 4-1 is arranged at the upper end of the manganese ore substrate horizontal flow constructed wetland 4, the water outlet pipe 6 is positioned at the upper end of the carbon source slow-release substrate horizontal flow constructed wetland 5, and manganese ore is filled in the manganese ore substrate horizontal flow constructed wetland 4, the matrix filled in the slow-release carbon source matrix horizontal flow artificial wetland 5 is a carbon source material.
The second embodiment is as follows: the difference between the embodiment and the first embodiment is that the filling thickness of the manganese ore is not more than 30cm, and the particle size is 3-5 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.
When the carbon source material described in the present embodiment is a composition, the ratio of the components is arbitrary.
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 ratio of the components is arbitrary.
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 0.3 plants/cm2. The rest is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between the embodiment and one of the first to sixth embodiments is that the length, width and height of the manganese ore substrate horizontal flow artificial wetland 4 are 20cm, 5cm and 30cm respectively. 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 Mn-C enhanced constructed wetland denitrification system adopting the first embodiment comprises the following steps:
and pumping the wastewater out of the reservoir 1 through a water inlet peristaltic pump 2, firstly entering the manganese ore substrate horizontal flow artificial wetland 4 from the top of the manganese ore substrate horizontal flow artificial wetland 4, then entering the slow-release carbon source substrate horizontal flow artificial wetland 5 from the top of the slow-release carbon source substrate horizontal flow artificial wetland 5 from the water outlet 4-1 of the manganese ore substrate horizontal flow artificial wetland, and then discharging water from a water outlet pipe 6, wherein the hydraulic retention time is 1 day.
The following experiments are adopted to verify the effect of the invention:
experiment one:
a Mn-C enhanced artificial wetland denitrification system with daily treated water volume of 18L is constructed, wastewater with the concentration mean values of COD, TN and TP of 350, 56 and 8mg/L is pumped out from a reservoir 1 through a feed water peristaltic pump 2, enters a manganese ore substrate horizontal flow artificial wetland 4 from the top of the manganese ore substrate horizontal flow artificial wetland 4, and enters a slow-release carbon source substrate horizontal flow artificial wetland 5 from the top of the slow-release carbon source substrate horizontal flow artificial wetland 5 from a water outlet 4-1 of the manganese ore substrate horizontal flow artificial wetland, and then exits from a water outlet pipe 6, and the hydraulic retention time is 1 day.
The filling thickness of the manganese ore is not more than 30cm, and the particle size is 3 cm.
The carbon source material is wood.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 5 cm.
The wetland plant is canna.
The planting density of the wetland plants is 0.3 plants/cm2。
The length, the width and the height of the manganese ore substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 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 Mn-C enhanced artificial wetland denitrification system is 86 percent and exceeds 85 percent.
Experiment two:
a Mn-C enhanced artificial wetland denitrification system with daily treated water volume of 18L is constructed, wastewater with the concentration mean values of COD, TN and TP respectively of 250 mg/L, 36 mg/L and 8mg/L is pumped out from a reservoir 1 through a feed water peristaltic pump 2, enters a manganese ore substrate horizontal flow artificial wetland 4 from the top of the manganese ore substrate horizontal flow artificial wetland 4, and enters a slow-release carbon source substrate horizontal flow artificial wetland 5 from the top of the slow-release carbon source substrate horizontal flow artificial wetland 5 from a water outlet 4-1 of the manganese ore substrate horizontal flow artificial wetland, and then exits from a water outlet pipe 6, and the hydraulic retention time is 1 day.
The filling thickness of the manganese ore is not more than 30cm, and the particle size is 5 cm.
The carbon source material is corn stalks.
The filling thickness of the carbon source material is not more than 30cm, and the particle size of the carbon source material is 3 cm.
The wetland plant is typha orientalis.
The planting density of the wetland plants is 0.3 plants/cm2。
The length, the width and the height of the manganese ore substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 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 Mn-C enhanced artificial wetland denitrification system is 92 percent and exceeds 90 percent.
Experiment three:
a Mn-C enhanced artificial wetland denitrification system with daily treated water volume of 18L is constructed, wastewater with the concentration mean values of COD, TN and TP respectively of 150, 16 and 8mg/L is pumped out from a reservoir 1 through a feed peristaltic pump 2, enters a manganese ore substrate horizontal flow artificial wetland 4 from the top of the manganese ore substrate horizontal flow artificial wetland 4, and enters a slow-release carbon source substrate horizontal flow artificial wetland 5 from the top of the slow-release carbon source substrate horizontal flow artificial wetland 5 from a water outlet 4-1 of the manganese ore substrate horizontal flow artificial wetland, and then exits from a water outlet pipe 6, and the hydraulic retention time is 1 day.
The filling thickness of the manganese ore is not more than 30cm, and the particle size is 4 cm.
The carbon source material is the 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 a combination of loosestrife, canna, cattail and calamus.
The planting density of the wetland plants is 0.3 plants/cm2。
The length, the width and the height of the manganese ore substrate horizontal flow artificial wetland are respectively 20cm, 5cm and 30 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 Mn-C enhanced artificial wetland denitrification system is 96 percent and exceeds 95 percent.
Claims (9)
- The Mn-C enhanced constructed wetland denitrification system is characterized by comprising a reservoir (1), a water inlet peristaltic pump (2), wetland plants (3), a manganese ore matrix horizontal flow constructed wetland (4), 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 according to the reservoir (1), the water inlet peristaltic pump (2), the manganese ore matrix horizontal flow constructed wetland (4), the slow-release carbon source matrix horizontal flow constructed wetland (5) and the water outlet pipe (6), the wetland plants (3) are planted on the manganese ore matrix horizontal flow constructed wetland (4) and the slow-release carbon source matrix horizontal flow constructed wetland (5), a manganese ore matrix horizontal flow constructed wetland water outlet (4-1) is arranged at the upper end of the manganese ore matrix horizontal flow constructed wetland (4), the water outlet pipe (6) is positioned at the upper end of the slow-release carbon source matrix horizontal flow artificial wetland (5), the matrix filled in the manganese ore matrix horizontal flow artificial wetland (4) is manganese ore, and the matrix filled in the slow-release carbon source matrix horizontal flow artificial wetland (5) is a carbon source material.
- 2. The Mn-C enhanced constructed wetland denitrification system according to claim 1, wherein the manganese ore is filled to a thickness of not more than 30cm and has a particle size of 3-5 cm.
- 3. The Mn-C enhanced constructed wetland denitrification system of claim 1, wherein the carbon source material is one or more of wood, rice straw, corn cobs and litter.
- 4. The Mn-C enhanced constructed wetland denitrification system according to claim 1, wherein the filling thickness of the carbon source material is not more than 30cm, and the grain size of the carbon source material is 1-5 cm.
- 5. The Mn-C enhanced constructed wetland denitrification system according to claim 1, wherein the wetland plants (3) are one or more of Lythra, canna, Typha angustifolia and Acorus calamus in any combination.
- 6. The Mn-C enhanced constructed wetland denitrification system according to claim 1 or the claim, wherein the wetland plants (3) are planted at a density of 0.3 plants/cm2。
- 7. The Mn-C enhanced constructed wetland denitrification system according to claim 1, wherein the length, width and height of the manganese ore substrate horizontal flow constructed wetland (4) are respectively 20cm, 5cm and 30 cm.
- 8. The Mn-C enhanced constructed wetland denitrification system according to claim 1, wherein the length, width and height of the slow-release carbon source matrix horizontal flow constructed wetland (5) are 20cm, 5cm and 30cm respectively.
- 9. The denitrification method of the Mn-C enhanced constructed wetland denitrification system of claim 1 is characterized by comprising the following steps:the method comprises the steps of pumping wastewater out of a reservoir (1) through a water inlet peristaltic pump (2), firstly entering a manganese ore substrate horizontal flow artificial wetland (4) from the top of the manganese ore substrate horizontal flow artificial wetland (4), then entering a slow-release carbon source substrate horizontal flow artificial wetland (5) from the top of the manganese ore substrate horizontal flow artificial wetland (5) through effluent water of a manganese ore substrate horizontal flow artificial wetland water outlet (4-1), and then discharging water from a water outlet pipe (6), wherein the hydraulic retention time is 1 day.
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Cited By (2)
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| CN113526676A (en) * | 2021-08-06 | 2021-10-22 | 重庆大学 | Artificial wetland system capable of enhancing denitrification |
| CN116177742A (en) * | 2023-03-27 | 2023-05-30 | 重庆大学 | Multivalent manganese oxide filler and preparation method and application thereof |
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