CN112125408A - Biochar second-stage artificial wetland system - Google Patents
Biochar second-stage artificial wetland system Download PDFInfo
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- CN112125408A CN112125408A CN202011042086.6A CN202011042086A CN112125408A CN 112125408 A CN112125408 A CN 112125408A CN 202011042086 A CN202011042086 A CN 202011042086A CN 112125408 A CN112125408 A CN 112125408A
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- biochar
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- constructed wetland
- artificial wetland
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to a biochar secondary artificial wetland system which comprises a sedimentation tank, an undercurrent artificial wetland and a surface flow artificial wetland, wherein sewage flows into the undercurrent artificial wetland through the sedimentation tank and flows out of the surface artificial wetland through a water outlet pipe, the undercurrent artificial wetland sequentially comprises a surface plant layer, a soil layer, a main packing layer and a gravel bearing layer from top to bottom, a water inlet pipe extending out of the sedimentation tank extends into the soil layer, and the surface artificial wetland is a composite plant bed combined by various vegetations.
Description
Technical Field
The invention relates to a biochar two-stage artificial wetland system.
Background
The artificial wetland is a technology for treating sewage and sludge by using the physical, chemical and biological triple synergistic action of soil, artificial medium, plants and microorganisms in the process of flowing along a certain direction by using sewage and sludge which are controllably dosed to the artificially constructed wetland from the artificially constructed and controlled-operation ground similar to the marshland. The action mechanism of the plant nutrient solution comprises the actions of adsorption, detention, filtration, oxidation reduction, precipitation, microbial decomposition, transformation, plant shielding, residue accumulation, transpiration moisture and nutrient absorption and various animals.
Biochar is a solid product of biomass obtained by thermochemical conversion under anoxic conditions. The raw material source is wide, the cost is low, and the soil conditioner can be used for soil improvement after adsorbing phosphate. Therefore, the application of the biochar in phosphate removal can provide a new way for the treatment of agricultural and forestry waste, livestock and poultry manure, activated sludge and even invasive plants. On the other hand, the deficiency of other phosphorus removing agents can be made up.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a biochar secondary artificial wetland system which is reasonable in structure, convenient and fast.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a biological charcoal second grade constructed wetland system, includes sedimentation tank, undercurrent constructed wetland and surface current constructed wetland, and sewage flows in the undercurrent constructed wetland through the sedimentation tank to flow out to the surface constructed wetland through the outlet pipe, and undercurrent constructed wetland top-down includes surface plant layer, soil horizon, main packing layer, gravel supporting layer in proper order, and the inlet tube that the sedimentation tank extends into the soil horizon, surface constructed wetland is the compound plant bed of multiple vegetation combination.
Further, including undercurrent constructed wetland week portion and bottom enclose through the baffle and establish, surface current constructed wetland ring portion is in undercurrent constructed wetland periphery, the inlet tube extends to extend in the baffle gets into the soil horizon, the inlet tube gets into undercurrent constructed wetland back branch and is a plurality of water inlet branch pipes, water inlet branch pipe sets up along undercurrent constructed wetland length direction interval, and the equal level extends, water inlet branch pipe prolongs its length direction and has evenly seted up a plurality of inlet openings.
Further, the surface plant layer is composed of reed, cane shoots and cattail.
Further, the soil layer was filled with uniform loess having a thickness of 15cm and a 10-mesh sieve.
Further, the main packing layer comprises a fine packing layer and a coarse packing layer, the fine packing layer is positioned between the soil layer and the coarse packing layer, and the fine packing layer is filled with a biochar packing with the thickness of 15cm and the particle size of 5-6 mm; the coarse packing layer is filled with a biochar packing with the thickness of 25cm and the particle size of 8-10 mm.
Furthermore, the gravel bearing layer is filled with gravel with the thickness of 5cm and the particle size of 15-20 mm.
Further, the outlet pipe includes the connecting pipe, goes out the water and is responsible for, shunt tubes, it is located undercurrent constructed wetland bottom baffle below and extends along bottom baffle length direction to go out the water to be responsible for, the connecting pipe is vertical and is followed to go out the water and be responsible for length direction interval and insert and establish in a water top of being responsible for, and the connecting pipe upper end is extended upwards and is passed the baffle and get into gravel supporting layer below, the shunt tubes is responsible for length direction interval arrangement at its lateral part along going out the water.
Furthermore, the shunt tubes extend outwards into the surface artificial wetland, the shunt branch tubes are arranged on the side parts of the shunt branch tubes at intervals along the length direction of the shunt branch tubes, the shunt branch tubes are communicated with the shunt tubes, and water outlet holes are densely distributed at the lower ends of the shunt branch tubes.
Further, the vegetation of the composite plant bed is PO4 3—Canna and saxifraga with strong P adsorption capacity.
The working process of the biochar secondary artificial wetland system is carried out according to the following steps: firstly, sewage enters a sedimentation tank for sedimentation, then flows into a soil layer through a water inlet pipe, water is uniformly distributed in the soil layer, then the sewage enters an upper layer of a undercurrent area, the part close to the soil layer is a fine packing layer consisting of aerobic microorganisms and a biochar packing, and the biochar is used for treating NH4 +-N、PO4 3-The P has a certain adsorption capacity, the dissolved oxygen content in the section is higher, and the metabolism of aerobic microorganisms is utilized to improve the wetlandSystem for COD and NH4 +Removing N, wherein aerobic nitrification microorganisms carry out nitrification reaction, and nitrified liquid flows into a lower coarse filler layer; the coarse filler layer is far away from the soil layer and is composed of anoxic microorganisms and a biochar filler, the biochar has high carbon content and can provide a denitrification carbon source for denitrifying microorganisms, the dissolved oxygen content of the section is low, and an anoxic environment can be formed in the biochar to cause denitrification to form, so that the denitrification effect is achieved; finally, the sewage is discharged into the surface flow constructed wetland through a water outlet pipe after passing through the gravel supporting layer; the surface flow constructed wetland has good absorption effect on phosphorus, and the effluent water after phosphorus removal reaches the standard and is discharged into natural water.
Compared with the prior art, the invention has the following beneficial effects:
(1) the constructed wetland treatment system is suitable for treating sewage in mountainous terrain in rural areas and scenic spots, and can save resources such as pump station electric power and the like by means of gravity flow.
(2) The constructed wetland treatment system adopts a plurality of groups of parallel working, is easy to maintain, has the advantage of stable operation, has good COD removal and denitrification and dephosphorization effects, and can optimize the defect of easy blockage of the subsurface wetland by adopting multi-layer fillers with different particle sizes.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention;
3 FIG. 3 2 3 is 3 a 3 cross 3- 3 sectional 3 view 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3
FIG. 3 is a schematic diagram of a pipeline distribution according to an embodiment of the present invention.
In the figure: 1-a sedimentation tank, 2-an undercurrent artificial wetland, 3-a surface current artificial wetland, 4-a water outlet pipe, 5-a surface plant layer, 6-a soil layer, 7-a main packing layer, 8-a gravel bearing layer, 9-a water inlet pipe, 10-a composite plant bed, 11-a baffle, 12-a water inlet branch pipe, 13-a water inlet hole, 14-a fine packing layer, 15-a coarse packing layer, 16-a connecting pipe, 17-a water outlet main pipe, 18-a shunt pipe, 19-a shunt branch pipe and 20-a water outlet hole.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 3, a biochar two-stage constructed wetland system comprises a sedimentation tank 1, an undercurrent constructed wetland 2 and a surface flow constructed wetland 3, sewage flows into the undercurrent constructed wetland through the sedimentation tank and flows out of the surface constructed wetland through a water outlet pipe 4, the undercurrent constructed wetland comprises a surface plant layer 5, a soil layer 6, a main packing layer 7 and a gravel supporting layer 8 from top to bottom in sequence, a water inlet pipe 9 extending out of the sedimentation tank extends into the soil layer, and the surface constructed wetland is a composite plant bed 10 combined by various vegetations.
In the embodiment of the invention, sewage enters a sedimentation tank for pretreatment, impurities with larger particle sizes are removed, and then the sewage is introduced into the subsurface flow constructed wetland, the sedimentation tank is of a general design and is not described herein, and the wetland system generally utilizes natural slope terrain to ensure that the sewage flows through a plurality of packing layers of the subsurface flow by means of gravity flow and enters the surface flow constructed wetland for surface overflow flow.
In the embodiment of the invention, the periphery and the bottom of the subsurface flow artificial wetland are surrounded by the baffle 11, the baffle can be replaced by an enclosing wall, the ring part of the surface flow artificial wetland is arranged at the periphery of the subsurface flow artificial wetland, the water inlet pipe extends through the baffle and enters the soil layer, the water inlet pipe is branched into a plurality of water inlet branch pipes 12 after entering the subsurface flow artificial wetland, the water inlet branch pipes are arranged at intervals along the length direction of the subsurface flow artificial wetland and extend horizontally, and the water inlet branch pipes are uniformly provided with a plurality of water inlet holes 13 along the length direction of the water inlet branch pipes.
In the embodiment of the invention, the surface plant layer is composed of reed, wild rice stem and cattail, and generally comprises 20 reed plants with the plant height of 0.4-0.8 m, wild rice stem plants with the plant height of 1-2 m and cattail plants with the plant height of 1-1.5 m.
In the examples of the present invention, the soil layer was filled with uniform loess having a thickness of 15cm and a 10-mesh sieve.
In the embodiment of the invention, the main packing layer comprises a fine packing layer 14 and a coarse packing layer 15, the fine packing layer is positioned between the soil layer and the coarse packing layer, and the fine packing layer is filled with a biochar packing with the thickness of 15cm and the particle size of 5-6 mm; the coarse packing layer is filled with a biochar packing with the thickness of 25cm and the particle size of 8-10 mm.
In the embodiment of the invention, the gravel bearing layer is filled with gravel with the thickness of 5cm and the particle size of 15-20 mm.
In the embodiment of the invention, the water outlet pipe comprises a connecting pipe 16, a main water outlet pipe 17 and a flow dividing pipe 18, the main water outlet pipe is positioned below the bottom baffle of the subsurface flow constructed wetland and extends along the length direction of the bottom baffle, the connecting pipe is vertical and is inserted at the top of the main water outlet pipe at intervals along the length direction of the main water outlet pipe, the upper end of the connecting pipe extends upwards to extend through the baffle to enter the position below the gravel bearing layer, the flow dividing pipe is arranged at the side part of the main water outlet pipe at intervals along the length direction of the main water outlet pipe, and the top of the.
In the embodiment of the invention, the shunt tubes extend outwards into the surface artificial wetland, the shunt tubes are provided with shunt branch tubes 19 at intervals on the side parts along the length direction of the shunt tubes, the shunt branch tubes are communicated with the shunt tubes, and water outlet holes 20 are densely distributed at the lower ends of the shunt tubes.
In the embodiment of the invention, the vegetation of the composite plant bed is PO4 3-Canna and saxifraga with strong P adsorption capacity can enhance the dephosphorization effect of the whole system and can enhance the adsorption and removal of COD. The sewage passes through the four treatment units, and finally the effluent reaches the standard and is discharged into a natural water body.
The working process of the biochar secondary artificial wetland system is carried out according to the following steps: firstly, sewage enters a sedimentation tank for sedimentation, then flows into a soil layer through a water inlet pipe, water is uniformly distributed in the soil layer, then the sewage enters an upper layer of a undercurrent area, the part close to the soil layer is a fine packing layer consisting of aerobic microorganisms and a biochar packing, and the biochar is used for treating NH4 +-N、PO4 3-the-P has certain adsorption capacity, the dissolved oxygen content is higher, and the metabolism of aerobic microorganisms is utilized to improve the COD and NH of the wetland system4 +Removing N, wherein aerobic nitrification microorganisms carry out nitrification reaction, and nitrified liquid flows into a lower coarse filler layer; the coarse packing layer is far from the soil layer and is composed of oxygen-deficient particlesThe biological carbon has high carbon content, can provide a denitrification carbon source for denitrifying microorganisms, has low dissolved oxygen content at the section, and can form an anoxic environment in the biological carbon to cause the formation of denitrification so as to achieve the denitrification effect; finally, the sewage is discharged into the surface flow constructed wetland through a water outlet pipe after passing through the gravel supporting layer; the surface flow constructed wetland has good absorption effect on phosphorus, and the effluent water after phosphorus removal reaches the standard and is discharged into natural water.
The invention is not limited to the best mode, and any person can derive other various forms of biochar secondary artificial wetland systems according to the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (10)
1. A biochar second-stage constructed wetland system is characterized in that: the subsurface flow constructed wetland comprises a sedimentation tank, a subsurface flow constructed wetland and a surface flow constructed wetland, wherein sewage flows into the subsurface flow constructed wetland through the sedimentation tank and flows out of the surface constructed wetland through a water outlet pipe, the subsurface flow constructed wetland sequentially comprises a surface plant layer, a soil layer, a main packing layer and a gravel bearing layer from top to bottom, a water inlet pipe extending out of the sedimentation tank extends into the soil layer, and the surface constructed wetland is a composite plant bed combined by various vegetations.
2. The biochar secondary artificial wetland system as recited in claim 1, wherein: the subsurface flow constructed wetland includes a peripheral part and a bottom part which are surrounded by a baffle, a surface flow constructed wetland ring part is arranged on the periphery of the subsurface flow constructed wetland, the water inlet pipe extends through the baffle to enter a soil layer, the water inlet pipe is branched into a plurality of water inlet branch pipes after entering the subsurface flow constructed wetland, the water inlet branch pipes are arranged at intervals along the length direction of the subsurface flow constructed wetland and extend horizontally, and the water inlet branch pipes are uniformly provided with a plurality of water inlet holes along the length direction of the water inlet branch pipes.
3. The biochar secondary artificial wetland system as recited in claim 1, wherein: the surface plant layer is composed of reed, cane shoots and cattail.
4. The biochar secondary artificial wetland system as recited in claim 1, wherein: the soil layer was filled with uniform loess having a thickness of 15cm and a 10-mesh sieve.
5. The biochar secondary artificial wetland system as recited in claim 1, wherein: the main packing layer comprises a fine packing layer and a coarse packing layer, the fine packing layer is positioned between the soil layer and the coarse packing layer, and the fine packing layer is filled with a biochar packing with the thickness of 15cm and the particle size of 5-6 mm; the coarse packing layer is filled with a biochar packing with the thickness of 25cm and the particle size of 8-10 mm.
6. The biochar secondary artificial wetland system as recited in claim 1, wherein: the gravel bearing layer is filled with gravel with the thickness of 5cm and the particle size of 15-20 mm.
7. The biochar secondary artificial wetland system as recited in claim 2, wherein: the outlet pipe includes the connecting pipe, goes out water and is responsible for, shunt tubes, it is located undercurrent constructed wetland bottom baffle below and extends along bottom baffle length direction to go out the water and be responsible for, the connecting pipe is vertical and insert along going out water and be established and go out water and be responsible for the top at length direction interval, and the connecting pipe upper end is extended upwards and is passed the baffle and get into gravel supporting layer below, the shunt tubes is responsible for length direction interval arrangement at its lateral part along going out water.
8. The biochar secondary artificial wetland system as recited in claim 7, wherein: the shunt tubes extend outwards into the surface artificial wetland, the shunt branch tubes are arranged on the side parts of the shunt branch tubes at intervals along the length direction of the shunt branch tubes, the shunt branch tubes are communicated with the shunt tubes, and water outlet holes are densely distributed at the lower ends of the shunt branch tubes.
9. The biochar secondary artificial wetland system as recited in claim 1, wherein: the vegetation of the composite plant bed is PO4 3—Canna and saxifraga with strong P adsorption capacity.
10. The working process of the biochar secondary artificial wetland system is characterized in that the biochar secondary artificial wetland system as claimed in any one of claims 1 to 9 is adopted and is carried out according to the following steps: firstly, sewage enters a sedimentation tank for sedimentation, then flows into a soil layer through a water inlet pipe, water is uniformly distributed in the soil layer, then the sewage enters an upper layer of a undercurrent area, the part close to the soil layer is a fine packing layer consisting of aerobic microorganisms and a biochar packing, and the biochar is used for treating NH4 +-N、PO4 3-the-P has certain adsorption capacity, the dissolved oxygen content is higher, and the metabolism of aerobic microorganisms is utilized to improve the COD and NH of the wetland system4 +Removing N, wherein aerobic nitrification microorganisms carry out nitrification reaction, and nitrified liquid flows into a lower coarse filler layer; the coarse filler layer is far away from the soil layer and is composed of anoxic microorganisms and a biochar filler, the biochar has high carbon content and can provide a denitrification carbon source for denitrifying microorganisms, the dissolved oxygen content of the section is low, and an anoxic environment can be formed in the biochar to cause denitrification to form, so that the denitrification effect is achieved; finally, the sewage is discharged into the surface flow constructed wetland through a water outlet pipe after passing through the gravel supporting layer; the surface flow constructed wetland has good absorption effect on phosphorus, and the effluent water after phosphorus removal reaches the standard and is discharged into natural water.
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| CN202011042086.6A CN112125408A (en) | 2020-09-28 | 2020-09-28 | Biochar second-stage artificial wetland system |
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| CN202011042086.6A CN112125408A (en) | 2020-09-28 | 2020-09-28 | Biochar second-stage artificial wetland system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686868A (en) * | 2005-03-29 | 2005-10-26 | 华南农业大学 | Method for treating home wastewater through artificial wetland combined vertical current with surface current |
| US20090255862A1 (en) * | 2008-03-27 | 2009-10-15 | Mark Harrison | Eco-treament system |
| US8252182B1 (en) * | 2008-09-11 | 2012-08-28 | University Of Central Florida Research Foundation, Inc. | Subsurface upflow wetland system for nutrient and pathogen removal in wastewater treatment systems |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| KR20160104841A (en) * | 2015-02-26 | 2016-09-06 | 공주대학교 산학협력단 | Hybrid artificial wetland |
| CN109835987A (en) * | 2019-03-28 | 2019-06-04 | 生态环境部南京环境科学研究所 | A kind of surface stream-vertical subsurface flow wetland treatment process |
| CN111333273A (en) * | 2020-03-20 | 2020-06-26 | 广州市绿化公司 | Enhanced nitrogen and phosphorus removal constructed wetland system |
-
2020
- 2020-09-28 CN CN202011042086.6A patent/CN112125408A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686868A (en) * | 2005-03-29 | 2005-10-26 | 华南农业大学 | Method for treating home wastewater through artificial wetland combined vertical current with surface current |
| US20090255862A1 (en) * | 2008-03-27 | 2009-10-15 | Mark Harrison | Eco-treament system |
| US8252182B1 (en) * | 2008-09-11 | 2012-08-28 | University Of Central Florida Research Foundation, Inc. | Subsurface upflow wetland system for nutrient and pathogen removal in wastewater treatment systems |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| KR20160104841A (en) * | 2015-02-26 | 2016-09-06 | 공주대학교 산학협력단 | Hybrid artificial wetland |
| CN109835987A (en) * | 2019-03-28 | 2019-06-04 | 生态环境部南京环境科学研究所 | A kind of surface stream-vertical subsurface flow wetland treatment process |
| CN111333273A (en) * | 2020-03-20 | 2020-06-26 | 广州市绿化公司 | Enhanced nitrogen and phosphorus removal constructed wetland system |
Non-Patent Citations (1)
| Title |
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| 王若凡等: "《生物炭折流湿地对生活污水的净化效果》", 《农业环境科学学报》 * |
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