CN111995196A - An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio - Google Patents
An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio Download PDFInfo
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- CN111995196A CN111995196A CN202010981069.2A CN202010981069A CN111995196A CN 111995196 A CN111995196 A CN 111995196A CN 202010981069 A CN202010981069 A CN 202010981069A CN 111995196 A CN111995196 A CN 111995196A
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- constructed 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F2101/30—Organic compounds
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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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/15—N03-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention relates to An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio. In the invention, sewage flows through the horizontal subsurface flow constructed wetland and the vertical subsurface flow constructed wetland in sequence, then the effluent part flows back to the horizontal subsurface flow constructed wetland, and the coupling of aerobic Ammonia Oxidizing Bacteria (AOB), Nitrite Oxidizing Bacteria (NOB) and anaerobic ammonia oxidizing bacteria (Anammox) is realized in the vertical subsurface flow constructed wetland by adjusting the effluent water level and utilizing the Dissolved Oxygen (DO) gradient, so that the denitrification efficiency of the composite wetland system on the sewage with low C/N ratio is improved. The composite artificial wetland system is filled with fillers such as broken bricks, oyster shells and the like with large specific surface area, developed pores and good adsorption capacity, so that the biological holding capacity of the system is greatly improved, and higher phosphorus and nitrogen removal efficiency is ensured.
Description
Technical Field
The invention belongs to the field of water pollution control, and particularly relates to An/O composite HSSF-VSSF system for strengthening treatment of low C/N ratio sewage.
Background
Although the traditional biological nitrogen and phosphorus removal way plays a certain role in the sewage treatment process, a plurality of bottlenecks still exist. Such as: the complete conversion of ammonia nitrogen into nitrate nitrogen consumes a large amount of dissolved oxygen in water, so that the aeration cost is increased; the treatment of the sewage with low C/N ratio or the sewage with high carbon nitrogen phosphorus needs to depend on an external organic carbon source to improve the pollutant removal efficiency; the aerobic biological phosphorus removal process increases power consumption and can generate a large amount of excess sludge; the whole treatment process has the advantages of longer flow, large occupied area, high investment cost and the like. In recent years, although several novel biological nitrogen and phosphorus removal processes have low energy consumption, carbon source saving, small sludge yield and small occupied area, the requirements on the water quality condition of sewage are strict, the structure and operation of treatment equipment are complex, the commissioning cost is still very high, the biological holding capacity of the system is low, the operation is unstable, the process is easily influenced by the change of the external environment, functional microorganisms in the system are easily influenced mutually, and the pollutant treatment performance is low. The artificial wetland has attracted wide attention as a novel sewage treatment process developed in the last 70 th century, and is gradually developed into a novel practical technology. But the construction area is large, the removal load of nitrogen and phosphorus is low, and the like, and the single-stage artificial wetland system is difficult to meet the requirement of deep purification of sewage.
Therefore, with the concept of energy conservation, emission reduction and ecological treatment, the novel multi-stage combined artificial wetland for treating sewage with low C/N ratio and synchronous carbon, nitrogen and phosphorus removal and the sewage treatment system for realizing stable operation, high efficiency and low cost treatment performance become necessary ways for the development of the ecological treatment of the sewage carbon, nitrogen and phosphorus removal.
Disclosure of Invention
The invention aims to provide An/O type composite HSSF-VSSF system capable of realizing synchronous decarburization and nitrogen and phosphorus removal aiming at low carbon-nitrogen ratio sewage treatment. The invention utilizes effluent backflow to connect a horizontal subsurface flow constructed wetland (HSSF) with stronger denitrification capability and a vertical subsurface flow constructed wetland (VSSF) with stronger nitrification capability in series. In a vertical subsurface flow constructed wetland (VSSF) system, the effective cooperation of aerobic Ammonia Oxidizing Bacteria (AOB), Nitrite Oxidizing Bacteria (NOB) and anaerobic ammonia oxidizing bacteria (Anammox) is realized by adjusting a substrate layer submerged area and a non-submerged area in an effluent water level control system, so that the ammonia nitrogen removal rate of the system is further improved. The substrate layer in the system is a composite substrate layer doped with oyster shell particles and broken bricks peculiar to coastal areas. The invention relates to a sewage treatment system with stable operation, high efficiency and low cost treatment performance.
The invention relates to a sewage treatment system consisting of a sedimentation tank, a horizontal subsurface flow constructed wetland (HSSF), a vertical subsurface flow constructed wetland (VSSF) and a reflux tank. The length-width ratio of a horizontal subsurface flow constructed wetland (HSSF) is 3: 1-2: 1, and a matrix layer is as follows from top to bottom: the river sand layer, the composite matrix layer (mixed oyster shell particles and crushed bricks) and the gravel layer are distributed on the horizontal subsurface flow constructed wetland (HSSF) by adopting perforated pipes, and the front end and the rear end of the horizontal subsurface flow constructed wetland are respectively filled with gravels to serve as a water distribution area and a water storage area. A guide plate is arranged among the water distribution area, the matrix packing layer and the water storage area to distribute water uniformly, and then the water is pushed to flow to the water outlet end of the wetland horizontally. A return pipe is arranged at the water inlet end of the horizontal subsurface flow constructed wetland (HSSF) and is connected with a return pump in the return tank. Herbaceous plants with strong oxygen secretion capability of root systems such as reeds and the like are planted in the wetland, and a part of nitrogen and phosphorus elements are removed through plant absorption. The height of the vertical subsurface flow constructed wetland (VSSF) is more than or equal to 60cm, the matrix packing layer is divided into three layers which are respectively as follows from top to bottom: river sand layer (mixed red soil and humus soil), multifunctional composite packing layer (mixed oyster shell particles, broken bricks and zeolite), gravel layer, vertical undercurrent constructed wetland (VSSF) is with the perforation pipe surface water distribution of evenly, the play water utilizes a water level control pipe, can build submergence district and non-submergence district in the matrix layer of vertical undercurrent constructed wetland (VSSF), utilize the synergistic effect of aerobic Ammonia Oxidizing Bacteria (AOB), anaerobic ammonia oxidizing bacteria (Anammox) and Nitrite Oxidizing Bacteria (NOB), richen systematic denitrogenation way. The reed is planted in the wetland, and partial nitrogen and phosphorus elements are removed through the plant absorption effect. The reflux pump is arranged in the reflux pool, and the effluent (nitrified liquid) of the vertical subsurface flow constructed wetland (VSSF) can be refluxed into the horizontal subsurface flow constructed wetland (HSSF) to strengthen the denitrification capability of the VSSF. The reflux ratio can be controlled by a reflux pump flow. Sewage and reflux nitrifying liquid are respectively pumped into a horizontal subsurface flow constructed wetland (HSSF) from a sedimentation tank and a reflux tank by a metering pump. In order to prevent the impact of the rainstorm on the system in rainy season, the system is provided with an overflow pipe, and when the rainstorm causes overlarge hydraulic load, sewage can directly flow away from the overflow pipe so as to protect the sewage treatment system from the impact.
During the operation of the equipment, some pollutant indexes such as COD, BOD and NH4 +-N、NO3 --N、NO2 --N、PO4 3-P, TN and TP can reflect the sewage treatment effect and running state of the invention, and the pollution removal condition and the change condition with the control condition can be judged from the macroscopic view by monitoring. NH (NH)4 +-N、NO3 --N、NO2 --N, TN and N2O can reflect the removal capacity and the migration and transformation path of nitrogen in the vertical subsurface flow constructed wetland (VSSF).
Compared with the prior art, the invention has the following advantages:
1. high nitrogen removal rate, low operation cost and no need of additional carbon source. In the operation process, the organic carbon source in the inflow water of the horizontal subsurface flow constructed wetland (HSSF) is subjected to denitrification, and the organic carbon source in the inflow water is fully utilized. The effluent water level regulating pipe in the system divides the wetland into an immersion area and a non-immersion area, part of ammonia nitrogen is converted into nitrate and nitrite respectively due to the difference of dissolved oxygen concentration (DO) in the wetland, and at the moment, most of the ammonia nitrogen is oxidized and removed by aerobic Ammonia Oxidizing Bacteria (AOB), Nitrite Oxidizing Bacteria (NOB) and anaerobic ammonia oxidizing bacteria (Anammox) through synergistic action. Therefore, the invention can reduce the consumption of the organic carbon source to a lower level, realizes the effective cooperation of the three functional microorganisms, greatly enhances the removal efficiency of ammonia nitrogen, does not need artificial aeration and greatly reduces the operating cost.
2. The phosphorus removal rate is high, and the abundance of microbial communities is high. According to the invention, the HSSF-VSSF system is provided with the composite matrix layers (mixed oyster shell particles, crushed bricks and zeolite), the matrix filler layers respectively contain higher Al, Fe and Ca elements, so that adsorption and precipitation removal of phosphorus in sewage are facilitated, the specific surface areas of the matrixes are larger, growth and attachment of microorganisms are facilitated, and the abundance of the microbial community is improved, so that the sewage treatment performance of the invention is improved.
3. The device has the advantages of simple structure, multifunction, high efficiency, low cost, easy operation and management, stable operation, synchronous carbon, nitrogen and phosphorus removal and the like, the treatment performance of the system is improved by recycling the effluent, the landscape effect is increased by planting wetland plants, and the device is combined with urban ecological construction and greening.
Drawings
Fig. 1 and 2 are plan and sectional views of the present invention.
Detailed Description
The details are shown in the attached figures 1-2 of the specification. In the operation process of the device, a water inlet pump pumps a substrate (low carbon nitrogen ratio sewage or high carbon nitrogen phosphorus sewage) in a sedimentation tank into a water inlet of a horizontal subsurface flow constructed wetland (HSSF), the effluent enters a vertical subsurface flow constructed wetland (VSSF) after horizontally flowing through a substrate layer, the effluent enters a reflux tank by utilizing an effluent water level regulating pipe, and the reflux pump refluxes the effluent to the horizontal subsurface flow constructed wetland (HSSF)
The invention comprises a sedimentation tank 1, a water outlet pump 2, a horizontal subsurface flow constructed wetland (HSSF)3, a vertical subsurface flow constructed wetland (VSSF)4, a reflux tank 5, a reflux pump 6, an overflow pipe 7 and a porous water sample collecting pipe 8.
The first embodiment is as follows:
the water outlet pump 2 pumps the water from the sedimentation tank 1 into a horizontal subsurface flow constructed wetland (HSSF)3 by utilizing a water outlet pipe 1-1, uniformly distributes the water to a water distribution area 3-2 through a water inlet pipe 3-1, then the water is guided by a guide plate 3-3 and enters a matrix layer 3-4, the water enters a vertical subsurface flow constructed wetland (VSSF)4 through a water outlet pipe 3-6 in a water storage area 3-5, the water is uniformly distributed by a surface water distribution pipe 4-1, flows through the matrix layer 4-2, then the water enters a reflux tank 5 through a water outlet water level adjusting pipe 4-4 in the water storage area 4-3, an unsaturated layer and a saturated layer can be created in a packing layer 4-2 in the vertical subsurface flow constructed wetland (VSSF)4, and the effective cooperation of three functional microorganisms of aerobic Ammonia Oxidizing Bacteria (AOB), Nitrite Oxidizing Bacteria (NOB) and anaerobic ammonia oxidizing bacteria (Anammox) is realized, enriches the way of removing the nitrogen in the system and greatly improves the efficiency of removing the ammonia nitrogen. The reflux liquid is pumped out by a reflux pump 6 through reflux pipes 3-7, and the effluent is refluxed to a horizontal subsurface flow constructed wetland (HSSF)3 for denitrification.
The second embodiment is as follows:
the embodiment is described with reference to fig. 1 and 2, the reflux pump 6 in the embodiment can adjust the amount of reflux liquid, control different reflux ratios of the system, optimize the denitrification capacity of the horizontal subsurface flow constructed wetland (HSSF)3, and fully utilize the organic carbon source in the inlet water, thereby further ensuring higher denitrification efficiency of the invention.
The third concrete implementation mode:
the embodiment is described by combining fig. 1 and fig. 2, the HSSF-VSSF system is filled with composite matrix layers 3-4 and 4-2 (broken bricks and oyster shell particles specific to coastal regions), so that high phosphorus and nitrogen removal rate is ensured, the specific surface area of the selected matrix is large, growth and attachment of microorganisms are facilitated, and the microbial community abundance of the system is greatly improved.
The fourth concrete implementation mode:
the embodiment is described by combining fig. 1 and fig. 2, and the overflow pipe 7 is added in the embodiment, so that when the system is subjected to heavy rain impact or large hydraulic load, the degree of impact on the system can be reduced by using the respective overflow pipes 7 in the sedimentation tank 1, the horizontal subsurface flow artificial wetland (HSSF)3, the vertical subsurface flow artificial wetland (VSSF)4 and the return tank 5, and the effective operation of the invention is ensured.
Claims (6)
1. An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio is characterized in that: the effluent of the sedimentation tank (1) is pumped into a horizontal subsurface flow constructed wetland HSSF (3) by a water outlet pump (2) through a water outlet pipe (1-1), is uniformly distributed in a water distribution area (3-2), is guided to a guide plate (3-3) to enter a matrix layer (3-4), is conveyed to a water distribution pipe (4-1) through a water outlet pipe (3-6) to uniformly distribute the water in a water storage area (3-5) and the vertical subsurface flow constructed wetland VSSF (4), and then flows into a reflux tank (5) in the water storage area (4-3) through the matrix layer (4-2) by utilizing a water level control valve (4-4) and is pumped into the horizontal subsurface flow constructed wetland HSSF (3) by a reflux pump (6) so as to perform denitrification.
2. The An/O composite type HSSF-VSSF system for enhanced treatment of sewage with low C/N ratio as claimed in claim 1, wherein a water level control valve (4-4) is provided at the VSSF (4) of the vertical subsurface flow constructed wetland, and the water level control valve (4-4) utilizes water level variation to create An immersed area and a non-immersed area in the same vertical space of the substrate layer (4-2) in the VSSF (4) of the vertical subsurface flow constructed wetland.
3. The An/O composite HSSF-VSSF system for strengthening treatment of low C/N ratio sewage as claimed in claim 1, wherein the reflux pump (6) can control the water outlet rate of the effluent reflux liquid to realize different effluent reflux ratios in the wetland.
4. The An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio as claimed in claim 1, wherein a water distribution area (3-2), a water storage area (3-5) and a guide plate (3-3) are provided in the horizontal subsurface flow constructed wetland, the sewage in the sedimentation tank (1) is pumped into the water distribution area (3-2) by the water inlet pump (2) through the water inlet pipe (3-1), and then the sewage is uniformly distributed on the sewage matrix layer (3-4) by the guide plate (3-3) and then is uniformly collected by the water storage area (3-5).
5. The An/O composite type HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio as claimed in claim 1, wherein composite matrix layers in horizontal subsurface flow constructed wetland HSSF (3) and vertical subsurface flow constructed wetland VSSF (4) are filled with crushed bricks (3-4) and oyster shell particles (4-2) peculiar to coastal areas respectively.
6. The An/O composite type HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio as claimed in claim 1, wherein An overflow pipe (7) is added, when the system is exposed to heavy rain impact or large hydraulic load, the anti-impact capability of the system can be reduced by using the respective overflow pipe (7) in the sedimentation tank (1), the horizontal subsurface flow constructed wetland HSSF (3), the vertical subsurface flow constructed wetland VSSF (4) and the return tank (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010981069.2A CN111995196A (en) | 2020-09-17 | 2020-09-17 | An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio |
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| CN202010981069.2A CN111995196A (en) | 2020-09-17 | 2020-09-17 | An/O composite HSSF-VSSF system for strengthening treatment of sewage with low C/N ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666504A (en) * | 2021-08-16 | 2021-11-19 | 天津大学 | Anaerobic/aerobic constructed wetland combined system and method for strengthening treatment of low C/N ratio sewage |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557330A (en) * | 2010-12-20 | 2012-07-11 | 中国科学院城市环境研究所 | An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater |
| US20190352204A1 (en) * | 2018-05-18 | 2019-11-21 | Energy Research Institute Of Jiangxi Academy Of Sciences | Siphon type composite vertical subsurface flow constructed wetland |
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- 2020-09-17 CN CN202010981069.2A patent/CN111995196A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557330A (en) * | 2010-12-20 | 2012-07-11 | 中国科学院城市环境研究所 | An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater |
| US20190352204A1 (en) * | 2018-05-18 | 2019-11-21 | Energy Research Institute Of Jiangxi Academy Of Sciences | Siphon type composite vertical subsurface flow constructed wetland |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666504A (en) * | 2021-08-16 | 2021-11-19 | 天津大学 | Anaerobic/aerobic constructed wetland combined system and method for strengthening treatment of low C/N ratio sewage |
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Application publication date: 20201127 |