AU2020103245A4 - A device for enhancing denitrification by combining a horizontal subsurface flow with a vertical flow CW-MFC system in series and an operation method thereof - Google Patents
A device for enhancing denitrification by combining a horizontal subsurface flow with a vertical flow CW-MFC system in series and an operation method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
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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
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a device for enhancing denitrification by combining a horizontal
subsurface flow with a vertical flow CW-MFC system in series and an operation method
thereof. According to the invention, sewage enters from the cathode and passes through
aerobic-anaerobic-aerobic environment, which is consistent with the oxygen environment
required by the denitrification process. Under the aerobic conditions provided by the cathode
region, nitrifying bacteria first convert nitrogen-containing organic matter into ammonia
nitrogen, and then further convert ammonia nitrogen into N02-N under the same conditions,
and the final product is N03-N. The sewage containing sufficient N03-N enters the anode
region under the action of hydraulic load and gravity, and is subjected to denitrification in
anaerobic environment, and finally N03-N is converted into nitrate. The invention can not only
strengthen the removal of nitrogen-containing organic matter, but also generate electric energy
to realize the resource utilization of sewage, which is conducive to energy conservation and
emission reduction.
1 /3
2
10
12 1
102 1510
103 1C 109
5 10410
13 - ~14 16
105 106 107
Figure 2 A front view of the device according to embodiment 1 of the present invention
105 106 107
10 1 _110
105 106 107
Figure 2 A top view of the device according to embodiment 1 of the present invention
Description
1 /3
2
10
12 1
102 1510
103 1C 109
510410
~14 16 13 - 105 106 107
Figure 2 A front view of the device according to embodiment 1 of the present invention
105 106 107
1 _110
105 106 107
Figure 2 A top view of the device according to embodiment 1 of the present invention
A device for enhancing denitrification by combining a horizontal subsurface flow
with a vertical flow CW-MFC system in series and an operation method thereof
[01] The invention belongs to the technical field of microbial fuel cells (MFC), and particularly relates to a device for enhancing nitrogen removal by combining horizontal subsurface flow with vertical flow CW-MFC system in series and an operation method thereof.
[02] At present, with the rapid development of industry, the accompanying environmental pollution has become increasingly serious, and the treatment of many industrial sewage has become a major problem, especially in the face of nitrogen containing sewage because the high-concentration nitrogen-containing sewage is extremely difficult to treat, and even if the final effluent reaches the standard, it still needs high treatment cost. The traditional treatment method occupies a large area, has low treatment efficiency and complicated process. The traditional way of sewage denitrification is usually AAO, which firstly needs to degrade the refractory substances in the sewage containing nitrogen, and then treat the sewage containing nitrogen by adding carbon source and refluxing. In this method, carbon source needs to be put in, and the cost of carbon source is high; reflux is needed, and a high proportion of reflux will easily affect the flora structure of the front section and make the dissolved oxygen in each section fluctuate, which will further affect the state of the anaerobic tank. It is necessary to set up a high-power aeration device with high energy consumption. At the same time, pipeline blockage or flow dead zone is easy to occur in each reaction tank, resulting in poor operating conditions.
[03] Constructed wetland (CW) is a sewage treatment technology which is constructed and controlled by man and has similar functions to natural wetland. When the sewage is added to the constructed wetland, it treats the sewage mainly by utilizing artificial filling medium and attached microorganisms, absorption of plant roots and physical, chemical and biological synergistic effects of rhizosphere microorganisms when the sewage flows through the wetland in a certain direction. Its action mechanism includes adsorption, retention, filtration, redox, precipitation, microbial decomposition, transformation, plant shelter, residue accumulation, transpiration water and nutrient absorption, and the action of various animals. It is a comprehensive artificial enhanced ecological treatment system, which applies the principle of species symbiosis, material recycling and the principle of coordination between structure and function in the ecosystem to promote the ecological process of interception, adsorption, accumulation and biodegradation of pollutants in sewage. Constructed wetland has become one of the sewage treatment technologies with good application prospects due to its advantages of good sewage treatment effect, strong nitrogen and phosphorus removal capacity, low cost and strong adaptability to load changes. Constructed wetlands can be divided into surface flow, horizontal undercurrent and vertical undercurrent, among which vertical undercurrent constructed wetlands have attracted much attention because of their strong oxygen transport capacity, good hydraulic load and good pollutant removal effect in any season. Vertical upward flow and vertical downward flow are the two most common forms of vertical flow constructed wetlands. The surface flow constructed wetland has the advantages of simple structure, low operation cost, and can reduce water pollution in a certain range. However, it covers a large area and is easy to breed mosquitoes and flies in long-term contact with the air. Subsurface flow constructed wetland is divided into horizontal subsurface flow and vertical subsurface flow, and its construction and operation cost are higher than those of surface flow constructed wetland, but its ability to treat nitrogen-containing pollutants has been improved. The aerobic condition in the upper layer of the vertical flow constructed wetland is in contact with the air, which makes its nitrification better, while the horizontal flow constructed wetland provides a living environment for anaerobic microorganisms or facultative anaerobic microorganisms, which makes its denitrification better. However, the simple constructed wetland cannot provide aerobic and anaerobic environment at the same time so that the removal of nitrogen and phosphorus is difficult to reach a higher level. Composite constructed wetland can make the advantages of simple constructed wetland complement each other, so as to enhance the purification effect of sewage. Composite vertical flow constructed wetland is close to mesophytic environment in most areas, which is suitable for the growth of more plant species, and thus has better sewage treatment effect.
[04] Microbial fuel cell coupled constructed wetland system, as a new sewage treatment process, can improve the sewage treatment effect and generate electric energy synchronously. Compared with the simple constructed wetland, it can reduce greenhouse gas emissions and also and take into account the advantages of simple structure, low treatment cost and beautiful appearance, so as to realize the resource utilization of sewage. The anaerobic region at the bottom of simple vertical flow constructed wetland is the anode of microbial fuel cell, and the aerobic region in contact with air at the upper layer is the cathode of microbial fuel cell. During the denitrification operation, the water is fed from the cathode and discharged from the anode. The nitrogen-containing organic matter is converted into nitrate nitrogen by nitrification in the cathode aerobic region, and then reduced to nitrogen by denitrification in the anode anaerobic region. However, the effluent after anaerobic treatment will remain more organic matter and emit odour, which will pollute the surrounding air.
[05] Although the existing combined constructed wetland system can meet the oxygen demand of nitrification to a certain extent and achieve denitrification of nitrate nitrogen through reflux device. However, it is only limited to the horizontal structure of aeration device and reflux device, and the site utilization rate is not high, the sewage treatment efficiency is low, the energy consumption is high, so that the device operation is not economic enough, and it is easy to form odour secondary pollution. Without considering the recycling treatment, when the sewage impact load, the pollutant concentration may exceed the standard.
[06] The purpose of the present invention is to provide a device for improving nitrogen removal efficiency by coupling microbial fuel cell with U-shaped constructed wetland and an operation method thereof, aiming at the problems of large occupied area, long construction period, high investment cost, increased emission of greenhouse gas (methane), poor removal effect of nitrogen and phosphorus elements and the like of the constructed wetland technology in the prior art. The organic matter and total nitrogen in sewage are effectively removed through triple treatment provided by horizontal subsurface flow and vertical flow constructed wetland in series. Meanwhile, it can further reduce nitrogen and phosphorus content in effluent, reduce methane emission in wetland, prevent water pollution from being transferred to air pollution, and generate clean energy-electric energy. On the premise of achieving the best removal effect, it can control operating conditions and reduce energy consumption and construction cost.
[07] The technical scheme adopted by the invention is as follows:
[08] A device of microbial fuel cell coupled U-shaped constructed wetland is comprised of a vertical flow constructed wetland A, a horizontal flow constructed wetland B and a vertical flow constructed wetland C which are arranged in a U-shape, wherein the height of the vertical flow constructed wetland C is lower than that of A. The vertical flow constructed wetland A comprises an inlet water distribution area, a cathode I region, a vertical flow substrate layer I and an anode I region in sequence from top to bottom. The vertical flow constructed wetland C comprises an outlet water collecting area, a cathode II region, a vertical flow substrate layer II and an anode II region in sequence from top to bottom. The horizontal flow constructed wetland B is a horizontal flow substrate layer horizontally set, which is respectively connected with anode I region and anode II region. The cathode I region and anode I region are electrically connected with electrical appliance I, and the cathode II region and anode II region are electrically connected with electrical appliance II.
[09] Further, the inlet water distribution area is provided with a water inlet, and the outlet water collecting area is provided with a water outlet.
[010] Further, the cathode I region is provided with an activated carbon material for inoculating nitrifying exoelectrogens.
[011] Further, the outer layer of the activated carbon material is wrapped with a metal mesh layer and is electrically connected with the electrical appliance I.
[012] Further, the anode I region is provided with an activated carbon material for inoculating denitrifying bacteria.
[013] Further, the outer layer of the activated carbon material is wrapped with a metal mesh layer and t is electrically connected with the electrical appliance I.
[014] Further, the vertical flow substrate layer I, horizontal flow substrate layer, vertical flow substrate layer II, cathode II region and anode II region are filled with quartz sand or clinoptilolite.
[015] Further, the cathode I region, the vertical flow substrate layer I and the anode I region are also filled with at least one of quartz sand, anthracite, zeolite and ceramsite.
[016] Further, the inlet water distribution area is provided with an aeration device.
[017] The operation method of the microbial fuel cell coupled constructed wetland U-shaped device specifically comprises the following steps.
[018] Sewage flows into the inlet water distribution area from the water inlet, and then uniformly seeps to the cathode I region of the vertical flow constructed wetland A. Nitrogen-containing organic matter in sewage is transformed from NH4-N to N02-N and then to N03-N under the action of exoelectrogens enriched in cathode I region and oxygen, and electrons are released in the process. Then, the sewage flows through the vertical flow substrate layer I to reach the anode I region in the anoxic environment. The anaerobic denitrifying bacteria in the anode I region reduce N02-N and N03-N to obtain the product N2, and receive the electrons transferred from the cathode I region. Sewage continues to flow in horizontal flow constructed wetland B, so that nitrate nitrogen is fully denitrified. The sewage after denitrification flows from bottom to top in the vertical flow constructed wetland C driven by the liquid level difference of U shaped pipe, and the odour generated by anaerobic reaction and residual small molecular organic matters in the sewage are removed through the cathode II region. Finally, in the outlet water collecting area, the liquid layer reaches the height of the water outlet and then the sewage is discharged.
[019] The inlet water distribution area of the vertical flow constructed wetland A is connected with a water supply system, and the external circuits of the cathode and anode are connected with the general electric appliance I. Nitrifying bacteria firstly convert nitrogen-containing organic matters into ammonia nitrogen under aerobic conditions provided by the cathode region, and further convert ammonia nitrogen into N02-N under the same conditions, and the final product is N3-N. Sewage containing
sufficient N03-N enters the anode region under the action of hydraulic load and gravity, and carries out denitrification process in anaerobic environment. Horizontal flow constructed wetland B is completely in anaerobic environment, and N03-N flowing through it receives electrons transmitted from cathode region and is reduced to N2 by denitrifying bacteria without adding carbon source. As the height of the vertical flow constructed wetland C is lower than that of the vertical flow constructed wetland A, referring to the U-tube principle, the sewage after denitrification flows to the water outlet from bottom to top, and the sewage can be discharged smoothly in aerobic environment without emitting malodourous odour.
[020] To sum up, due to the adoption of above technical scheme, the invention has the following beneficial effects.
[021] According to the invention, a vertical flow-horizontal flow-vertical flow composite constructed wetland coupled microbial fuel cell sewage denitrification system is adopted, and the whole process can be successfully completed without adding a pump at the water outlet by combining the U-shaped pipe principle, so that the energy consumption is low, and the environment in which sewage flows in the device coincides with the environment required by the nitrogen removal process, thereby the whole process is subtly realized. After anaerobic denitrification treatment in horizontal flow device, sewage is not directly discharged, but goes to another aerobic process to realize better denitrification and COD removal efficiency, which improves the odour problem caused by direct effluent after anaerobic. According to the invention, nitrogen containing organic matters can be removed, and electric energy can be generated at the same time, thus realizing the resource utilization of sewage and being beneficial to energy conservation and emission reduction.
[022] In order to explain the technical scheme of the embodiments of the present invention more clearly, the following figures which need to be used in the embodiments will be briefly introduced. It should be understood that the following figures only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For ordinary technicians in the field, other related figures can be obtained according to these without paying creative labour.
[023] Figure 1 is a front view of the device according to embodiment 1 of the present invention.
[024] Figure 2 is a top view of the device according to embodiment 1 of the present invention.
[025] Figure 3 is a left side view of the device according to embodiment 1 of the present invention.
[026] Figure 4 is a front view of the device according to embodiment 2 of the present invention.
[027] Figure 5 is a top view of the device according to embodiment 2 of the present invention.
[028] Figure 6 is a left side view of the device according to embodiment 2 of the present invention.
In figures, 1- water inlet, 2- inlet water distribution area, 3- cathode I region, 4- vertical flow substrate layer I, 5- anode I region, 6- horizontal flow substrate layer, 7- anode II region, 8- vertical flow substrate layer II, 9- cathode II region, 10- outlet water collecting area, 11- water outlet, 12- wire I, 13- electrical appliance 1,14- wire11,15 wire 111,16- electrical appliance 11,17- wire IV.
[029] In order to make the object, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail with reference to the figures and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the figures herein may be arranged and designed in various different configurations.
[030] Therefore, the following detailed description of the embodiments of the invention provided in the figures is not intended to limit the scope of the claimed invention, but only represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative labour should belong to the protection scope of the present invention.
[031] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "including", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or equipment. In the absence of further restrictions, the statement such as "includes a..." is a defined element, but it does not exclude the existence of other identical elements in
the process, method, article or equipment including the element.
[032] . The characteristics and performance of the present invention will be further described in detail with embodiments below.
[033] Embodiment 1
[034] The u-shaped device of microbial fuel cell coupled constructed wetland provided by the preferred embodiment of the invention comprises a vertical flow constructed wetland A, a horizontal flow constructed wetland B and a vertical flow constructed wetland C which are arranged in a U-shape, wherein the height of the vertical flow constructed wetland C is lower than that of the vertical flow constructed wetland A. The vertical flow constructed wetland A is sequentially provided with an inlet water distribution area (2), a cathode I region (3), a vertical flow substrate layer I (4) and an anode I region (5) from top to bottom. The vertical flow constructed wetland C comprises an outlet water collecting area (10), a cathode II region (9), a vertical flow substrate layer 11 (8) and an anode II region (7) in sequence from top to bottom. The horizontal flow constructed wetland B is a horizontal flow substrate layer (6) horizontally set, which is respectively connected with anode I region (5) and anode II region (7). The cathode I region (3) and anode I region (5) are electrically connected with electrical appliance 1 (13), and the cathode II region (9) and anode II region (7) are electrically connected with electrical appliance 11 (16). The inlet water distribution area (2) is provided with a water inlet (1), and the outlet water collecting area (10) is provided with a water outlet (11), which are connected with cathode I region (3), anode I region (5) and electrical appliance I (13) through wires I (12) and 11 (14), and connected with anode II region (7), cathode II region (9) and external electrical appliance 11(16) through wires III (15) and IV (17).
[035] The electricity generating sections of the device are the cathode I region (3) and anode I region (5) of the vertical flow constructed wetland A. When the sewage is treated, the sewage flows into the inlet water distribution area (2) from the water inlet (1) under the action of the peristaltic pump. After reaching a certain depth, the sewage evenly seeps into the cathode I region (3) of the vertical flow constructed wetland A. The nitrogen-containing organic compounds in the sewage can be converted from NH4 N into N02-N into N03-N under the action of oxygen and exoelectrogens enriched on the activated carbon of the cathode I region (3) and releasing electrons in the process. Then the sewage flows through the vertical flow substrate layer I (4) to reach anode I region (5) in anoxic environment. The activated carbon layer of anode I region (5) enriches denitrifying bacteria and receives electrons from cathode I region (3). Electrical appliance I (13) can speed up the flow of electrons and make anaerobic denitrifying bacteria reduce N02-N and N03-N to obtain product N2. The sewage continues to flow in horizontal flow constructed wetland B, so that nitrate nitrogen is fully denitrified. After denitrification, the sewage flows from bottom to top in vertical flow constructed wetland C, and the odour produced by anaerobic reaction is removed by cathode II region (9). Finally, in outlet water collecting area (10), the liquid layer reaches the height of water outlet (11), and the sewage is discharged smoothly.
[036] In this embodiment, the device is made of acrylic material with a wall thickness of 0.6cm, and the diameter of the bottom surface of the inlet water distribution area (2) is 34cm and the height is 5 cm. The total size of cathode I region (3), vertical flow substrate layer 1 (4) and anode I region (5) of vertical flow constructed wetland A is 30cm in bottom diameter and 80cm in height. The horizontal flow substrate layer (6) is a cylinder with a diameter of 30cm and length of 40cm. The total dimensions of cathode II region (9), vertical flow substrate layer 11 (8) and anode II region (7) are cm in diameter and 60cm in height.
[037] The vertical flow constructed wetland A, the horizontal flow constructed wetland B and vertical flow constructed wetland C of the device in the embodiment are all cylindrical. Compared with the square cross-section device with the same consumables, the biochemical reaction area of the circular cross-section device is larger, and the contact between sewage and substrate is more sufficient. Because the area of circular cross-section is larger than that of rectangular section under the same circumference, the reaction column with the same height can accommodate more materials at one time. According to the balance principle of hydrostatics and the basic principle of measuring pressure by liquid column manometer, the flow velocity of sewage treatment in circular section device will be improved to a certain extent. In addition, the inner and outer walls of the circular section device are smooth, and it is not easy to scrape and grind, and the circular device is conducive to evenly distributing the pressure, so that it cannot be damaged. Compared with square cross-section device, the daily cleaning of circular cross-section device is more convenient. The concave angle inside the square section device is usually difficult to clean, and it is easy to deposit after a long time of use, which eventually leads to the bacterial community being polluted by the things attached to the sediment. In addition, compared with the square device with the same floor area, the circular cross-section device with the same amount of consumables has a larger height difference than the rectangular cross-section device, and the inlet and outlet water is not easy to become a short flow, which effectively avoids the stagnant water in the local area of the device.
[038] Wherein, the cathode I region (3) is provided with activated carbon materials for inoculating nitrifying exoelectrogens. The metal mesh layer is wrapped on the outer layer of activated carbon material, which is electrically connected with the electrical appliance 1 (13), so that it becomes the electrode of the cathode I region (3). The circuit is communicated through the external cable, and the load is connected on the external cable. Other treatment methods are the same as those in the embodiment 1. This device enables denitrification and electricity generation to be carried out simultaneously.
[039] Wherein, the anode I region (5) is provided with activated carbon materials for inoculating denitrifying bacteria. The metal mesh layer is wrapped on the outer layer of activated carbon material, which is electrically connected with the electrical appliance 1 (13), so that it becomes the electrode of the anode I region (5). The circuit is communicated through the external cable, and the load is connected on the external cable. Other treatment methods are the same as those in the embodiment 1. This device enables denitrification and electricity generation to be carried out simultaneously.
[040] Wherein, the vertical flow substrate layer I (4), horizontal flow substrate layer (6), vertical flow substrate layer 11 (8), cathode II region (9) and anode II region (7) are filled with quartz sand or clinoptilolite. The cathode I region (3), the vertical flow substrate layer I (4) and the anode I region (5) are also filled with at least one of quartz sand, anthracite, zeolite and ceramsite. Through the ion exchange of these substrates, the removal of nitrogen is improved, and more electron acceptors are provided for the power generation section, so as to improve the power generation.
[041] Wherein, the inlet water distribution area (2) is provided with an aeration device, which makes the nitrification process more thorough and provides more electron acceptors for anaerobic denitrification reaction, so as to improve the power generation.
[042] Wherein, the device is provided with a plurality of sampling ports numbered 101, 102, 103, 104, 105, 106, 107, 108, 109 and 110 respectively. Two sampling ports oppositely arranged on both sides of the horizontal flow constructed wetland B have the same number. The sampling port is a hollow cylinder with an opening diameter of 0.5cm. Through sampling points, water samples can be collected at different stages and positions in the treatment process for detection.
[043] Embodiment 2
[044] The u-shaped device of microbial fuel cell coupled constructed wetland provided by the preferred embodiment of the invention comprises a vertical flow constructed wetland A, a horizontal flow constructed wetland B and a vertical flow constructed wetland C which are arranged in a U-shape, wherein the height of the vertical flow constructed wetland C is lower than that of the vertical flow constructed wetland A. The vertical flow constructed wetland A is sequentially provided with an inlet water distribution area (2), a cathode I region (3), a vertical flow substrate layer I (4) and an anode I region (5) from top to bottom. The vertical flow constructed wetland C comprises an outlet water collecting area (10), a cathode II region (9), a vertical flow substrate layer 11 (8) and an anode II region (7) in sequence from top to bottom. The horizontal flow constructed wetland B is a horizontal flow substrate layer (6) horizontally set, which is respectively connected with anode I region (5) and anode II region (7). The cathode I region (3) and anode I region (5) are electrically connected with electrical appliance 1 (13), and the cathode II region (9) and anode II region (7) are electrically connected with electrical appliance 11 (16). The inlet water distribution area (2) is provided with a water inlet (1), and the outlet water collecting area (10) is provided with a water outlet (11), which are connected with cathode I region (3), anode I region (5) and electrical appliance I (13) through wires I (12) and 11 (14), and connected with anode II region (7), cathode II region (9) and external electrical appliance 11(16) through wires III (15) and IV (17).
[045] The electricity generating sections of the device are the cathode I region (3) and anode I region (5) of the vertical flow constructed wetland A. When the sewage is treated, the sewage flows into the inlet water distribution area (2) from the water inlet (1) under the action of the peristaltic pump. After reaching a certain depth, the sewage evenly seeps into the cathode I region (3) of the vertical flow constructed wetland A. The nitrogen-containing organic compounds in the sewage can be converted from NH4 N into N02-N into N03-N under the action of oxygen and exoelectrogens enriched on the activated carbon of the cathode I region (3) and releasing electrons in the process. Then the sewage flows through the vertical flow substrate layer I (4) to reach anode I region (5) in anoxic environment. The activated carbon layer of anode I region (5) enriches denitrifying bacteria and receives electrons from cathode I region (3). Electrical appliance I (13) can speed up the flow of electrons and make anaerobic denitrifying bacteria reduce N02-N and N03-N to obtain product N2. The sewage continues to flow in horizontal flow constructed wetland B, so that nitrate nitrogen is fully denitrified. After denitrification, the sewage flows from bottom to top in vertical flow constructed wetland C, and the odour produced by anaerobic reaction is removed by cathode II region (9). Finally, in outlet water collecting area (10), the liquid layer reaches the height of water outlet (11), and the sewage is discharged smoothly.
[046] In this embodiment, the device is made of acrylic material with a wall thickness of 0.6cm, and the measurements of the inlet water distribution area (2) is 32 cm*54 cm*5 cm. The total size of cathode I region (3), vertical flow substrate layer I (4) is 30 cm*50 cm*50 cm. The total size of
[047] anode I region (5), horizontal flow substrate layer (6) and anode II region (7) in horizontal flow constructed wetland B is 100 cm*50 cm*20 cm, and that of vertical flow substrate layer 11 (8) and cathode II region (9) of vertical flow constructed wetland C is 30 cm*50 cm*30 cm.
[048] The vertical flow constructed wetland A, the horizontal flow constructed wetland B and vertical flow constructed wetland C of the device in the embodiment are all cylindrical. Compared with the square cross-section device with the same consumables, the biochemical reaction area of the circular cross-section device is larger, and the contact between sewage and substrate is more sufficient. Because the area of circular cross-section is larger than that of rectangular section under the same circumference, the reaction column with the same height can accommodate more materials at one time. According to the balance principle of hydrostatics and the basic principle of measuring pressure by liquid column manometer, the flow velocity of sewage treatment in circular section device will be improved to a certain extent. In addition, the inner and outer walls of the circular section device are smooth, and it is not easy to scrape and grind, and the circular device is conducive to evenly distributing the pressure, so that it cannot be damaged. Compared with square cross-section device, the daily cleaning of circular cross-section device is more convenient. The concave angle inside the square section device is usually difficult to clean, and it is easy to deposit after a long time of use, which eventually leads to the bacterial community being polluted by the things attached to the sediment. In addition, compared with the square device with the same floor area, the circular cross-section device with the same amount of consumables has a larger height difference than the rectangular cross-section device, and the inlet and outlet water is not easy to become a short flow, which effectively avoids the stagnant water in the local area of the device.
[049] Wherein, the cathode I region (3) is provided with activated carbon materials for inoculating nitrifying exoelectrogens. The metal mesh layer is wrapped on the outer layer of activated carbon material, which is electrically connected with the electrical appliance I (13), so that it becomes the electrode of the cathode I region (3). The circuit is communicated through the external cable, and the load is connected on the external cable. Other treatment methods are the same as those in the embodiment 1. This device enables denitrification and electricity generation to be carried out simultaneously.
[050] Wherein, the anode I region (5) is provided with activated carbon materials for inoculating denitrifying bacteria. The metal mesh layer is wrapped on the outer layer of activated carbon material, which is electrically connected with the electrical appliance 1 (13), so that it becomes the electrode of the anode I region (5). The circuit is communicated through the external cable, and the load is connected on the external cable. Other treatment methods are the same as those in the embodiment 1. This device enables denitrification and electricity generation to be carried out simultaneously.
[051] Wherein, the vertical flow substrate layer I (4), horizontal flow substrate layer (6), vertical flow substrate layer 11 (8), cathode II region (9) and anode II region (7) are filled with quartz sand or clinoptilolite. The cathode I region (3), the vertical flow substrate layer I (4) and the anode I region (5) are also filled with at least one of quartz sand, anthracite, zeolite and ceramsite. Through the ion exchange of these substrates, the removal of nitrogen is improved, and more electron acceptors are provided for the power generation section, so as to improve the power generation.
[052] Wherein, the inlet water distribution area (2) is provided with an aeration device, which makes the nitrification process more thorough and provides more electron acceptors for anaerobic denitrification reaction, so as to improve the power generation.
[053] Wherein, the device is provided with a plurality of sampling ports numbered 101, 102, 103, 104, 105, 106, 107, 108, 109 and110 respectively. The labels of sampling ports on the same horizontal plane on vertical flow constructed wetland A are the same, those on the same horizontal plane on vertical flow constructed wetland C are the same, and the two sampling ports on both sides of horizontal flow constructed wetland B are the same. The sampling port is a hollow cylinder with an opening diameter of 0.5cm. Through sampling points, water samples can be collected at different stages and positions in the treatment process for detection.
[054] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.
[055] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable
Claims (10)
1. A device for enhancing denitrification by combining a horizontal subsurface flow with a vertical flow CW-MFC system in series is characterized by comprising a vertical flow constructed wetland A, a horizontal flow constructed wetland B and a vertical flow constructed wetland C which are arranged in a U-shape, wherein the height of the vertical flow constructed wetland C is lower than that of A. The vertical flow constructed wetland A comprises an inlet water distribution area (2), a cathode I region (3), a vertical flow substrate layer I (4) and an anode I region (5) in sequence from top to bottom. The vertical flow constructed wetland C comprises an outlet water collecting area (10), a cathode II region (9), a vertical flow substrate layer 11 (8) and an anode II region (7) in sequence from top to bottom. The horizontal flow constructed wetland B is a horizontal flow substrate layer (6) horizontally set, which is respectively connected with anode I region (5) and anode II region (7). The cathode I region (3) and anode I region (5) are electrically connected with electrical appliance 1 (13), and the cathode II region (9) and anode II region (7) are electrically connected with electrical appliance II (16).
2. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 1 is characterized in that the inlet water distribution area (2) is provided with a water inlet (1), and the outlet water collecting area (10) is provided with a water outlet (11).
3. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 1 is characterized in that the cathode I region (3) is provided with an activated carbon material for inoculating nitrifying exoelectrogens.
4. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 3 is characterized in that the outer layer of the activated carbon material is wrapped with a metal mesh layer and is electrically connected with the electrical appliance 1 (13).
5. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 1 is characterized in that the anode I region (5) is provided with an activated carbon material for inoculating denitrifying bacteria.
6. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 5 is characterized in that the outer layer of the activated carbon material is wrapped with a metal mesh layer and t is electrically connected with the electrical appliance 1 (13).
7. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 1 is characterized in that the vertical flow substrate layer I (4), horizontal flow substrate layer (6), vertical flow substrate layer 11 (8), cathode II region (9) and anode II region (7) are filled with quartz sand or clinoptilolite.
8. The device of microbial fuel cell coupled U-shaped constructed wetland according to any claims of 3, 5 and 7, is characterized in that the cathode I region (3), the vertical flow substrate layer I (4) and the anode I region (5) are also filled with at least one of quartz sand, anthracite, zeolite and ceramsite.
9. The device of microbial fuel cell coupled U-shaped constructed wetland according to claim 1 is characterized in that the inlet water distribution area (2) is provided with an aeration device.
10. The operation method of the device with microbial fuel cell coupled U-shaped constructed wetland according to any one of claims 1-9 is characterized in that sewage flows into the inlet water distribution area (2) from the water inlet (1), and then uniformly seeps to the cathode I region (3) of the vertical flow constructed wetland A. Nitrogen-containing organic matter in sewage is transformed from NH4-N to N02-N and then to N03-N under the action of exoelectrogens enriched in cathode I region (3) and oxygen, and electrons are released in the process. Then, the sewage flows through the vertical flow substrate layer I (4) to reach the anode I region (5) in the anoxic environment. The anaerobic denitrifying bacteria in the anode I region (5) reduce N02 N and N03-N to obtain the product N2, and receive the electrons transferred from the cathode I region (3). Sewage continues to flow in horizontal flow constructed wetland B, so that nitrate nitrogen is fully denitrified. The sewage after denitrification flows from bottom to top in the vertical flow constructed wetland C driven by the liquid level difference of U-shaped pipe, and the odour generated by anaerobic reaction and residual small molecular organic matters in the sewage are removed through the cathode II region (9). Finally, in the outlet water collecting area (10), the liquid layer reaches the height of the water outlet and then the sewage is discharged.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023838A (en) * | 2021-04-01 | 2021-06-25 | 浙江大学衢州研究院 | Device and method for enhancing deep nitrogen and phosphorus removal of constructed wetland by electrochemical coupling of pyrite |
| CN113540542A (en) * | 2021-07-27 | 2021-10-22 | 桂林理工大学 | Microbial battery for constructed wetland |
| CN115215446A (en) * | 2022-07-29 | 2022-10-21 | 江苏河马井股份有限公司 | Method for treating sewage by adding hydrogen peroxide |
| CN116495889A (en) * | 2023-04-21 | 2023-07-28 | 北京泷涛环境科技有限公司 | Constructed wetland treatment system and treatment method for enhanced denitrification |
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2020
- 2020-11-05 AU AU2020103245A patent/AU2020103245A4/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113023838A (en) * | 2021-04-01 | 2021-06-25 | 浙江大学衢州研究院 | Device and method for enhancing deep nitrogen and phosphorus removal of constructed wetland by electrochemical coupling of pyrite |
| CN113540542A (en) * | 2021-07-27 | 2021-10-22 | 桂林理工大学 | Microbial battery for constructed wetland |
| CN113540542B (en) * | 2021-07-27 | 2023-03-24 | 桂林理工大学 | Microbial battery for constructed wetland |
| CN115215446A (en) * | 2022-07-29 | 2022-10-21 | 江苏河马井股份有限公司 | Method for treating sewage by adding hydrogen peroxide |
| CN116495889A (en) * | 2023-04-21 | 2023-07-28 | 北京泷涛环境科技有限公司 | Constructed wetland treatment system and treatment method for enhanced denitrification |
| CN116495889B (en) * | 2023-04-21 | 2023-10-13 | 北京泷涛环境科技有限公司 | Constructed wetland treatment system and treatment method for enhanced denitrification |
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