CN114368841A - Quick-start MEC-type downward vertical-flow constructed wetland decarbonization and denitrification device and method for microbial electrolysis cell - Google Patents
Quick-start MEC-type downward vertical-flow constructed wetland decarbonization and denitrification device and method for microbial electrolysis cell Download PDFInfo
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Abstract
The invention discloses a device and a method for decarbonizing and denitrifying by using a quick-start MEC-type downward vertical flow constructed wetland, which comprises an constructed wetland pool body, a top water distribution pipe, a top non-conductive packing layer, an anode conductive packing layer, an artificial strain introducing pipe, an exhaust pipe, a non-conductive packing isolation layer, a cathode conductive packing layer, an artificial strain introducing pipe, an exhaust pipe, a bottom non-conductive packing layer and a water outlet pipe are paved in the artificial wetland tank body from top to bottom, the anode conductive filler layer in the artificial wetland tank body is respectively connected with the top non-conductive filler layer and the non-conductive filler isolation layer, the cathode conductive filler layer is respectively connected with the bottom non-conductive filler layer and the non-conductive filler isolation layer, the device is simple to operate, and when the wastewater containing refractory organic matters and nitrogen-containing compounds (C/N is less than 3) is treated, the COD (chemical oxygen demand) and the total nitrogen content of effluent are greatly reduced. Compared with the conventional downward vertical flow constructed wetland coupling microorganism electrolytic cell device, the removal rate is improved by 15-25%.
Description
Technical Field
The invention relates to the technical field of constructed wetland water treatment environment engineering, in particular to a quick-start MEC-type downward vertical flow constructed wetland decarbonization and denitrification device and method for a microbial electrolysis cell.
Background
Various pesticides and nitrogen fertilizers can be inevitably used in the agricultural production process, and the pollution of residual pesticides and nitrogen fertilizers is formed after the pesticides enter the water body under the action of the rainwater surface runoff, so that the COD (chemical oxygen demand) and nitrogen content in the water body are higher, and the water quality of the water body is easily deteriorated and even a black and odorous water body is formed. At present, organic pollutants, especially pesticide residue components in Chinese water have poor biodegradability, and the water has the characteristic of low C/N ratio due to high nitrogen content, so that the organic pollutants and especially the pesticide residue components are difficult to remove through the self-purification capacity of the water. In actual engineering, in order to achieve efficient removal of nitrogen, low C/N ratio sewage is generally added with organic matters such as methanol or glucose, so that limited resources are consumed, the operation and maintenance cost is increased, and the method is not suitable for being applied to the field of large-area water body treatment.
The artificial wetland is a constructed and regulated wetland system, performs purification treatment on water through optimized combination of physical, chemical and biological effects in an ecological system, has the advantages of low construction and operation cost, simple maintenance, wide application range and the like, and is suitable for the field of large-area water treatment. The artificial wetland generally consists of a substrate and aquatic plants growing on the substrate to form a substrate-microorganism-plant ecological system, and pollutants are absorbed, converted or decomposed by the system when water flows through the system, so that the aim of removing the pollutants is fulfilled. However, when organic matters with poor biodegradability exist in water, COD cannot be effectively reduced, nitrogen removal is mainly carried out through plant absorption, and the function of microorganism denitrification cannot be exerted, so that the operation efficiency of the constructed wetland is poor.
The bioelectrochemical system has attracted more and more attention in recent years as a completely new biological treatment technology. The system uses micro-organisms adsorbed on 1 or 2 electrodes to catalyse the oxidation of the bioanode and the reduction of the biocathode, including microbial fuel cells MFC and microbial electrolysers MEC. Compared with MFC, MEC can control electrochemical parameters of reaction and microorganism living environment more accurately and effectively due to the existence of external power source, thereby showing more outstanding advantages in thermodynamic and kinetic performance of reaction. In MECs, the electrochemically active microorganisms at the anode oxidize the substrate and release electrons to the anode, which travel through a circuit of applied voltage to the cathode where they bind to electron acceptors and undergo a reduction reaction. The current research shows that MEC, as a wastewater biological treatment technology, can achieve ideal treatment effect on common organic and inorganic pollutants and refractory substances, and can greatly reduce energy consumption. Therefore, the MEC and the artificial wetland technology are combined, and the method has good feasibility and good application prospect in the aspect of removing the COD which is difficult to degrade and inorganic nitrogen.
Chinese patents CN105236584B and CN103466801B propose that MEC is coupled to constructed wetland for enhanced denitrification removal in water, which has certain effect in denitrification, but: (1) because the formation of microorganisms around the electrodes of the water-cooled generator needs to be naturally formed by nutrient substances in the water body, the starting period is longer due to the slower forming speed; (2) gas such as nitrogen generated in the denitrification process naturally overflows through pores in the artificial wetland, and unsmooth airflow can be caused in the small pores to cause the pressure building of the cell body, so that the denitrification reaction can not be normally carried out, and the potential risk of the cell body damage can be caused; (3) the application of the cathode denitrification capability is only carried out, and the effect of anodizing refractory organic matters is not applied. In order to solve the problems, the technology is optimized, and the quick start of the MEC type constructed wetland of the microbial electrolysis cell is realized while the removal of refractory organic matters and nitrogen in the water body is ensured.
Disclosure of Invention
The invention aims to provide a device and a method for decarbonizing and denitrifying a microorganism electrolytic cell MEC type downward vertical flow artificial wetland, which are quickly started, so as to solve the problems that the prior artificial wetland denitrification device needs to naturally form microorganisms around the electrode by nutrient substances in a water body, and the starting period is long due to slow forming speed; (2) gas such as nitrogen generated in the denitrification process naturally overflows through pores in the artificial wetland, and unsmooth airflow can be caused in the small pores to cause the pressure building of the cell body, so that the denitrification reaction can not be normally carried out, and the potential risk of the cell body damage can be caused; (3) the invention optimizes the technology to solve the technical problems that the effect of oxidizing the refractory organic matters by the anode is not applied and the like only by applying the denitrification capability of the cathode, and realizes the quick start of the MEC type artificial wetland of the microbial electrolysis cell while ensuring the removal of the refractory organic matters and nitrogen in the water body.
The invention aims to provide a quick-start MEC-type downward vertical flow constructed wetland decarburization and denitrification method for a microbial electrolysis cell, which is simple and feasible, is easy to operate, and can quickly and efficiently remove organic matters which are difficult to degrade in a water body and nitrogen with a low C/N ratio.
The invention also aims to provide a quick-start MEC-type downward vertical flow constructed wetland decarbonization and denitrification device for the microbial electrolysis cell, which has the advantages of simple structure, convenience in use, and capability of quickly and efficiently removing refractory organic matters in a water body and removing nitrogen with a low C/N ratio.
In order to achieve the purpose, the invention adopts the following technical measures:
aiming at the problems, a microbial electrolysis cell MEC is combined with a downstream vertical flow constructed wetland to treat wastewater with difficultly degraded COD and high nitrogen content, the difficultly degraded COD is decomposed into water and carbon dioxide by utilizing the comprehensive action of a filler, microbes, plants and anodic oxidation in an anode conductive filler layer, and nitrogen compounds are converted into nitrate nitrogen; nitrate nitrogen is converted into nitrogen by utilizing the comprehensive action of filler, microorganism, plant and cathode reduction on the cathode conductive material layer, so that the problem of removing nitrogen under the conditions of difficult degradation COD and low C/N in the wastewater is solved. Meanwhile, in order to realize the rapid start of the MEC type constructed wetland of the microbial electrolysis cell and the capability of efficiently removing the COD and the nitrogen which are difficult to degrade in the wastewater, a specific artificial flora is added into the conductive filler layer to form a corresponding electrode biomembrane so as to improve the start speed of the constructed wetland, and a certain number of exhaust pipes are inserted around the electrode, so that the timely removal of gas is ensured, the reaction is efficiently carried out, and the potential risk of the damage of the constructed wetland caused by unsmooth pressure building of the cell body due to the unsmooth exhaust is also reduced.
Based on the structure of the downstream vertical flow artificial wetland, the MEC-type downstream vertical flow artificial wetland of the microbial electrolysis cell is formed by laying an anode conductive filler layer, a cathode conductive filler layer, an artificial strain introducing pipe and an exhaust pipe which are positioned in the conductive filler layer and introducing a direct current power supply. The method comprises the following steps: (1) by utilizing the comprehensive action of the filler, microorganisms, plants and anodic oxidation on the anode conductive filler layer, the nondegradable COD is decomposed into water and carbon dioxide, and the nitrogen compound is converted into nitrate nitrogen, so that the nondegradable organic matters are removed; (2) the nitrate nitrogen is converted into nitrogen by utilizing the comprehensive action of the filler, the microorganism, the plant and the cathode reduction on the cathode conductive material layer, so that the nitrogen compound is removed; (3) the dominant biological strains are introduced into the corresponding conductive filler layer through the artificial strain introducing pipe arranged in the conductive filler layer to form a corresponding anode/cathode biological membrane, so that the starting speed of the system is improved; (4) the gas carbon dioxide and nitrogen generated by the reaction are discharged out of the constructed wetland pool body through the exhaust pipe arranged in the conductive filler layer, so that the forward proceeding and reaction degree of the reaction are ensured.
In order to achieve the purpose, the invention provides the following technical scheme: a quick-start MEC-type downward vertical-flow constructed wetland decarbonization and denitrification device for a microbial electrolysis cell comprises an constructed wetland cell body, wherein a top water distribution pipe, a top non-conductive packing layer, an anode conductive packing layer, an artificial strain introducing pipe, an exhaust pipe, a non-conductive packing isolation layer, a cathode conductive packing layer, an artificial strain introducing pipe, an exhaust pipe, a bottom non-conductive packing layer and an exhaust pipe are paved in the constructed wetland cell body from top to bottom, the anode conductive packing layer in the constructed wetland cell body is respectively connected with the top non-conductive packing layer and the non-conductive packing isolation layer, the cathode conductive packing layer is respectively connected with the bottom non-conductive packing layer and the non-conductive packing isolation layer, artificial aquatic plants are planted in the top non-conductive packing layer, the top water distribution pipe is paved on the top non-conductive packing layer, and a cathode collector electrode and an anode collector electrode are respectively connected with a negative electrode, a negative electrode and a non-conductive packing isolation layer of a direct-current power supply through leads, The anode is connected to form a closed loop, the cathode collector and the anode collector are respectively arranged in the cathode conductive filler layer and the anode conductive filler layer, the anode conductive filler layer introduces anode artificial strains through an artificial strain introducing pipe arranged at the bottom of the anode conductive filler layer and cultures, acclimates and enriches the anode artificial strains on the surface of the anode conductive filler layer to form an anode biomembrane, organic matters which are difficult to degrade in the wastewater are decomposed into water and carbon dioxide under the comprehensive action of the filler, the biomembrane, plants and the anodic oxidation reaction, nitrogen compounds are converted into nitrate nitrogen, and the generated gas such as the carbon dioxide is discharged through an exhaust pipe arranged at the bottom of the filler layer; the cathode conductive filler layer is used for introducing cathode artificial strains through an artificial strain introducing pipe arranged at the bottom of the cathode conductive filler layer, culturing, domesticating and enriching the cathode artificial strains on the surface of the cathode conductive filler layer to form a cathode biological membrane, nitrate in the wastewater is converted into nitrogen under the comprehensive action of the filler, the biological membrane, plants and a cathode reduction reaction, and the generated nitrogen and other gases are discharged through an exhaust pipe arranged at the bottom of the filler layer.
The fillers in the anode conductive filler layer and the cathode conductive filler layer are granular activated carbon or graphite granules, the particle size of the granular activated carbon is 1-15 mm, and the filling density is 0.35-0.65 g/cm 3; the graphite particles have a particle size of 1 to 15mm and a packing density of 0.8 to 3.0g/cm 3.
The anode collector and the cathode collector are made of graphite felt, graphite rods or stainless steel rods.
Preferably, the constructed wetland tank body is of a reinforced concrete structure, and the depth range of the filled filler is 35-120 cm.
Preferably, the thickness of the top non-conductive filler layer is 10-25 cm; the thickness of the anode conductive packing layer is 5-30 cm; the thickness of the non-conductive filler isolation layer is 5-10 cm; the thickness of the cathode conductive filler layer is 5-30 cm; the thickness of the bottom non-conductive filler layer is 10-25 cm.
The bottom non-conductive filler layer, the non-conductive filler isolation layer and the top non-conductive filler layer are filled with one or four of crushed stone, anthracite, biological ceramsite and volcanic rock; the plants planted on the top non-conductive filler layer are one or more of celandine, wild rice stem, canna, rice grass, reed and iris.
Preferably, the artificial strain introducing pipe and the exhaust pipe which are arranged near the conductive filler layer are UPVC pipes in the form of orifices and are positioned at the bottoms of the anode conductive filler layer and the cathode conductive filler layer.
Preferably, the top water distribution pipe is a UPVC pipe with an outflow hole and is positioned above the top non-conductive packing layer, and the water outlet pipe is a UPVC pipe with an outflow hole and is positioned at the lower part of the bottom non-conductive packing layer.
The direct current power supply is a device for maintaining a stable current in the circuit, and can output voltage of 0-1.5V and output current of 0-200 mA.
A quick-start MEC-type downward vertical flow constructed wetland decarburization and denitrification method for a microbial electrolysis cell comprises the following steps:
A. the wastewater enters a top water distribution pipe on a non-conductive packing layer at the top of the constructed wetland tank body from a water inlet pipe and then descends in a plug-flow manner from top to bottom;
B. then the wastewater flows into an anode conductive filler layer, the refractory organic matter is decomposed into water and carbon dioxide by utilizing the comprehensive action of an anode biomembrane formed by the filler and the artificial strains and the anodic oxidation reaction, the nitrogen-containing compound is converted into nitrate nitrogen, and the generated gas is discharged out of the tank body through an exhaust pipe;
C. then the wastewater flows into a non-conductive filler isolation layer, and the layer mainly has the function of being used as a separator between a cathode conductive filler layer and an anode conductive filler layer;
D. then the wastewater flows into a cathode conductive filler layer, nitrate nitrogen is converted into nitrogen by utilizing the comprehensive action of a cathode biomembrane formed by the filler and the artificial strains and a cathode reduction reaction, and the generated nitrogen is discharged out of the pool body through an exhaust pipe;
E. finally, the wastewater flows out through a water outlet pipe in the bottom non-conductive filler layer, the COD (chemical oxygen demand) and the total nitrogen content of the effluent are greatly reduced, and compared with the conventional downward vertical flow constructed wetland coupling microbial electrolysis cell device for treating wastewater containing refractory organic matters and nitrogen compounds (C/N is less than 3), the removal rate is improved by 15-25%.
The anodic oxidation artificial strain is a type of microorganism with extracellular electron transfer, and comprises proteobacteria, firmicutes, acidibacter and actinomycetemcomitans; the artificial strains subjected to cathodic reduction are microorganisms which utilize inorganic carbon sources (carbon dioxide, carbonate and the like) to perform denitrification under the anoxic condition, the microorganisms comprise Proteobacteria, Flavobacterium and the like, and the treated wastewater is river water which contains refractory organic carbon and is polluted by non-point sources and has high nitrogen (C/N is less than 3).
Compared with the prior art, the invention has the beneficial effects that:
1. according to the quick-start MEC-type downward vertical flow constructed wetland decarbonization and denitrification device and method for the microbial electrolysis cell, on the basis of the existing constructed wetland coupling microbial electrolysis cell enhanced denitrification method and device, an artificial strain introducing pipe is added in the middle of the top and bottom conductive packing layers, and the efficient removal of refractory organic matters and total nitrogen substances is realized through the special culture and enrichment of artificial strains; the gas generated by the reaction can be discharged in time by adding the exhaust pipe, the reaction is promoted to be rapidly carried out, and the cell body is prevented from being suppressed to avoid the damage of the artificial wetland.
2. The quick-start MEC-type downward vertical flow constructed wetland decarbonization and denitrification device and method for the microbial electrolysis cell can remove refractory organic matters and total nitrogen substances in river water polluted by non-point sources.
Drawings
FIG. 1 is a schematic structural diagram of a quick-start MEC-type downward vertical flow constructed wetland decarbonization and denitrification device for a microbial electrolysis cell.
In the figure: 1. a bottom non-conductive filler layer; 2. A cathode conductive filler layer; 3. A non-conductive filler isolation layer; 4. An anode conductive filler layer; 5. A top non-conductive filler layer; 6. An exhaust pipe; 7. Introducing artificial strains into the tube; 8. An anode collector; 9. A cathode collector; 10. A wire; 11. A direct current power supply; 12. A top water distribution pipe; 13. A water outlet pipe; 14. Artificial wetland aquatic plants; 15. An artificial wetland pool body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides a quick-start MEC type downward vertical flow constructed wetland decarbonization and denitrification device, comprising an constructed wetland tank body 15, a top water distribution pipe 12, a top non-conductive packing layer 5, an anode conductive packing layer 4, an artificial bacteria introducing pipe 7, an exhaust pipe 6, a non-conductive packing isolation layer 3, a cathode conductive packing layer 2, an artificial bacteria introducing pipe 7, an exhaust pipe 6, a bottom non-conductive packing layer 1 and an exhaust pipe 13 are paved in the constructed wetland tank body 15 from top to bottom, the anode conductive packing layer 4 in the constructed wetland tank body 15 is respectively connected with the top non-conductive packing layer 5 and the non-conductive packing isolation layer 3, the cathode conductive packing layer 2 is respectively connected with the bottom non-conductive packing layer 1 and the non-conductive packing isolation layer 3, artificial wetland aquatic plants 14 are planted in the top non-conductive packing layer 5, the top water distribution pipe 12 is paved thereon, a cathode collector electrode 9 and an anode collector electrode 8 are respectively connected with the negative electrode and the positive electrode of a direct current power supply 11 through leads 10 to form a closed loop, the cathode collector electrode 9 and the anode collector electrode 8 are respectively arranged in a cathode conductive filler layer 2 and an anode conductive filler layer 4, the anode conductive filler layer 4 introduces anode artificial strains through an artificial strain introducing pipe 7 arranged at the bottom of the anode conductive filler layer and cultures, acclimates and enriches the anode artificial strains on the surface of the anode artificial strain introducing pipe to form an anode biomembrane, organic matters which are difficult to degrade in the wastewater are decomposed into water and carbon dioxide under the comprehensive action of the fillers, the biomembrane, plants and the anode oxidation reaction, nitrogen compounds are converted into nitrate nitrogen, and the generated gas such as the carbon dioxide is discharged through an exhaust pipe 6 arranged at the bottom of the filler layer; the cathode conductive filler layer 2 is used for introducing cathode artificial strains through an artificial strain introducing pipe 7 arranged at the bottom of the cathode conductive filler layer, culturing, domesticating and enriching the cathode artificial strains on the surface of the cathode conductive filler layer to form a cathode biological membrane, nitrate in the wastewater is converted into nitrogen under the comprehensive action of the filler, the biological membrane, plants and a cathode reduction reaction, and the generated nitrogen and other gases are discharged through an exhaust pipe 6 arranged at the bottom of the filler layer.
Further, the fillers in the anode conductive filler layer and the cathode conductive filler layer are granular activated carbon or graphite granules, the particle size of the granular activated carbon is 1-15 mm, and the filling density is 0.35-0.65 g/cm 3; the graphite particles have a particle size of 1 to 15mm and a packing density of 0.8 to 3.0g/cm 3.
Further, the anode collector and the cathode collector are made of graphite felt, graphite rods or stainless steel rods.
Further, the constructed wetland tank body 15 is of a reinforced concrete structure, and the depth range of the filled filler is 35-120 cm.
Further, the thickness of the top non-conductive packing layer 5 is 10-25 cm; the thickness of the anode conductive filler layer 4 is 5-30 cm; the thickness of the non-conductive filler isolation layer 3 is 5-10 cm; the thickness of the cathode conductive filler layer 2 is 5-30 cm; the thickness of the bottom non-conductive packing layer 1 is 10-25 cm.
Furthermore, the bottom non-conductive filler layer, the non-conductive filler isolation layer and the top non-conductive filler layer are filled with one or four of crushed stone, anthracite, biological ceramsite and volcanic rock; the plants planted on the top non-conductive filler layer are one or more of celandine, wild rice stem, canna, rice grass, reed and iris.
Further, the artificial strain introducing pipe 7 and the exhaust pipe 6 which are arranged near the conductive filler layer are UPVC pipes in the form of orifices and are positioned at the bottoms of the anode conductive filler layer 4 and the cathode conductive filler layer 2.
Further, the top water distribution pipe 12 is a UPVC pipe with an outflow opening and is positioned above the top non-conductive packing layer 5, and the water outlet pipe 13 is a UPVC pipe with an opening and is positioned at the lower part of the bottom non-conductive packing layer.
Furthermore, the DC power supply is a device for maintaining a constant current formed in the circuit, and can output a voltage of 0-1.5V and an output current of 0-200 mA.
The invention also provides a quick-start MEC type downward vertical flow constructed wetland decarburization and denitrification method for the microbial electrolysis cell, which comprises the following steps:
A. the wastewater enters a top water distribution pipe 12 on a non-conductive packing layer 5 at the top of the constructed wetland tank body from a water inlet pipe and then descends in a plug-flow manner from top to bottom;
B. then the wastewater flows into an anode conductive filler layer 4, the refractory organic matter is decomposed into water and carbon dioxide by utilizing the comprehensive action of an anode biomembrane formed by the filler and the artificial strains and the anodic oxidation reaction, the nitrogen-containing compound is converted into nitrate nitrogen, and the generated gas is discharged out of the tank body through an exhaust pipe 6;
C. then the wastewater flows into a non-conductive filler isolation layer 3, and the function of the layer is mainly used as a separator between a cathode conductive filler layer and an anode conductive filler layer;
D. then the wastewater flows into a cathode conductive filler layer 2, nitrate nitrogen is converted into nitrogen by utilizing the comprehensive action of a cathode biomembrane formed by the filler and the artificial strains and a cathode reduction reaction, and the generated nitrogen is discharged out of the pool body through an exhaust pipe 6;
E. finally, the wastewater flows out through a water outlet pipe 13 in the bottom non-conductive packing layer 1, the COD (chemical oxygen demand) and the total nitrogen content of the effluent are greatly reduced, and compared with the conventional downward vertical flow constructed wetland coupling microbial electrolysis cell device for treating wastewater containing refractory organic matters and nitrogen compounds, the removal rate is improved by 15-25 percent.
The wastewater to be treated is river water which contains nondegradable COD and is polluted by non-point sources and has high nitrogen (C/N is less than 3). The river water quality of the type is characterized in that: COD = 20-120 mg/l, TN = 5-50 mg/l.
The test result shows that: compared with the conventional downward vertical flow constructed wetland coupling microbial electrolysis tank for treating the nondegradable COD and wastewater with higher nitrogen content (C/N is less than 3), the removal rate of the device is improved by 15-25%.
In the embodiments of the present application, the descriptions of the directional terms such as "front", "back", "left" and "right" are only described according to the directions shown in the drawings shown in the present application, and are not limited to the scope of the claims of the present application, and in the specific implementation process, other similar or similar embodiments may be obtained by correspondingly modifying the embodiments according to the embodiments, and all of the embodiments are within the scope of the present application, and the descriptions of the other similar or similar embodiments are not repeated in the present application.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides a quick start's microorganism electrolysis cell MEC type device of vertical current constructed wetland decarbonization denitrogenation down, includes constructed wetland cell body (15), its characterized in that: a top water distribution pipe (12), a top non-conductive packing layer (5), an anode conductive packing layer (4), an artificial strain introducing pipe (7), an exhaust pipe (6), a non-conductive packing isolation layer (3), a cathode conductive packing layer (2), an artificial strain introducing pipe (7), an exhaust pipe (6), a bottom non-conductive packing layer (1) and an exhaust pipe (13) are paved in the artificial wetland cell body (15) from top to bottom, the anode conductive packing layer (4) in the artificial wetland cell body (15) is respectively connected with the top non-conductive packing layer (5) and the non-conductive packing isolation layer (3), the cathode conductive packing layer (2) is respectively connected with the bottom non-conductive packing layer (1) and the non-conductive packing isolation layer (3), artificial wetland aquatic plants (14) are planted in the top non-conductive packing layer (5), and the top water distribution pipe (12) is paved on the top, a cathode collector electrode (9) and an anode collector electrode (8) are respectively connected with the cathode and the anode of a direct current power supply (11) through leads (10) to form a closed loop, the cathode collector electrode (9) and the anode collector electrode (8) are respectively arranged in a cathode conductive filler layer (2) and an anode conductive filler layer (4), the anode conductive filler layer (4) introduces anode artificial strains through an artificial strain introducing pipe (7) arranged at the bottom of the anode conductive filler layer and cultures, acclimates and enriches the anode artificial strains on the surface of the anode conductive filler layer to form an anode biomembrane, organic matters which are difficult to degrade in the wastewater are decomposed into water and carbon dioxide under the comprehensive action of the filler, the biomembrane, plants and the anode oxidation reaction, nitrogen compounds are converted into nitrate nitrogen, and the generated gas such as the carbon dioxide is discharged through an exhaust pipe (6) arranged at the bottom of the filler layer; the cathode conductive filler layer (2) introduces cathode artificial strains through an artificial strain introducing pipe (7) arranged at the bottom of the cathode conductive filler layer, and cultures, acclimates and enriches the cathode artificial strains on the surface of the cathode artificial strains to form a cathode biological membrane, nitrate in the wastewater is converted into nitrogen under the comprehensive action of the filler, the biological membrane, plants and a cathode reduction reaction, and the generated nitrogen and other gases are discharged through an exhaust pipe (6) arranged at the bottom of the filler layer.
2. The quick start MEC type downward vertical flow constructed wetland decarbonization and denitrification device for the microbial electrolysis cell of claim 1 is characterized in that: the constructed wetland tank body (15) is of a reinforced concrete structure, and the depth range of the filled filler is 35-120 cm.
3. The quick start MEC type downward vertical flow constructed wetland decarbonization and denitrification device for the microbial electrolysis cell of claim 1 is characterized in that: the thickness of the top non-conductive packing layer (5) is 10-25 cm; the thickness of the anode conductive filler layer (4) is 5-30 cm; the thickness of the non-conductive filler isolation layer (3) is 5-10 cm; the thickness of the cathode conductive filler layer (2) is 5-30 cm; the thickness of the bottom non-conductive packing layer (1) is 10-25 cm.
4. The quick start MEC type downward vertical flow constructed wetland decarbonization and denitrification device for the microbial electrolysis cell of claim 1 is characterized in that: the artificial strain introducing pipe (7) and the exhaust pipe (6) which are arranged near the conductive filler layer are UPVC pipes in the form of orifices and are positioned at the bottoms of the anode conductive filler layer (4) and the cathode conductive filler layer (2).
5. The quick start MEC type downward vertical flow constructed wetland decarbonization and denitrification device for the microbial electrolysis cell of claim 1 is characterized in that: the top water distribution pipe (12) is a UPVC pipe with an outflow hole and is positioned above the top non-conductive packing layer (5).
6. A quick-start MEC-type downward vertical flow constructed wetland decarburization and denitrification method for a microbial electrolysis cell comprises the following steps:
A. the wastewater enters a top water distribution pipe (12) on a non-conductive packing layer (5) at the top of the constructed wetland tank body from a water inlet pipe and then descends in a plug-flow manner from top to bottom;
B. then the wastewater flows into an anode conductive filler layer (4), organic matters which are difficult to degrade are decomposed into water and carbon dioxide by utilizing the comprehensive action of an anode biomembrane formed by the filler and the artificial strains and an anode oxidation reaction, nitrogen-containing compounds are converted into nitrate nitrogen, and the generated gas is discharged out of the pool body through an exhaust pipe (6);
C. then the wastewater flows into a non-conductive filler isolation layer (3), and the function of the layer is mainly used as a separator between a cathode conductive filler layer and an anode conductive filler layer;
D. then the wastewater flows into a cathode conductive filler layer (2), nitrate nitrogen is converted into nitrogen by utilizing the comprehensive action of a cathode biomembrane formed by the filler and the artificial strains and a cathode reduction reaction, and the generated nitrogen is discharged out of the pool body through an exhaust pipe (6);
E. finally, the wastewater flows out through a water outlet pipe (13) in a bottom non-conductive packing layer (1), the COD (chemical oxygen demand) and the total nitrogen content of the effluent are greatly reduced, and compared with the conventional downward vertical flow constructed wetland coupling microbial electrolysis cell device for treating the wastewater containing refractory organic matters and nitrogen compounds (C/N is less than 3), the removal rate is improved by 15-25%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014082989A1 (en) * | 2012-11-28 | 2014-06-05 | Universitat De Girona | Bioelectrochemical water treatment and apparatus |
| CN105217796A (en) * | 2015-11-04 | 2016-01-06 | 中国科学院水生生物研究所 | A kind of method of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification and device |
| CN205368030U (en) * | 2015-12-28 | 2016-07-06 | 北京林业大学 | Vertical -flow constructed wetland system of getting rid of is reinforceed with total nitrogen to ammonia nitrogen |
| CN110980956A (en) * | 2019-12-11 | 2020-04-10 | 四川农业大学 | Microbial fuel cell coupled constructed wetland U-shaped device and operation method |
| CN214310265U (en) * | 2021-01-06 | 2021-09-28 | 中国环境科学研究院 | Wetland blocks up detection device based on microbial fuel cell |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014082989A1 (en) * | 2012-11-28 | 2014-06-05 | Universitat De Girona | Bioelectrochemical water treatment and apparatus |
| CN105217796A (en) * | 2015-11-04 | 2016-01-06 | 中国科学院水生生物研究所 | A kind of method of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification and device |
| CN205368030U (en) * | 2015-12-28 | 2016-07-06 | 北京林业大学 | Vertical -flow constructed wetland system of getting rid of is reinforceed with total nitrogen to ammonia nitrogen |
| CN110980956A (en) * | 2019-12-11 | 2020-04-10 | 四川农业大学 | Microbial fuel cell coupled constructed wetland U-shaped device and operation method |
| CN214310265U (en) * | 2021-01-06 | 2021-09-28 | 中国环境科学研究院 | Wetland blocks up detection device based on microbial fuel cell |
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