Enhanced denitrification device for microbial electrolysis constructed wetland

Abstract

The utility model relates to an enhanced denitrification device for a microbial electrolysis constructed wetland. The enhanced denitrification device comprises a constructed wetland system, an electrolysis system and an intelligent control system, the constructed wetland system comprises a water distribution area and a constructed wetland reaction area; a water inlet device is arranged in the water distribution area, and the water distribution area is communicated with the constructed wetland reaction area through the water inlet device; wherein an electrolysis system and an intelligent control system are also arranged in the constructed wetland reaction zone. The device has the advantages that the removal of pollutants, mainly nitrogen, of the constructed wetland is enhanced by mainly utilizing external voltage in the electrolysis system 2, and the water inlet flow, the external voltage and the distance between the electrodes can be adjusted according to the intelligent control system 3, so that the surface hydraulic load of the constructed wetland and the current intensity in the wetland are controlled; and the two systems cooperate to enhance the removal of pollutants, especially nitrogen, of the constructed wetland, so that the pollutants in water are efficiently removed, the water quality of discharged wastewater is improved, and the environmental water quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, and relates to a microbial electrolysis artificial wetland enhanced denitrification device. BACKGROUND

[0002] With the acceleration of urbanization and industrialization, industrial sewage and urban sewage are discharged in large quantities, although treated by sewage plants, but most of the tail water discharged by the sewage treatment plants still contains high pollutants, the tail water containing pollutants is directly discharged into the receiving water body, thereby intensifying the pollution of the receiving water body, bringing high nitrogen and phosphorus pollution load to rivers and lakes, causing eutrophication, water algae outbreak, water quality deterioration and other negative effects.

[0003] Nitrogen pollution and the resulting water eutrophication seriously endanger human and ecological system health; to improve people's living standards and maintain normal ecological functions of the environment, it is necessary to treat nitrogen in tail water of sewage plants, among many nitrogen-containing wastewater treatment processes, biological denitrification technology is widely used in denitrification treatment of various nitrogen-containing wastewater due to its advantages of high efficiency, low consumption and less secondary pollution.

[0004] At present, for the upgrading work of tail water of sewage plants, artificial wetlands are widely used due to their environmental friendliness, convenient operation, simple management, high efficiency and low consumption; but artificial wetlands have large land occupation and the treatment efficiency still needs to be improved.

[0005] Chinese patent application CN202420479557.7 discloses a device for promoting denitrification of urban river artificial wetlands, which comprises a device body, a biological filler is installed inside the device body, installation plates are installed on the left and right sides of the biological filler, two installation blocks are fixedly connected to the right side of the right installation plate, installation cavities are installed on the left and right sides of the inner wall of the device body, a compression plate matched with the installation plate is installed inside the left installation cavity, the right installation plate is placed in the right installation cavity, and the installation blocks are located in the installation grooves, at the same time, the left installation plate enters the installation cavity and compresses the compression plate, the spring is compressed, and the biological filler is horizontally installed in the device body, then the installation plate and the installation cavity are bolted through the fixing bolts, so that the biological filler is conveniently installed or disassembled, and the biological filler is conveniently replaced or maintained; but the device does not consider the tail water treatment and upgrading work of sewage plants. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the above problems existing in the prior art, and provides a microbial electrolysis artificial wetland enhanced denitrification device.

[0007] To achieve the above purpose, the utility model adopts the technical scheme of:

[0008] The application discloses a microbial electrolytic constructed wetland device for enhancing denitrification, which comprises a constructed wetland system, an electrolysis system and an intelligent control system; the constructed wetland system comprises a water distribution area and a constructed wetland reaction area; a water inlet device is arranged in the water distribution area, and the water distribution area is in communication with the constructed wetland reaction area through the water inlet device; wherein the electrolysis system and the intelligent control system are further arranged in the constructed wetland reaction area.

[0009] Preferably, the water inlet device comprises a water pump, a water inlet pipe, a water distribution main pipe and a water distribution pipe; wherein the water pump is arranged in the water distribution area, one end of the water pump is connected with the water inlet pipe, and sewage in the water distribution area enters the constructed wetland reaction area through the water inlet pipe; the water distribution main pipe and the water distribution pipe are arranged in the constructed wetland reaction area; wherein one end of the water distribution main pipe is in communication with the water inlet pipe, the other end of the water distribution main pipe is in communication with the water distribution pipe, a spray head is further arranged on the water distribution pipe, and the spray head is used for spraying the sewage entering through the water distribution pipe to the surface layer of the constructed wetland reaction area.

[0010] Preferably, the surface layer of the constructed wetland reaction area is further provided with a plurality of wetland plants, and the wetland plants are used for removing pollutants in the sewage.

[0011] Preferably, from top to bottom, the surface layer is further sequentially provided with a cathode layer, an intermediate layer, an anode layer, a transition layer and a supporting layer; wherein the sewage in the surface layer presents a downward flow state in the constructed wetland, and sequentially flows downward through the cathode layer, the intermediate layer, the anode layer, the transition layer and the supporting layer via the surface layer of the constructed wetland.

[0012] Preferably, a water collecting pipe is arranged in the supporting layer, and the water collecting pipe is used for collecting the sewage flowing downward through the surface layer; wherein one end of the water collecting pipe is further connected with a drain pipe, and the drain pipe is used for discharging the water collected by the water collecting pipe.

[0013] Preferably, the cathode layer, the intermediate layer and the anode layer are respectively correspondingly provided with an anode water taking hole, an intermediate water taking hole and a cathode water taking hole, and an anode substrate sampling hole, an intermediate substrate sampling hole and a cathode substrate sampling hole.

[0014] Preferably, the electrolysis system comprises a power supply, a resistor, a wire, an anode electrode material and a cathode electrode material; wherein the anode electrode material is arranged in multiple and uniformly distributed in the anode layer; the cathode electrode material is also arranged in multiple and uniformly distributed in the cathode layer; and the anode electrode material and the cathode electrode material are sequentially electrically connected with the resistor and the power supply through the wire.

[0015] Preferably, the intelligent control system comprises a data collector, an information feedback module and an intelligent decision module which are electrically connected; the data collector is arranged in the water inlet pipe and the drain pipe respectively, and is used for collecting the pollutant concentration at the water inlet pipe and the drain pipe and transmitting the collected data to the information feedback module; the information feedback module is used for analyzing the water inlet pollutant concentration and the water outlet pollutant concentration and feeding back to the information decision module; and the information decision module controls the water inlet flow and the water outlet flow of the water pump so as to change the hydraulic retention time of the constructed wetland, and selects the anode electrode material and the cathode electrode material and the voltage size, so as to control the electrolysis system.

[0016] Preferably, the supporting layer has a filler particle size of 10-30 mm and a filler thickness of 0.2-0.3 m.

[0017] The transition layer has a filler particle size of 5-10 mm and a filler thickness of 0.2-0.3 m.

[0018] The anode layer, the intermediate layer and the cathode layer each have a filler particle size of 2-6 mm and a filler thickness of 0.4-1.4 m.

[0019] Preferably, the electrolysis system controls the voltage at 0-2 V, and the spacing between each of the anode electrode materials and each of the cathode electrode materials is 0.1 m.

[0020] Thanks to the above technical solutions, the utility model has the following beneficial effects:

[0021] 1. The utility model utilizes the external voltage in the electrolysis system to strengthen the removal of pollutants, mainly nitrogen, by the constructed wetland, and adjusts the water inlet flow, the external voltage and the spacing between the electrodes according to the intelligent control system, so as to control the surface hydraulic load of the constructed wetland and the current intensity in the wetland, and to strengthen the removal of pollutants, especially nitrogen, by the constructed wetland, so that the pollutants in the water quality are removed efficiently, the water quality of the discharged wastewater is improved, and the quality of the environmental water body is improved.

[0022] 2. The utility model can reasonably utilize the existing constructed wetland for reconstruction, and has the advantages of convenient operation and running, stable performance, long-term efficient operation and management, etc. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the planar arrangement drawing of the microbial electrolysis constructed wetland denitrification device of the utility model.

[0024] Figure 2 is the sectional view of the microbial electrolysis constructed wetland denitrification device of the utility model.

[0025] Figure 3It is the section view of the microbial electrolysis artificial wetland enhanced denitrification device.

[0026] Figure 4 It is the principle view of the microbial electrolysis artificial wetland enhanced denitrification device.

[0027] The reference signs are shown as follows:

[0028] 1, artificial wetland system; 11, water distribution area; 12, artificial wetland reaction area;

[0029] 1-1, water pump; 1-2, water inlet pipe; 1-3, water distribution main pipe; 1-4, water distribution pipe; 1-5, spray head;

[0030] 1-6, wetland plant; 1-7, cathode layer; 1-8, intermediate layer; 1-9, anode layer; 1-10, transition layer;

[0031] 1-11, supporting layer; 1-12, water collecting pipe; 1-13, drain pipe; 1-14, air vent stand pipe;

[0032] 1-15, anode water taking hole; 1-16, intermediate water taking hole; 1-17, cathode water taking hole;

[0033] 1-18, anode substrate sampling hole; 1-19, intermediate substrate sampling hole; 1-20, cathode substrate sampling hole;

[0034] 2, electrolysis system; 2-1, power supply; 2-2, wire; 2-3, resistor; 2-4, anode electrode material; 2-5, cathode electrode material;

[0035] 3, intelligent control system; 3-1, data collector; 3-2, information feedback module; 3-3, information decision module 3-3. DETAILED DESCRIPTION

[0036] Please refer to the accompanying Figures 1-3 The utility model provides a kind of microbial electrolysis artificial wetland enhanced denitrification device, including artificial wetland system 1, electrolysis system 2 and intelligent control system 3;It mainly utilizes the voltage of electrolysis system 2 to strengthen the removal of artificial wetland to pollutant, mainly nitrogen, and can be adjusted according to intelligent control system 3 Water flow and applied voltage and the spacing between electrode, to control the surface hydraulic load of artificial wetland and the current intensity of wetland interior, the removal of artificial wetland to pollutant, especially nitrogen, is strengthened in coordination, so that pollutant in water quality is removed efficiently, so that the water quality of discharge wastewater is upgraded, and environmental water quality is improved.

[0037] In the embodiment, the artificial wetland system 1 comprises a water distribution area 11 and an artificial wetland reaction area 12; a water inlet device is arranged in the water distribution area 11, and the water distribution area 11 is in communication with the artificial wetland reaction area 12 through the water inlet device; wherein the electrolytic system 2 and the intelligent control system 3 are further arranged in the artificial wetland reaction area 11; the water inlet device comprises a water pump 1-1, a water inlet pipe 1-2, a water distribution main pipe 1-3 and a water distribution pipe 1-4; wherein the water pump 1-1 is arranged in the water distribution area 11, used for pumping the sewage in the water distribution area, and the sewage is introduced into the artificial wetland reaction area through the water inlet pipe connected at one end; the water distribution main pipe 1-3 and the water distribution pipe 1-4 are further arranged in the artificial wetland reaction area 12, wherein the water distribution main pipe 1-3 is in communication with the water inlet pipe 1-2 at one end, and in communication with the water distribution pipe 1-4 at the other end, and a spray head 1-5 is further arranged on the water distribution pipe 1-4; the sewage is lifted by the water pump to enter the water inlet pipe 1-2, and is uniformly sent to the water distribution main pipe 1-3, and the water distribution pipe 1-4 connected with the water distribution main pipe 1-3 receives the wastewater, and the wastewater is sprayed to the surface layer of the artificial wetland by the spray head 1-5 on the water distribution pipe; correspondingly, a plurality of wetland plants 1-6 are planted on the surface layer of the artificial wetland reaction area 12, and the wetland plants 1-6 are used to remove the pollutants in the wastewater; in the embodiment, the wetland plants 1-6 are generally selected from emergent plants, such as reed, cattail, and rush, etc.

[0038] In the embodiment, the surface layer is sequentially laid with a cathode layer 1-7, an intermediate layer 1-8, an anode layer 1-9, a transition layer 1-10 and a supporting layer 1-11 from top to bottom below the surface layer; wherein the wastewater in the surface layer presents a downward flow state in the artificial wetland, and flows downward through the cathode layer 1-7, the intermediate layer 1-8, the anode layer 1-9, the transition layer 1-10 and the supporting layer 1-11 in sequence; wherein a water collecting pipe 1-12 is arranged in the supporting layer 1-11, and the water collecting pipe 1-12 is used for collecting the wastewater flowing down through the surface layer; correspondingly, a drain pipe 1-13 is further connected at one end of the water collecting pipe 1-12, and the drain pipe 1-13 is used for discharging the water collected by the water collecting pipe 1-12; wherein in order to facilitate aeration, an aeration stand pipe 1-14 is further arranged on the drain pipe 1-13, and the aeration stand pipe 1-14 is used for improving the drainage efficiency of the drain pipe 1-13 by aeration and increasing flow smoothness, and can also prevent the internal blockage of the artificial wetland.

[0039] In the embodiment, the cathode layer 1-7, the intermediate layer 1-8 and the anode layer 1-9 are respectively provided with the anode water sampling hole 1-15, the intermediate water sampling hole 1-16 and the cathode water sampling hole 1-17, and the anode substrate sampling hole 1-18, the intermediate substrate sampling hole 1-19 and the cathode substrate sampling hole 1-20; wherein the anode water sampling hole 1-15, the intermediate water sampling hole 1-16 and the cathode water sampling hole 1-17 facilitate the collection of water samples of the artificial wetland in the later stage, the anode substrate sampling hole 1-18, the intermediate substrate sampling hole 1-19 and the cathode substrate sampling hole 1-20 facilitate the sampling of the substrate of the artificial wetland in the later stage, which is conducive to the monitoring of the anode and cathode of the artificial wetland in the later stage, and facilitates the adjustment of the anode and cathode layers.

[0040] In the embodiment, the electrolysis system 2 comprises a power supply 2-1, a resistor 2-2, a wire 2-3, an anode electrode material 2-4 and a cathode electrode material 2-5; wherein the anode electrode material 2-4 is provided in multiple and uniformly distributed in the anode layer 1-9; the cathode electrode material 2-5 is also provided in multiple and uniformly distributed in the cathode layer 1-7; and the anode electrode material 2-4 and the cathode electrode material 2-5 are both electrically connected with the resistor 2-2 and the power supply 2-1 in sequence through the wire 2-3, and each anode electrode material 2-4 and cathode electrode material 2-5 are independent of each other, that is, the power current can reach any anode electrode material and cathode electrode material independently, forming a connection in the artificial wetland.

[0041] In the embodiment, the intelligent control system 3 comprises a data collector 3-1, an information feedback module 3-2 and an intelligent decision module 3-3 which are electrically connected; wherein the data collector 3-1 is arranged in the water inlet pipe 1-2 and the drain pipe 1-13 respectively, for collecting the pollutant concentration at the water inlet pipe 1-2 and the drain pipe 1-13, and transmitting the collected data to the information feedback module 3-2; the information feedback module 3-2 is used for analyzing the water inlet pollutant concentration and the water outlet pollutant concentration, and feeding back to the information decision module 3-3; the information decision module 3-3 controls the water inlet flow and the water outlet flow of the water pump 1-1 to change the hydraulic retention time of the artificial wetland, and selects appropriate anode electrode material 2-4 and cathode electrode material 2-5 and voltage size to control the electrolysis system, so that the artificial wetland system and the electrolysis system reach a processing balance, thereby efficiently removing the pollutants in the wastewater, mainly the total nitrogen in the wastewater.

[0042] In the embodiment, the surface hydraulic load q of the artificial wetland system 1 is 0.4-1.5 m 3 / (m 2 ·d), and the surface hydraulic load is used to calculate the area of the artificial wetland:

[0043]

[0044] Q——design flow, m3 / d,

[0045] q - surface hydraulic loading, m 3 / (m 2 ·d)

[0046] The implementation is as follows:

[0047] The tail water discharge of a certain sewage plant is 10000t / d, and 10 microbial electrolysis constructed wetlands are planned to be used, i.e. the treatment capacity of each microbial electrolysis constructed wetland is 1000t / d. It is decided that the surface hydraulic loading of the microbial electrolysis constructed wetland is 0.8m 3 / (m 2 ·d).

[0048] The area of the microbial electrolysis constructed wetland is:

[0049]

[0050] Therefore, the size of the microbial electrolysis constructed wetland is 25mx50m.

[0051] In the embodiment, the height of the support layer 1-12 can be 0.2m, and the particle size of the goose egg stones is 20mm; the height of the transition layer 1-10 is 0.2m, and the particle size of the zeolite is 10mm; the height of the anode layer 1-9, the intermediate layer 1-8 and the cathode layer 1-7 is all 0.5m, and the particle size of the biochar is 2mm, wherein the anode 1-9 and the cathode layer 1-7 are uniformly arranged with 4 electrode materials.

[0052] The applied voltage is 0.8V, and the two electrode materials farthest apart are selected as the initial electrodes.

[0053] When facing water quality changes and water quality upgrading, the surface hydraulic loading, voltage size and distance between electrodes can be changed to ensure that the water quality continues to meet the standard.

[0054] It should be noted that: the utility model can reasonably utilize the existing constructed wetland for reconstruction, and take the tail water upgrading of the sewage plant as the target, according to the tail water quality, the current intensity of the water inflow is reasonably adjusted through intelligent control, so that the tail water quality is stable and meets the standard, and then the water quality of different tail water can be adjusted, and the tail water quality can be improved and stabilized for a long time.

[0055] The above related description and the description of the embodiments are for facilitating the ordinary skilled in the art to understand and apply the present application. Those skilled in the art can obviously easily make various modifications to these contents, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above related description and the description of the embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present application without departing from the scope of the present application should be within the protection scope of the present application.

Claims

1. A microbial electrolysis constructed wetland enhanced denitrification device, characterized in that, The system comprises an artificial wetland system, an electrolysis system and an intelligent control system. The artificial wetland system comprises a water distribution area and an artificial wetland reaction area; the water distribution area is provided with a water inlet device, and the water distribution area and the artificial wetland reaction area are connected to each other through the water inlet device; the artificial wetland reaction area is further provided with an electrolysis system and an intelligent control system.

2. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 1, characterized in that, The water inlet device comprises a water pump, a water inlet pipe, a water distribution main pipe and a water distribution pipe. The water pump is arranged in the water distribution area, and one end of the water pump is connected with the water inlet pipe; sewage in the water distribution area enters the artificial wetland reaction area through the water inlet pipe. The water distribution main pipe and the water distribution pipe are arranged in the artificial wetland reaction area; one end of the water distribution main pipe is communicated with the water inlet pipe, and the other end of the water distribution main pipe is communicated with the water distribution pipe; the water distribution pipe is further provided with a spray head, which is used for spraying the sewage entering through the water distribution pipe to the surface layer of the artificial wetland reaction area.

3. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 2, characterized in that, The surface layer of the artificial wetland reaction area is further provided with a plurality of wetland plants, which are used for removing pollutants in the wastewater.

4. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 2, characterized in that, The surface layer is further sequentially provided with a cathode layer, an intermediate layer, an anode layer, a transition layer and a supporting layer from top to bottom; the wastewater in the surface layer presents a downward flow state in the artificial wetland, and sequentially flows downward through the cathode layer, the intermediate layer, the anode layer, the transition layer and the supporting layer.

5. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 4, characterized in that, The supporting layer is provided with a water collecting pipe, which is used for collecting the wastewater flowing downward through the surface layer; one end of the water collecting pipe is further connected with a drain pipe, which is used for discharging the water collected by the water collecting pipe.

6. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 4, characterized in that, The cathode layer, the intermediate layer and the anode layer are respectively provided with an anode water taking hole, an intermediate water taking hole and a cathode water taking hole, and an anode substrate sampling hole, an intermediate substrate sampling hole and a cathode substrate sampling hole.

7. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 6, characterized in that, The electrolysis system comprises a power supply, a resistor, a wire, an anode electrode material and a cathode electrode material; the anode electrode material is arranged in multiple and uniformly distributed in the anode layer; the cathode electrode material is also arranged in multiple and uniformly distributed in the cathode layer; and the anode electrode material and the cathode electrode material are sequentially electrically connected with the resistor and the power supply through the wire.

8. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 7, characterized in that, The intelligent control system comprises a data collector, an information feedback module and an intelligent decision module which are electrically connected; the data collector is arranged in the water inlet pipe and the drain pipe respectively, and is used for collecting the pollutant concentration at the water inlet pipe and the drain pipe and transmitting the collected data to the information feedback module; The information feedback module is used for analyzing the inlet pollutant concentration and the outlet pollutant concentration, and feeding back to the information decision module; The information decision module controls the water inlet flow and the water outlet flow of the water pump to change the hydraulic retention time of the artificial wetland, and selects the appropriate anode electrode material and cathode electrode material and voltage size to control the electrolysis system.

9. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 4, characterized in that, The supporting layer filler particle size is 10-30mm, and the filler thickness is 0.2-0.3m; The transition layer filler particle size is 5-10mm, and the filler thickness is 0.2-0.3m; The anode layer, the intermediate layer, the cathode layer, and the filler have a particle size of 2-6mm, and the thickness of the filler is 0.4-1.4m.

10. The microbial electrolytic constructed wetland enhanced denitrification device according to claim 7, characterized in that, The electrolysis system controls the voltage at 0-2V, and the distance between each piece of the anode electrode material and each piece of the cathode electrode material is set to 0.1m.

Images