Coupling microbial fuel cell for Fenton mud biochar constructed wetland
By coupling a Fenton mud biochar constructed wetland with a microbial fuel cell, the problems of easy pulverization of iron-carbon fillers and low efficiency of constructed wetlands were solved, achieving efficient denitrification and phosphorus removal from wastewater and improving the system's treatment efficiency and resource recovery capabilities.
Patent Information
- Application Number
- CN202423146628.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing microbial fuel cells, the iron-carbon packing material is prone to pulverization and caking, leading to decreased efficiency. Furthermore, constructed wetlands have limited treatment efficiency and are difficult to effectively remove nitrate nitrogen and phosphorus from wastewater.
Using Fenton sludge biochar as a packing material, combined with microbial fuel cells and constructed wetland systems, the iron elements in Fenton sludge are used to burn biochar, which promotes heterotrophic denitrification and the growth of iron-related microorganisms, thereby improving the nitrate nitrogen removal efficiency.
It achieves efficient nitrogen and phosphorus removal treatment of wastewater, improves the system's treatment efficiency and resource recycling capacity, and uses readily available and environmentally friendly materials.
Smart Images
Figure CN223852409U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to sewage treatment technical field relates to the microbial fuel cell especially, a kind of fenton mud biochar constructed wetland coupling microbial fuel cell. BACKGROUND
[0002] Constructed wetland is an attractive alternative to traditional biological wastewater management methods, with many advantages, such as low construction and operation costs, easy maintenance, significant landscape effects and environmental friendliness. In particular, in small communities, rural areas and remote areas, centralized urban wastewater systems are not economically and technically feasible, and constructed wetlands are very feasible in wastewater treatment and resource recovery. In continuous water treatment systems, pollutants can be removed from wastewater streams through various pathways, such as microbial degradation and accumulation, phytoremediation, substrate adsorption, sedimentation and sedimentation, through the synergistic action of plants, substrates and microorganisms. Therefore, constructed wetlands can be used for wastewater management without the use of chemicals and electrical energy, achieving resource conservation and economic recycling.
[0003] Microbial fuel cell technology is a method of using microorganisms to metabolize organic matter through a bioelectrochemical process to convert it into electrical energy, and the iron-carbon filler therein has the disadvantages of high price, easy powdering and hardening and failure. Biochar is a carbon-rich solid material produced from biomass waste, with high porosity, large specific surface area, high adsorption capacity, good mechanical strength, stable chemical properties, light weight, easy availability and other characteristics. Therefore, biochar is widely used in wastewater treatment processes. A large amount of iron elements contained in Fenton sludge can be converted into biochar and added to constructed wetlands, which can potentially stimulate the growth of heterotrophic denitrification and iron-related microorganisms, thereby improving the removal efficiency of nitrate nitrogen.
[0004] Therefore, the fenton mud biochar constructed wetland coupling microbial fuel cell system can achieve efficient nitrogen and phosphorus removal treatment of wastewater, and has high application value. SUMMARY
[0005] In order to overcome the defects of the prior art, the utility model discloses a fenton mud biochar constructed wetland coupling microbial fuel cell.
[0006] TECHNICAL SOLUTION
[0007] The application discloses a Fenton sludge biochar constructed wetland coupled with a microbial fuel cell, which comprises a container main body, wherein the container main body is in a cylindrical barrel shape, and Fenton sludge biochar is filled in the barrel to strengthen sewage treatment and microbial adhesion effect; a water sample sampling port is arranged on the wall of the barrel; a water outlet is arranged at the bottom of the barrel; a water inlet is arranged at the top of the barrel; a large gravel layer, a first medium gravel layer, a second medium gravel layer and a small gravel layer are sequentially arranged in the barrel from bottom to top; a Fenton sludge biochar layer is arranged between the first medium gravel layer and the second medium gravel layer; an anode is arranged between the Fenton sludge biochar layer and the first medium gravel layer; a cathode is arranged on the surface of the small gravel layer and exposed to air, and is also called an air cathode; the anode and the cathode are connected by a wire and connected with a resistor.
[0008] In the preferred embodiment, the height of the large gravel layer is 80-100 mm, preferably 100 mm; the height of the first medium gravel layer is 180-200 mm, preferably 180 mm; the height of the Fenton sludge biochar layer is 80-100 mm, preferably 100 mm; the height of the second medium gravel layer is 200-300 mm, preferably 200 mm; and the height of the small gravel layer is 100-150 mm, preferably 120 mm.
[0009] Further, the particle size of the large gravel is 0.9-1.2 cm, the particle size of the medium gravel is 0.6-0.9 cm, and the particle size of the small gravel is 0.3-0.6 cm.
[0010] In the preferred embodiment, the Fenton sludge biochar is obtained from Fenton sludge in a sewage treatment plant, is baked at 500-700 DEG C, preferably 600 DEG C, in an oxygen-limited environment for 1-4 hours after drying, and is obtained.
[0011] In the preferred embodiment, five water sample sampling ports are arranged on the outer wall of the cylindrical container main body from bottom to top, wherein the first water sample sampling port is arranged on the outer side of the large gravel layer, the second water sample sampling port is arranged on the outer side of the first medium gravel layer, the third water sample sampling port is arranged on the outer side of the anode, the fourth water sample sampling port is arranged on the outer side of the small gravel layer, and the fifth water sample sampling port is arranged on the outer side of the cathode.
[0012] In the preferred embodiment, the anode and the cathode are made of carbon felt coated with a stainless steel mesh.
[0013] In the preferred embodiment, the wire is a copper wire.
[0014] In the preferred embodiment, wetland plants are planted on the surface of the cathode, and the planting density is 15-20 plants per square meter. -2 Further, the wetland plants are reed, alocasia odora and canna indica.
[0015] In the preferred embodiment, the application further comprises a wastewater barrel, which is connected with the water inlet through a peristaltic pump and a water distribution pipe.
[0016] Further, the volume of the wastewater bucket is 5-15L, the adjusting rotating speed of the peristaltic pump is 30ml / min, and the DN of the water distribution pipe is 0.4cm.
[0017] Advantages
[0018] The Fenton sludge biochar constructed wetland coupled microbial fuel cell has the advantages of simple preparation, easily available materials, and the like, can stimulate the growth of heterotrophic denitrification and iron-related microorganisms by adding the biochar prepared from a large amount of iron elements contained in Fenton sludge to the constructed wetland, and thus can improve the removal efficiency of nitrate nitrogen. Therefore, the Fenton sludge biochar constructed wetland coupled microbial fuel cell can realize efficient nitrogen and phosphorus removal treatment of wastewater, and has high application value. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 . Structure schematic view of the Fenton sludge biochar constructed wetland coupled microbial fuel cell;
[0020] Among them, the names of various components are: 1, large gravel layer; 2-1, first medium gravel layer; 2-2, second medium gravel layer; 3, small gravel layer; 4, Fenton sludge biochar layer; 5, anode; 6, cathode; 7, resistor; 8, water inlet; 9-1, first water sample sampling port; 9-2, second water sample sampling port; 9-3, third water sample sampling port; 9-4, fourth water sample sampling port; 9-5, fifth water sample sampling port, 10, water outlet; 11, wastewater bucket; 12, wetland plant; 13, wire; 14, peristaltic pump. DETAILED DESCRIPTION
[0021] The utility model will be described in detail below in combination with examples, so that those skilled in the art can better understand the utility model, but the utility model is not limited to the following examples.
[0022] Reference drawings Figure 1 A Fenton sludge biochar constructed wetland coupled microbial fuel cell, comprising a container main body, the container main body is cylindrical barrel shape, the barrel is filled with Fenton sludge biochar to strengthen sewage treatment and microbial adhesion effect, wherein, the water sample sampling port is arranged on the wall of the barrel, the water outlet 10 is arranged at the bottom, and the water inlet 8 is arranged at the top, the barrel is sequentially filled with large gravel layer 1, first medium gravel layer 2-1, second medium gravel layer 2-2 and small gravel layer 3 from bottom to top, Fenton sludge biochar layer 4 is arranged between first medium gravel layer 2-1 and second medium gravel layer 2-2, anode 5 is buried between Fenton sludge biochar layer 4 and first medium gravel layer 2-1, cathode 6 is exposed to air on the surface of small gravel layer 3, also known as air cathode, wetland plants 12 are planted on the surface of cathode 6, and the planting density is 15-20 plants m -2The wetland plants are reed, alocasia and canna, etc.; the anode 5 and the cathode 6 are connected by a wire 13 and connected with a resistor 7; the anode 5 and the cathode 6 are made of carbon felt coated stainless steel mesh; the wire 13 is copper wire. There are five water sampling ports on the outer side wall of the cylindrical container body from bottom to top, wherein the first water sampling port 9-1 is located outside the large gravel layer 1, the second water sampling port 9-2 is located outside the first middle gravel layer 2-1, the third water sampling port 9-3 is located outside the anode 5, the fourth water sampling port 9-4 is located outside the small gravel layer 3, and the fifth water sampling port 9-5 is located outside the cathode 6.
[0023] The large gravel layer 1 has a height of 80-100 mm and a large gravel particle size of 0.9-1.2 cm; the first middle gravel layer 2-1 has a height of 180-200 mm and a middle gravel particle size of 0.6-0.9 cm; the Fenton sludge biochar layer 4 has a height of 80-100 mm, and the second middle gravel layer 2-2 has a height of 200-300 mm and the small gravel layer 3 has a height of 100-150 mm and a small gravel particle size of 0.3-0.6 cm.
[0024] The Fenton sludge biochar is obtained from Fenton sludge of a sewage treatment plant, dried, and then baked at 500-700 DEG C for 1-4 h in an oxygen-limited environment.
[0025] The system further comprises a wastewater bucket 11 connected with the water inlet 8 through a water distribution pipe and a peristaltic pump 14; the volume of the wastewater bucket 11 is 5-15 L, the adjusted rotating speed of the peristaltic pump is 30 ml / min, and the DN of the water distribution pipe is 0.4 cm.
[0026] During the operation of the system, sewage enters the peristaltic pump from the water inlet to form a downward vertical flow operation mode, wetland plants such as alocasia, canna and reed are planted above the cathode at the top, the hydraulic retention time is reasonably set, and the plants can promote the removal of pollutants in water. In the process of removing organic matter, the anode microorganism converts organic matter into electrons and protons, and the electrons and protons migrate to the cathode to generate electric energy. Since the Fenton sludge biochar itself has good electrical conductivity, and the iron oxide contained therein can enrich iron (III) reducing microorganisms. These microorganisms can utilize various organic matter to accelerate the decomposition of complex organic matter through direct interspecies electron transfer, thereby providing substrates for denitrification reaction, not only promoting the degradation effect of pollutants, but also providing a good survival environment for the growth of denitrification microorganisms, so as to promote the pollutant removal effect of the device and improve the generation of electric energy.
[0027] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A Fenton sludge biochar constructed wetland coupled microbial fuel cell, comprising a container body, the container body is a cylindrical barrel, the barrel is filled with Fenton sludge biochar to enhance sewage treatment and microbial attachment effect, the Fenton sludge biochar is obtained from Fenton sludge of a sewage treatment plant, dried, and then calcined at 500-700℃ for 1-4h in a limited oxygen environment, characterized in that: The barrel wall is provided with water sampling ports, the bottom is provided with a water outlet (10), the top is provided with a water inlet (8), the barrel is sequentially provided with a large gravel layer (1), a first medium gravel layer (2-1), a second medium gravel layer (2-2) and a small gravel layer (3) from bottom to top, a Fenton mud biochar layer (4) is arranged between the first medium gravel layer (2-1) and the second medium gravel layer (2-2), an anode (5) is buried between the Fenton mud biochar layer (4) and the first medium gravel layer (2-1), a cathode (6) is exposed to air on the surface of the small gravel layer (3), also known as an air cathode; the anode (5) and the cathode (6) are connected by a wire (13) and connected with a resistor (7); five water sampling ports are arranged on the outer wall of the cylindrical container body from bottom to top, wherein the first water sampling port (9-1) is located on the outer side of the large gravel layer (1), the second water sampling port (9-2) is located on the outer side of the first medium gravel layer (2-1), the third water sampling port (9-3) is located on the outer side of the anode (5), the fourth water sampling port (9-4) is located on the outer side of the small gravel layer (3), and the fifth water sampling port (9-5) is located on the outer side of the cathode (6).
2. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 1, wherein: The height of the large gravel layer (1) is 80-100 mm; the height of the first medium gravel layer (2-1) is 180-200 mm; the height of the Fenton mud biochar layer (4) is 80-100 mm; the height of the second medium gravel layer (2-2) is 200-300 mm; and the height of the small gravel layer (3) is 100-150 mm.
3. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 2, wherein: The height of the large gravel layer (1) is 100 mm, the height of the first medium gravel layer (2-1) is 180 mm, the height of the Fenton mud biochar layer (4) is 100 mm, the height of the second medium gravel layer (2-2) is 200 mm, and the height of the small gravel layer (3) is 120 mm.
4. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 1, wherein: The particle size in the large gravel layer (1) is 0.9-1.2 cm, the particle size in the first medium gravel layer (2-1) and the second medium gravel layer (2-2) is 0.6-0.9 cm, and the particle size in the small gravel layer (3) is 0.3-0.6 cm.
5. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 1, wherein: The anode (5) and the cathode (6) are made of carbon felt coated stainless steel mesh.
6. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 1, wherein: The wire (13) is a copper wire.
7. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of claim 1, wherein: The wetland plants (12) are planted on the surface of the cathode (6) at a planting density of 15-20 plants per square meter -2 .
8. The Fenton sludge biochar constructed wetland coupled microbial fuel cell of any one of claims 1-7, wherein: Further comprising a wastewater barrel (11) connected with the water inlet (8) through a water distribution pipe and a peristaltic pump (14).