CN116375210A - Microbial fuel cell constructed wetland system and method for strengthening freshwater fishery culture tail water treatment - Google Patents
Microbial fuel cell constructed wetland system and method for strengthening freshwater fishery culture tail water treatment Download PDFInfo
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- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
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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
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9008—Organic or organo-metallic compounds
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- H—ELECTRICITY
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- 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
- C02F2101/00—Nature of the contaminant
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- C02F2101/105—Phosphorus compounds
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention belongs to the field of fish culture tail water treatment, and particularly relates to a microbial fuel cell constructed wetland system and a method for strengthening the treatment of fresh water fish culture tail water. The invention firstly screens out blue algae and extracellular respiratory bacteria suitable for the treatment of the freshwater aquaculture wastewater and constructs the electro-active bacterial algae biomembrane, and simultaneously constructs a microbial fuel cell constructed wetland system for strengthening the treatment of the freshwater aquaculture wastewater by combining with a constructed wetland coupling electrode mode, thereby realizing the continuous and efficient degradation of carbon, nitrogen, phosphorus, antibiotics and heavy metals in the freshwater aquaculture wastewater and having the advantages of simple structure, flexible operation, rapid starting, stable operation, no aeration, low operation cost and the like.
Description
Technical Field
The invention belongs to the field of freshwater fishery culture tail water treatment, and relates to a microbial fuel cell constructed wetland system and a method for strengthening freshwater fishery culture tail water treatment.
Background
The fish culture tail water is organic wastewater rich in pollutants such as nitrogen, phosphorus and the like, and most of the culture tail water is directly discharged into natural water at present, so that the fish culture tail water has negative influence on the environment. In order to improve the efficiency of the treatment of the aquaculture tail water and reduce the cost of the water treatment, in recent years, many low cost technologies for the treatment of the aquaculture tail water have been studied, such as Anaerobic Digestion (AD) which is widely used in the treatment of the nitrogen-containing aquaculture tail water due to the advantages of decontamination, energy saving and the like, and artificial wetlands (CWs) which are generally used for treating the effluent of an AD system to improve the overall quality of the effluent, however, the above technologies have limited purification treatment degree and no sustainability for the aquaculture tail water.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a microbial fuel cell constructed wetland system and a method for strengthening the treatment of freshwater aquaculture tail water.
Based on the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a microbial fuel cell artificial wetland system for strengthening the treatment of freshwater fishery culture tail water, which sequentially comprises a cobble layer, a first fine crushed stone layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine crushed stone layer, a second carbon cloth layer and a carbon-carried electroactive bacteria algae biomembrane from bottom to top; the first carbon cloth layer and the second carbon cloth layer are connected through conductive wires;
the electroactive bacteria algae biological film is formed by mixing and culturing blue algae and extracellular respiratory bacteria; the blue algae is blue fungus genus Cyanobium, and the extracellular respiratory bacteria is Ottowia.
The invention screens out blue algae and extracellular respiratory bacteria suitable for the treatment of the freshwater aquaculture tail water, constructs the blue algae and extracellular respiratory bacteria into the electroactive bacteria algae biological film, is arranged in the constructed wetland, is also coupled with an electrode, and enables a microbial fuel cell to be formed in continuous water flow through the coupling electrode, thereby promoting the growth of extracellular respiratory bacteria in the electroactive bacteria algae biological film and enabling the electroactive bacteria algae biological film to continuously exert the purification effect on the freshwater aquaculture tail water.
Preferably, the thickness of the cobble layer is 0.1-0.3 m, the thickness of the first fine crushed stone layer is 0.2-0.4 m, the total thickness of the columnar activated carbon layer and the first carbon cloth layer is 0.2-0.4 m, the thickness of the second fine crushed stone layer is 0.1-0.2 m, the thickness of the second carbon cloth layer is 5-10 mm, and the thickness of the carbon-loaded electroactive bacteria algae biomembrane is 0.1-0.2 m.
Preferably, the electroactive bacteria algae biofilm is prepared by the following method:
(1) Culturing the cyanobacterium in a culture medium to a logarithmic growth phase to obtain a cyanobacterium suspension, wherein the biomass of the cyanobacterium in the cyanobacterium suspension is 0.2-0.3 g/L;
(2) Inoculating extracellular respiratory bacteria into a catholyte and an anolyte of a microbial fuel cell, finishing enrichment and domestication of the extracellular respiratory bacteria when the output voltage of the microbial fuel cell is more than 300mV, and collecting an electrode solution to obtain a sludge suspension containing the extracellular respiratory bacteria, wherein the biomass of the extracellular respiratory bacteria in the sludge suspension is 0.1-0.5 g/L;
(3) Mixing the blue algae suspension and the sludge suspension according to a dry weight ratio of 1:0.2-0.5, and carrying out mixed culture for 30-45 days under the conditions of 4h illumination, 20h photoperiod illumination period and room temperature to construct the electroactive bacterial algae biomembrane.
Preferably, in the step (1), 10% -30% (v: v) of fresh water fishery cultivation tail water is added into a culture medium for culturing the cyanobacteria, the ammonia nitrogen content in the fresh water fishery cultivation tail water is 2-5 mg/L, the total nitrogen content is 8-14 mg/L, the nitrate content is 5-10 mg/L, the total phosphorus content is 1-3 mg/L, and the biochemical oxygen demand (COD) content is 50-80 mg/L.
Preferably, the electrolyte comprises an anolyte and a catholyte, and the anolyte comprises the following components: glucose 60-100 mg/L, phosphate buffer solution 75-100 mg/L, trace element mixed solution 1.0mL/L, vitamin mixed solution 10mL/L, caCl 2 ·2H 2 O0.1 g/L and MgCl 2 ·6H 2 O0.1 g/L; the catholyte is the fresh water fishery cultivation tail water, namely the ammonia nitrogen content in the fresh water fishery cultivation tail water is 2-5 mg/L, the total nitrogen content is 8-14 mg/L, the nitrate content is 5-10 mg/L, the total phosphorus content is 1-3 mg/L, and the biochemical oxygen demand (COD) content is 50-80 mg/L.
In a second aspect, the invention provides a method for treating freshwater fishery culture tail water by using the microbial fuel cell constructed wetland system, which comprises the following steps:
pumping fresh water fishery culture tail water from the bottom of the microbial fuel cell artificial wetland system, sequentially treating the fresh water fishery culture tail water by a cobble layer, a first fine crushed stone layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine crushed stone layer, a second carbon cloth layer and a carbon-loaded electro-active bacteria algae biomembrane in the artificial wetland, and finally overflowing from the top of the microbial fuel cell artificial wetland system and discharging.
Compared with the prior art, the invention has the following beneficial effects:
the invention definitely and selectively screens blue algae and extracellular respiratory bacteria which can strengthen the treatment of the freshwater aquaculture tail water for the first time, and constructs to obtain an electroactive bacterial algae biomembrane, and simultaneously constructs to obtain a microbial fuel cell constructed wetland system by combining an electrical treatment mode of a constructed wetland coupling electrode, so that a microbial fuel cell is formed in continuous water flow, the growth of extracellular respiratory bacteria in the electroactive bacterial algae biomembrane is promoted, and the continuous high-efficiency degradation of carbon, nitrogen, phosphorus, antibiotics and heavy metals in the freshwater aquaculture tail water is realized, wherein the removal rate of COD, ammonia nitrogen, total phosphorus, antibiotics and copper ions in the freshwater aquaculture tail water by the constructed wetland containing the electroactive bacterial algae biomembrane respectively reaches 86.5%, 92.9%, 85.2%, 92.7% and 95.8%; the quality of the effluent reaches the drainage standard requirement. The method has the advantages of simple structure, flexible operation, quick start, stable operation, no aeration, low operation cost and the like.
Drawings
FIG. 1 is a schematic structural view of an artificial wetland according to the present invention;
FIG. 2 is a graph showing total phosphorus removal effect of a test group and a control group on the culture tail water;
FIG. 3 is a graph showing COD removal effect of the test group and the control group on the tail water of the cultivation;
FIG. 4 is a graph showing total nitrogen removal effect of the test group and the control group on the culture tail water;
FIG. 5 is a graph showing the effect of the test group and the control group on removing amino nitrogen and nitrate nitrogen in the tail water of cultivation.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
The test methods used in the examples are conventional methods unless otherwise specified; the materials, reagents and the like used, unless otherwise specified, are all commercially available.
Example 1
The embodiment provides an electroactive bacteria algae biological film for strengthening the treatment of freshwater fishery culture tail water, which is formed by mixed fermentation of cyanobacteria Cyanobium and extracellular respiratory bacteria Ottowia, and the construction method of the electroactive bacteria algae biological film comprises the following steps:
(1) Collecting microalgae from fresh water, separating blue algae cyanides, adding 10% (v: v) of fresh water fishery culture tail water into a Tris-Acetate-Phosphorus (TAP) culture medium for culturing blue algae, culturing the blue algae cyanides to a logarithmic growth phase, washing the blue algae cyanides for several times by distilled water, centrifuging for 10min at 8000r/min, and collecting blue algae suspension, wherein the biomass of the blue algae cyanides in the blue algae suspension is 0.2-0.3 g/L; wherein the component content of TAP medium is shown in Table 1.
TABLE 1 composition of TAP Medium
| Composition of the components | Content of | Composition of the components | Content of |
| H 2 NC(CH 2 OH) 3 | 5mL/L | H 3 BO 3 | 0.11g/L |
| NH 4 Cl | 15g/L | MnCl 2 ·4H 2 O | 0.05g/L |
| CaCl 2 ·2H 2 O | 2g/L | FeSO 4 ·7H 2 O | 0.05g/L |
| MgSO 4 ·7H 2 O | 4g/L | CoCl 2 ·6H 2 O | 0.016g/L |
| K 2 HPO 4 | 2.88g/L | CuSO 4 ·5H 2 O | 0.016g/L |
| KH 2 PO 4 | 1.44g/L | (NH 4 ) 6 Mo 7 O 24 ·4H 2 O | 0.011g/L |
| Na 2 EDTA·2H 2 O | 0.5g/L | CH 3 COOH | 5mL/L |
| ZnSO 4 ·7H 2 O | 0.2g/L | —— | —— |
(2) The microbial fuel cell is used as a culture carrier of the extracellular respiratory bacteria Ottomia to culture and enrich the extracellular respiratory bacteria, and the method is concretely as follows:
the microbial fuel cell of the embodiment comprises a 500mL wide-mouth bottle, a carbon cloth anode, a stainless steel mesh cathode and a series 1000 European resistor, wherein fresh water fishery culture tail water is used as catholyte of the microbial fuel cell, and the anolyte of the microbial fuel cell comprises the following components:
glucose 60-100 mg/L, phosphate Buffer Solution (PBS) 10-40 mL/L, trace element mixed solution 1.0mL/L, vitamin mixed solution 10mL/L, caCl 2 ·2H 2 O0.1 g/L and MgCl 2 ·6H 2 O0.1 g/L. The formulations of the phosphate buffer solution, the trace element mixed solution and the vitamin mixed solution are shown in tables 2, 3 and 4 respectively.
TABLE 2 phosphate buffer (50 mM) formulation
| Composition of the components | Concentration (g/L) | Composition of the components | Concentration (g/L) |
| NH 4 Cl | 0.31 | NaH 2 PO 4 ·2H 2 O | 3.32 |
| KCl | 0.13 | Na 2 HPO 4 ·12H 2 O | 10.32 |
Table 3 microelement liquid formulation
| Composition of the components | Concentration (g/L) | Composition of the components | Concentration (g/L) |
| H 3 BO 3 | 0.05 | NiCl 2 | 0.2 |
| CuCl 2 ·2H 2 O | 0.03 | ZnCl 2 | 0.05 |
| MnSO 4 ·H 2 O | 0.05 | (NH 4 )Mo 7 O 24 ·4H 2 O | 0.05 |
| CoCL 2 ·6H 2 O | 0.2 | AlCl·6H 2 O | 0.05 |
| Concentrated HCl | 1mL/L | FeCl 2 ·4H 2 O | 2.0 |
Table 4 vitamin liquid formulation
Inoculating extracellular respiratory bacteria Ottomia into anode liquid and cathode liquid of a microbial fuel cell respectively, wherein the inoculum size is 10% (v: v), operating in an intermittent culture mode, and replacing the electrode liquid when the COD removal rate reaches more than 80% and the voltage is reduced to below 50mV, sucking the old electrode liquid through a syringe and a 0.22 mu m filter membrane in the replacement process, injecting new electrode liquid, and retaining strains in the replacement process, wherein only the electrode liquid is replaced. When the output voltage generated by the MFC is stabilized above 300mV, the enrichment and domestication of the extracellular respiratory bacteria are completed, and the electrode liquid is collected to obtain the sludge suspension containing the extracellular respiratory bacteria, wherein the biomass of the extracellular respiratory bacteria sludge Ottomia is 0.1-0.5 g/L.
Mixing blue algae suspension and sludge suspension according to a dry weight ratio of 1:0.2-0.5, and carrying out mixed culture in fresh water fishery culture tail water for 30-45 days under the conditions of 4h illumination, 20h photoperiod illumination period and room temperature (25-27 ℃) to construct the electroactive bacterial algae biomembrane, wherein the illumination light source is a light-emitting diode, and the illumination intensity in the mixed culture process is 92.27 mu mol.m -2 s -1 。
Example 2
The embodiment provides a microbial fuel cell constructed wetland system for strengthening freshwater aquaculture tail water treatment and a method for treating freshwater aquaculture wastewater based on the microbial fuel cell constructed wetland system.
The invention relates to a microbial fuel cell constructed wetland system for strengthening freshwater fishery culture wastewater treatment, which is shown in figure 1, wherein the constructed wetland comprises a cobble layer, a first fine crushed stone layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine crushed stone layer, a second carbon cloth layer and a carbon-carried electroactive bacteria algae biological film from bottom to top in sequence; the first carbon cloth layer and the second carbon cloth layer are connected through conductive wires. The thickness of the cobble layer is 0.2m, the thickness of the first fine crushed stone layer is 0.3m, the total thickness of the columnar activated carbon layer and the first carbon cloth layer is 0.3m, the thickness of the second crushed stone layer is 0.2m, the thickness of the second carbon cloth layer is 5-10 mm, and the thickness of the carbon-loaded electroactive bacteria algae biological film is 0.1-0.2 m.
According to the invention, the first carbon cloth layer is connected with the second carbon cloth layer through an external circuit, so that a Microbial Fuel Cell (MFC) is formed in continuous water flow, the growth of extracellular respiratory bacteria in an electroactive bacteria algae biomembrane in the constructed wetland is promoted, and the function of continuously purifying the fresh water fishery aquaculture tail water is further achieved.
The method for treating the freshwater fishery culture tail water by utilizing the microbial fuel cell constructed wetland system comprises the following steps:
the fresh water fishery culture tail water is pumped from the bottom of the artificial wetland, and then sequentially treated by a cobble layer, a first fine crushed stone layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine crushed stone layer, a second carbon cloth layer and a carbon-loaded electro-active bacteria algae biomembrane in the artificial wetland, and finally overflowed from the top of the artificial wetland and is discharged.
The constructed artificial wetland containing the electroactive bacteria and algae biomembrane is used for treating the freshwater fishery aquaculture tail water as a test group (BA-MFC-CW), the tail water overflows from the bottom of the artificial wetland, and pollutants are removed under the combined action of the artificial wetland and the electroactive bacteria and algae biomembrane. Meanwhile, a control group 1 (MFC-CW) containing only extracellular respiratory bacteria Ottomia and a control group 2 (BA-CW) containing only blue algae are used as blank groups (CW), and the rest parts which are not described are the same as test groups.
The test results of the test group and the control group on the total nitrogen removal rate, the ammonia nitrogen removal rate, the nitrate nitrogen removal rate and the COD removal rate in the fresh water fishery cultivation tail water treatment are shown in figures 2 to 5 in sequence, and the results are shown in table 5 after 120 days of operation to count the removal rates of COD, total phosphorus, total nitrogen, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, sulfonamide antibiotics and copper ions in the cultivation tail water.
Table 5 comparison of removal rates of experimental and control groups
| Removal rate (%) | COD | Total phosphorus | Total nitrogen | Ammonia nitrogen | Nitrate nitrogen | Antibiotics | Copper ions |
| BA-MFC-CW | 86.5％ | 92.7％ | 85.2％ | 92.9％ | 93.3％ | 92.7％ | 95.8％ |
| CW | 61.6％ | 53.5％ | 67.4％ | 56.1％ | 61.1％ | 64.8％ | 62.3％ |
| MFC-CW | 83.4％ | 66.6％ | 77.2％ | 74.5％ | 82.7％ | 88.9％ | 85.3％ |
| BA-CW | 67.7％ | 85.2％ | 72.7％ | 65.5％ | 72.3％ | 76.7％ | 84.4％ |
As can be seen from the results of Table 5 and the accompanying figures 2-5, compared with the blank group and the control groups 1 and 2, the test group has better effect of degrading carbon, nitrogen, phosphorus, antibiotics and heavy metals in the culture wastewater, and the freshwater fishery culture tail water treated by the artificial wetland containing the electro-active bacterial algae biomembrane reaches the second-class discharge standard of the culture wastewater.
Example 3
In this example, the following combination of cyanobacteria and extracellular respiratory bacteria was used to construct a corresponding electroactive bacterial algae biofilm by referring to the method for constructing an electroactive bacterial algae biofilm described in example 1.
Control group 1: cyanobacteria cyanides+extracellular respiratory bacteria Geobater;
control group 2: cyanobacteria cyanbium+ extracellular respiratory bacteria Shewanella;
control group 3: cyanobacteria microcystis+ extracellular respiratory bacteria Ottowia;
control group 4: blue algae Basketballagae+extracellular respiratory bacteria Ottomia;
control group 5: cyanobacteria Microcystis + extracellular respiratory bacteria Geobacter;
control group 6: cyanobacteria Microcystis + extracellular respiratory bacteria Shewanella;
control group 7: blue algae Basketballagae+extracellular respiratory bacteria Geobactor;
control group 8: blue algae Basketballagae+extracellular respiratory bacteria Shewanella.
The results of the water purification test of the blue algae and extracellular respiratory bacteria combined in the above control groups 1 to 8 by constructing a corresponding electroactive bacterial algae biofilm according to the method described in example 1, and by constructing an artificial wetland using the bacterial algae biofilm and treating the fresh water fishery aquaculture tail water using the corresponding artificial wetland according to example 2 are shown in table 6.
TABLE 6 comparison of Water treatment effects of electroactive bacteria/algae biofilms formed by different cyanobacteria and extracellular respiratory bacteria combinations
Compared with the electroactive bacteria algae biological film formed by other blue algae and extracellular respiratory bacteria, the electroactive bacteria algae biological film formed by the blue algae Cyanobium and extracellular respiratory bacteria Ottowia shows better total nitrogen removal rate, copper ion removal rate and antibiotic removal rate for the treatment of the freshwater aquaculture tail water when being combined with an artificial wetland, and has overall advantages, so that the electroactive bacteria algae biological film provided by the invention is more suitable for the purification treatment of the freshwater aquaculture tail water.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The microbial fuel cell artificial wetland system for strengthening the treatment of the freshwater fishery culture tail water is characterized by sequentially comprising a cobble layer, a first fine crushed stone layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine crushed stone layer, a second carbon cloth layer and a carbon-loaded electroactive bacteria algae biological film from bottom to top; the first carbon cloth layer and the second carbon cloth layer are connected through conductive wires;
the electroactive bacteria algae biological film is formed by mixing and culturing blue algae and extracellular respiratory bacteria; the blue algae is blue fungus genus Cyanobium, and the extracellular respiratory bacteria is Ottowia.
2. The microbial fuel cell constructed wetland system for strengthening the treatment of freshwater aquaculture tail water according to claim 1, wherein the thickness of the cobble layer is 0.1-0.3 m, the thickness of the first fine crushed stone layer is 0.2-0.4 m, the total thickness of the columnar activated carbon layer and the first carbon cloth layer is 0.2-0.4 m, the thickness of the second fine crushed stone layer is 0.1-0.2 m, the thickness of the second carbon cloth layer is 5-10 mm, and the thickness of the carbon-loaded electroactive bacteria algae biomembrane is 0.1-0.2 m.
3. The microbial fuel cell constructed wetland system for strengthening the treatment of freshwater aquaculture tail water according to claim 1, wherein said electroactive bacterial algae biofilm is prepared by the following method:
(1) Culturing the cyanobacterium in a culture medium to a logarithmic growth phase to obtain a cyanobacterium suspension, wherein the biomass of the cyanobacterium in the cyanobacterium suspension is 0.2-0.3 g/L;
(2) Inoculating extracellular respiratory bacteria Ottomia to electrode liquid of a microbial fuel cell, finishing enrichment and domestication of the extracellular respiratory bacteria when the output voltage of the microbial fuel cell is more than 300mV, and collecting the electrode liquid to obtain a sludge suspension containing the extracellular respiratory bacteria, wherein the biomass of the extracellular respiratory bacteria in the sludge suspension is 0.1-0.5 g/L;
(3) Mixing the blue algae suspension and the sludge suspension according to a dry weight ratio of 1:0.2-0.5, and carrying out mixed culture in fresh water fishery culture tail water for 30-45 days under the conditions of 4h illumination, 20h photoperiod illumination period and room temperature to construct the electroactive bacteria algae biomembrane.
4. The microbial fuel cell artificial wetland system for strengthening the treatment of freshwater aquaculture tail water according to claim 3, wherein in the step (1), 10% -30% (v: v) of freshwater aquaculture tail water is added into a culture medium for culturing the cyanobacteria, the ammonia nitrogen content in the freshwater aquaculture tail water is 2-5 mg/L, the total nitrogen content is 8-14 mg/L, the nitrate content is 5-10 mg/L, the total phosphorus content is 1-3 mg/L, and the biochemical oxygen demand content is 50-80 mg/L.
5. According to claimThe microbial fuel cell constructed wetland system for strengthening the treatment of freshwater fishery culture tail water is characterized in that the electrode liquid comprises an anode liquid and a cathode liquid, and the anode liquid comprises the following components: glucose 60-100 mg/L, phosphate buffer solution 75-100 mg/L, trace element mixed solution 1.0mL/L, vitamin mixed solution 10mL/L, caCl 2 ·2H 2 O0.1 g/L and MgCl 2 ·6H 2 O0.1 g/L; the catholyte is the freshwater fish culture tail water of claim 4.
6. A method for treating fresh water fishery aquaculture tail water by using the microbial fuel cell constructed wetland system of claim 1, which is characterized by comprising the following steps:
pumping fresh water fishery culture tail water from the bottom of the microbial fuel cell artificial wetland system, sequentially treating the fresh water fishery culture tail water by a cobble layer, a first fine gravel layer, a columnar activated carbon layer, a first carbon cloth layer, a second fine gravel layer, a second carbon cloth layer and a carbon-loaded electro-active bacteria algae biomembrane, and finally overflowing from the top of the microbial fuel cell artificial wetland system and discharging.
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