Algae removal and nutrient element collaborative treatment device and method

Abstract

The invention discloses an algae removal and nutrient element cooperative treatment device and method, and relates to the technical field of algae removal and nutrient element cooperative treatment, and the technical scheme is characterized in that the device comprises an algae liquid pretreatment chamber, a nutrient element enhanced removal chamber and an algae degradation chamber, a diaphragm is arranged between the algae liquid pretreatment chamber and the algae degradation chamber, and the diaphragm is arranged between the algae liquid pretreatment chamber and the algae degradation chamber; and a diaphragm is arranged between the nutrient element enhanced removal chamber and the algae degradation chamber. The method has the synergistic effects of efficiently removing algae, strengthening nutrient element treatment and recovering energy, the operation process is green and low-carbon, and the method is suitable for comprehensive treatment of algae bloom water bodies such as lakes and reservoirs.

Description

Technical Field

[0001] The present invention relates to the technical field of algae removal and nutrient element coordinated management, and more specifically, to an algae removal and nutrient element coordinated management device and method. Background Art

[0002] Eutrophication of water bodies is one of the main problems of global water resource pollution. Its core is that excessive nutrients such as nitrogen and phosphorus in water bodies lead to excessive reproduction of algae, which in turn causes algal blooms. Algal blooms not only destroy the ecological balance of water bodies, but may also cause a rapid drop in dissolved oxygen and large-scale death of aquatic organisms. In addition, some algae (such as cyanobacteria) will release algal toxins, which seriously threaten the ecological environment and human health. More importantly, after the death of algae, the organic matter and nutrients released by their cell rupture will further aggravate the eutrophication of water bodies, which may lead to repeated outbreaks of algal blooms and form a vicious circle. Therefore, how to effectively remove algae and simultaneously process the nutrients they release has become a key technical problem in solving the eutrophication of water bodies.

[0003] At present, algae control technologies mainly include three major methods: chemical, physical and biological. Chemical methods quickly kill algae by adding copper sulfate, hydrogen peroxide and other agents. Although the effect is fast, it is easy to cause secondary pollution, and there are also high costs and safety hazards. Physical methods such as filtration, shading and ultrasonic technology are suitable for small-scale control, but the energy consumption is high and the equipment cost is high, making it difficult to promote in large-scale water bodies. Biological methods are more environmentally friendly and have long-lasting effects by introducing filter-feeding organisms or functional microorganisms, but the reaction time is long and is greatly restricted by environmental conditions, making it difficult to meet emergency control needs. Although the above technologies have their own advantages, their common shortcomings are that they cannot simultaneously solve the problem of removing algae and simultaneously controlling the release of nutrients after death. Nutrients such as nitrogen and phosphorus released after the death of algae will re-enter the water cycle and become the "hotbed" for the next round of algal blooms. In addition, the energy utilization efficiency of existing technologies is low, and they usually fail to combine algae control with energy recovery, resulting in high operating costs.

[0004] As an emerging pollutant control and energy recovery technology, MFCs have attracted much attention in the field of water treatment in recent years. MFCs use electroactive microorganisms to degrade organic pollutants in water and generate electricity, which has the advantages of being green, environmentally friendly, efficient and low-cost. However, current research based on MFCs is mostly focused on the field of sewage treatment, and its application in algae removal and simultaneous nutrient element treatment is still immature, especially in achieving the synergistic effect of algae removal, nutrient element treatment and energy recovery. In view of this, the inventors propose a device and method for the coordinated treatment of algae removal and nutrient elements. Summary of the invention

[0005] The purpose of the present invention is to provide an algae removal and nutrient element coordinated control device and method, with algae removal, nutrient element removal and energy recovery as the core goals, to form a green, efficient and low-carbon comprehensive control method, and ultimately achieve comprehensive control of algae bloom water bodies.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] The first aspect of the present invention provides an algae removal and nutrient element coordinated control device and method, including an algae liquid pretreatment chamber, a nutrient element enhanced removal chamber and an algae degradation chamber, a diaphragm is provided between the algae liquid pretreatment chamber and the algae degradation chamber, and a diaphragm is provided between the nutrient element enhanced removal chamber and the algae degradation chamber.

[0008] In combination with the first aspect, the present invention is further configured as follows: it also includes a wire, a first resistor and a second resistor, and the algae pretreatment chamber, the algae degradation chamber and the nutrient element enhanced removal chamber are respectively provided with a first cathode electrode, an anode electrode and a second cathode electrode, the wire connects the first cathode electrode, the first resistor and the anode electrode in series to form a first current loop, and the wire connects the second cathode electrode, the second resistor and the anode electrode in series to form a second current loop.

[0009] The first cathode electrode in the algae pretreatment chamber is an electrode such as carbon felt, carbon rod, carbon granules or carbon cloth, which is conducive to the electrochemical reduction of oxygen to generate hydrogen peroxide. The anode electrode in the algae degradation chamber and the second cathode electrode in the nutrient element enhanced removal chamber are electrodes such as carbon felt, carbon brush, carbon granules or carbon cloth, which are conducive to the attachment of microorganisms. The wire is copper wire, aluminum wire or titanium wire.

[0010] In combination with the first aspect, the present invention is further configured as follows: the diaphragm is a cation exchange membrane, an anion exchange membrane or a bipolar membrane.

[0011] In combination with the first aspect, the present invention is further configured as follows: a first air inlet is provided at one end of the algae liquid pretreatment chamber away from the algae degradation chamber, a first water outlet is provided at the top of the algae liquid pretreatment chamber, and a first water inlet is also provided on the side of the algae liquid pretreatment chamber.

[0012] In combination with the first aspect, the present invention is further configured as follows: a second water outlet is provided on the top of the algae degradation chamber, and a second water inlet is provided on the side of the algae liquid pretreatment chamber.

[0013] In combination with the first aspect, the present invention is further configured as follows: a second air inlet is provided at one end of the nutrient element enhanced removal chamber away from the algae degradation chamber, a third water outlet is provided at the top of the algae liquid pretreatment chamber, and a third water inlet is provided on the side of the algae liquid pretreatment chamber.

[0014] In combination with the first aspect, the present invention is further configured as follows: a second air inlet is provided at one end of the nutrient element enhanced removal chamber away from the algae degradation chamber, a third water outlet is provided at the top of the nutrient element enhanced removal chamber, and a third water inlet is provided on the side of the nutrient element enhanced removal chamber.

[0015] In combination with the first aspect, the present invention is further configured as follows: the first cathode liquid is river water, lake water, reservoir water or pond water containing algae; the inoculum of the electroactive microorganisms and nutrient element enhanced removal microorganisms is the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant; the anolyte is composed of: 1g / L sodium acetate; 0.1g / L Microcystis aeruginosa algae powder; 0.15g / L potassium sulfate; 50mM HEPES buffer (pH=7.4); trace elements 1mL / L; the trace element composition in the algae degradation chamber is: MgSO4: 3.0g / L; MnSO4·H2O: 0.5g / L; NaCl: 1.0g / L; FeSO4·7H2O: 0.1g / L; CaCl2·2H2O: 0.1g / L; CoCl2·6H2O: 0.1g / L; ZnC l2:0.13g / L; CuSO4·5H2O:0.01g / L; KAl(SO4)2·12H2O:0.01g / L; H3BO3:0.01g / L; Na2MoO4:0.025g / L; NiCl2·6H2O:0.024g / L; Na2WO4·2H2O:0.024g / L; the second cathode liquid is: NaHCO3:1g / L; NH4C l:0.18g / L; 50mM HEPES buffer (pH=7.4); trace elements 12.5mL / L; the trace element composition in the nutrient element enhanced removal chamber is the same as the trace element composition in the algae degradation chamber.

[0016] The second aspect of the present invention also provides a method for the coordinated management of algae removal and nutrient elements, comprising the following steps:

[0017] S1. Start the device. Add the first cathode liquid to the algae pretreatment chamber, and use a peristaltic pump to introduce air or oxygen into the algae pretreatment chamber through the first air inlet at a flow rate of 1-100mL / min; add the anolyte liquid to the algae degradation chamber, and inoculate the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant; add the second cathode liquid to the nutrient element enhanced removal chamber, inoculate the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant, and use a peristaltic pump to intermittently introduce air into the nutrient element enhanced removal chamber through the second air inlet at a flow rate of 1-100mL / min;

[0018] S2. To acclimate the electroactive microorganisms and the nutrient element enhanced removal microorganisms, under closed-circuit conditions, place the above three chambers at room temperature of 24℃-28℃ for acclimation and operation; the replacement cycle of the first cathode liquid, the anode liquid and the second cathode liquid is 2-4d. When the output voltage of the first current loop and the second current loop is stable at a similar value for at least 3 consecutive cycles, it indicates that the electroactive microorganisms in the algae degradation chamber and the nutrient element enhanced removal microorganisms in the nutrient element enhanced removal chamber have been successfully acclimated and started.

[0019] S3. Run the device, and replace the first cathode liquid in step S1 with 2.0×10 9 / L Microcystis aeruginosa and 0.066g / L NaCl solution. After the device has been running for 2-4 days, the anolyte is replaced with the treated first cathode liquid, and the replaced first cathode liquid is replenished. After the device continues to run for 2-4 days, the second cathode liquid is replaced with the treated anolyte and 1g / LNaHCO3 and 12.5mL / L trace elements. At the same time, the treated first cathode liquid is injected into the algae degradation chamber, and the replaced first cathode liquid is replenished. Repeat this operation and run continuously with 2-4 days as the operation cycle.

[0020] In combination with the second aspect, the present invention is further configured as follows: the air or oxygen in the first air inlet is continuously inhaled, and the air intake rate is 40-80mL / min; the air or oxygen in the second air inlet is intermittently inhaled, and the air intake rate is 40-80mL / min, the air intake time is 0.1-7200min, and the air intake stop time is 0.1-7200min.

[0021] In summary, the present invention has the following beneficial effects:

[0022] (1) Three chambers work synergistically and achieve efficient algae removal: the algae pretreatment chamber generates hydrogen peroxide in situ to quickly inactivate algae; the algae degradation chamber extracts chemical energy from the organic matter of dead algae to achieve energy self-sufficiency; the nutrient element enhanced removal chamber enhances nitrogen and phosphorus removal. The three chambers have clear division of labor and work synergistically and efficiently.

[0023] (2) Green and low-carbon operation, taking into account energy recovery: The system uses electroactive microorganisms to metabolize algae organic matter to provide electricity, support the electrochemical production of hydrogen peroxide, and achieve electricity recovery at the same time. It does not require additional carbon sources or external electricity, and has low energy consumption and is environmentally friendly.

[0024] (3) Strengthen nitrogen and phosphorus removal and prevent secondary pollution: The nitrogen and phosphorus nutrients in the water body are further removed through the nutrient element enhanced removal chamber, inhibiting the secondary pollution caused by the release of nutrients after the death of algae, ensuring the long-term stability of the treatment effect.

[0025] (4) Modular design and wide applicability: The device adopts a modular structure design, and the operating parameters can be adjusted according to the degree of pollution and the scale of treatment. It can be flexibly applied to the treatment of different types of eutrophic water bodies (such as lakes and reservoirs), especially in the wild and remote areas. It has significant application potential and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a three-chamber MFCs device;

[0027] Figure 2 is the change of the amount of hydrogen peroxide generated in the algae pretreatment chamber of Example 1 over time;

[0028] Figure 3 is the change of the maximum light quantum efficiency (Fv / Fm) of algae in the algae pretreatment chamber of Example 1 over time;

[0029] Figure 4 is the change of ammonia nitrogen and total nitrogen concentrations over time in the algae pretreatment chamber of Example 1;

[0030] Figure 5 is the change of total phosphorus concentration in the algae pretreatment chamber of Example 1 over time;

[0031] Figure 6 is the change of ammonia nitrogen and total nitrogen concentration over time in the algae degradation chamber of Example 1;

[0032] Figure 7 is the change of total phosphorus concentration over time in the algae degradation chamber of Example 1;

[0033] Figure 8 is the change of ammonia nitrogen and total nitrogen concentrations over time in the nutrient element enhanced removal chamber of Example 1;

[0034] Fig. 9 is the change of total phosphorus concentration in the nutrient element enhanced removal chamber of Example 1 over time;

[0035] Fig.10 is the output power density of the three-chamber MFCs of Example 1.

[0036] In the figure: 1 algae liquid pretreatment chamber; 2 first water inlet; 3 first cathode electrode; 4 first air inlet; 5 wire; 6 first water outlet; 7 first resistor; 8 second resistor; 9 second water outlet; 10 third water outlet; 11 second air inlet; 12 third water inlet; 13 second cathode electrode; 14 nutrient element enhanced removal chamber; 15 diaphragm; 16 second water inlet; 17 anode electrode; 18 algae degradation chamber. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] Step 1: Construct a three-chamber MFCs device, such as Figure 1 The algae pretreatment chamber 1, the algae degradation chamber 18 and the nutrient element enhanced removal chamber 14 are all made of organic glass. The three reaction chambers have the same specifications, with a cubic structure on the outside and a cylindrical cavity on the inside. The volume of each chamber is 50 mL and is separated by a diaphragm 15 cation exchange membrane (CM I-7000).

[0040] The first water inlet 2, the first air inlet 4, the first water outlet 6 of the algae pretreatment chamber, the second water inlet 16, the second water outlet 9 of the algae degradation chamber and the third water inlet 12, the second air inlet 11, the third water outlet 10 of the nutrient element enhanced removal chamber are all straight-through air pipe quick connectors with an inner diameter of 4 mm.

[0041] Step 2: Set up electrodes and current loops. The first cathode electrode 3 (carbon rod and carbon felt), the anode electrode 17 (carbon rod and carbon felt) and the second cathode electrode 13 (carbon rod and carbon felt) are placed in the algae pretreatment chamber 1, the algae degradation chamber 18 and the nutrient element enhanced removal chamber 14, respectively. The apparent size of the carbon rod (Beijing Sanye Carbon Materials Co., Ltd.) is The carbon felt (Beijing Sanye Carbon Material Co., Ltd.) has an apparent size of 3.0 cm × 1.5 cm × 1.0 cm. The first cathode electrode 3, the first resistor 7 and the anode electrode 17 are connected in series by a wire 5 (copper wire) to form a first current loop, and the second cathode electrode 13, the second resistor 8 and the anode electrode 17 are also connected in series to form a second current loop. In the device startup stage, the first resistor 7 and the second resistor 8 are both set to 1000Ω; in the device operation stage, the first resistor 7 and the second resistor 8 are both set to 50Ω.

[0042] Step 3: Start the device. Add 40 mL of the first cathode liquid into the algae pretreatment chamber 1, the composition of which is: NaCl: 0.066 g / L, and use a peristaltic pump to introduce air into the algae pretreatment chamber 1 through the first air inlet 4 at a flow rate of 60 mL / min. 30 mL of anolyte was added to the algae degradation chamber 18, and its composition was: 1 g / L sodium acetate; 0.1 g / L Microcystis aeruginosa powder; 0.15 g / L potassium sulfate; 50 mM HEPES buffer (pH = 7.4); trace elements 1 mL / L (composition: MgSO4: 3.0 g / L; MnSO4·H2O: 0.5 g / L; NaCl: 1.0 g / L; FeSO4·7H2O: 0.1 g / L; CaCl2·2H2O: 0.1 g / L; CoCl2·6H2O: 0.1 g / L; ZnCl2: 0.13 g / L; CuSO4·5H2O: 0.01 g / L; KAl(SO4)2·12H2O: 0.01 g / L; H3BO3: 0.01 g / L; Na2MoO4: 0.025 g / L; N i Cl2·6H2O: 0.024g / L; Na2WO4·2H2O: 0.024g / L), inoculated with 10g of oxidation ditch sludge from Chaoyang Sewage Treatment Plant in Nanchang. 30mL of the second cathode liquid was added to the nutrient element enhanced removal chamber 14, and its composition was: NaHCO3: 1g / L; NH4C l: 0.18g / L; 50mM HEPES buffer (pH=7.4); 12.5mL / L of trace elements (the same composition as above), inoculated with 10g of oxidation ditch sludge from Chaoyang Sewage Treatment Plant in Nanchang, and at the same time, a peristaltic pump was used to intermittently introduce air into the nutrient element enhanced removal chamber 11 through the second air inlet 11 at a flow rate of 60mL / min. The period of intermittent ventilation was 6h, and ventilation was continued for 3h first, and then ventilation was stopped for 3h.

[0043] Step 4: Domesticate the electroactive microorganisms and nutrient element enhanced removal microorganisms. Under closed-circuit conditions, place the three-chamber MFCs device at room temperature of 26±2°C for domestication and operation. The replacement cycle of the first cathode liquid, the anode liquid and the second cathode liquid is 3 days. When the output voltage of the first current loop and the second current loop is stable at a similar value for at least 3 consecutive cycles, it indicates that the electroactive microorganisms in the algae degradation chamber 18 and the nutrient element enhanced removal microorganisms in the nutrient element enhanced removal chamber 14 have been successfully domesticated and started.

[0044] Step 5: Run the device. Replace the first cathode solution in step 3 with 40 mL of 2.0×10 9 / L Microcystis aeruginosa and 0.066g / L NaCl. After the device has been running for 2 days, the anolyte is replaced with the treated first cathode liquid, and the replaced first cathode liquid is supplemented at the same time. After the device continues to run for 2 days, the second cathode liquid is replaced with the treated anolyte and 1g / LNaHCO3 and 12.5mL / L trace elements (the composition is the same as above), and the treated first cathode liquid is injected into the algae degradation chamber 18 at the same time, and the replaced first cathode liquid is supplemented. According to this operation, it is continuously operated with a 2d operation cycle. After the device has been running for 5 cycles, samples are taken regularly to analyze the hydrogen peroxide concentration, algae maximum light quantum efficiency (Fv / Fm), ammonia nitrogen concentration, total nitrogen concentration and total phosphorus concentration in the algae pretreatment chamber 1, analyze the ammonia nitrogen concentration, total nitrogen concentration and total phosphorus concentration in the algae degradation chamber 18, and analyze the ammonia nitrogen concentration, total nitrogen concentration and total phosphorus concentration in the nutrient element enhanced removal chamber 14.

[0045] Step 6: Characterize the power generation performance of the device. In the 10th cycle of the device operation, the output power of the MFCs composed of anode-first cathode and the MFCs composed of anode-second cathode were characterized by linear sweep voltammetry.

[0046] Comparative Example 1:

[0047] The three-chamber MFCs device in this comparative example is operated under open circuit conditions, that is, the first current loop between the anode electrode 17 and the first cathode electrode 3 in step 5 of Example 1 is disconnected and not connected; at the same time, the second current loop between the anode electrode 17 and the second cathode electrode 13 is disconnected and not connected. The remaining operating conditions are consistent with Example 1.

[0048] Results: During one cycle of the three-chamber MFCs device, the hydrogen peroxide concentration in the algae pretreatment chamber increased rapidly to 3.14±0.16 mg / L, then gradually decreased and stabilized at around 2.70 m / L; however, no hydrogen peroxide generation was observed under open circuit conditions ( Figure 2 ). This indicates that the three-chamber MFCs device can electrochemically generate hydrogen peroxide by extracting energy from algae biomass through electroactive microorganisms. The maximum photon efficiency (Fv / Fm) of algae gradually decreased from the initial 0.33±0.01 to 0, while under open circuit conditions, the maximum photon efficiency (Fv / Fm) of algae did not change significantly ( Figure 3 ), indicating that the algae were rapidly inactivated by the electrochemical generation of hydrogen peroxide. At the same time, the concentrations of ammonia nitrogen and total nitrogen in the algae pretreatment chamber gradually increased, reaching 4.94±0.62mg / L and 41.18±1.06mg / L at 48h, respectively, which were significantly higher than 3.35±0.19mg / L and 7.63±0.25mg / L under open circuit ( Figure 4The total phosphorus concentration also gradually increased to 6.56±0.50 mg / L at 48 h, which was also significantly higher than 0.95±0.23 mg / L under open circuit ( Figure 5 ). These results indicate that electrochemically generated hydrogen peroxide can promote the release of nitrogen and phosphorus nutrients from algae.

[0049] In the algae degradation chamber, the ammonia nitrogen concentration was reduced from 4.94±0.10mg / L to 1.57±0.10mg / L (removal rate: 68.1%, Figure 6 ), the total nitrogen concentration decreased from 40.53±0.74mg / L to 12.22±1.61mg / L (removal rate: 69.9%, Figure 6 ), the total phosphorus concentration decreased from 6.55±0.13mg / L to 5.43±0.13mg / L (removal rate: 17.1%, Figure 7 ). These results show that the algae degradation chamber has a certain ability to remove nitrogen and phosphorus nutrients, and its ability to remove nitrogen is significantly better than that of phosphorus.

[0050] In the nutrient element enhanced removal chamber, the ammonia nitrogen concentration was reduced from 1.57±0.10mg / L to 0.01±0.02mg / L (removal rate: 99.4%, Figure 8 ), the total nitrogen concentration decreased from 12.22±0.65mg / L to 3.91±0.31mg / L (removal rate: 67.9%, Figure 8 ), the total phosphorus concentration decreased from 5.43±0.12mg / L to 0.26±0.06mg / L (removal rate: 95.2%, Fig. 9 ). These results show that the nutrient element enhanced removal chamber has a very high removal capacity for nitrogen and phosphorus.

[0051] In addition, the maximum output power of the MFCs composed of anode-first cathode and anode-second cathode was 28.5 mW / m 2 and 23.6mW / m 2 ( Fig.10 At the same time, under closed-circuit conditions, the concentrations of ammonia nitrogen, total nitrogen, and total phosphorus in the effluents of the algae degradation chamber and the nutrient element enhanced removal chamber were lower than those under open-circuit conditions ( Figure 6-Figure 9 ).

[0052] The above results indicate that the three-chamber MFCs device can effectively recycle chemical energy from algae and promote the removal of nitrogen and phosphorus nutrients.

[0053] Working principle:

[0054] The present invention includes three reaction units, namely, an algae pretreatment chamber, an algae degradation chamber and a nutrient element enhanced removal chamber. The algae pretreatment chamber is the chemical cathode of the MFCs, which reduces oxygen to generate hydrogen peroxide by an electrochemical method, thereby realizing rapid inactivation and pretreatment of algae; the algae degradation chamber is the biological anode of the MFCs, which uses electroactive microorganisms to further metabolize the algae organic matter produced in the algae pretreatment chamber, converts the chemical energy therein into electrical energy, provides energy for the chemical cathode to generate hydrogen peroxide, and partially removes the nitrogen and phosphorus nutrient elements in the water body; the nutrient element enhanced removal chamber is the biological cathode, which controls the oxygen concentration to continue to enhance the removal of nitrogen and phosphorus in the effluent of the algae degradation chamber, thereby avoiding secondary pollution.

[0055] During use, the first cathode liquid first enters the algae pretreatment chamber, where the algae are inactivated and pretreated by electrochemically generated hydrogen peroxide, releasing nutrients such as nitrogen and phosphorus, and forming an algae pretreatment liquid. Then, the algae pretreatment liquid enters the algae degradation chamber, where the algae organic matter is catalytically decomposed and generates electrical energy under the action of electroactive microorganisms. The electrical energy is used to electrochemically generate hydrogen peroxide in the algae pretreatment chamber, and some nitrogen and phosphorus are removed under the action of microorganisms. Finally, the effluent from the algae degradation chamber enters the nutrient element enhanced removal chamber, and 1g / LNaHCO3 and 12.5mL / L trace elements (composition is the same as above) are added, wherein the nitrogen element is enhanced by nitrification and denitrification under the condition of intermittent air or oxygen; phosphorus is enhanced by microbial assimilation and struvite precipitation under the action of microorganisms and magnesium ions in trace elements.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An algae removal and nutrient element coordinated treatment device, characterized by: It comprises an algae liquid pretreatment chamber, a nutrient element enhanced removal chamber and an algae degradation chamber, wherein a diaphragm is arranged between the algae liquid pretreatment chamber and the algae degradation chamber, and a diaphragm is arranged between the nutrient element enhanced removal chamber and the algae degradation chamber.

2. The algae removal and nutrient element coordinated treatment device according to claim 1 is characterized by: It also includes a wire, a first resistor and a second resistor. The algae pretreatment chamber, the algae degradation chamber and the nutrient element enhanced removal chamber are respectively provided with a first cathode electrode, an anode electrode and a second cathode electrode. The wire connects the first cathode electrode, the first resistor and the anode electrode in series to form a first current loop, and the wire connects the second cathode electrode, the second resistor and the anode electrode in series to form a second current loop.

3. The algae removal and nutrient element coordinated treatment device according to claim 1 is characterized by: The diaphragm is a cation exchange membrane, an anion exchange membrane or a bipolar membrane.

4. The algae removal and nutrient element coordinated treatment device according to claim 1 is characterized in that: A first air inlet is arranged at one end of the algae liquid pretreatment chamber away from the algae degradation chamber, a first water outlet is arranged at the top of the algae liquid pretreatment chamber, and a first water inlet is also arranged at the side of the algae liquid pretreatment chamber.

5. The algae removal and nutrient element coordinated treatment device according to claim 1 is characterized in that: A second water outlet is provided on the top of the algae degradation chamber, and a second water inlet is provided on the side of the algae liquid pretreatment chamber.

6. The algae removal and nutrient element coordinated treatment device according to claim 1 is characterized by: A second air inlet is arranged at one end of the nutrient element enhanced removal chamber away from the algae degradation chamber, a third water outlet is arranged at the top of the nutrient element enhanced removal chamber, and a third water inlet is arranged at the side of the nutrient element enhanced removal chamber.

7. The device for collaboratively treating algae removal and nutrient elements according to claim 1 is characterized by: The algae pretreatment chamber is filled with a first cathode liquid, the algae degradation chamber is filled with electroactive microorganisms and anodal liquid, and the nutrient element enhanced removal chamber is filled with nutrient element enhanced removal microorganisms and a second cathode liquid.

8. The device for collaboratively treating algae removal and nutrient elements according to claim 7 is characterized in that: The first cathode liquid is river water, lake water, reservoir water or pond water containing algae; the inoculum of the electroactive microorganisms and nutrient element enhanced removal microorganisms is the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant; the anolyte composition is: 1g / L sodium acetate; 0.1g / L Microcystis aeruginosa algae powder; 0.15g / L potassium sulfate; 50mM HEPES buffer (pH=7.4); trace elements 1mL / L; the trace elements in the algae degradation chamber are: MgSO4: 3.0g / L; MnSO4·H2O: 0.5g / L; NaCl: 1.0g / L; FeSO4·7H2O: 0.1g / L; CaCl2·2H2O: 0.1g / L; CoCl2·6H2O: 0.1g / L; ZnCl2: 0.13g / L; CuSO4·5H2O: 0.01g / L; KAl(SO4)2·12H2O: 0.01g / L; H3BO3: 0.01g / L; Na2MoO4: 0.025g / L; NiCl2·6H2O: 0.024g / L; Na2WO4·2H2O: 0.024g / L; the second cathode liquid is: NaHCO3: 1g / L; NH4Cl: 0.18g / L; 50mM HEPES buffer (pH=7.4); trace elements 12.5mL / L; the trace element composition in the nutrient element enhanced removal chamber is the same as the trace element composition in the algae degradation chamber.

9. A method for collaboratively treating algae removal and nutrient elements, using the device for collaboratively treating algae removal and nutrient elements according to any one of claims 1 to 8, characterized in that: The steps include: S1. Start the device. Add the first cathode liquid to the algae pretreatment chamber, and use a peristaltic pump to introduce air or oxygen into the algae pretreatment chamber through the first air inlet at a flow rate of 1-100mL / min; add the anolyte to the algae degradation chamber, and inoculate the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant; add the second cathode liquid to the nutrient element enhanced removal chamber, inoculate the sludge in the oxidation ditch of the oxidation ditch process sewage treatment plant, and use a peristaltic pump to intermittently introduce air into the nutrient element enhanced removal chamber through the second air inlet at a flow rate of 1-100mL / min; S2. Domesticate the electroactive microorganisms and the nutrient element enhanced removal microorganisms. Under closed-circuit conditions, place the above three chambers at room temperature of 24°C-28°C for domestication and operation; the replacement cycle of the first cathode liquid, the anode liquid and the second cathode liquid is 2-4 days. When the output voltages of the first current loop and the second current loop are stable at similar values ​​for at least 3 consecutive cycles, it indicates that the electroactive microorganisms in the algae degradation chamber and the nutrient element enhanced removal microorganisms in the nutrient element enhanced removal chamber have been successfully domesticated and started; S3. Run the device, and replace the first cathode liquid in step S1 with 2.0×10 9 / L Microcystis aeruginosa and 0.066g / LNaCl solution. After the device has been running for 2-4 days, the anolyte is replaced with the treated first cathode liquid, and the replaced first cathode liquid is replenished. After the device continues to run for 2-4 days, the second cathode liquid is replaced with the treated anolyte and 1g / LNaHCO3 and 12.5mL / L trace elements. At the same time, the treated first cathode liquid is injected into the algae degradation chamber, and the replaced first cathode liquid is replenished. Repeat this operation and continue to run with a cycle of 2-4 days.

10. The method for collaboratively controlling algae removal and nutrient elements according to claim 9, characterized in that: The air or oxygen in the first air inlet is continuously inhaled, and the air intake rate is 40-80mL / min; the air or oxygen in the second air inlet is intermittently inhaled, and the air intake rate is 40-80mL / min, the air intake time is 0.1-7200min, and the air intake stop time is 0.1-7200min.

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