CN107129025B - Forward osmosis microbial fuel cell combined wastewater treatment system and treatment method - Google Patents

Forward osmosis microbial fuel cell combined wastewater treatment system and treatment method Download PDF

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CN107129025B
CN107129025B CN201710456870.3A CN201710456870A CN107129025B CN 107129025 B CN107129025 B CN 107129025B CN 201710456870 A CN201710456870 A CN 201710456870A CN 107129025 B CN107129025 B CN 107129025B
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黄满红
黄丽
蔡腾
邓倩
牛飞虎
孟李君
陈海生
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    • C—CHEMISTRY; METALLURGY
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Abstract

The invention relates to a forward osmosis microbial fuel cell combined wastewater treatment system and a forward osmosis microbial fuel cell combined wastewater treatment method, wherein the forward osmosis microbial fuel cell comprises an anolyte side and a catholyte side, the anolyte side is an anode chamber, the catholyte side comprises a cathode chamber, a catholyte storage tank and a first peristaltic pump, the input end of the cathode chamber is sequentially connected with the first peristaltic pump and the catholyte storage tank through a catholyte input pipeline, the output end of the cathode chamber is connected with the catholyte storage tank through a catholyte output pipeline, electrodes of the anode chamber and the cathode chamber are fixed by titanium wires and are connected with an external resistor to form a loop, the anode chamber and the cathode chamber are separated by a forward osmosis membrane, and the forward osmosis membrane adopts a cellulose triacetate forward osmosis membrane and an active layer faces the anode chamber. The invention improves the removal efficiency of pollutants, has the advantages of good effluent quality, electric energy generation and the like, and can directly and effectively treat the landfill leachate.

Description

Forward osmosis microbial fuel cell combined wastewater treatment system and treatment method
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a forward osmosis microbial fuel cell combined wastewater treatment system and a treatment method.
Background
The landfill leachate contains a large amount of organic matters, the water quality change is large, the components are complex, the landfill leachate is organic wastewater which is difficult to treat, the treatment cost is high, and a high-efficiency and low-cost treatment technology is urgently needed. Forward Osmosis (FO) is a new membrane separation technology driven by concentration developed in recent years, and it relies on osmotic pressure difference between two sides of a permselective membrane as driving force to realize a membrane separation process of water transfer spontaneously (schlier et al, 2011). Microbial Fuel Cells (MFCs) are electrochemical reactors that convert energy in organic or inorganic substances into electrical energy using microbial metabolism. A forward Osmosis microbial fuel cell (OsMFC) is a device that combines FO with an MFC, converts chemical energy of organic matter into electrical energy using a microorganism as a catalyst, wherein water and ions in an anode permeate a selectively permeable membrane from a low osmotic pressure side (anode) to a high osmotic pressure side (cathode) driven by an osmotic pressure gradient. The OsMFC is applied to the field of wastewater treatment, can directly generate electric energy by taking organic pollutants in wastewater as fuel, and simultaneously realizes the purification of wastewater, thereby being a green technology with resource prospect. Membrane Distillation (MD) is a Membrane separation process that uses a hydrophobic microporous Membrane and uses the difference in vapor pressure across the Membrane as the drive for mass transfer. The membrane distillation is applied to the sea water desalination and pure water preparation, the food and traditional Chinese medicine industry, the chemical industry, the wastewater treatment and the like. The OsMFC is combined with the MD, so that the landfill leachate can reach the discharge standard, pollutants in the landfill leachate can be effectively utilized, and the reclamation of the landfill leachate is facilitated.
At present, the research of treating the landfill leachate by combining a forward osmosis microbial fuel cell and a membrane distillation process is not available.
Disclosure of Invention
The invention aims to solve the technical problem of providing a forward osmosis microbial fuel cell combined wastewater treatment system and a forward osmosis microbial fuel cell combined wastewater treatment method, wherein a forward osmosis microbial fuel cell and a membrane distillation process are combined for use, landfill leachate is used as an anode solution, a sodium chloride solution is used as a cathode solution, the degradation of pollutants is achieved, biomass energy is generated, the treatment effect of the landfill leachate is improved, the recycling of drawn solution is improved, and the problem that the process cannot stably run for a long time due to the fact that the drawn solution is diluted is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a just permeate microbial fuel cell combination processing effluent water system, including just permeating microbial fuel cell, membrane distillation plant and reflux unit, wherein just permeating microbial fuel cell includes anolyte side and catholyte side, anolyte side is the anode chamber, catholyte side includes cathode chamber, catholyte reserve tank and first peristaltic pump, the input in cathode chamber passes through catholyte input pipeline and is connected with first peristaltic pump, catholyte reserve tank in proper order, the output in cathode chamber passes through catholyte output pipeline and is connected with catholyte reserve tank, and the electrode of anode chamber and cathode chamber is fixed with titanium silk, external resistance is connected, forms the return circuit, and anode chamber and cathode chamber separate through the just permeable membrane, the just permeable membrane adopts cellulose triacetate just permeable membrane anode chamber, active layer orientation, parallelly connected blue electricity test system on the resistance, the blue test system is connected with the PC end; the membrane distillation device comprises a hot side, a cold side, a second peristaltic pump, a first gear pump, a constant-temperature water bath kettle and a membrane distillation assembly, the second gear pump, the membrane distillation assembly, a first high-precision low-temperature constant-temperature tank and a condenser pipe are arranged on the hot side, the hot side is sequentially connected with the second peristaltic pump and a catholyte storage tank through a hot side input pipeline, the hot side is arranged in the constant-temperature water bath kettle, the hot side is connected with the membrane distillation assembly through the first gear pump, the membrane distillation assembly is connected with the cold side through the second gear pump, the cold side is connected with the condenser pipe, the condenser pipe is connected with the first high-precision low-temperature constant-temperature tank, an electronic balance is arranged at the bottom of the cold side, the reflux device comprises the hot side, a third gear pump, a first high-precision low-temperature constant-temperature tank, the condenser pipe and a catholyte storage tank, the hot side is connected with the, The catholyte storage tank is connected, and the condenser pipe is connected with first high accuracy cryostat.
The further technical scheme of the invention is that the effective volumes of the anode chamber and the cathode chamber are 125mL, the anode chamber and the cathode chamber are separated by a forward osmosis membrane, and the middle part of the anode chamber and the cathode chamber is fixed by a special iron clamp.
The invention has the further technical scheme that the electrode materials of the anode chamber and the cathode chamber adopt carbon felts, and the projection area is 8cm2(1cm×8cm)。
According to a further technical scheme, the anolyte in the anode chamber is landfill leachate, and the catholyte in the cathode chamber is concentrated sodium chloride solution.
According to a still further technical scheme, the forward osmosis membrane is a cellulose triacetate forward osmosis membrane, the membrane distillation component is made of high-temperature-resistant materials, and a membrane distillation membrane in the membrane distillation component is a hydrophobic microfiltration membrane.
In a still further aspect of the present invention, the forward osmosis membrane has a diameter of 0.35m and an effective working area of 9.616 × 10-4m2。
According to a further technical scheme, the external resistor is 200 omega.
The treatment method of the forward osmosis microbial fuel cell combined wastewater treatment system comprises the following steps:
(a) the garbage leachate is placed in an anode chamber of a forward osmosis microbial fuel cell, the garbage leachate is degraded and generates electric energy through microorganisms and electrogenesis microorganisms in an anode, and meanwhile, water in the anolyte permeates through the forward osmosis membrane to reach a cathode chamber under the driving of osmotic pressure;
(b) the catholyte processed in the step (a) enters the hot side of membrane distillation through a first peristaltic pump, and the hot side is placed in a constant-temperature water bath (10);
(c) the hot side of the membrane distillation of step (b) enters a membrane distillation assembly through a first gear pump;
(d) the cold side is connected with the condenser pipe, hot side liquid and cold side liquid enter from the lower part of the membrane distillation assembly in a cross flow mode and return from the upper part of the membrane distillation assembly, and the change of mass in the cold side is calculated by adopting an electronic balance.
(e) And (d) cooling the liquid at the hot side of the membrane distillation by a condenser pipe, and returning the liquid to the catholyte storage tank through a third gear pump.
According to a further technical scheme, in the step (a), the carbon felt in the cathode chamber of the forward osmosis microbial fuel cell is burned at 600 ℃, and the anode chamber and the cathode chamber are connected by a titanium wire and externally connected with a 200 omega resistor to form a circuit.
According to a further technical scheme of the present invention, in the step (a), a cathode chamber of the forward osmosis microbial fuel cell is externally connected with a 1L catholyte storage tank, and is circularly operated by using a first peristaltic pump, wherein the flow rate is 60ml/min, so as to maintain the dissolved oxygen concentration of the cathode.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the landfill leachate treatment method of the invention is that leachate with low osmotic pressure is used as raw material liquid, sodium chloride solution with high osmotic pressure is used as drawing liquid, and the osmotic pressure difference between the sodium chloride solution and the leachate is used as driving force to make water spontaneously permeate from one side of an anode liquid through a selective permeable membrane to reach the cathode liquid-side so as to realize the interception of pollutants with low energy consumption; microbial degradation is carried out on part of pollutants in the landfill leachate in the anode chamber, and electric energy is generated at the same time; the combined process of OsMFC-MD (forward osmosis microbial fuel cell and membrane distillation process) improves the removal efficiency of pollutants, solves the problem that the process cannot stably run for a long time due to dilution of the drawn liquid, has the advantages of good effluent quality, no need of external pressure, electric energy generation and the like, and can directly and effectively treat the landfill leachate.
Drawings
FIG. 1 is a process flow diagram of the present invention for treating landfill leachate by using a forward osmosis microbial fuel cell and membrane distillation technology.
FIG. 2 shows power density curves and polarization curves for OsMFCs.
Fig. 3 is the water flux of membrane distillation.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
As shown in figure 1, a positive osmosis microbial fuel cell combined wastewater treatment system comprises a positive osmosis microbial fuel cell, a membrane distillation device and a reflux device, wherein the positive osmosis microbial fuel cell comprises an anolyte side and a catholyte side, the anolyte side is an anode chamber 1, the catholyte side comprises a cathode chamber 2, a catholyte storage tank 7 and a first peristaltic pump 6, the input end of the cathode chamber 2 is sequentially connected with the first peristaltic pump 6 and the catholyte storage tank 7 through a catholyte input pipeline, the output end of the cathode chamber 2 is connected with the catholyte storage tank 7 through a catholyte output pipeline, electrodes of the anode chamber 1 and the cathode chamber 2 are fixed by titanium wires, are connected with an external resistor 4 to form a loop, the anode chamber 1 is separated from the cathode chamber 2 through a positive osmosis membrane 3, and the positive osmosis membrane 3 adopts a cellulose triacetate positive osmosis membrane, The active layer faces the anode chamber 1, a blue light test system 5 is connected in parallel to the external resistor 4, and the blue light test system 5 is connected with a PC end 21; the membrane distillation device comprises a hot side 14, a cold side 12, a second peristaltic pump 8, a first gear pump 15, a constant temperature water bath 10, a membrane distillation assembly 16, a second gear pump 13, the membrane distillation assembly 16, a first high-precision low-temperature constant temperature tank 20 and a first condenser pipe 18, wherein the hot side 14 is sequentially connected with the second peristaltic pump 8 and the catholyte storage tank 7 through a hot side input pipeline, the hot side 14 is arranged in the constant temperature water bath 10, the hot side 14 is connected with the membrane distillation assembly 16 through the first gear pump 15, the membrane distillation assembly 16 is connected with the cold side 12 through the second gear pump 13, the cold side 12 is connected with the first condenser pipe 18, the first condenser pipe 18 is connected with the first high-precision low-temperature constant temperature tank 20, an electronic balance 11 is arranged at the bottom of the cold side 12, the reflux device comprises the hot side 14, a third gear pump 19, the first high-precision low-temperature constant temperature tank 20, a second condenser pipe 17 and the catholyte storage tank 7, the hot side 14 is connected with a second condenser pipe 17, the second condenser pipe 17 is sequentially connected with a third gear pump 19 and a catholyte storage tank 7 through the condenser pipe, and the second condenser pipe 17 is connected with a first high-precision low-temperature constant-temperature tank 20.
The effective volume of anode chamber 1 and cathode chamber 2 is 125mL, and is separated by forward osmosis membrane 3 between anode chamber 1 and the cathode chamber 2, the centre is fixed with special iron clamp, the electrode material of anode chamber 1 and cathode chamber 2 adopts carbon felt, projection area is 8cm2(1cm × 8cm), saidThe anolyte in the anode chamber 1 is landfill leachate, and the catholyte in the cathode chamber 2 is concentrated sodium chloride solution.
The forward osmosis membrane 3 is a cellulose triacetate forward osmosis membrane, the material of the membrane distillation component 16 is a high temperature resistant material, the membrane distillation membrane in the membrane distillation component 16 is a hydrophobic microfiltration membrane, the diameter of the forward osmosis membrane 3 is 0.35m, and the effective working area is 9.616 × 10-4m2。
The external resistor 4 is 200 Ω.
In the embodiment, the effective volumes of a cathode chamber 2 and an anode chamber 1 in the forward osmosis microbial fuel cell are both 125mL, the two chambers are separated by a forward osmosis membrane 3 (the diameter is 0.35m, the effective working area is 9.616 × 10-4m2), the middle of the two chambers is fixed by a special iron clamp, the cathode and the anode of the forward osmosis microbial fuel cell are made of carbon felt, the projected area is 8cm2(1cm × 8cm), wherein in order to further improve the electricity generation performance of the microbial fuel cell, the cathode carbon felt is subjected to 600 ℃ burning treatment, the two electrodes are connected by a titanium wire, an external resistor (R is 200 omega) forms a circuit, the cathode is externally connected with a 1L catholyte storage tank 7, the first peristaltic pump 6 is used for circulating operation, and the flow rate is 60mL/min, so as to maintain the dissolved oxygen concentration of the cathode.
A forward osmosis microbial fuel cell combined wastewater treatment system treatment method comprises the following steps:
1. the garbage percolate is placed in an anode chamber 1 of a forward osmosis microbial fuel cell, the garbage percolate is degraded and generates electric energy through microorganisms and electrogenesis microorganisms in an anode, meanwhile, water in the anolyte permeates through the forward osmosis membrane to enter a cathode chamber 2 under the driving of osmotic pressure,
2. the catholyte processed in the step 2 enters a hot side 14 of the membrane distillation through a first peristaltic pump 6, and the hot side 14 is placed in a constant-temperature water bath 10;
3. the hot side 14 of the membrane distillation of step 3 enters the membrane distillation assembly through a first gear pump 15;
4. the cold side 12 is connected with a first condenser pipe 18, hot side liquid and cold side liquid enter from the lower part of the membrane distillation assembly 16 in a cross flow mode and return from the upper part of the membrane distillation assembly, and the change of the mass in the cold side is calculated by using an electronic balance 11.
5. The liquid at the hot side 14 of the membrane distillation in the step 4 is cooled by a first condenser 18 and then returned to the catholyte storage tank 7 through a third gear pump 19.
In the step 1, the carbon felt in the cathode chamber 2 of the forward osmosis microbial fuel cell is burned at 600 ℃, electrodes of the anode chamber 1 and the cathode chamber 2 are connected by a titanium wire and externally connected with a 200 ohm resistor to form a circuit, the cathode chamber 2 of the forward osmosis microbial fuel cell is externally connected with a 1L catholyte storage tank 7 and circularly operated by a first peristaltic pump 6, and the flow rate is 60ml/min to keep the dissolved oxygen concentration of the cathode.
Example 2
As shown in fig. 1, in this example, leachate from a landfill of Shanghai city is used as anolyte, the volume is 0.25L, the draw solution is 1mol/L sodium chloride solution, the volume of the catholyte storage tank is 1L, a forward osmosis membrane is used for separation between the anode chamber and the cathode chamber, the forward osmosis membrane is a commercial CTA-ES membrane of HTI corporation, USA, the effective membrane area is 9.616 × 10-4m2, and the active layer faces the anode chamber.
The membrane distillation component is a flat membrane component, an acrylic shell, the effective membrane area is 21cm2, the water flow channel length is 70mm, the width is 30mm, the depth of a groove corresponding to the membrane is 3mm, and the hydrophobic micro-filtration membrane is a PTFE-PVDF hydrophobic membrane with the aperture of 0.45 mu m of a certain chemical engineering science and technology company Limited in Shanghai. The gear pump is adopted to transmit the water solution, the constant temperature water bath is used for heating the catholyte, and the high-precision low-temperature thermostatic bath is used for cooling the penetrating fluid on the water producing side of the membrane distillation and the catholyte which flows back to the catholyte storage tank.
The cold side was placed on an electronic balance and balance data were recorded by a computer and saved for calculation of membrane distilled water flux. The salt rejection was calculated by measuring the conductivity change in the cold side liquid.
Under the operation condition of the present embodiment, the main components of the landfill leachate are shown in table 1. After being treated by the forward osmosis microbial fuel cell, the effluent quality is shown in the table 2; as shown in FIG. 2, the open circuit voltage of OsMFC was 0.615V, the apparent internal resistance of OsMFC was 236.750 Ω according to the slope of the polarization curve, the maximum area power density of OsMFC was 0.442 W.m-2, and the corresponding current density was 1.663 A.m-2. The OsMFC catholyte is subjected to membrane distillation, the temperature of a cold side is controlled, the temperature of a hot side is continuously increased, the fluid temperature difference between the two sides of the membrane is increased, the membrane flux is increased along with the increase of the temperature and rises in an approximately exponential law, and the trend graph of the membrane flux along with the temperature change is shown in figure 3. When the temperature of the cold side is not changed, the temperature of the hot side is increased, the saturated vapor pressure of the hot side is increased, and the temperature of the membrane surface and the temperature of the membrane are also increased, so that the permeability coefficient and the mass transfer driving force are increased, and the membrane flux is greatly increased. But the hot side temperature cannot be increased indefinitely due to limitations of the membrane material and the increased energy consumption due to excessive temperatures. As the catholyte adopts sodium chloride, the membrane distilled water contains a small amount of chloride ions. As the temperature rises, the concentration of chloride ions in the membrane distilled water becomes smaller and smaller, and the removal effect becomes better and better, as shown in Table 3. As the temperature of the hot side rises, the higher the equilibrium vapor pressure of the chloride ions and water in the catholyte is, the mass transfer driving force is increased, so that more chloride ions come to the cold side, but the increase amplitude of the chloride ion flux is smaller than that of the water flux due to concentration polarization, so that the chloride ion concentration in the cold side distillate is reduced along with the rise of the temperature of the hot side. With the temperature rise, the total phosphorus concentration in the membrane distilled water firstly rises and then falls with the temperature rise. The increase amplitude of the total phosphorus flux is larger than that of the water flux in a certain temperature range, and the increase amplitude of the total phosphorus flux is smaller than that of the water flux along with the increase of the temperature, so that the total phosphorus concentration in the cold-side distillate is increased and then reduced along with the increase of the temperature of the hot side. As the temperature increases, the concentration of ammonium ions in the membrane distilled water increases with increasing temperature. With the temperature of the hot side rising, the vapor partial pressure of the volatile ammonia in the catholyte increases, increasing the mass transfer driving force, thereby allowing more volatile ammonia to come to the cold side. Along with the rise of the temperature, the COD and the TOC concentration in the membrane distilled water firstly rise and then fall along with the rise of the temperature, the increase amplitude of the COD and the TOC flux is larger than the increase amplitude of the water flux in a certain temperature range, and along with the rise of the temperature, the increase amplitude of the COD and the TOC flux is smaller than the increase amplitude of the water flux, so that the COD and the TOC concentration in the cold-side distillate firstly rise and then fall along with the rise of the temperature of a hot side. Finally, the effluent reaches the secondary standard in Integrated wastewater discharge Standard (GB 8978-1996).
TABLE 1 major composition of landfill leachate
Figure GDA0002465662640000061
TABLE 2 removal rate after OsMFC treatment
Figure GDA0002465662640000071
TABLE 3 quality of the membrane distilled effluent
Figure GDA0002465662640000072

Claims (10)

1. The utility model provides a positive infiltration microbial fuel cell combination processing effluent system, includes positive infiltration microbial fuel cell, membrane distillation plant and reflux unit, its characterized in that: just permeate microbial fuel cell includes that the anolyte inclines and the catholyte inclines, the anolyte inclines to anode chamber (1), the catholyte inclines includes cathode chamber (2), catholyte reserve tank (7) and first peristaltic pump (6), the input of cathode chamber (2) passes through catholyte input pipeline and is connected with first peristaltic pump (6), catholyte reserve tank (7) in proper order, the output of cathode chamber (2) passes through catholyte output pipeline and is connected with catholyte reserve tank (7), and the electrode of anode chamber (1) and cathode chamber (2) is fixed with titanium silk, external resistance (4) are connected, form the return circuit, anode chamber (1) and cathode chamber (2) are through positive osmotic membrane (3) separation, positive osmotic membrane (3) adopt triacetylcellulose positive osmotic membrane, active layer orientation anode chamber (1), parallelly connected blue electricity test system (5) on external resistance (4), the blue light test system (5) is connected with a PC (personal computer) end (21); the membrane distillation device comprises a hot side (14), a cold side (12), a second peristaltic pump (8), a first gear pump (15), a constant-temperature water bath (10), a membrane distillation assembly (16), a second gear pump (13), a membrane distillation assembly (16), a first high-precision low-temperature constant-temperature tank (20) and a first condensation pipe (18), wherein the hot side (14) is sequentially connected with the second peristaltic pump (8) and a catholyte storage tank (7) through a hot side input pipeline, the hot side (14) is arranged in the constant-temperature water bath (10), the hot side (14) is connected with the membrane distillation assembly (16) through the first gear pump (15), the membrane distillation assembly (16) is connected with the cold side (12) through the second gear pump (13), the cold side (12) is connected with the first condensation pipe (18), and the first condensation pipe (18) is connected with the first high-precision low-temperature constant-temperature tank (20), cold side (12) bottom is equipped with electronic balance (11), reflux unit includes hot side (14), third gear pump (19), first high accuracy cryostat tank (20), second condenser pipe (17) and catholyte reserve tank (7), hot side (14) are connected with second condenser pipe (17), second condenser pipe (17) are connected with third gear pump (19), catholyte reserve tank (7) in proper order through the condenser pipe, second condenser pipe (17) are connected with first high accuracy cryostat tank (20).
2. The forward osmosis microbial fuel cell combination wastewater treatment system of claim 1, wherein: the effective volumes of the anode chamber (1) and the cathode chamber (2) are 125mL, the anode chamber (1) and the cathode chamber (2) are separated by a forward osmosis membrane (3), and the middle of the anode chamber and the cathode chamber are fixed by a special iron clamp.
3. The forward osmosis microbial fuel cell combination wastewater treatment system of claim 1, wherein: the anode chamber (1) and the cathode chamber (2) are made of carbon felts, and the projection area is 8cm2。
4. The forward osmosis microbial fuel cell combination wastewater treatment system of claim 1, wherein: the anolyte in the anode chamber (1) is landfill leachate, and the catholyte in the cathode chamber (2) is concentrated sodium chloride solution.
5. The forward osmosis microbial fuel cell combination wastewater treatment system of claim 1, wherein: the forward osmosis membrane (3) is a cellulose triacetate forward osmosis membrane, the material of the membrane distillation component (16) is a high-temperature-resistant material, and the membrane distillation membrane in the membrane distillation component (16) is a hydrophobic microfiltration membrane.
6. The forward osmosis microbial fuel cell combined wastewater treatment system as claimed in claim 1, wherein the forward osmosis membrane (3) has a diameter of 0.35m and an effective working area of 9.616 × 10-4m2。
7. The forward osmosis microbial fuel cell combination wastewater treatment system of claim 1, wherein: the external resistor (4) is 200 omega.
8. A forward osmosis microbial fuel cell combination wastewater treatment system treatment method as claimed in claim 1, wherein: the method comprises the following steps:
(a) the method comprises the following steps of placing landfill leachate in an anode chamber (1) of a forward osmosis microbial fuel cell, degrading the landfill leachate by microorganisms and electrogenesis microorganisms in an anode to generate electric energy, and simultaneously driving water in the anolyte to penetrate through the forward osmosis membrane to enter a cathode chamber (2) due to osmotic pressure;
(b) the catholyte processed in the step (a) enters a hot side (14) of membrane distillation through a first peristaltic pump (6), and the hot side (14) is placed in a constant-temperature water bath (10);
(c) the hot side (14) of the membrane distillation of step (b) enters the membrane distillation assembly through a first gear pump (15);
(d) the cold side (12) is connected with a first condenser pipe (18), hot side liquid and cold side liquid enter from the lower part of the membrane distillation assembly (16) in a cross flow mode and return from the upper part of the membrane distillation assembly, and the change of mass in the cold side is calculated by an electronic balance (11);
(e) and (d) cooling the liquid at the hot side (14) of the membrane distillation by a condenser pipe (18), and returning the liquid to the catholyte storage tank (7) through a third gear pump (19).
9. The forward osmosis microbial fuel cell combined wastewater treatment system treatment method of claim 8, wherein: in the step (a), the carbon felt in the cathode chamber (2) of the forward osmosis microbial fuel cell is burned at 600 ℃, and electrodes of the anode chamber (1) and the cathode chamber (2) are connected by a titanium wire and externally connected with a 200 omega resistor to form a circuit.
10. The forward osmosis microbial fuel cell combined wastewater treatment system treatment method of claim 8, wherein: in the step (a), the cathode chamber (2) of the forward osmosis microbial fuel cell is externally connected with a 1L catholyte storage tank (7) and circularly operated by a first peristaltic pump (6) at the flow rate of 60ml/min so as to maintain the dissolved oxygen concentration of the cathode.
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