CN110316913B - Combined desalination wastewater treatment system for synchronously recovering salt difference energy and chemical energy in sewage - Google Patents
Combined desalination wastewater treatment system for synchronously recovering salt difference energy and chemical energy in sewage Download PDFInfo
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Abstract
The invention discloses a combined desalination wastewater treatment system for synchronously recovering salt difference energy and chemical energy in sewage, which consists of a microorganism reverse electrodialysis cell and an electrodialysis cell, and is characterized in that: the microorganism reverse electrodialysis cell is used for recovering the salt difference energy between the high-concentration salt wastewater and the low-concentration salt fresh water and the chemical energy of organic matters in the high-concentration salt wastewater and generating electric energy; the electrodialysis cell is used for desalting the high-salinity wastewater by using the electric energy generated by the microorganism reverse electrodialysis cell; the microbial reverse electrodialysis cell comprises an anode chamber and a cathode chamber, wherein the anode chamber and the cathode chamber are separated by a membrane group; an anode carbon brush is arranged in the anode cavity, and electrogenesis microorganisms are attached to the surface of the anode carbon brush; an air cathode is arranged in the cathode chamber; the membrane group comprises an anion exchange membrane, a cation exchange membrane, a high-concentration salt wastewater runner and a low-concentration salt fresh water runner; the invention can also be widely applied to the fields of energy, chemical industry, environmental protection and the like.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a combined desalination wastewater treatment system for synchronously recovering salt difference energy and sewage chemical energy.
Background
In recent years, the tuber mustard industry has been rapidly developed and sold in a large quantity. But it discharges a large amount of wastewater having high salt and high concentration of organic matter during the production process. Statistically, about 500 ten thousand tons of waste water of hot pickled mustard tuber are generated in the three gorges reservoir area each year, and the discharge amount thereof shows a tendency to increase year by year. If the waste water flows into the three gorges reservoir area without being treated, the ecological environment of the reservoir area is easily seriously influenced by the excessively high salinity and organic matter content (chemical oxygen demand, COD value of 3000-20000 mg/L).
At present, most tuber mustard production plants directly utilize fresh water to dilute waste water from the perspective of saving cost, and then adopt an anaerobic fermentation method to treat organic matters in the waste water. According to the field research, the salt concentration in the preserved szechuan pickle waste water is as high as 200g/L, so that the anaerobic fermentation microorganisms are prevented from being dehydrated and dead in a high-salt environment, and the waste water can reach the national discharge standard that the salinity is less than 20 g/L. And products after anaerobic fermentation are difficult to collect, so that a large amount of chemical energy contained in organic matters in the wastewater is wasted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a combined desalination wastewater treatment system for synchronously recovering salt difference energy and sewage chemical energy.
The technical scheme of the invention is as follows: the utility model provides a joint desalination effluent disposal system of synchronous recovery salt difference ability and chemical energy in sewage, comprises microorganism reverse electrodialysis pond and electrodialysis cell, its characterized in that:
the microorganism reverse electrodialysis cell is used for recovering the salt difference energy between the high-concentration salt wastewater and the low-concentration salt fresh water and the chemical energy of organic matters in the high-concentration salt wastewater and generating electric energy.
The electrodialysis cell is used for desalting the high-salinity wastewater by using the electric energy generated by the microorganism reverse electrodialysis cell.
The microbial reverse electrodialysis cell comprises an anode chamber and a cathode chamber, wherein the anode chamber and the cathode chamber are separated by a membrane group; an anode carbon brush is arranged in the anode cavity, and electrogenesis microorganisms are attached to the surface of the anode carbon brush; an air cathode is arranged in the cathode chamber; the membrane group comprises an anion exchange membrane, a cation exchange membrane, a high-concentration salt wastewater runner and a low-concentration salt fresh water runner.
The electrodialysis pool is internally provided with a second cation exchange membrane and a second anion exchange membrane, and the second anion exchange membrane and the second cation exchange membrane divide the electrodialysis pool into an anode chamber, a desalting chamber and a cathode chamber; the cathode chamber and the anode chamber are respectively provided with a cathode electrode and an anode electrode; the cathode electrode and the anode electrode are respectively connected with an anode carbon brush and an air cathode of the microbial reverse electrodialysis cell 1 so as to receive electric energy generated by the microbial reverse electrodialysis cell.
High-concentration salt wastewater and low-concentration salt fresh water are pumped into the membrane group and flow along the high-concentration salt wastewater runner and the low-concentration salt fresh water runner respectively, and due to different salt concentrations in the high-concentration salt wastewater and the low-concentration salt fresh water, the generated salt difference enables cations in the high-concentration salt wastewater and the low-concentration salt fresh water to enter the cathode chamber through the cation exchange membrane, anions enter the anode chamber through the anion exchange membrane, and the directional movement of the cations and the anions generates electric energy; and after the salt difference energy is recovered by the module, the discharged high-concentration salt wastewater enters the desalting chamber of the electrodialysis cell, and Na + and Cl-in the high-concentration salt wastewater in the desalting chamber respectively migrate to the cathode chamber and the anode chamber through a second cation exchange membrane and a second anion exchange membrane respectively, so that the desalting treatment is realized.
Desalting the high-concentration salt wastewater to obtain low-salt wastewater, pumping the low-salt wastewater into an anode chamber of a microorganism reverse electrodialysis cell to provide organic matters for the electricity-generating microorganisms attached to an anode carbon brush and simultaneously perform degradation treatment, and discharging the obtained low-salt low-organic matter wastewater; and the directional movement of the cations and the anions in the module, the potential difference generated at the two ends of the module enhances the transmission of the ions and the movement of electrons in an external circuit, and plays a role of an internal power supply so as to improve the rate of degrading organic matters and the electricity generation performance of the anode carbon brush.
The invention utilizes the characteristic of high salt and high organic matter COD of the preserved szechuan pickle waste water, if the reverse electrodialysis principle is adopted, the salt difference energy can be captured in the form of electric energy from the salinity difference gradient between the high salinity waste water and the fresh water, and the microbial energy conversion technology can be utilized to obtain the electric energy while degrading the COD in the waste water, namely, the chemical energy in the organic matter is recovered by the electric energy. The recovered electric energy can supply power to the electrodialysis cell to realize the desalination of the preserved szechuan pickle production wastewater. Therefore, the invention firstly provides the MRC-ED system for treating the waste water of the preserved szechuan pickle production and recovering the salt by utilizing the combination of the microbial reverse osmosis cell and the electrodialysis cell system. On one hand, the system captures salt difference energy by utilizing the concentration gradient between high salt water and fresh water, simultaneously recovers electric energy in organic matters by utilizing the microbial electrochemical principle, and uses the recovered electric energy for electrodialysis, thereby achieving the purposes of reducing the treatment cost of tuber mustard wastewater, recovering the salt in the tuber mustard wastewater, reducing the use of a large amount of fresh water resources and realizing the purposes of energy conservation and emission reduction.
The invention firstly provides a method for treating waste water generated in the production process of preserved szechuan pickle by utilizing a microorganism reverse electrodialysis cell, and simultaneously recovering salt difference energy and chemical energy in organic waste water, thereby realizing the synchronous recovery of the chemical energy and the salt difference energy in the preserved szechuan pickle waste water; and the electric energy of the microorganism reverse electrodialysis cell is applied to the electrodialysis cell, so that the in-situ utilization of the electric energy is realized, the system cost is reduced, and the practical application is facilitated.
According to the preferable scheme of the combined desalination wastewater treatment system for synchronously recovering the salt difference energy and the chemical energy in the sewage, the desalination chamber is provided with a wastewater electrodialysis inlet and a wastewater electrodialysis outlet.
The membrane group is provided with a high-concentration salt wastewater outlet, a low-concentration salt fresh water inlet, a high-concentration salt wastewater inlet and a low-concentration salt fresh water outlet; the high concentration salt waste water export is linked together through the high concentration salt waste water runner that sets up in the module with the useless import of high concentration salt, and low concentration salt fresh water import is linked together through the low concentration salt fresh water runner that sets up in the module with the low concentration salt fresh water export.
According to the preferable scheme of the combined desalination wastewater treatment system for synchronously recovering the salt difference energy and the chemical energy in the sewage, the membrane group comprises a plurality of membrane group units; anion exchange membranes, first silica gel sheets, cation exchange membranes and second silica gel sheets are alternately arranged in each membrane group unit.
The first silica gel sheet is provided with a high-concentration salt wastewater runner and two low-concentration salt fresh water through holes; the second silica gel sheet is provided with a low-concentration salt fresh water runner and two high-concentration salt waste water through holes; the two low-concentration salt fresh water through holes respectively correspond to the outflow end and the inflow end of a low-concentration salt fresh water flow channel arranged on the second silica gel sheet; the two high-concentration salt wastewater through holes respectively correspond to the outflow end and the inflow end of a high-concentration salt wastewater runner arranged on the first silica gel sheet.
The anion exchange membrane is provided with a first through hole and a second through hole, and the first through hole corresponds to the outflow end of the high-concentration salt wastewater runner arranged on the first silica gel sheet; the inlet end of a low-concentration salt fresh water flow channel arranged on the second silica gel sheet corresponds to the inlet end of the low-concentration salt fresh water flow channel through a hole II; and a third through hole and a fourth through hole are formed in the cation exchange membrane, the third through hole corresponds to the inflow end of the high-concentration salt wastewater runner arranged on the first silica gel sheet, and the fourth through hole corresponds to the outflow end of the low-concentration salt fresh water runner arranged on the second silica gel sheet.
According to the preferable scheme of the combined desalination wastewater treatment system for synchronously recovering the salt difference energy and the chemical energy in the sewage, 2 or more than 2 microbial reverse electrodialysis cells are provided; the electrodes of all the microorganism reverse electrodialysis cells are connected in series.
The combined desalination wastewater treatment system for synchronously recovering the salt difference energy and the chemical energy in the sewage has the beneficial effects that:
the combined desalination wastewater treatment system is adopted to capture salt difference energy by utilizing the concentration gradient between high-salt water and fresh water according to the reverse electrodialysis principle, simultaneously recover electric energy in organic matters according to the microbial electrochemical principle, and use the recovered electric energy for electrodialysis, so that the aims of reducing the treatment cost of wastewater generated by tuber mustard production, recovering the salt in the wastewater generated by tuber mustard production and reducing the use of a large amount of fresh water resources, saving energy and reducing emission are fulfilled, the defect that the traditional tuber mustard wastewater is directly diluted by tap water is overcome, and the combined desalination wastewater treatment system has high economic and social benefits. The invention can also be widely applied to the fields of energy, chemical industry, environmental protection and the like.
Drawings
FIG. 1 is a schematic structural diagram of a combined desalination wastewater treatment system for synchronously recovering salt difference energy and chemical energy in sewage.
Fig. 2 is a schematic structural diagram of the film assembly 14.
Fig. 3 is a schematic structural view of the first silicone sheet 26.
Fig. 4 is a schematic structural view of the second silicone sheet 27.
Fig. 5 is a graph comparing the electricity generation performance of the microbial reverse electrodialysis cell 1 with that of MFC without a module.
FIG. 6 is a diagram illustrating the desalination effect of the desalination wastewater treatment system for simultaneous recovery of salt difference energy and chemical energy in wastewater according to the present invention.
Detailed Description
Referring to fig. 1 to 4, a combined desalination wastewater treatment system for synchronously recovering salt difference energy and chemical energy in sewage comprises a microbial reverse electrodialysis cell 1 and an electrodialysis cell 2.
The microbial reverse electrodialysis cell 1 is used for recovering salt difference energy between the high-concentration salt wastewater HC and the low-concentration salt fresh water LC and chemical energy of organic matters in the high-concentration salt wastewater and generating electric energy.
The electrodialysis cell 2 is used for desalting the high-salinity wastewater by using the electric energy generated by the microorganism reverse electrodialysis cell 1.
The microbial reverse electrodialysis cell comprises an anode chamber 3 and a cathode chamber 13, wherein the anode chamber 3 and the cathode chamber 13 are separated by a membrane group 14; an anode carbon brush 15 is arranged in the anode chamber 3, and electrogenic microorganisms are attached to the surface of the anode carbon brush 15; an air cathode 12 is provided in the cathode chamber 13; the membrane group 14 comprises an anion exchange membrane 8, a cation exchange membrane 9, a high-concentration salt wastewater flow passage and a low-concentration salt fresh water flow passage.
A second cation exchange membrane 21 and a second anion exchange membrane 22 are arranged in the electrodialysis cell 2, and the electrodialysis cell 2 is divided into an anode chamber 6, a desalination chamber 7 and a cathode chamber 16 by the second anion exchange membrane 22 and the second cation exchange membrane 21; a cathode electrode 20 and an anode electrode 17 are respectively arranged in the cathode chamber and the anode chamber; the cathode electrode 20 and the anode electrode 17 are respectively connected with the anode carbon brush 15 and the air cathode 12 of the microbial reverse electrodialysis cell 1 to receive the electric energy generated by the microbial reverse electrodialysis cell 1.
Pumping the high-concentration salt wastewater and the low-concentration salt fresh water into the membrane group 14, and respectively flowing along the high-concentration salt wastewater flow passage and the low-concentration salt fresh water flow passage, wherein the salinity difference between the high-concentration salt wastewater and the low-concentration salt fresh water causes cations in the high-concentration salt wastewater and the low-concentration salt fresh water to enter the cathode chamber 13 through the cation exchange membrane due to the different salt concentrations of the high-concentration salt wastewater and the low-concentration salt fresh water, the anions enter the anode chamber 3 through the anion exchange membrane, and the directional movement of the cations and the anions generates a potential difference, so that the salt difference energy is recovered; high-concentration salt wastewater discharged after the salt difference energy is recovered by the module 14 enters the desalting chamber 7 of the electrodialysis cell 2, and Na + and Cl-in the high-concentration salt wastewater respectively migrate to the cathode chamber 16 and the anode chamber 6 through the cation exchange membrane 21 and the anion exchange membrane 22, so that desalting treatment is realized.
Desalting the high-concentration salt wastewater to obtain low-salt wastewater, pumping the low-salt wastewater into an anode chamber 3 of the microbial reverse electrodialysis cell 1 to provide organic matters for the electrogenic microbes attached to the anode carbon brush 15 and simultaneously perform degradation treatment, and discharging the obtained low-salt low-organic matter wastewater; and the directional movement of the cations and the anions in the module 14 generates a potential difference, so that the transmission of ions in the solution and the movement of electrons in an external circuit are enhanced, and the anode carbon brush 15 plays a role of an internal power supply so as to improve the rate of degrading organic matters and the electricity generation performance.
The desalting chamber 7 of the electrodialysis cell 2 is provided with a wastewater electrodialysis liquid inlet and outlet 19. The anode chamber 3 of the microorganism reverse electrodialysis cell 1 is provided with a liquid inlet and a liquid outlet 18.
The membrane group 14 is provided with a high-concentration salt wastewater outlet 4, a low-concentration salt fresh water inlet 5, a high-concentration salt wastewater inlet 10 and a low-concentration salt fresh water outlet 11; high concentration salt waste water outlet 4 is linked together through the high concentration salt waste water runner that sets up with the useless import 10 of high concentration salt in the module, and low concentration salt fresh water import 5 is linked together through the low concentration salt fresh water runner that sets up in the module with low concentration salt fresh water outlet 11.
High-concentration salt wastewater is pumped into the microbial reverse electrodialysis cell 1 from the high-concentration salt wastewater inlet 10, low-concentration salt fresh water is pumped into the microbial reverse electrodialysis cell 1 from the low-concentration salt fresh water inlet 5, after salt difference energy is recovered through the module 14, the high-concentration salt wastewater is discharged from the high-concentration salt wastewater outlet 4, and the low-concentration salt fresh water is discharged from the low-concentration salt fresh water outlet 11; the low-salt high-COD wastewater entering from the liquid inlet and outlet 18 provides organic matters for electrogenic microorganisms attached to the anode carbon brush 15, and the low-salt high-COD wastewater is degraded to obtain low-salt low-COD wastewater which is discharged from the liquid inlet and outlet 18.
The high-concentration salt wastewater discharged from the high-concentration salt wastewater outlet 10 enters the intermediate chamber through the wastewater electrodialysis inlet and outlet 19 for desalination treatment, and the wastewater with low salt and high COD obtained after treatment is pumped out from the wastewater electrodialysis inlet and outlet 19 and enters the anode chamber 3 through the inlet and outlet 18.
In a specific embodiment, the membrane module 14 includes a plurality of membrane module units, and an anion exchange membrane is further disposed on a cathode side of the nth membrane module unit. Anion exchange membranes 8, first silica gel sheets 26, cation exchange membranes 9 and second silica gel sheets 27 are alternately arranged in each membrane group unit.
For convenience of processing, the first silica gel sheet 26 is provided with a high-concentration salt wastewater runner 25 and two low-concentration salt fresh water through holes 24; the second silica gel sheet 27 is provided with a low-concentration salt fresh water runner 29 and two high-concentration salt waste water through holes 30; the two low-concentration salt fresh water through holes 24 respectively correspond to the outflow end and the inflow end of a low-concentration salt fresh water runner 29 arranged on the second silica gel sheet 27; the two high-concentration salt wastewater through holes 30 correspond to the outflow end and the inflow end of the high-concentration salt wastewater runner 25 arranged on the first silica gel sheet 26 respectively.
The anion exchange membrane 8 is provided with a first through hole 23a and a second through hole 23b, and the first through hole 23a corresponds to the outflow end of the high-concentration salt wastewater channel 25 arranged on the first silica gel sheet 26; the inlet end of the low-concentration salt fresh water flow channel 29 arranged on the second silica gel sheet 27 corresponds to the through hole two 23 b; the cation exchange membrane 9 is provided with a third through hole 23c and a fourth through hole 23d, the third through hole 23c corresponds to the inflow end of the high-concentration salt wastewater runner 25 arranged on the first silica gel sheet 26, and the fourth through hole 23d corresponds to the outflow end of the low-concentration salt fresh water runner 29 arranged on the second silica gel sheet 27.
And a first through hole and a second through hole which are arranged on an anion exchange membrane arranged on the cathode side of the nth membrane group unit are respectively connected with the high-concentration salt wastewater inlet 10 and the low-concentration salt fresh water outlet 11.
The method comprises the following steps: the high-concentration salt wastewater through hole of the first membrane module unit 141 corresponds to the outflow end of the high-concentration salt wastewater runner of the second module unit and corresponds to the inflow end of the high-concentration salt wastewater runner of the first module unit, and the outflow end of the high-concentration salt wastewater runner of the first module unit is communicated with the high-concentration salt wastewater outlet 4; the low-concentration salt and fresh water through hole of the first module unit 141 corresponds to the outflow end of the low-concentration salt and fresh water runner 29 and corresponds to the inflow end of the low-concentration salt and fresh water runner of the second module unit; the inflow end of the low-concentration salt fresh water flow passage 29 is communicated with the low-concentration salt fresh water inlet 5.
The high-concentration salt wastewater through hole of the second membrane module unit 142 corresponds to the outflow end of the high-concentration salt wastewater runner of the third module unit, and simultaneously corresponds to the inflow end of the high-concentration salt wastewater runner of the second module unit 142; the low concentration salt and fresh water passing hole of the second module unit 142 corresponds to the outflow end of the low concentration salt and fresh water flow passage 29, and corresponds to the inflow end of the low concentration salt and fresh water flow passage of the third module unit.
And so on.
The high-concentration salt wastewater through hole of the nth membrane module unit 14n corresponds to the outflow end of the high-concentration salt wastewater runner of the nth module unit and corresponds to the inflow end of the high-concentration salt wastewater runner of the (n-1) th module unit; the low-concentration salt and fresh water through hole of the nth module unit 14n corresponds to the outflow end of the low-concentration salt and fresh water runner of the (n-1) th module unit; and simultaneously corresponds to the inflow end of the low-concentration salt fresh water runner 29 of the nth module unit, and the outflow end of the low-concentration salt fresh water runner 29 of the nth module unit is communicated with the low-concentration salt fresh water outlet 11; the inflow end of the high-concentration salt wastewater channel of the nth module unit is communicated with a high-concentration salt wastewater inlet 10.
And mounting holes 28 are provided at four corners of the anion exchange membrane 8, the first silica gel sheet 26, the cation exchange membrane 9 and the second silica gel sheet 27.
According to the requirement of the electrodialysis cell 2 on electric energy, two or more than two microorganism reverse electrodialysis cells 2 can be arranged; the electrodes of all the microorganism reverse electrodialysis cells are connected in series.
The working principle of the system is as follows:
when the system works, the high-concentration salt wastewater HC and the low-concentration salt fresh water LC are pumped into a membrane group 14 of the microbial reverse electrodialysis cell MRC, the high-concentration salt wastewater HC and the low-concentration salt fresh water LC respectively flow along a high-concentration salt wastewater runner and a low-concentration salt fresh water runner, and due to the fact that the salt concentration in the high-concentration salt wastewater and the low-concentration salt fresh water is different, the generated salt difference enables cations in the high-concentration salt wastewater and the low-concentration salt fresh water to enter a cathode chamber through a cation exchange membrane, anions enter an anode chamber through an anion exchange membrane, the cations and the anions are driven to move directionally by the salinity difference, and the transmission of the ions and the movement of electrons in an external circuit are enhanced by the potential difference generated at the two ends of the high-concentration salt wastewater and the low-concentration salt fresh water LC, so that the high-concentration salt wastewater.
The degradation of organic matters in the high-concentration salt wastewater is mainly carried out on an anode carbon brush. Microorganisms having organic matter degradation ability are attached to the anode carbon brush. When degraded, the microbial electrochemical reaction takes place as shown in formula 1.1:
and (3) anode reaction:
(CH2O)n+nH2O-4ne-→nCO2+4nH+formula (1.1)
The organic matter is degraded to release electrons and H +, and the electrons are transferred to the cathode through an external circuit under the action of potential difference between the anode and the cathode and generate current; at the cathode, the oxygen in the air will accept the H + in the catholyte and combine with the electrons transferred from the external circuit to react on the electrode to produce water, as shown in formula 1.2.
And (3) cathode reaction:
nO2+4nH++4ne-→2nH2o type (1.2)
The whole reaction process is as formula 1.3, the material and charge balance of the system is maintained, the organic substrate of the waste water in the anode is gradually consumed along with the continuous reaction, and the battery also obtains continuous current and power output.
And (3) total reaction: (CH)2O)n+nO2→nH2O+nCO2Formula (1.3)
Under the action of a direct current electric field (working voltage is about 1.8V) provided by the microbial reverse electrodialysis cell, Na + and Cl-in the high-concentration salt wastewater HC are respectively and directionally migrated to a cathode electrode and an anode electrode in a desalting chamber by utilizing the selective permeability of an ion exchange membrane, so as to enter cathode chambers and anode chambers at two ends. The high-concentration salt wastewater is desalted and then becomes low-salt wastewater. Because the salinity of the wastewater is obviously reduced and reaches the level capable of carrying out biochemical treatment, the part of the wastewater with low salinity and high COD can be directly introduced into the anode chamber of the MRC for organic matter degradation.
After the high-concentration salt wastewater is subjected to desalination treatment by an electrodialysis cell and MRC degradation treatment by a microorganism reverse electrodialysis cell, the salinity and COD content in the wastewater can reach the discharge standard. The extremely high concentration salt solution enriched in the cathode chamber and the anode chamber of the electrodialysis cell can be recycled. Such as industrial salt made into snow-melting salt.
Referring to fig. 5, fig. 5 is a graph comparing the power generation performance of the microbial reverse electrodialysis cell 1 with that of MFC without a module.
The experimental conditions are as follows: 200g/L (HC) of high-concentration NaCl solution and 0.5g/L (LC) of low-concentration NaCl solution are prepared. And (3) introducing HC and LC into a high-concentration salt wastewater flow channel and a low-concentration salt fresh water flow channel of the MRC through a peristaltic pump, wherein the flow rate is controlled to be 0.4 mL/min.
Preparation work before testing: and after the two poles of the MRC battery are connected with a 50 omega resistor, the anolyte is replaced. The anode potential and the cross-terminal voltage of the MRC were scanned every 10S using agilent 34970 a. The test was started with the cathode at around 150mV, when the anode potential reached around-300 mV.
The resistance of the resistance box is adjusted to 10 omega, and Data are recorded when a Data image is close to a straight line by observing the trend of a Data curve in Agilent 34970A benchmark Data Logger software. Then, the resistance of the resistance box is adjusted to 20 Ω, 30 Ω, 40 Ω, 50 Ω, 75 Ω, 100 Ω, 200 Ω, 300 Ω, 400 Ω, 600 Ω, 1000 Ω, 2000 Ω, 3000 Ω, and the anode potential and the voltage data at the cathode and anode terminals are recorded.
As can be seen from fig. 5, the electricity generation performance of the microbial reverse electrodialysis cell 1 is greatly improved over the MFC without the module.
Referring to FIG. 6, FIG. 6 is a diagram showing the desalting effect of the present invention.
Before the experiment, 1mol/L NaCl solution is prepared and then injected into the middle chamber of ED and filled. And a 0.5mmol/L potassium ferricyanide solution is introduced into a cathode chamber of the ED, and a 0.5mmol/L potassium ferrocyanide solution is introduced into an anode chamber of the ED. Four MRCs are connected in series and then connected to two ends of the ED for desalting, and the anode potential and the two-end voltage of the MRC are scanned once every 30S by using Agilent 34970A so as to monitor whether the MRC works normally or not. Sampling the solution from the middle chamber of ED every 2 hours, measuring the salinity by using a Hash HQ40D conductivity meter to obtain the salinity of the solution at the moment, recording the data, and finally obtaining the salt rejection rate of 10 hours.
As can be seen from FIG. 6, the present invention has a good desalting effect.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. The utility model provides a joint desalination effluent disposal system of synchronous recovery salt difference ability and chemical energy in sewage, comprises microorganism reverse electrodialysis pond (1) and electrodialysis cell (2), its characterized in that:
the microorganism reverse electrodialysis cell (1) is used for recovering salt difference energy between the high-concentration salt wastewater and the low-concentration salt fresh water and chemical energy of organic matters in the high-concentration salt wastewater and generating electric energy;
the electrodialysis cell (2) is used for desalting the high-salinity wastewater by using the electric energy generated by the microorganism reverse electrodialysis cell (1);
the microbial reverse electrodialysis cell comprises an anode chamber (3) and a cathode chamber (13), the anode chamber (3) and the cathode chamber (13) being separated by a membrane group (14); an anode carbon brush (15) is arranged in the anode chamber (3), and electrogenic microorganisms are attached to the surface of the anode carbon brush (15); an air cathode (12) is arranged in the cathode chamber (13); the membrane group (14) comprises an anion exchange membrane (8), a cation exchange membrane (9), a high-concentration salt wastewater runner and a low-concentration salt fresh water runner;
a second cation exchange membrane (21) and a second anion exchange membrane (22) are arranged in the electrodialysis cell (2), and the electrodialysis cell (2) is divided into an anode chamber (6), a desalting chamber (7) and a cathode chamber (16) by the second anion exchange membrane (22) and the second cation exchange membrane (21); the cathode chamber and the anode chamber are respectively provided with a cathode electrode and an anode electrode; the cathode electrode and the anode electrode are respectively connected with an anode carbon brush (15) and an air cathode (12) of the microbial reverse electrodialysis cell (1) to receive electric energy generated by the microbial reverse electrodialysis cell (1);
high-concentration salt wastewater and low-concentration salt fresh water are pumped into a membrane group (14) and flow along a high-concentration salt wastewater flow passage and a low-concentration salt fresh water flow passage respectively, and due to different salt concentrations in the high-concentration salt wastewater and the low-concentration salt fresh water, the generated salt difference can enable cations in the high-concentration salt wastewater and the low-concentration salt fresh water to exchange cations through cationsThe membrane enters a cathode chamber (13), anions enter an anode chamber (3) through an anion exchange membrane, and the directional movement of cations and anions generates electric energy; high-concentration salt wastewater discharged after the salt difference energy is recovered by the module (14) enters the desalting chamber (7) of the electrodialysis cell (2), and Na in the high-concentration salt wastewater in the desalting chamber (7)+And Cl-The water respectively migrates to the cathode chamber (16) and the anode chamber (6) through a second cation exchange membrane (21) and a second anion exchange membrane (22) respectively to realize desalination treatment;
desalting the high-concentration salt wastewater to obtain low-salt wastewater, pumping the low-salt wastewater into an anode chamber (3) of the microorganism reverse electrodialysis cell (1), providing organic matters for electrogenesis microorganisms attached to an anode carbon brush (15), degrading the organic matters at the same time, and discharging the obtained low-salt low-organic matter wastewater; in addition, the positive ions and the negative ions in the module (14) move directionally, and the potential difference generated at the two ends of the module enhances the transmission of the ions and the movement of electrons in an external circuit, and plays the role of an internal power supply so as to improve the rate of degrading organic matters and the electricity generation performance of the anode carbon brush (15);
the combined desalination wastewater treatment system utilizes a microorganism reverse electrodialysis cell to treat high-concentration salt wastewater generated, and simultaneously recovers salt difference energy and chemical energy in organic wastewater, so as to realize synchronous recovery of the chemical energy and the salt difference energy in the wastewater; and the electric energy of the microorganism reverse electrodialysis cell is applied to the electrodialysis cell, so that the in-situ utilization of the electric energy is realized.
2. The combined desalination wastewater treatment system for synchronously recycling salt difference energy and chemical energy in sewage as claimed in claim 1, characterized in that:
the desalting chamber (7) is provided with a wastewater electrodialysis liquid inlet and outlet (19);
the membrane group (14) is provided with a high-concentration salt waste water outlet (4), a low-concentration salt fresh water inlet (5), a high-concentration salt waste water inlet (10) and a low-concentration salt fresh water outlet (11); the high-concentration salt wastewater outlet (4) is communicated with the high-concentration salt wastewater inlet (10) through a high-concentration salt wastewater runner arranged in the membrane group, and the low-concentration salt fresh water inlet (5) is communicated with the low-concentration salt fresh water outlet (11) through a low-concentration salt fresh water runner arranged in the membrane group.
3. The combined desalination wastewater treatment system for synchronously recycling salt difference energy and chemical energy in wastewater as claimed in claim 1 or 2, characterized in that: the membrane group (14) comprises a plurality of membrane group units; an anion exchange membrane (8), a first silica gel sheet (26), a cation exchange membrane (9) and a second silica gel sheet (27) are alternately arranged in each membrane group unit;
the first silica gel sheet (26) is provided with a high-concentration salt wastewater runner (25) and two low-concentration salt fresh water through holes (24); the second silica gel sheet (27) is provided with a low-concentration salt fresh water runner (29) and two high-concentration salt waste water through holes (30); the two low-concentration salt and fresh water through holes (24) respectively correspond to the outflow end and the inflow end of a low-concentration salt and fresh water flow channel (29) arranged on the second silica gel sheet (27); the two high-concentration salt wastewater through holes (30) respectively correspond to the outflow end and the inflow end of a high-concentration salt wastewater runner (25) arranged on the first silica gel sheet (26);
the anion exchange membrane (8) is provided with a first through hole and a second through hole, and the first through hole corresponds to the outflow end of the high-concentration salt wastewater runner (25) arranged on the first silica gel sheet (26); the holes II correspond to the inflow ends of low-concentration salt fresh water flow passages (29) arranged on the second silica gel sheet (27); and a third through hole and a fourth through hole are formed in the cation exchange membrane (9), the third through hole corresponds to the inflow end of a high-concentration salt wastewater runner (25) arranged on the first silica gel sheet (26), and the fourth through hole corresponds to the outflow end of a low-concentration salt fresh water runner (29) arranged on the second silica gel sheet (27).
4. The combined desalination wastewater treatment system for synchronously recycling salt difference energy and chemical energy in sewage as claimed in claim 1, characterized in that: more than two reverse electrodialysis cells (1) for the microorganisms are arranged; the electrodes of all the microorganism reverse electrodialysis cells are connected in series.
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