CN112624234B - System and method for treating organic wastewater by using low-grade heat energy - Google Patents
System and method for treating organic wastewater by using low-grade heat energy Download PDFInfo
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- CN112624234B CN112624234B CN202011359045.XA CN202011359045A CN112624234B CN 112624234 B CN112624234 B CN 112624234B CN 202011359045 A CN202011359045 A CN 202011359045A CN 112624234 B CN112624234 B CN 112624234B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention belongs to the technical field of low-grade heat energy utilization, and relates to a system and a method for treating organic wastewater by using low-grade heat energy. The whole system consists of an air gap diffusion distiller, a reverse electrodialysis reactor, a heater, a cooler, a liquid storage tank, a solution pump, a pipeline and the like. The method is characterized in that the initial solution is concentrated to a given concentration in an air gap diffusion distiller while product water is separated out and stored in a concentrated solution storage tank and a dilute solution storage tank. When the liquid storage amount of the concentrated solution storage tank and the dilute solution storage tank reaches a set value, releasing the concentrated solution and the dilute solution to enter a reverse electrodialysis reactor for concentration energy utilization, and carrying out redox reaction at the anode and the cathode to degrade organic wastewater; then the dilute and concentrated solution flowing out from the reverse electrodialysis device is stored in respective independent liquid outlet tanks for continuous recycling. The invention effectively utilizes low-grade heat energy, can realize the treatment of organic wastewater by utilizing the low-grade heat energy and protect the environment; closed circulation and automatic control; simple and compact structure, quiet running and convenient operation.
Description
Technical Field
The invention belongs to the technical field of low-grade heat energy utilization, and relates to a system and a method for treating organic wastewater by using low-grade heat energy.
Background
A large amount of low-grade waste heat can be generated in industrial production, the utilization difficulty is high, and if the part of waste heat is directly subjected to cold treatment and discharged, not only is the energy consumption increased, but also the heat pollution to the environment is increased. If a large amount of waste heat discharged to the environment during the operation of the factory is utilized, the waste heat of the environment can be effectively controlled and can be converted into other available energy sources. The theory of the invention relates to two aspects: firstly, low-grade heat energy is utilized to generate salt difference energy; secondly, the utilization and transformation of salt difference. The methods for generating salt difference energy by common solutions can be roughly divided into two types: solute separation and solvent separation. The solute separation method is to separate unstable substances from a solution under the action of heat and then absorb the substances again, so as to realize separation and concentration. Solute separation methods are often limited to volatile and easily pyrolyzable solutes. Therefore, the solvent separation method is more general, and the common solvent separation methods can be divided into two main types: thermal distillation and membrane distillation. The thermal distillation typically includes low-temperature multi-effect distillation and multi-effect flash distillation. However, in order to separate the solvent with higher boiling point, it is inevitable to maintain a certain vacuum degree, which requires adding metal consumables into the thermal distillation apparatus to satisfy the requirements of higher rigidity and air tightness, but this will result in higher cost and low cost performance of the thermal distillation apparatus. The membrane distillation method has been developed relatively rapidly in recent years. In the early stage, direct contact membrane distillation is mostly adopted, and then, various membrane distillation modes such as air gap type membrane distillation, scavenging type membrane distillation, vacuum membrane distillation and the like appear on the right side. Compared with thermal distillation, the membrane distillation method has a more compact structure and is convenient to operate and maintain, but membrane components required by membrane distillation are higher in price, distillation flux is less, the surface of the membrane is easy to scale, and the service life is influenced. The air gap diffusion distillation method is a novel distillation method appearing in recent years, and compared with the traditional thermal method distillation method, the air gap diffusion distillation method does not need a certain vacuum degree, and can realize distillation under normal pressure, which means that the air gap diffusion distillation device has lower requirements on the rigidity of materials. On the other hand, the air gap diffusion distillation adopts the conventional porous material which has higher popularization value compared with the membrane distillation method. The osmotic pressure energy method and the reverse electrodialysis method mainly use a permeable membrane are still studied more at present. Therefore, the air gap diffusion distiller is coupled with the reverse electrodialysis reactor to form a technology and a method for degrading organic wastewater by utilizing low-grade heat energy to drive and generate concentration energy.
Disclosure of Invention
In order to realize the treatment of organic wastewater by using low-grade heat energy, the invention designs a system and a method for generating concentration energy by driving low-grade heat energy and treating organic wastewater by using the concentration energy. The system adopts low-grade heat energy as driving force to realize solvent separation in an air gap diffusion distiller; along with the continuous circulation of the solution, the solution in the hot runner is continuously concentrated, and meanwhile, the steam containing a small amount of solute is continuously condensed to form product water and then is recovered; and (3) introducing the dilute solution and the concentrated solution into the reverse electrodialysis reactor after the dilute solution and the concentrated solution reach the required concentration, consuming concentration difference energy to carry out organic wastewater treatment, and realizing closed circulation.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a system for treating organic wastewater by using low-grade heat energy comprises a heater A, a heater B, an air gap diffusion distiller A, an air gap diffusion distiller B, a cooler A, a cooler B, a circulation box A, a circulation box B, a circulation pump A, a circulation pump B, a conductivity meter A, a conductivity meter B, a conductivity meter C, a three-way electromagnetic valve A, a three-way electromagnetic valve B, an electro-hydraulic proportional valve, a product water tank, a concentrated solution outlet box A, a dilute solution outlet box B, a dilute solution replenishing pump A, a concentrated solution replenishing pump B, a dilute solution storage box A, a concentrated solution storage box B, a solution dilute pump C, a concentrated solution pump D and a reverse electrodialysis reactor.
The heater A is connected with the cooler A through the air gap diffusion distiller A, the heater B is connected with the cooler B through the air gap diffusion distiller B, the cooler A is connected with the circulation box A, the circulation box A is internally provided with the conductivity meter A, the cooler B is connected with the circulation box B, and the circulation box B is internally provided with the conductivity meter B; the circulating box A and the circulating box B are respectively connected with a concentrated solution replenishing pump B through a three-way electromagnetic valve A and a three-way electromagnetic valve B, and the concentrated solution replenishing pump B is connected with a concentrated solution storage tank B through a pipeline. The concentrated solution storage tank B is connected with the reverse electrodialysis reactor through a concentrated solution pump D. The reverse electrodialysis reactor is connected with the circulation box A and the cooler A through a dilute solution outlet box B, an electro-hydraulic proportional valve and a circulation pump A. The reverse electrodialysis reactor is connected with the electro-hydraulic proportional valve through a dilute solution pump C, a dilute solution storage tank A and a dilute solution supply pump A, and the product water tank is connected with the air gap diffusion distiller A and the air gap diffusion distiller B. The reverse electrodialysis reactor is connected with a circulating box B and a cooler B through a dilute solution liquid outlet box A and a circulating pump B.
A method for using a system for treating organic wastewater by using low-grade heat energy can realize solution separation under the drive of the low-grade heat energy, and a method for treating the organic wastewater by using concentration energy after generating the concentration energy of the solution comprises the following steps:
the first step is as follows: the method comprises the following steps that initial solution is respectively filled in a circulation box A and a circulation box B for storage, a three-way electromagnetic valve A and a three-way electromagnetic valve B are connected during working, the initial solution respectively enters a cooler A and a cooler B for cooling to form cold flow under the driving of the circulation pump A and the circulation pump B, and then enters condensers of an air gap diffusion distiller A and an air gap diffusion distiller B for heat absorption and temperature rise; and heating the heated cold flow strand by a heater A and a heater B to form hot flow, and then introducing the hot flow into porous evaporators of the air gap diffusion distiller A and the air gap diffusion distiller B again.
Due to the temperature difference effect between the hot stream and the cold stream, water vapor flows to the surface of the condenser from the porous evaporator interface under the driving of the steam pressure difference, product water is formed on the surface of the condenser, and the cold stream in the condenser is heated; the product water is collected in a product water tank. And the outlet heat flow strands of the porous evaporator respectively flow through the cooler A and the cooler B and are cooled to form cold flow streams, the cold flow streams flow through the three-way electromagnetic valve A and the three-way electromagnetic valve B, are driven by the circulating pump A and the circulating pump B to enter the circulating box A and the circulating box B again, and enter the air gap diffusion distiller A and the air gap diffusion distiller B after being cooled by the cooler A and the cooler B for next circulation. After multiple cycles, respectively using a conductivity meter A and a conductivity meter B to monitor the conductivity of the solution in the circulation box A and the circulation box B in real time, and when the salinity of the concentrated solution meets the set value; disconnecting the three-way electromagnetic valve A and the three-way electromagnetic valve B, and starting the concentrated solution replenishing pump B to make the concentrated solution in the circulation box A and the circulation box B flow to the concentrated solution storage box B; and the product water flowing out of the air gap diffusion distiller A and the air gap diffusion distiller B enters a product water tank, and the diluted solution after proportioning in the product water tank is conveyed to a diluted solution storage tank A through a diluted solution supply pump A.
The second step is that: the solution in the dilute solution storage tank A and the solution in the concentrated solution storage tank B are respectively driven by a dilute solution pump C and a concentrated solution pump D to enter the reverse electrodialysis reactor, potential difference is formed under the action of the anion-cation exchange membrane, redox reaction is carried out between the anode and the cathode to degrade organic wastewater, and power supply to an external load can be realized.
The third step: the secondary concentrated solution and the secondary diluted solution flowing out of the reverse electrodialysis reactor are respectively stored in a concentrated solution outlet box A and a diluted solution outlet box B. A certain amount of secondary concentrated solution is conveyed to an air gap diffusion distiller B through a circulating pump B; distributing a certain amount of secondary dilute solution through an electro-hydraulic proportional valve by using a circulating pump A, and then feeding the secondary dilute solution into an air gap diffusion distiller A; concentration of the solution was then achieved in air gap diffusion distiller a and air gap diffusion distiller B. At the moment, the three-way electromagnetic valve A and the three-way electromagnetic valve B are communicated, and the solution which is circulated for many times is detected by a conductivity meter A and a conductivity meter B in the circulation box A and the circulation box B to meet the salinity given value of the concentrated solution under the driving of the circulation pump A and the circulation pump B; then disconnecting the three-way electromagnetic valve A and the three-way electromagnetic valve B, and starting the concentrated solution replenishing pump B to make the concentrated solution in the circulation box A and the circulation box B flow to the concentrated solution storage box B; the proportioned dilute solution in the product water tank is conveyed to a dilute solution storage tank A through a dilute solution replenishing pump A.
It is worth noting that since the outlet solution in the reverse electrodialysis reactor still has a certain concentration energy, if the outlet solution is separated after being mixed, the workload of the air gap diffusion distiller is increased, which leads to the reduction of the thermal separation efficiency; therefore, two air gap diffusion distillation devices are arranged in the process of the invention, and the secondary concentrated solution and the secondary diluted solution at the outlet of the reverse electrodialysis reactor are separated independently. In addition, an electro-hydraulic proportional valve is additionally arranged for maintaining the stability of the reverse electrodialysis reactor, product water and part of secondary dilute solution at an outlet are mixed to form stable dilute solution, and then the stable dilute solution is conveyed by a dilute solution replenishing pump A and stored in a dilute solution storage tank A. Meanwhile, the concentrated solution generated after being concentrated to the salinity of a given value flows through the three-way electromagnetic valve A and the three-way electromagnetic valve B and is conveyed to the concentrated solution storage tank B by the concentrated solution replenishing pump B, so that closed circulation is completed, and the process of treating the organic wastewater by low-grade heat energy is realized.
The driving heat sources of the heater A and the heater B can be various low-grade heat sources such as hot water, flue gas, exhaust steam, heat-carrying media and the like.
The initial solution can be pretreated seawater or chlorine-containing saline solution, and can meet the requirements that the initial solution and pipelines in the device cannot chemically react with the constituent materials of all equipment and cannot corrode the equipment.
The degradable organic wastewater can be organic dye, medical wastewater, wastewater containing phenol and cyanide and the like.
The invention has the beneficial effects that:
(1) various low-grade heat energy (hot water, flue gas, exhaust steam, heat-carrying medium and the like) is effectively utilized as a heating heat source, so that energy is saved; (2) the organic wastewater (organic dye, medical wastewater, wastewater containing phenol and cyanide and the like) can be treated by using low-grade heat energy, and the environment is protected; (3) closed circulation and automatic control; (4) the system has simple structure, compact equipment, convenient operation and low manufacturing cost; (5) the system has small floor area, quiet running, normal-pressure operation and wide application range.
Drawings
FIG. 1 is a flow chart of a system for coupling an air gap diffusion distiller with a reverse electrodialysis reactor.
FIG. 2 is a schematic diagram of the operation of a reverse electrodialysis reactor.
In the figure: 1, a heater A; 2, a heater B; 3 air gap diffusion distiller A; 4 air gap diffusion distiller B; 5, a cooler A; 6, a cooler B; 7, a circulation box A; 8 circulation boxes B, 9 circulation pumps A; 10 circulating pump B, 11 conductivity meter A; 12 conductivity meter B; 13 conductivity meter C; 14, a three-way electromagnetic valve A; 15 three-way electromagnetic valve B; 16 electrohydraulic proportional valves, 17 product water tanks; 18 concentrated solution outlet box A; 19 a dilute solution outlet box B and 20 a dilute solution supply pump A; a 21 concentrated solution replenishing pump B and a22 dilute solution storage tank A; 23 a concentrated solution storage tank B, and 24 a dilute solution pump C; 25 concentrated solution pump D; 26 reverse electrodialysis reactor; 1c an air pump; 2c, 2 d-cathode and anode electrode plates; 3c, 3 d-cathode and anode electrode chambers; 4c, 4 d-anion, cation exchange membranes; 5c, 5 d-lean, rich flow-path compartments.
The direction indicated by the arrow in fig. 1 is the flow direction of the stream, the single short dashed line is the cold stream, the solid line is the hot stream, the double dashed line is the product water stream, the double dashed line is the concentrated solution stream, and the single long dashed line is the dilute solution stream. The hollow white flow channel of the air gap diffusion distiller is a condenser, and the shadow flow channel is a porous evaporator.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The following describes the specific implementation process of the present invention in detail with reference to the technical scheme and the attached drawings.
A system for treating organic wastewater by using low-grade heat energy comprises a heater A1, a heater B2, an air gap diffusion distiller A3, an air gap diffusion distiller B4, a cooler A5, a cooler B6, a circulation box A7, a circulation box B8, a circulation pump A9, a circulation pump B10, a conductivity meter A11, a conductivity meter B12, a conductivity meter C13, a three-way electromagnetic valve A14, a three-way electromagnetic valve B15, an electro-hydraulic proportional valve 16, a product water tank 17, a concentrated solution outlet box A18, a dilute solution outlet box B19, a dilute solution supply pump A20, a concentrated solution supply pump B21, a dilute solution storage box A22, a concentrated solution storage box B23, a dilute solution pump C24, a concentrated solution pump D25 and a reverse electrodialysis reactor 26.
The heater A1 is connected with a cooler A5 through the air gap diffusion distiller A3, the heater B2 is connected with a cooler B6 through the air gap diffusion distiller B4, the cooler A5 is connected with a circulation box A7, a conductivity meter A11 is arranged in the circulation box A7, the cooler B6 is connected with a circulation box B8, and a conductivity meter B12 is arranged in the circulation box B8; the circulation tank A7 and the circulation tank B8 are respectively connected with a concentrated solution replenishing pump B21 through a three-way electromagnetic valve A14 and a three-way electromagnetic valve B15, and the concentrated solution replenishing pump B21 is connected with a concentrated solution storage tank B23 through a pipeline. The concentrated solution storage tank B23 is connected to the reverse electrodialysis reactor 26 by a concentrated solution pump D25. The reverse electrodialysis reactor 26 is connected with a circulation box A7 through a dilute solution outlet box B19, an electro-hydraulic proportional valve 16 and a circulation pump A9. The reverse electrodialysis reactor 26 is connected with the electro-hydraulic proportional valve 16 through a dilute solution pump C24, a dilute solution storage tank A22, a dilute solution supply pump A20 and a product water tank 17. The reverse electrodialysis reactor 26 is connected to a cooler B6 via a concentrated solution outlet tank a18 and a circulation pump B10.
A use method of a system for treating organic wastewater by using low-grade heat energy comprises the following steps:
the first step is as follows: the initial solution is respectively filled in a circulation box A7 and a circulation box B8 for storage, a three-way electromagnetic valve A14 and a three-way electromagnetic valve B15 are switched on during operation, under the driving of the circulation pump A9 and the circulation pump B10, the initial solution respectively enters a cooler A5 and a cooler B6 for cooling to form cold flow, and then enters condensers of an air gap diffusion distiller A3 and an air gap diffusion distiller B4 for heat absorption and temperature rise; the heated cold flow strand is heated by a heater A1 and a heater B2 to form a hot flow, and then the hot flow is introduced into porous evaporators of an air gap diffusion distiller A3 and an air gap diffusion distiller B4 again.
Due to the temperature difference effect between the hot stream and the cold stream, water vapor flows to the surface of the condenser from the porous evaporator interface under the driving of the steam pressure difference, product water is formed on the surface of the condenser, and the cold stream in the condenser is heated; the product water is collected in the product water tank 17. The outlet heat flow strand of the porous evaporator respectively flows through a cooler A5 and a cooler B6 and is cooled to form a cold flow stream, the cold flow stream flows through a three-way electromagnetic valve A14 and a three-way electromagnetic valve B15, is driven by a circulating pump A9 and a circulating pump B10 to enter a circulating box A7 and a circulating box B8 again, and is cooled by the cooler A5 and a cooler B6 to enter an air gap diffusion distiller A3 and an air gap diffusion distiller B4 for the next circulation. After multiple cycles, the conductivity of the solution in the circulation box A7 and the circulation box B8 is monitored in real time by using a conductivity meter A11 and a conductivity meter B12 respectively, and when the salinity given value of the concentrated solution is met through detection; disconnecting the three-way electromagnetic valve A14 and the three-way electromagnetic valve B15, and starting the concentrated solution replenishing pump B21 to make the concentrated solution in the circulation tank A7 and the circulation tank B8 flow to the concentrated solution storage tank B23; the product water flowing out of the air gap diffusion distiller A3 and the air gap diffusion distiller B4 enters the product water tank 17, the product water in the product water tank 17 passes through the electro-hydraulic proportional valve 16 to be mixed with a certain amount of secondary dilute solution to form dilute solution, the dilute solution meets the dilute solution salinity given value through the detection of the conductivity meter C13, and the dilute solution is conveyed into the dilute solution storage tank A22 through the dilute solution replenishing pump A20.
The second step is that: the solutions in the dilute solution storage tank A22 and the concentrated solution storage tank B23 are respectively driven by a dilute solution pump C24 and a concentrated solution pump D25 to enter the reverse electrodialysis reactor 26, potential difference is formed under the action of the anion-cation exchange membrane, redox reaction is carried out between the anode and the cathode to degrade organic wastewater, and power supply to an external load can be realized.
The third step: the second concentrated and second dilute solutions from the reverse electrodialysis reactor 26 are stored in a concentrated and a dilute solution outlet tank A18 and B19, respectively. A certain amount of secondary concentrated solution is conveyed to an air gap diffusion distiller B4 through a circulating pump B10; distributing a certain amount of secondary dilute solution through an electro-hydraulic proportional valve 16 by a circulating pump A9, and then entering an air gap diffusion distiller A3; concentration of the solution was then achieved in air gap diffusion still a3 and air gap diffusion still B4. At the moment, a three-way electromagnetic valve A14 and a three-way electromagnetic valve B15 are switched on, and under the driving of a circulating pump A9 and a circulating pump B10, the solution which is circulated for many times meets the salinity given value of the concentrated solution through a conductivity meter A11 and a conductivity meter B12 in a circulating tank A7 and a circulating tank B8; then disconnecting the three-way electromagnetic valve A14 and the three-way electromagnetic valve B15, and starting the concentrated solution replenishing pump B21 to make the concentrated solution in the circulation tank A7 and the circulation tank B8 flow to the concentrated solution storage tank B23; the product water in the product water tank 17 is mixed with a certain amount of sub-dilute solution through the electro-hydraulic proportional valve 16 to form dilute solution, the dilute solution meets the salinity given value of the dilute solution through the detection of a conductivity meter C13, and the dilute solution meets the salinity given value of the dilute solution and is conveyed into a dilute solution storage tank A22 through a dilute solution replenishing pump A20.
It is worth noting that since the outlet solution in the reverse electrodialysis reactor still has a certain concentration energy, if the outlet solution is separated after being mixed, the workload of the air gap diffusion distiller is increased, which leads to the reduction of the thermal separation efficiency; therefore, two air gap diffusion distillation devices are arranged in the process of the invention, and the secondary concentrated solution and the secondary diluted solution at the outlet of the reverse electrodialysis reactor are separated independently. In addition, an electro-hydraulic proportional valve 16 is additionally arranged for maintaining the stability of the reverse electrodialysis reactor, product water is mixed with part of the secondary dilute solution at the outlet to form stable dilute solution, and then the stable dilute solution is conveyed by a dilute solution supply pump A20 and stored in a dilute solution storage tank A22. Meanwhile, the concentrated solution generated after being concentrated to the salinity of a given value flows through the three-way electromagnetic valve A14 and the three-way electromagnetic valve B15 and is conveyed to the concentrated solution storage tank B23 by the concentrated solution supply pump B21, closed circulation is completed, and the process of treating the organic wastewater by low-grade heat energy is realized.
The driving heat sources of the heater A1 and the heater B2 can be various low-grade heat sources such as hot water, flue gas, dead steam, heat-carrying media and the like.
The initial solution can be pretreated seawater or chlorine-containing saline solution, and can meet the requirements that the initial solution and pipelines in the device cannot chemically react with the constituent materials of all equipment and cannot corrode the equipment.
The degradable organic wastewater can be organic dye, medical wastewater, wastewater containing phenol and cyanide and the like.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.
Claims (5)
1. The use method of the system for treating the organic wastewater by using the low-grade heat energy is characterized by comprising the following steps of:
the first step is as follows: the method comprises the following steps that initial solution is respectively filled in a circulation box A (7) and a circulation box B (8) for storage, a three-way electromagnetic valve A (14) and a three-way electromagnetic valve B (15) are connected during working, the initial solution respectively enters a cooler A (5) and a cooler B (6) for cooling to form cold flow under the driving of a circulation pump A (9) and a circulation pump B (10), and then enters condensers of an air gap diffusion distiller A (3) and an air gap diffusion distiller B (4) for heat absorption and temperature rise; heating the heated cold flow strand by a heater A (1) and a heater B (2) to form hot flow, and then introducing the hot flow into porous evaporators of an air gap diffusion distiller A (3) and an air gap diffusion distiller B (4) again;
due to the temperature difference effect between the hot stream and the cold stream, water vapor flows to the surface of the condenser from the porous evaporator interface under the driving of the steam pressure difference, product water is formed on the surface of the condenser, and the cold stream in the condenser is heated; the product water is collected in a product water tank (17); the outlet heat flow strands of the porous evaporator respectively flow through a cooler A (5) and a cooler B (6) and then are cooled to form cold flows, the cold flows flow through a three-way electromagnetic valve A (14) and a three-way electromagnetic valve B (15), are driven by a circulating pump A (9) and a circulating pump B (10) to enter a circulating box A (7) and a circulating box B (8) again, and are cooled by the cooler A (5) and the cooler B (6) to enter an air gap diffusion distiller A (3) and an air gap diffusion distiller B (4) for the next circulation; after multiple cycles, the conductivity of the solution in the circulation box A (7) and the conductivity of the solution in the circulation box B (8) are monitored in real time by using a conductivity meter A (11) and a conductivity meter B (12) respectively, and when the salinity of the concentrated solution meets a set value; disconnecting the three-way electromagnetic valve A (14) and the three-way electromagnetic valve B (15), and starting the concentrated solution replenishing pump B (21) to make the concentrated solution in the circulating tank A (7) and the circulating tank B (8) flow into the concentrated solution storage tank B (23); the product water flowing out of the air gap diffusion distiller A (3) and the air gap diffusion distiller B (4) enters a product water tank (17), the product water in the product water tank (17) is mixed with a certain amount of sub-dilute solution through an electro-hydraulic proportional valve (16) to form dilute solution, the salinity given value of the dilute solution is met through detection of a conductivity meter C (13), and the dilute solution is conveyed into a dilute solution storage tank A (22) through a dilute solution replenishing pump A (20);
the second step is that: the solutions in the dilute solution storage tank A (22) and the concentrated solution storage tank B (23) are respectively driven by a dilute solution pump C (24) and a concentrated solution pump D (25) to enter a reverse electrodialysis reactor (26), a potential difference is formed under the action of an anion-cation exchange membrane, redox reaction is carried out on the anode and the cathode to degrade organic wastewater, and power supply to an external load can be realized;
the third step: the secondary concentrated solution and the secondary diluted solution flowing out of the reverse electrodialysis reactor (26) are respectively stored in a concentrated solution outlet box A (18) and a diluted solution outlet box B (19); a certain amount of secondary concentrated solution is conveyed into an air gap diffusion distiller B (4) through a circulating pump B (10); distributing a certain amount of secondary dilute solution through an electro-hydraulic proportional valve (16) by a circulating pump A (9) and then entering an air gap diffusion distiller A (3); then the solution concentration is realized in an air gap diffusion distiller A (3) and an air gap diffusion distiller B (4); at the moment, a three-way electromagnetic valve A (14) and a three-way electromagnetic valve B (15) are switched on, and under the driving of a circulating pump A (9) and a circulating pump B (10), the solution subjected to multiple cycles meets the salinity given value of the concentrated solution through the detection of a conductivity meter A (11) and a conductivity meter B (12) in a circulating box A (7) and a circulating box B (8); then disconnecting the three-way electromagnetic valve A (14) and the three-way electromagnetic valve B (15), and starting the concentrated solution replenishing pump B (21) to make the concentrated solution in the circulating tank A (7) and the circulating tank B (8) flow into the concentrated solution storage tank B (23); the product water flowing out of the air gap diffusion distiller A (3) and the air gap diffusion distiller B (4) enters a product water tank (17), the product water in the product water tank (17) is mixed with a certain amount of sub-dilute solution through an electro-hydraulic proportional valve (16) to form dilute solution, the salinity given value of the dilute solution is met through detection of a conductivity meter C (13), and the dilute solution is conveyed into a dilute solution storage tank A (22) through a dilute solution replenishing pump A (20);
the system for treating the organic wastewater by using the low-grade heat energy comprises a heater A (1), a heater B (2), an air gap diffusion distiller A (3), an air gap diffusion distiller B (4), a cooler A (5), a cooler B (6), a circulating box A (7), a circulating box B (8), a circulating pump A (9), a circulating pump B (10), an electrical conductivity meter A (11), an electrical conductivity meter B (12) and an electrical conductivity meter C (13), the device comprises a three-way electromagnetic valve A (14), a three-way electromagnetic valve B (15), an electro-hydraulic proportional valve (16), a product water tank (17), a concentrated solution outlet tank A (18), a dilute solution outlet tank B (19), a dilute solution replenishing pump A (20), a concentrated solution replenishing pump B (21), a dilute solution storage tank A (22), a concentrated solution storage tank B (23), a dilute solution pump C (24), a concentrated solution pump D (25) and a reverse electrodialysis reactor (26);
the heater A (1) is connected with a cooler A (5) through the air gap diffusion distiller A (3), the heater B (2) is connected with a cooler B (6) through the air gap diffusion distiller B (4), the cooler A (5) is connected with a circulation box A (7), a conductivity meter A (11) is arranged in the circulation box A (7), the cooler B (6) is connected with a circulation box B (8), and a conductivity meter B (12) is arranged in the circulation box B (8); the circulation box A (7) and the circulation box B (8) are respectively connected with a concentrated solution replenishing pump B (21) through a three-way electromagnetic valve A (14) and a three-way electromagnetic valve B (15), and the concentrated solution replenishing pump B (21) is connected with a concentrated solution storage tank B (23) through a pipeline; the concentrated solution storage tank B (23) is connected with the reverse electrodialysis reactor (26) through a concentrated solution pump D (25); the reverse electrodialysis reactor (26) is connected with the circulation box A (7) and the cooler A (5) through a dilute solution outlet box B (19), an electro-hydraulic proportional valve (16) and a circulation pump A (9); the reverse electrodialysis reactor (26) is connected with the electro-hydraulic proportional valve (16) through a dilute solution pump C (24), a dilute solution storage tank A (22) and a dilute solution replenishing pump A (20), and the product water tank (17) is connected with the air gap diffusion distiller A (3) and the air gap diffusion distiller B (4); the reverse electrodialysis reactor (26) is connected with a circulating box B (8) and a cooler B (6) through a concentrated solution outlet box A (18) and a circulating pump B (10).
2. The method for using the system for treating organic wastewater by using low-grade heat energy as claimed in claim 1, wherein the driving heat sources of the heater A (1) and the heater B (2) are various low-grade heat sources such as hot water, flue gas, dead steam and heat-carrying media.
3. The use method of the system for treating organic wastewater by using low-grade heat energy according to claim 1 or 2, wherein the initial solution is pretreated seawater and chlorine-containing saline solution, and the requirement that the chemical reaction cannot occur and the corrosion cannot occur on the component materials of the equipment and the pipeline in the device is met.
4. The method of using a system for treating organic wastewater with low-grade heat energy according to claim 1 or 2, wherein the degradable organic wastewater is organic dye, medical wastewater, and wastewater containing phenol and cyanide.
5. The method of claim 3, wherein the degradable organic waste water is organic dye, medical waste water, phenol and cyanide containing waste water.
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