CN108439512B - Thermal-drive high-salinity high-organic-matter wastewater zero-discharge treatment process - Google Patents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention discloses a thermally-driven high-salinity high-organic matter wastewater zero-discharge treatment process, which specifically comprises the following steps of: after high-salinity high-organic-matter wastewater at a certain temperature to be treated is filtered and pretreated, the high-salinity high-organic-matter wastewater sequentially enters a first effect humidifier, a second effect humidifier and a third effect humidifier for concentration, and hot humid air generated by the first effect humidifier returns to the first effect humidifier after being cooled and dehumidified by a first effect dehumidifier; the hot humid air generated by the second effect humidifier returns to the second effect humidifier after being cooled and dehumidified by the waste heat recovery device; the hot humid air generated by the third-effect humidifier is directly discharged to the atmosphere, the high-salt high-organic wastewater which is generated at the bottom and is close to a saturated state enters a crystallization tank, the temperature is reduced at room temperature, and the generated crystallized salt enters a desalting treatment process. The process has the advantages of simple flow, convenient operation, no addition of chemical agents, high mass and heat transfer efficiency, small equipment investment, small occupied area, energy conservation, consumption reduction, long-term stable operation and wide application range.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a zero-discharge treatment process for high-salinity high-organic-matter wastewater.
Background
The wastewater discharged in the production process of the industries such as petrochemical industry, coal chemical industry, metallurgy, pharmacy, printing and dyeing, papermaking and the like has the characteristics of high salt and high organic matter, the salt content is usually more than 3000mg/L, the COD is more than 2000mg/L, the temperature is high, a large amount of toxic and harmful organic matters such as aromatic compounds, heterocyclic compounds, hydrocarbon compounds and the like are contained, and the potential safety hazard to the water environment can be still caused even if the wastewater is discharged into a water body after treatment. Therefore, many local governments require that such enterprises must achieve zero liquid discharge, referred to as zero discharge.
At present, the zero-emission treatment process for high-salt high-organic-matter wastewater generally comprises a series of process units such as heat exchange cooling treatment, pretreatment, biochemical treatment, advanced oxidation, sand filtration, ultrafiltration, reverse osmosis and the like, in addition, concentrated water generated by the process is required to be oxidized, softened and concentrated, and finally, an evaporative crystallization process is adopted to form solid salt. The existing zero-emission treatment process has the defects of long flow, complex operation, poor stability, high energy and medicament consumption, large occupied area, high operation cost, difficult disposal of solid salt due to high organic matter content and the like, is difficult to stably operate for a long time, and has limited application range.
Disclosure of Invention
The invention aims to design a thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process comprises the following steps:
step (1), high-salinity high-organic wastewater to be treated with a certain temperature is subjected to filtering pretreatment, then is mixed with first effect humidifier circulating liquid preheated by a heat exchanger, then is conveyed to the first effect humidifier, and is dispersed by a distributor to be in countercurrent contact with air entering from the bottom of the first effect humidifier through a filler in the first effect humidifier; saturated hot humid air (relative humidity RH = 100%) discharged from the top of the first effect humidifier is pressurized and conveyed to a first effect dehumidifier through a fan (or a blower), and is cooled, dehumidified and returned to the first effect humidifier for recycling; condensed water generated by condensing the hot humid air in the first effect dehumidifier is conveyed to a battery limit zone through a pipeline;
conveying a second-effect humidifier circulating liquid into the first-effect dehumidifier through a pump to perform heat exchange with hot humid air, raising the temperature of the second-effect humidifier circulating liquid, and mixing the second-effect humidifier circulating liquid with concentrated high-salt high-organic wastewater discharged by the first-effect humidifier to enter the top of the second-effect humidifier;
step (3), the mixed liquid entering from the top of the second effect humidifier is dispersed by a distributor and is in countercurrent contact with the air entering from the bottom of the second effect humidifier through a filler inside the second effect humidifier, and saturated hot humid air (relative humidity RH = 100%) discharged from the top of the second effect humidifier enters a waste heat recovery device through pressurization of a fan (or a blower);
step (4), hot and humid air (relative humidity RH = 100%) discharged by the second effect humidifier is pressurized by a fan (or a blower) and enters a second effect dehumidifier in the waste heat recovery device for cooling and dehumidifying, and then is heated by an air heater in the waste heat recovery device and returns to the second effect humidifier for recycling; condensed water generated by condensing hot humid air in the second-effect dehumidifier is output to the outside through a pipeline, generated condensed heat enters heat pump cold water side circulating water in the waste heat recovery device through heat exchange, and the condensed heat in the heat pump cold water side circulating water is transferred to the heat pump hot water side circulating water through the heat pump;
on one hand, the heat required by the circulating liquid of the first-effect humidifier is heated and supplemented by the heat exchanger in the waste heat recovery device, on the other hand, the air at the outlet of the second-effect dehumidifier is heated by the air heater, and on the other hand, the redundant heat in the circulating water at the hot water side of the heat pump is discharged by the heat radiating component;
step (5), the high-salinity and high-organic wastewater discharged by the second-effect humidifier and subjected to temperature reduction and concentration is mixed with the circulating liquid of the third-effect humidifier and then is conveyed to the top of the third-effect humidifier, the mixed liquid is dispersed by a distributor and is in countercurrent contact with air entering from the bottom of the third-effect humidifier through a filler inside the third-effect humidifier, and hot and humid air discharged from the top of the third-effect humidifier is directly conveyed to the atmosphere;
and (6) the high-salinity high-organic-matter wastewater which is discharged by the third-effect humidifier and is close to a saturated state enters a crystallization tank, the temperature is reduced at room temperature, crystallized salt generated in the crystallization tank enters a desalting treatment process, and cooling liquid in the crystallization tank returns to the third-effect humidifier through a pump.
In the whole process, the high-salt and high-organic wastewater is circularly treated in an n-1 effect humidifying-dehumidifying unit consisting of an n-1 effect humidifier and an n-1 effect dehumidifier (n is more than or equal to 2); the number of the humidifiers is n (n is more than or equal to 2), and the number of the dehumidifiers is n-1 (n is more than or equal to 2).
The air enters and exits the humidifier and dehumidifier in a closed cycle manner.
When the air enters and exits the humidifier and the dehumidifier, an independent air opening mode can be selected, and the air in the boundary area directly enters the n-1 th effect humidifier through the fan and is discharged to the boundary area through the exhaust valve of the n-1 th effect dehumidifier.
The n-1-effect humidifying-dehumidifying unit for treating the high-salt high-organic wastewater can be one or the combination of a plurality of repeating units; wherein, the nth effect humidifier is an independent humidifying unit.
And hot and humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified and condensation heat is recovered through the waste heat recovery device.
The high-salinity high-organic-matter wastewater in the nth efficient humidifier enters from the top of the nth humidifier, is distributed on the surface of the filler through the distributor, and performs countercurrent mass and heat transfer with the air entering from the bottom of the nth humidifier.
And the air in the n-th effect humidifier and the liquid entering from the top are in countercurrent contact through plate corrugated packing (or net corrugated packing or grid packing).
Air enters from the bottom of the n-th effect humidifier by pressurization of a fan (or a blower).
The certain temperature of the high-salinity high-organic-matter wastewater to be treated is 20-100 ℃ or above.
The beneficial effects of the invention can be summarized as follows:
1. the invention provides a thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process, which realizes zero liquid discharge of high-salinity high-organic-matter wastewater.
2. The condensed water generated by condensing hot and humid air in the process can be used as water for the production process or water supplement of a circulating cooling process, and the recovery rate of the produced water can reach more than 80%.
3. The whole process only comprises three main parts, namely a humidifier, a dehumidifier and a waste heat recovery device, and has the advantages of simple flow, small occupied area, low equipment investment cost, simple and convenient operation and long-term stable operation.
4. The process does not need to cool the high-salt high-organic wastewater, utilizes the waste heat of raw water for treatment, is provided with a waste heat recovery device, and saves energy and reduces consumption.
5. No chemical agent is added during operation, no secondary pollution is caused, and the operation cost is low.
Drawings
FIG. 1 is a process flow diagram of the present invention.
The reference numbers are as follows:
1. first effect humidifier 2 and second effect humidifier
3. Third effect humidifier 4 and first effect dehumidifier
5. Second effect dehumidifier 6, heat pump
7. Heat exchanger 8 and heat radiating member
9. Air heater 10, filter equipment
11. Fan (or blower) 12, distributor
13. Pump 14 and crystallizing tank
21. High-salt high-organic matter wastewater 22 and condensed water
23. Boundary zone air 24, crystallized salt
61. A heat pump cold water side 62, a heat pump hot water side.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The process of the thermally-driven high-salinity high-organic wastewater 21 zero-emission treatment process shown in fig. 1 comprises the following steps:
step (1), high-salinity high-organic-matter wastewater 21 to be treated and with a certain temperature is subjected to filtering pretreatment, then is mixed with circulating liquid of a first effect humidifier 1 preheated by a heat exchanger 7, then is conveyed to the first effect humidifier 1, and is dispersed by a distributor 12 to be in countercurrent contact with air entering from the bottom of the first effect humidifier 1 through a filler in the first effect humidifier 1; saturated hot humid air (relative humidity RH = 100%) discharged from the top of the first effect humidifier 1 is pressurized by a fan (or blower) 11 and is conveyed to the first effect dehumidifier 4, and the saturated hot humid air is cooled, dehumidified and returned to the first effect humidifier 1 for recycling; condensed water 22 generated by condensing the hot humid air in the first effect dehumidifier 4 is conveyed to a battery limit zone through a pipeline;
step (2), the circulating liquid of the second effect humidifier 2 is conveyed by a pump 13 to enter the first effect dehumidifier 4 to exchange heat with hot humid air, the temperature of the circulating liquid of the second effect humidifier 2 is raised, and then the circulating liquid of the second effect humidifier 2 is mixed with concentrated high-salt and high-organic wastewater 21 discharged by the first effect humidifier 1 to enter the top of the second effect humidifier 2;
step (3), the mixed liquid entering from the top of the second effect humidifier 2 is dispersed by a distributor 12 and is in countercurrent contact with the air entering from the bottom of the second effect humidifier 2 through a filler inside the second effect humidifier 2, and the saturated hot humid air (relative humidity RH = 100%) discharged from the top of the second effect humidifier 2 is pressurized by a fan (or blower) 11 and enters a waste heat recovery device;
step (4), hot and humid air (relative humidity RH = 100%) discharged by the second effect humidifier 2 is pressurized by a fan (or blower) 11, enters the second effect dehumidifier 5 in the waste heat recovery device for cooling and dehumidifying, is heated by an air heater 9 in the waste heat recovery device, and returns to the second effect humidifier 2 for recycling; condensed water 22 generated by condensing hot humid air in the second-effect dehumidifier 5 is output to the outside through a pipeline, generated condensed heat enters heat pump cold water side 61 circulating water in the waste heat recovery device through heat exchange, and the condensed heat in the heat pump cold water side 61 circulating water is transferred to heat pump hot water side 62 circulating water through the heat pump 6;
the heat of condensation in the circulating water on the hot water side 62 of the heat pump is heated by the heat exchanger 7 in the waste heat recovery device to supplement the heat required by the circulating liquid of the first effect humidifier 1, the air at the outlet of the second effect dehumidifier 5 is heated by the air heater 9, and the surplus heat in the circulating water on the hot water side 62 of the heat pump is discharged by the heat radiating component 8;
step (5), the high-salinity high-organic-matter wastewater 21 after temperature reduction and concentration discharged from the second-effect humidifier 2 is mixed with the circulating liquid of the third-effect humidifier 3 and then is conveyed to the top of the third-effect humidifier 3, the mixed liquid is dispersed by a distributor 12 and is in countercurrent contact with air entering from the bottom of the third-effect humidifier 3 through a filler inside the third-effect humidifier 3, and hot and humid air discharged from the top of the third-effect humidifier 3 is directly conveyed to the atmosphere;
and (6) feeding the high-salinity high-organic-matter wastewater 21 which is nearly in a saturated state and is discharged by the third-effect humidifier 3 into a crystallization tank 14, cooling at room temperature, feeding crystallized salt 24 generated in the crystallization tank 14 into a desalting treatment process, and returning the cooling liquid in the crystallization tank 14 to the third-effect humidifier 3 through a pump 13.
In a more preferable embodiment, the high-salinity high-organic wastewater 21 is circularly treated in an n-1 effect humidifying-dehumidifying unit consisting of an n-1 effect humidifier and an n-1 effect dehumidifier (n is more than or equal to 2); the number of the humidifiers is n (n is more than or equal to 2), and the number of the dehumidifiers is n-1 (n is more than or equal to 2).
In a more preferred embodiment, the air enters and exits the humidifier and dehumidifier in a closed cycle.
In a more preferred embodiment, when the air enters and exits the humidifier and the dehumidifier, an independent air opening mode can be selected, and the boundary area air 23 directly enters the n-1 th effect humidifier through the fan and is discharged to the boundary area through the exhaust valve of the n-1 th effect dehumidifier.
In a more preferred embodiment, the n-1 effect humidification-dehumidification unit for treating the high-salinity high-organic wastewater 21 can be one or a combination of a plurality of repeating units; wherein, the nth effect humidifier is an independent humidifying unit.
In a more preferable embodiment, the hot humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified and the condensation heat is recovered through the waste heat recovery device.
In a more preferred embodiment, the high-salt high-organic wastewater 21 in the nth efficient humidifier enters from the top of the nth humidifier, is distributed on the surface of the packing through the distributor 12, and performs countercurrent mass and heat transfer with the air entering from the bottom of the nth humidifier.
In a more preferred embodiment, the air and the top entering liquid in the nth effect humidifier are in countercurrent contact through plate corrugated packing (or net corrugated packing or grid packing).
In a more preferred embodiment, air enters from the bottom of the n-th effect humidifier under pressure by a fan (or blower) 11.
In a more preferred embodiment, the high salinity high organic wastewater 21 to be treated has a temperature of 20 to 100 ℃ or more.
In particular embodiments, the present invention will be further described with reference to FIG. 1 for clarity.
The invention aims to fully utilize the waste heat of the high-salinity high-organic-matter wastewater 21 to form a heat-driven zero-emission treatment process. The whole process flow mainly comprises three equipment parts, namely a humidifier, a dehumidifier and a waste heat recovery device, and has the advantages of simple flow, convenience in operation, no addition of chemical agents, high mass transfer and heat recovery efficiency, low operation cost, small equipment investment, small occupied area, capability of stably operating for a long time and wide application range.
The humidifiers are classified into a first-effect humidifier and a second-effect humidifier … n-th-effect humidifier (n =1, 2, 3 …), the number of the humidifiers is determined according to the temperature of the owner wastewater, preferably n =1, 2, 3 are three humidifiers, and the humidifiers are also called as three-effect humidifiers.
The dehumidifier is divided into a first-effect dehumidifier and a second-effect dehumidifier … n-1-effect dehumidifier (n =2, 3 …), the number of the specific dehumidifiers is determined according to the number of the humidifiers, preferably n =2, 3 are two dehumidifiers, and the two dehumidifiers are also called as two-effect dehumidification.
In the process, the number of the humidifiers and the dehumidifier is not fixed, an n-effect humidifier and an n-1-effect dehumidifier (n =1, 2, 3 and 4 …) can be adopted, the n-1-effect humidifier and the n-1-effect dehumidifier form an n-1-effect humidifying-dehumidifying unit, air enters and exits the humidifier and the dehumidifier in a closed circulation mode, or in an open mode, air with a certain temperature in a boundary area directly enters the humidifier through a fan to be heated and humidified, then is cooled and dehumidified through the dehumidifier, and finally is discharged to the boundary area through a dehumidifier exhaust valve.
The waste heat recovery device is arranged at the position of the last effect hot humid air cooling, dehumidifying and condensation heat recovery of the heat-driven high-salinity high-organic-matter wastewater 21 zero-emission treatment system.
In the embodiment, triple-effect humidification and double-effect dehumidification are adopted, the humidifiers are a first-effect humidifier 1, a second-effect humidifier 2 and a third-effect humidifier 3 respectively, and the dehumidifiers are a first-effect dehumidifier 4 and a second-effect dehumidifier 5 respectively.
High-salt and high-organic-matter wastewater 21 to be treated and with a certain temperature is filtered and pretreated by a filtering device 10, then is mixed with circulating liquid of a first effect humidifier 1 preheated by a heat exchanger 7, and then is conveyed to the top of the first effect humidifier 1, is dispersed by a distributor 12 and is in countercurrent contact with air entering from the bottom of the first effect humidifier 1 through filler inside the first effect humidifier 1, so that the mass and heat transfer efficiency in the first effect humidifier 1 is improved, saturated hot humid air (relative humidity RH = 100%) discharged from the top of the first effect humidifier 1 is pressurized and conveyed to a first effect dehumidifier 4 by a fan (or a blower) 11, is cooled, dehumidified and then returns to the first effect humidifier 1 for recycling. The condensed water 22 produced by condensing the hot humid air in the first effect dehumidifier 4 is transported to the battery limits through a pipeline.
And circulating liquid of the second-effect humidifier 2 is conveyed by a pump 13 to enter the first-effect dehumidifier 4 to exchange heat with hot humid air, the temperature of the circulating liquid of the second-effect humidifier 2 is increased, and then the circulating liquid of the second-effect humidifier 2 is mixed with concentrated high-salt high-organic wastewater 21 discharged by the first-effect humidifier 1 to enter the top of the second-effect humidifier 2.
The mixed liquid entering from the top of the second-effect humidifier 2 is dispersed by the distributor 12 and is in countercurrent contact with the air entering from the bottom of the second-effect humidifier 2 through the filler inside the second-effect humidifier 2, so that the mass and heat transfer efficiency in the second-effect humidifier 2 is improved, and the saturated hot and humid air (relative humidity RH = 100%) discharged from the top of the second-effect humidifier 2 enters the waste heat recovery device through pressurization of the fan (or blower) 11.
The waste heat recovery device mainly comprises a second-effect dehumidifier 5, a heat pump 6, an air heater 9, a heat exchanger 7 and a heat dissipation component 8. Hot and humid air (relative humidity RH = 100%) discharged by the second effect humidifier 2 is pressurized by a fan (or blower) 11, enters the second effect dehumidifier 5 for cooling and dehumidifying, is heated by an air heater 9, and returns to the second effect humidifier 2 for recycling; the condensed water 22 generated by condensing the hot humid air in the second-effect dehumidifier 5 is output to the outside through a pipeline, the generated condensed heat enters the circulating water at the cold water side 61 of the heat pump through heat exchange, and the condensed heat in the circulating water at the cold water side 61 of the heat pump is transferred to the circulating water at the hot water side 62 of the heat pump through the heat pump 6. On one hand, the condensation heat in the circulating water of the hot water side 62 of the heat pump is heated by the heat exchanger 7 to supplement the heat required by the circulating liquid of the first effect humidifier 1; on one hand, the air at the outlet of the second effect dehumidifier 5 is heated by the air heater 9; on the other hand, the heat dissipation part 8 discharges the excessive heat in the circulating water at the hot water side 62 of the heat pump, so as to ensure the normal work of the heat pump 6 and maintain the stability of the waste heat recovery process.
The high salt and high organic matter wastewater 21 after the temperature reduction and concentration discharged from the second effect humidifier 2 is mixed with the circulating liquid of the third effect humidifier 3 and then is conveyed to the top of the third effect humidifier 3, the mixed liquid is dispersed by the distributor 12 and is in countercurrent contact with the air entering from the bottom of the third effect humidifier 3 through the filler inside the third effect humidifier 3, and the hot and humid air discharged from the top of the third effect humidifier 3 is directly conveyed to the atmosphere.
The nearly saturated high-salt and high-organic wastewater 21 discharged by the third effect humidifier 3 enters the crystallization tank 14, the temperature is reduced at room temperature, the crystallized salt 24 generated in the crystallization tank 14 enters the desalting treatment process, and the cooling liquid in the crystallization tank 14 is returned to the third effect humidifier 3 through the pump 6.
The heat pump 6 is a water source low-temperature heat pump, a water source medium-temperature heat pump or a water source high-temperature heat pump; the heat dissipation part 8 is an air-cooled water chiller or a water-cooled water chiller or other equipment or units capable of dissipating heat; the filler is plate ripple filler or net ripple filler or grid filler or other fillers beneficial to gas-liquid mass and heat transfer.
The present invention has been described in detail with reference to the specific and preferred embodiments, but it should be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and any modifications, equivalents and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. A thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process comprises the following steps:
step (1), high-salinity high-organic wastewater to be treated with a certain temperature is subjected to filtering pretreatment, then is mixed with first effect humidifier circulating liquid preheated by a heat exchanger, then is conveyed to the first effect humidifier, and is dispersed by a distributor to be in countercurrent contact with air entering from the bottom of the first effect humidifier through a filler in the first effect humidifier; saturated hot humid air discharged from the top of the first effect humidifier, with the relative humidity RH =100%, is pressurized by a fan or a blower and is conveyed to the first effect dehumidifier, and is cooled, dehumidified and returned to the first effect humidifier for recycling; condensed water generated by condensing the hot humid air in the first effect dehumidifier is conveyed to a battery limit zone through a pipeline;
conveying a second-effect humidifier circulating liquid into the first-effect dehumidifier through a pump to perform heat exchange with hot humid air, raising the temperature of the second-effect humidifier circulating liquid, and mixing the second-effect humidifier circulating liquid with concentrated high-salt high-organic wastewater discharged by the first-effect humidifier to enter the top of the second-effect humidifier;
step (3), the mixed liquid entering from the top of the second-effect humidifier is dispersed by a distributor and is in countercurrent contact with air entering from the bottom of the second-effect humidifier through a filler inside the second-effect humidifier, saturated hot and humid air discharged from the top of the second-effect humidifier, the relative humidity RH =100%, and the saturated hot and humid air enters a waste heat recovery device after being pressurized by a fan or a blower;
step (4), the waste heat recovery device comprises a second effect dehumidifier, an air heater, a heat pump and a heat exchanger, wherein the relative humidity RH =100% of the hot and humid air discharged by the second effect humidifier enters the second effect dehumidifier in the waste heat recovery device through the pressurization of a fan or a blower to be cooled and dehumidified, and then the hot and humid air is heated by the air heater in the waste heat recovery device and then returns to the second effect humidifier for recycling; condensed water generated by condensing hot humid air in the second-effect dehumidifier is output to the outside through a pipeline, generated condensed heat enters heat pump cold water side circulating water in the waste heat recovery device through heat exchange, and the condensed heat in the heat pump cold water side circulating water is transferred to the heat pump hot water side circulating water through the heat pump;
on one hand, the heat required by the circulating liquid of the first-effect humidifier is heated and supplemented by the heat exchanger in the waste heat recovery device, on the other hand, the air at the outlet of the second-effect dehumidifier is heated by the air heater, and on the other hand, the redundant heat in the circulating water at the hot water side of the heat pump is discharged by the heat radiating component;
step (5), the high-salinity and high-organic wastewater discharged by the second-effect humidifier and subjected to temperature reduction and concentration is mixed with circulating liquid of a third-effect humidifier and then is conveyed to the top of the third-effect humidifier, the mixed liquid is dispersed by a distributor and is in countercurrent contact with air entering from the bottom of the third-effect humidifier through fillers inside the third-effect humidifier, and hot and humid air discharged from the top of the third-effect humidifier is directly conveyed to the atmosphere;
and (6) the high-salinity high-organic-matter wastewater which is discharged by the third-effect humidifier and is close to a saturated state enters a crystallization tank, the temperature is reduced at room temperature, crystallized salt generated in the crystallization tank enters a desalting treatment process, and cooling liquid in the crystallization tank returns to the third-effect humidifier through a pump.
2. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 1, characterized in that: in the whole process, the high-salt and high-organic wastewater is circularly treated in an n-1 effect humidification-dehumidification unit consisting of an n-1 effect humidifier and an n-1 effect dehumidifier, wherein n is more than 2; the number of the humidifiers is n, n >2, and the number of the dehumidifiers is n-1, n > 2.
3. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: the air enters and exits the humidifier and dehumidifier in a closed cycle manner.
4. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 3, characterized in that: when the air enters and exits the humidifier and the dehumidifier, an independent air opening mode is selected, and the air in the boundary area directly enters the n-1 th effect humidifier through the fan and is discharged to the boundary area through the exhaust valve of the n-1 th effect dehumidifier.
5. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: the n-1 effect humidifying-dehumidifying unit for treating the high-salt high-organic wastewater is a combination of a plurality of repeating units; wherein, the nth effect humidifier is an independent humidifying unit.
6. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: and hot and humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified and condensation heat is recovered through the waste heat recovery device.
7. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: the high-salinity high-organic-matter wastewater in the nth efficient humidifier enters from the top of the nth efficient humidifier, is distributed on the surface of the filler through the distributor, and performs countercurrent mass and heat transfer with the air entering from the bottom of the nth efficient humidifier.
8. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: and the air in the nth effect humidifier and the liquid entering from the top are in countercurrent contact through plate corrugated packing or net corrugated packing or grid packing.
9. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 2, characterized in that: air enters from the bottom of the n-th effect humidifier by pressurization of a fan or a blower.
10. The thermally-driven high-salinity high-organic-matter wastewater zero-discharge treatment process according to claim 1, characterized in that: the certain temperature of the high-salinity high-organic-matter wastewater to be treated is 20-100 ℃ or above 100 ℃.
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