CN108675532B - Treatment process for realizing zero discharge of high-salt high-organic matter wastewater by utilizing waste heat - Google Patents

Treatment process for realizing zero discharge of high-salt high-organic matter wastewater by utilizing waste heat Download PDF

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Publication number
CN108675532B
CN108675532B CN201810473689.8A CN201810473689A CN108675532B CN 108675532 B CN108675532 B CN 108675532B CN 201810473689 A CN201810473689 A CN 201810473689A CN 108675532 B CN108675532 B CN 108675532B
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effect
humidifier
effect humidifier
salinity
heat
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CN108675532A (en
Inventor
王培功
曹海燕
张继超
曹普晅
曹真
尹胜奎
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Beijing Jindayu Environment Technology Co ltd
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Beijing Jindayu Environment Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/16Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/047Treatment of water, waste water, or sewage by heating by distillation or evaporation using eolic energy
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F2001/5218Crystallization
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The invention discloses a treatment process for realizing zero discharge of high-salinity high-organic matter wastewater by utilizing waste heat, 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 refrigeration equipment; hot humid air generated by the third-effect humidifier is directly discharged to the atmosphere, high-salt high-organic wastewater in a nearly saturated state generated at the bottom enters a crystallization tank, the temperature is reduced at room temperature, and 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

Treatment process for realizing zero discharge of high-salt high-organic matter wastewater by utilizing waste heat
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a treatment process for realizing zero discharge of high-salinity high-organic wastewater by utilizing waste heat.
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.
Meanwhile, in the actual production of the industries such as petrochemical industry, coal chemical industry, metallurgy and the like, waste flue gas generated after heating and burning of fuel is collected through a main flue and then continuously discharged to the atmosphere, the temperature of the waste flue gas can reach over 200 ℃, the flue gas is discharged into the air through the self-pulling force of a chimney, and if the waste heat is not recycled, precious energy is wasted, and the environment is polluted. In addition, the utilization of the waste heat of the waste steam in the production process of the factory or the waste heat gas generated in other processes is also an important way for improving the economy and saving the fuel. Therefore, measures are needed to be taken to recycle waste heat of waste flue gas, waste steam, waste heat and the like, and the waste heat is used for realizing the high-salt and high-organic-matter wastewater zero-emission process and process, so that the method has very important practical significance for effectively reducing the cost and promoting the realization of the sustainable development strategy.
Disclosure of Invention
The invention aims to design a treatment process for realizing zero discharge of high-salinity high-organic wastewater by utilizing waste heat, and solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a treatment process for realizing zero discharge of high-salinity high-organic matter wastewater by utilizing waste heat is characterized by comprising the following steps of:
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 first 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 and 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 refrigerating device through pressurization of a fan (or a blower);
step (4), the saturated hot 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 of the refrigeration device, the saturated hot humid air exchanges heat with cooling water of refrigeration equipment of the refrigeration device, the hot humid air enters the second heat exchanger for heating after being cooled and dehumidified, and then returns to the second-effect humidifier for recycling, and condensed water generated by condensation of the hot humid air in the second-effect dehumidifier is output to a boundary region through a pipeline;
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) allowing the high-salt and high-organic wastewater which is nearly saturated and is discharged by the third-effect humidifier to enter a crystallization tank, cooling at room temperature, allowing the crystallized salt generated in the crystallization tank to enter a desalting treatment process, and returning the cooling liquid in the crystallization tank to the third-effect humidifier through a pump.
The high-salt 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); wherein, 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).
And the air enters and exits the n-1 th effect humidification-dehumidification unit in a closed circulation mode.
The air can also select an independent air opening mode when entering and exiting the n-1 th effect humidification-dehumidification unit, 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 th effective humidification-dehumidification unit for treating the high-salt high-organic wastewater can be one or a combination of a plurality of repeating units; wherein, the nth effect humidifier is an independent humidifying unit.
And the hot humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified by the refrigerating 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.
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; air enters from the bottom of the n-th effect humidifier by pressurization of a fan (or a blower).
The circulating liquid of the first-effect humidifier exchanges heat with waste heat and waste gas of a factory through the first heat exchanger to obtain required heat, and the air at the outlet of the second-effect dehumidifier exchanges heat with the waste heat and waste gas of the factory through the second heat exchanger to obtain the required heat; the waste heat and waste gas is waste heat gas discharged by a factory or waste steam or waste heat gas generated in other processes.
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 treatment process and a treatment process for realizing zero discharge of high-salinity high-organic wastewater by utilizing waste heat, and realizes zero liquid discharge of the high-salinity high-organic 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 refrigerating device, and has the advantages of concise flow, saved occupied area, low equipment investment cost, simple and convenient operation and long-term stable operation.
4. No chemical agent is added during operation, no secondary pollution is caused, and the operation cost is low.
5. The process fully utilizes the waste heat of the waste water and the waste gas for treatment, saves energy, reduces consumption and has very important practical significance for realizing the strategy of sustainable development.
Drawings
FIG. 1 is a process flow diagram of the present invention.
The main element symbols 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, first heat exchanger
7. Second heat exchanger 8 and refrigeration equipment
9. Crystallization tank 10 and filtration device
11. Distributor 12, fan (or blower)
13. Pump 21, high-salt and high-organic wastewater
22. Waste gas 23 and condensed water of factory residual heat
24. Boundary zone air 25, crystallized salt.
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 treatment process for realizing zero discharge of the high-salinity high-organic wastewater 21 by using the waste heat shown in fig. 1 comprises the following steps:
step (1), high-salinity high-organic 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 first heat exchanger 6, then is conveyed to the first effect humidifier 1, and is dispersed by a distributor 11 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) 12 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 23 generated by condensing the hot humid air in the first effective dehumidifier 4 is conveyed to a battery limit zone through a pipeline;
step (2), a circulating liquid of a 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 11 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 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) 12 and enters a refrigeration device;
step (4), the saturated hot humid air (RH = 100%) discharged by the second-effect humidifier 2 is pressurized by a fan (or blower) 12 and enters the second-effect dehumidifier 5 of the refrigeration device, the saturated hot humid air exchanges heat with cooling water of a refrigeration device 8 of the refrigeration device, the hot humid air enters the second heat exchanger 7 for temperature rise after temperature reduction and dehumidification, and then returns to the second-effect humidifier 2 for recycling, and condensed water 23 generated by condensation of the hot humid air in the second-effect dehumidifier 5 is output to a boundary region through a pipeline;
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 11 and is in countercurrent contact with air entering from the bottom of the third-effect humidifier 3 through the 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) allowing the nearly saturated high-salinity high-organic-matter wastewater 21 discharged by the third effect humidifier 3 to enter a crystallization tank 9, cooling at room temperature, allowing crystallized salt 25 generated in the crystallization tank 9 to enter a desalting treatment process, and returning the cooling liquid in the crystallization tank 9 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); wherein, 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 (n-1) th effect humidification-dehumidification unit in a closed cycle manner.
In a more preferable implementation, the air can also be selected to be in an independent air opening mode when entering and exiting the n-1 th effect humidification-dehumidification unit, and the boundary zone air 24 directly enters the n-1 th effect humidifier through a fan and is discharged to the boundary zone through an exhaust valve of the n-1 th effect dehumidifier.
In a more preferred embodiment, the number of the n-1 th effective humidification-dehumidification units for treating the high-salinity high-organic wastewater 21 may be one, or may be a combination of a plurality of repeating units; wherein, the nth effect humidifier is an independent humidifying unit.
In a more preferred implementation, the hot humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified by the refrigeration device.
In a more preferable implementation, 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 11, and performs countercurrent mass and heat transfer with the air entering from the bottom of the nth humidifier.
In a more preferable implementation, the high-salinity 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 11, and performs countercurrent mass and heat transfer with the air entering from the bottom of the nth humidifier; air enters from the bottom of the n-th effect humidifier under the pressure increased by a fan (or blower) 12.
In a more preferable implementation, the circulating liquid of the first effect humidifier 1 exchanges heat with the waste plant heat exhaust gas 22 through the first heat exchanger 6 to obtain the required heat, and the air at the outlet of the second effect dehumidifier 5 exchanges heat with the waste plant heat exhaust gas 22 through the second heat exchanger 7 to obtain the required heat; the waste heat and waste gas is waste heat gas discharged by a factory or waste steam or waste heat gas generated in other processes.
In a more preferred embodiment, the high salinity and high organic content 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 and the factory waste gas 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 refrigerating device, and has the advantages of concise 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.
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, n humidifiers (n is more than or equal to 2) and n-1 dehumidifier (n is more than or equal to 2) can be adopted, the n-1-th effect humidifier and the n-1-th effect dehumidifier form an n-1-th effect humidifying-dehumidifying unit (n is more than or equal to 2), air enters and exits the humidifier and the dehumidifier in a closed circulation mode, or in an open mode, air 24 in a boundary area directly enters the n-1-th effect humidifier through a fan and then is discharged to the boundary area through an exhaust valve of the n-1-th effect dehumidifier.
The refrigerating device mainly comprises a dehumidifier (namely an n-1 effect dehumidifier) and a refrigerating device 8. Hot humid air (relative humidity RH = 100%) discharged from the n-1-th effect humidifier is pressurized by a fan (or a blower) 12, firstly enters the n-1-th effect dehumidifier to exchange heat with cooling water generated by a refrigeration device 8, enters a second heat exchanger 7 to be heated after temperature reduction and dehumidification, and then returns to the n-1-th effect humidifier to be recycled, and condensed water 23 generated by condensation of the hot humid air in the n-1-th effect dehumidifier is conveyed to a boundary region through a pipeline. The refrigerating device is arranged at the last effective hot humid air cooling and dehumidifying position of the high-salt high-organic wastewater 21 zero-discharge treatment process.
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.
The high-salinity high-organic-matter wastewater 21 to be treated and with a certain temperature is filtered and pretreated by the filter device 10, then is mixed with the circulating liquid of the first effect humidifier 1 preheated by the first heat exchanger 6, and then is conveyed to the top of the first effect humidifier 1 through a pipeline, is dispersed by the distributor 11 and is in countercurrent contact with air entering from the bottom of the first effect humidifier 1 in a filler inside the humidifier, 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 by a fan (or blower) 12 into the first effect dehumidifier 4. The hot and humid air is cooled and dehumidified by the first effect dehumidifier 4 and then returns to the first effect humidifier 1 through the fan (or blower) 12 for recycling; the condensed water 23 produced by condensing the hot humid air in the first effect dehumidifier 4 is transported to the battery limits through a line.
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 and humid air, heat in the hot and humid air is transferred to the circulating liquid of the second-effect humidifier 2, the heated circulating liquid of the second-effect humidifier 2 is mixed with concentrated high-salt and high-organic-matter wastewater 21 discharged by the first-effect humidifier 1 and is conveyed to the top of the second-effect humidifier 2 through a pipeline, a mixed liquid entering the top of the second-effect humidifier 2 is dispersed by a distributor 11 and is in countercurrent contact with air entering from the bottom of the second-effect humidifier 2 through a filler inside the second-effect humidifier 2, the mass transfer and heat transfer efficiency in the second-effect humidifier 2 is improved, and saturated hot and humid air (relative humidity RH = 100%) discharged from the top of the second-effect humidifier 2 is pressurized by a fan (or a blower) 12 and enters a refrigerating device.
The refrigerating device comprises a second-effect dehumidifier 5 and a refrigerating device 8, saturated hot humid air (relative humidity RH = 100%) discharged by the second-effect humidifier 2 enters the second-effect dehumidifier 5 through pressurization of a fan (or a blower) 12, the saturated hot humid air exchanges heat with cooling water of the refrigerating device 8, the hot humid air after temperature reduction and dehumidification is heated through a second heat exchanger 7 and then returns to the second-effect humidifier 2 for recycling, and condensed water 23 generated by condensation of the hot humid air in the second-effect dehumidifier 5 is output to a boundary area through a pipeline.
The high-salt and high-organic-matter wastewater 21 discharged by the second-effect humidifier 2 and subjected to temperature reduction and concentration 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 through a pipeline, the mixed liquid is dispersed by the distributor 11 and is in countercurrent contact with air entering from the bottom of the third-effect humidifier 3 through the filler inside the third-effect humidifier 3, the mass and heat transfer efficiency in the third-effect humidifier 3 is improved, and hot and humid air discharged from the top of the third-effect humidifier 3 is directly conveyed to the atmosphere.
The high-salt high-organic-matter wastewater 21 which is generated at the bottom of the third-effect humidifier 3 and is close to a saturated state is discharged into the crystallization tank 9, the temperature is reduced at room temperature, the generated crystallized salt 25 enters a desalting treatment process, and the generated cooling liquid returns to the third-effect humidifier 3 through the pump 13.
The circulating liquid of the first-effect humidifier 1, the air at the outlet of the second-effect dehumidifier 5 and the waste gas 22 after the waste heat of the factory are subjected to heat exchange through the first heat exchanger 6 and the second heat exchanger 7 respectively to obtain the heat required by the first-effect humidifier and the waste gas after the waste heat of the factory.
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 (8)

1. A treatment process for realizing zero discharge of high-salinity high-organic matter wastewater by utilizing waste heat is characterized by comprising the following steps of:
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 first 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 with the relative humidity RH =100% discharged from the top of the first effect humidifier is pressurized and conveyed to the 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 and 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 with relative humidity RH =100% discharged from the top of the second effect humidifier enters a refrigerating device after being pressurized by a fan or a blower;
step (4), saturated hot humid air with relative humidity RH =100% discharged by the second-effect humidifier is pressurized by a fan or a blower and enters a second-effect dehumidifier of the refrigerating device, the saturated hot humid air exchanges heat with cooling water of refrigerating equipment of the refrigerating device, the hot humid air enters a second heat exchanger for heating after being cooled and dehumidified, then the hot humid air returns to the second-effect humidifier for recycling, and condensed water generated by condensation of the hot humid air in the second-effect dehumidifier is output to a boundary region through a pipeline;
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;
step (6), the nearly saturated high-salt high-organic wastewater discharged by the third-effect humidifier enters a crystallization tank, the temperature is reduced at room temperature, the crystallized salt generated in the crystallization tank enters a desalting treatment process, and the cooling liquid in the crystallization tank returns to the third-effect humidifier through a pump;
the circulating liquid of the first-effect humidifier exchanges heat with waste heat and waste gas of a factory through the first heat exchanger to obtain required heat, and the air at the outlet of the second-effect dehumidifier exchanges heat with the waste heat and waste gas of the factory through the second heat exchanger to obtain the required heat; the waste heat and waste gas is waste heat gas discharged by a factory or waste steam or waste heat gas generated in other processes.
2. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 1, is characterized in that: 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; wherein, the number of the humidifiers is n, the number of the dehumidifiers is n-1, and n is more than or equal to 2.
3. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 2, is characterized in that: and the air enters and exits the n-1 th effect humidification-dehumidification unit in a closed circulation mode.
4. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 3, characterized in that: the air is selected to be in an independent air opening mode when entering and exiting the n-1 th effect humidification-dehumidification unit, 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 dehumidification unit.
5. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 2, is characterized in that: the n-1 th 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 treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 2, is characterized in that: and the hot humid air in the n-1 th effect dehumidifier of the n-1 th effect humidification-dehumidification unit is cooled and dehumidified by the refrigerating device.
7. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 2, is characterized in that: high-salt and high-organic wastewater in the nth-effect humidifier enters from the top of the nth-effect humidifier, is distributed on the surface of the filler through the distributor, and performs countercurrent mass and heat transfer with air entering from the bottom of the nth-effect humidifier.
8. The treatment process for realizing zero discharge of high-salinity high-organic wastewater by using waste heat according to claim 2, is characterized in that: high-salt and high-organic wastewater in the nth-effect humidifier enters from the top of the nth-effect humidifier, is distributed on the surface of the filler through the distributor, and performs countercurrent mass and heat transfer with air entering from the bottom of the nth-effect humidifier; air enters from the bottom of the n-th effect humidifier by pressurization of a fan or a blower.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101921036A (en) * 2010-06-30 2010-12-22 中国科学院电工研究所 Constant-pressure multiple-effect evaporation condensation sea water desalination device with air medium
CN107029446A (en) * 2017-03-02 2017-08-11 南京航空航天大学 Double caloics couple solution condensing crystallizing system and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101921036A (en) * 2010-06-30 2010-12-22 中国科学院电工研究所 Constant-pressure multiple-effect evaporation condensation sea water desalination device with air medium
CN107029446A (en) * 2017-03-02 2017-08-11 南京航空航天大学 Double caloics couple solution condensing crystallizing system and method

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