Integrated saline wastewater concentration and reduction system

Abstract

The embodiment of the application provides a kind of integrated salt-containing wastewater concentration reduction system, including high-temperature heat mass generation absorption integrated tower and low-temperature heat mass generation absorption integrated tower, in the application, the wastewater that can be same or different in high-temperature heat mass generation absorption integrated tower and low-temperature heat mass generation absorption integrated tower can be classified or graded treatment, while, water is heated by gas step by step, and different quality clean water can be obtained, which is beneficial to match sewage grade and the cascade utilization of clean water, to realize the cascade treatment of sewage.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification, and more specifically, to an integrated system for concentrating and reducing saline wastewater. Background Technology

[0002] Saline wastewater mainly originates from industries such as domestic water supply, food processing, metallurgy, chemicals, and oil and gas extraction, including wastewater generated during the production processes of enterprises such as printing and dyeing, refining, oil extraction, pharmaceuticals, and salt production. If high-salinity wastewater is directly discharged into water bodies, it will cause varying degrees of harm to aquatic organisms, domestic water use, and industrial and agricultural water use; therefore, it is necessary to purify saline wastewater.

[0003] Concentrating and reducing high-salt wastewater with high salt content is more difficult. In the field of high-salt wastewater purification, multi-effect evaporation or MVR is currently used for concentration and reduction, followed by evaporation crystallization or drying and solidification to achieve zero discharge. Water extracted by multi-effect evaporation or MVR can be reused in some processes, but conventional concentration and reduction processes currently have problems such as high energy consumption and poor water quality.

[0004] Therefore, this application is hereby submitted. Summary of the Invention

[0005] The objectives of this invention include, for example, providing an integrated saline wastewater concentration and reduction system that can classify and grade wastewater to obtain purified water of different qualities.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides an integrated system for concentrating and reducing saline wastewater, comprising a high-temperature heat and mass generation and absorption tower and a low-temperature heat and mass generation and absorption tower, wherein...

[0008] The high-temperature calorific mass generation and absorption integrated tower includes a first gas lifting device disposed in the middle of the tower body, which divides the high-temperature calorific mass generation and absorption integrated tower into a first upper tower and a first lower tower.

[0009] The first upper tower is provided with a first gas outlet at the top. The first upper tower is provided with a spray device, a high-temperature clean water circulation inlet and a high-temperature clean water circulation outlet in sequence from top to bottom. A high-temperature clean water circulation pipeline is provided between the high-temperature clean water circulation inlet and the high-temperature clean water circulation outlet.

[0010] The first lower-level tower is provided with a first gas inlet at the bottom. The first lower-level tower is provided with a high-temperature wastewater circulation outlet, a high-temperature wastewater circulation inlet and a spray device from bottom to top. A high-temperature wastewater circulation pipeline is provided between the high-temperature wastewater circulation inlet and the high-temperature wastewater circulation outlet. A high-temperature wastewater inlet is provided on the high-temperature wastewater circulation pipeline.

[0011] The integrated low-temperature calorific mass generation and absorption tower includes a second gas lifting device disposed in the middle of the tower body. The second gas lifting device divides the integrated low-temperature calorific mass generation and absorption tower into a second upper tower and a second lower tower.

[0012] The second upper tower is provided with a second gas outlet at the top. The second upper tower is provided with a spray device, a low-temperature sewage circulation inlet and a low-temperature sewage circulation outlet in sequence from top to bottom. A low-temperature sewage circulation pipeline is provided between the low-temperature sewage circulation inlet and the low-temperature sewage circulation outlet. A low-temperature sewage inlet is provided on the low-temperature sewage circulation pipeline.

[0013] The bottom of the second lower-level tower is provided with a second gas inlet. The second lower-level tower is provided with a low-temperature purified water circulation outlet, a low-temperature purified water circulation inlet and a spray device from bottom to top. A low-temperature purified water circulation pipeline is provided between the low-temperature purified water circulation outlet and the low-temperature purified water circulation inlet.

[0014] The first gas outlet and the second gas inlet are connected by a connecting pipe, and the second gas outlet and the first gas inlet are connected by a connecting pipe.

[0015] In an optional embodiment, the high-temperature purified water circulation pipeline passes sequentially through a high-temperature regenerating unit and a first cooling unit; the high-temperature purified water circulation pipeline is also equipped with a primary purified water tank and a circulation pump.

[0016] In an optional embodiment, a first preheating unit is also provided on the high-temperature purified water circulation pipeline, and a high-temperature sewage pipe is connected to the high-temperature sewage inlet, the high-temperature sewage pipe passing through the first preheating unit.

[0017] In an optional embodiment, the high-temperature sewage circulation pipeline is equipped with a circulation pump, the high-temperature regenerator unit, and a first heat pump unit capable of exchanging heat with the first cooling unit.

[0018] In an optional embodiment, the low-temperature wastewater circulation pipeline passes sequentially through a low-temperature regenerating unit and a second heat pump unit; the low-temperature wastewater circulation pipeline is also equipped with a wastewater tank and a circulation pump.

[0019] In an optional embodiment, a second preheating unit is also provided on the low-temperature purified water circulation pipeline, and a low-temperature sewage pipe is connected to the low-temperature sewage inlet, the low-temperature sewage pipe passing through the second preheating unit.

[0020] In an optional embodiment, the low-temperature purified water circulation pipeline is equipped with a circulation pump, the low-temperature regenerating unit, and a second cooling unit capable of exchanging heat with the second heat pump unit.

[0021] In an optional embodiment, a demister is provided above each of the spray devices.

[0022] In an optional embodiment, the temperature in the high-temperature heat mass generation and absorption integrated tower is higher than the temperature in the low-temperature heat mass generation and absorption integrated tower.

[0023] In an optional embodiment, when the ion content in the saline wastewater is less than 3000 mg / L, it enters the high-temperature wastewater circulation pipeline from the high-temperature wastewater inlet;

[0024] And / or, when the ion content in the saline wastewater is greater than 3000 mg / L, it enters the low-temperature wastewater circulation pipeline from the low-temperature wastewater inlet.

[0025] The beneficial effects of the embodiments of the present invention include, for example:

[0026] In this invention, the wastewater entering the high-temperature thermo-mass generation and absorption integrated tower and the low-temperature thermo-mass generation and absorption integrated tower can be the same or different, allowing for the classification or graded treatment of the wastewater. At the same time, by heating the water step by step with gas, purified water of different qualities can be obtained, which is beneficial for matching the wastewater grade and the tiered utilization of purified water, thus realizing the tiered treatment of wastewater. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the integrated saline wastewater concentration and reduction system of the present invention.

[0029] Icons: 100-High-temperature heat and mass generation and absorption integrated tower; 110-First gas lifting device; 120-First upper-stage tower; 121-First gas outlet; 122-Spray device; 123-Demister; 124-High-temperature purified water circulation pipeline; 125-High-temperature regenerator unit; 126-First cooling unit; 127-First-stage purified water tank; 128-Circulation pump; 129-First preheating unit; 130-First lower-stage tower; 131-First gas inlet; 132-High-temperature wastewater circulation pipeline; 133-High-temperature wastewater pipe; 134 - First heat pump unit; 200-Low-temperature heat and mass generation and absorption integrated tower; 210-Second gas lifting device; 220-Second upper tower; 221-Second gas outlet; 222-Low-temperature sewage circulation pipeline; 223-Low-temperature regenerator unit; 224-Second heat pump unit; 225-Low-temperature sewage pipe; 226-Sewage tank; 230-Second lower tower; 231-Second gas inlet; 232-Low-temperature purified water circulation pipeline; 233-Second preheating unit; 234-Second cooling unit; 300-Connecting pipe; 310-Fan. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0036] First Embodiment

[0037] Please refer to Figure 1 This embodiment provides an integrated saline wastewater concentration and reduction system, including a high-temperature heat and mass generation and absorption integrated tower 100 and a low-temperature heat and mass generation and absorption integrated tower 200, wherein...

[0038] The high-temperature heat and mass generation and absorption integrated tower 100 includes a first gas lifting device 110 disposed in the middle of the tower body. The first gas lifting device 110 divides the high-temperature heat and mass generation and absorption integrated tower 100 into a first upper tower 120 and a first lower tower 130.

[0039] The first upper tower 120 is provided with a first gas outlet 121 at the top. The first upper tower 120 is provided with a spray device 122, a high temperature clean water circulation inlet and a high temperature clean water circulation outlet in sequence from top to bottom. A high temperature clean water circulation pipeline 124 is provided between the high temperature clean water circulation inlet and the high temperature clean water circulation outlet.

[0040] The first lower tower 130 is provided with a first gas inlet 131 at the bottom. The first lower tower 130 is provided with a high-temperature sewage circulation outlet, a high-temperature sewage circulation inlet and a spray device 122 from bottom to top. A high-temperature sewage circulation pipeline 132 is provided between the high-temperature sewage circulation inlet and the high-temperature sewage circulation outlet. A high-temperature sewage inlet is provided on the high-temperature sewage circulation pipeline 132.

[0041] The integrated low-temperature heat mass generation and absorption tower 200 includes a second gas lifting device 210 disposed in the middle of the tower body. The second gas lifting device 210 divides the integrated low-temperature heat mass generation and absorption tower 200 into a second upper tower 220 and a second lower tower 230.

[0042] The second upper tower 220 is provided with a second gas outlet 221 at the top. The second upper tower 220 is provided with a spray device 122, a low-temperature sewage circulation inlet and a low-temperature sewage circulation outlet in sequence from top to bottom. A low-temperature sewage circulation pipeline 222 is provided between the low-temperature sewage circulation inlet and the low-temperature sewage circulation outlet. A low-temperature sewage inlet is provided on the low-temperature sewage circulation pipeline 222.

[0043] The second lower tower 230 is provided with a second gas inlet 231 at the bottom. The second lower tower 230 is provided with a low temperature purified water circulation outlet, a low temperature purified water circulation inlet and a spray device 122 from bottom to top. A low temperature purified water circulation pipeline 232 is provided between the low temperature purified water circulation outlet and the low temperature purified water circulation inlet.

[0044] The first gas outlet 121 and the second gas inlet 231 are connected by a connecting pipe 300, and the second gas outlet 221 and the first gas inlet 131 are connected by a connecting pipe 300.

[0045] In this embodiment of the invention, a high-temperature thermogravimetric generator-absorption integrated tower 100 and a low-temperature thermogravimetric generator-absorption integrated tower 200 are provided. The high temperature and low temperature are relative standards, that is, the temperature in the high-temperature thermogravimetric generator-absorption integrated tower 100 is higher than the temperature in the low-temperature thermogravimetric generator-absorption integrated tower 200. In some embodiments, the temperature in the high-temperature thermogravimetric generator-absorption integrated tower 100 can be 70-90°C, and the temperature in the low-temperature thermogravimetric generator-absorption integrated tower 200 can be 50-70°C.

[0046] In this embodiment of the invention, the high-temperature heat mass generation and absorption integrated tower 100 and the low-temperature heat mass generation and absorption integrated tower 200 are both two-stage integrated towers, each divided into upper and lower stages, with a gas lifting device in the middle, and spray devices 122 respectively installed in the upper and lower stages. Each spray device 122 is equipped with a demister 123 above it.

[0047] In this embodiment of the invention, low-temperature, low-humidity air first enters the second upper tower 220 of the low-temperature thermo-mass generation and absorption integrated tower 200, where it undergoes heat and mass transfer with low-temperature wastewater spray, initially heating the wastewater. Then, after passing through a high-efficiency demisting device, it enters the first lower tower 130 of the high-temperature thermo-mass generation and absorption integrated tower 100, where it undergoes heat and mass transfer with high-temperature wastewater spray, becoming high-temperature, high-humidity air. This high-temperature, high-humidity air then passes through a gas lifting device and enters the first upper tower 120 of the high-temperature thermo-mass generation and absorption integrated tower 100, where it undergoes heat and mass transfer with high-temperature purified water spray. Next, it leaves the high-temperature thermo-mass generation and absorption integrated tower 100 from the first gas outlet 121, and is then transported by a fan 310 through a connecting pipe 300 to the second lower tower 230 of the high-temperature thermo-mass generation and absorption integrated tower 100, where it undergoes heat and mass transfer with low-temperature purified water, becoming low-temperature, low-humidity air again. Finally, it enters the second upper tower 220 of the low-temperature thermo-mass generation and absorption integrated tower 200 via a copper drum gas lifting device, and this cycle continues. The gas lifting device is a device that allows gas to flow upwards and prevents liquid from flowing downwards.

[0048] It should be noted that the gas in this embodiment is not consumed, so it usually does not need to be replenished. If the gas is insufficient due to special circumstances, it can be replenished at any location.

[0049] In this embodiment of the invention, the wastewater entering the high-temperature thermo-mass generator-absorption integrated tower 100 and the low-temperature thermo-mass generator-absorption integrated tower 200 can be the same or different, allowing for wastewater classification or grading treatment. Simultaneously, by heating the water step by step with gas, different qualities of purified water can be obtained: when the influent water quality in the high-temperature thermo-mass generator-absorption integrated tower 100 and the low-temperature thermo-mass generator-absorption integrated tower 200 is the same, the purified water produced at the purified water outlet of the low-temperature thermo-mass generator-absorption integrated tower 200 has a higher quality than the purified water produced at the purified water outlet of the high-temperature thermo-mass generator-absorption integrated tower 100.

[0050] Second Embodiment

[0051] Based on the first embodiment, this embodiment further specifies that the high-temperature purified water circulation pipeline 124 passes through the high-temperature regenerating unit 125 and the first cooling unit 126 in sequence; the high-temperature purified water circulation pipeline 124 is also equipped with a primary purified water tank 127 and a circulation pump 128.

[0052] The high-temperature purified water circulation pipeline 124 is also equipped with a first preheating unit 129, and the high-temperature sewage inlet is connected to a high-temperature sewage pipe 133, which passes through the first preheating unit 129.

[0053] The high-temperature sewage circulation pipeline 132 is equipped with a circulation pump 128, a high-temperature regenerator unit 125, and a first heat pump unit 134 capable of exchanging heat with the first cooling unit 126.

[0054] After being preheated by the first preheating unit 129, the high-temperature wastewater is added to the high-temperature wastewater circulation system. After being heated by the high-temperature regenerating unit 125 and the first heat pump unit 134, it undergoes heat and mass transfer with air spray in the first lower tower 130 of the high-temperature heat and mass generation absorption integrated tower 100. The wastewater is concentrated in one step, and the purified water enters the air to obtain high-temperature and high-humidity gas. The high-temperature and high-humidity gas enters the first upper tower 120 through the gas lifting device. The concentrated wastewater can be discharged from the first lower tower 130 or enter the high-temperature wastewater circulation system.

[0055] After being cooled three times by the high-temperature regenerator 125, the first preheater 129, and the first cooling unit 126, the high-temperature purified water enters the first upper tower 120 of the high-temperature heat and mass generation and absorption integrated tower 100, where it is sprayed with high-temperature and high-humidity air for heat and mass transfer. The moisture in the air is condensed and precipitated into the primary water tank 127, from which the primary purified water is discharged.

[0056] Third Embodiment

[0057] Based on the first embodiment, this embodiment further specifies that the low-temperature sewage circulation pipeline 222 passes sequentially through the low-temperature regenerator unit 223 and the second heat pump unit 224; the low-temperature sewage circulation pipeline 222 is also equipped with a sewage tank 226 and a circulation pump 128.

[0058] A second preheating unit 233 is also installed on the low-temperature water purification circulation pipeline 232, and a low-temperature sewage pipe 225 is connected to the low-temperature sewage inlet, and the low-temperature sewage pipe 225 passes through the second preheating unit 233.

[0059] The low-temperature purified water circulation pipeline 232 is equipped with a circulation pump 128, the low-temperature regenerating unit 223, and a second cooling unit 234 capable of exchanging heat with the second heat pump unit 224.

[0060] After being preheated by low-temperature purified water in the second preheating unit 233, the low-temperature wastewater is added to the low-temperature wastewater circulation system. After being heated by the low-temperature regenerating unit 223 and the second heat pump unit 224, the wastewater is concentrated by heat and mass transfer with low-temperature and low-humidity air spray in the first upper tower 120 of the low-temperature heat and mass generation and absorption integrated tower 200. The purified water enters the air and leaves from the second gas outlet 221. It is transferred to the first lower tower 130 of the high-temperature heat and mass generation and absorption integrated tower 100 through the connecting pipe 300 under the action of the fan 310. The concentrated wastewater can be stored in a wastewater storage tank or discharged.

[0061] After being cooled three times by the low-temperature regenerator unit 223, the second preheater unit 233, and the second heat pump unit 224, the low-temperature purified water enters the second lower-stage tower 230 of the low-temperature heat and mass generation and absorption integrated tower 200, where it undergoes heat and mass transfer with the air spray. The moisture in the air is condensed and precipitated into the bottom of the tower, from which the secondary purified water is discharged or enters the low-temperature purified water circulation pipeline 232.

[0062] In this embodiment of the invention, steam, high-temperature flue gas, natural gas, electricity, or high-temperature hot water can be used as heat sources to drive the heat pump unit. The heat pump unit uses the driving energy to cool the purified water at the cold end, absorb its low-grade heat, and heat the sewage at the hot end to increase the sewage temperature.

[0063] In this embodiment of the invention, the system coordinates the regenerative heat exchanger and the preheating unit to further reduce energy consumption. The heat exchanger can be a high-efficiency corrosion-resistant plate heat exchanger, and the heat pump unit can be an absorption or compression heat pump.

[0064] When the system of this embodiment is running normally, the liquid levels of the first clean water tank, the sewage tank 226, the first lower tower 130, and the second lower tower 230 are stable within a reasonable range. When the sewage inflow is lower than the design operating conditions, the frequency of the blower 310 can be adjusted to control the sewage concentration ratio.

[0065] In some embodiments, when the ion content in the saline wastewater, such as the chloride ion content, is less than 3000 mg / L, it preferentially enters the high-temperature wastewater circulation pipeline 132 from the high-temperature wastewater inlet for concentration and purification. At this time, the pump and heat exchanger on the side of the low-temperature heat mass generation and absorption integrated tower 200 are shut down, but air passes through normally.

[0066] In some embodiments, when the ion content in the saline wastewater, such as the chloride ion content, is greater than 3000 mg / L, it preferentially enters the low-temperature wastewater circulation pipeline 222 from the low-temperature wastewater inlet for concentration and purification. At this time, the pump and heat exchanger on the side of the high-temperature heat and mass generation absorption tower 100 are shut down, but air passes through normally.

[0067] In some embodiments, when two streams of wastewater need to be treated simultaneously, wastewater with ion content, such as chloride ion content > 3000 mg / L, enters the low-temperature heat mass generation and absorption integrated tower 200 for concentration and purification; wastewater with ion content, such as chloride ion content < 3000 mg / L, enters the high-temperature heat mass generation and absorption integrated tower 100 for concentration and purification; at the same time, the blower 310 is adjusted to meet different wastewater purification needs.

[0068] Application Example 1

[0069] use Figure 1 The integrated saline wastewater concentration and reduction system treats wastewater containing no organic matter, with a total soluble salt content of 1 wt% and a chloride ion content of 2000 mg / L. The wastewater enters a high-temperature calorimetric absorption tower with a flow rate of 20 t / h and a temperature of 80°C.

[0070] Application Example 2

[0071] use Figure 1 The integrated saline wastewater concentration and reduction system treats wastewater that contains no organic matter, has a total soluble salt content of 3wt%, and a chloride ion content of 5000mg / L. The wastewater inlet has a flow rate of 10t / h and a temperature of 55℃.

[0072] Application Example 3

[0073] use Figure 1 The integrated saline wastewater concentration and reduction system treats wastewater containing no organic matter. The total soluble salt content in the low-temperature wastewater is 3 wt%, with chloride ions as the main component, at 5000 mg / L. The flow rate of the low-temperature wastewater inlet is 10 t / h, and the temperature is 55°C. The total soluble salt content in the high-temperature wastewater is 1 wt%, with chloride ions as the main component, at 2000 mg / L. The flow rate of the high-temperature wastewater inlet is 20 t / h, and the temperature is 80°C.

[0074] Comparative Application Example 4

[0075] The wastewater is treated using multi-effect flash evaporation, which can only treat one type of wastewater at a time. The wastewater contains no organic matter, has a total soluble salt content of 3%, a chloride ion content of 5000 mg / L, and a flow rate of 20 t / h at the wastewater inlet at a temperature of 80℃.

[0076] After entering the system, the wastewater first passes through a primary preheater to exchange heat with concentrated wastewater and then passes through a secondary preheater to exchange heat with the driving steam condensate and then enters the first-effect evaporator. After being heated by the driving steam, it generates some secondary steam. The steam-water mixture then enters the first-effect separator. After being depressurized, the wastewater continues to enter the second-effect evaporator, while the secondary steam from the first-effect evaporator serves as the driving steam for the second-effect evaporator, further evaporating the wastewater. The steam-water mixture then enters the second-effect separator again. The wastewater at the bottom of the second-effect separator is further depressurized and then goes to the third-effect evaporator. The secondary steam from the top of the second-effect separator serves as the driving steam for the third-effect evaporator, further evaporating the wastewater. The steam-water mixture then enters the third-effect separator. The concentrated wastewater at the bottom of the separator is discharged after passing through a concentrated water pump and a primary preheater, while the secondary steam from the third-effect separator enters the condenser and is condensed by cooling water.

[0077] The conventional pressure of the last effect of a triple-effect evaporator is around 7 kPa, and the condensation temperature is around 40°C. The condensation is released through a cooling tower.

[0078] The energy consumption of wastewater treatment and the total content of soluble salts in the purified water in the above embodiments and comparative examples were measured, and the results are shown in Table 1.

[0079] Table 1

[0080]

[0081]

[0082] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated salt-laden wastewater concentration reduction system, comprising: The high-temperature heat and mass generating absorption integrated tower and the low-temperature heat and mass generating absorption integrated tower, wherein, The high-temperature heat and mass generating absorption integrated tower comprises a first gas-lifting device arranged in the middle of the tower body, which separates the high-temperature heat and mass generating absorption integrated tower into a first upper tower and a first lower tower; The first upper tower is provided with a first gas outlet at the top, and is sequentially provided with a spraying device, a high-temperature clean water circulation inlet and a high-temperature clean water circulation outlet from top to bottom, and a high-temperature clean water circulation pipeline is arranged between the high-temperature clean water circulation inlet and the high-temperature clean water circulation outlet; The first lower tower is provided with a first gas inlet at the bottom, and is sequentially provided with a high-temperature sewage circulation outlet, a high-temperature sewage circulation inlet and a spraying device from bottom to top, and a high-temperature sewage circulation pipeline is arranged between the high-temperature sewage circulation inlet and the high-temperature sewage circulation outlet, and a high-temperature sewage inlet is arranged on the high-temperature sewage circulation pipeline; The low-temperature heat and mass generating absorption integrated tower comprises a second gas-lifting device arranged in the middle of the tower body, which separates the low-temperature heat and mass generating absorption integrated tower into a second upper tower and a second lower tower; The second upper tower is provided with a second gas outlet at the top, and is sequentially provided with a spraying device, a low-temperature sewage circulation inlet and a low-temperature sewage circulation outlet from top to bottom, and a low-temperature sewage circulation pipeline is arranged between the low-temperature sewage circulation inlet and the low-temperature sewage circulation outlet, and a low-temperature sewage inlet is arranged on the low-temperature sewage circulation pipeline; The second lower tower is provided with a second gas inlet at the bottom, and is sequentially provided with a low-temperature clean water circulation outlet, a low-temperature clean water circulation inlet and a spraying device from bottom to top, and a low-temperature clean water circulation pipeline is arranged between the low-temperature clean water circulation outlet and the low-temperature clean water circulation inlet; The first gas outlet and the second gas inlet are connected by a connecting pipe, and the second gas outlet and the first gas inlet are connected by a connecting pipe; The high-temperature clean water circulation pipeline sequentially passes through a high-temperature heat recovery unit and a first cooling unit, and a first clean water tank and a circulating pump are further arranged on the high-temperature clean water circulation pipeline; A first preheating unit is further arranged on the high-temperature clean water circulation pipeline, a high-temperature sewage pipe is connected to the high-temperature sewage inlet, and the high-temperature sewage pipe passes through the first preheating unit; A circulating pump, the high-temperature heat recovery unit and a first heat pump unit capable of heat exchange with the first cooling unit are arranged on the high-temperature sewage circulation pipeline; The low-temperature sewage circulation pipeline sequentially passes through a low-temperature heat recovery unit and a second heat pump unit, and a sewage tank and a circulating pump are further arranged on the low-temperature sewage circulation pipeline; A second preheating unit is further arranged on the low-temperature clean water circulation pipeline, a low-temperature sewage pipe is connected to the low-temperature sewage inlet, and the low-temperature sewage pipe passes through the second preheating unit; A circulating pump, the low-temperature heat recovery unit and a second cooling unit capable of heat exchange with the second heat pump unit are arranged on the low-temperature clean water circulation pipeline.

2. The integrated brine wastewater concentration reduction system of claim 1, wherein, A demister is arranged above each spraying device.

3. The integrated brine wastewater concentration reduction system of claim 1, wherein, The temperature in the high-temperature heat mass generation absorption integrated column is greater than the temperature in the low-temperature heat mass generation absorption integrated column.

4. The integrated brine wastewater concentration reduction system of claim 1, wherein, When the ion content in the salt-containing wastewater is less than 3000 mg / L, the high-temperature wastewater enters the high-temperature wastewater circulating pipeline from the high-temperature wastewater inlet; and / or, when the ion content in the salt-containing wastewater is greater than 3000 mg / L, the low-temperature wastewater enters the low-temperature wastewater circulating pipeline from the low-temperature wastewater inlet.

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