CN210505918U - High zero release processing system that contains salt waste water - Google Patents
High zero release processing system that contains salt waste water Download PDFInfo
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- CN210505918U CN210505918U CN201920939529.8U CN201920939529U CN210505918U CN 210505918 U CN210505918 U CN 210505918U CN 201920939529 U CN201920939529 U CN 201920939529U CN 210505918 U CN210505918 U CN 210505918U
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Abstract
The utility model discloses a high salt-containing wastewater zero-discharge treatment system, which comprises an air flotation unit, a double-membrane treatment unit, a high-pressure reverse osmosis unit, a concentrated water evaporation unit and a crystallization centrifugal unit which are arranged and communicated in sequence; air floatation wastewater of external high-salt-content wastewater treated by the air floatation unit enters the double-membrane treatment unit for filtration and purification, filtered water treated by the double-membrane treatment unit is delivered to an external tank area for recycling, concentrated water of the double-membrane treatment unit is further concentrated by the high-pressure reverse osmosis unit, and the high-concentration wastewater of the high-pressure reverse osmosis unit is evaporated and concentrated by the concentrated water evaporation unit and then is delivered to the crystallization centrifugal unit for crystallization and centrifugal treatment. The utility model discloses an integrated combination of multiple processing technology unit optimizes, makes the high concentration contain salt waste water treatment device modularization, and the zero release that realizes high salt waste water has the high salt waste water treatment effect preferred of solving, can not cause secondary pollution to the environment, advantage that the processing stability is good.
Description
Technical Field
The utility model relates to an industrial sewage treatment system, concretely relates to high salt waste water zero release processing system that contains.
Background
The industrial high-salt-content wastewater refers to industrial wastewater with TDS (total dissolved solids) mass fraction of more than or equal to 3.5%, and usually contains Cl < - >, SO4 2-，Na+，Ca2+And (3) the soluble inorganic salt ions and part of organic components (if the total salt mass fraction is more than or equal to 1 percent based on NaCl). At present, industrial high-salt-content wastewater is mainly concentrated in coal chemical production processes, including novel coal chemical projects such as coal-to-olefin, coal-to-ethylene glycol, coal-to-natural gas and coal-to-dimethyl ether. The high-salt-content wastewater has the characteristics of high salt concentration, complex components, more organic components and difficult degradation, and the conventional physical and chemical methods and biochemical methods have difficulty in obtaining ideal treatment effects and have high energy consumption. If directly or dilute outward, caused water waste on the one hand, on the other hand can cause adverse effect to the environment. The membrane desalination technology mainly based on reverse osmosis has the water recovery rate of only 75%, and also has the problems of 25% discharge of concentrated solution with higher salt content and serious membrane fouling. At present, the MVR evaporation crystallization technology can effectively avoid the pollution to the external environment caused by direct discharge, but the operation energy consumption is high, and the electricity consumption of 50 kW.h is required for treating each ton of water. Therefore, there is a need to develop a low energy consumption and high efficiency treatment technology to realize the economic and high efficiency treatment of wastewater with high salt content. With the national supervision and accountability mechanism for wastewater treatment and water resource utilization, the simple standard-reaching discharge can not meet the current resource utilization and ecological protection standards, and the high efficiency, saving and zero discharge become the current industrial water trend.
Disclosure of Invention
The purpose of the invention is as follows: the utility model aims to solve the technical problem of prior art not enough, provide a high salt waste water zero release processing system that contains, through the integration of multiple processing technology unit, improve the concentrated water concentration multiple of high salt, reduce the evaporation crystallization and handle the concentrated water yield to final strong brine evaporation treatment, realize the zero release of high salt waste water, can solve prior art well salt waste water treatment effect not good, easily cause secondary pollution to the environment, the operation energy consumption is high and the high problem of input cost.
The technical scheme is as follows: the utility model relates to a high salt waste water zero release processing system, which comprises an air flotation unit, a double-membrane processing unit, a high-pressure reverse osmosis unit, a concentrated water evaporation unit and a crystallization centrifugal unit which are arranged and communicated in sequence; air floatation wastewater of external high-salt-content wastewater treated by the air floatation unit enters the double-membrane treatment unit for filtration and purification, filtered water treated by the double-membrane treatment unit is delivered to an external tank area for recycling, concentrated water of the double-membrane treatment unit is further concentrated by the high-pressure reverse osmosis unit, and the high-concentration wastewater of the high-pressure reverse osmosis unit is evaporated and concentrated by the concentrated water evaporation unit and then is delivered to the crystallization centrifugal unit for crystallization and centrifugal treatment.
Preferably, the air flotation unit comprises a wastewater adjusting tank, an air flotation tank, a sludge clarifying tank, an air saturation tank and an air flotation circulating pump; the outlet of the wastewater adjusting tank is communicated with the inlet of the air flotation tank, the bottom of the air flotation tank is provided with a sludge outlet, the sludge outlet of the air flotation tank is communicated with the inlet of the sludge clarifying tank, the bottom of the sludge clarifying tank is provided with a sludge removing port, the side surface of the sludge clarifying tank is provided with an outlet, and the side surface outlet of the sludge clarifying tank is communicated with the wastewater adjusting tank; an air floatation wastewater outlet is formed in the side face of the air floatation tank and is respectively communicated with the double-membrane treatment unit and the air floatation circulating pump, the outlet of the air floatation circulating pump is communicated with the air saturation tank, and the side face outlet of the air saturation tank is communicated with the inlet of the air floatation tank;
the external salt-containing wastewater enters an air floatation tank after being regulated by a wastewater regulating tank, part of the air floatation wastewater treated by the air floatation tank enters a double-membrane treatment unit, and part of the air floatation wastewater is sent into an air saturation tank through an air floatation circulating pump in a form of return water to form saturated dissolved air water and then is circulated back to the air floatation tank; the bottom of the air flotation tank is connected with a sludge clarification tank and is used for periodically collecting sludge discharged from the bottom of the air flotation tank and floating oil on the top of the air flotation tank; supernatant of the sludge clarifying tank returns to the wastewater adjusting tank, and sludge at the lower part is delivered to an external sludge treatment system; the air saturation tank is connected with an external compressed air pipe, so that compressed air enters the air saturation tank to form saturated dissolved air water.
Preferably, the pressure of the external compressed air pipe is 0.4-0.8 Mpa, and the external saline wastewater contains suspended matters thereofThe content is 500-8000 mg/L; the single operation capacity of the air-bearing tank is 1m3/h~6000m3H; the mass fraction of the return water flow of the air flotation tank in the total amount of the air flotation wastewater is 15-60%.
Preferably, the double-membrane treatment unit comprises a microfiltration prefilter, a microfiltration filtration system, a reverse osmosis prefilter, a reverse osmosis feed booster pump and a reverse osmosis filtration system which are connected in sequence, wherein the microfiltration prefilter is connected with the air flotation tank;
filtering and removing impurities from the air flotation wastewater treated by the air flotation unit through a microfiltration prefilter, a microfiltration filtration system and a reverse osmosis prefilter to remove fine suspended matters, bacteria and silicon, pressurizing the air flotation wastewater by a reverse osmosis feed booster pump, then feeding the pressurized air flotation wastewater into a reverse osmosis filtration system to filter and concentrate the salt-containing wastewater, feeding the filtered water into an external tank area for recycling, and further concentrating the concentrated water in a high-pressure reverse osmosis unit; the microfiltration prefilter is used for removing solids with the particle size of more than 400 micrometers, and the microfiltration filtration system can be backwashed automatically or backwashed manually; the microfiltration and filtration system comprises a hollow fiber membrane in a membrane module mode, the pressure of the filtration system is 60 kPa (G) -500 kPa (G), the water recovery rate is more than 90%, and the effluent SDI is less than or equal to 3.
Preferably, the reverse osmosis prefilter is a 5 μm cartridge; the reverse osmosis filtration system comprises one-stage reverse osmosis or multi-stage reverse osmosis; the membrane module type adopts a roll membrane, and the filtration pressure is 1.5-7 Mpa (G); the water recovery rate is not lower than 75 percent; the TDS of the concentrated water is not less than 15000 mg/L.
Preferably, the high-pressure reverse osmosis unit comprises a reverse osmosis high-pressure pump, a high-pressure reverse osmosis filtration system and a concentrated water tank which are connected in sequence, and the reverse osmosis high-pressure pump is connected with the reverse osmosis filtration system;
the concentrated water of the double-membrane treatment unit enters a high-pressure reverse osmosis filtration system for further concentration after being pressurized by a reverse osmosis high-pressure pump; the concentrated high-concentration wastewater enters a concentrated water tank and then is sent to the next unit for treatment, and the filtered water is sent to a tank area for reuse; the high-pressure reverse osmosis filtration system comprises a first-stage high-pressure filtration or a multi-stage high-pressure filtration, and the working pressure is 8-12 Mpa; the high-pressure reverse osmosis filtration system comprises a butterfly tube type high-pressure membrane.
Preferably, the concentrated water evaporation unit comprises a concentrated water feeding heat exchanger, a deaerator, a brine evaporator, a steam condensate tank, a condensate pump, an evaporation circulating pump, a salt seed circulator, a high-salinity waste liquid tank and an air cooler;
the concentrated water feeding heat exchanger is connected with a concentrated water tank, an outlet of the concentrated water feeding heat exchanger is connected with an inlet of a deaerator, an outlet of the deaerator is connected with a brine evaporator, a bottom discharge port of the brine evaporator is connected with an inlet of an evaporation circulating pump, an outlet of the evaporation circulating pump is connected with an inlet at the top of the brine evaporator, two branches are arranged on a communication line of the evaporation circulating pump and the brine evaporator and are respectively connected with a salt seed circulator and a high-salt waste liquid tank, a top outlet of the salt seed circulator is connected with the high-salt waste liquid tank, a bottom outlet is connected with a communication line of the evaporation circulating pump and the brine evaporator, a strong brine steam outlet at the side of the brine evaporator is connected with an inlet of an air cooler, and an outlet of the air cooler is connected; a heating steam condensate outlet on the bottom side surface of the brine evaporator is connected with a steam condensate tank, and the steam condensate tank is respectively connected with a condensate pump and an inlet on the top of the brine evaporator;
feeding high-concentration wastewater from a high-concentration water tank into a feeding heat exchanger, primarily heating the wastewater to a temperature close to boiling temperature, and then feeding the wastewater into a deaerator, wherein the deaerator adopts steam stripping to remove carbon dioxide and other volatile matters; the material water after being regulated, heated and deoxidized enters a saline water evaporator for heating and evaporation, the saline water slurry after evaporation and concentration enters the bottom of the saline water evaporator, the saline water slurry continuously circulates to the top of the saline water evaporator through an evaporation circulating pump and is vertical to a heat exchange pipe for circulating evaporation and concentration, and part of the saline water slurry is extracted and enters a high-salinity waste liquid tank; salt seeds are mixed with circulating brine through the discharge at the bottom of the salt seed circulator, and clear water at the top of the salt seed circulator enters a high-salinity waste liquid tank; the circulating brine contains enough salt seeds for preventing scaling, the salt seeds circulator keeps the salt seeds with proper concentration in the brine, and the brine is concentrated under the condition that the heat transfer surface of the brine evaporator is not scaled; the water vapor evaporated by the strong brine in the brine evaporator is cooled by an air cooler and then enters a strong brine feeding heat exchanger to heat strong brine from the strong brine tank; heating steam in the brine evaporator exchanges heat with concentrated water and then enters a steam condensate tank, condensate is sent out through a condensate pump, and the steam is circulated back to the brine evaporator and mixed with external steam and then enters the brine evaporator to continuously evaporate the concentrated water in the brine evaporator.
Preferably, the brine evaporator is a falling film evaporator, and the heating mode comprises one or two of external steam supply heating and steam compression recycling.
Preferably, after the high-concentration brine extracted from the high-salinity waste liquid tank is crystallized and centrifuged by the crystallization and centrifugation unit, the crystallized salt is sent to the outside for treatment, and the mother liquid returns to the concentrated water evaporation unit for circular treatment.
Has the advantages that: (1) the utility model optimizes the integration combination of the air flotation unit, the double-membrane treatment unit, the high-pressure reverse osmosis unit, the concentrated water evaporation unit and the crystallization centrifugal unit, so that the high-concentration salt-containing wastewater treatment equipment is modularized and simplified, zero discharge of high-salt wastewater is realized, and compared with the prior art, the utility model has the advantages of excellent treatment of high-salt wastewater, difficult secondary pollution to the environment and good treatment stability;
(2) the utility model can improve the concentration multiple of the salt-containing concentrated water through multi-stage high-low pressure membrane concentration in the double-membrane treatment unit, reduce the concentrated water amount of evaporative crystallization treatment, and has the characteristics of low energy consumption and high treatment efficiency;
(3) the utility model discloses with the coupling of embrane methods such as air supporting, two membrane treatments, high pressure reverse osmosis and combine together with MVR salt solution evaporation, centrifugal crystallization technique, carry out branch matter deep treatment to various waste waters, through the step utilization of water resource, overcome the shortcoming of single technique, get the strong point and offset the weak point, exert the combination advantage better, can be high-efficient economical handle and retrieve the waste water that contains salt highly, have apparent economic benefits and social;
(4) in the practical application process of the utility model, the system can recover more than 90 percent of water in the strong brine, and has high reliability; the system allows the quality of the inlet water to have certain load fluctuation and has strong adaptability to sewage.
Drawings
FIG. 1 is a process flow diagram of the high salt-containing wastewater zero-discharge treatment system of the utility model.
In the figure, 1-air flotation unit, 2-double membrane treatment unit, 3-high pressure reverse osmosis unit, 4-concentrated water evaporation unit, 5-crystallization centrifugal unit, 101-wastewater regulation tank, 102-air flotation tank, 103-sludge clarification tank, 104-air saturation tank, 105-air flotation circulating pump, 201-microfiltration prefilter, 202-microfiltration filtration system, 203-reverse osmosis prefilter, 204-reverse osmosis feed booster pump, 205-reverse osmosis filtration system, 301-reverse osmosis high pressure pump, 302-high pressure reverse osmosis filtration system, 303-concentrated water tank, 401-concentrated water feed heat exchanger, 402-deaerator, 403-saline water evaporator, 404-vapor condensate tank, 405-condensate pump, 406-evaporation circulating pump, 407-saline seed circulator, 408-high salt waste liquid tank, 409-air cooler.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example (b): a high-salt-content wastewater zero-emission treatment system comprises an air floatation unit 1, a double-membrane treatment unit 2, a high-pressure reverse osmosis unit 3, a concentrated water evaporation unit 4 and a crystallization centrifugal unit 5 which are sequentially arranged and communicated; air floatation wastewater of external high-salt-content wastewater treated by the air floatation unit 1 enters the double-membrane treatment unit 2 for filtration and purification, filtered water treated by the double-membrane treatment unit 2 is sent to an external tank area for reuse, concentrated water of the double-membrane treatment unit is further concentrated by the high-pressure reverse osmosis unit 3, and high-concentration wastewater of the high-pressure reverse osmosis unit 3 is evaporated and concentrated by the concentrated water evaporation unit 4 and then sent to the crystallization centrifugal unit 5 for crystallization and centrifugal treatment.
The air flotation unit 1 comprises a wastewater adjusting tank 101, an air flotation tank 102, a sludge clarifying tank 103, an air saturation tank 104 and an air flotation circulating pump 105; the outlet of the wastewater adjusting tank 101 is communicated with the inlet of the air flotation tank 102, the bottom of the air flotation tank 102 is provided with a sludge outlet, the sludge outlet of the air flotation tank 102 is communicated with the inlet of the sludge clarifying tank 103, the bottom of the sludge clarifying tank 103 is provided with a sludge removing port, the side surface of the sludge clarifying tank is provided with an outlet, and the side surface outlet of the sludge clarifying tank 103 is communicated with the wastewater adjusting tank 101; an air flotation wastewater outlet is formed in the side surface of the air flotation tank 102 and is respectively communicated with the double-membrane treatment unit 2 and an air flotation circulating pump 105, the outlet of the air flotation circulating pump 105 is communicated with an air saturation tank 104, and the outlet in the side surface of the air saturation tank 104 is communicated with the inlet of the air flotation tank 102;
the double-membrane treatment unit 2 comprises a microfiltration prefilter 201, a microfiltration filtration system 202, a reverse osmosis prefilter 203, a reverse osmosis feed booster pump 204 and a reverse osmosis filtration system 205 which are connected in sequence, wherein the microfiltration prefilter 201 is connected with the air flotation tank 102;
the high-pressure reverse osmosis unit 3 comprises a reverse osmosis high-pressure pump 301, a high-pressure reverse osmosis filtration system 302 and a concentrated water tank 303 which are connected in sequence, wherein the reverse osmosis high-pressure pump 301 is connected with the reverse osmosis filtration system 205;
the concentrated water evaporation unit 4 comprises a concentrated water feeding heat exchanger 401, a deaerator 402, a brine evaporator 403, a steam condensate tank 404, a condensate pump 405, an evaporation circulating pump 406, a salt seed circulator 407, a high-salinity waste liquid tank 408 and an air cooler 409; the concentrated water feeding heat exchanger 401 is connected with the concentrated water tank 303, the outlet of the concentrated water feeding heat exchanger 401 is connected with the inlet of a deaerator 402, the outlet of the deaerator 402 is connected with a saline water evaporator 403, the bottom discharge port of the saline water evaporator 403 is connected with the inlet of an evaporation circulating pump 406, the outlet of the evaporation circulating pump 406 is connected with the inlet of the top of the saline water evaporator 403, two branches are arranged on a communication line of the evaporation circulating pump 406 and the saline water evaporator 403 and are respectively connected with a salt seed circulator 407 and a high-salt waste liquid tank 408, the top outlet of the salt seed circulator 407 is connected with the high-salt waste liquid tank 408, the bottom outlet is connected with a communication line of the evaporation circulating pump 406 and the saline water evaporator 403, the side concentrated saline water vapor outlet of the saline water evaporator is connected with the inlet of an air cooler; the bottom side of the brine evaporator 403 is connected with a steam condensate tank 404 through a heating steam condensate outlet, and the steam condensate tank 404 is respectively connected with a condensate pump 405 and a top inlet of the brine evaporator 403.
The utility model discloses a theory of operation does:
the outside salt-containing wastewater enters an air floatation tank 102 after being regulated by a wastewater regulating tank 101, part of the air floatation wastewater treated by the air floatation tank 102 enters a double-membrane treatment unit 2, and part of the air floatation wastewater passes through a return water formAn air flotation circulating pump 105 is sent into the air saturation tank 104 to form saturated dissolved air water, and then the saturated dissolved air water is circulated back to the air flotation tank 102; the bottom of the air flotation tank 102 is connected with a sludge clarification tank 103 which is used for periodically collecting sludge discharged from the bottom of the air flotation tank 102 and floating oil on the top; the supernatant of the sludge clarifying tank 103 returns to the wastewater adjusting tank 101, and the sludge at the lower part is sent to an outside sludge treatment system; the air saturation tank 104 is connected with an external compressed air pipe, so that compressed air enters the air saturation tank 104 to form saturated dissolved air water; the pressure of the external compressed air pipe is 0.4-0.8 Mpa, and the content of suspended matters in the external salt-containing wastewater is 500-8000 mg/L; the single operation capacity of the air-floating tank 102 is 1m3/h~6000m3H; the mass fraction of the return water of the air flotation tank 102 in the total amount of the air flotation wastewater is 15-60%;
the air flotation wastewater treated by the air flotation unit 1 is filtered and decontaminated by a microfiltration prefilter 201, a microfiltration filtration system 202 and a reverse osmosis prefilter 203 to remove fine suspended matters, bacteria and silicon, and then enters a reverse osmosis filtration system 205 to filter and concentrate the salt-containing wastewater after being pressurized by a reverse osmosis feeding booster pump 204, the filtered water is sent to an external tank area for reuse, and the concentrated water is further concentrated by a high-pressure reverse osmosis unit 3; the microfiltration prefilter 201 is used for removing solids with the particle size of more than 400 microns, and the microfiltration system 202 can be backwashed automatically or manually; the microfiltration and filtration system 202 has membrane module types including but not limited to hollow fiber membranes, the pressure of the filtration system is 60 kPa (G) -500 kPa (G), the water recovery rate is more than 90%, and the effluent SDI is less than or equal to 3; the reverse osmosis pre-filter 203 is preferably a 5 μm filter element; the reverse osmosis filtration system 205 comprises one or more stages of reverse osmosis; the membrane module type adopts a roll membrane, and the filtration pressure is 1.5-7 Mpa (G); the water recovery rate is not lower than 75 percent; TDS of the concentrated water is not less than 15000 mg/L; the concentrated water of the double-membrane processing unit 2 enters a high-pressure reverse osmosis filtering system 302 for further concentration after being pressurized by a reverse osmosis high-pressure pump 301; the concentrated high-concentration wastewater enters a concentrated water tank 303 and then is sent to the next unit for treatment, and the filtered water is sent to a tank area for reuse; the high-pressure reverse osmosis filtration system 302 comprises one-stage high-pressure filtration or multi-stage high-pressure filtration, and the working pressure is 8-12 Mpa; the high pressure reverse osmosis filtration system 302 may be in the form of a membrane module including, but not limited to, a butterfly tube type high pressure membrane;
the high-concentration wastewater from the concentrated water tank 303 enters a feed heat exchanger, is primarily heated to a temperature close to boiling temperature and then is sent to a deaerator 402, and the deaerator 402 is stripped by steam to remove carbon dioxide and other volatile matters; the material water after adjustment, heating and deoxidization enters a saline water evaporator 403 for heating and evaporation, the saline water slurry after evaporation and concentration enters the bottom of the saline water evaporator 403, the material water is continuously circulated to a vertical heat exchange tube at the top of the saline water evaporator 403 through an evaporation circulating pump 406 for circulating evaporation and concentration, and part of the saline water slurry is extracted and enters a high-salinity waste liquid tank 408; salt seeds are mixed with circulating brine through the discharge at the bottom of the salt seed circulator 407, and clear water at the top of the salt seed circulator 407 enters a high-salinity waste liquid tank 408; the circulating brine contains enough salt seeds for preventing scaling, the salt seeds in the brine are maintained at proper concentration by the salt seed circulator 407, and the brine is concentrated under the condition that the heat transfer surface of the brine evaporator 403 is not scaled; the recovery rate of water in the concentrated water evaporation unit 4 is not lower than 90%, and water vapor evaporated by concentrated brine in the brine evaporator 403 enters the concentrated water feeding heat exchanger 401 after being cooled by the air cooler 409 so as to heat concentrated water from the concentrated water tank 303; heating steam in the brine evaporator 403 enters a steam condensate tank 404 after exchanging heat with concentrated water, condensate is sent out through a condensate pump 405, the steam is circulated back to the brine evaporator 403 and is mixed with external steam to enter the brine evaporator 403 to continuously evaporate the concentrated water in the brine evaporator 403; the brine evaporator 403 is a falling film evaporator, and the heating mode comprises one or two combination of external steam supply heating and steam compression recycling;
after the high-concentration brine extracted from the high-salinity waste liquid tank 408 is crystallized and centrifuged by the crystallization and centrifugation unit 5, the crystallized salt is sent to the outside for treatment, and the mother liquid returns to the concentrated water evaporation unit 4 for circular treatment.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The high-salt-content wastewater zero-emission treatment system is characterized by comprising an air floatation unit, a double-membrane treatment unit, a high-pressure reverse osmosis unit, a concentrated water evaporation unit and a crystallization centrifugal unit which are sequentially arranged and communicated; air floatation wastewater of external high-salt-content wastewater treated by the air floatation unit enters the double-membrane treatment unit for filtration and purification, filtered water treated by the double-membrane treatment unit is delivered to an external tank area for recycling, concentrated water of the double-membrane treatment unit is further concentrated by the high-pressure reverse osmosis unit, and the high-concentration wastewater of the high-pressure reverse osmosis unit is evaporated and concentrated by the concentrated water evaporation unit and then is delivered to the crystallization centrifugal unit for crystallization and centrifugal treatment.
2. The zero discharge treatment system for wastewater with high salinity according to claim 1, characterized in that the air flotation unit comprises a wastewater conditioning tank, an air flotation tank, a sludge clarification tank, an air saturation tank and an air flotation circulating pump; the outlet of the wastewater adjusting tank is communicated with the inlet of the air flotation tank, the bottom of the air flotation tank is provided with a sludge outlet, the sludge outlet of the air flotation tank is communicated with the inlet of the sludge clarifying tank, the bottom of the sludge clarifying tank is provided with a sludge removing port, the side surface of the sludge clarifying tank is provided with an outlet, and the side surface outlet of the sludge clarifying tank is communicated with the wastewater adjusting tank; an air floatation wastewater outlet is formed in the side face of the air floatation tank and is respectively communicated with the double-membrane treatment unit and the air floatation circulating pump, the outlet of the air floatation circulating pump is communicated with the air saturation tank, and the side face outlet of the air saturation tank is communicated with the inlet of the air floatation tank;
the external salt-containing wastewater enters an air floatation tank after being regulated by a wastewater regulating tank, part of the air floatation wastewater treated by the air floatation tank enters a double-membrane treatment unit, and part of the air floatation wastewater is sent into an air saturation tank through an air floatation circulating pump in a form of return water to form saturated dissolved air water and then is circulated back to the air floatation tank; the bottom of the air flotation tank is connected with a sludge clarification tank and is used for periodically collecting sludge discharged from the bottom of the air flotation tank and floating oil on the top of the air flotation tank; supernatant of the sludge clarifying tank returns to the wastewater adjusting tank, and sludge at the lower part is delivered to an external sludge treatment system; the air saturation tank is connected with an external compressed air pipe, so that compressed air enters the air saturation tank to form saturated dissolved air water.
3. A high content of the compound of claim 2The salt wastewater zero-discharge treatment system is characterized in that the pressure of the external compressed air pipe is 0.4-0.8 Mpa (G), and the content of suspended matters in the external salt wastewater is 500-8000 mg/L; the single operation capacity of the air-bearing tank is 1m3/h~6000m3H; the mass fraction of the return water flow of the air flotation tank in the total amount of the air flotation wastewater is 15-60%.
4. The system of claim 2, wherein the double-membrane treatment unit comprises a microfiltration prefilter, a microfiltration filtration system, a reverse osmosis prefilter, a reverse osmosis feed booster pump and a reverse osmosis filtration system which are connected in sequence, wherein the microfiltration prefilter is connected with the air flotation tank;
filtering and removing impurities from the air flotation wastewater treated by the air flotation unit through a microfiltration prefilter, a microfiltration filtration system and a reverse osmosis prefilter to remove fine suspended matters, bacteria and silicon, pressurizing the air flotation wastewater by a reverse osmosis feed booster pump, then feeding the pressurized air flotation wastewater into a reverse osmosis filtration system to filter and concentrate the salt-containing wastewater, feeding the filtered water into an external tank area for recycling, and further concentrating the concentrated water in a high-pressure reverse osmosis unit; the microfiltration prefilter is used for removing solids with the particle size of more than 400 micrometers, and the microfiltration filtration system can be backwashed automatically or backwashed manually; the microfiltration and filtration system comprises a hollow fiber membrane in a membrane module mode, the pressure of the filtration system is 60 kPa (G) -500 kPa (G), the water recovery rate is more than 90%, and the effluent SDI is less than or equal to 3.
5. The system for zero discharge of wastewater with high salt content according to claim 4, wherein the reverse osmosis prefilter is a 5 μm filter element; the reverse osmosis filtration system comprises one-stage reverse osmosis or multi-stage reverse osmosis; the membrane module type adopts a roll membrane, and the filtration pressure is 1.5-7 Mpa (G); the water recovery rate is not lower than 75 percent; the TDS of the concentrated water is not less than 15000 mg/L.
6. The high-salinity wastewater zero-emission treatment system according to claim 4, wherein the high-pressure reverse osmosis unit comprises a reverse osmosis high-pressure pump, a high-pressure reverse osmosis filtration system and a concentrated water tank which are connected in sequence, and the reverse osmosis high-pressure pump is connected with the reverse osmosis filtration system;
the concentrated water of the double-membrane treatment unit enters a high-pressure reverse osmosis filtration system for further concentration after being pressurized by a reverse osmosis high-pressure pump; the concentrated high-concentration wastewater enters a concentrated water tank and then is sent to the next unit for treatment, and the filtered water is sent to a tank area for reuse; the high-pressure reverse osmosis filtration system comprises a first-stage high-pressure filtration or a multi-stage high-pressure filtration, and the working pressure is 8-12 Mpa; the high-pressure reverse osmosis filtration system comprises a butterfly tube type high-pressure membrane.
7. The high-salinity wastewater zero-emission treatment system according to claim 6, wherein the concentrated water evaporation unit comprises a concentrated water feed heat exchanger, a deaerator, a brine evaporator, a steam condensate tank, a condensate pump, an evaporation circulating pump, a salt seed circulator, a high-salinity wastewater tank and an air cooler;
the concentrated water feeding heat exchanger is connected with a concentrated water tank, an outlet of the concentrated water feeding heat exchanger is connected with an inlet of a deaerator, an outlet of the deaerator is connected with a brine evaporator, a bottom discharge port of the brine evaporator is connected with an inlet of an evaporation circulating pump, an outlet of the evaporation circulating pump is connected with an inlet at the top of the brine evaporator, two branches are arranged on a communication line of the evaporation circulating pump and the brine evaporator and are respectively connected with a salt seed circulator and a high-salt waste liquid tank, a top outlet of the salt seed circulator is connected with the high-salt waste liquid tank, a bottom outlet is connected with a communication line of the evaporation circulating pump and the brine evaporator, a strong brine steam outlet at the side of the brine evaporator is connected with an inlet of an air cooler, and an outlet of the air cooler is connected; a heating steam condensate outlet on the bottom side surface of the brine evaporator is connected with a steam condensate tank, and the steam condensate tank is respectively connected with a condensate pump and an inlet on the top of the brine evaporator;
feeding high-concentration wastewater from a high-concentration water tank into a feeding heat exchanger, primarily heating the wastewater to a temperature close to boiling temperature, and then feeding the wastewater into a deaerator, wherein the deaerator adopts steam stripping to remove carbon dioxide and other volatile matters; the material water after being regulated, heated and deoxidized enters a saline water evaporator for heating and evaporation, the saline water slurry after evaporation and concentration enters the bottom of the saline water evaporator, the saline water slurry continuously circulates to the top of the saline water evaporator through an evaporation circulating pump and is vertical to a heat exchange pipe for circulating evaporation and concentration, and part of the saline water slurry is extracted and enters a high-salinity waste liquid tank; salt seeds are mixed with circulating brine through the discharge at the bottom of the salt seed circulator, and clear water at the top of the salt seed circulator enters a high-salinity waste liquid tank; the circulating brine contains enough salt seeds for preventing scaling, the salt seeds circulator keeps the salt seeds with proper concentration in the brine, and the brine is concentrated under the condition that the heat transfer surface of the brine evaporator is not scaled; the water vapor evaporated by the strong brine in the brine evaporator is cooled by an air cooler and then enters a strong brine feeding heat exchanger to heat strong brine from the strong brine tank; heating steam in the brine evaporator exchanges heat with concentrated water and then enters a steam condensate tank, condensate is sent out through a condensate pump, and the steam is circulated back to the brine evaporator and mixed with external steam and then enters the brine evaporator to continuously evaporate the concentrated water in the brine evaporator.
8. The zero emission treatment system for wastewater with high salinity according to claim 7, characterized in that the brine evaporator is a falling film evaporator, and the heating mode comprises one or two of external steam supply heating and steam compression recycling.
9. The zero discharge treatment system for wastewater with high salt content according to claim 7, characterized in that after the high-concentration brine extracted from the high-salt waste liquid tank is crystallized and centrifuged by the crystallization and centrifugation unit, the crystallized salt is sent to the outside for treatment, and the mother liquid is returned to the concentrated water evaporation unit for circulation treatment.
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