CN107162308B - Membrane distillation evaporation crystallization process and system - Google Patents
Membrane distillation evaporation crystallization process and system Download PDFInfo
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- CN107162308B CN107162308B CN201710572744.4A CN201710572744A CN107162308B CN 107162308 B CN107162308 B CN 107162308B CN 201710572744 A CN201710572744 A CN 201710572744A CN 107162308 B CN107162308 B CN 107162308B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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Abstract
The invention discloses a membrane distillation evaporation crystallization process and a system, and relates to the technical field of membrane distillation. The invention provides a membrane distillation evaporation crystallization process, which comprises the following steps: pretreatment: removing suspended matters in the salt-containing wastewater, and adjusting the temperature of the salt-containing wastewater. And (3) membrane distillation: the salt-containing wastewater subjected to the pretreatment step is introduced into a membrane distillation reactor and subjected to a membrane distillation reaction to convert the salt-containing wastewater into a concentrated waste liquid. And (3) evaporating and crystallizing: and introducing the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization. The invention also provides a membrane distillation evaporation crystallization system applying the membrane distillation evaporation crystallization process. The method and the structure of the membrane distillation evaporation crystallization process and the system provided by the invention are simple and convenient to use. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
Description
Technical Field
The invention relates to the technical field of membrane distillation, in particular to a membrane distillation evaporation crystallization process and a system.
Background
In the industrial production processes of petrochemical industry, electric power, coal chemical industry and the like, the industrial production process is always a key enterprise for producing wastewater, and a large amount of salt-containing wastewater and salt-containing wastewater produced after waste acid and waste alkali neutralization can be produced in the production process. The waste water has high salt content, and if the waste water is directly discharged, surrounding soil can be damaged, the salt content of the water body is increased, and mineral resources are wasted. The prior art has the problems of large energy consumption, high investment, complex treatment process and the like.
Membrane separation technology is a separation technology that is driven by factors such as pressure difference, concentration difference, and potential difference, and is realized by size exclusion, charge repulsion, and physicochemical effects between a solute, a solvent, and a membrane. Compared with thermal concentration, the technology has the advantages of simple structure, easy operation and low operation temperature, and nanofiltration membrane, electrodialysis and reverse osmosis technologies are mainly applied to the wastewater with high salt content.
The existing treatment mode for the salt-containing wastewater is complex, the desalination rate is low, and the meeting rate for the treated reuse water is low.
Disclosure of Invention
The invention aims to provide a membrane distillation evaporation crystallization process which is simple in steps and easy to operate. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
Another object of the present invention is to provide a membrane distillation evaporative crystallization system which is simple in steps and easy to operate. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
The invention provides a technical scheme that:
a membrane distillation evaporation crystallization process is used for separating salt from salt-containing wastewater. The membrane distillation evaporation crystallization process comprises the following steps: pretreatment: removing suspended matters in the salt-containing wastewater, and adjusting the temperature of the salt-containing wastewater. And (3) membrane distillation: the salt-containing wastewater subjected to the pretreatment step is introduced into a membrane distillation reactor and subjected to a membrane distillation reaction to convert the salt-containing wastewater into a concentrated waste liquid. And (3) evaporating and crystallizing: and introducing the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization.
Further, the preprocessing step includes: and (3) filtering: and introducing the salt-containing wastewater contained in the water collecting tank into a filtering tank, and removing suspended matters in the salt-containing wastewater. And a heating step: and (3) introducing the salt-containing wastewater subjected to the filtering step into a heating tank, and heating the salt-containing wastewater. And a pressure adjusting step: and introducing the heated salt-containing wastewater into a pressure balance tank, and regulating the pressure in the pressure balance tank. The membrane distillation step comprises the step of introducing the salt-containing wastewater in the pressure balance tank into a membrane distillation device.
Further, the heating step comprises heating the salt-containing wastewater to 40-80 ℃.
Further, the pressure adjusting step includes introducing the saline wastewater contained in the heating tank to the pressure balancing tank by a metering pump or a centrifugal pump.
Further, the membrane distillation step comprises the step of leading out purified water converted by condensing water vapor through a purified water pump.
A membrane distillation, evaporation and crystallization system uses a membrane distillation, evaporation and crystallization process. The membrane distillation evaporation crystallization process comprises the following steps: pretreatment: removing suspended matters in the salt-containing wastewater, and adjusting the temperature of the salt-containing wastewater. And (3) membrane distillation: the salt-containing wastewater subjected to the pretreatment step is introduced into a membrane distillation reactor and subjected to a membrane distillation reaction to convert the salt-containing wastewater into a concentrated waste liquid. And (3) evaporating and crystallizing: and introducing the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization. The membrane distillation, evaporation and crystallization system comprises: pretreatment system: for removing suspended matters in the salt-containing wastewater and adjusting the temperature of the salt-containing wastewater. Membrane distillation system: and the pretreatment system is connected with the pretreatment system and is used for introducing the salt-containing wastewater subjected to the pretreatment step into a membrane distillation reactor and performing membrane distillation reaction so as to convert the salt-containing wastewater into concentrated waste liquid. And (3) an evaporative crystallization system: is connected with a membrane distillation system and is used for introducing the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization.
Further, the pretreatment system comprises a water collecting tank, a filtering tank, a heating tank and a pressure balancing tank, wherein the water collecting tank is connected with the filtering tank, the heating tank is connected with the filtering tank, one end of the pressure balancing tank is connected with the heating tank, and the other end of the pressure balancing tank is connected with the membrane distillation system.
Further, the pressure balance tank comprises a tank body, an inlet pipe, an outlet pipe, a pressure gauge and a pressure regulating member, wherein the inlet pipe and the outlet pipe can be communicated with the tank body, the pressure gauge is arranged in the tank body, and the pressure regulating member is communicated with the tank body so as to selectively regulate the pressure in the tank body. The inlet pipe is connected with the heating tank, and the outlet pipe is connected with the membrane distillation system.
Further, the pressure balance tank further comprises a first exhaust valve and a second exhaust valve. A first vent valve is connected to the inlet tube to open or close the inlet tube. A second vent valve is connected to the outlet tube to open or close the outlet tube.
Further, the pressure balance tank further comprises a heating element and a thermometer, and the heating element and the thermometer are arranged in the tank body.
Compared with the prior art, the membrane distillation evaporation crystallization process and system provided by the invention have the beneficial effects that:
the pretreatment step may remove suspended substances in the saline wastewater to prevent damage to equipment in the subsequent steps. The pretreatment step can also adjust the temperature of the brine wastewater and the pressure entering the membrane distillation step. The membrane distillation step can carry out membrane distillation reaction on the salt-containing wastewater subjected to the pretreatment step, and export the reuse water after the reaction. The evaporating crystallization step is carried out for evaporating crystallization, so that the separation treatment of the salt-containing wastewater is realized. The method and the structure of the membrane distillation evaporation crystallization process and the system provided by the invention are simple and convenient to use. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. Other relevant drawings may be made by those of ordinary skill in the art without undue burden from these drawings.
FIG. 1 is a schematic diagram of a membrane distillation, evaporation and crystallization system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pressure balance tank according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a pressure adjusting member according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a heating chamber according to a first embodiment of the present invention.
Icon: 10-a membrane distillation evaporation crystallization system; 100-a pretreatment system; 110-a water collecting tank; 120-filtration tank; 130-heating the tank; 140-a pressure balancing tank; 141-a tank body; 142-inlet pipe; 143-outlet pipe; 144-manometer; 145-pressure regulating member; 1451-a first vent tube; 1452-a second vent tube; 1453-third vent; 1454-fourth air duct; 1455-a first air guide valve; 1456-a second air guide valve; 1457-a third air guide valve; 1458-fourth air guide valve; 1459-pressurizing pump; 1450-a heating chamber; 14501-a chamber body; 14502-heating element; 14503-drying the filter screen; 146-a first exhaust valve; 147-a second exhaust valve; 148-heating element; 149-thermometer; 200-membrane distillation system; 300-evaporative crystallization system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, terms such as "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
First embodiment
Referring to fig. 1, the present embodiment provides a membrane distillation, evaporation and crystallization system 10, which has a simple structure and is convenient to use. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
The membrane distillation, evaporation and crystallization system 10 provided in this embodiment includes a pretreatment system 100, a membrane distillation system 200, and an evaporation and crystallization system 300.
The pretreatment system 100 provided in this embodiment is used to remove suspended matters in the saline wastewater and adjust the temperature of the saline wastewater. The membrane distillation system 200 is connected to the pretreatment system 100 and is used to introduce the salt-containing wastewater subjected to the pretreatment step into the membrane distillation system 200 and perform a membrane distillation reaction to convert the salt-containing wastewater into a concentrated waste liquid. The evaporative crystallization system 300 is connected to the membrane distillation system 200 and is used for introducing the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization.
In this embodiment, the pretreatment system 100 includes a water collection tank 110, a filtration tank 120, a heating tank 130, and a pressure equalization tank 140, wherein the water collection tank 110 is connected to the filtration tank 120, the heating tank 130 is connected to the filtration tank 120, one end of the pressure equalization tank 140 is connected to the heating tank 130, and the other end of the pressure equalization tank 140 is connected to the membrane distillation system 200.
It is understood that the water collection tank 110 is used to hold brine waste. The filter tank 120 is used to filter the saline wastewater to remove suspended matters in the saline wastewater. The fine suspended matters of the salt-containing wastewater treated by the filter tank 120 are removed so as not to damage the membrane surface of the subsequent membrane distillation system 200. The heating tank 130 is used to heat the saline wastewater, and preferably, the heating tank 130 heats and maintains the saline wastewater at a temperature between 40-80 ℃. The pressure balance tank 140 is used for adjusting the pressure value of the salt-containing wastewater entering the membrane distillation system 200 so as to ensure the normal operation of the membrane distillation reaction.
Referring to fig. 2, in the present embodiment, the pressure balance tank 140 includes a tank body 141, an inlet pipe 142, an outlet pipe 143, a pressure gauge 144, a pressure adjusting member 145, a first exhaust valve 146, a second exhaust valve 147, a heating member 148 and a thermometer 149, wherein the inlet pipe 142 and the outlet pipe 143 can be in communication with the tank body 141, the pressure gauge 144 is installed in the tank body 141, and the pressure adjusting member 145 is in communication with the tank body 141 to selectively adjust the pressure in the tank body 141. Inlet pipe 142 is connected to heating tank 130 and outlet pipe 143 is connected to membrane distillation system 200.
In the present embodiment, a first exhaust valve 146 is connected to the inlet pipe 142 to open or close the inlet pipe 142. The second exhaust valve 147 is connected to the outlet pipe 143 to open or close the outlet pipe 143.
In this embodiment, both the heating element 148 and the thermometer 149 are mounted within the canister body 141. The heating element 148 is used for heating the tank body 141, and the thermometer 149 is used for measuring the temperature of the liquid contained in the tank body 141. The user may decide whether to continue to turn on the heating element 148 based on the reading on the thermometer 149.
Referring to fig. 3, the pressure regulator 145 includes a first vent tube 1451, a second vent tube 1452, a third vent tube 1453, a fourth vent tube 1454, a first air guiding valve 1455, a second air guiding valve 1456, a third air guiding valve 1457, a fourth air guiding valve 1458, a pressurizing pump 1459 and a heating chamber 1450. The first air guide valve 1455 is connected to the first air vent pipe 1451 to open or close the first air vent pipe 1451. The second air guide valve 1456 is connected to the second air vent pipe 1452 to open or close the second air vent pipe 1452. The third air guide valve 1457 is connected to the third air vent 1453 to open or close the third air vent 1453. The fourth air guide valve 1458 is connected to the fourth air guide tube 1454 to open or close the fourth air guide tube 1454. The first vent pipe 1451 communicates with the tank body 141, the second vent pipe 1452 communicates with the pressurizing pump 1459, and the third vent pipe 1453 communicates with the heat generating chamber 1450. One end of the first vent pipe 1451, which is far from the tank body 141, one end of the second vent pipe 1452, which is far from the pressurizing pump 1459, one end of the third vent pipe 1453, which is far from the heating chamber 1450, is communicated with the fourth vent pipe 1454.
In this embodiment, in order to facilitate the connection among the first vent pipe 1451, the second vent pipe 1452, the third vent pipe 1453 and the fourth vent pipe 1454, the pressure adjusting member 145 further includes a four-way pipe. The four connecting ends of the four-way pipe are respectively connected with a first vent pipe 1451, a second vent pipe 1452, a third vent pipe 1453 and a fourth vent pipe 1454.
It is appreciated that when the first air guide valve 1455 is in an open state, any one or more of the second air guide valve 1456, the third air guide valve 1457 and the fourth air guide valve 1458 may be opened or closed. While the first air guiding valve 1455 is in a closed state, the second air guiding valve 1456, the third air guiding valve 1457 and the fourth air guiding valve 1458 are preferably also in a closed state. Of course, not limited to this, when the first air guide valve 1455 is in the closed state, any one of the fourth air guide valve 1458 and the second air guide valve 1456 and the third air guide valve 1457 or both of the second air guide valve 1456 and the third air guide valve 1457 may be opened.
Referring to fig. 4, in the present embodiment, the heat generating chamber 1450 includes a chamber body 14501, a heat generating member 14502 and a drying screen 14503. The third gas-communication tube 1453 communicates with the chamber body 14501, and the heat generating member 14502 is provided in the chamber body 14501. The drying screen 14503 is disposed at a junction between the chamber body 14501 and the third vent 1453.
It is understood that heat generating element 14502 is used to heat the gas within chamber body 14501 and that drying screen 14503 is used to further dehydrate and dry the heated gas.
In this embodiment, the heating element 148 is a heating wire. Of course, the present invention is not limited thereto, and the heating element 148 may have other structures in other embodiments of the present invention, which will not be described herein.
The beneficial effects of the membrane distillation evaporation crystallization system 10 provided in this embodiment are: the pretreatment system 100 can remove suspended matter from the saline wastewater and adjust the temperature of the saline wastewater. The membrane distillation system 200 may perform a membrane distillation reaction on the salt-containing wastewater subjected to the pretreatment step. The evaporative crystallization system 300 can guide the concentrated waste liquid into an evaporative crystallization device for evaporative crystallization, so as to realize separation treatment of the salt-containing waste water. The membrane distillation, evaporation and crystallization system 10 provided in this embodiment is simple in structure and convenient to use. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water. Second embodiment
The embodiment provides a membrane distillation evaporation crystallization process which is simple in steps and easy to operate. Meanwhile, the method has the characteristics of high desalination rate and high recovery rate of reuse water.
The membrane distillation evaporation crystallization process provided by the embodiment is used for separating salt from the salt-containing wastewater.
The film distillation evaporation crystallization process provided in this embodiment includes: a pretreatment step, a membrane distillation step and an evaporative crystallization step.
Pretreatment: removing suspended matters in the salt-containing wastewater, and adjusting the temperature of the salt-containing wastewater.
Preferably, the pretreatment step comprises: a filtering step, a heating step and a pressure regulating step. The membrane distillation step includes introducing the brine wastewater in the pressure equalization tank 140 into a membrane distillation system 200.
And (3) filtering: the salt-containing wastewater contained in the water collecting tank 110 is introduced into the filter tank 120, and suspended matters in the salt-containing wastewater are removed.
And a heating step: the salt-containing wastewater subjected to the filtering step is introduced into the heating tank 130, and the salt-containing wastewater is heated.
And a pressure adjusting step: the heated salt-containing wastewater is introduced into the pressure balance tank 140, and the pressure in the pressure balance tank 140 is adjusted.
Preferably, the heating step comprises heating the salt-containing wastewater to a temperature of 40-80 ℃.
Preferably, the pressure adjusting step includes introducing the saline wastewater contained in the heating tank 130 to the pressure balancing tank by a metering pump or a centrifugal pump.
And (3) membrane distillation: the salt-containing wastewater subjected to the pretreatment step is introduced into the reactor of the membrane distillation system 200, and a membrane distillation reaction is performed to convert the salt-containing wastewater into a concentrated waste liquid.
Preferably, the membrane distillation step comprises conducting out purified water converted after condensation of water vapor by a purified water pump.
And (3) evaporating and crystallizing: the concentrated waste liquid is introduced into the evaporative crystallization system 300, and is subjected to evaporative crystallization.
The film distillation evaporation crystallization process provided by the embodiment has the beneficial effects that: the pretreatment step may remove suspended substances in the saline wastewater to prevent damage to equipment in the subsequent steps. The pretreatment step can also adjust the temperature of the brine wastewater and the pressure entering the membrane distillation step. The membrane distillation step can carry out membrane distillation reaction on the salt-containing wastewater subjected to the pretreatment step, and export the reuse water after the reaction. The evaporating crystallization step is carried out for evaporating crystallization, so that the separation treatment of the salt-containing wastewater is realized.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A membrane distillation evaporation crystallization process for separating salt from salt-containing wastewater, the process comprising:
pretreatment: removing suspended matters in the salt-containing wastewater, and adjusting the temperature of the salt-containing wastewater;
and (3) membrane distillation: introducing the salt-containing wastewater subjected to the pretreatment step into a membrane distillation reactor, and performing membrane distillation reaction to convert the salt-containing wastewater into concentrated waste liquid;
and (3) evaporating and crystallizing: introducing the concentrated waste liquid into an evaporation crystallization device for evaporation crystallization;
the pretreatment step comprises the following steps:
and (3) filtering: introducing the salt-containing wastewater contained in a water collecting tank into a filtering tank, and removing suspended matters in the salt-containing wastewater;
and a heating step: introducing the salt-containing wastewater subjected to the filtering step into a heating tank, and heating the salt-containing wastewater to 40-80 ℃;
and a pressure adjusting step: introducing the heated salt-containing wastewater into a pressure balance tank, and regulating the pressure in the pressure balance tank;
the membrane distillation step comprises the step of introducing the salt-containing wastewater in the pressure balance tank into the membrane distillation device;
the pressure regulating step comprises the step of leading the salt-containing wastewater contained in the heating tank into the pressure balancing tank through a metering pump or a centrifugal pump, wherein the pressure balancing tank comprises a tank body and a pressure regulating piece, and the pressure regulating piece is communicated with the tank body so as to selectively regulate the pressure in the tank body;
the pressure regulating part comprises a first vent pipe, a second vent pipe, a third vent pipe, a fourth vent pipe, a first air guide valve, a second air guide valve, a third air guide valve, a fourth air guide valve, a pressurizing pump and a heating chamber, wherein the first vent pipe is communicated with the tank body, the first air guide valve is connected with the first vent pipe, the second vent pipe is communicated with the pressurizing pump, the second air guide valve is connected with the second vent pipe, the third vent pipe is communicated with the heating chamber, the third air guide valve is connected with the third vent pipe, the first vent pipe is far away from one end of the tank body, the second vent pipe is far away from one end of the pressurizing pump, the third vent pipe is far away from one end of the heating chamber and the fourth vent pipe is communicated with the fourth vent pipe, and the fourth air guide valve is connected with the fourth vent pipe.
2. The process according to claim 1, wherein the membrane distillation step comprises conducting out purified water converted by condensing water vapor by a purified water pump.
3. A membrane distillation evaporative crystallization system employing the membrane distillation evaporative crystallization process according to any one of claims 1-2, characterized in that the membrane distillation evaporative crystallization system comprises:
pretreatment system: for removing suspended matters in the salt-containing wastewater and adjusting the temperature of the salt-containing wastewater;
membrane distillation system: the pretreatment system is connected with the pretreatment system and is used for introducing the salt-containing wastewater subjected to the pretreatment step into the membrane distillation reactor and performing membrane distillation reaction to convert the salt-containing wastewater into concentrated waste liquid;
and (3) an evaporative crystallization system: the device is connected with the membrane distillation system and is used for guiding the concentrated waste liquid into the evaporation crystallization device for evaporation crystallization;
the pretreatment system comprises a pressure balance tank, a water collecting tank, a filtering tank and a heating tank, wherein the water collecting tank is connected with the filtering tank, the heating tank is connected with the filtering tank, the pressure balance tank comprises a tank body, a pressure adjusting piece, an inlet pipe, an outlet pipe and a pressure gauge, and the pressure adjusting piece is communicated with the tank body so as to selectively adjust the pressure in the tank body; the inlet pipe and the outlet pipe are communicated with the tank body, and the pressure gauge is arranged in the tank body; the inlet pipe is connected with the heating tank, and the outlet pipe is connected with the membrane distillation system;
the pressure regulating part comprises a first vent pipe, a second vent pipe, a third vent pipe, a fourth vent pipe, a first air guide valve, a second air guide valve, a third air guide valve, a fourth air guide valve, a pressurizing pump and a heating chamber, wherein the first vent pipe is communicated with the tank body, the first air guide valve is connected with the first vent pipe, the second vent pipe is communicated with the pressurizing pump, the second air guide valve is connected with the second vent pipe, the third vent pipe is communicated with the heating chamber, the third air guide valve is connected with the third vent pipe, the first vent pipe is far away from one end of the tank body, the second vent pipe is far away from one end of the pressurizing pump, the third vent pipe is far away from one end of the heating chamber and the fourth vent pipe is communicated with the fourth vent pipe, and the fourth air guide valve is connected with the fourth vent pipe.
4. The membrane distillation evaporative crystallization system of claim 3, wherein the pressure equalization tank further comprises a first vent valve and a second vent valve;
the first exhaust valve is connected with the inlet pipe so as to open or close the inlet pipe;
the second exhaust valve is connected with the outlet pipe to open or close the outlet pipe.
5. A membrane distillation evaporative crystallization system according to claim 3, wherein the pressure equalization tank further comprises a heating element and a thermometer, both of which are mounted within the tank body.
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| CN204261564U (en) * | 2014-11-21 | 2015-04-15 | 云南铜业股份有限公司 | A kind of distillation device processing brine waste |
| KR20160149545A (en) * | 2015-06-18 | 2016-12-28 | (주)세프라텍 | Membrane distillation- crystallization system and method |
| CN105444973A (en) * | 2015-11-17 | 2016-03-30 | 上海航天精密机械研究所 | Low-temperature-pressure automatic pressure-increasing balance device |
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