CN214270585U - Salt separation crystallization water-saving system for treating circulating sewage - Google Patents
Salt separation crystallization water-saving system for treating circulating sewage Download PDFInfo
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- CN214270585U CN214270585U CN202121791493.7U CN202121791493U CN214270585U CN 214270585 U CN214270585 U CN 214270585U CN 202121791493 U CN202121791493 U CN 202121791493U CN 214270585 U CN214270585 U CN 214270585U
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Abstract
The patent relates to a salt separation crystallization water-saving system for treating circulating sewage, which comprises a sedimentation tank, an ultrafiltration membrane device, a first water production tank, a continuous nanofiltration membrane device, a second water production tank, a reverse osmosis membrane device, a third water production tank and an evaporative crystallization system which are sequentially connected; wherein, set up agitating unit and alkali lye in the sedimentation tank and add the device, alkali lye adds the device and is used for throwing lime and sodium carbonate solution in to the cell body, and agitating unit is used for stirring waste water and the lime and the sodium carbonate solution of interpolation in the cell body, and calcium magnesium gets rid of the reaction with higher speed for the reaction is more complete, and calcium magnesium gets rid of the effect better. The utility model discloses the realization realizes recycle to the waste water that circulative cooling system produced, utilizes agitating unit to stir the waste water solution in the sedimentation tank in the pretreatment process moreover, promotes calcium magnesium ion's efficiency and effect of getting rid of.
Description
Technical Field
This patent belongs to circulation blowdown water treatment technical field, particularly relates to a divide salt crystallization water saving system who handles circulation blowdown water.
Background
The circulating sewage is wastewater generated by a circulating cooling system, and the wastewater contains inorganic salts such as sodium, calcium, magnesium, chloride ions, sulfate radicals and the like and organic pollutants. The circulating sewage is generally discharged to a sewage treatment plant, but the problem of water resource waste exists in the discharge of circulating water in water-deficient areas.
The circulating sewage can be treated by a pretreatment, a continuous nanofiltration membrane, a reverse osmosis membrane and an evaporative crystallization system to produce crystallized salt and fresh water, and the fresh water is recycled to a circulating cooling water system, so that the aim of saving water is fulfilled. In the prior art, a salt separation crystallization process is adopted, wherein salt water passes through a nanofiltration membrane to obtain nanofiltration permeate and nanofiltration concentrate; passing the nanofiltration concentrate and the nanofiltration permeate through a membrane concentration device to obtain produced water and concentrated water; concentrated water enters an evaporation system for concentration and crystallization; and dehydrating and drying the crystal to obtain pure salt or anhydrous nitre. The process can realize the extraction of high-purity salt and anhydrous nitrate from strong brine which is difficult to treat in a sewage treatment station, but the device cannot realize the cyclic utilization of wastewater.
In addition, in the pretreatment process of the circulating sewage, the sedimentation tank is often required to be used for containing the sewage, and the reagent is added to remove calcium and magnesium ions in the sewage, but the sedimentation tank has large sewage treatment capacity and large volume, so that the calcium and magnesium ion removal efficiency is low, longer reaction time is required, and the wastewater treatment efficiency is influenced.
Therefore, the salt separation crystallization water-saving system for treating the circulating sewage is provided for the field of circulating sewage treatment in a targeted manner, and the technical problem to be solved is urgent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a divide salt crystallization water saving system of processing circulation blow off water realizes recycle to the waste water that circulative cooling system produced to solve the outer circulation water of water-deficient area and have one or more in the inefficiency of wasting the water resource and utilizing the sedimentation tank to get rid of calcium magnesium in the preliminary treatment in-process, the poor problem of effect.
The purpose of the utility model is realized like this:
a salt separation crystallization water-saving system for treating circulating sewage comprises a sedimentation tank, a water inlet pipe, a water outlet pipe and a water outlet pipe, wherein the sedimentation tank is configured to contain sewage and serve as a place for removing calcium and magnesium ions in the sewage;
the sedimentation tank comprises a tank body, the tank body is provided with a top wall, a bottom wall and a side wall, and the top wall of the tank body is provided with a stirring device and an alkali liquor adding device; the bottom wall of the tank body is of an inverted cone structure, and a discharge hole is formed in the top end of the inverted cone bottom wall; the side wall of the tank body is provided with a sewage inlet pipe, a water outlet pipe and a concentrated water return pipe.
Further, agitating unit includes agitator motor, and agitator motor is connected with the (mixing) shaft, and the tip of (mixing) shaft sets up V-arrangement stirring leaf.
Further, the curved surface that the outer profile of V-arrangement stirring leaf sweeps is parallel with the inner wall curved surface of back taper diapire.
Furthermore, a stirring frame is arranged on a stirring shaft of the stirring motor, and the stirring frame is formed by splicing a plurality of rectangular frames.
Further, handle branch salt crystallization water saving system of circulation blow off water, still include: the water inlet of the ultrafiltration membrane device is connected with the water outlet pipe of the sedimentation tank so as to remove suspended matters in the wastewater fed from the sedimentation tank;
a water inlet of the first water production tank is connected with a water production port of the ultrafiltration membrane device;
the continuous nanofiltration membrane device is used for separating a divalent salt solution; the water inlet of the continuous nanofiltration membrane device is communicated with the water outlet of the first water production tank;
a water inlet of the second water production tank is connected with a water production port of the continuous nanofiltration membrane device;
the first water inlet of the reverse osmosis membrane device is connected with the water outlet of the second water production tank;
a water inlet of the third product water tank is connected with a concentrated water outlet of the reverse osmosis membrane device;
an evaporative crystallization system, the water inlet of which is connected with the water outlet of the third product water tank,
and a water inlet of the water return tank is connected with a water production port of the evaporative crystallization system, and a water outlet of the water return tank is connected with a second water inlet of the reverse osmosis membrane device.
Furthermore, the outlet pipe is installed on the lateral wall of cell body through thick filtering piece, and thick filtering piece is connected with the lateral wall of cell body is detachable.
Furthermore, a concentrated water outlet of the continuous nanofiltration membrane device is connected with the sedimentation tank through a concentrated water return pipe so as to enable concentrated water generated by the continuous nanofiltration membrane device to return to the sedimentation tank.
Furthermore, the salt separation and crystallization water-saving system for treating the circulating sewage also comprises a crystallized salt drying system for collecting the salt separated by the centrifuge.
Further, the continuous nanofiltration membrane device comprises: first high-pressure pump, first receive filter membrane, second high-pressure pump and the second that connects gradually receive the filter membrane, and first product water tank is connected with first high-pressure pump, and first receive filter membrane and second receive filter membrane all to be connected with second product water tank, and the second receives filter membrane to be connected with the sedimentation tank.
Further, the evaporative crystallization system comprises: the system comprises a heat exchanger, a heater, a crystallizer, a vapor compressor, a circulating pump and a centrifuge.
Compared with the prior art, the utility model discloses a salt crystal water saving system that divides of processing circulation blow off water has one of following beneficial effect at least:
1. calcium and magnesium ions are removed by using a sedimentation tank, suspended matters in wastewater are removed by using an ultrafiltration membrane device, circulating sewage is separated into secondary salt by using a continuous nanofiltration membrane, the main component of concentrated water of the continuous nanofiltration membrane device is 3-12% of mixed salt solution, the main component of produced water of a reverse osmosis membrane device is 0.01-0.05% of salt solution, the main component of produced water of an evaporative crystallization system is 0.005-0.03% of salt solution, the amount of concentrated water entering the evaporative crystallization system is greatly reduced, the equipment, the floor space cost and the operating cost of the evaporative system are reduced, and water of a water return tank is used for circularly supplementing water, so that the discharge of circulating water is reduced, and the purpose of saving water is realized.
2. Through set up agitating unit and alkali lye in the sedimentation tank and add the device, the alkali lye adds the device and is used for throwing lime and sodium carbonate solution in to the cell body, and agitating unit is used for stirring waste water and the lime and the sodium carbonate solution of interpolation in the cell body, and calcium magnesium gets rid of the reaction with higher speed for the reaction is more complete, and calcium magnesium gets rid of the effect better.
3. The diapire of cell body is the back taper structure, and the top of back taper diapire sets up the discharge gate, through setting up the discharge gate at the least significant end of back taper diapire for solid particle impurity and the slope gathering of removing the calcium magnesium in-process production are convenient for discharge, the drain in the bottom of cell body in the waste water.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic view of a salt separation crystallization water saving system for treating circulating sewage provided by the present invention;
FIG. 2 is a schematic structural diagram of a sedimentation tank provided by the present invention;
fig. 3 is a schematic view of the continuous nanofiltration membrane device provided by the present invention;
FIG. 4 is a schematic view of an evaporative crystallization system provided by the present invention;
reference numerals:
1. a sedimentation tank; 1-1, a pool body; 1-2, a stirring motor; 1-3, stirring frame; 1-4, V-shaped stirring blades; 1-5, an alkali liquor adding device; 1-6, a discharge hole; 1-7, a sewage inlet pipe; 1-8, a concentrated water return pipe; 1-9, coarse filtration; 1-10 parts of water outlet pipe; 2. an ultrafiltration membrane device; 3. a first water production tank; 4. a continuous nanofiltration membrane device; 4-1, a first high pressure pump; 4-2, a first nanofiltration membrane; 4-3, a second high pressure pump; 4-4, a second nanofiltration membrane; 5. a second water production tank; 6. a reverse osmosis membrane device; 7. a third water production tank; 8. an evaporative crystallization system; 8-1, a heat exchanger; 8-2, a heater; 8-3, a crystallizer; 8-4, a vapor compressor; 8-5, circulating pump; 8-6, a centrifuge; 9. a water return tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For the purpose of facilitating understanding of the embodiments of the present application, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
The utility model discloses a concrete embodiment discloses a divide salt crystallization water saving system of processing circulation blow off water, as shown in figure 1, include:
a sedimentation tank 1 configured to contain sewage and serve as a place for removing calcium and magnesium ions in the sewage;
an ultrafiltration membrane device 2, wherein the water inlet of the ultrafiltration membrane device 2 is connected with the sedimentation tank 1 so as to remove suspended matters in the wastewater fed from the sedimentation tank 1;
a water inlet of the first water production tank 3 is connected with a water production port of the ultrafiltration membrane device 2;
the continuous nanofiltration membrane device 4 is used for separating a divalent salt solution; a water inlet of the continuous nanofiltration membrane device 4 is communicated with a water outlet of the first water production tank 3;
a water inlet of the second water production tank 5 is connected with a water production port of the continuous nanofiltration membrane device 4;
a first water inlet of the reverse osmosis membrane device 6 is connected with a water outlet of the second water production tank 5;
a water inlet of the third product water tank 7 is connected with a concentrated water outlet of the reverse osmosis membrane device 6;
an evaporative crystallization system 8, the water inlet of the evaporative crystallization system 8 is connected with the water outlet of the third product water tank 7,
a water inlet of the water return tank 9 is connected with a water production port of the evaporative crystallization system 8.
Specifically, as shown in fig. 1 and 2, the salt separation crystallization water saving system for treating the circulating sewage of the embodiment comprises: the device comprises a sedimentation tank 1, an ultrafiltration membrane device 2, a first water production tank 3, a continuous nanofiltration membrane device 4, a second water production tank 5, a reverse osmosis membrane device 6, a third water production tank 7 and an evaporative crystallization system 8 which are connected in sequence; the sedimentation tank 1 is used for adding lime and sodium carbonate solution to remove calcium and magnesium ions in water; the ultrafiltration membrane device 2 is used for removing suspended matters in the wastewater; the continuous nanofiltration membrane device 4 is used for separating a divalent salt solution; the reverse osmosis membrane device 6 is used for concentrating the wastewater; the evaporative crystallization system 8 is used for evaporating and crystallizing reverse osmosis concentrated water into salt, and the concentrated water is recycled after evaporation and condensation; the evaporative crystallization system 8 is connected with a water return tank 9, the water return tank 9 is connected with the reverse osmosis membrane device 6, and the water return tank 9 is used for circulating the produced water of the evaporative crystallization system 8 to the reverse osmosis membrane device 6; the concentrated water outlet of the continuous nanofiltration membrane device 4 is connected with the sedimentation tank 1 through a concentrated water return pipe 1-8 so as to enable the concentrated water generated by the continuous nanofiltration membrane device 4 to return to the sedimentation tank 1.
In order to remove calcium and magnesium in the sewage, lime and sodium carbonate solution are added into the sedimentation tank 1, in order to improve the reaction effect, a stirring device is arranged in the sedimentation tank 1, the solution stirring is accelerated by the stirring device, the reaction time is shortened, and the removal efficiency of calcium and magnesium in the sewage is improved.
As shown in fig. 2, the sedimentation tank 1 comprises a tank body 1-1, the tank body 1-1 is provided with a top wall, a bottom wall and a side wall, the top wall of the tank body 1-1 is provided with a stirring device and an alkali liquor adding device 1-5, the alkali liquor adding device 1-5 is used for adding lime and sodium carbonate solution into the tank body 1-1, the stirring device is used for stirring the wastewater in the tank body 1-1 and the added lime and sodium carbonate solution, so that the calcium and magnesium removal reaction is accelerated, the reaction is more complete, and the calcium and magnesium removal effect is better; the bottom wall of the tank body 1-1 is of an inverted cone structure, the discharge port 1-6 is arranged at the top end of the inverted cone bottom wall, and the discharge port 1-6 is arranged at the lowest end of the inverted cone bottom wall, so that solid particle impurities in the wastewater and solid substances generated in the calcium and magnesium removal process are gathered at the bottom end of the tank body along the slope of the bottom wall, and the wastewater is convenient to discharge and clean; the side wall of the tank body 1-1 is provided with a sewage inlet pipe 1-7, a water outlet pipe 1-10 and a concentrated water return pipe 1-8 for connecting with upstream and downstream equipment of the tank body 1-1.
In one optional embodiment, the alkali liquor adding device 1-5 is provided with a valve and a flowmeter, and the dosage of lime and sodium carbonate solution added into the sedimentation tank 1 can be accurately controlled according to the volume, concentration and pH value of the wastewater solution fed into the tank body 1-1, so that calcium and magnesium in water can be effectively removed, and the scaling of the continuous nanofiltration membrane device 4 can be avoided.
In this embodiment, agitating unit includes agitator motor 1-2, agitator motor 1-2 is connected with the (mixing) shaft, the tip of (mixing) shaft sets up V-arrangement stirring leaf 1-4, optionally, V-arrangement stirring leaf 1-4 includes 2-3 blades, the end fixing of blade is at the tip of (mixing) shaft, the angle between blade and the (mixing) shaft is 45-80, through setting up the stirring leaf of bottom to cross-section V-arrangement structure, can stir 1-1 bottom V-arrangement space of cell body, the stirring blind area has been reduced, make the reaction effect better.
Furthermore, the curved surface swept by the external contour of the V-shaped stirring blades 1-4 is parallel to the curved surface of the inner wall of the inverted cone-shaped bottom wall, a certain distance is reserved between the external contour of the V-shaped stirring blades 1-4 and the curved surface of the inner wall of the inverted cone-shaped bottom wall, and the distance is used for allowing impurity particles and solid containing calcium and magnesium to slide down and be accumulated to the bottom end of the tank body.
As the upper part of the tank body 1-1 is of a cylindrical barrel structure and the diameter of the cylindrical barrel is larger, in order to improve the reaction rate of calcium and magnesium removal, stirring blades are also arranged in the middle and upper regions of the tank body 1-1.
Furthermore, a stirring frame 1-3 is arranged on a stirring shaft of the stirring motor 1-2, the stirring frame 1-3 is formed by splicing a plurality of rectangular frames, and the stirring blades on the upper portion are arranged into the stirring frame, so that the transverse and longitudinal stirring ranges are increased, and the stirring effect is better.
Considering that impurity particles in the wastewater and solid substances generated in the calcium and magnesium removal process can enter the ultrafiltration membrane device 2 through the water outlet pipe 1-10, and the treatment effect of the ultrafiltration membrane device 2 is influenced. Therefore, the wastewater entering the ultrafiltration membrane device 2 is subjected to pre-filtration treatment, specifically, the water outlet pipe 1-10 is installed on the side wall of the tank body 1-1 through a coarse filtration piece 1-9, the coarse filtration piece 1-9 is detachably connected with the side wall of the tank body 1-1, fine particles in the wastewater entering the ultrafiltration membrane device 2 can be preliminarily removed through the coarse filtration piece 1-9, the coarse filtration piece 1-9 is arranged to be a detachable structure, the detachment and replacement are convenient, and after the equipment runs for a period of time, the coarse filtration piece 1-9 is replaced to ensure the coarse filtration effect.
As shown in fig. 3, the continuous nanofiltration membrane apparatus 4 includes: the device comprises a first high-pressure pump 4-1, a first nanofiltration membrane 4-2, a second high-pressure pump 4-3 and a second nanofiltration membrane 4-4 which are sequentially connected, wherein a first water production tank 3 is connected with the first high-pressure pump 4-1, the first nanofiltration membrane 4-2 and the second nanofiltration membrane 4-4 are both connected with a second water production tank 5, and the second nanofiltration membrane 4-4 is connected with a sedimentation tank 1.
As shown in fig. 4, the evaporative crystallization system 8 includes: the heat exchanger 8-1, the heater 8-2, the crystallizer 8-3, the vapor compressor 8-4, the circulating pump 8-5 and the centrifuge 8-6 are connected, the heat exchanger 8-1, the crystallizer 8-3, the vapor compressor 8-4, the circulating pump 8-5 and the centrifuge 8-6 are all connected with the heater 8-2, the heat exchanger 8-1 is respectively connected with the third production water tank 7 and the return water tank 9, the vapor compressor 8-4 is connected with the crystallizer 8-3, and the circulating pump 8-5 is respectively connected with the crystallizer 8-3 and the centrifuge 8-6; the interior of the heater 8-2 is divided into a tube side and a shell side, the tube side of the heater 8-2 is respectively connected with the heat exchanger 8-1, the crystallizer 8-3, the circulating pump 8-5 and the centrifuge 8-6, and the shell side of the heater 8-2 is respectively connected with the heat exchanger 8-1 and the vapor compressor 8-4.
In the embodiment, the salt separation and crystallization water-saving system for treating the circulating sewage further comprises a crystallized salt drying system which is independently arranged for collecting the salt separated by the centrifuge 8-6.
The implementation process is as follows: introducing wastewater into a sedimentation tank 1, adding lime and sodium carbonate solution into the sedimentation tank 1 to remove calcium and magnesium in the water, avoiding scaling of a continuous nanofiltration membrane device 4, precipitating the wastewater in the sedimentation tank 1, then filtering the wastewater in a ultrafiltration membrane device 2, and enabling the turbidity of the wastewater to be less than 0.1NTU and then entering a first product water tank 3;
the wastewater in the first water production tank 3 enters a continuous nanofiltration membrane device 4, the wastewater enters a first nanofiltration membrane 4-2 through a first high-pressure pump 4-1, monovalent salt solution and divalent salt solution are separated through the first nanofiltration membrane 4-2, the water produced by the first nanofiltration membrane 4-2 enters a second water production tank 5, the concentrated water produced by the first nanofiltration membrane 4-2 enters a second nanofiltration membrane 4-4 through a second high-pressure pump 4-3, the water produced by the second nanofiltration membrane 4-4 enters a second water production tank 5, and the concentrated water produced by the second nanofiltration membrane 4-4 returns to a sedimentation tank 1.
The wastewater of the second water production tank 5 enters a reverse osmosis membrane device 6, is further concentrated and then is discharged into a third water production tank 7, the produced water of the reverse osmosis membrane device 6 is discharged into a water return tank 9, and the wastewater of the third water production tank 7 flows into an evaporative crystallization system 8; waste water in the third production water tank 7 is heated by a heat exchanger 8-1 and then enters a tube pass of a heater 8-2, the waste water is heated by the heater 8-2 and then enters a crystallizer 8-3, steam generated by the crystallizer 8-3 enters a steam compressor 8-4, the steam is compressed by the steam compressor 8-4 and then enters a shell pass of the heater 8-2, the steam is condensed into high-temperature water after passing through the heater 8-2, and the high-temperature water enters the heat exchanger 8-1 and is further cooled and then is discharged to a water return tank 9; after the salt solution generated by the crystallizer 8-3 is pressurized by a circulating pump 8-5, part of the salt solution enters a tube pass circulation of a heater 8-2, part of the salt solution enters a centrifuge 8-6 for salt water separation, salt separated by the centrifuge 8-6 is discharged to a crystallized salt drying system for treatment, and mother liquor separated by the centrifuge 8-6 returns to the heater 8-2 for circulation.
Compared with the prior art, the salt separation crystallization water saving system for treating the circulating sewage provided by the embodiment utilizes the sedimentation tank to remove calcium and magnesium ions, utilizes the ultrafiltration membrane device to remove suspended matters in wastewater, utilizes the continuous nanofiltration membrane to separate divalent salt from the circulating sewage, the main component of the concentrated water of the continuous nanofiltration membrane device is 3% -12% mixed salt solution, the main component of the produced water of the reverse osmosis membrane device is 0.01% -0.05% salt solution, the main component of the produced water of the evaporation crystallization system is 0.005% -0.03% salt solution, the amount of the concentrated water entering the evaporation crystallization system is greatly reduced, the equipment, the floor space cost and the operating cost of the evaporation system are reduced, and the water of the water return tank is used for circulating make-up water, thereby reducing the discharge of circulating water and achieving the purpose of saving water. The salt separation crystallization water saving system that this embodiment provided adds the device through setting up agitating unit and alkali lye in the sedimentation tank, and the alkali lye adds the device and is used for throwing lime and sodium carbonate solution in to the cell body, and agitating unit is used for stirring waste water and the lime and the sodium carbonate solution of interpolation in the cell body, and calcium magnesium gets rid of the reaction with higher speed for the reaction is more complete, and calcium magnesium gets rid of the effect better. The diapire through with the cell body sets up to the back taper structure, and the top of back taper diapire sets up the discharge gate, through setting up the discharge gate at the least significant end of back taper diapire for solid particle impurity and the slope gathering along the diapire of calcium magnesium in-process production are convenient for discharge, the row clean in the bottom of cell body in the waste water.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A salt separation crystallization water saving system for treating circulating sewage, which is characterized by comprising a sedimentation tank (1), wherein the sedimentation tank (1) is configured to contain sewage and is used as a place for removing calcium and magnesium ions in the sewage;
the sedimentation tank (1) comprises a tank body (1-1), the tank body (1-1) is provided with a top wall, a bottom wall and side walls, and the top wall of the tank body (1-1) is provided with a stirring device and an alkali liquor adding device (1-5); the bottom wall of the tank body (1-1) is of an inverted cone structure, and the top end of the inverted cone bottom wall is provided with a discharge hole (1-6); the side wall of the tank body (1-1) is provided with a sewage inlet pipe (1-7), a water outlet pipe (1-10) and a concentrated water return pipe (1-8).
2. The salt separation and crystallization water saving system for treating the circulating sewage according to claim 1, wherein the stirring device comprises a stirring motor (1-2), the stirring motor (1-2) is connected with a stirring shaft, and the end part of the stirring shaft is provided with a V-shaped stirring blade (1-4).
3. The salt separation and crystallization water saving system for treating the circulating sewage according to claim 2, wherein the curved surface swept by the outer contour of the V-shaped stirring blades (1-4) is parallel to the curved surface of the inner wall of the inverted cone-shaped bottom wall.
4. The salt separation crystallization water saving system for treating the circulating sewage according to claim 2, characterized in that a stirring frame (1-3) is arranged on a stirring shaft of the stirring motor (1-2), and the stirring frame (1-3) is formed by splicing a plurality of rectangular frames.
5. The salt separation crystallization water saving system for treating the circulating sewage according to the claim 1, characterized by further comprising an ultrafiltration membrane device (2), wherein the water inlet of the ultrafiltration membrane device (2) is connected with the water outlet pipe (1-10) of the sedimentation tank (1) for removing suspended matters in the wastewater fed by the sedimentation tank (1);
a water inlet of the first water production tank (3) is connected with a water production port of the ultrafiltration membrane device (2);
the continuous nanofiltration membrane device (4) is used for separating a divalent salt solution; a water inlet of the continuous nanofiltration membrane device (4) is communicated with a water outlet of the first water production tank (3);
a water inlet of the second water production tank (5) is connected with a water production port of the continuous nanofiltration membrane device (4);
a first water inlet of the reverse osmosis membrane device (6) is connected with a water outlet of the second water production tank (5);
a water inlet of the third water production tank (7) is connected with a concentrated water outlet of the reverse osmosis membrane device (6);
an evaporative crystallization system (8), a water inlet of the evaporative crystallization system (8) is connected with a water outlet of the third water production tank (7),
a water return tank (9), the water inlet of the water return tank (9) with the water producing port of the evaporative crystallization system (8) is connected, the water outlet of the water return tank (9) is connected with the second water inlet of the reverse osmosis membrane device (6).
6. The salt separation crystallization water saving system for treating the circulating sewage according to the claim 5, characterized in that the water outlet pipe (1-10) is installed on the side wall of the tank body (1-1) through a coarse filter member (1-9), and the coarse filter member (1-9) is detachably connected with the side wall of the tank body (1-1).
7. The salt separation and crystallization water saving system for treating the circulating sewage according to claim 5, wherein a concentrated water outlet of the continuous nanofiltration membrane device (4) is connected with the sedimentation tank (1) through the concentrated water return pipe (1-8) so as to make the concentrated water generated by the continuous nanofiltration membrane device (4) return to the sedimentation tank (1).
8. The system for saving salt separation and crystallization for treating recycled sewage according to any one of claims 5 to 7, further comprising a crystallized salt drying system for collecting salt separated by the centrifuge (8-6).
9. The salt separation and crystallization water saving system for treating the circulating sewage according to claim 8, wherein the continuous nanofiltration membrane device (4) comprises: first high-pressure pump (4-1), first nanofiltration membrane (4-2), second high-pressure pump (4-3) and second nanofiltration membrane (4-4) that connect gradually, first product water tank (3) with first high-pressure pump (4-1) are connected, first nanofiltration membrane (4-2) with second nanofiltration membrane (4-4) all with second product water tank (5) are connected, second nanofiltration membrane (4-4) with sedimentation tank (1) are connected.
10. The salt separation crystallization water saving system for treating the circulating sewage according to claim 5, wherein the evaporative crystallization system (8) comprises: a heat exchanger (8-1), a heater (8-2), a crystallizer (8-3), a vapor compressor (8-4), a circulating pump (8-5) and a centrifuge (8-6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121791493.7U CN214270585U (en) | 2021-08-03 | 2021-08-03 | Salt separation crystallization water-saving system for treating circulating sewage |
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| CN202121791493.7U CN214270585U (en) | 2021-08-03 | 2021-08-03 | Salt separation crystallization water-saving system for treating circulating sewage |
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2021
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