CN115448407A - High-salinity wastewater treatment device and method based on freezing crystallization - Google Patents
High-salinity wastewater treatment device and method based on freezing crystallization Download PDFInfo
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- CN115448407A CN115448407A CN202211318622.XA CN202211318622A CN115448407A CN 115448407 A CN115448407 A CN 115448407A CN 202211318622 A CN202211318622 A CN 202211318622A CN 115448407 A CN115448407 A CN 115448407A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 21
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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
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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- Hydrology & Water Resources (AREA)
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- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a high-salinity wastewater treatment device based on freezing crystallization, which comprises a separation assembly, a separation assembly and a freezing crystallization barrel, wherein the freezing crystallization barrel is fixed in the separation tank; the high-salt wastewater piece is arranged outside the separation tank, the liquid outlet end of the high-salt wastewater piece is communicated with the liquid inlet end at the bottom of the separation tank, and the liquid inlet end of the high-salt wastewater piece is communicated with the liquid outlet end at the top of the separation tank. The invention can realize high-efficiency low-cost desalination treatment and salt recovery of high-salt wastewater, pre-cools the high-salt wastewater to be treated by using ice crystal melting, and reduces the energy consumption of the system. Has the advantages of simple and compact structure, low energy consumption, less pollution, low corrosion and less scaling.
Description
Technical Field
The invention relates to the technical field of high-concentration salt-containing wastewater treatment, in particular to a high-salt wastewater treatment device and method based on freezing crystallization.
Background
The high-salinity wastewater refers to industrial wastewater with the Total Dissolved Solids (TDS) mass fraction of more than 1.0%, currently, membrane methods and thermal methods are mainly adopted for treating the high-salinity industrial wastewater at home and abroad, but aiming at high-salinity high-concentration organic wastewater, the problems of serious membrane pollution, high energy consumption, equipment corrosion and the like frequently occur in the membrane method, and the high-salinity wastewater is generally difficult to be directly treated by the biological method.
Based on the principle of removing impurities in the freezing and crystallizing process of water molecules, the specific gravity difference of salt, water and ice and the crystallization temperature difference of different salts, the method applies freezing, crystallizing, centrifuging and other methods to remove organic matters and salt in wastewater, separates and purifies inorganic salt, and provides a new solution for the treatment and recycling of high-salt high-concentration organic wastewater. The freezing method is based on the principle that impurities are removed in the process of freezing and crystallizing water molecules, so that relatively pure ice and concentrated solution are obtained through separation, when waste water containing soluble pollutants is gradually frozen, ice crystals only grow from pure water, and the pollutants are discharged into a liquid phase, so that the pollutants are separated from water. The freezing method is a physical separation method, and the latent heat of vaporization of water under normal pressure is up to 2256 kJ.kg -1 333 kJ.kg of latent heat of fusion of ice -1 About 7 times higher, so compared to the thermal method, the refrigeration method theoretically requires less energy. And the freezing method is carried out at low temperature, so that the corrosion and scaling of equipment can be reduced, and the freezing method has the advantages of low energy consumption, less pollution, low corrosion and less scaling.
Therefore, the high-salinity wastewater treatment device and method based on the freezing crystallization can realize the separation, purification and recovery of soluble salt substances from wastewater and achieve the effective treatment target of the high-salinity wastewater.
Disclosure of Invention
The invention aims to provide a high-salinity wastewater treatment device and method based on freezing crystallization, which are used for solving the problems in the prior art. Has the advantages of simple and compact structure, low energy consumption, less pollution, low corrosion and less scaling.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a high-salinity wastewater treatment device based on freezing crystallization, which comprises,
the separation assembly comprises a separation tank and a freezing crystallization barrel fixed in the separation tank, wherein a scraping lifting piece is sleeved outside the freezing crystallization barrel and is rotatably connected with the separation tank through a driving piece, the scraping end of the scraping lifting piece is in contact with the outer wall of the freezing crystallization barrel, and the liquid inlet end at the bottom of the scraping lifting piece is communicated with the inside of the separation tank;
the high-salt wastewater piece is arranged outside the separation tank, the liquid outlet end of the high-salt wastewater piece is communicated with the liquid inlet end at the bottom of the separation tank, and the liquid inlet end of the high-salt wastewater piece is communicated with the liquid outlet end at the top of the separation tank;
the ice crystal collecting piece is arranged in the high-salt wastewater piece, the top discharge end of the scraping lifting piece is communicated with the ice crystal collecting piece, and the top discharge end of the scraping lifting piece is positioned above the top liquid outlet end of the separation tank;
and the crystalline salt collecting piece is arranged at the bottom end of the separation tank, and the discharge end at the bottom end of the separation tank is communicated with the crystalline salt collecting piece.
Preferably, the freezing crystallization barrel comprises a barrel body, the bottom end of the barrel body is fixedly connected with the inner wall of the separation tank through a support rod, a backflow barrel is fixedly connected in the barrel body, a backflow port is formed in the top of the backflow barrel, the inner wall of the barrel body and the outer wall of the backflow barrel are communicated with the inside of the backflow barrel through the backflow port, a refrigerator is arranged outside the separation tank, the refrigerant output end of the refrigerator is communicated with the inner wall of the barrel body and the outer wall of the backflow barrel through an output pipe, and the bottom end of the backflow barrel is communicated with the refrigerant input end of the refrigerator through an input pipe.
Preferably, strike off promotion piece including the cover establish strike off a section of thick bamboo outside the barrel, strike off a section of thick bamboo bottom opening, it has the spiral to promote the scraper to strike off a section of thick bamboo inner wall rigid coupling, the spiral promote the scraper with barrel outer wall contact, strike off a section of thick bamboo lateral wall top and seted up the bin outlet, separation tank top inner wall rigid coupling has the fixed section of thick bamboo of bottom shutoff, fixed cylinder cover is established strike off outside the section of thick bamboo, strike off a section of thick bamboo outer wall with fixed section of thick bamboo rotates to be connected, the discharge gate has been seted up to fixed section of thick bamboo lateral wall, the discharge gate with ice crystal collection piece intercommunication.
Preferably, the outer wall of the scraping barrel is fixedly connected with a rotary scraper, the rotary scraper is in contact with the inner wall of the separation tank, and the rotary scraper is positioned below the liquid outlet end at the top of the separation tank.
Preferably, the driving piece comprises a driving motor fixedly connected with the outer wall of the top end of the separation tank, the output end of the driving motor is fixedly connected with a speed reducer, and the output end of the speed reducer is fixedly connected with the top end of the scraping cylinder.
Preferably, the high-salinity wastewater piece comprises a high-salinity wastewater tank, the high-salinity wastewater tank is communicated with the bottom of the separation tank through a liquid inlet pipe, the top of the separation tank is communicated with a liquid outlet pipe, and the liquid outlet end of the liquid outlet pipe is communicated with the high-salinity wastewater tank.
Preferably, the ice crystal collecting piece is including fixing the ice crystal collecting vat in the high salt waste water tank, the rigid coupling has the ice crystal guiding gutter on the discharge gate, the ice crystal guiding gutter is located the drain pipe top, just the ice crystal guiding gutter discharge end with the ice crystal collecting vat intercommunication.
Preferably, the crystallized salt collecting piece comprises a screw conveyor communicated with the bottom end of the separating tank, and the discharge end of the screw conveyor is communicated with a crystallized salt collecting tank.
Preferably, the separation tank comprises a cylinder and a cone fixed at the bottom end of the cylinder, the height-diameter ratio of the cylinder is 1-1.5, and the cone angle of the cone is 55-60 degrees.
The application method of the high-salinity wastewater treatment device based on freezing crystallization comprises the following operation steps,
the starting device comprises: opening a freezing crystallization barrel, and inputting high-salinity wastewater into a separation tank;
extracting ice crystals: starting the driving piece, scraping the ice crystals on the outer wall of the freezing crystallization barrel by the scraping lifting piece, and conveying the ice crystals to the ice crystal collecting piece;
extracting crystalline salt: starting a crystallized salt collecting piece, wherein the crystallized salt collecting piece collects crystallized salt at the bottom of the separation tank;
high-salinity wastewater backflow: and continuously inputting high-salinity wastewater into the separation tank, and refluxing redundant high-salinity wastewater into the high-salinity wastewater part from the top of the separation tank.
The invention discloses the following technical effects:
1. based on the principle of removing impurities in the water molecule freezing and crystallizing process, pure water in the high-salinity wastewater is continuously separated out in the form of ice crystals through freezing action, the high-salinity wastewater is concentrated until salt crystals are separated out, and the low-cost desalination and salt recovery treatment targets of the high-salinity wastewater are realized.
2. The separating tank, the freezing crystallization barrel, the scraping lifting piece, the driving piece and the crystallized salt collecting piece are integrated, so that the occupied area is reduced, and the manufacturing cost of the device is reduced;
3. strike off the lifting piece and not only can strike off the lifting and derive the ice crystal of freezing crystallization bucket outer wall, simultaneously, strike off the motion of lifting piece and can play the effect of stirring the high salt waste water in the knockout drum, the heat exchange and the ice crystal of high salt waste water and freezing crystallization bucket outer wall generate with higher speed.
4. Collect the piece setting with the ice crystal in high salt waste water spare, the ice crystal heat absorption in the ice crystal collection piece melts, can carry out preliminary cooling to the high salt waste water in the high salt waste water spare, can make the high salt waste water temperature in the knockout drum low on the one hand, does benefit to the separation of ice crystal, the energy saving simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a high-salinity wastewater treatment plant;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a schematic structural view of the connection relationship between the refrigerator and the cylinder;
FIG. 4 is a perspective view of the scraper cylinder in relation to the stationary cylinder;
FIG. 5 is a schematic illustration of a high salinity effluent tank in positional relationship to an ice crystal collection tank;
the device comprises a separation tank 1, a cylinder 2, a support rod 3, a reflux cylinder 4, a reflux port 5, a refrigerator 6, a scraping cylinder 7, a spiral lifting scraper 8, a discharge port 9, a fixed cylinder 10, a discharge port 11, a rotary scraper 12, a driving motor 13, a speed reducer 14, a high-salt wastewater tank 15, a liquid inlet pipe 16, a liquid outlet pipe 17, an ice crystal collecting tank 18, an ice crystal diversion tank 19, a spiral conveyor 20, a crystal salt collecting tank 21, an output pipe 22, an input pipe 23 and a high-salt wastewater pump 24.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Referring to fig. 1-5, the invention provides a high-salinity wastewater treatment device based on freezing crystallization, which comprises a separation assembly, a separation assembly and a freezing crystallization barrel, wherein the separation assembly comprises a separation tank 1 and the freezing crystallization barrel fixed in the separation tank 1, a scraping lifting piece is sleeved outside the freezing crystallization barrel and is rotationally connected with the separation tank 1 through a driving piece, a scraping end of the scraping lifting piece is in contact with the outer wall of the freezing crystallization barrel, and a liquid inlet end at the bottom of the scraping lifting piece is communicated with the inside of the separation tank 1; the high-salt wastewater piece is arranged outside the separation tank 1, the liquid outlet end of the high-salt wastewater piece is communicated with the liquid inlet end at the bottom of the separation tank 1, and the liquid inlet end of the high-salt wastewater piece is communicated with the liquid outlet end at the top of the separation tank 1; the ice crystal collecting piece is arranged in the high-salinity wastewater piece, the top discharge end of the scraping lifting piece is communicated with the ice crystal collecting piece, and the top discharge end of the scraping lifting piece is positioned above the top liquid outlet end of the separation tank 1; the crystallized salt collecting piece is arranged at the bottom end of the separation tank 1, and the discharge end at the bottom end of the separation tank 1 is communicated with the crystallized salt collecting piece.
The storage has high salt waste water in high salt waste water spare, let in high salt waste water in the knockout drum 1, high salt waste water in the knockout drum 1 gets into strikes off in the promotion piece, freezing ice crystal section of thick bamboo outer wall refrigeration simultaneously, the ice crystal is attached to on freezing ice crystal section of thick bamboo outer wall, and strike off the promotion to the ice crystal through striking off the promotion piece, finally strike off in promotion piece top output to ice crystal collection piece, in this process, the crystal salt in the knockout drum 1 descends to knockout drum 1 bottom under the action of gravity, collect a output knockout drum 1 through the crystal salt, and continuously let in high salt waste water to knockout drum 1, partial high salt waste water is through 1 top overflow of knockout drum and flow back to in the high salt waste water spare, and simultaneously, the ice crystal in the ice crystal collection piece is to the high salt waste water cooling in the high salt waste water spare.
Wherein, strike off the discharge end that promotes the piece and need set up in knockout drum 1 top play liquid end top to avoid the ice crystal of deriving to contact again with the high salt waste water in the knockout drum 1.
Furthermore, the outer wall of the separation tank 1 is fixedly connected with a heat-insulating layer (not shown in the figure), and the heat-insulating layer is used for insulating the interior of the separation tank 1.
Further optimize the scheme, freezing crystallization bucket includes a barrel 2, bracing piece 3 and 1 inner wall rigid coupling of knockout drum are passed through to 2 bottoms of barrel, the rigid coupling has a backward flow section of thick bamboo 4 in the barrel 2, backward flow mouth 5 has been seted up at 4 tops of a backward flow section of thick bamboo, communicate in 5 and the backward flow section of thick bamboo 4 through backward flow mouth between 2 inner walls of barrel and the 4 outer walls of a backward flow section of thick bamboo, 1 is provided with refrigerator 6 outward of knockout drum, the refrigerant output of refrigerator 6 passes through output tube 22 and communicates between 2 inner walls of barrel and the 4 outer walls of a backward flow section of thick bamboo, the refrigerant input intercommunication of 23 and refrigerator 6 is passed through to the 4 bottoms of a backward flow section of thick bamboo.
The refrigerator 6 outputs the refrigerant, the refrigerant enters between the inner wall of the cylinder body 2 and the outer wall of the backflow cylinder 4 through the output pipe 22 and moves upwards, heat exchange is carried out on the outer wall of the cylinder body 2 in the process, the low temperature of the outer wall of the cylinder body 2 is guaranteed, when the refrigerant moves to the position of the backflow port 5, the refrigerant enters the backflow cylinder 4 through the backflow port 5 and rapidly falls into the input pipe 23, and then returns to the refrigerator 6 to be re-refrigerated. This kind of setting reduces the heat transfer of the refrigerant in the backward flow section of thick bamboo 4 and the refrigerant between 2 inner walls of barrel and the 4 outer walls of a backward flow section of thick bamboo, can effectively guarantee the heat transfer of the refrigerant between 2 inner walls of barrel and the 4 outer walls of a backward flow section of thick bamboo and 2 outer walls of barrel.
Specifically, the refrigerator 6 is used for refrigerating, outputs a refrigerant and ensures that the temperature of the outer wall of the cylinder body 2 is between minus 7 ℃ and minus 20 ℃ so as to ensure the normal condensation of ice crystals.
Further optimization scheme, strike off the promotion piece and establish a section of thick bamboo 7 that strikes off outside barrel 2 including the cover, strike off 7 bottom openings in a section of thick bamboo, strike off 7 inner wall rigid couplings in a section of thick bamboo and have spiral promotion scraper 8, spiral promotion scraper 8 and 2 outer wall contacts of barrel, strike off 7 lateral wall tops in a section of thick bamboo and seted up bin outlet 9, 1 top inner wall rigid couplings in knockout drum have the solid fixed cylinder 10 of bottom shutoff, gu fixed cylinder 10 cover is established outside striking off a section of thick bamboo 7, strike off 7 outer walls in a section of thick bamboo and solid fixed cylinder 10 and rotate to be connected, gu fixed cylinder 10 lateral wall has seted up discharge gate 11, discharge gate 11 and ice crystal collecting member intercommunication.
Strike off a 7 covers and establish outside barrel 2, when it is used for fixed spiral to promote scraper 8, guarantee to strike off by 2 outer walls of barrel and fall to the ice crystal on spiral promotes scraper 8 and can not disperse to knockout drum 1 in, the ice crystal of striking off only can promote along fixed spiral, and derive by bin outlet 9, owing to strike off a 7 and be in the rotating condition, in order to effectively collect the ice crystal of bin outlet 9 derivation, establish fixed section of thick bamboo 10 at 7 overcoat of striking off a section of thick bamboo, the top of a 7 is struck off in the cladding of fixed section of thick bamboo 10, fall to fixed section of thick bamboo 10 in by the ice crystal of bin outlet 9 derivation, and finally in the leading-in ice crystal collection piece of discharge gate 11 on the fixed section of thick bamboo 10.
Furthermore, the height of the inner wall of the bottom end of the fixed cylinder 10 close to one side of the discharge port 11 is lower than the height of the inner wall of the bottom end of the fixed cylinder far away from one side of the discharge port 11, namely, the inner wall of the bottom end of the fixed cylinder 10 inclines towards the direction of the discharge port 11, and under the arrangement, the ice crystals discharged from the discharge port 9 can be guided, so that the ice crystals are easily discharged from the discharge port 11.
According to the further optimized scheme, a rotary scraper 12 is fixedly connected to the outer wall of the scraping barrel 7, the rotary scraper 12 is in contact with the inner wall of the separation tank 1, and the rotary scraper 12 is located below the liquid outlet end at the top of the separation tank 1. When handling high salt waste water, part crystallization salt subsides under the action of gravity, part crystallization salt adhesion forms the salt dirt on the inner wall of knockout drum 1, and strike off a fixed rotatory scraper 12 of 7 outer walls, under the driving piece effect, rotatory scraper 12 can be followed and strike off a rotation of 7 and strike off the salt dirt of 1 inner walls of knockout drum, the operating time of processing apparatus is improved, simultaneously, the rotation of rotatory scraper 12 can further stir the high salt waste water in the knockout drum 1, the heat exchange of high salt waste water and freezing crystallization bucket outer wall and the formation of ice crystal are quickened.
Wherein the presence of the support bar 3 does not affect the normal rotation of the rotary blade 12.
Further optimize the scheme, the driving piece includes the driving motor 13 with the outer wall rigid coupling of knockout drum 1 top, and driving motor 13 output rigid coupling has reduction gear 14, and the output of reduction gear 14 strikes off a section of thick bamboo 7 top rigid coupling with scraping. A driving motor 13 and a speed reducer 14 are fixed at the top end of the separation tank 1 through a bracket, and the driving motor 13 is used for providing power for the scraping cylinder 7 to rotate.
In one embodiment of the invention, the top end of the scraping cylinder 7 is closed and extends out of the separating tank 1, and the output end of the speed reducer 14 is directly connected with the top end of the scraping cylinder 7.
In another embodiment of the present invention, the top end of the scraping cylinder 7 is closed and located in the separation tank 1, and the output end of the reducer 14 penetrates through the top end of the separation tank 1 and is connected with the top end of the scraping cylinder 7.
Further optimization scheme, high salt waste water spare includes high salt waste water groove 15, and high salt waste water groove 15 passes through feed liquor pipe 16 and 1 bottom intercommunication of knockout drum, and 1 top intercommunication of knockout drum has drain pipe 17, and drain pipe 17 goes out the liquid end and 15 intercommunications of high salt waste water groove. The high-salt wastewater tank 15 is used for containing high-salt wastewater, the high-salt wastewater is introduced into the separation tank 1 through the liquid inlet pipe 16, the high-salt wastewater moves upwards in the separation tank 1, separated ice crystals enter the ice crystal collecting piece under the action of the spiral lifting scraper 8 in the moving process, crystallized salt falls under the action of gravity and enters the crystallized salt collecting piece, and the residual high-salt wastewater flows back into the high-salt wastewater tank 15 through the liquid outlet pipe 17 and participates in circulation treatment again.
Specifically, the liquid inlet pipe 16 is provided with a high-salinity wastewater pump 24, and the high-salinity wastewater pump 24 is used for providing power to input high-salinity wastewater in the high-salinity wastewater tank 15 into the separation tank 1.
Further optimize the scheme, ice crystal collection piece is including fixing the ice crystal collecting vat 18 in high salt effluent disposal basin 15, and the rigid coupling has ice crystal guiding gutter 19 on the discharge gate 11, and ice crystal guiding gutter 19 is located drain pipe 17 top, and 19 discharge ends of ice crystal guiding gutter and ice crystal collecting vat 18 intercommunication. The ice crystal collecting tank 18 is arranged in the high-salt wastewater tank 15, and the ice crystal collecting tank 18 preferably adopts a material with a good heat conduction effect so as to realize effective heat exchange between the ice crystal and the high-salt wastewater. Meanwhile, because the ice crystal diversion trench 19 is positioned above the liquid outlet pipe 17, ice crystals in the ice crystal diversion trench 19 cannot contact with the high-salinity wastewater in the separation tank 1.
Further, the high-salinity wastewater tank 15 and the ice crystal collecting tank 18 are concentric circular water tanks or square water tanks, and the ice crystal collecting tank 18 is located in the middle of the high-salinity wastewater tank 15, so that the energy-saving effect of pre-cooling high-salinity wastewater by melting ice crystals is achieved.
In a further optimized scheme, the crystallized salt collecting piece comprises a screw conveyor 20 communicated with the bottom end of the separating tank 1, and the discharge end of the screw conveyor 20 is communicated with a crystallized salt collecting tank 21. The screw conveyor 20 is used for outputting the crystallized salt at the bottom of the knockout drum 1 and guiding the crystallized salt into a crystallized salt collecting tank 21 for storage.
According to a further optimized scheme, the separation tank 1 comprises a cylinder and a cone fixed at the bottom end of the cylinder, the height-diameter ratio of the cylinder is 1-1.5, and the cone angle of the cone is 55-60 degrees. The bottom of the separating tank 1 is in a cone structure, which facilitates the falling and collection of the crystallized salt.
Further, barrel 2 is preferred to be set up on the axis of knockout drum 1, and the diameter of barrel 2 is 1/4 ~ 1/3 of the 1 cylinder diameter of knockout drum, and barrel 2 bottom is preferred and the cylinder bottom parallel and level of knockout drum 1, and the 2 top of barrel surpasss the cylinder top 0.5m ~ 1m of knockout drum 1, and simultaneously, there is the closing cap cylinder top, and the closing cap is used for holding barrel 2 to make the upper and lower port of knockout drum 1 seal.
The scheme for further optimizing the use of the high-salinity wastewater treatment device based on freezing crystallization comprises the following operation steps,
the starting device comprises: the freezing and crystallizing barrel is opened, and high-salinity wastewater is input into the separation tank 1. Starting the high-salinity wastewater pump 24 and the refrigerator 6, conveying a refrigerant between the cylinder body 2 and the backflow cylinder 4 by the refrigerator 6 to keep the outer wall of the cylinder body 2 at a low temperature, and pumping the high-salinity wastewater in the high-salinity wastewater tank 15 into the separation tank 1 by the high-salinity wastewater pump 24 to separate ice crystals and simultaneously settle crystallized salt.
Extracting ice crystals: and starting the driving piece, scraping the lifting piece to scrape the ice crystals on the outer wall of the freezing crystallization barrel and conveying the ice crystals to the ice crystal collecting piece. The driving motor 13 works to drive the scraping barrel 7 and the rotary scraper 12 to rotate, the scraping barrel 7 drives the spiral lifting scraper 8 fixed on the inner wall of the scraping barrel to rotate, ice crystals on the outer wall of the barrel body 2 are scraped and lifted into the fixed barrel 10, and the ice crystals in the fixed barrel 10 are guided into the ice crystal collecting tank 18 through the ice crystal guide groove 19.
Extracting crystal salt: the crystallized salt collecting member is started and collects the crystallized salt at the bottom of the separation tank 1. The screw conveyor 20 works to output the crystallized salt at the bottom of the knockout drum 1 to the crystallized salt collecting tank 21.
High-salinity wastewater backflow: high-salinity wastewater is continuously input into the separation tank 1, and the high-salinity wastewater which cannot be treated in time flows back into the high-salinity wastewater component from the top of the separation tank 1. The high-salinity wastewater in the separation tank 1 is continuously fed and moves upward, and after the high-salinity wastewater moves to a certain position, the high-salinity wastewater is guided into the high-salinity wastewater tank 15 through the liquid outlet pipe 17.
In the process, pure water in the high-salinity wastewater is continuously separated out in an ice crystal form through the freezing action, and the high-salinity wastewater is concentrated until salt is crystallized and separated out, so that the low-cost desalination and salt recovery treatment targets of the high-salinity wastewater are realized; the separation of the ice crystals, the crystallized salt and water can be synchronously realized by adopting spiral conveying of the ice crystals and the crystallized salt, a centrifugal dehydration device is omitted, and the energy consumption and the cost are reduced; the rotation of the spiral lifting scraper 8 and the rotary scraper 12 can also play a role in stirring the high-salinity wastewater in the separation tank 1, so that the heat exchange between the high-salinity wastewater and the outer wall of the freezing crystallization barrel and the generation of ice crystals are accelerated.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. High salt effluent treatment plant based on freezing crystallization, its characterized in that: comprises the steps of (a) preparing a substrate,
the separation assembly comprises a separation tank (1) and a freezing crystallization barrel fixed in the separation tank (1), wherein a scraping lifting piece is sleeved outside the freezing crystallization barrel and is rotatably connected with the separation tank (1) through a driving piece, the scraping end of the scraping lifting piece is in contact with the outer wall of the freezing crystallization barrel, and the liquid inlet end at the bottom of the scraping lifting piece is communicated with the separation tank (1);
the high-salt wastewater piece is arranged outside the separation tank (1), the liquid outlet end of the high-salt wastewater piece is communicated with the liquid inlet end at the bottom of the separation tank (1), and the liquid inlet end of the high-salt wastewater piece is communicated with the liquid outlet end at the top of the separation tank (1);
the ice crystal collecting piece is arranged in the high-salinity wastewater piece, the top discharging end of the scraping lifting piece is communicated with the ice crystal collecting piece, and the top discharging end of the scraping lifting piece is positioned above the top liquid outlet end of the separation tank (1);
the crystallized salt collecting piece is arranged at the bottom end of the separating tank (1), and the discharge end at the bottom end of the separating tank (1) is communicated with the crystallized salt collecting piece.
2. The high salinity wastewater treatment plant based on freezing crystallization of claim 1, characterized in that: the freezing crystallization barrel comprises a barrel body (2), the bottom end of the barrel body (2) is fixedly connected with the inner wall of the separation tank (1) through a support rod (3), a backflow barrel (4) is fixedly connected into the barrel body (2), a backflow port (5) is formed in the top of the backflow barrel (4), the inner wall of the barrel body (2) is communicated with the outer wall of the backflow barrel (4) through the backflow port (5), the backflow barrel (4) is communicated with the inside of the separation tank (1), a refrigerator (6) is arranged outside the separation tank (1), the refrigerant output end of the refrigerator (6) is communicated with the inner wall of the barrel body (2) and the outer wall of the backflow barrel (4) through an output pipe (22), and the bottom end of the backflow barrel (4) is communicated with the refrigerant input end of the refrigerator (6) through an input pipe (23).
3. The high salinity wastewater treatment plant based on frozen crystallization of claim 2, characterized in that: strike off lifting member and establish including the cover strike off a section of thick bamboo (7) outside barrel (2), strike off a section of thick bamboo (7) bottom opening, strike off a section of thick bamboo (7) inner wall rigid coupling and have spiral lifting scraper (8), spiral lifting scraper (8) with barrel (2) outer wall contact, strike off a section of thick bamboo (7) lateral wall top and seted up bin outlet (9), knockout drum (1) top inner wall rigid coupling has a solid fixed cylinder (10) of bottom shutoff, gu fixed cylinder (10) cover is established strike off a section of thick bamboo (7) outward, strike off a section of thick bamboo (7) outer wall with gu fixed cylinder (10) rotate and connect, gu fixed cylinder (10) lateral wall has seted up discharge gate (11), discharge gate (11) with ice crystal collection piece intercommunication.
4. The high salinity wastewater treatment plant based on freezing crystallization of claim 3, characterized in that: the outer wall of the scraping barrel (7) is fixedly connected with a rotary scraper (12), the rotary scraper (12) is in contact with the inner wall of the separation tank (1), and the rotary scraper (12) is located below the liquid outlet end at the top of the separation tank (1).
5. The high salinity wastewater treatment plant based on frozen crystallization of claim 3, characterized in that: the driving piece comprises a driving motor (13) fixedly connected with the outer wall of the top end of the separating tank (1), a speed reducer (14) is fixedly connected with the output end of the driving motor (13), and the output end of the speed reducer (14) is fixedly connected with the top end of the scraping cylinder (7).
6. The high salinity wastewater treatment plant based on freezing crystallization of claim 3, characterized in that: the high-salinity wastewater piece comprises a high-salinity wastewater groove (15), the high-salinity wastewater groove (15) is communicated with the bottom of the separation tank (1) through a liquid inlet pipe (16), the top of the separation tank (1) is communicated with a liquid outlet pipe (17), and the liquid outlet end of the liquid outlet pipe (17) is communicated with the high-salinity wastewater groove (15).
7. The high salinity wastewater treatment plant based on frozen crystallization of claim 6, characterized in that: ice crystal collection piece is including fixing ice crystal collecting vat (18) in high salt waste water groove (15), the rigid coupling has ice crystal guiding gutter (19) on discharge gate (11), ice crystal guiding gutter (19) are located drain pipe (17) top, just ice crystal guiding gutter (19) discharge end with ice crystal collecting vat (18) intercommunication.
8. The high salinity wastewater treatment plant based on freezing crystallization of claim 1, characterized in that: the crystallized salt collecting piece comprises a screw conveyor (20) communicated with the bottom end of the separating tank (1), and a crystallized salt collecting tank (21) is communicated with the discharge end of the screw conveyor (20).
9. The high salinity wastewater treatment apparatus based on freezing crystallization of claim 1, characterized in that: the separation tank (1) comprises a cylinder and a cone fixed at the bottom end of the cylinder, the height-diameter ratio of the cylinder is 1-1.5, and the cone angle of the cone is 55-60 degrees.
10. The method for using a high-salinity wastewater treatment device based on freezing crystallization according to claim 1, which is characterized in that: the operation steps comprise that,
starting a device: opening a freezing crystallization barrel, and inputting high-salinity wastewater into the separation tank (1);
extracting ice crystals: starting the driving piece, scraping the ice crystals on the outer wall of the freezing crystallization barrel by the scraping lifting piece, and conveying the ice crystals to the ice crystal collecting piece;
extracting crystal salt: starting a crystalline salt collecting piece, wherein the crystalline salt collecting piece collects the crystalline salt at the bottom of the separating tank (1);
high-salinity wastewater backflow: high-salinity wastewater is continuously input into the separation tank (1), and redundant high-salinity wastewater flows back into the high-salinity wastewater piece from the top of the separation tank (1).
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