CN214088113U - Landfill leachate's processing and separation extraction element of its salt - Google Patents
Landfill leachate's processing and separation extraction element of its salt Download PDFInfo
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- CN214088113U CN214088113U CN202022961465.7U CN202022961465U CN214088113U CN 214088113 U CN214088113 U CN 214088113U CN 202022961465 U CN202022961465 U CN 202022961465U CN 214088113 U CN214088113 U CN 214088113U
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Abstract
The utility model relates to a technical field that landfill leachate handled, more specifically say, it relates to a landfill leachate's processing and its salt's separation extraction element, the device includes chemical precipitation unit, membrane filtration unit, chemical oxidation unit, evaporation crystallization divides salt unit and deep processing unit, not only can effectively get rid of more calcium ion of content, organic matter and heavy metal ion in the industry landfill leachate through above-mentioned device, has still solved the difficult problem that inorganic salt is difficult to retrieve in the industry landfill leachate, has realized landfill leachate's resourceful treatment.
Description
Technical Field
The utility model relates to a technical field that landfill leachate handled, more specifically say, it relates to a landfill leachate's processing and its salt's separation extraction element.
Background
In recent years, the industrialization process of China is rapidly developed, and the industrial solid waste landfill requirement is more and more large. The research in the aspect of industrial landfill leachate treatment is relatively late in China and relatively low in starting, and the landfill leachate has the characteristics of high inorganic salt content, poor biodegradability, complex components and the like and is extremely difficult to treat.
At present, industrial landfill leachate is mainly treated by a 'coagulating sedimentation-biochemical-RO membrane filtration' process, but concentrated water filtered by an RO membrane contains a large amount of inorganic salt, the inorganic salt is refilled or refilled into a landfill in the form of miscellaneous salt, and the inorganic salt returns to the industrial landfill leachate after being leached and washed by rainwater, so that salt in the landfill leachate is continuously accumulated, a biochemical system and an RO membrane filtration system are influenced, and the system is unstable and finally collapses. Inorganic salt in the industrial landfill leachate is not discharged, which becomes an industrial and worldwide problem, not only harms the landfill safety of a landfill, but also influences the stability of a leachate treatment system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to the deficiencies in the prior art exist, the utility model aims to provide a landfill leachate's processing and its salt's separation extraction element, separation extraction element includes chemical precipitation unit, membrane filtration unit, chemical oxidation unit, evaporation crystallization divides salt unit and deep-processing unit, not only can effectively get rid of the more calcium ion of content in the industry landfill leachate, organic matter and heavy metal ion through above-mentioned equipment, has still solved the difficult problem that inorganic salt is difficult to retrieve in the industry landfill leachate, has realized landfill leachate's resourceful treatment and sodium chloride, the recycle of potassium chloride.
The above technical purpose of the utility model is realized through following technical scheme, a landfill leachate's processing and separation extraction element of its salt, a serial communication port, include: the device comprises a chemical precipitation unit, a membrane filtration unit, a chemical oxidation unit, an evaporation crystallization salt separation unit and a deep treatment unit.
The chemical precipitation unit comprises an adjusting tank, a reaction tank, a precipitation tank, a dosing precipitation group and a centrifugal pump, wherein the adjusting tank, the reaction tank and the precipitation tank are communicated in sequence. The centrifugal pump conveys the garbage percolate subjected to homogenization treatment in the regulating tank to a reaction tank through a pipeline, the number of the reaction tanks is two, the reaction tanks comprise a No. 1 reaction tank and a No. 2 reaction tank, and the dosing sedimentation group comprises a No. 1 dosing sedimentation chamber and a No. 2 dosing sedimentation chamber which are respectively connected with the No. 1 reaction tank and the No. 2 reaction tank. And a proper amount of sodium carbonate is added into the No. 1 reaction tank through the No. 1 dosing sedimentation chamber for reaction, a proper amount of heavy metal capture agent is added into the No. 2 reaction tank through the No. 2 dosing sedimentation chamber for reaction, and the garbage leachate which is settled is generated through standing and settling in the sedimentation tank through reaction.
The membrane filtration unit includes cartridge filter, dish tubular receive filter membrane, still includes booster pump and plunger pump, the dish tubular receive filter membrane includes filtrate inlet, dense water delivery port and product water delivery port, the sedimentation tank cartridge filter the filtrate inlet of dish tubular receive filter membrane is linked together in proper order through the pipeline, the booster pump be used for with supernatant in the sedimentation tank is carried to cartridge filter, the plunger pump be used for with filtration liquid among the cartridge filter is carried to the dish tubular receive filter membrane in, through the filtration of receiving filter membrane, the dense water that does not pass through the receive filter membrane is discharged from dense water delivery port, and the recharge is to landfill, and the product water through receiving filter membrane gets into next processing link through the product water delivery port of receiving filter membrane.
The chemical oxidation unit comprises a chemical adding oxidation chamber and a chemical oxidation pond, the chemical adding oxidation chamber is connected with the chemical oxidation pond, the chemical oxidation pond is connected with a water production outlet of the disc tube type nanofiltration membrane, the chemical adding oxidation chamber is used for adding hydrochloric acid and hypochlorous acid into the chemical oxidation pond in sequence, and when the hydrochloric acid is added in sequence, a pH controller is used for controlling the pH value of the leachate to be 6.
The evaporative crystallization salt separation unit comprises a raw material tank, an evaporator, a No. 1 centrifugal machine, a No. 1 washing machine, a No. 1 eluate collection tank, a crystallization tank, a No. 2 centrifugal machine, a No. 2 washing machine, a No. 2 eluate collection tank, a mother liquor tank and a preheater for preheating the raw materials in the raw material tank, the evaporator comprises a raw material inlet, an eluate inlet, an evaporation outlet and a crystal slurry outlet, the produced water after oxidation in the chemical oxidation pond is conveyed into a raw material tank through a pipeline, the raw material tank is connected with the raw material inlet of the evaporator, the No. 1 centrifugal machine is connected with the crystal slurry outlet of the evaporator, the No. 1 centrifugal machine, the No. 1 washing machine and the No. 1 eluate collecting tank are communicated in sequence, the No. 1 centrifugal machine, the crystallization tank, the No. 2 centrifugal machine, the No. 2 washing machine and the No. 2 eluate collecting tank are communicated in sequence.
In one embodiment, the membrane filtration unit further comprises a membrane washing device for washing the disc-tube type nanofiltration membrane, and the membrane washing device regularly washes the disc-tube type nanofiltration membrane, so that the nanofiltration membrane recovers the membrane flux and the influence on the stability of the membrane filtration system due to the blockage of inorganic salt is avoided.
In one embodiment, the No. 1 eluate collection pool is connected with the evaporator eluate inlet, the No. 2 eluate collection pool is connected with the crystallization tank, and the eluate contains a small amount of sodium chloride and potassium chloride and can be conveyed to the evaporator and the crystallization tank as raw materials for reuse, so that the recovery efficiency of the sodium chloride and the potassium chloride is further increased, and the loss is reduced.
In one embodiment, one side of the mother liquor tank is connected with the No. 2 centrifuge, and the other side of the mother liquor tank is connected with the raw material tank.
In one embodiment, the evaporative crystallization salt separation unit further comprises a condenser and a condensed water tank, wherein one side of the condenser is connected with the condensed water tank, and the other side of the condenser is connected with an evaporation outlet of the evaporator. And the water vapor evaporated by the evaporator is condensed by the condenser and then is conveyed to the condensed water tank.
In one embodiment, the separation and extraction device further comprises a deep treatment unit for treating the condensed water in the condensed water tank.
Above-mentioned landfill leachate's processing and separation extraction element of its salt has following beneficial effect:
firstly, having adopted the dish tubular nanofiltration membrane to divide salt edulcoration, it has stronger selectivity, can permeate monovalent ion, holds back multivalent ion, can effectively get rid of multivalent ions such as calcium ion, magnesium ion, sulfate ion and heavy metal and most macromolecule organic matter in the industrial landfill leachate, and uses the nanofiltration membrane to compare with traditional chemical precipitation method, can not introduce new inorganic salt.
Secondly, organic matters in the leachate can be further oxidized and decomposed by using the oxidizing property of sodium hypochlorite in the chemical oxidation unit, so that the organic matters in the landfill leachate can be efficiently degraded; and simultaneously, a small amount of sodium ions and chloride ions introduced can be recycled in the subsequent evaporative crystallization process.
And thirdly, the eluate stored in the No. 1 eluate collecting tank can be used as a raw material and conveyed to an evaporator for reuse, and the eluate stored in the No. 2 eluate collecting tank can be used as a raw material and conveyed to a crystallization tank for reuse, so that the recovery efficiency of sodium chloride and potassium chloride is further increased, and the loss is reduced.
Fourthly, sodium chloride and potassium chloride which meet the industrial standard are prepared through the step of evaporating, crystallizing and separating salt, the problem that inorganic salt in the industrial landfill leachate does not go out is solved, and the resource treatment of the landfill leachate and the recycling of the salt are realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus for treating landfill leachate in this embodiment;
FIG. 2 is an enlarged view of the disk-tube nanofiltration membrane in the present embodiment;
fig. 3 is an enlarged view of the evaporator in the present embodiment.
In the figure: 1. a regulating tank; 2. a centrifugal pump; 3. a No. 1 reaction tank; 4. no. 1 dosing sedimentation chamber; 5. no. 2 dosing sedimentation chamber; 6. a No. 2 reaction tank; 7. a sedimentation tank; 8. a booster pump; 9. a cartridge filter; 10. a plunger pump; 11. a disk-tube nanofiltration membrane; 111. a filtrate inlet; 112. a concentrated water outlet; 113. a water outlet for producing water; 12. a chemical oxidation pond; 13. a medicine adding oxidation chamber; 14. a raw material tank; 15. an evaporator; 151. a raw material inlet; 152. an eluate inlet; 153. an evaporation outlet; 154. a crystal slurry outlet; 16. centrifuge No. 1; 17. no. 1 washing machine; 18. no. 1 eluate collection tank; 19. a crystallization tank; 20. centrifuge No. 2; 21. no. 2 washing machine; 22. no. 2 eluate collection pool; 23. a mother liquor tank; 24. a condenser; 25. a condensed water tank; 26. a preheater.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in the figure 1, the device for treating the landfill leachate and separating and extracting the salt thereof comprises a chemical precipitation unit, a membrane filtration unit, a chemical oxidation unit, an evaporation crystallization salt separation unit and a deep treatment unit.
The chemical precipitation unit comprises an adjusting tank 1, a reaction tank, a precipitation tank 7, a dosing precipitation group and a centrifugal pump 2. The reaction tank has two, including No. 1 reaction tank 3 and No. 2 reaction tank 6, add medicine precipitation group and include No. 1 add medicine precipitation chamber 4 and No. 2 add medicine precipitation chamber 5, be connected with No. 1 reaction tank 3, No. 2 reaction tank 6 respectively. The centrifugal pump 2 conveys the garbage leachate after homogenization treatment in the regulating tank 1 to a No. 1 reaction tank 3 through a pipeline, a proper amount of sodium carbonate is added into the No. 1 reaction tank 3 through a No. 1 dosing sedimentation chamber 4 to remove calcium ions with high content in the garbage leachate, after reaction, the garbage leachate is conveyed from the No. 1 reaction tank 3 to a No. 2 reaction tank 6 through a pipeline, a proper amount of heavy metal capture agent is added into the No. 2 reaction tank 6 through a No. 2 dosing sedimentation chamber 5, heavy metal ions such as cadmium, chromium, lead, copper, nickel and the like in the garbage leachate are removed by the heavy metal capture agent, and after reaction, the garbage leachate in the No. 2 reaction tank 6 is conveyed to a sedimentation tank 7 through a pipeline to be stood and settled.
The membrane filtration unit comprises a booster pump 8, a cartridge filter 9, a plunger pump 10, a disk-type nanofiltration membrane 11, and a membrane washing device (not shown), and further, as shown in fig. 2, the disk-type nanofiltration membrane comprises a filtrate inlet 111, a concentrated water outlet 112, and a produced water outlet 113.
The sedimentation tank 7, the cartridge filter 9 and the filtering liquid inlet 111 of the disc-tube type nanofiltration membrane are sequentially communicated through pipelines, the booster pump 8 conveys the supernatant in the sedimentation tank 7 to the cartridge filter 9, and the cartridge filter 9 filters a small amount of precipitate in the supernatant. Then the plunger pump 10 conveys the filtrate in the cartridge filter 9 to the disc-tube nanofiltration membrane 11, the disc-tube nanofiltration membrane 11 has the characteristics of permeating monovalent ions and intercepting multivalent ions, and can further remove multivalent ions such as calcium ions, magnesium ions, sulfate ions, heavy metal ions and the like in the landfill leachate and remove most macromolecular organic matters at the same time. After being filtered by the nanofiltration membrane 11, the concentrated water which does not pass through the nanofiltration membrane 11 is discharged from the concentrated water outlet 112 and is recharged to the refuse landfill, and the produced water which passes through the nanofiltration membrane enters the next treatment link from the produced water outlet 113 of the nanofiltration membrane 11. The membrane washing device regularly washes the disc-tube type nanofiltration membrane 11, recovers the flux of the nanofiltration membrane, and prevents inorganic salt from blocking the nanofiltration membrane and influencing the stability of the membrane filtration system.
The chemical oxidation unit comprises a dosing oxidation device and a chemical oxidation tank, the chemical reaction tank is connected with a water outlet 113 of the dish-tube type nanofiltration membrane through a pipeline, and the produced water passing through the filtration membrane enters the chemical oxidation tank 12 from the water outlet 113. The chemical-adding oxidation chamber 13 is connected with the chemical oxidation tank 12 and is used for adding hydrochloric acid and hypochlorous acid into the chemical oxidation tank 12 in sequence. When hydrochloric acid is added, a pH controller is used for controlling the pH value of the percolate to be 6; and then adding a proper amount of sodium hypochlorite for oxidation, wherein the sodium hypochlorite can be hydrolyzed to generate hypochlorous acid, the sodium hypochlorite has strong oxidation capacity, organic matters in the landfill leachate can be efficiently degraded, and a small amount of introduced sodium ions and chloride ions can be recycled in the subsequent evaporative crystallization process.
The evaporative crystallization salt separation unit comprises a raw material tank 14, an evaporator 15, a No. 1 centrifuge 16, a No. 1 washing machine 17, a No. 1 eluate collecting tank 18, a crystallization tank 19, a No. 2 centrifuge 20, a No. 2 washing machine 21, a No. 2 eluate collecting tank 22, a mother liquor tank 23 and a preheater 26.
Further, as shown in fig. 3, the evaporator includes a raw material inlet 151, an eluate inlet 152, an evaporation outlet 153, and a magma outlet 154, the raw material tank 14 is connected to the evaporator raw material inlet 151, the No. 1 centrifuge 16 is connected to the evaporator magma outlet 154, the produced water after oxidation in the chemical oxidation pond 12 is transported to the raw material tank 14 through a pipeline, and the produced water is preheated by the preheater 26 and then transported to the evaporator 15. The principle adopted by the evaporative crystallization salt separation unit is that by utilizing the characteristics that the solubility of potassium chloride in the landfill leachate is far greater than that of sodium chloride and the content of sodium chloride in the landfill leachate is higher at the temperature of 100 ℃, sodium chloride with higher purity is separated out at the stage of sodium chloride saturation and potassium chloride unsaturation through an evaporative crystallization process.
Therefore, the evaporator 15 carries out evaporation crystallization at 100 ℃, when the evaporation is carried out until sodium chloride is supersaturated and a large amount of crystals are separated out, the common saturation point of the sodium chloride and the potassium chloride in the solution is taken as the evaporation end point, the crystal slurry in the evaporation is immediately conveyed to the No. 1 centrifugal machine 16 when the common saturation point is close to the common saturation point, the temperature is maintained to be higher than 90 ℃ when the No. 1 centrifugal machine 16 carries out centrifugal separation of the crystals, and the phenomenon that the potassium chloride is separated out by a large amount of crystals after the temperature is reduced and is mixed with the sodium chloride is avoided.
The No. 1 centrifugal machine 16 is communicated with the No. 1 washing machine 17 and the No. 1 eluate collecting tank 18 through pipelines in sequence, the No. 1 centrifugal machine 16 separates sodium chloride crude products and mother liquor, the sodium chloride crude products are conveyed into the No. 1 washing machine 17 and are cleaned by a small amount of clear water to obtain sodium chloride products and eluate, the eluate is conveyed into the No. 1 eluate collecting tank 18 through a pipeline, the No. 1 eluate collecting tank 18 is connected with an evaporator eluate inlet 152, and the eluate can be recycled to the evaporator 15 as a raw material to be subjected to a repeated crystallization treatment process.
The No. 1 centrifugal machine 16 is communicated with a crystallization tank 19, a No. 2 centrifugal machine 20, a No. 2 washing machine 21 and a No. 2 eluate collection pool 22 sequentially through pipelines, mother liquor separated from the No. 1 centrifugal machine 16 is conveyed into the crystallization tank 19 while the mother liquor is hot, is cooled to room temperature and is not separated out of crystals, then is conveyed into the No. 2 centrifugal machine 20 for centrifugal separation of crystals, and the No. 2 centrifugal machine 20 separates out a potassium chloride crude product and the mother liquor. The potassium chloride crude product is conveyed into a No. 2 washing machine 21, a small amount of clear water is used for washing to obtain a potassium chloride product and eluate, the eluate is conveyed into a No. 2 eluate collecting tank 22 through a pipeline, the No. 2 eluate collecting tank 22 is connected with a crystallization tank 19, the eluate can be reused as a raw material in the crystallization tank for repeated crystallization treatment, mother liquor separated by a No. 2 centrifuge 20 is conveyed into a mother liquor tank 23, one side of the mother liquor tank 23 is connected with the No. 2 centrifuge 20, the other side of the mother liquor tank is connected with a raw material tank 14, and the mother liquor can be reused as the raw material in the raw material tank 14.
The evaporative crystallization salt separation unit further comprises a condenser 24 and a condensed water tank 25, wherein one side of the condenser 24 is connected with the condensed water tank 25, and the other side of the condenser is connected with the evaporator evaporation outlet 153 of the evaporator. The water vapor evaporated by the evaporator is condensed by the condenser 24 and then is conveyed to the condensate water tank 25, and the condensate water is treated by the advanced treatment unit and then is discharged up to the standard or is reused for daily production of the landfill.
To sum up, the utility model discloses a landfill leachate's processing and separation extraction element of its salt, landfill leachate carries out the homogenization at equalizing basin 1 at first and handles, then passes through the pipeline transport to No. 1 reaction tank 3 with the landfill leachate through homogenization in equalizing basin 1 through centrifugal pump 2, and No. 1 reaction tank 3 adds medicine precipitation chamber 4 through No. 1 and throws suitable amount of sodium carbonate, gets rid of the more calcium ion of content in the landfill leachate. After the reaction, the landfill leachate is conveyed from the No. 1 reaction tank 3 to the No. 2 reaction tank 6 through a pipeline, a proper amount of heavy metal capture agent is added into the No. 2 reaction tank 6 through the No. 2 dosing sedimentation chamber 5, heavy metal ions such as cadmium, chromium, lead, copper, nickel and the like in the landfill leachate are removed by the heavy metal capture agent, and after the reaction, the landfill leachate in the No. 2 reaction tank 6 is conveyed to the sedimentation tank 7 through a pipeline to be stood and sedimentated.
Then, the supernatant in the sedimentation tank 7 is conveyed to a cartridge filter 9 through a booster pump 8, the cartridge filter 9 filters a small amount of sediment in the supernatant, a plunger pump 10 conveys the filtrate in the cartridge filter 9 to a disc-tube nanofiltration membrane 11, and the disc-tube nanofiltration membrane 11 further removes polyvalent ions such as calcium ions, magnesium ions, sulfate ions, heavy metal ions and the like in the landfill leachate and simultaneously removes most of macromolecular organic matters. After being filtered by the nanofiltration membrane 11, the concentrated water which does not pass through the nanofiltration membrane 11 is discharged from the concentrated water outlet 112 and is recharged to the refuse landfill, and the produced water which passes through the nanofiltration membrane enters the next treatment link from the produced water outlet 113 of the nanofiltration membrane 11.
The produced water enters the chemical oxidation tank 12 from a produced water outlet 113 through the disc-tube nanofiltration membrane 11, hydrochloric acid and hypochlorous acid are sequentially added into the chemical oxidation tank 12 by the chemical adding oxidation chamber 13, and when the hydrochloric acid is added, the pH value of the leachate is controlled to be 6 by using a pH controller; when a proper amount of sodium hypochlorite is added, the strong oxidizing property of the hypochlorous acid can degrade organic matters in the landfill leachate, and a small amount of introduced sodium ions and chloride ions can be recycled in the subsequent evaporative crystallization process.
The water produced after the oxidation in the chemical oxidation pond 12 is conveyed to the raw material tank 14 through a pipeline, preheated by the preheater 26 and then conveyed to the evaporator 15. By utilizing the characteristics that the solubility of potassium chloride in the landfill leachate is far greater than that of sodium chloride and the content of sodium chloride in the landfill leachate is higher at the temperature of 100 ℃, sodium chloride with higher purity is separated out at the stage of sodium chloride saturation and potassium chloride unsaturation through an evaporative crystallization process. Therefore, the evaporator carries out evaporation crystallization at 100 ℃, when the evaporation is carried out until sodium chloride is supersaturated and a large amount of crystals are separated out, the common saturation point of the sodium chloride and the potassium chloride in the solution is taken as the evaporation end point, the crystal slurry in the evaporation is immediately conveyed to the No. 1 centrifugal machine 16 when the common saturation point is close to the common saturation point, the temperature is maintained to be more than 90 ℃ when the No. 1 centrifugal machine 16 carries out centrifugal separation of the crystals, and the phenomenon that the potassium chloride is separated out by a large amount of crystals after the temperature is reduced and is mixed with the sodium.
The No. 1 centrifugal machine 16 separates out crude sodium chloride and mother liquor, wherein the crude sodium chloride is conveyed to the No. 1 washing machine 17, a small amount of clear water is used for washing to obtain a sodium chloride product and eluate, the eluate is conveyed to the No. 1 eluate collecting tank 18 through a pipeline, and the eluate can be reused as a raw material to be recycled to the evaporator 15 for repeated crystallization treatment.
The mother liquor separated in the No. 1 centrifugal machine 16 is conveyed into a crystallization tank 19 while hot, is cooled to room temperature and is not separated out of crystals, and then is conveyed into a No. 2 centrifugal machine 20 for centrifugal separation of crystals, and the No. 2 centrifugal machine 20 separates out crude potassium chloride and mother liquor. Wherein the crude potassium chloride product is conveyed to a No. 2 washing machine 21, and is washed by a small amount of clear water to obtain a potassium chloride product and an eluate, the eluate is conveyed to a No. 2 eluate collecting tank 22 through a pipeline, the eluate can be recycled to a crystallization tank as a raw material to repeat a crystallization treatment process, a mother liquor separated by a No. 2 centrifuge 20 is conveyed to a mother liquor tank 23, and the mother liquor can be recycled to a raw material tank 14 as a raw material.
The evaporative crystallization salt separation unit further comprises a condenser 24 and a condensed water tank 25, wherein one side of the condenser 24 is connected with the condensed water tank 25, and the other side of the condenser is connected with the evaporator evaporation outlet 153 of the evaporator. The water vapor evaporated by the evaporator is condensed by the condenser 24 and then is conveyed to the condensate water tank 25, and the condensate water is treated by the advanced treatment unit and then is discharged up to the standard or is reused for daily production of the landfill.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. The utility model provides a landfill leachate's processing and separation extraction element of its salt which characterized in that includes:
the chemical precipitation unit comprises an adjusting tank, a reaction tank, a precipitation tank and a dosing precipitation group, wherein the dosing precipitation group is connected with the reaction tank, and the adjusting tank, the reaction tank and the precipitation tank are sequentially communicated;
the membrane filtering unit comprises a security filter and a disc tube type nanofiltration membrane, and the sedimentation tank, the security filter and the disc tube type nanofiltration membrane are communicated in sequence;
the chemical oxidation unit comprises a dosing oxidation chamber and a chemical oxidation tank, wherein the dosing oxidation chamber is connected with the chemical oxidation tank, and the disc-tube nanofiltration membrane is connected with the chemical oxidation tank;
the evaporative crystallization salt separation unit comprises a raw material tank, an evaporator, a No. 1 centrifugal machine, a No. 1 washing machine, a No. 1 eluate collection pool, a crystallization tank, a No. 2 centrifugal machine, a No. 2 washing machine, a No. 2 eluate collection pool and a mother liquor tank, wherein the raw material tank is connected with the evaporator, the evaporator is connected with the No. 1 centrifugal machine, the No. 1 washing machine and the No. 1 eluate collection pool are sequentially communicated, and the No. 1 centrifugal machine, the crystallization tank, the No. 2 centrifugal machine, the No. 2 washing machine and the No. 2 eluate collection pool are sequentially communicated.
2. The device for treating landfill leachate and separating and extracting salts thereof according to claim 1, wherein the device comprises: the reaction tank includes No. 1 reaction tank, No. 2 reaction tank, add medicine precipitation group and include that No. 1 adds the medicine drip chamber and No. 2 adds the medicine drip chamber, No. 1 add medicine drip chamber, No. 2 add the medicine drip chamber respectively with No. 1 reaction tank, No. 2 reaction tanks are connected.
3. The device for treating landfill leachate and separating and extracting salts thereof according to claim 1, wherein the device comprises: the membrane filtering unit also comprises a membrane washing device for washing the disc-tube nanofiltration membrane.
4. The device for treating landfill leachate and separating and extracting salts thereof according to claim 1, wherein the device comprises: the No. 1 eluate collection tank is connected with the evaporator, and the No. 2 eluate collection tank is connected with the crystallization tank.
5. The device for treating landfill leachate and separating and extracting salts thereof according to claim 1, wherein the device comprises: mother liquor jar one side with 2 centrifuge is connected, the opposite side with the head tank is connected.
6. The device for treating landfill leachate and separating and extracting salts thereof according to claim 1, wherein the device comprises: the evaporative crystallization salt separation unit further comprises a condenser and a condensate tank, wherein one side of the condenser is connected with the condensate tank, and the other side of the condenser is connected with the evaporator.
7. The device for treating landfill leachate and separating and extracting salts thereof according to claim 6, wherein the device comprises: the separation and extraction device also comprises an advanced treatment unit which is used for treating the condensed water in the condensed water tank.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417491A (en) * | 2022-08-16 | 2022-12-02 | 龙佰集团股份有限公司 | Method for synergistically removing TOC and ammonia nitrogen in sodium chloride wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417491A (en) * | 2022-08-16 | 2022-12-02 | 龙佰集团股份有限公司 | Method for synergistically removing TOC and ammonia nitrogen in sodium chloride wastewater |
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