CN209890387U - Treatment system of reverse osmosis concentrated water with high permanent hardness - Google Patents
Treatment system of reverse osmosis concentrated water with high permanent hardness Download PDFInfo
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- CN209890387U CN209890387U CN201822113398.6U CN201822113398U CN209890387U CN 209890387 U CN209890387 U CN 209890387U CN 201822113398 U CN201822113398 U CN 201822113398U CN 209890387 U CN209890387 U CN 209890387U
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000012267 brine Substances 0.000 claims abstract description 28
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 11
- 239000004571 lime Substances 0.000 claims abstract description 11
- 239000012528 membrane Substances 0.000 claims description 37
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 36
- 239000002562 thickening agent Substances 0.000 claims description 34
- 238000004062 sedimentation Methods 0.000 claims description 29
- 239000013078 crystal Substances 0.000 claims description 19
- 239000000292 calcium oxide Substances 0.000 claims description 18
- 235000012255 calcium oxide Nutrition 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000002351 wastewater Substances 0.000 claims description 15
- 238000011001 backwashing Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 8
- 238000005352 clarification Methods 0.000 claims description 7
- 239000008394 flocculating agent Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002455 scale inhibitor Substances 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 4
- 230000001112 coagulating effect Effects 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- 230000003311 flocculating effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 10
- 238000002425 crystallisation Methods 0.000 description 10
- 230000008025 crystallization Effects 0.000 description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
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Abstract
The utility model belongs to the technical field of sewage treatment, concretely relates to treatment system of reverse osmosis dense water with high permanent hardness. The treatment system comprises a primary crystallizer unit, a primary reverse osmosis filtering unit, a secondary crystallizer unit, a lime softening unit and a secondary reverse osmosis filtering unit which are connected in sequence. The utility model provides a permanent hardness and temporary hardness in the strong brine can be eliminated to processing system, falls to the hardness in the strong brine below 50 mg/L.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to treatment system of reverse osmosis dense water with high permanent hardness.
Background
At present, a large amount of sulfate wastewater is generated in the production process of petrochemical industry, electric power industry, chemical fiber industry and other industries, the reclaimed water obtained after the wastewater is subjected to reverse osmosis treatment can be reused as production water, but the treatment of the generated high-hardness concentrated water becomes a technical and economic problem. If the reverse osmosis concentrated water is directly discharged, the reverse osmosis concentrated water can cause very adverse effect on the surrounding environment. Therefore, it is a very challenging and significant task to realize zero emission of desalination process of brine for recycling or reprocessing of concentrated brine. At present, for strong brine with high permanent hardness, a method of changing permanent hardness (calcium sulfate) to temporary hardness (calcium carbonate) is mainly adopted, and then calcium carbonate is separated out through crystallization and precipitation. However, this process introduces foreign matter, which adds a new burden to downstream processing. Secondly, the water yield of reverse osmosis is only 75%, the yield of the strong brine is high, and the difficulty of crystallization and separation is increased because the strong brine contains the scale inhibitor. Moreover, in the zero-emission process, technologies such as strong evaporation crystallization are utilized, a large amount of energy is consumed, and the cost of softening the medicament is increased by newly introduced carbonate, so that simple and efficient crystallization and concentration technologies are needed for recovering sulfate in water.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to solve at least one of the problems existing in the prior art, this purpose is realized through following technical scheme:
the utility model provides a processing system of dense water of reverse osmosis with high permanent hardness, a serial communication port, including the one-level crystallizer unit, one-level reverse osmosis filter unit, second grade crystallizer unit, lime softening unit and the second grade reverse osmosis filter unit that connect gradually.
The one-level crystallizer unit comprises a first crystallizer, a first thickener and a first centrifugal dehydrator, wherein the inlet of the first crystallizer is connected with a strong brine input pipeline, the inlet of the first crystallizer is connected with a dosing box used for adding a flocculating agent and seed crystals, the outlet of crystal slurry of the first crystallizer is connected with the inlet of the first thickener, and the discharge hole of the first thickener is connected with the inlet of the first centrifugal dehydrator.
The one-level reverse osmosis filtration unit comprises a first multi-media filter and a first reverse osmosis membrane device, the water outlet of the first crystallizer, the water outlet of the first thickener, the water outlet of the first centrifugal dehydrator are connected with the inlet of the first multi-media filter, the outlet of the first multi-media filter is connected with the inlet of the first reverse osmosis membrane device, the first reverse osmosis membrane device is provided with a first outlet and a second outlet, the first outlet is used for water flowing through the reverse osmosis membrane, and the second outlet is used for water flowing through the reverse osmosis membrane.
The second crystallizer unit comprises a second crystallizer, a second thickener and a second centrifugal dehydrator, the inlet of the second crystallizer is connected with the second outlet of the first reverse osmosis membrane device, the inlet of the second crystallizer is also connected with a second dosing box used for adding flocculating agent and crystal seeds, the crystal slurry outlet of the second crystallizer is connected with the inlet of the second thickener, and the discharge hole of the second thickener is connected with the inlet of the second centrifugal dehydrator.
Lime softening unit is including the quick lime reaction tank, coagulating sedimentation tank, flocculation and precipitation tank that connect in order, the water outlet of second crystallizer the water outlet of second stiff ware the water outlet of second centrifugal dehydrator all with quick lime reaction tank's access connection.
The second-stage reverse osmosis filtering unit comprises a second multi-media filter and a second reverse osmosis membrane device, an inlet of the second multi-media filter is connected with a water outlet of the sedimentation tank, and an outlet of the second multi-media filter is connected with an inlet of the second reverse osmosis membrane device.
Lime softening unit still includes third stiff ware and third centrifugal dehydrator, the import of third stiff ware with the discharge gate of sedimentation tank is connected, the export of third stiff ware with the access connection of third centrifugal dehydrator, the water outlet of third stiff ware the delivery port of third centrifugal dehydrator all is connected with the many medium filter of second.
The first crystallizer and the second crystallizer respectively comprise a crystallizing tank, a guide cylinder, a stirrer and a sealing cover, the guide cylinder is arranged inside the crystallizing tank, the stirrer is arranged in the guide cylinder, the stirrer is a push type stirrer, an inlet of the crystallizer is arranged at the middle lower part of the crystallizing tank, a crystal slurry outlet is arranged at the bottom of the crystallizing tank, a clarification area is arranged at the upper part of the crystallizing tank, an annular cavity is formed between the top of the crystallizing tank and the outer wall of the sealing cover, and a water outlet of the crystallizer is arranged at the bottom of the annular cavity; the top of the crystallizing tank is provided with an expansion section which is outwards unfolded at an angle of 30 degrees, the top of the expansion section is provided with a vertically arranged overflow baffle, an area formed by the expansion section and the overflow baffle is the clarification area, and the annular cavity is formed between the overflow baffle and the outer wall of the sealing cover.
The bottoms of the first multi-media filter and the second multi-media filter are respectively communicated with a cleaning fan, backwashing wastewater outlets are respectively arranged on the first multi-media filter and the second multi-media filter, the backwashing wastewater outlet of the first multi-media filter is connected with the inlet of the first crystallizer, and the backwashing wastewater outlet of the second multi-media filter is connected with the inlet of the quicklime reaction tank.
The sedimentation tank is an inclined plate sedimentation tank, a quicklime dosing tank is arranged on the quicklime reaction tank, a coagulant dosing tank is arranged on the coagulating sedimentation tank, and a flocculating agent dosing tank is arranged on the flocculating sedimentation tank; the inlet of the first reverse osmosis membrane device is also connected with a scale inhibitor dosing device and a reducing agent dosing device, the bottom of the first reverse osmosis membrane device is connected with a first chemical cleaning device, and the bottom of the second reverse osmosis membrane device is connected with a second chemical cleaning device.
The utility model has the advantages that: 1. the utility model provides a permanent hardness and temporary hardness in the strong brine can be eliminated to processing system, falls to the hardness in the strong brine below 50 mg/L. 2. The utility model discloses compare in traditional method of throwing sodium sulfate and handling high permanent hardness, not add extra medicament, both saved the medicament cost, also reduced the loaded down with trivial details degree of later stage further processing sulphate. 3. The utility model discloses well reverse osmosis dense water is through multistage filtration, and the water resource obtains retrieving many times, has increased the output of reclaimed water. 4. The utility model discloses combined induced crystallization and reverse osmosis technique, multistage device can retrieve the calcium sulfate more than 90%, and the purity of calcium sulfate can reach more than 97%, has realized the target of aquatic pollutant resourceization.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow diagram of a treatment system of the present invention;
fig. 2 is a schematic structural diagram of the treatment system of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in figure 1, the utility model provides a treatment system of concentrated water of reverse osmosis with high permanent hardness, including the one-level crystallizer unit 1, one-level reverse osmosis filter unit 2, second grade crystallizer unit 3, lime softening unit 4 and the second grade reverse osmosis filter unit 5 that connect gradually.
Further, as shown in fig. 2, the primary crystallizer unit 1 includes a first crystallizer 101, a first thickener 102 and a first centrifugal dehydrator 103, an inlet of the first crystallizer 101 is connected to a concentrated brine input pipe 104, an inlet of the first crystallizer 101 is further connected to a feeding box 105 for feeding a flocculant and a seed crystal, a slurry outlet of the first crystallizer 101 is connected to an inlet of the first thickener 102, and a discharge outlet of the first thickener 102 is connected to an inlet of the first centrifugal dehydrator 103.
Further, the first-stage reverse osmosis filtration unit 2 comprises a first multi-media filter 201 and a first reverse osmosis membrane device 202, the water outlet of the first crystallizer 101, the water outlet of the first thickener 102 and the water outlet of the first centrifugal dehydrator 103 are all connected with the inlet of the first multi-media filter 201, and the outlet of the first multi-media filter 201 is connected with the inlet of the first reverse osmosis membrane device 202. The first reverse osmosis membrane device 202 has a first outlet for the flow of water that has passed through the reverse osmosis membrane and a second outlet for the flow of water that has not passed through the reverse osmosis membrane.
Further, the secondary crystallizer unit 3 includes a second crystallizer 301, a second thickener 302 and a second centrifugal dehydrator 303, an inlet of the second crystallizer 301 is connected to a second outlet of the first reverse osmosis membrane apparatus 202, an inlet of the second crystallizer 301 is further connected to a second dosing tank 304 for adding a flocculant and a seed crystal, a magma outlet of the second crystallizer 301 is connected to an inlet of the second thickener 302, and a discharge port of the second thickener 302 is connected to an inlet of the second centrifugal dehydrator 303.
Further, the lime softening unit 4 includes a quick lime reaction tank 401, a coagulating sedimentation tank 402, a flocculating sedimentation tank 403 and a sedimentation tank 404 which are connected in sequence, and a water outlet of the second crystallizer 301, a water outlet of the second thickener 302 and a water outlet of the second centrifugal dehydrator 303 are all connected with an inlet of the quick lime reaction tank 401.
Further, the two-stage reverse osmosis filtration unit 5 comprises a second multi-media filter 501 and a second reverse osmosis membrane device 502, wherein the inlet of the second multi-media filter 501 is connected with the water outlet of the sedimentation tank 404, and the outlet of the second multi-media filter 501 is connected with the inlet of the second reverse osmosis membrane device 502.
Further, the lime softening unit 4 further includes a third thickener 405 and a third centrifugal dehydrator 406, an inlet of the third thickener 405 is connected to the discharge port of the sedimentation tank 404, an outlet of the third thickener 405 is connected to an inlet of the third centrifugal dehydrator 406, and a water outlet of the third thickener 405 and a water outlet of the third centrifugal dehydrator 406 are both connected to the second multi-media filter 501.
Further, the first crystallizer 101 and the second crystallizer 301 have the same structure, and the first crystallizer 101 will be described as an example. The first crystallizer 101 comprises a crystallizing tank 1011, a guide cylinder 1012, a stirrer 1013 and a cover 1014, wherein the guide cylinder 1012 is arranged inside the crystallizing tank 1011, the stirrer 1013 is arranged in the guide cylinder 1012, the stirrer 1013 is a propeller stirrer, an inlet of the crystallizer 1011 is arranged at the middle lower part of the crystallizing tank 1011, a crystal slurry outlet 1015 is arranged at the bottom of the crystallizing tank 1011, a clarification zone 1016 is arranged at the upper part of the crystallizing tank 1011, an annular cavity 1017 is formed between the top of the crystallizing tank 1011 and the outer wall of the cover 1014, and a water outlet of the crystallizer is arranged at the bottom of the annular cavity 1017. When the first crystallizer 101 is in operation, under the pushing of the stirrer 1013, the water flow can descend along the inner wall of the guide cylinder 1012 and ascend along the outer wall of the guide cylinder 1012, so as to form a circulation, and by adjusting the rotation speed of the stirrer 1013, the ascending and descending speed of the water flow can be 9 times of the flow speed of the concentrated brine entering the first crystallizer 101, namely, the reflux rate of the crystal liquid is 800%.
Further, the top of the crystallizing tank 1011 is provided with an expanding section which is outwards expanded at an angle of 30 degrees, the top of the expanding section is provided with a vertically arranged overflow baffle 1018, the area formed by the expanding section, the overflow baffle 1018 and the clarification baffle 1019 is a clarification area 1016, and an annular cavity 1017 is formed between the overflow baffle 1018 and the outer wall of the cover 1014. The brine obtained after crystallization with permanent hardness removed overflows to the water outlet via overflow baffle 1018 and enters the first stage reverse osmosis filtration unit 2.
Further, the bottom of the first multimedia filter 201 is communicated with the cleaning fan 206, the bottom of the second multimedia filter 501 is communicated with the cleaning fan 506, backwashing wastewater outlets are respectively arranged on the first multimedia filter 201 and the second multimedia filter 501, the backwashing wastewater outlet of the first multimedia filter 201 is connected with the inlet of the first crystallizer 101, and backwashing wastewater flows back to the first crystallizer 101 to be treated through the crystallization process and the first multimedia filter 201, so that no redundant wastewater is generated.
Further, a backwashing wastewater outlet of the second multimedia filter 501 is connected with an inlet of the quicklime reaction tank 401. The backwashing wastewater flows to the inlet of the front-section quicklime reaction tank 401 for secondary treatment, and no redundant wastewater is generated.
Further, the sedimentation tank 404 is an inclined plate sedimentation tank, a quicklime dosing tank 407 is arranged on the quicklime reaction tank 401, a coagulant dosing tank 408 is arranged on the coagulation sedimentation tank 402, and a flocculant dosing tank 409 is arranged on the flocculation sedimentation tank 403.
Further, the inlet of the first reverse osmosis membrane device 202 is also connected with a scale inhibitor dosing device 203 and a reducing agent dosing device 204.
Further, a first chemical cleaning device 205 is connected to the bottom of the first reverse osmosis membrane device 202, and a second chemical cleaning device 505 is connected to the bottom of the second reverse osmosis membrane device 502, so that the reverse osmosis membrane device can be cleaned periodically.
Utilize the utility model discloses the process of system treatment high rigidity reverse osmosis water as follows:
1) introducing reverse osmosis concentrated water into a first crystallizer 101 through a concentrated brine input pipeline 104, simultaneously, putting a flocculating agent capable of eliminating the dispersion effect of a scale inhibitor and calcium sulfate crystal seeds capable of promoting crystal growth into the first crystallizer 101 through a dosing box 105, crystallizing the concentrated water in the first crystallizer 101, feeding crystal slurry obtained in the crystallization process into a first thickener 102 for concentration treatment, then conveying the crystal slurry to a first centrifugal dehydrator 103 for dehydration treatment to obtain calcium sulfate with low water content, wherein the water separated in the crystallization process is brine with partial permanent hardness eliminated, and conveying the brine and the water separated by the first thickener 102 and the first centrifugal dehydrator 103 to a first-stage reverse osmosis filtering unit 2;
2) after the brine conveyed to the primary reverse osmosis filtering unit 2 passes through the first multimedia filter 201, suspended matters and fine grains in the brine are removed, the brine enters the first reverse osmosis membrane device 202 for filtering, clear water obtained by filtering is recycled as reclaimed water, and reverse osmosis concentrated water which does not permeate through the membrane is conveyed to the secondary crystallizer unit 3;
3) the concentrated water sent to the second crystallizer 301 has the same treatment process as the primary crystallizer unit 1, the water separated in the crystallization process is brine with all permanent hardness eliminated, and the brine and the water separated by the second thickener 302 and the second centrifugal dehydrator 303 are both sent to the lime softening unit 4;
4) the brine transferred to the quicklime softening unit 4 is reacted with ca (oh) in the quicklime reaction tank 4012The reaction is carried out to generate calcium carbonate, magnesium ions are precipitated in the form of magnesium carbonate under the condition that the PH value is 11, then coagulant is sequentially added into the brine in a coagulation sedimentation tank 402, flocculant is added into a flocculation sedimentation tank 403, and finally sedimentation is carried out in a sedimentation tank 404, so that solid-liquid separation is realized, and the liquid obtained after the separation is the brine with temporary hardness eliminated;
5) the water from which the permanent hardness and the temporary hardness are removed is transferred to the second multimedia filter 501 to remove a small amount of suspended substances and fine crystal particles contained in the water, and then the brine is transferred to the second reverse osmosis membrane apparatus 502 to be filtered, and the regenerated water is recovered again to obtain further concentrated brine.
Further, the residence time of the reverse osmosis concentrated water in the first crystallizer 101 and the residence time of the reverse osmosis concentrated water in the second crystallizer 301 are both less than 1.5 hours, preferably 1 hour.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The treatment system of reverse osmosis concentrated water with high permanent hardness is characterized by comprising a primary crystallizer unit, a primary reverse osmosis filtering unit, a secondary crystallizer unit, a lime softening unit and a secondary reverse osmosis filtering unit which are sequentially connected.
2. A treatment system for reverse osmosis concentrated water with high permanent hardness according to claim 1, wherein the primary crystallizer unit comprises a first crystallizer, a first thickener and a first centrifugal dehydrator, an inlet of the first crystallizer is connected with a concentrated brine input pipeline, an inlet of the first crystallizer is further connected with a dosing box for adding a flocculating agent and seed crystals, a crystal slurry outlet of the first crystallizer is connected with an inlet of the first thickener, and a discharge outlet of the first thickener is connected with an inlet of the first centrifugal dehydrator.
3. The system of claim 2, wherein the primary reverse osmosis filtration unit comprises a first multimedia filter and a first reverse osmosis membrane unit, the water outlet of the first crystallizer, the water outlet of the first thickener, and the water outlet of the first centrifugal dehydrator are connected to the inlet of the first multimedia filter, the outlet of the first multimedia filter is connected to the inlet of the first reverse osmosis membrane unit, the first reverse osmosis membrane unit has a first outlet through which water passing through the reverse osmosis membrane flows out, and a second outlet through which concentrated brine passing through the reverse osmosis membrane flows out.
4. A treatment system for reverse osmosis concentrated water with high permanent hardness according to claim 3, wherein the secondary crystallizer unit comprises a second crystallizer, a second thickener and a second centrifugal dehydrator, an inlet of the second crystallizer is connected with a second outlet of the first reverse osmosis membrane device, an inlet of the second crystallizer is further connected with a second feeding box for feeding flocculating agent and seed crystal, a crystal slurry outlet of the second crystallizer is connected with an inlet of the second thickener, and a discharge outlet of the second thickener is connected with an inlet of the second centrifugal dehydrator.
5. The system for treating reverse osmosis concentrated water with high permanent hardness according to claim 4, wherein the lime softening unit comprises a quicklime reaction tank, a coagulating sedimentation tank, a flocculating sedimentation tank and a sedimentation tank which are connected in sequence, and the water outlet of the second crystallizer, the water outlet of the second thickener and the water outlet of the second centrifugal dehydrator are connected with the inlet of the quicklime reaction tank.
6. The system of claim 5 wherein the secondary reverse osmosis filtration unit includes a second multi-media filter having an inlet connected to the water outlet of the sedimentation tank and a second reverse osmosis membrane device having an outlet connected to the inlet of the second reverse osmosis membrane device.
7. The system of claim 6, wherein the lime softening unit further comprises a third thickener and a third centrifugal dehydrator, an inlet of the third thickener is connected with the discharge hole of the sedimentation tank, an outlet of the third thickener is connected with an inlet of the third centrifugal dehydrator, and a water outlet of the third thickener and a water outlet of the third centrifugal dehydrator are both connected with a second multi-media filter.
8. The system for treating reverse osmosis concentrated water with high permanent hardness according to claim 4, 5, 6 or 7, wherein each of the first crystallizer and the second crystallizer comprises a crystallizing tank, a guide flow cylinder, a stirrer and a sealing cover, the guide flow cylinder is arranged inside the crystallizing tank, the stirrer is arranged in the guide flow cylinder, the stirrer is a pushing stirrer, an inlet of the crystallizer is arranged at the middle lower part of the crystallizing tank, the crystal slurry outlet is arranged at the bottom of the crystallizing tank, the upper part of the crystallizing tank is provided with a clarification zone, an annular cavity is formed between the top of the crystallizing tank and the outer wall of the sealing cover, and a water outlet of the crystallizer is arranged at the bottom of the annular cavity; the top of the crystallizing tank is provided with an expansion section which is outwards unfolded at an angle of 30 degrees, the top of the expansion section is provided with a vertically arranged overflow baffle, an area formed by the expansion section and the overflow baffle is the clarification area, and the annular cavity is formed between the overflow baffle and the outer wall of the sealing cover.
9. A treatment system for reverse osmosis concentrated water with high permanent hardness according to claim 6, wherein the bottoms of the first multi-media filter and the second multi-media filter are respectively communicated with a cleaning fan, backwashing wastewater outlets are respectively arranged on the first multi-media filter and the second multi-media filter, the backwashing wastewater outlet of the first multi-media filter is connected with the inlet of the first crystallizer, and the backwashing wastewater outlet of the second multi-media filter is connected with the inlet of the quicklime reaction tank.
10. A treatment system of reverse osmosis concentrated water with high permanent hardness according to claim 6, wherein the sedimentation tank is an inclined plate sedimentation tank, a quicklime dosing tank is arranged on the quicklime reaction tank, a coagulant dosing tank is arranged on the coagulation sedimentation tank, and a flocculant dosing tank is arranged on the flocculation sedimentation tank; the inlet of the first reverse osmosis membrane device is also connected with a scale inhibitor dosing device and a reducing agent dosing device, the bottom of the first reverse osmosis membrane device is connected with a first chemical cleaning device, and the bottom of the second reverse osmosis membrane device is connected with a second chemical cleaning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822113398.6U CN209890387U (en) | 2018-12-16 | 2018-12-16 | Treatment system of reverse osmosis concentrated water with high permanent hardness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822113398.6U CN209890387U (en) | 2018-12-16 | 2018-12-16 | Treatment system of reverse osmosis concentrated water with high permanent hardness |
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