CN216273587U - Low-cost reuse of reclaimed water strong brine resourceful zero release processing apparatus - Google Patents
Low-cost reuse of reclaimed water strong brine resourceful zero release processing apparatus Download PDFInfo
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- CN216273587U CN216273587U CN202123039127.9U CN202123039127U CN216273587U CN 216273587 U CN216273587 U CN 216273587U CN 202123039127 U CN202123039127 U CN 202123039127U CN 216273587 U CN216273587 U CN 216273587U
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Abstract
The utility model relates to the technical field of reclaimed water zero-emission treatment, in particular to a low-cost reclaimed water reuse strong brine recycling zero-emission treatment device, which comprises a reclaimed water storage tank, a crystallizer, a saltpeter evaporator, a waste treatment device and a waste treatment device, wherein the saltpeter evaporator is connected with the crystallizer; the brine refining treatment device is connected with the crystallizer and is used for carrying out brine refining treatment on the sodium chloride salt slurry generated by the crystallizer; the chemical separation device is used for treating the mother liquor and the mirabilite salt slurry; the sludge storage tank is used for collecting the sediments generated by the chemical separation device; the inorganic membrane separation tank is used for carrying out inorganic membrane separation on the clear liquid generated by the chemical separation device; the centrifugal dehydrator is used for centrifugally separating the sludge in the sludge storage tank, so that the utility model can better finish the zero emission treatment of reclaimed water resource, simultaneously save the drying part in the prior art, effectively save the drying heat source and the power consumption and reduce the cost.
Description
Technical Field
The utility model relates to the technical field of reclaimed water zero-emission treatment, in particular to a low-cost reclaimed water recycling strong brine zero-emission treatment device.
Background
The zero emission is based on basic sewage treatment engineering and energy conservation and emission reduction, aiming at basic sewage treatment processes generated by different pollution types and pollution indexes, and regarding pollution control indexes, the zero emission mainly comprises the following steps: pollutants of one type, COD, ammonia nitrogen, total nitrogen, TP (total phosphorus) and the like; one class of contaminants includes mainly heavy metals, radioactive materials and toxic materials, which are strictly regulated, and their side products (e.g., sludge) are also disposed of as hazardous waste. Pollution indexes such as COD, ammonia nitrogen, total nitrogen, TP (total phosphorus) and the like are biochemical indexes, and the treatment of the pollution indexes is mainly carried out by processes such as strong oxidation, biochemical treatment and the like, so that the subsequent acceptance condition of reclaimed water reuse is required to be met. The reclaimed water zero-emission treatment is to treat the treated sewage again to form solid matters or realize resource utilization so as to realize the zero-emission process operation of a water system.
Conventional zero emission treatment devices are mainly developed around three aspects: 1) the concentration reduction, the reclaimed water reuse treatment device can concentrate TDS (total nitrogen) to 20000mg/L mostly and then concentrate through membranes at two ends, the concentration multiplying power is usually 10-12 times, in this case, the concentrated water quantity of reclaimed water is more, the TDS can be concentrated to 80000-. According to different technical measures, the concentration and decrement process generally comprises a, a double-alkali softening process; b. membrane concentration salt separation process; c. a hot method concentration salt separation process; 2) an evaporative crystallization system, which is used for forming crystals by means of a crystallizer and further concentrating the crystals to form saturated salt, and generally comprises two means of forced circulation evaporative crystallization and MVR mechanical compression evaporative crystallization; 3) drying solids production systems, aimed at forming solids, typically include means such as bypass flue drying, spray drying and flash drying.
The above-mentioned processes are unified, and the problems are that the cost is high, or the construction cost required by itself is too high, or the cost of the whole device is increased by using more drying heat sources and power consumption because drying is required.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide a low-cost concentrated brine recycling zero-emission treatment device for recycling reclaimed water, which can effectively reduce the cost while better completing the zero-emission treatment of reclaimed water recycling.
In order to realize the aim, the low-cost concentrated brine recycling zero-emission treatment device for recycling reclaimed water provided by the utility model adopts the following technical scheme:
the utility model provides a low-cost reuse of reclaimed water strong brine resourceization zero release processing apparatus, includes:
the reclaimed water storage tank is used for storing and collecting reclaimed water reuse strong brine;
the crystallizer is connected with the reclaimed water storage tank and is used for carrying out crystallization treatment on reclaimed water reuse strong brine to crystallize out most sodium chloride salt slurry and obtain mother liquor rich in sodium sulfate;
the sodium chloride solution is dissolved into an unsaturated solution, and the residual heated sodium chloride in the sodium chloride evaporator is introduced into the crystallizer again;
the waste treatment device is connected with the crystallizer and is used for receiving the mirabilite slurry generated by the mirabilite evaporator through a mirabilite slurry preparation tank;
the brine refining treatment device is connected with the crystallizer and is used for carrying out brine refining treatment on the sodium chloride salt slurry generated by the crystallizer to obtain a saturated sodium chloride solution with less calcium and magnesium impurities and still containing a sodium sulfate component with a certain concentration;
a chemical separation device for treating the mother liquor and the mirabilite salt slurry to form a precipitate;
the sludge storage tank is used for collecting the sediments generated by the chemical separation device;
the inorganic membrane separation tank is used for carrying out inorganic membrane separation on the clear liquid generated by the chemical separation device;
and the centrifugal dehydrator is used for performing centrifugal separation on the sludge in the sludge storage tank.
Further, the brine refining treatment device comprises a sodium chloride salt slurry preparation tank for receiving the sodium chloride salt slurry, a sodium chloride electrolytic tank, a first brine refining tank and a second brine refining tank.
Further, the chemical separation device is a chemical separation tank.
The low-cost reclaimed water reuse strong brine recycling zero-emission treatment device provided by the utility model has the beneficial effects that: sulfate, calcium salt and magnesium salt all form precipitates, sodium chloride is fully electrolyzed into hydrogen, chlorine and liquid saturated sodium hydroxide through repeated treatment, in the process, mother liquor rich in sodium sulfate and high hardness and mirabilite salt slurry are generated through evaporation, and in the chemical separation process, a compound special medicament is required to be added to form good precipitate separation instead of flocculent or colloidal precipitates which are formed in the prior art and are difficult to separate; the necessity of membrane separation is that sulfate precipitates and calcium-magnesium precipitates cannot be completely removed by a chemical separation method, fine crystal precipitates need to be removed by membrane separation measures, otherwise, supernatant liquid flows back to a reclaimed water storage tank for retreatment, and the crystal precipitates are continuously accumulated to cause faults; compared with a conventional desliming device, the centrifugal dehydrator can effectively form sludge without adding a medicament; the sodium chloride and the mirabilite salt slurry separated by the crystal seed method evaporative crystallizer device have low quality requirements and do not need to reach the product level, the subsequent sodium chloride brine refining, the electrolysis device and the waste treatment device of the device can well reprocess the partial product, the return iteration generated by the waste treatment device cannot cause system operation failure, and the balance of the system can be well realized; in conclusion, the utility model better completes the zero discharge treatment of reclaimed water resource, simultaneously saves the drying part in the prior art, effectively saves the drying heat source and the power consumption, and reduces the cost.
Drawings
FIG. 1 is a schematic diagram showing the cooperation of each device in the low-cost concentrated brine recycling treatment device for reuse.
Reference numbers in the figures: 1. a reclaimed water storage tank; 2. a nitre evaporator; 3. a sodium chloride salt slurry preparation tank; 4. a waste disposal device; 5. a mirabilite salt slurry preparation tank; 6. a sodium chloride electrolytic cell; 7. a chemical separation tank; 8. a sludge storage tank; 9. a centrifugal dehydrator; 10. a triple effect evaporator; 11. a crystallizer; 13. a first brine refining tank; 14. a second brine refining tank; 15. an inorganic membrane separation tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model, are within the scope of the utility model.
As shown in fig. 1, a low-cost reclaimed water reuse strong brine resource zero emission treatment device comprises:
the reclaimed water storage tank 1 is used for storing and collecting reclaimed water reuse strong brine;
the crystallizer 11 is connected with the reclaimed water storage tank 1 and is used for carrying out crystallization treatment on reclaimed water recycled strong brine to crystallize out most sodium chloride salt slurry and obtain mother liquor rich in sodium sulfate;
the sodium nitrate evaporator 2 is connected with the crystallizer 11 and is used for processing the mother liquor which is generated by the crystallizer 11 and is rich in sodium sulfate so as to separate out the sodium sulfate and dissolve the sodium chloride into an unsaturated solution, and the residual heated sodium chloride in the sodium nitrate evaporator 2 is introduced into the crystallizer 11 again;
a waste treatment device 4 connected with the crystallizer 11 and used for receiving the mirabilite slurry generated by the mirabilite evaporator 2 through a mirabilite slurry configuration tank 5;
the brine refining treatment device is connected with the crystallizer 11 and is used for carrying out brine refining treatment on the sodium chloride salt slurry generated by the crystallizer 11 to obtain a saturated sodium chloride solution with less calcium and magnesium impurities and still containing a sodium sulfate component with a certain concentration;
a chemical separation device for treating the mother liquor and the mirabilite salt slurry to form a precipitate;
a sludge storage tank 8 for collecting the precipitate generated by the chemical separation device;
an inorganic membrane separation tank 15 for performing inorganic membrane separation on the clear liquid produced by the chemical separation device;
and the centrifugal dehydrator 9 is used for performing centrifugal separation on the sludge in the sludge storage tank 8.
The brine refining treatment device comprises a sodium chloride salt slurry preparation tank 3 for receiving sodium chloride salt slurry, a sodium chloride electrolytic tank 6, a first brine refining tank 13 and a second brine refining tank 14.
The chemical separation device is a chemical separation tank 7.
The low-cost reclaimed water reuse strong brine recycling zero-emission treatment device provided by the utility model has the beneficial effects that: sulfate, calcium salt and magnesium salt all form precipitates, sodium chloride is fully electrolyzed into hydrogen, chlorine and liquid saturated sodium hydroxide through repeated treatment, in the process, mother liquor rich in sodium sulfate and high hardness and mirabilite salt slurry are generated through evaporation, and in the chemical separation process, a compound special medicament is required to be added to form good precipitate separation instead of flocculent or colloidal precipitates which are formed in the prior art and are difficult to separate; the necessity of membrane separation is that sulfate precipitates and calcium-magnesium precipitates cannot be completely removed by a chemical separation method, fine crystal precipitates need to be removed by membrane separation measures, otherwise, supernatant liquid flows back to the reclaimed water storage tank 1 for retreatment, and the crystal precipitates are continuously accumulated to cause faults; compared with a conventional desliming device, the centrifugal dehydrator 9 can effectively form sludge without adding a medicament; the sodium chloride and the mirabilite salt slurry separated by the crystal seed method evaporative crystallizer 11 device have low quality requirements and do not need to reach the product level, the subsequent sodium chloride brine refining, the electrolysis device and the waste treatment device 4 of the device can well reprocess the partial product, the return iteration generated by the waste treatment device 4 cannot cause system operation failure, and the balance of the system can be well realized; in conclusion, the utility model better completes the zero discharge treatment of reclaimed water resource, simultaneously saves the drying part in the prior art, effectively saves the drying heat source and the power consumption, and reduces the cost.
When the whole device is used specifically, the following processes are carried out:
step S1: treating reclaimed water recycled strong brine in a reclaimed water storage tank 1 by a seed crystal method, then feeding the reclaimed water recycled strong brine into a triple-effect evaporator 10, then crystallizing by using a crystallizer 11, crystallizing most sodium chloride salt slurry according to different solubility characteristics of sodium sulfate and sodium chloride, and obtaining mother liquor rich in sodium sulfate;
step S2: introducing the mother liquor rich in sodium sulfate obtained in the step S1 into a sodium sulfate evaporator 2, heating and evaporating to separate out sodium sulfate and dissolve sodium chloride into unsaturated solution, introducing the separated mirabilite slurry (located in a mirabilite slurry preparation tank 5) into a waste treatment device 4, introducing the residual heated sodium chloride in the sodium sulfate evaporator 2 into the crystallizer 11 in the step S1 again, and further evaporating to separate out sodium chloride, thereby realizing the separation of sodium sulfate and sodium chloride;
step S3: performing brine refining treatment on the sodium chloride salt slurry (located in the sodium chloride salt slurry preparation tank 3) obtained in the step S1 twice through a first brine refining tank 13 and a second brine refining tank 14 to obtain a saturated sodium chloride solution containing less calcium and magnesium impurities and a sodium sulfate component with a certain concentration, and feeding waste generated in the refining process into a waste treatment device 4;
step S4: adding the mother liquor in the step S1, the mirabilite salt slurry in the step S2 and the waste in the step S3 into a chemical separation tank 7 serving as a chemical separation device for treatment, adding a medicament to form a precipitate, discharging the precipitate into a sludge storage tank 8, further performing membrane separation on clear liquid generated by the chemical separation device through an inorganic membrane separation tank 15, and discharging concentrated liquid generated by the chemical separation device into the sludge storage tank 8;
step S5: the sludge in the sludge storage tank 8 is centrifugally separated by the centrifugal dehydrator 9, solid gypsum sludge and residual liquid are obtained after centrifugal treatment, and the residual liquid is returned to the step S1 again for treatment.
The crystallizer 11 adopts high-vacuum low-boiling point evaporation, and can use dead steam or waste flue gas or a low-heat-value heat source to reduce the operation cost.
Sodium sulfate and sodium chloride are separated by adopting a thermal method through the difference of the solubility characteristics of the sodium chloride and the sodium sulfate, and halogen brine meeting the requirements of a sodium chloride brine refining and electrolyzing device is formed in the crystal incubator, in the embodiment, the electrolyzing device is a sodium chloride electrolytic tank 6, and high-temperature unsaturated sodium chloride in the nitrate evaporator 2 also flows back to the crystal incubator so as to improve the evaporating capacity of the crystal incubator.
An upper-layer mother liquor annular discharge pipe is arranged in the crystal incubator and is used for discharging salt slurry rich in calcium and magnesium.
The product of the first brine refining treatment is refined by chelating resin to produce brine with impurities meeting the requirements of a direct current electrolytic cell (namely a sodium chloride electrolytic cell 6), and hydrogen, chlorine and saturated sodium hydroxide are produced by electrolysis.
And discharging mother liquor generated by the crystal incubator, mirabilite salt slurry generated by the nitrate evaporator 2, precipitate generated by the primary brine refining treatment and regeneration waste liquid generated by the secondary brine refining treatment to a waste treatment device 4.
The special compound medicament is a flocculant for high-salinity water precipitation compounded by polyferric oxide and aluminium oxide powder, can play a better role in precipitation separation, and solves the problem that high-salinity high-hardness flocculation precipitation is difficult to separate.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (3)
1. The utility model provides a low-cost reuse of reclaimed water strong brine resourceization zero release processing apparatus which characterized in that includes:
the reclaimed water storage tank is used for storing and collecting reclaimed water reuse strong brine;
the crystallizer is connected with the reclaimed water storage tank and is used for carrying out crystallization treatment on reclaimed water reuse strong brine to crystallize out most sodium chloride salt slurry and obtain mother liquor rich in sodium sulfate;
the sodium chloride solution is dissolved into an unsaturated solution, and the residual heated sodium chloride in the sodium chloride evaporator is introduced into the crystallizer again;
the waste treatment device is connected with the crystallizer and is used for receiving the mirabilite slurry generated by the mirabilite evaporator through a mirabilite slurry preparation tank;
the brine refining treatment device is connected with the crystallizer and is used for carrying out brine refining treatment on the sodium chloride salt slurry generated by the crystallizer to obtain a saturated sodium chloride solution with less calcium and magnesium impurities and still containing a sodium sulfate component with a certain concentration;
a chemical separation device for treating the mother liquor and the mirabilite salt slurry to form a precipitate;
the sludge storage tank is used for collecting the sediments generated by the chemical separation device;
the inorganic membrane separation tank is used for carrying out inorganic membrane separation on the clear liquid generated by the chemical separation device;
and the centrifugal dehydrator is used for performing centrifugal separation on the sludge in the sludge storage tank.
2. The low-cost reclaimed water reuse concentrated brine resource zero-emission treatment device according to claim 1, characterized in that: the brine refining treatment device comprises a sodium chloride salt slurry preparation tank for receiving the sodium chloride salt slurry, a sodium chloride electrolytic tank, a first brine refining tank and a second brine refining tank.
3. The low-cost reclaimed water reuse concentrated brine resource zero-emission treatment device according to claim 1, characterized in that: the chemical separation device is a chemical separation tank.
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| CN202123039127.9U CN216273587U (en) | 2021-12-06 | 2021-12-06 | Low-cost reuse of reclaimed water strong brine resourceful zero release processing apparatus |
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| CN202123039127.9U CN216273587U (en) | 2021-12-06 | 2021-12-06 | Low-cost reuse of reclaimed water strong brine resourceful zero release processing apparatus |
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