CN216513295U - Sewage and wastewater zero-discharge treatment system - Google Patents
Sewage and wastewater zero-discharge treatment system Download PDFInfo
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Abstract
A sewage and wastewater zero discharge treatment system is characterized in that a raw water adjusting tank is connected with a pretreatment assembly through a raw water conveying pipeline; the pretreatment component is connected with the membrane treatment component through a conveying pipeline; the membrane processing assembly is connected with the evaporative crystallization assembly through a conveying pipeline; the evaporation crystallization component is connected with the bipolar membrane electrodialysis component through a conveying pipeline; the bipolar membrane electrodialysis assembly is connected with the pretreatment assembly through a produced water return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly is connected with a hydrochloric acid tank through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly is connected with a sulfuric acid tank through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly is connected with a sodium hydroxide tank through a conveying pipeline; the sodium carbonate tank is communicated with a gas outlet of the pretreatment component through a conveying pipeline, and the sodium hydroxide tank is communicated with the sodium carbonate tank through a conveying pipeline. The utility model can realize the recycling of the medicament in the zero discharge treatment process of the sewage and the wastewater, and simultaneously effectively utilize the generated by-products as resources, thereby reducing the operation cost.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage and wastewater zero-discharge treatment system.
Background
With the rapid development of the industrialization process, the discharge amount of coal mine water, coal chemical wastewater, steel coking wastewater, landfill leachate, municipal sewage and other wastewater is continuously increased, so that the water environment is seriously polluted, the strategic requirements of sustainable development and increasingly strict environmental protection policies are adhered to, and the treatment of the sewage and the wastewater is reluctant.
At present, technologies such as concentration and decrement, zero emission, chemical neutralization and precipitation and the like are mainly included in the water treatment industry, at the present stage, the water treatment technology is more and more prone to select a zero emission scheme, and a main problem in the zero emission scheme is the control of operation cost.
In the operation process of the zero-emission system, the medicament cost is an important component in the system operation cost, the medicament is used for softening, membrane cleaning and other processes, wherein the medicament with higher cost comprises sulfuric acid, hydrochloric acid, sodium hydroxide and sodium carbonate, and the medicament cost of the part accounts for more than 60 percent of the total medicament cost of the system. In addition, the sludge (mainly containing calcium carbonate and magnesium hydroxide) and inorganic salts (sodium sulfate, sodium chloride and other miscellaneous salts) generated in the zero discharge process need to be treated, the common treatment mode of the sludge is generally landfill treatment, and certain sludge treatment cost is required; salt is generally sold or landfilled, but the profitability of salt selling is very little compared with the reduction of the operation cost of the whole process. If the purchased amount of the medicament can be reduced and the generated by-products can be effectively recycled, the cost of the whole operation process can be reduced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a sewage and wastewater zero-discharge treatment system, which solves the problems of high operation cost and difficult disposal of byproducts in sewage and wastewater zero-discharge treatment.
The technical scheme for solving the technical problems is as follows: a sewage and wastewater zero-discharge treatment system comprises a raw water regulating tank, a pretreatment component, a membrane treatment component, an evaporation crystallization component, a bipolar membrane electrodialysis component, a hydrochloric acid tank, a sulfuric acid tank, a sodium hydroxide tank and a sodium carbonate tank;
the raw water regulating tank is connected with the pretreatment assembly through a raw water conveying pipeline; the pretreatment assembly is connected with the membrane treatment assembly through a conveying pipeline; the membrane processing assembly is connected with the evaporative crystallization assembly through a conveying pipeline; the evaporative crystallization assembly is connected with the bipolar membrane electrodialysis assembly through a conveying pipeline;
the bipolar membrane electrodialysis assembly is connected with the pretreatment assembly through a water production return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly is connected with the hydrochloric acid tank through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly is connected with the sulfuric acid tank through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly is connected with the sodium hydroxide tank through a conveying pipeline;
the sodium carbonate tank is communicated with a gas outlet of the pretreatment assembly through a conveying pipeline, and the sodium hydroxide tank is communicated with the sodium carbonate tank through a conveying pipeline.
As a preferable scheme of the sewage and wastewater zero-discharge treatment system, the pretreatment component adopts at least one of a V-shaped filter tank, a sand filter, a fiber filter, a cartridge filter, a high-density tank, a destabilization crystallizer, an ion exchanger and a carbon remover.
As the preferable scheme of the sewage and wastewater zero-discharge treatment system, the membrane treatment component adopts a reverse osmosis membrane concentration component and a nanofiltration membrane component;
the reverse osmosis membrane concentration component adopts a rolled reverse osmosis membrane, a disc tube type reverse osmosis membrane or a flat plate type reverse osmosis membrane;
the nanofiltration membrane component adopts a rolled nanofiltration membrane or a flat nanofiltration membrane.
As the preferable scheme of the sewage and wastewater zero-discharge treatment system, the system further comprises a water production tank, and the membrane treatment component and the evaporation crystallization component are both connected to the water production tank through conveying pipelines.
The sewage zero-discharge treatment system also comprises a sludge tank, wherein a sludge discharge port of the pretreatment assembly is connected with the sludge tank through a conveying pipeline;
the sludge tank is connected with a sludge discharge pipeline and a byproduct output pipeline.
As a preferred scheme of the sewage and wastewater zero-discharge treatment system, the byproduct output pipeline is provided with a magnesium sulfate tank, a calcium sulfate tank or a pulverized coal tank; the magnesium sulfate tank is communicated with a conveying pipeline between the raw water regulating tank and the pretreatment assembly through a magnesium sulfate recycling pipeline.
As the preferable scheme of the sewage and wastewater zero-discharge treatment system, the sulfuric acid tank is communicated with the sludge tank through a first sulfuric acid recycling pipeline, and the sulfuric acid tank is communicated with the conveying pipeline between the raw water regulating tank and the pretreatment component through a second sulfuric acid recycling pipeline.
As a preferred scheme of the sewage and wastewater zero-discharge treatment system, the hydrochloric acid tank is communicated with the membrane treatment component through a first hydrochloric acid recycling pipeline; the hydrochloric acid tank is communicated with a conveying pipeline between the raw water regulating reservoir and the pretreatment assembly through a second hydrochloric acid recycling pipeline.
As a preferable scheme of the sewage and wastewater zero-discharge treatment system, the sodium hydroxide tank is communicated with the membrane treatment component through a first sodium hydroxide recycling pipeline; and the sodium hydroxide tank is communicated with a conveying pipeline between the raw water regulating tank and the pretreatment assembly through a second sodium hydroxide recycling pipeline.
As the preferable scheme of the sewage and wastewater zero-discharge treatment system, the sodium carbonate tank is communicated with the conveying pipeline between the raw water regulating reservoir and the pretreatment component through a sodium carbonate recycling pipeline.
The utility model has the beneficial effects that the device is provided with a raw water regulating tank, a pretreatment component, a membrane treatment component, an evaporation crystallization component, a bipolar membrane electrodialysis component, a hydrochloric acid tank, a sulfuric acid tank, a sodium hydroxide tank and a sodium carbonate tank; the raw water regulating tank is connected with the pretreatment component through a raw water conveying pipeline; the pretreatment assembly is connected with the membrane treatment assembly through a conveying pipeline; the membrane processing assembly is connected with the evaporative crystallization assembly through a conveying pipeline; the evaporative crystallization assembly is connected with the bipolar membrane electrodialysis assembly through a conveying pipeline; the bipolar membrane electrodialysis assembly is connected with the pretreatment assembly through a water production return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly is connected with a hydrochloric acid tank through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly is connected with a sulfuric acid tank through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly is connected with a sodium hydroxide tank through a conveying pipeline; the sodium carbonate tank is communicated with a gas outlet of the pretreatment assembly through a conveying pipeline, and the sodium hydroxide tank is communicated with the sodium carbonate tank through a conveying pipeline. The utility model can realize the recycling of sulfuric acid, hydrochloric acid, sodium hydroxide and sodium carbonate in the zero discharge treatment process of sewage and wastewater, reduce the investment cost of medicaments, effectively utilize the generated by-products as resources and reduce the cost of the whole operation process of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic view of a wastewater zero-discharge treatment system provided in an embodiment of the utility model.
In the figure, 1, a raw water adjusting tank; 2. a pre-processing assembly; 3. a membrane treatment assembly; 4. evaporating the crystallization assembly; 5. a bipolar membrane electrodialysis assembly; 6. a hydrochloric acid tank; 7. a sulfuric acid tank; 8. a sodium hydroxide tank; 9. a sodium carbonate tank; 10. a water producing tank; 11. a sludge tank; 12. a sludge discharge pipeline; 13. a byproduct output line; 14. a magnesium sulfate tank; 15. a calcium sulfate tank; 16. a pulverized coal tank; 17. a magnesium sulfate recycling pipeline; 18. a first sulfuric acid recycling pipeline; 19. a second sulfuric acid recycling pipeline; 20. a first hydrochloric acid recycling pipeline; 21. a second hydrochloric acid recycling pipeline; 22. a first sodium hydroxide recycling pipeline; 23. a second sodium hydroxide recycling pipeline; 24. sodium carbonate recycling pipeline.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a sewage and wastewater zero-discharge treatment system is provided, which comprises a raw water regulating reservoir 1, a pretreatment module 2, a membrane treatment module 3, an evaporation crystallization module 4, a bipolar membrane electrodialysis module 5, a hydrochloric acid tank 6, a sulfuric acid tank 7, a sodium hydroxide tank 8 and a sodium carbonate tank 9;
the raw water regulating tank 1 is connected with the pretreatment component 2 through a raw water conveying pipeline; the pretreatment assembly 2 is connected with the membrane treatment assembly 3 through a conveying pipeline; the membrane processing assembly 3 is connected with the evaporative crystallization assembly 4 through a conveying pipeline; the evaporative crystallization assembly 4 is connected with the bipolar membrane electrodialysis assembly 5 through a conveying pipeline;
the bipolar membrane electrodialysis assembly 5 is connected with the pretreatment assembly 2 through a water production return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly 5 is connected with the hydrochloric acid tank 6 through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly 5 is connected with the sulfuric acid tank 7 through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly 5 is connected with the sodium hydroxide tank 8 through a conveying pipeline;
the sodium carbonate tank 9 is communicated with a gas outlet of the pretreatment assembly 2 through a conveying pipeline, and the sodium hydroxide tank 8 is communicated with the sodium carbonate tank 9 through a conveying pipeline.
In this embodiment, the pretreatment module 2 is at least one of a V-shaped filter, a sand filter, a fiber filter, a cartridge filter, a high-density tank, a destabilizing crystallizer, an ion exchanger and a decarbonizer. It is preferable to use a combination of a high density tank, an ion exchanger and a carbon remover. The membrane treatment component 3 adopts a reverse osmosis membrane concentration component and a nanofiltration membrane component; the reverse osmosis membrane concentration component adopts a rolled reverse osmosis membrane, a disc tube type reverse osmosis membrane or a flat plate type reverse osmosis membrane; the nanofiltration membrane component adopts a rolled nanofiltration membrane or a flat nanofiltration membrane.
In the embodiment, the device further comprises a water production tank 10, and the membrane treatment assembly 3 and the evaporative crystallization assembly 4 are connected to the water production tank 10 through conveying pipelines. In addition, the device also comprises a sludge tank 11, and a sludge discharge port of the pretreatment assembly 2 is connected with the sludge tank 11 through a conveying pipeline; the sludge tank 11 is connected with a sludge discharge pipeline 12 and a byproduct output pipeline 13. The byproduct output pipeline 13 is provided with a magnesium sulfate tank 14, a calcium sulfate tank 15 or a coal dust tank 16, wherein when the wastewater type is coal mine water, the coal dust tank 16 is additionally arranged; the magnesium sulfate tank 14 is communicated with a conveying pipeline between the raw water regulating reservoir 1 and the pretreatment module 2 through a magnesium sulfate recycling pipeline 17. The sulfuric acid tank 7 is communicated with the sludge tank 11 through a first sulfuric acid recycling pipeline 18, and the sulfuric acid tank 7 is communicated with a conveying pipeline between the raw water adjusting tank 1 and the pretreatment component 2 through a second sulfuric acid recycling pipeline 19. The hydrochloric acid tank 6 is communicated with the membrane treatment component 3 through a first hydrochloric acid recycling pipeline 20; the hydrochloric acid tank 6 is communicated with a conveying pipeline between the raw water regulating reservoir 1 and the pretreatment module 2 through a second hydrochloric acid recycling pipeline 21. The sodium hydroxide tank 8 is communicated with the membrane treatment component 3 through a first sodium hydroxide recycling pipeline 22; the sodium hydroxide tank 8 is communicated with a conveying pipeline between the raw water regulating tank 1 and the pretreatment component 2 through a second sodium hydroxide recycling pipeline 23. The sodium carbonate tank 9 is communicated with a conveying pipeline between the raw water regulating reservoir 1 and the pretreatment component 2 through a sodium carbonate recycling pipeline 24.
In this embodiment, raw water in the raw water adjusting tank 1 is pretreated by the pretreatment module 2 to obtain pretreated effluent, sludge is generated under the action of the addition of the reagent, sulfuric acid is added to the sludge, and calcium carbonate and magnesium hydroxide in the sludge can chemically react with the sulfuric acid to generate calcium sulfate and magnesium sulfate.
Specifically, in the pretreatment module 2, the sulfuric acid added into the sludge generated in the high-density tank comes from the sulfuric acid prepared by the bipolar membrane electrodialysis module 5, and calcium carbonate components in the sludge react with the sulfuric acid to generate calcium sulfate (CaCO)3+H2SO4→CaSO4+H2O+CO2) The magnesium hydroxide component reacts with sulfuric acid to form magnesium sulfate (Mg (OH)2+H2SO4→MgSO4+2H2And O), separating and purifying the calcium sulfate and the magnesium sulfate to obtain a gypsum product and a magnesium sulfate heptahydrate product. The gypsum can be sold for disposal; the magnesium sulfate heptahydrate can be used as a medicament except silicon in the pretreatment component 2 for recycling, and the rest part can be sold for disposal; and performing landfill treatment on other components left in the sludge.
Specifically, the gas outlet of the carbon remover in the pretreatment module 2 is connected with a sodium carbonate tank 9, and part of hydrogen is introduced from a sodium hydroxide tank 8Sodium oxide solution is put into a sodium carbonate tank 9, and CO blown out by a carbon remover2Can react with sodium hydroxide prepared by the bipolar membrane electrodialysis component 5 to generate sodium carbonate (2 NaOH + CO)2→Na2CO3+H2O) as softening agent for the pre-treatment assembly 2.
Specifically, the produced water of the pretreatment component 2 enters the membrane treatment component 3 for concentration treatment, the reverse osmosis produced water enters a reuse water pool, and the reverse osmosis concentrated water enters the next system. The reverse osmosis concentrated water enters a nanofiltration membrane component for further concentration so as to realize the purpose of salt separation, and the concentrated produced water and concentrated water of the nanofiltration membrane are obtained.
Specifically, the produced water and the concentrated water of the nanofiltration membrane component respectively enter the evaporation crystallization component 4 for evaporation, crystallization and drying treatment to obtain sodium chloride and sodium sulfate solid salt.
Specifically, the reverse osmosis membrane concentration component is divided into different stages according to the water quality requirements of inlet water and produced water. The produced water of the reverse osmosis membrane concentration component is discharged into a reuse water tank, and a concentrated water outlet is connected with a water inlet of the nanofiltration membrane component. The nanofiltration membrane component is divided into different stages according to the water quality requirements of inlet water and produced water, whether further reverse osmosis concentration treatment is needed after passing through the nanofiltration membrane component is determined according to the water quality of the produced water of the nanofiltration membrane component, the nanofiltration membrane component concentrates the TDS of the produced water to about 100000mg/L, and the water outlet of the nanofiltration membrane component is connected with the water inlet of the sodium chloride evaporative crystallization unit; the nanofiltration membrane component concentrates the TDS of the concentrated water to about 160000mg/L, and a concentrated water port of the nanofiltration membrane component is connected with a water inlet of the sodium sulfate evaporation crystallization unit.
Specifically, sodium chloride and sodium sulfate solid salt are dissolved to prepare a salt solution with a certain concentration, the salt solution enters the bipolar membrane electrodialysis assembly 5 after being dissolved, the sodium chloride solution entering the bipolar membrane electrodialysis assembly 5 is converted into hydrochloric acid and a sodium hydroxide solution under the action of the bipolar membrane, the sodium sulfate solution is converted into sulfuric acid and a sodium hydroxide solution, and water produced by the bipolar membrane electrodialysis assembly 5 flows back to the pretreatment assembly 2. The sodium hydroxide solution prepared by the bipolar membrane electrodialysis assembly 5 is used for alkali washing of the membrane treatment assembly 3 and regeneration of ion exchange resin in the ion exchanger, and is used as a softening agent for the pretreatment assembly 2.
Calcium ions contained in the pretreatment water can generate calcium hydroxide in the water by adding the prepared sodium hydroxide solution, so that the purchased amount of lime is reduced. CO generated after stripping in a carbon remover in the pretreatment component 22Introducing into sodium hydroxide solution, chemically reacting to obtain sodium carbonate solution, and blowing off CO2The deficiency can be supplemented additionally by the use of a sodium carbonate solution as softening agent for the pretreatment module 2. The hydrochloric acid solution is used for acid washing of the membrane treatment component 3 and regeneration of ion exchange resin in the ion exchanger; the sulfuric acid solution is used for pH adjustment of the pretreatment assembly 2 and dosing of sludge treatment.
Specifically, the sodium chloride solution and the sodium sulfate solution are introduced into the bipolar membrane electrodialysis assembly 5 to be converted into a sodium hydroxide solution, a hydrochloric acid solution and a sulfuric acid solution, and the sodium hydroxide solution, the hydrochloric acid solution and the sulfuric acid solution are respectively introduced into a sodium hydroxide tank 8, a hydrochloric acid tank 6 and a sulfuric acid tank 7. The sodium hydroxide solution is used for the regeneration of the softening agent and the ion exchange resin in the pretreatment component 2 and the cleaning agent of the membrane treatment component 3; hydrochloric acid is used for regenerating ion exchange resin of the pretreatment module 2 and cleaning agent of the membrane treatment module 3; the sulfuric acid is used for pH adjustment and sludge resource utilization in the pretreatment assembly 2. And the water outlet of the bipolar membrane electrodialysis assembly 5 flows back to the water inlet of the pretreatment assembly 2.
In conclusion, the device is provided with a raw water regulating tank 1, a pretreatment module 2, a membrane treatment module 3, an evaporation crystallization module 4, a bipolar membrane electrodialysis module 5, a hydrochloric acid tank 6, a sulfuric acid tank 7, a sodium hydroxide tank 8 and a sodium carbonate tank 9; the raw water regulating tank 1 is connected with the pretreatment component 2 through a raw water conveying pipeline; the pretreatment component 2 is connected with the membrane treatment component 3 through a conveying pipeline; the membrane processing component 3 is connected with the evaporative crystallization component 4 through a conveying pipeline; the evaporative crystallization assembly 4 is connected with the bipolar membrane electrodialysis assembly 5 through a conveying pipeline; the bipolar membrane electrodialysis assembly 5 is connected with the pretreatment assembly 2 through a produced water return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly 5 is connected with a hydrochloric acid tank 6 through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly 5 is connected with a sulfuric acid tank 7 through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly 5 is connected with a sodium hydroxide tank 8 through a conveying pipeline; the sodium carbonate tank 9 is communicated with a gas outlet of the pretreatment component 2 and hydrogen through a conveying pipelineThe sodium oxide tank 8 is communicated with a sodium carbonate tank 9 through a conveying pipeline. After raw water enters the pretreatment component 2, sludge is generated under the action of a medicament, the pretreated raw water enters a reverse osmosis concentration component of the membrane treatment component 3 for concentration, reverse osmosis concentrated water enters a nanofiltration membrane component for further concentration and salt separation, produced water and concentrated water respectively enter the evaporative crystallization component 4 to obtain sodium chloride and sodium sulfate, the sodium chloride and the sodium sulfate are prepared into a solution and then introduced into the bipolar membrane electrodialysis component 5 to be converted into an acid-base solution, so that the recycling of the medicament needed by the system is realized, acid liquor generated by the bipolar membrane electrodialysis component 5 can be used as a medicament for recycling sludge, and the sludge is converted into calcium sulfate and magnesium sulfate for sale or reuse. In the pretreatment assembly 2, softened sludge generated in a high-density tank is temporarily stored in a sludge temporary storage tank and then transferred to a sludge tank 11, sulfuric acid is added into the sludge tank 11, and the sulfuric acid reacts with the sludge to generate calcium sulfate and magnesium sulfate. In the pretreatment component 2, the sulfuric acid added into the sludge generated by the high-density tank comes from the sulfuric acid prepared by the bipolar membrane electrodialysis component 5, and calcium carbonate components in the sludge react with the sulfuric acid to generate calcium sulfate (CaCO)3+H2SO4→CaSO4+H2O+CO2) The magnesium hydroxide component reacts with sulfuric acid to form magnesium sulfate (Mg (OH)2+H2SO4→MgSO4+2H2And O), separating and purifying the calcium sulfate and the magnesium sulfate to obtain a gypsum product and a magnesium sulfate heptahydrate product. The gypsum can be sold for disposal; the magnesium sulfate heptahydrate can be used as a medicament except silicon in a pretreatment system for recycling, and the rest part can be sold for disposal; and performing landfill treatment on other components left in the sludge. The utility model can realize the recycling of sulfuric acid, hydrochloric acid, sodium hydroxide and sodium carbonate in the zero discharge treatment process of sewage and wastewater, reduce the investment cost of medicaments, effectively utilize the generated by-products as resources and reduce the cost of the whole operation process of the system.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A sewage and wastewater zero-discharge treatment system is characterized by comprising a raw water regulating reservoir (1), a pretreatment component (2), a membrane treatment component (3), an evaporation crystallization component (4), a bipolar membrane electrodialysis component (5), a hydrochloric acid tank (6), a sulfuric acid tank (7), a sodium hydroxide tank (8) and a sodium carbonate tank (9);
the raw water adjusting tank (1) is connected with the pretreatment component (2) through a raw water conveying pipeline; the pretreatment assembly (2) is connected with the membrane treatment assembly (3) through a conveying pipeline; the membrane processing assembly (3) is connected with the evaporative crystallization assembly (4) through a conveying pipeline; the evaporative crystallization assembly (4) is connected with the bipolar membrane electrodialysis assembly (5) through a conveying pipeline;
the bipolar membrane electrodialysis assembly (5) is connected with the pretreatment assembly (2) through a water production return pipeline; a hydrochloric acid outlet of the bipolar membrane electrodialysis assembly (5) is connected with the hydrochloric acid tank (6) through a conveying pipeline, a sulfuric acid outlet of the bipolar membrane electrodialysis assembly (5) is connected with the sulfuric acid tank (7) through a conveying pipeline, and a sodium hydroxide solution outlet of the bipolar membrane electrodialysis assembly (5) is connected with the sodium hydroxide tank (8) through a conveying pipeline;
the sodium carbonate tank (9) is communicated with a gas outlet of the pretreatment assembly (2) through a conveying pipeline, and the sodium hydroxide tank (8) is communicated with the sodium carbonate tank (9) through a conveying pipeline.
2. The zero discharge sewage and wastewater treatment system according to claim 1, wherein the pretreatment module (2) adopts at least one of a V-shaped filter, a sand filter, a fiber filter, a cartridge filter, a high density tank, a destabilizing crystallizer, an ion exchanger and a decarbonizer.
3. The zero-discharge sewage and wastewater treatment system according to claim 1, wherein the membrane treatment module (3) adopts a reverse osmosis membrane concentration module and a nanofiltration membrane module;
the reverse osmosis membrane concentration component adopts a rolled reverse osmosis membrane, a disc tube type reverse osmosis membrane or a flat plate type reverse osmosis membrane;
the nanofiltration membrane component adopts a roll nanofiltration membrane or a flat nanofiltration membrane.
4. The zero discharge treatment system for sewage and wastewater according to claim 1, further comprising a water production tank (10), wherein the membrane treatment module (3) and the evaporative crystallization module (4) are connected to the water production tank (10) through a conveying pipeline.
5. The zero discharge treatment system for wastewater and sewage as claimed in claim 1, further comprising a sludge tank (11), wherein the sludge discharge port of the pretreatment module (2) is connected with the sludge tank (11) through a conveying pipeline;
the sludge tank (11) is connected with a sludge discharge pipeline (12) and a byproduct output pipeline (13).
6. The zero discharge treatment system for sewage and wastewater according to claim 5, wherein the by-product output pipeline (13) is configured with a magnesium sulfate tank (14), a calcium sulfate tank (15) or a pulverized coal tank (16); the magnesium sulfate tank (14) is communicated with a conveying pipeline between the raw water regulating tank (1) and the pretreatment assembly (2) through a magnesium sulfate recycling pipeline (17).
7. The zero discharge treatment system for sewage and wastewater according to claim 5, characterized in that the sulfuric acid tank (7) is communicated with the sludge tank (11) through a first sulfuric acid recycling pipeline (18), and the sulfuric acid tank (7) is communicated with a conveying pipeline between the raw water adjusting tank (1) and the pretreatment module (2) through a second sulfuric acid recycling pipeline (19).
8. The zero discharge treatment system for sewage and wastewater according to claim 7, characterized in that the hydrochloric acid tank (6) is communicated with the membrane treatment module (3) through a first hydrochloric acid recycling pipeline (20); the hydrochloric acid tank (6) is communicated with a conveying pipeline between the raw water regulating reservoir (1) and the pretreatment assembly (2) through a second hydrochloric acid recycling pipeline (21).
9. The zero discharge treatment system for wastewater and sewage according to claim 8, wherein the sodium hydroxide tank (8) is communicated with the membrane treatment module (3) through a first sodium hydroxide recycling pipeline (22); and the sodium hydroxide tank (8) is communicated with a conveying pipeline between the raw water regulating tank (1) and the pretreatment assembly (2) through a second sodium hydroxide recycling pipeline (23).
10. The sewage and wastewater zero discharge treatment system according to claim 9, wherein the sodium carbonate tank (9) is communicated with the conveying pipeline between the raw water adjusting tank (1) and the pretreatment module (2) through a sodium carbonate recycling pipeline (24).
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