CN114906957A - Concentrated brine recycling treatment method and treatment system - Google Patents
Concentrated brine recycling treatment method and treatment system Download PDFInfo
- Publication number
- CN114906957A CN114906957A CN202210629341.XA CN202210629341A CN114906957A CN 114906957 A CN114906957 A CN 114906957A CN 202210629341 A CN202210629341 A CN 202210629341A CN 114906957 A CN114906957 A CN 114906957A
- Authority
- CN
- China
- Prior art keywords
- brine
- solution
- treatment
- sodium hydroxide
- hydroxide solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012267 brine Substances 0.000 title claims abstract description 101
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004064 recycling Methods 0.000 title claims abstract description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 144
- 239000000243 solution Substances 0.000 claims abstract description 91
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 68
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 60
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 56
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 52
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 34
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 28
- 238000000909 electrodialysis Methods 0.000 claims abstract description 26
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 26
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 26
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 24
- 239000011259 mixed solution Substances 0.000 claims abstract description 23
- 238000001728 nano-filtration Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 15
- 239000012528 membrane Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000000108 ultra-filtration Methods 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 23
- 150000003839 salts Chemical class 0.000 abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- 239000011780 sodium chloride Substances 0.000 abstract description 11
- 238000006386 neutralization reaction Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000004939 coking Methods 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- 238000010979 pH adjustment Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 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
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a concentrated brine recycling treatment method and a concentrated brine recycling treatment system, wherein the treatment method comprises the following steps: concentrating strong brine produced by wastewater treatment to ensure that the concentration of the strong brine reaches a preset value; removing metal ions in the strong brine; carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution; enabling a sodium hydroxide solution to contact with the desulfurized and denitrated flue gas, and enabling excessive carbon dioxide in the flue gas to perform chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate; carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution; the hydrochloric acid and sodium carbonate solution are collected for standby, and the sodium bicarbonate solution is returned to the sodium hydroxide solution to absorb the carbon dioxide in the flue gas. By adopting the treatment method, the generation of sodium chloride industrial salt is reduced, and simultaneously, the concentrated brine is utilized to produce the sodium hydroxide solution to absorb the carbon dioxide gas in the discharged flue gas, so that the carbon discharge is reduced, and carbon neutralization is formed.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a concentrated brine recycling treatment method and system.
Background
At present, a wastewater zero discharge process is gradually implemented in the chemical industry and the steel industry, in the wastewater zero discharge process, moisture in wastewater is recycled to process production after membrane treatment and evaporation condensation, salt in the wastewater is separated through a nanofiltration membrane and then is separated into high-purity sodium chloride concentrated water and sodium sulfate concentrated water, and then an industrial salt product is prepared in an evaporation crystallization mode and is sold for external use.
Although the quality of the produced salt can meet the requirement of primary industrial products, the salt is produced from waste water, so that the use of users has more worry, and the domestic yield of sodium chloride salt is excessive, so that most of the industrial salt of sodium chloride produced by zero emission is sold at ultralow price and is basically in an embarrassing situation of white delivery.
Disclosure of Invention
The invention aims to provide a concentrated brine recycling method and a concentrated brine recycling system, which not only reduce the generation of industrial salt of sodium chloride and the cost and sales volume of salt production, but also simultaneously utilize concentrated brine to produce sodium hydroxide solution in a recycling manner and absorb carbon dioxide gas in discharged flue gas, thereby reducing carbon emission and forming carbon neutralization.
In order to achieve the aim, the invention provides a method for recycling strong brine, which comprises the following steps:
concentrating strong brine produced by wastewater treatment to enable the concentration of the strong brine to reach a preset value;
removing metal ions in the strong brine;
carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution;
enabling the sodium hydroxide solution to contact with the flue gas subjected to desulfurization and denitrification, and enabling excessive carbon dioxide in the flue gas to perform chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
collecting the hydrochloric acid and the sodium carbonate solution for later use, and returning the sodium bicarbonate solution to the sodium hydroxide solution to absorb the carbon dioxide in the flue gas.
Optionally, the concentrated brine obtained by wastewater treatment is concentrated by electrodialysis or evaporation concentration process.
Optionally, the predetermined value is between 13% and 17%.
Optionally, the electrodialysis treatment is performed on the concentrated brine by using a bipolar membrane.
Optionally, after the electrodialysis treatment is performed on the concentrated brine, the concentrations of the produced hydrochloric acid and the produced sodium hydroxide solution are both between 6% and 8%.
Optionally, electrodialysis treatment is performed on the strong brine to produce weak brine.
Optionally, the weak brine has a concentration of less than 1%.
Optionally, before the nanofiltration treatment of the mixed solution, the method for recycling concentrated brine further comprises:
and pretreating the mixed solution by using an ultrafiltration membrane.
Optionally, removing metal ions from the concentrated brine by a chelating softening resin.
The invention also provides a concentrated brine recycling treatment system, which comprises:
the pretreatment system is used for concentrating strong brine produced by wastewater treatment, so that the concentration of the strong brine reaches a preset value, and removing metal ions in the strong brine;
the electrodialysis system is used for carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution;
the reaction system is used for enabling the sodium hydroxide solution to be in contact with the flue gas subjected to desulfurization and denitrification, and enabling excessive carbon dioxide in the flue gas to be in chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
the nanofiltration system is used for carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
and the recycling system is used for collecting the hydrochloric acid and the sodium carbonate solution for later use and returning the sodium bicarbonate solution to the sodium hydroxide solution so as to absorb the carbon dioxide in the flue gas.
The invention provides a concentrated brine recycling treatment method and a concentrated brine recycling treatment system, which at least have one of the following beneficial effects:
1) the concentrated brine is treated to generate hydrochloric acid and a sodium hydroxide solution, the hydrochloric acid can be used for pH adjustment in the cold rolling wastewater treatment process and regeneration of various softened resins, the sodium hydroxide solution can be used for reacting with carbon dioxide in desulfurization and denitrification flue gas to obtain a sodium carbonate solution, and the sodium carbonate solution can be directly reused for chemical hardness removal and nitrification reaction for alkalinity supplement in coking wastewater treatment, so that the medicament cost of a steel plant is reduced;
2) the strong brine generated by wastewater treatment in the iron and steel plant is consumed, the generation of industrial salt of sodium chloride is reduced, and the cost and the sales volume of the produced salt are reduced;
3) the sodium chloride salt is recycled, and the carbon dioxide gas in the discharged flue gas is absorbed, so that the carbon emission is reduced, and carbon neutralization is formed.
Drawings
Those skilled in the art will appreciate that the drawings are provided for a better understanding of the invention and do not set forth any limitations on the scope of the invention. Wherein:
fig. 1 is a flowchart of a method for recycling concentrated brine according to an embodiment of the present invention.
Detailed Description
As mentioned in the background of the invention, in the chemical industry, the strong brine obtained after the zero discharge treatment of wastewater is generally prepared into industrial salt products by evaporation crystallization, which is not popular in export. In the steel industry, the consumption of acid liquor and alkali liquor is very large, for example, acid washing and alkali washing wastewater generated in the cold rolling production process and acid and alkali wastewater generated by regeneration of various resins are treated by adding a large amount of hydrochloric acid and liquid alkali to adjust the pH value, and then the acid and alkali wastewater can be discharged by a workshop after reaching the standard; and secondly, a large amount of sodium carbonate needs to be added to add alkalinity in the nitrification reaction of the coking wastewater and the hardness removal process of the cold rolling wastewater.
Based on the above, the invention aims to provide a concentrated brine recycling treatment method and a concentrated brine recycling treatment system, wherein a hydrochloric acid solution and a sodium hydroxide solution are produced after the concentrated brine is treated, the hydrochloric acid can be used for pH adjustment in the cold rolling wastewater treatment process and regeneration of various softening resins, and the sodium hydroxide solution can be used for reacting with carbon dioxide in desulfurization and denitrification flue gas to obtain a sodium carbonate solution which can be directly reused for chemical hardness removal and nitrification reaction alkalinity supplement in coking wastewater treatment. The method not only reduces the generation of industrial salt of sodium chloride and the cost and sales volume of salt production, but also recycles the salt of sodium chloride and absorbs carbon dioxide gas in the discharged flue gas, thereby reducing carbon emission and forming carbon neutralization.
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used herein, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. As used herein, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. The term "a plurality" as used herein is generally employed in the sense including "at least one" unless the content clearly dictates otherwise. The term "at least two" as used herein is generally employed in a sense including "two or more" unless the content clearly dictates otherwise. Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of the features.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for recycling concentrated brine according to an embodiment of the present invention. The embodiment provides a resource treatment method for concentrated brine, which comprises the following steps:
s1, concentrating strong brine produced by wastewater treatment to enable the concentration of the strong brine to reach a preset value;
s2, removing metal ions in the concentrated brine;
s3, carrying out electrodialysis treatment on the concentrated brine to produce hydrochloric acid and a sodium hydroxide solution;
s4, contacting the sodium hydroxide solution with the flue gas subjected to desulfurization and denitrification, and carrying out chemical reaction on excessive carbon dioxide in the flue gas and the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
s5, performing nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
s6, collecting the hydrochloric acid and the sodium carbonate solution for standby, and returning the sodium bicarbonate solution to the sodium hydroxide solution to absorb the carbon dioxide in the flue gas.
Firstly, step S1 is executed to perform concentration treatment on the strong brine produced by wastewater treatment so that the concentration of the strong brine reaches a predetermined value, and the strong brine is subjected to concentration treatment to obtain strong brine with a certain concentration, so that the desalting efficiency is higher when the strong brine is subjected to bipolar membrane electrodialysis treatment subsequently.
Preferably, the concentrated brine obtained by the wastewater treatment is concentrated by electrodialysis or evaporation concentration process.
Preferably, after the concentrated brine produced by wastewater treatment is concentrated, the concentration of the concentrated brine is between 13% and 17%.
Next, step S2 is performed to remove metal ions in the concentrated brine. The metal ions include, but are not limited to, calcium and magnesium ions.
Preferably, the metal ions in the concentrated brine are removed by a chelating softening resin. Because the salt content in the concentrated brine is high, the effect is not good when metal ions are adsorbed by common ion exchange resin, and the mechanism of metal ion adsorption of the chelate resin is that functional atoms on the resin and the metal ions are subjected to coordination reaction to form a stable structure similar to a micromolecule chelate.
Then, step S3 is performed to perform electrodialysis on the concentrated brine to produce hydrochloric acid and sodium hydroxide solution. In this embodiment, the bipolar membrane is used to perform electrodialysis treatment on the concentrated brine. H between the cathode and anode film composite layers under the action of DC electric field 2 Dissociation of O into H + And OH - And pass through the yin and yang membranes, respectively, as H + And OH - And (3) carrying out an ion source and carrying out a chemical reaction with sodium chloride in the concentrated saline to obtain hydrochloric acid and a sodium hydroxide solution. The hydrochloric acid can be used for pH adjustment in the cold rolling wastewater treatment process and regeneration of various softened resins.
In this embodiment, after the electrodialysis treatment is performed on the concentrated brine, the concentrations of the produced hydrochloric acid and the produced sodium hydroxide solution are both between 6% and 8%.
Furthermore, electrodialysis treatment is carried out on the strong brine, and then weak brine is produced.
Further, the weak brine has a concentration of less than 1%.
For example, when the concentration of the concentrated brine produced by the wastewater treatment is 13%, the concentrations of the hydrochloric acid and the sodium hydroxide solution produced by the electrodialysis of the concentrated brine are about 6%, and the concentration of the dilute brine is about 1%; after concentrated brine produced by wastewater treatment is concentrated, when the concentration of the concentrated brine is 15%, the concentrations of produced hydrochloric acid and sodium hydroxide solution are about 7% and the concentration of dilute brine is about 1% after the concentrated brine is subjected to electrodialysis treatment.
And step S4 is executed to contact the sodium hydroxide solution with the flue gas after desulfurization and denitrification, and the excess carbon dioxide in the flue gas and the sodium hydroxide solution undergo a chemical reaction to obtain a mixed solution of sodium bicarbonate and sodium carbonate. A large amount of flue gas is generated in the steel production process, the flue gas is subjected to desulfurization and denitrification treatment and then is discharged into the atmosphere, most of the flue gas is carbon dioxide, and a large amount of carbon is discharged, so that the excessive carbon dioxide in the flue gas is absorbed by a sodium hydroxide solution prepared from concentrated brine, the carbon discharge can be effectively reduced, and carbon neutralization is formed.
Preferably, after the step S4 is executed and before the step S5 is executed, the method for recycling concentrated brine further includes:
and pretreating the mixed solution by using an ultrafiltration membrane. The ultrafiltration membrane lintel precision is high, can be in mixed solution carries out preliminary filtration before the nanofiltration membrane, gets rid of suspended solid in the mixed solution to reduce the later maintenance cost of nanofiltration membrane and the change frequency of film element.
Then, steps S5-S6 are performed, the mixed solution is subjected to nanofiltration treatment, so as to obtain separated sodium bicarbonate solution and sodium carbonate solution, the hydrochloric acid and the sodium carbonate solution are collected for standby, and the sodium bicarbonate solution is returned to the sodium hydroxide solution to absorb the carbon dioxide in the flue gas. Excessive carbon dioxide in the flue gas reacts with a sodium hydroxide solution to be converted into a sodium carbonate solution (containing a small amount of sodium bicarbonate), the sodium carbonate solution enters a nanofiltration membrane after pretreatment of the ultrafiltration membrane, the sodium carbonate is trapped at a nanofiltration concentrated water side, and the bicarbonate solution enters a water production side through the nanofiltration membrane; the sodium carbonate solution on the concentrated water side can be directly reused for chemical hardness removal and alkalinity supplement in the coking wastewater treatment by nitration reaction, so that the medicament cost of steel plants is reduced, the sodium bicarbonate solution returns to the liquid alkali solution absorbed by the flue gas, the carbon dioxide is continuously absorbed and converted into sodium carbonate, and finally the resource utilization of the concentrated brine is completed.
Based on this, this embodiment still provides a strong brine resourceful treatment system, includes:
the pretreatment system is used for concentrating strong brine produced by wastewater treatment, so that the concentration of the strong brine reaches a preset value, and removing metal ions in the strong brine;
the electrodialysis system is used for carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution;
the reaction system is used for enabling the sodium hydroxide solution to be in contact with the flue gas subjected to desulfurization and denitrification, and enabling excessive carbon dioxide in the flue gas to be in chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
the nanofiltration system is used for carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
and the recycling system is used for collecting the hydrochloric acid and the sodium carbonate solution for later use and returning the sodium bicarbonate solution to the sodium hydroxide solution so as to absorb the carbon dioxide in the flue gas.
In summary, embodiments of the present invention provide a method and a system for recycling concentrated brine, in which concentrated brine is treated to generate hydrochloric acid and a sodium hydroxide solution, the hydrochloric acid can be used for PH adjustment and regeneration of various softening resins in a cold rolling wastewater treatment process, and the sodium hydroxide solution can be used for reacting with carbon dioxide in desulfurization and denitrification flue gas to obtain a sodium carbonate solution, and can be directly reused for chemical hardness removal and for supplementing alkalinity in a nitration reaction in coking wastewater treatment. The production of industrial salt of sodium chloride is reduced, the cost and the sales volume of the produced salt are reduced, and simultaneously, the salt content of the sodium chloride in the system is recycled, and carbon dioxide gas in the discharged flue gas is absorbed, so that the carbon emission is reduced, and carbon neutralization is formed.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A resource treatment method for strong brine is characterized by comprising the following steps:
concentrating strong brine produced by wastewater treatment to enable the concentration of the strong brine to reach a preset value;
removing metal ions in the strong brine;
carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution;
enabling the sodium hydroxide solution to contact with the flue gas subjected to desulfurization and denitrification, and enabling excessive carbon dioxide in the flue gas to perform chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
collecting the hydrochloric acid and the sodium carbonate solution for later use, and returning the sodium bicarbonate solution to the sodium hydroxide solution to absorb the carbon dioxide in the flue gas.
2. The method of claim 1 wherein the concentrated brine obtained from the wastewater treatment is concentrated by electrodialysis or evaporation concentration.
3. The method for resourceful treatment of concentrated brine according to claim 1, wherein the predetermined value is between 13% and 17%.
4. The method of claim 1 wherein the bipolar membrane is used to perform electrodialysis of the concentrated brine.
5. A concentrated brine resource treatment method as claimed in claim 4, wherein the concentrations of the produced hydrochloric acid and the produced sodium hydroxide solution are both between 6% and 8% after the concentrated brine is subjected to electrodialysis treatment.
6. A process for the reclamation of concentrated brine as claimed in claim 5, wherein the electrodialysis is carried out on the concentrated brine to produce a dilute brine.
7. A process for the reclamation of concentrated brine as claimed in claim 6, wherein the concentration of the dilute brine is less than 1%.
8. The method of claim 1, wherein prior to the nanofiltration of the mixed solution, the method further comprises:
and pretreating the mixed solution by using an ultrafiltration membrane.
9. The method of claim 1 wherein the removal of metal ions from the brine is accomplished by a chelating softening resin.
10. The utility model provides a strong brine resourceful treatment system which characterized in that includes:
the pretreatment system is used for concentrating strong brine produced by wastewater treatment, so that the concentration of the strong brine reaches a preset value, and removing metal ions in the strong brine;
the electrodialysis system is used for carrying out electrodialysis treatment on the strong brine to produce hydrochloric acid and a sodium hydroxide solution;
the reaction system is used for enabling the sodium hydroxide solution to be in contact with the flue gas subjected to desulfurization and denitrification, and enabling excessive carbon dioxide in the flue gas to be in chemical reaction with the sodium hydroxide solution to obtain a mixed solution of sodium bicarbonate and sodium carbonate;
the nanofiltration system is used for carrying out nanofiltration treatment on the mixed solution to obtain a separated sodium bicarbonate solution and a separated sodium carbonate solution;
and the recycling system is used for collecting the hydrochloric acid and the sodium carbonate solution for later use and returning the sodium bicarbonate solution to the sodium hydroxide solution so as to absorb the carbon dioxide in the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629341.XA CN114906957A (en) | 2022-05-31 | 2022-05-31 | Concentrated brine recycling treatment method and treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210629341.XA CN114906957A (en) | 2022-05-31 | 2022-05-31 | Concentrated brine recycling treatment method and treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114906957A true CN114906957A (en) | 2022-08-16 |
Family
ID=82770052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210629341.XA Pending CN114906957A (en) | 2022-05-31 | 2022-05-31 | Concentrated brine recycling treatment method and treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114906957A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382891A (en) * | 2022-09-05 | 2022-11-25 | 南京格洛特环境工程股份有限公司 | CO in household garbage incineration chelated fly ash 2 High quality utilization process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4428582B1 (en) * | 2009-06-17 | 2010-03-10 | 株式会社富士クリーン | Method and apparatus for producing acid and alkali from leachate |
| FR2998811A1 (en) * | 2012-12-03 | 2014-06-06 | Brgm | Method for absorption of atmospheric carbon dioxide in compensation of carbon dioxide emitted by e.g. thermal power plant, involves forming sodium carbonate solution, and retreating sodium carbonate solution and hydrochloric acid solution |
| CN105254084A (en) * | 2015-11-13 | 2016-01-20 | 北京国电富通科技发展有限责任公司 | Desulfurization waste water bipolar membrane electrodialysis treatment method and device |
| CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
| CN211004912U (en) * | 2019-10-29 | 2020-07-14 | 南京友智科技有限公司 | Wastewater treatment system |
| CN112675709A (en) * | 2020-12-07 | 2021-04-20 | 河北工业大学 | Bipolar membrane electrodialysis device and method for preparing alkali concentrated solution by seawater carbon sequestration |
| CN113244753A (en) * | 2021-05-18 | 2021-08-13 | 宝武水务科技有限公司 | Flue gas carbon dioxide recovery and resource utilization device and method |
| CN114380428A (en) * | 2021-11-02 | 2022-04-22 | 华陆工程科技有限责任公司 | High-concentration brine resource utilization system and method |
-
2022
- 2022-05-31 CN CN202210629341.XA patent/CN114906957A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4428582B1 (en) * | 2009-06-17 | 2010-03-10 | 株式会社富士クリーン | Method and apparatus for producing acid and alkali from leachate |
| FR2998811A1 (en) * | 2012-12-03 | 2014-06-06 | Brgm | Method for absorption of atmospheric carbon dioxide in compensation of carbon dioxide emitted by e.g. thermal power plant, involves forming sodium carbonate solution, and retreating sodium carbonate solution and hydrochloric acid solution |
| CN105254084A (en) * | 2015-11-13 | 2016-01-20 | 北京国电富通科技发展有限责任公司 | Desulfurization waste water bipolar membrane electrodialysis treatment method and device |
| CN110746008A (en) * | 2019-10-29 | 2020-02-04 | 南京友智科技有限公司 | Wastewater treatment system |
| CN211004912U (en) * | 2019-10-29 | 2020-07-14 | 南京友智科技有限公司 | Wastewater treatment system |
| CN112675709A (en) * | 2020-12-07 | 2021-04-20 | 河北工业大学 | Bipolar membrane electrodialysis device and method for preparing alkali concentrated solution by seawater carbon sequestration |
| CN113244753A (en) * | 2021-05-18 | 2021-08-13 | 宝武水务科技有限公司 | Flue gas carbon dioxide recovery and resource utilization device and method |
| CN114380428A (en) * | 2021-11-02 | 2022-04-22 | 华陆工程科技有限责任公司 | High-concentration brine resource utilization system and method |
Non-Patent Citations (1)
| Title |
|---|
| 吴梧桐, 中国医药科技出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382891A (en) * | 2022-09-05 | 2022-11-25 | 南京格洛特环境工程股份有限公司 | CO in household garbage incineration chelated fly ash 2 High quality utilization process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | Application of bipolar membrane electrodialysis for simultaneous recovery of high-value acid/alkali from saline wastewater: An in-depth review | |
| CN108689522A (en) | A kind of Treatment and recovery recovery method of photovoltaic industry nitration mixture waste water | |
| CN107188358A (en) | A kind of recycling treatment system, processing method and the application of high-concentration ammonium salt waste water | |
| CN110655258A (en) | Novel integrated treatment system and process for zero discharge of high-salinity wastewater in coal chemical industry | |
| CN111792776A (en) | Deep treatment and recycling method for concentrated water after heavy metal wastewater treatment | |
| WO1993002227A1 (en) | Process and apparatus for treating fluoride containing acid solutions | |
| CN107215996A (en) | A kind of recycling treatment system, processing method and the application of high concentration sodium salt waste water | |
| CN114906957A (en) | Concentrated brine recycling treatment method and treatment system | |
| CN103341321A (en) | Viscose sodium sulfate waste liquor acid and alkali recycling technology by virtue of bipolar membrane electrodialysis method | |
| CN219409508U (en) | High-salt film concentrated water treatment equipment | |
| CN211004912U (en) | Wastewater treatment system | |
| CN112079491A (en) | Recycling system for regenerated wastewater of multiple beds | |
| CN104860465A (en) | Double-tower catalysis thermal-coupling reflux deamination method and deamination device thereof | |
| CN217868418U (en) | Ammonia nitrogen wastewater treatment system | |
| CN203768157U (en) | Ion exchange resin regenerated waste water resource recycling system | |
| CN113830740B (en) | Method for preparing acid and alkali by bipolar membrane based on electrodialysis technology | |
| CN210796035U (en) | High salt water recycling system that polycrystalline silicon production process produced | |
| CN103224796B (en) | Method for preparing alkaline etching liquid by using constant boiling hydrochloric acid | |
| CN112479421A (en) | High-hardness wastewater softening and resource recycling system and method | |
| CN113087063A (en) | Method for deeply removing phosphorus in high-salinity wastewater | |
| CN116639769B (en) | Method and system for recycling polished waste acid | |
| CN115959643B (en) | Method for recycling byproduct phosphate and iron and steel pickling byproduct ferric salt | |
| RU2074122C1 (en) | Method of thermally desalting water | |
| CN216513295U (en) | Sewage and wastewater zero-discharge treatment system | |
| CN116752154A (en) | Method for recycling high-salt-content reclaimed water in lead-zinc smelting industry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220816 |