CN116102207A - Method for simultaneously recycling dyed brine and softened regenerated brine - Google Patents
Method for simultaneously recycling dyed brine and softened regenerated brine Download PDFInfo
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- CN116102207A CN116102207A CN202310104312.6A CN202310104312A CN116102207A CN 116102207 A CN116102207 A CN 116102207A CN 202310104312 A CN202310104312 A CN 202310104312A CN 116102207 A CN116102207 A CN 116102207A
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- brine
- dyed
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- 239000012267 brine Substances 0.000 title claims abstract description 142
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000004064 recycling Methods 0.000 title claims abstract description 30
- 150000003839 salts Chemical class 0.000 claims abstract description 27
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- 239000002244 precipitate Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000005273 aeration Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 239000011780 sodium chloride Substances 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- 238000004043 dyeing Methods 0.000 claims description 9
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 8
- 235000011152 sodium sulphate Nutrition 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000002585 base Substances 0.000 claims description 4
- 238000005374 membrane filtration Methods 0.000 claims description 4
- 230000008929 regeneration Effects 0.000 claims description 4
- 238000011069 regeneration method Methods 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 30
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 14
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 229920002401 polyacrylamide Polymers 0.000 abstract description 7
- 239000008394 flocculating agent Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 17
- 235000017550 sodium carbonate Nutrition 0.000 description 13
- 238000003756 stirring Methods 0.000 description 11
- 238000003113 dilution method Methods 0.000 description 9
- 239000006228 supernatant Substances 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 8
- 239000002351 wastewater Substances 0.000 description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 239000001110 calcium chloride Substances 0.000 description 4
- 229910001628 calcium chloride Inorganic materials 0.000 description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000001226 reprecipitation Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000985 reactive dye Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a method for simultaneously recycling dyed brine and softened regenerated brine, which comprises the following steps: (1) Mixing the dyed brine and the softened regenerated brine to obtain a mixed solution, adding alkali into the mixed solution, and uniformly mixing to obtain a mixed solution containing precipitate; (2) Rapidly separating the precipitate from the brine in the mixture containing the precipitate; (3) Adding acid liquor into the clear liquid obtained after separation in the step (2) to adjust the pH value to 3-4, aerating, and adding alkali to adjust the pH value to 6-9 after aeration is finished to obtain recovered brine. The method provided by the invention can realize simultaneous recycling of the salt in the dyed brine and the softened regenerated brine, and has the advantages of less dosage of treating agents such as flocculating agent, polyacrylamide, sodium carbonate and the like, low running cost, simple operation and the like compared with the conventional salt recycling process used in the field.
Description
Technical Field
The invention relates to a method for simultaneously recycling dyed brine and softened regenerated brine, belonging to the technical field of environmental protection and resource recovery.
Background
The reactive dye dyeing process needs a large amount of salt and sodium carbonate, and the salt and the sodium carbonate are discharged into a sewage plant along with the wastewater under normal conditions, so that the difficulty of sewage treatment and the burden of wastewater recycling are increased. At present, the technology for recycling the dyed brine in the field comprises solvent extraction, membrane filtration, advanced oxidation, coagulating sedimentation and other technologies, but the above procedures all require a large amount of acid to adjust the pH value and remove sodium carbonate in the dyed brine.
At present, a lot of printing and dyeing factories utilize softening resin to soften water, and a large amount of regenerated brine is generated in the use process of the water, and the wastewater has the characteristics of high salt concentration, particularly high calcium and magnesium concentration and the like. For the wastewater, part of plants directly discharge the wastewater into a sewage plant, and part of plants reuse the wastewater by adopting a double-alkali method. Wherein, the pH value of the wastewater is generally adjusted by sodium hydroxide or calcium hydroxide to remove magnesium salt, and sodium carbonate is used to precipitate calcium salt, so that the hardness of the regenerated brine treated by the double-alkali method can be reduced to below 150 mg/L. As can be seen, the double-alkali process requires the addition of large amounts of sodium carbonate and sodium hydroxide, and is costly to operate.
Therefore, providing a novel method for recycling dyed brine and softened regenerated brine simultaneously has become a technical problem in the art to be solved.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a method for recycling dyed brine and softened regenerated brine simultaneously.
In order to achieve the above object, the present invention provides a method for simultaneously recycling dyed brine and softened regenerated brine, wherein the method for simultaneously recycling dyed brine and softened regenerated brine comprises:
(1) Mixing the dyed brine and the softened regenerated brine to obtain a mixed solution, adding alkali into the mixed solution, and uniformly mixing to obtain a mixed solution containing precipitate;
(2) Rapidly separating the precipitate from the brine in the mixture containing the precipitate;
(3) Adding acid liquor into the clear liquid obtained after separation in the step (2) to adjust the pH value to 3-4, then aerating to blow off carbon dioxide formed by carbonate, and adding alkali to adjust the pH value to 6-9 after aeration is finished to obtain recovered brine.
As a specific embodiment of the method, the volume ratio of the dyed brine to the softened regenerated brine is 2:1-1:2.
As a specific embodiment of the above method of the present invention, in the step (1), a base is added to the mixed solution to adjust the pH to 11.5-12.5.
As a specific embodiment of the above method of the present invention, in the step (1), the alkali includes sodium hydroxide, calcium hydroxide, potassium hydroxide, or the like.
As a specific embodiment of the above method of the present invention, in the step (1), the uniform mixing may be achieved by rapid stirring.
As a specific embodiment of the above method of the present invention, in the step (2), the rapid separation includes precipitation, mechanical filtration, membrane filtration, centrifugation, or the like. Among these, precipitation, mechanical filtration, membrane filtration or centrifugation are all conventional rapid separation methods used in the art.
As a specific embodiment of the above method of the present invention, in the step (3), the acid solution includes sulfuric acid or hydrochloric acid, etc.
As a specific embodiment of the above method of the present invention, wherein in the step (3), the aeration time is 0.5 to 2 hours, preferably 1 hour.
As a specific embodiment of the above method of the present invention, in the step (3), the alkali includes sodium hydroxide, calcium hydroxide, potassium hydroxide, or the like.
As a specific embodiment of the above method of the present invention, wherein when the salt in the dyed brine is sodium chloride, the method further comprises directly recycling the recovered brine to the dyeing process and/or the softening resin regenerating process.
As a specific embodiment of the method, when the salt in the dyed brine is sodium sulfate, the method further comprises separating the salt from the recovered brine by using an NF membrane to obtain water and concentrated water, recycling the water to the softening resin regeneration process, and recycling the concentrated water to the dyeing process.
Wherein, the NF membrane is a conventional device, and salt separation operation by using the NF membrane is a conventional technical means in the field, and can be performed as required by a person skilled in the art.
The method provided by the invention can realize simultaneous recycling of the salt in the dyed brine and the softened regenerated brine, and has the advantages of less dosage of treating agents such as flocculating agent, polyacrylamide, sodium carbonate and the like, low running cost, simple operation and the like compared with the conventional salt recycling process used in the field.
Detailed Description
It should be noted that, in the description of the present invention and in the claims, the term "comprising" and any variations thereof, is intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
The "range" disclosed herein is given in the form of a lower limit and an upper limit. There may be one or more lower limits and one or more upper limits, respectively. The given range is defined by selecting a lower limit and an upper limit. The selected lower and upper limits define the boundaries of the particular ranges. All ranges defined in this way are combinable, i.e. any lower limit can be combined with any upper limit to form a range. For example, ranges of 60-120 and 80-110 are listed for specific parameters, with the understanding that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values listed are 1 and 2 and the maximum range values listed are 3,4 and 5, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.
In the present invention, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed throughout this disclosure, and "0-5" is only a shorthand representation of a combination of these values.
In the present invention, all the embodiments and preferred embodiments mentioned in the present invention may be combined with each other to form new technical solutions, unless otherwise specified.
In the present invention, all technical features mentioned in the present invention and preferred features may be combined with each other to form a new technical solution unless specifically stated otherwise.
In the present invention, the term "two" as used in the present specification means "at least two" unless specifically indicated.
In the present invention, all the steps mentioned herein may be performed sequentially or randomly, but are preferably performed sequentially, unless otherwise specified. For example, the method comprises steps (a) and (b), meaning that the method may comprise steps (a) and (b) performed sequentially, or may comprise steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), may include steps (a), (c) and (b), may include steps (c), (a) and (b), and the like.
The present invention will be described in further detail with reference to the accompanying drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. The following described embodiments are some, but not all, examples of the present invention and are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The embodiment provides a method for recycling dyed brine and softened regenerated brine simultaneously, wherein the method for recycling dyed brine and softened regenerated brine simultaneously comprises the following steps:
(a) Collecting the dyed brine and leading the dyed brine into a dyed brine collecting tank, wherein the pH value of the dyed brine is 11.5, the chromaticity is 2560 times (calculated by a dilution method), the sodium chloride concentration is 83g/L, and the sodium carbonate concentration is 21g/L; collecting softened backwash brine, namely softened regenerated brine, into a softened backwash brine collecting tank, wherein the concentration of sodium chloride in the softened backwash brine is 57g/L, and the total hardness (calcium chloride and magnesium chloride) is 12400mg/L;
(b) Mixing the dyed brine and the softened and regenerated brine according to the volume ratio of 1:1 to obtain a mixed solution, wherein the pH value of the mixed solution is 11.1, the hardness is 6200mg/L, the chromaticity is 1280 times (calculated by a dilution method), and the concentration of sodium chloride is 70g/L;
(c) Adding 1.1g/L sodium hydroxide into the mixed solution to adjust the pH value to 12.0, stirring for 5min at the speed of 200r/min to uniformly stir, wherein a large amount of precipitates (calcium carbonate, magnesium carbonate, calcium hydroxide, magnesium hydroxide and the like) appear in the mixed solution at the moment, so as to obtain a mixed solution containing the precipitates, and rapidly separating the precipitates and the salt water in the mixed solution containing the precipitates by a precipitation method;
taking the supernatant obtained by separation and measuring the chromaticity, wherein the chromaticity is 8 times (calculated by a dilution method), the removal rate is 99.4 percent, the calcium carbonate hardness is 85mg/L, and the removal rate is 98.6 percent;
(d) And (c) adding 1.5g/L hydrochloric acid into the supernatant obtained after the separation in the step (c) to adjust the pH value to 3.8 so as to remove residual carbonate ions, aerating for 1h, and adding 0.1g/L sodium hydroxide to adjust the pH value to 8.0 to obtain recovered brine with the alkalinity of 186mg/L.
Since the salt in the dyed brine used in this example is sodium chloride, the recovered brine can be directly reused for the dyeing process and/or the softening resin regenerating process.
Comparative example 1
This comparative example separately treats the dyed brine to recycle the salts therein, comprising the steps of:
collecting dyed brine and enabling the dyed brine to enter a dyed brine collecting tank, wherein the pH value of the dyed brine is 11.5, the chromaticity of the dyed brine is 2560 times (calculated by a dilution method), the concentration of sodium chloride is 83g/L, the concentration of sodium carbonate is 21g/L, 9g/L of flocculating agent (ferrous chloride) is added into the dyed brine collecting tank, stirring is carried out for 5min at 200r/min, 5mg/L of polyacrylamide is added, stirring is carried out for 30min, reprecipitation separation is carried out, the chromaticity of supernatant is measured to be 8 times, and the removal rate is 99.7%;
then adding 1.6g/L hydrochloric acid into a dyed brine collecting tank, adjusting the pH value to 3.8, aerating for 1h, and adding 0.1g/L sodium hydroxide to adjust the pH value to 8.0 to obtain recovered brine with the alkalinity of 168mg/L.
Comparative example 2
This comparative example separately treats the softened backwash brine to recycle salts therein, comprising the steps of:
collecting softened backwash brine, namely softened regenerated brine, into a softened backwash brine collecting tank, wherein the concentration of sodium chloride in the softened backwash brine is 57g/L, the total hardness (calcium chloride and magnesium chloride) is 12400mg/L, adding 10g/L of sodium carbonate into the softened backwash brine collecting tank, adding 2g/L of sodium hydroxide, regulating the pH value to 12.0, stirring for 30min at a speed of 200r/min, and then performing precipitation separation;
taking the supernatant obtained after separation, adding 1.5g/L hydrochloric acid into the supernatant to adjust the pH value to 4.0, aerating for 1h, adding 0.1g/L sodium hydroxide into the supernatant to adjust the pH value to 7.5, and obtaining recovered brine, wherein the alkalinity of the recovered brine is 205mg/L, the hardness is 96mg/L, and the removal rate is 99.2%.
Wherein the dyed brine and the softened regenerated brine were treated in combination in example 1, the dyed brine was treated alone in comparative example 1 and the softened backwashed brine was treated alone in comparative example 2, and the amounts of the agents in example 1 and comparative examples 1 to 2 are shown in Table 1 below.
TABLE 1
As can be seen from the above Table 1, the integrated treatment of the dyed brine and the softened regenerated brine in the embodiment 1 of the present invention can realize simultaneous recycling of the salt in the dyed brine and the softened regenerated brine, and compared with the treatment of the dyed brine and the softened backwashed brine in the comparative example 1 alone, the integrated treatment of the dyed brine and the softened regenerated brine in the embodiment 1 of the present invention does not require additional addition of flocculant, polyacrylamide and soda ash, and has the advantages of less treatment agent consumption, low running cost, simple operation, etc.
Example 2
The embodiment provides a method for recycling dyed brine and softened regenerated brine simultaneously, wherein the method for recycling dyed brine and softened regenerated brine simultaneously comprises the following steps:
(a) Collecting dyed brine into a dyed brine collecting tank, wherein the pH value of the dyed brine is 11.4, the chromaticity is 1280 times (calculated by dilution method), the sodium sulfate concentration is 60g/L, and the soda concentration is 15g/L; collecting softened backwash brine, namely softened regenerated brine, into a softened backwash brine collecting tank, wherein the concentration of sodium chloride in the softened backwash brine is 48g/L, and the total hardness (calcium chloride and magnesium chloride) is 17400mg/L;
(b) Mixing the dyed brine and the softened and regenerated brine according to the volume ratio of 1:1 to obtain a mixed solution, wherein the pH value of the mixed solution is 11.1, the hardness is 8700mg/L, the chromaticity is 640 times (calculated by a dilution method), the sodium sulfate concentration is 30g/L, and the sodium chloride concentration is 24g/L;
(c) Adding 1.3g/L sodium hydroxide into the mixed solution to adjust the pH value to 12.0, stirring for 5min at the speed of 200r/min to uniformly stir, wherein a large amount of precipitates (calcium carbonate, magnesium carbonate, calcium hydroxide, magnesium hydroxide and the like) appear in the mixed solution at the moment, so as to obtain a mixed solution containing the precipitates, and then rapidly separating the mixed solution by adopting a tubular membrane to obtain the precipitates and supernatant;
(d) Adding 1.4g/L hydrochloric acid into the supernatant obtained after separation in the step (c) to adjust the pH value to 3.8 so as to remove residual carbonate ions, aerating for 1h, adding 0.1g/L sodium hydroxide to adjust the pH value to 8.0, and obtaining recovered brine, wherein the alkalinity of the recovered brine is 186mg/L, the chromaticity is 8 times (calculated by a dilution method), the removal rate is 98.8%, the calcium carbonate hardness is 94mg/L, and the removal rate is 98.9%;
because the salt in the dyed brine used in the embodiment is sodium sulfate, the method further comprises the steps of firstly adopting an NF membrane to separate the recovered brine into salt to obtain produced water and concentrated water, wherein the produced water is a sodium chloride solution with the concentration of 60g/L, the produced water can be directly recycled to a softening resin regeneration process, and the concentrated water contains 100g/L sodium sulfate and 10g/L sodium chloride and can be recycled to the dyeing process after the concentration is regulated.
Comparative example 3
This comparative example separately treats the dyed brine to recycle the salts therein, comprising the steps of:
collecting and putting the dyed brine into a dyed brine collecting tank, wherein the pH value of the dyed brine is 11.4, the chromaticity is 1280 times (calculated by dilution method), the sodium sulfate concentration is 60g/L, the soda concentration is 15g/L, 7g/L of flocculating agent (ferrous sulfate heptahydrate) is added into the dyed brine collecting tank, stirring is carried out for 5min at the speed of 200r/min, then 5mg/L of polyacrylamide is added, stirring is carried out for 30min, reprecipitation separation is carried out, the supernatant is taken to measure the chromaticity of the dyed brine to be 8 times (calculated by dilution method), and the removal rate is 99.4%;
then adding 1.3g/L hydrochloric acid into a dyed salt water collecting tank to adjust the pH value to 3.8, then aerating for 1h, adding 0.1g/L sodium hydroxide to adjust the pH value to 8.0, at the moment, the alkalinity of the obtained recovered salt water is 146mg/L, concentrating through an NF membrane to obtain a sodium sulfate solution with the concentration of 100g/L, and recycling to the dyeing process.
Comparative example 4
This comparative example separately treats the softened backwash brine to recycle salts therein, comprising the steps of:
collecting softened backwash brine, namely softened regenerated brine, into a softened backwash brine collecting tank, wherein the concentration of sodium chloride in the softened backwash brine is 48g/L, and the total hardness (calcium chloride and magnesium chloride) is 17400mg/L; adding 15g/L sodium carbonate and 2.5g/L sodium hydroxide into the softened backwash brine collecting tank, adjusting the pH value to 12.0, stirring at the speed of 200r/min for 30min, and separating by a tubular membrane;
adding 2g/L hydrochloric acid into the separated produced water to adjust the pH value to 4.0, then aerating for 1h, continuously adding 0.1g/L sodium hydroxide to adjust the pH value to 7.5, wherein the alkalinity of the obtained recycled brine is 188mg/L, the hardness is 135mg/L, the removal rate is 99.2%, and the recycled brine can be recycled into the softening and regenerating process.
Wherein the dyed brine and the softened regenerated brine were treated in combination in example 2, the dyed brine was treated alone in comparative example 3 and the softened backwashed brine was treated alone in comparative example 4, and the amounts of the agents used in example 2 and comparative example 3-comparative example 4 are shown in Table 2 below.
TABLE 2
As can be seen from the above Table 2, the integrated treatment of the dyed brine and the softened regenerated brine in the embodiment 2 of the present invention can realize simultaneous recycling of the salt in the dyed brine and the softened regenerated brine, and compared with the treatment of the dyed brine and the softened backwashed brine in the comparative example 3 and the treatment of the softened backwashed brine in the comparative example 4, the integrated treatment of the dyed brine and the softened regenerated brine in the embodiment 2 of the present invention does not require additional addition of flocculant, polyacrylamide and soda ash, and has the advantages of less treatment agent consumption, low running cost, simple operation, etc.
In summary, the method provided by the embodiment of the invention can realize simultaneous recycling of the salt in the dyed brine and the softened regenerated brine, and has the advantages of less dosage of treating agents such as flocculant, polyacrylamide, sodium carbonate and the like, low running cost, simple operation and the like compared with the conventional salt recycling process used in the field.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical invention can be freely combined for use.
Claims (10)
1. A method for simultaneously recycling dyed brine and softened regenerated brine, which is characterized by comprising the following steps:
(1) Mixing the dyed brine and the softened regenerated brine to obtain a mixed solution, adding alkali into the mixed solution, and uniformly mixing to obtain a mixed solution containing precipitate;
(2) Rapidly separating the precipitate from the brine in the mixture containing the precipitate;
(3) Adding acid liquor into the clear liquid obtained after separation in the step (2) to adjust the pH value to 3-4, aerating, and adding alkali to adjust the pH value to 6-9 after aeration is finished to obtain recovered brine.
2. The method of claim 1, wherein the volume ratio of the dyed brine to the softened regenerated brine is from 2:1 to 1:2.
3. The method according to claim 1, wherein in step (1), a base is added to the mixture to adjust the pH to 11.5 to 12.5.
4. A method according to claim 1 or 3, wherein in step (1) the base comprises sodium hydroxide, calcium hydroxide or potassium hydroxide.
5. The method of claim 1, wherein in step (2), the rapid separation comprises precipitation, mechanical filtration, membrane filtration, or centrifugation.
6. The method of claim 1, wherein in step (3), the acid solution comprises sulfuric acid or hydrochloric acid.
7. The method according to claim 1, wherein in the step (3), the aeration time is 0.5 to 2 hours.
8. The method of claim 1, wherein in step (3), the base comprises sodium hydroxide, calcium hydroxide, or potassium hydroxide.
9. The method of claim 1, wherein when the salt in the dyed brine is sodium chloride, the method further comprises directly recycling the recovered brine to the dyeing process and/or the softening resin regeneration process.
10. The method of claim 1, wherein when the salt in the dyed brine is sodium sulfate, the method further comprises separating the recovered brine into produced water and concentrated water by NF membrane, and recycling the produced water to the softening resin regeneration process and recycling the concentrated water to the dyeing process.
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| CN113529442A (en) * | 2021-08-06 | 2021-10-22 | 西安工程大学 | Method for recycling inorganic salt in dyeing of reactive dye |
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