CN114605009B - Sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment - Google Patents
Sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment Download PDFInfo
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- CN114605009B CN114605009B CN202210252634.0A CN202210252634A CN114605009B CN 114605009 B CN114605009 B CN 114605009B CN 202210252634 A CN202210252634 A CN 202210252634A CN 114605009 B CN114605009 B CN 114605009B
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 246
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000004043 dyeing Methods 0.000 title claims abstract description 24
- 238000004064 recycling Methods 0.000 title claims abstract description 21
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 claims abstract description 59
- 239000012141 concentrate Substances 0.000 claims abstract description 51
- 238000001471 micro-filtration Methods 0.000 claims abstract description 39
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000012267 brine Substances 0.000 claims abstract description 28
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 28
- 238000000909 electrodialysis Methods 0.000 claims abstract description 25
- 239000000243 solution Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000002351 wastewater Substances 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 12
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 67
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 15
- 150000003839 salts Chemical class 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 12
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 5
- 239000013505 freshwater Substances 0.000 claims description 5
- 238000001728 nano-filtration Methods 0.000 claims description 5
- 238000011197 physicochemical method Methods 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- 238000005370 electroosmosis Methods 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 48
- 239000000377 silicon dioxide Substances 0.000 description 24
- 235000012239 silicon dioxide Nutrition 0.000 description 24
- 208000028659 discharge Diseases 0.000 description 9
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
-
- 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
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/60—Silicon compounds
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment, which comprises pretreatment, a high-pressure sea light membrane device, an electrodialysis device, a sea light membrane device, a microfiltration system reaction tank, a microfiltration membrane device and acid addition, wherein the invention effectively solves the problem of the discharge of the dilute brine of the electroosmosis, such as the waste of residual sodium chloride caused by the discharge of the dilute brine of the electroosmosis, thus the invention can recycle the dilute brine of the electroosmosis, and after concentration, the high-salt high-silicon sodium chloride concentrate can be obtained by using the microfiltration device and adding magnesium chloride solution (the content of 7.5%) and composite nano-liquid alkali (the content of calcium hydroxide of 25%) into the solution 2 The concentration is reduced to 20mg/L, and the SiO is solved 2 The problem of blocking the high-pressure sea light membrane is solved, and the steps are circulated, so that 100% recycling of sodium chloride and zero discharge of wastewater are realized.
Description
Technical Field
The invention relates to the field of zero discharge of sewage treatment, in particular to a sodium chloride recycling zero discharge treatment method for printing and dyeing wastewater treatment.
Background
Along with the increasing requirements of China on environmental protection, the method is further suitable for various industriesThe discharge water quality index and the discharge capacity of the wastewater produced in the process are higher in requirements. Taking printing and dyeing enterprises as an example, sewage is generally recycled by reclaimed water after conventional and advanced treatment, and the rest is mainly composed of total salt (the concentration is generally about 20000 mg/L), conductivity (the conductivity is generally about 20000 us/cm) and silicon dioxide (SiO) 2 Generally above 60 mg/L) and the like, can not be directly recycled, and can only achieve the standard discharge under the condition of not entering a sewage zero discharge system for treatment.
The existing zero-emission treatment process of the high-salt printing and dyeing wastewater can recycle part of sodium chloride, but a small amount of residual waste liquid still remains in the recycling process, and the part of waste liquid can only be discharged under the condition of no treatment, so that most of the existing processes belong to zero-emission-approaching processes and do not achieve zero emission completely.
Disclosure of Invention
The invention aims to provide a sodium chloride recycling zero-emission treatment method for treating printing and dyeing wastewater, which solves the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment comprises the following steps:
pretreatment: after the dyeing wastewater is treated by conventional sewage treatment, softening, separating salt by nanofiltration membrane and concentrating by low-pressure sea light membrane to obtain SiO with concentration of 2 percent 2 Sodium chloride concentrate of 20 mg/L;
high-pressure sea membrane diluting device: the concentration obtained in the step a) is 2 percent, siO 2 The concentrated sodium chloride water with concentration of 20mg/L enters a high-pressure sea membrane device for concentration to obtain SiO with concentration of 5 percent 2 The concentration water is 50mg/L sodium chloride, and in the process, the produced water is used as reclaimed water for external supply;
electrodialysis device: concentrating the sodium chloride concentrate produced in the step b) by an electrodialysis device to obtain a sodium chloride concentrate with the concentration of 18%, and recovering the sodium chloride concentrate to a concentrated brine side for external supply to obtain a sodium chloride concentrate with the concentration of 2% and SiO 2 60mg/L sodium chloride concentrate;
sea light membrane device: setting the concentration obtained in step c) to 2%,SiO 2 delivering 60mg/L sodium chloride concentrate into sea membrane device for reverse osmosis treatment, and collecting water with concentration of 6% and SiO 2 120mg/L sodium chloride concentrate;
e) Reaction tank of microfiltration system: the concentration obtained in the step d) is 6%, siO 2 120mg/L sodium chloride concentrated water enters a reaction tank of a microfiltration system, and magnesium chloride solution (the content is 7.5%) and composite nano liquid alkali (the content of calcium hydroxide is 25%) are added, mixed and stirred;
f) Microfiltration membrane device: carrying out microfiltration on the sodium chloride concentrated water obtained in the step e) by a microfiltration membrane device, and obtaining the water produced by microfiltration with the concentration of 6 percent and SiO 2 20mg/L of 6% sodium chloride concentrate;
g) Acid adding: the concentration after step f) is 6%, siO 2 Adding 31% hydrochloric acid into 20mg/L sodium chloride concentrated water to adjust the pH value to 8.5, and circularly reaching zero row through the steps b) to f).
Preferably, the conventional sewage treatment in the step a) is one or a combination of a plurality of physical treatment methods, chemical treatment methods, physicochemical methods and biological treatment methods.
Preferably, in the step b), the mixture enters a high-pressure sea membrane device for concentration to obtain SiO with the concentration of 5 percent 2 And discharging 50mg/L sodium chloride concentrated water to a high-pressure sea fresh water pool for storage.
Preferably, in the step c), a concentrated brine pond and a dilute brine pond are respectively arranged on two sides of the outside of the electrodialysis device, sodium chloride concentrated solution with 18% concentration obtained by secondary concentration in the electrodialysis device is discharged to the concentrated brine pond for external supply, and the concentration is 2% and SiO is obtained 2 And discharging 60mg/L sodium chloride concentrated water to a dilute brine pond for storage.
Preferably, in the step d), the dilute brine tank is discharged into the concentration of 2% by a booster pump, and SiO 2 60mg/L sodium chloride concentrate to sea-thin film device.
Preferably, in the step e), the adding amount of the magnesium chloride solution (the content of 7.5%) is 12000 mg/L-15000 mg/L, the adding amount of the composite nano liquid alkali (the content of calcium hydroxide of 25%) is 20000 mg/L-25000 mg/L, and in the mixing process, the stirring is carried out by adopting a stirrer, the reaction time is 30min, and the PH value is 11.5.
Preferably, in the step f), after the chemical adding and mixing reaction, sodium chloride concentrated water with the concentration of 6% is conveyed to the microfiltration membrane device through a booster pump.
Preferably, in the step g), the sodium chloride concentrated water after the acid addition sequentially enters a high-pressure sea water membrane device and an electrodialysis device.
Compared with the prior art, the invention has the beneficial effects that the invention provides the sodium chloride recycling zero-emission treatment method for the printing and dyeing wastewater treatment, solves the problem of the discharge of the electroosmosis dilute brine, such as the residual sodium chloride waste caused by the discharge of the electroosmosis dilute brine, can recycle the electroosmosis dilute brine, and can recycle the SiO of the high-salt high-silicon sodium chloride concentrated water after concentrating by using a microfiltration device and adding the magnesium chloride solution (the content is 7.5%) and the composite nano-liquid alkali (the calcium hydroxide content is 25%) after concentrating 2 The concentration is reduced to 20mg/L, and the SiO is solved 2 The problem of blocking the high-pressure sea light membrane is solved by recycling the sodium chloride according to the steps b) to f) so as to realize 100% recycling of the sodium chloride and zero discharge of wastewater.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of the process flow of the present invention.
Detailed Description
The invention is described below with reference to the accompanying drawings in a preferred manner:
example 1
A sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment comprises the following steps:
a) Pretreatment: after the dyeing wastewater is treated by conventional sewage treatment, softening, separating salt by nanofiltration membrane and concentrating by low-pressure sea light membrane to obtain SiO with concentration of 2 percent 2 Chlorine of 20mg/LSodium dissolving concentrate;
b) High-pressure sea membrane diluting device: the concentration obtained in the step a) is 2 percent, siO 2 The concentrated sodium chloride water with concentration of 20mg/L enters a high-pressure sea membrane device for concentration to obtain SiO with concentration of 5 percent 2 The concentration water is 50mg/L sodium chloride, and in the process, the produced water is used as reclaimed water for external supply;
c) Electrodialysis device: concentrating the sodium chloride concentrate produced in the step b) by an electrodialysis device to obtain a sodium chloride concentrate with the concentration of 18%, and recovering the sodium chloride concentrate to a concentrated brine side for external supply to obtain a sodium chloride concentrate with the concentration of 2% and SiO 2 60mg/L sodium chloride concentrate;
d) Sea light membrane device: the concentration obtained in the step c) is 2%, siO 2 Delivering 60mg/L sodium chloride concentrate into sea membrane device for reverse osmosis treatment, and collecting water with concentration of 6% and SiO 2 120mg/L sodium chloride concentrate;
e) Reaction tank of microfiltration system: the concentration obtained in the step d) is 6%, siO 2 120mg/L sodium chloride concentrated water enters a reaction tank of a microfiltration system, 12000mg/L magnesium chloride solution (the content of which is 7.5%) and 25000mg/L composite nano-liquid alkali (the content of calcium hydroxide) are added, and then the mixture is mixed and stirred;
f) Microfiltration membrane device: carrying out microfiltration on the sodium chloride concentrated water obtained in the step e) by a microfiltration membrane device, and obtaining the water produced by microfiltration with the concentration of 6 percent and SiO 2 20mg/L of 6% sodium chloride concentrate;
g) Acid adding: the concentration after step f) is 6%, siO 2 Adding 31% hydrochloric acid into 20mg/L sodium chloride concentrated water to adjust the pH value to 8.5, and circularly reaching zero row through the steps b) to f).
As a further scheme of the invention, the conventional sewage treatment in the step a) is one or a combination of a plurality of physical treatment methods, chemical treatment methods, physicochemical methods and biological treatment methods.
As a further scheme of the invention, in the step b), the mixture enters a high-pressure sea membrane device for concentration to obtain SiO with the concentration of 5 percent 2 And discharging 50mg/L sodium chloride concentrated water to a high-pressure sea fresh water pool for storage.
As a further aspect of the inventionIn the step c), a concentrated salt pond and a dilute salt pond are respectively arranged on two sides of the outside of the electrodialysis device, sodium chloride concentrated solution with 18% concentration obtained by secondary concentration in the electrodialysis device is discharged to the concentrated salt pond for external supply, and the concentration is 2% and SiO is obtained 2 And discharging 60mg/L sodium chloride concentrated water to a dilute brine pond for storage.
As a further scheme of the invention, in the step d), the dilute brine pond is discharged into the concentration of 2 percent by a booster pump, and SiO is discharged into the concentration tank by a booster pump 2 60mg/L sodium chloride concentrate to sea-thin film device.
As a further scheme of the invention, in the step e), the adding amount of the magnesium chloride solution (7.5% content) is 12000mg/L, the adding amount of the composite nano liquid alkali (calcium hydroxide content 25%) is 20000mg/L, and in the mixing process, the stirring is carried out by adopting a stirrer, the reaction time is 30min, and the PH value is 11.5.
In the step f), after the chemical adding and mixing reaction, sodium chloride concentrated water with the concentration of 6% is conveyed to the microfiltration membrane device through a booster pump.
As a further scheme of the invention, in the step g), the sodium chloride concentrated water after acid addition sequentially enters a high-pressure sea water membrane device and an electrodialysis device.
Example 2
A sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment comprises the following steps:
a) Pretreatment: after the dyeing wastewater is treated by conventional sewage treatment, softening, separating salt by nanofiltration membrane and concentrating by low-pressure sea light membrane to obtain SiO with concentration of 2 percent 2 Sodium chloride concentrate of 20 mg/L;
b) High-pressure sea membrane diluting device: the concentration obtained in the step a) is 2 percent, siO 2 The concentrated sodium chloride water with concentration of 20mg/L enters a high-pressure sea membrane device for concentration to obtain SiO with concentration of 5 percent 2 The concentration water is 50mg/L sodium chloride, and in the process, the produced water is used as reclaimed water for external supply;
c) Electrodialysis device: concentrating the sodium chloride concentrate produced in the step b) by an electrodialysis device to obtain a sodium chloride concentrate with the concentration of 18%, recycling the sodium chloride concentrate to a concentrated brine side for external supply, andthe concentration is 2%, siO 2 60mg/L sodium chloride concentrate;
d) Sea light membrane device: the concentration obtained in the step c) is 2%, siO 2 Delivering 60mg/L sodium chloride concentrate into sea membrane device for reverse osmosis treatment, and collecting water with concentration of 6% and SiO 2 120mg/L sodium chloride concentrate;
e) Reaction tank of microfiltration system: the concentration obtained in the step d) is 6%, siO 2 120mg/L sodium chloride concentrated water enters a reaction tank of a microfiltration system, 12000mg/L magnesium chloride solution (7.5% content) and 25000mg/L composite nano-liquid alkali (calcium hydroxide content 25%) are added, and then mixed and stirred;
f) Microfiltration membrane device: carrying out microfiltration on the sodium chloride concentrated water obtained in the step e) by a microfiltration membrane device, and obtaining the water produced by microfiltration with the concentration of 6 percent and SiO 2 20mg/L of 6% sodium chloride concentrate;
g) Acid adding: the concentration after step f) is 6%, siO 2 Adding 31% hydrochloric acid into 20mg/L sodium chloride concentrated water to adjust the pH value to 8.5, and circularly reaching zero row through the steps b) to f).
As a further scheme of the invention, the conventional sewage treatment in the step a) is one or a combination of a plurality of physical treatment methods, chemical treatment methods, physicochemical methods and biological treatment methods.
As a further scheme of the invention, in the step b), the mixture enters a high-pressure sea membrane device for concentration to obtain SiO with the concentration of 5 percent 2 And discharging 50mg/L sodium chloride concentrated water to a high-pressure sea fresh water pool for storage.
In the step c), the two sides of the outside of the electrodialysis device are respectively provided with a concentrated salt pond and a dilute salt pond, the concentrated solution of sodium chloride with the concentration of 18 percent is obtained by secondary concentration in the electrodialysis device and is discharged to the concentrated salt pond for external supply, and the concentration is 2 percent, and SiO is obtained 2 And discharging 60mg/L sodium chloride concentrated water to a dilute brine pond for storage.
As a further scheme of the invention, in the step d), the dilute brine pond is discharged into the concentration of 2 percent by a booster pump, and SiO is discharged into the concentration tank by a booster pump 2 60mg/L sodium chloride concentrate to sea waterA membrane device.
As a further scheme of the invention, in the step e), the adding amount of the magnesium chloride solution (7.5% content) is 13500mg/L, and the adding amount of the composite nano liquid alkali (calcium hydroxide content 25%) is 22500mg/L, and in the mixing process, the magnesium chloride solution is stirred by a stirrer, the reaction time is 30min, and the PH value is 11.5.
In the step f), after the chemical adding and mixing reaction, sodium chloride concentrated water with the concentration of 6% is conveyed to the microfiltration membrane device through a booster pump.
As a further scheme of the invention, in the step g), the sodium chloride concentrated water after acid addition sequentially enters a high-pressure sea water membrane device and an electrodialysis device.
Example 3
A sodium chloride recycling zero-emission treatment method for printing and dyeing wastewater treatment comprises the following steps:
a) Pretreatment: after the dyeing wastewater is treated by conventional sewage treatment, softening, separating salt by nanofiltration membrane and concentrating by low-pressure sea light membrane to obtain SiO with concentration of 2 percent 2 Sodium chloride concentrate of 20 mg/L;
b) High-pressure sea membrane diluting device: the concentration obtained in the step a) is 2 percent, siO 2 The concentrated sodium chloride water with concentration of 20mg/L enters a high-pressure sea membrane device for concentration to obtain SiO with concentration of 5 percent 2 The concentration water is 50mg/L sodium chloride, and in the process, the produced water is used as reclaimed water for external supply;
c) Electrodialysis device: concentrating the sodium chloride concentrate produced in the step b) by an electrodialysis device to obtain a sodium chloride concentrate with the concentration of 18%, and recovering the sodium chloride concentrate to a concentrated brine side for external supply to obtain a sodium chloride concentrate with the concentration of 2% and SiO 2 60mg/L sodium chloride concentrate;
d) Sea light membrane device: the concentration obtained in the step c) is 2%, siO 2 Delivering 60mg/L sodium chloride concentrate into sea membrane device for reverse osmosis treatment, and collecting water with concentration of 6% and SiO 2 120mg/L sodium chloride concentrate;
e) Reaction tank of microfiltration system: the concentration obtained in the step d) is 6%, siO 2 120mg/L sodium chloride concentrate enters a microfiltration system for reverse reactionAdding a magnesium chloride solution (7.5% content) and a composite nano liquid alkali (calcium hydroxide content 25%) into a reaction tank, and then mixing and stirring;
f) Microfiltration membrane device: carrying out microfiltration on the sodium chloride concentrated water obtained in the step e) by a microfiltration membrane device, and obtaining 6% sodium chloride concentrated water with the concentration of 6% and the SiO2 concentration of 20mg/L after the water is produced by microfiltration;
g) Acid adding: the concentration after step f) is 6%, siO 2 Adding 31% hydrochloric acid into 20mg/L sodium chloride concentrated water to adjust the pH value to 8.5, and circularly reaching zero row through the steps b) to f).
As a further scheme of the invention, the conventional sewage treatment in the step a) is one or a combination of a plurality of physical treatment methods, chemical treatment methods, physicochemical methods and biological treatment methods.
As a further scheme of the invention, in the step b), the mixture enters a high-pressure sea membrane device for concentration to obtain SiO with the concentration of 5 percent 2 And discharging 50mg/L sodium chloride concentrated water to a high-pressure sea fresh water pool for storage.
In the step c), the two sides of the outside of the electrodialysis device are respectively provided with a concentrated salt pond and a dilute salt pond, the concentrated solution of sodium chloride with the concentration of 18 percent is obtained by secondary concentration in the electrodialysis device and is discharged to the concentrated salt pond for external supply, and the concentration is 2 percent, and SiO is obtained 2 And discharging 60mg/L sodium chloride concentrated water to a dilute brine pond for storage.
As a further scheme of the invention, in the step d), the dilute brine pond is discharged into the concentration of 2 percent by a booster pump, and SiO is discharged into the concentration tank by a booster pump 2 60mg/L sodium chloride concentrate to sea-thin film device.
As a further scheme of the invention, in the step e), the adding amount of the magnesium chloride solution (7.5% content) is 15000mg/L, the adding amount of the composite nano liquid alkali (calcium hydroxide content 25%) is 25000mg/L, and in the mixing process, the magnesium chloride solution is stirred by a stirrer, the reaction time is 30min, and the PH value is 11.5.
In the step f), after the chemical adding and mixing reaction, sodium chloride concentrated water with the concentration of 6% is conveyed to the microfiltration membrane device through a booster pump.
As a further scheme of the invention, in the step g), the sodium chloride concentrated water after acid addition sequentially enters a high-pressure sea water membrane device and an electrodialysis device.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The sodium chloride recovery zero-emission treatment method for the treatment of the printing and dyeing wastewater is characterized by comprising the following steps of:
a) Pretreatment: after the dyeing wastewater is treated by conventional sewage treatment, softening, separating salt by nanofiltration membrane and concentrating by low-pressure sea light membrane to obtain SiO with concentration of 2 percent 2 Sodium chloride concentrate of 20 mg/L;
b) High-pressure sea membrane diluting device: the concentration obtained in the step a) is 2 percent, siO 2 The concentrated sodium chloride water with concentration of 20mg/L enters a high-pressure sea membrane device for concentration to obtain SiO with concentration of 5 percent 2 The concentration water is 50mg/L sodium chloride, and in the process, the produced water is used as reclaimed water for external supply;
c) Electrodialysis device: concentrating the sodium chloride concentrate produced in the step b) by an electrodialysis device to obtain a sodium chloride concentrate with the concentration of 18%, and recovering the sodium chloride concentrate to a concentrated brine side for external supply to obtain a sodium chloride concentrate with the concentration of 2% and SiO 2 60mg/L sodium chloride concentrate;
d) Sea light membrane device: the concentration obtained in the step c) is 2%, siO 2 Delivering 60mg/L sodium chloride concentrate into sea membrane device for reverse osmosis treatment, and collecting water with concentration of 6% and SiO 2 120mg/L sodium chloride concentrate;
e) Reaction tank of microfiltration system: the concentration obtained in the step d) is 6%, siO 2 120mg/L sodium chloride concentrated water enters a reaction tank of a microfiltration system, and is mixed and stirred after adding a magnesium chloride solution with the content of 7.5% and a compound nano-liquid alkali with the content of 25% of calcium hydroxide;
f) Microfiltration ofMembrane device: carrying out microfiltration on the sodium chloride concentrated water obtained in the step e) by a microfiltration membrane device, and obtaining the water produced by microfiltration with the concentration of 6 percent and SiO 2 20mg/L of 6% sodium chloride concentrate;
g) Acid adding: the concentration after step f) is 6%, siO 2 Adding 31% hydrochloric acid into 20mg/L sodium chloride concentrated water to adjust the pH value to 8.5, and circularly reaching zero row through the steps b) to f).
2. The method for recycling sodium chloride zero release treatment in printing and dyeing wastewater according to claim 1, wherein the conventional wastewater treatment in the step a) is one or a combination of a plurality of physical treatment methods, chemical treatment methods, physicochemical methods and biological treatment methods.
3. The method for recycling sodium chloride and zero release treatment in printing and dyeing wastewater according to claim 1, wherein in the step b), the sodium chloride is concentrated in a high-pressure sea-pale membrane device to obtain SiO with concentration of 5 percent 2 And discharging 50mg/L sodium chloride concentrated water to a high-pressure sea fresh water pool for storage.
4. The method for recycling and zero-emission treatment of sodium chloride in printing and dyeing wastewater according to claim 1, wherein in the step c), a concentrated brine pond and a dilute brine pond are respectively arranged on two sides of the outside of the electrodialysis device, sodium chloride concentrate with 18% concentration obtained by secondary concentration in the electrodialysis device is discharged to the concentrated brine pond for external supply, and the concentration is 2%, and SiO is obtained 2 And discharging 60mg/L sodium chloride concentrated water to a dilute brine pond for storage.
5. The method for recycling sodium chloride from printing and dyeing wastewater according to claim 1, wherein in step d), the dilute brine tank is discharged into the concentration of 2% by a booster pump, and the concentration of SiO is lower than the concentration of the dilute brine tank 2 60mg/L sodium chloride concentrate to sea-thin film device.
6. The method for recycling sodium chloride and zero-emission treatment in printing and dyeing wastewater according to claim 1, wherein in the step e), the magnesium chloride solution with the content of 7.5% is added in an amount of 12000 mg/L-15000 mg/L, and the calcium hydroxide composite nano liquid alkali with the content of 25% is added in an amount of 20000 mg/L-25000 mg/L in the mixing process, and the mixture is stirred by a stirrer, the reaction time is 30min, and the pH value is 11.5.
7. The method for recycling sodium chloride with zero discharge in printing and dyeing wastewater treatment according to claim 1, wherein in the step f), after the chemical adding and mixing reaction, sodium chloride concentrated water with the concentration of 6% is conveyed to the microfiltration membrane device through a booster pump.
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