CN111439869A - High-salinity wastewater zero-discharge treatment method and system - Google Patents
High-salinity wastewater zero-discharge treatment method and system Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 49
- 208000028659 discharge Diseases 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 150000003839 salts Chemical class 0.000 claims abstract description 46
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000004062 sedimentation Methods 0.000 claims abstract description 17
- 239000002244 precipitate Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 239000010865 sewage Substances 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- 238000001914 filtration Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 229910001385 heavy metal Inorganic materials 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 150000005837 radical ions Chemical class 0.000 claims description 7
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 5
- 229910021645 metal ion Inorganic materials 0.000 claims description 5
- 239000008213 purified water Substances 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000003311 flocculating effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000000108 ultra-filtration Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 12
- 230000008020 evaporation Effects 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000012267 brine Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- -1 sulfate radical Chemical class 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-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
- ZHQNSTNWSYTIKD-UHFFFAOYSA-K [Al](Cl)(Cl)Cl.[Ca] Chemical compound [Al](Cl)(Cl)Cl.[Ca] ZHQNSTNWSYTIKD-UHFFFAOYSA-K 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Classifications
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- 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
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
- C01D1/30—Purification; Separation by crystallisation
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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)
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Abstract
The invention relates to a high-salinity wastewater zero-discharge treatment system, which comprises a regulating tank, a reaction tank, a sedimentation tank, a multi-media filter, a security filter and reverse osmosis equipment which are connected in sequence; still include cryrogenic and divide salt device, reverse osmosis equipment's concentrated solution export with the entry linkage that divides salt device cryrogenically, the export that divides salt device cryrogenically with reverse osmosis unit's sewage entry linkage. The high-salinity wastewater zero-discharge treatment device provided by the invention does not need low-temperature evaporation equipment for salt water separation, has low equipment cost, does not need a heat source, and has low treatment cost per ton of water in actual operation; the device does not need an evaporation mode to remove salts in the high-salt wastewater, so that the condition that a large amount of precipitates are attached to the inner wall of the heat exchange tube does not exist, and the equipment cannot be stopped due to failure; the device does not need pretreatment, and has small investment and low maintenance cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high-salinity wastewater zero-discharge treatment method and system.
Background
With the rapid development of industry, the requirement of wastewater discharge is gradually increased, and at present, almost all high-salinity wastewater final treatment needs salt water separation by using a low-temperature evaporator, and the method has the following technical problems:
1. the low-temperature evaporation equipment is expensive, the investment is large, a heat source is needed, and the cost of water treatment per ton in actual operation is high;
2. the operation difficulty is large, the failure is difficult to overcome frequently, and because the high-salinity wastewater has complex components, a large amount of precipitates are easily generated in the evaporation process and are easily attached to the inner wall of the heat exchange tube to form complex and difficult-to-clean compound water scales such as calcium sulfate, silicate and the like, so that the heat exchange efficiency is reduced, the cost per ton of water is multiplied, and even the water inlet or the water outlet is blocked, so that the equipment is stopped due to failure.
3. High pretreatment requirement, large investment and high maintenance cost.
Disclosure of Invention
The invention aims to provide a high-salinity wastewater zero-emission treatment method and system to solve at least one technical problem.
One technical scheme of the application is as follows: a high-salinity wastewater zero-discharge treatment system comprises a regulating tank, a reaction tank, a sedimentation tank, a multi-media filter, a cartridge filter and reverse osmosis equipment which are connected in sequence; still include cryrogenic and divide salt device, reverse osmosis equipment's concentrated solution export with the entry linkage that divides salt device cryrogenically, the export that divides salt device cryrogenically with reverse osmosis unit's sewage entry linkage.
Preferably, an ultrafilter is arranged between the cartridge filter and the reverse osmosis equipment, a water inlet of the ultrafilter is connected with an outlet of the cartridge filter, and a water outlet of the cartridge filter is connected with a water inlet of the reverse osmosis equipment.
Preferably, a filter is arranged between the ultrafilter and the reverse osmosis equipment, an inlet of the filter is connected with a water outlet of the cartridge filter, and a water outlet of the filter is connected with a water inlet of the reverse osmosis equipment; and a concentrated solution outlet of the nano filter is connected with the reaction tank.
The high-salinity wastewater zero-discharge treatment device provided by the invention is used for treating NaCl and Na in high-salinity wastewater2SO4And the salt which is difficult to remove is converted into NaOH, and the characteristic that the solubility of the NaOH is greatly fluctuated by temperature is utilized, and a refrigerating machine is configured according to actual conditions to provide a refrigerant with the temperature of-35-10 ℃ to carry out deep cooling salt separation on the solution, so that the process is simple and the operation is convenient.
The high-salinity wastewater zero-discharge treatment device provided by the invention has the following advantages:
1. the low-temperature evaporation equipment is not needed for salt water separation, the equipment cost is low, a heat source is not needed, and the cost of water treatment per ton in actual operation is low;
2. the device does not need an evaporation mode to remove salts in the high-salt wastewater, so that the condition that a large amount of precipitates are attached to the inner wall of the heat exchange tube does not exist, and the equipment cannot be stopped due to failure;
3. the device does not need pretreatment, and has small investment and low maintenance cost.
Another technical scheme of the application is as follows: the high-salinity wastewater zero-discharge treatment method comprises the following steps of:
and 5, treating the filtered solution by reverse osmosis equipment to form purified water, putting the concentrated solution generated in the treatment process into a deep cooling salt separation device for salt separation treatment to obtain a light solution and NaOH crystals, treating the light solution by the reverse osmosis equipment again, and repeatedly and circularly finally and thoroughly separating water from salt to realize the final separation of the salt and the water in the high-salinity wastewater.
Preferably, after step 4 and before step 5, the method further comprises: and 41, filtering the filtering solution through an ultrafiltration filter.
Preferably, after step 41 and before step 5, the method further comprises: and 42, filtering the filtered solution by a nano filter, wherein the concentrated solution generated by filtering is introduced into the reaction tank for continuous treatment.
Preferably, the separation method in step 3 is as follows: adding inorganic flocculant such as PAC and PAM into the sedimentation tank, and flocculating and settling the sediment in the reaction tank;
if the lime and the aluminum salt in the reaction tank are excessive, Na can be added2CO3Removing the precipitate;
and if the waste liquid contains heavy metals, adding a heavy metal remover to remove the residual heavy metals.
According to the high-salinity wastewater zero-discharge treatment method, metal ions with more than two valences and weak acid radical ions are precipitated and removed through lime added in a precipitation method, chloride ions and sulfate radical strong acid radicals are precipitated and removed through calcium-aluminum composite salt, solid-liquid separation is carried out in a precipitation tank, water is separated from the solution through a reverse osmosis system, a light solution is obtained through deep cooling crystallization of a concentrated solution, the light solution returns to reverse osmosis circulation for water removal and deep cooling crystallization, and finally brine separation is achieved. NaOH crystals obtained by separating brine belong to high-value byproducts and can be recycled.
The high-salinity wastewater zero-discharge treatment method provided by the invention has the following advantages:
1. the low-temperature evaporation equipment is not needed for salt water separation, the equipment cost is low, a heat source is not needed, and the cost of water treatment per ton in actual operation is low;
2. the device does not need an evaporation mode to remove salts in the high-salt wastewater, so that the condition that a large amount of precipitates are attached to the inner wall of the heat exchange tube does not exist, and the equipment cannot be stopped due to failure;
3. the device does not need pretreatment, and has small investment and low maintenance cost.
Drawings
FIG. 1 is a schematic view showing the construction of a high-salinity wastewater zero-discharge treatment apparatus according to example 1, wherein the flow direction of the liquid is schematically indicated by arrows;
wherein the reference numbers: the device comprises a regulating tank 1, a reaction tank 2, a stirring device 2-1, a sedimentation tank 3, a multi-medium filter 4, a cartridge filter 5, a reverse osmosis device 6, a cryogenic salt separation device 7, an ultrafilter 8 and a nanofilter 9.
Detailed Description
The invention is further illustrated by the following figures and examples.
The high-salinity wastewater refers to wastewater with the content of sodium chloride or sodium sulfate between 10% and 20%, and contains other high-concentration salts.
The high-salinity wastewater zero-discharge treatment device is used for treating NaCl and Na in high-salinity wastewater2SO4And the salt which is difficult to remove is converted into NaOH, and the characteristic that the solubility of the NaOH is greatly fluctuated by temperature is utilized, and the refrigerant is configured according to actual conditions to provide chilled water with the temperature of-35-10 ℃ to carry out deep cooling salt separation on the solution, so that the process is simple and the operation is convenient.
This high salt waste water zero release processing apparatus has following advantage:
1. the low-temperature evaporation equipment is not needed for salt water separation, the equipment cost is low, a heat source is not needed, and the cost of water treatment per ton in actual operation is low;
2. the device does not need an evaporation mode to remove salts in the high-salt wastewater, so that the condition that a large amount of precipitates are attached to the inner wall of the heat exchange tube does not exist, and the equipment cannot be stopped due to failure;
3. the device does not need pretreatment, and has small investment and low maintenance cost.
In a preferred embodiment, an ultrafilter 8 is arranged between the cartridge filter and the reverse osmosis equipment, a water inlet of the ultrafilter is connected with an outlet of the cartridge filter, and a water outlet of the cartridge filter is connected with a water inlet of the reverse osmosis equipment. Therefore, impurities in the filtered solution are further removed after the filtered solution is further filtered, and the treatment of reverse osmosis equipment is facilitated.
As a preferable embodiment, a filter 9 is arranged between the ultrafilter and the reverse osmosis equipment, the inlet of the filter is connected with the water outlet of the cartridge filter, and the water outlet of the filter is connected with the water inlet of the reverse osmosis equipment; the concentrated solution outlet of the nano filter is connected with the reaction tank, so that the concentrated solution generated by filtering of the nano filter can be recycled, and the generation of purified water is improved.
and 5, treating the filtered solution by using reverse osmosis equipment to form purified water, putting the concentrated solution generated in the treatment process into a deep cooling salt separation device to perform salt separation treatment by using the principle that the solubility of NaOH changes along with the temperature change to obtain a light solution and NaOH crystals, treating the light solution by using the reverse osmosis equipment again, and repeatedly and circularly separating water from salt finally and completely to realize the final separation of the salt and the water in the high-salinity wastewater.
The treatment method comprises the steps of removing metal ions with more than two valences and weak acid radical ions through lime added in a precipitation method, removing chloride ions and sulfate radical strong acid radical precipitates through calcium-aluminum composite salt, then carrying out solid-liquid separation in a precipitation tank, separating water from the solution through a reverse osmosis system, obtaining a light solution through deep cooling crystallization of the concentrated solution, returning the light solution to reverse osmosis circulation for water removal and deep cooling crystallization, and finally realizing brine separation. NaOH crystals obtained by separating brine belong to high-value byproducts and can be recycled.
The high-salinity wastewater zero-discharge treatment method has the following advantages:
1. the low-temperature evaporation equipment is not needed for salt water separation, the equipment cost is low, a heat source is not needed, and the cost of water treatment per ton in actual operation is low;
2. the device does not need an evaporation mode to remove salts in the high-salt wastewater, so that the condition that a large amount of precipitates are attached to the inner wall of the heat exchange tube does not exist, and the equipment cannot be stopped due to failure;
3. the device does not need pretreatment, and has small investment and low maintenance cost.
As a preferred embodiment, after step 4 and before step 5, the method further comprises:
and step 41, filtering the filtered solution by an ultrafiltration filter, so as to further remove impurities in the filtered solution after filtering the filtered solution, and further facilitate the treatment of reverse osmosis equipment.
As a preferred embodiment, after step 41 and before step 5, the method further includes:
and 42, filtering the filtered solution by a nano-filter, wherein the concentrated solution generated by filtering is introduced into the reaction tank for continuous treatment, so that the concentrated solution generated by filtering by the nano-filter can be recycled, and the generation of purified water is improved.
As a specific embodiment, the separation method in step 3 is: adding inorganic flocculant such as PAC and PAM into the sedimentation tank, and flocculating and settling the sediment in the reaction tank;
if the lime and the aluminum salt in the reaction tank are excessive, Na can be added2CO3Removing the precipitate;
if the waste liquid contains heavy metals, adding a heavy metal remover to remove the residual heavy metals, wherein the heavy metal remover can use an organic sulfur heavy metal remover, which is well known by the technical personnel in the field and is not described again;
the residual cold of the dilute solution after the cryogenic treatment can exchange heat with the water of the deep cooling device through the heat exchanger, so that the cold recovery is ensured.
The following is a comparison table of the high-salinity wastewater zero-discharge treatment device and method of the invention and the prior high-salinity wastewater zero-discharge treatment device and method:
the above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the present invention, and the terms first, second, etc. are used for distinguishing between similar terms and not for limiting the technical terms, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A high-salinity wastewater zero-discharge treatment system comprises a regulating tank (1), a reaction tank (2), a sedimentation tank (3), a multi-media filter (4), a security filter (5) and reverse osmosis equipment (6) which are connected in sequence;
the system is characterized by further comprising a deep cooling salt separation device (7), wherein a concentrated solution outlet of the reverse osmosis equipment is connected with an inlet of the deep cooling salt separation device, and an outlet of the deep cooling salt separation device is connected with a sewage inlet of the reverse osmosis device.
2. The high-salinity wastewater zero-emission treatment device according to claim 1, characterized in that an ultrafilter (8) is arranged between the cartridge filter and the reverse osmosis equipment, the water inlet of the ultrafilter is connected with the outlet of the cartridge filter, and the water outlet of the cartridge filter is connected with the water inlet of the reverse osmosis equipment.
3. The high-salinity wastewater zero-emission treatment device according to claim 2, characterized in that a nano filter (9) is arranged between the ultrafilter and the reverse osmosis equipment, the inlet of the nano filter is connected with the water outlet of the cartridge filter, and the water outlet of the nano filter is connected with the water inlet of the reverse osmosis equipment;
and a concentrated solution outlet of the nano filter is connected with the reaction tank.
4. A high-salinity wastewater zero-discharge treatment method, which is characterized in that the high-salinity wastewater zero-discharge treatment device of any one of claims 1 to 3 is used, and comprises the following steps:
step 1, pumping high-salinity wastewater into a regulating tank for storage;
step 2, introducing the high-salinity wastewater in the regulating tank into a reaction tank, adding a mixture of lime and aluminum salt into the reaction tank, controlling the pH to be 11-12, and removing divalent and more than divalent metal ions and acid radical ions to form an alkaline solution mainly containing NaOH and a precipitate mixture;
step 3, introducing the mixture into a sedimentation tank, separating sediment from the solution, and forming a supernatant taking NaOH as a main component on the upper part of the sedimentation tank after the mixture is subjected to sedimentation separation;
step 4, filtering the supernatant through a multi-media filter and a cartridge filter in sequence to form a filtered solution;
and 5, treating the filtered solution by reverse osmosis equipment to form purified water, putting the concentrated solution generated in the treatment process into a deep cooling salt separation device for salt separation treatment to obtain a light solution and NaOH crystals, treating the light solution by the reverse osmosis equipment again, and repeatedly and circularly finally and thoroughly separating water from salt to realize the final separation of the salt and the water in the high-salinity wastewater.
5. The method for zero discharge of high salinity wastewater according to claim 4, characterized in that, after step 4 and before step 5, the method further comprises:
and 41, filtering the filtering solution through an ultrafiltration filter.
6. The method as claimed in claim 5, further comprising, after step 41 and before step 5:
and 42, filtering the filtered solution by a nano filter, wherein the concentrated solution generated by filtering is introduced into the reaction tank for continuous treatment.
7. The high-salinity wastewater zero-discharge treatment method according to claim 5, characterized in that the separation method in the step 3 is as follows: adding inorganic flocculant such as PAC and PAM into the sedimentation tank, and flocculating and settling the sediment in the reaction tank;
if the lime and the aluminum salt in the reaction tank are excessive, Na can be added2CO3Removing the precipitate;
and if the waste liquid contains heavy metals, adding a heavy metal remover to remove the residual heavy metals.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113754148A (en) * | 2021-09-26 | 2021-12-07 | 导洁(北京)环境科技有限公司 | Desulfurization wastewater zero-discharge treatment method and system |
| CN113943087A (en) * | 2021-11-22 | 2022-01-18 | 导洁(北京)环境科技有限公司 | Treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater |
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| CN113943087A (en) * | 2021-11-22 | 2022-01-18 | 导洁(北京)环境科技有限公司 | Treatment method of high-salinity high-phosphorus high-ammonia nitrogen organic wastewater |
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