CN107473291B - Treatment method of high-salinity wastewater - Google Patents
Treatment method of high-salinity wastewater Download PDFInfo
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- CN107473291B CN107473291B CN201710953850.7A CN201710953850A CN107473291B CN 107473291 B CN107473291 B CN 107473291B CN 201710953850 A CN201710953850 A CN 201710953850A CN 107473291 B CN107473291 B CN 107473291B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000000926 separation method Methods 0.000 claims abstract description 61
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000011780 sodium chloride Substances 0.000 claims abstract description 29
- 239000013505 freshwater Substances 0.000 claims abstract description 26
- 230000005484 gravity Effects 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 9
- 239000003960 organic solvent Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- LCPDWSOZIOUXRV-UHFFFAOYSA-N phenoxyacetic acid Chemical group OC(=O)COC1=CC=CC=C1 LCPDWSOZIOUXRV-UHFFFAOYSA-N 0.000 claims description 46
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims description 36
- 150000003839 salts Chemical class 0.000 claims description 22
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 16
- 239000012267 brine Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002250 absorbent Substances 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 6
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 6
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 claims description 4
- QDTDKYHPHANITQ-UHFFFAOYSA-N 7-methyloctan-1-ol Chemical compound CC(C)CCCCCCO QDTDKYHPHANITQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004439 Isononyl alcohol Substances 0.000 claims description 4
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims description 4
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims 1
- 238000000502 dialysis Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002904 solvent Substances 0.000 abstract description 3
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 70
- 238000004519 manufacturing process Methods 0.000 description 11
- 210000003298 dental enamel Anatomy 0.000 description 7
- 238000004064 recycling Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000012044 organic layer Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- VUWRUTAFMHYDRD-UHFFFAOYSA-N chlorobenzene;2-phenoxyacetic acid Chemical compound ClC1=CC=CC=C1.OC(=O)COC1=CC=CC=C1 VUWRUTAFMHYDRD-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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)
- Removal Of Specific Substances (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of chemical industry, and particularly relates to a method for treating high-salinity wastewater. The density difference of the saline water, the organic solvent and the fresh water is utilized, the water-absorbing substance is added into the solvent to form a separation layer, the separation layer is gradually layered under the action of gravity, namely the lower layer is the high-salinity wastewater, the middle layer is the organic solvent separation layer, the upper layer is the fresh water, the reclaimed water can be recycled, the saline water and the separation layer are heated by waste heat, heating and cooling circulation is carried out after the fresh water is led out, the gravity dialysis process strengthened by the waste heat can be realized, and the acceleration of the saline water separation operation is realized. The invention has low energy consumption and low equipment requirement, can be used for pretreating high-salinity wastewater, and provides a foundation for further treatment of industrial wastewater.
Description
Technical Field
The invention belongs to the field of chemical industry, and relates to a method for treating high-salinity wastewater.
Background
The treatment of high salinity wastewater is always a difficult point in the fields of chemical industry and environmental protection. In various chemical industry, high salinity wastewater containing a large amount of sodium chloride components is often generated, the components are relatively complex, and besides nearly saturated salt (sodium chloride), organic impurities, soluble products, byproducts and the like exist, so that most of conventional purification processes cannot be realized. Generally, the high salinity wastewater can only be treated by distillation, which consumes a large amount of high-grade energy (superheated steam), and has very high requirements on equipment, and high investment and operation costs. Therefore, the method which has low energy consumption and low equipment requirement is adopted to treat and pretreat the high salinity wastewater, and has very important significance in the aspects of chemical industry and environmental protection.
Because the densities of the brine and the fresh water are different, the invention firstly provides a method for treating the high-salinity wastewater by using the gravity dialysis, creatively uses the organic separation layer, and realizes the gradual separation of the water and the salt in the brine by regulating and controlling the density and the affinity degree of the organic separation layer with the water. The specific principle is as follows: when the concentration of concentrated brine produced in chemical production is greater than 15%, its relative specific gravity is above 1.10, and the density of organic solvent chlorobenzene is 1.10, and it is not mutually soluble with water. During standing, the concentrated brine is positioned at the lower layer of chlorobenzene, while the fresh water has a density less than that of chlorobenzene and is positioned at the upper layer of chlorobenzene layer during standing. And phenoxy acetic acid (C)6H5OCH2COOH) is a hydrophilic substance, a compound (C) which forms water of crystallization with water6H5OCH2COOH·0.5H2O) and is soluble in chlorobenzene, and the solubility of phenoxyacetic acid in water is negligible in the presence of chlorobenzene, so that the phenoxyacetic acid-dissolved chlorobenzene can be used as a separation layer to continuously extract water from brine and release the waterThe fresh water without salt floats on the upper layer of the chlorobenzene layer, thereby realizing the separation of water and salt. The whole process can be regarded as a process of dialyzing water through an organic separation layer under the action of gravity, so that the process is named as the 'gravity dialysis method'. The hydrophilic water absorbent phenoxyacetic acid has higher polarity, so the solubility in pure chlorobenzene is lower, and the solubility of chlorobenzene phenoxyacetic acid is improved by adding solvents with higher polarity such as alcohols, so the solubility of organic layers to phenoxyacetic acid can be improved, and the separation capability of a separation layer is improved. The method selects monohydric alcohols with small water solubility, such as octanol, isononyl alcohol and other common chemical raw materials, adjusts the specific gravity of a final organic layer (containing chlorobenzene, alcohol, phenoxyacetic acid and other components) to 1.05-1.10 according to the specific gravity of various alcohols, and the obtained separation layer is suitable for treating concentrated brine.
Disclosure of Invention
The invention aims to provide a method for treating high-salinity wastewater, which uses an organic separation layer containing water-absorbing substances to gradually dialyze fresh water components in saline water to an upper layer under the action of gravity, thereby realizing effective separation of salt and water.
The technical scheme of the invention is as follows:
a process for treating the sewage with high salinity features that the organic solvent with hydroscopic substance dissolved in it is used as separating layer, and the water in saline water is separated out by gravity to concentrate the concentrated water and reuse the fresh water.
The treated saline water has salt content ranging from 160 g/L to saturated saline water.
The method for treating the high-salinity wastewater comprises the following steps of: 85-95 wt% of chlorobenzene, 1-2 wt% of water absorbent and the balance auxiliary components; wherein the water absorbent is phenoxyacetic acid, and the auxiliary component is monohydric alcohol.
In the method for treating the high-salinity wastewater, the monohydric alcohol is hexanol, cyclohexanol, n-octanol, 2-ethylhexanol or isononyl alcohol.
According to the method for treating the high-salinity wastewater, the specific gravity of the separation layer is 1.055-1.097.
The method for treating the high-salinity wastewater comprises the following steps of: saline water (0.3-3.0): 1.
the specific operation method of the high salinity wastewater treatment method is as follows: and uniformly stirring the separation layer and the saline water, standing overnight, and leading out the upper layer of fresh water after the fresh water part forms a water layer above the separation layer, wherein the process can be continuously carried out.
The method for treating the high-salinity wastewater accelerates the separation process by utilizing waste heat resources, and comprises the following specific operation methods: and (3) heating the saline water and the separation layer or the mixture thereof to above 30 ℃ by using a low-quality heat source with the temperature of more than 30 ℃, standing and cooling, and discharging the upper layer of fresh water after the fresh water part forms a water layer above the separation layer, wherein the process can be continuously carried out.
In the method for treating the high-salinity wastewater, the low-quality heat source refers to waste heat commonly used in the industry.
The design idea of the invention is as follows:
the research result shows that the method can effectively realize the water separation of the concentrated brine, namely, under the action of gravity, the water "dialyzes" to penetrate through the organic separation layer, a fresh water layer is formed above the organic layer, and the fresh water layer is continuously led out, so that the separation process can be continuously carried out, and the brine separation is realized.
The invention has the advantages and beneficial effects that:
1. the invention has low energy consumption and low equipment requirement, can be used for pretreating high-salinity wastewater, and provides a foundation for further treatment of industrial wastewater.
2. The invention can heat the brine and the separation layer by utilizing waste heat, and carry out heating and cooling circulation after leading out fresh water, thereby realizing waste heat enhanced gravity dialysis process and accelerating brine separation operation.
3. The fresh water produced by the method is suitable for being recycled as reclaimed water and is also suitable for being discharged after reaching the standard after being further treated by an environment-friendly device.
Detailed Description
In the specific implementation process, the treatment method of the high-salinity wastewater comprises the following steps:
according to the mass percentage, 85% -95% of chlorobenzene, 1% -2% of water absorbent (phenoxyacetic acid) and the rest of auxiliary components (monohydric alcohol) are mixed to prepare a separation layer, the separation layer and saline water (the volume ratio is 0.3-3.0: 1) are uniformly stirred, standing is carried out overnight, after a fresh water part forms a water layer above the separation layer, the upper layer of fresh water is led out, sampling analysis is carried out, and if the requirements of reclaimed water recycling are met, the method can be used for producing phenoxyacetic acid.
The present invention will be described in further detail below with reference to examples.
Example one
The method comprises the steps of injecting 2 tons of wastewater generated in the production process of phenoxyacetic acid into a 5000L enamel kettle, adding 2 tons of separation layer, wherein the salt (sodium chloride) content is 300 g/L, stirring the mixture, standing overnight, observing that an obvious water layer is generated on the upper layer of the separation layer (about 50kg) through a manhole, sampling and analyzing, wherein the salt (sodium chloride) content of the upper layer water is 5 g/L, meeting the requirement of reclaimed water recycling, and being used for the production of phenoxyacetic acid, and the salt content range of the treated saline water is the saturated concentration (311 g/L).
Example two
Injecting 2 tons of wastewater generated in the production process of phenoxyacetic acid into a 5000L enamel kettle, wherein the salt content (sodium chloride) is 300 g/L, adding 600kg of a separation layer, wherein the separation layer comprises 540kg of chlorobenzene, 48kg of cyclohexanol and 12kg of phenoxyacetic acid, and the specific gravity of the separation layer is 1.085, stirring the mixture, standing overnight, observing that an obvious water layer is generated on the upper layer of the separation layer (about 30kg) through a manhole, sampling and analyzing, wherein the salt content (sodium chloride) of the upper layer water is 10 g/L, meets the requirement of reclaimed water recycling, can be used for the production of phenoxyacetic acid, and the salt content range of the treated saline water is saturated concentration (311 g/L).
EXAMPLE III
Injecting 1 ton of mixed wastewater generated in the production process and the washing process of phenoxyacetic acid into a 5000L enamel kettle, wherein the salt (sodium chloride) content is 160 g/L, adding 3000kg of a separation layer, wherein the separation layer comprises 2850kg of chlorobenzene, 120kg of isooctanol and 30kg of phenoxyacetic acid, and the specific gravity of the separation layer is 1.070, stirring the mixture, standing overnight, observing that an obvious water layer is generated on the upper layer of the separation layer (about 110kg) through a manhole, sampling and analyzing, wherein the salt (sodium chloride) content of the upper layer water is 4 g/L, the requirement of reclaimed water recycling is met, and the treated saline water can be used for the production of phenoxyacetic acid, and the salt content range is 180 g/L.
Example four
Taking 2 tons of water sample (wastewater generated in the production process of phenoxyacetic acid) which is treated by repeated gravity dialysis, injecting the water sample into a 5000L enamel kettle, wherein the salt (sodium chloride) content is 260 g/L, adding 1000kg of a separation layer, wherein the composition of the separation layer comprises 850kg of chlorobenzene, 140kg of isononyl alcohol and 10kg of phenoxyacetic acid, and the specific gravity of the separation layer is 1.055, stirring the mixture, standing overnight, observing that an obvious water layer is generated (about 40kg) on the upper layer of the separation layer through a manhole, sampling and analyzing, wherein the salt (sodium chloride) content of the upper layer water is 10 g/L, the requirement of reclaimed water recycling is met, and the water sample can be used for the production of phenoxyacetic acid, and the salt content range of the treated saline water is 270 g/L.
EXAMPLE five
Taking 2 tons of wastewater generated in the production process of phenoxyacetic acid, injecting the wastewater into a 5000L enamel kettle, wherein the salt (sodium chloride) content is saturated, adding 2000kg of a separation layer, wherein the composition of the separation layer is the same as that in the first embodiment, using circulating cooling water to enter a water cooling tower as a heat source, pumping the circulating cooling water into an enamel kettle jacket to heat liquid in the kettle, stirring, stopping heating and cooling when the temperature is raised to 30-35 ℃, observing that an obvious water layer is generated (about 50kg) on the upper layer of the separation layer through a manhole, sampling and analyzing, wherein the salt (sodium chloride) content of the upper layer water is 6 g/L, meeting the requirement of reclaimed water recycling, and the wastewater can be used for the production of phenoxyacetic acid and the treated saline water is still in a saturated state.
The generated fresh water is exported, and the process is repeated, and the results are listed as follows:
| number of times | 1 | 2 | 3 | 4 | 5 |
| Water yield (kg) | 50 | 50 | 50 | 40 | 40 |
| Salt content (g/L) | 6 | 6 | 6 | 8 | 8 |
Comparative example
Injecting 2 tons of wastewater generated in the production process of phenoxyacetic acid into a 5000L enamel reaction kettle, adding 1.5 tons of chlorobenzene, stirring, standing overnight, and observing by a manhole on the next day to generate an anhydrous layer on the chlorobenzene.
The results of the examples and the comparative examples show that the invention utilizes the difference of the densities of the brine, the organic solvent and the fresh water, adds the water-absorbing substance into the solvent to form the separation layer, and gradually separates under the action of gravity, namely the lower layer is the high-salinity wastewater, the middle layer is the organic solvent separation layer, and the upper layer is the fresh water, so that the reclaimed water can be recycled, and the waste heat resource can be used for accelerating the separation process.
Claims (6)
1. A method for treating high salinity wastewater is characterized by comprising the following steps: an organic solvent dissolved with water-absorbing substances is used as a separation layer, water in the brine is separated out under the action of gravity, so that concentrated water is concentrated, and fresh water is recycled;
the separation layer had the composition: 85-95 wt% of chlorobenzene, 1-2 wt% of water absorbent and the balance auxiliary components; wherein the water absorbent is phenoxyacetic acid, and the auxiliary component is monohydric alcohol;
the specific gravity of the separation layer is 1.055-1.097;
the method for accelerating the separation process by utilizing waste heat resources comprises the following specific operation methods: and (3) heating the saline water and the separation layer or the mixture thereof to above 30 ℃ by using a low-quality heat source with the temperature of more than 30 ℃, standing and cooling, and discharging the upper layer of fresh water after the fresh water part forms a water layer above the separation layer, wherein the process can be continuously carried out.
2. The method for treating high salinity wastewater according to claim 1, wherein the treated brine has a salt content ranging from 160 g/L to a saturated brine.
3. The method for treating high salinity wastewater according to claim 1, characterized in that: the monohydric alcohol is hexanol, cyclohexanol, n-octanol, 2-ethylhexanol or isononyl alcohol.
4. The method for treating high salinity wastewater according to claim 1, wherein, the ratio of the separation layer to the brine volume is, the separation layer: brine = (0.3-3.0): 1.
5. the method for treating high salinity wastewater according to claim 1, wherein the specific operating method comprises: and uniformly stirring the separation layer and the saline water, standing overnight, and leading out the upper layer of fresh water after the fresh water part forms a water layer above the separation layer, wherein the process can be continuously carried out.
6. The method for treating high salinity wastewater according to claim 1, wherein, low quality heat source refers to the waste heat commonly found in industry.
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| CN201710953850.7A CN107473291B (en) | 2017-10-13 | 2017-10-13 | Treatment method of high-salinity wastewater |
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| CN201710953850.7A CN107473291B (en) | 2017-10-13 | 2017-10-13 | Treatment method of high-salinity wastewater |
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| CN107473291A CN107473291A (en) | 2017-12-15 |
| CN107473291B true CN107473291B (en) | 2020-07-17 |
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| CN107473291A (en) | 2017-12-15 |
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