CN112850944B - Treatment method of ethylene waste caustic sludge wastewater - Google Patents
Treatment method of ethylene waste caustic sludge wastewater Download PDFInfo
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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
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- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
- C02F1/265—Desalination
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
Abstract
The invention provides a method for treating ethylene waste alkali residue wastewater, which comprises the following steps: s1: introducing ethylene waste alkali residue wastewater into a high-grade oxidation unit with hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic matter waste alkali residue liquid; s2: introducing the low-organic matter waste alkali residue liquid into a spraying salt precipitation device with an organic solvent to obtain solid-phase mixed inorganic salt and waste alkali liquid containing the organic solvent; s3: separating the organic solvent and the alkali liquor from the waste alkali liquor containing the organic solvent; the method has the advantages of simple flow, low energy consumption, easy subsequent biochemical treatment, and capability of obtaining high-purity sodium hydroxide for recycling, avoiding resource waste and reducing cost.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for treating ethylene waste caustic sludge wastewater.
Background
The ethylene waste caustic sludge wastewater is mainly ethylene pyrolysis gas alkaline washing device which utilizes fresh alkali liquor to wash acid gas (mainly H) in pyrolysis gas 2 S、CO 2 ) The pollutants in the ethylene waste alkali residue wastewater are mainly sulfides, phenols, organic mercaptans, sulfides and the like which have strong alkalinity. The ethylene waste alkali residue wastewater has complex and changeable properties, is difficult to treat by a conventional biochemical method, becomes a constraint factor for standard emission of the refinery wastewater, and is also a main malodor pollution source.
In recent years, many petroleum refining manufacturers and scientific research institutions at home and abroad have made a great deal of research work on the treatment of alkaline residue wastewater, and currently, a large number of combined processes including an acidification neutralization method, biological treatment and wet air oxidation method and biological treatment are applied. Aiming at the ethylene waste alkali residue wastewater, as the COD concentration is mainly the sulfide contribution value, a mild wet oxidation (sulfuric acid neutralization) process is generally selected. However, the investment and the operation cost of the treatment process are large, and the treatment of the high-concentration sodium sulfide has the condition of resource waste.
Chinese patent application No. CN104045210a discloses a method for treating and recycling sewage from oil refining-ethylene combined plant. The method comprises the steps of wet oxidation and SBR treatment, mixing with circulating cooling water sewage, performing advanced oxidation in a biological aerated filter, mixing with acid-base wastewater, and discharging; mixing the wastewater with the salt content less than or equal to 500mg/L, sequentially treating the wastewater by an oil separation tank, an air floatation tank, a biochemical tank and a biological aerated filter tank, sterilizing and filtering the wastewater, and recycling the wastewater in a circulating cooling water system. However, the method has the advantages of complex flow, large occupied area and high construction cost.
In view of this, there is a need for improvements in the existing methods for treating ethylene caustic sludge wastewater to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a method for treating ethylene waste caustic sludge wastewater.
In order to achieve the aim of the invention, the invention provides a method for treating ethylene caustic sludge wastewater, which comprises the following steps:
s1: introducing ethylene waste alkali residue wastewater into a high-grade oxidation unit with hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic matter waste alkali residue liquid;
s2: introducing the low-organic matter waste alkali residue liquid into a spraying salt precipitation device with an organic solvent to obtain solid-phase mixed inorganic salt and waste alkali liquid containing the organic solvent;
s3: separating the organic solvent and the alkali liquor from the waste alkali liquor containing the organic solvent.
As a further improvement of the present invention, step S1 is specifically: introducing the ethylene waste alkali residue wastewater into a hydrogen peroxide oxidation unit with hydrogen peroxide for treatment, and then introducing into an ozone oxidation unit with ozone.
As a further improvement of the present invention, the hydrogen peroxide content in the hydrogen peroxide in step S1 is 30%.
As a further improvement of the invention, the hydrogen peroxide is added in the step S1: cod=0.4:1.
As a further improvement of the present invention, the ozone addition amount in step S1: cod=0.3 to 0.5:1.
As a further improvement of the invention, the treatment method of the ethylene caustic sludge wastewater between the step S1 and the step S2 further comprises the following steps: and introducing the low-organic matter alkali waste residue liquid into an activated carbon adsorption unit to further remove organic matters.
As a further improvement of the invention, the volume ratio of the low organic matter waste alkali residue liquid to the organic solvent in the step S2 is 1:2.5.
as a further improvement of the invention, the treatment method of the ethylene caustic sludge wastewater between the step S1 and the step S2 further comprises the following steps: introducing the low-organic matter alkali waste residue liquid into an evaporator concentration unit, so that the salt content in the low-organic matter alkali waste residue liquid is between 30 and 40 percent.
As a further improvement of the invention, after step S3, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device.
As a further improvement of the invention, after step S3, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporation liquid, and introducing the evaporation liquid into a microorganism treatment unit to further remove organic matters in the evaporation liquid.
The beneficial effects of the invention are as follows: in the treatment method of the ethylene waste alkaline residue wastewater, the organic matters such as volatile phenol, mercaptan and thioether in the ethylene waste alkaline residue wastewater are removed through the advanced oxidation unit, and the sodium sulfide and other salts in the ethylene waste alkaline residue are removed through the organic solvent extraction by the spray salt precipitation device, so that the flow is simple, the energy consumption is low, the subsequent biochemical treatment is easy, and the high-purity sodium hydroxide can be obtained for recycling, so that the resource waste is avoided, and the cost is reduced; meanwhile, organic matters in the ethylene waste alkaline residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that organic matters are difficult to biochemically treat due to the fact that a large amount of inorganic salts are generated in acid-base neutralization is avoided.
Drawings
FIG. 1 is a flow chart of a method for treating ethylene caustic sludge wastewater in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to specific embodiments.
The invention provides a method for treating ethylene waste alkali residue wastewater, which comprises the following steps:
s1: introducing ethylene waste alkali residue wastewater into a high-grade oxidation unit with hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic matter waste alkali residue liquid;
s2: introducing the low-organic matter waste alkali residue liquid into a spraying salt precipitation device with an organic solvent to obtain solid-phase mixed inorganic salt and waste alkali liquid containing the organic solvent;
s3: separating the organic solvent and the alkali liquor from the waste alkali liquor containing the organic solvent.
According to the invention, the organic matters such as volatile phenol, mercaptan and thioether in the ethylene waste alkali residue waste water are removed through the advanced oxidation unit, and the salt such as sodium sulfide in the ethylene waste alkali residue is removed through the organic solvent extraction by the spraying salt precipitation device, so that the process is simple, the energy consumption is low, the subsequent biochemical treatment is easy, and the high-purity sodium hydroxide can be obtained for recycling, thereby avoiding the waste of resources and reducing the cost.
Meanwhile, organic matters in the ethylene waste alkaline residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that organic matters are difficult to biochemically treat due to the fact that a large amount of inorganic salts are generated in acid-base neutralization is avoided.
Further, the advanced oxidation unit comprises a hydrogen peroxide oxidation unit and an ozone oxidation unit which are communicated with each other.
Specifically, the hydrogen peroxide oxidation unit comprises a first reaction tank and a hydrogen peroxide tank for adding hydrogen peroxide into the first reaction tank, wherein the first reaction tank is provided with a hydrogen peroxide adding inlet, a waste gas outlet, a first liquid inlet for introducing ethylene waste alkali residue waste water and a first liquid outlet for discharging treated ethylene waste alkali residue waste water.
It is to be understood that the hydrogen peroxide oxidizing unit is not limited to the first reaction tank and the hydrogen peroxide tank, and other structures, such as a pH meter, may be added as needed.
The ozone oxidation unit comprises a second reaction tank, an ozone tank for storing ozone and a lifting pump for introducing the ozone in the ozone tank into the second reaction tank, wherein the second reaction tank is provided with a second liquid inlet communicated with the first liquid outlet and a second liquid outlet for discharging low-organic matter waste alkali slag liquid obtained after treatment.
It is to be understood that the ozone oxidation unit is not limited to include the second reaction tank, the ozone tank, and the like, and other structures may be added as needed.
Further, the step S1 specifically includes: and introducing the ethylene waste alkali residue wastewater into the hydrogen peroxide oxidation unit for treatment, and then introducing the ethylene waste alkali residue wastewater into the ozone oxidation unit.
In the step S1, two advanced oxidation technologies of hydrogen peroxide oxidation and ozone oxidation are compounded, so that the ethylene waste alkali residue wastewater with high chemical oxygen demand COD can be efficiently decomposed, the ethylene waste alkali residue wastewater is converted into a biodegradable substance with low toxicity or no toxicity, the subsequent microbial treatment unit treatment is facilitated, the treatment efficiency of the ethylene waste alkali residue wastewater can be effectively improved, and the application range is wide.
Further, the hydrogen peroxide content in the hydrogen peroxide in step S1 is 30%.
Further, in step S1, the hydrogen peroxide is added in an amount of: COD=0.4:1, and achieves the aim of efficiently removing COD.
Further, in step S1, ozone addition amount: COD=0.3-0.5:1, and the purpose of efficiently removing COD is achieved.
Further, between the step S1 and the step S2, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: sa: and introducing the low-organic matter alkali waste residue liquid into an activated carbon adsorption unit to further remove organic matters.
It is understood that the low organic matter caustic sludge liquid after being treated by the activated carbon adsorption unit is still referred to as low organic matter caustic sludge liquid.
Specifically, the activated carbon adsorption unit comprises an activated carbon adsorption tank and an activated carbon storage tank for adding activated carbon into the activated carbon adsorption tank, wherein the activated carbon adsorption tank comprises a third liquid inlet communicated with the second liquid outlet, a third liquid outlet for discharging treated ethylene waste alkali residue wastewater and an activated carbon discharge outlet for discharging waste activated carbon.
Specifically, in the use process, the low-organic matter alkaline waste liquid can flow through the activated carbon adsorption tank, and the organic matters in the low-organic matter alkaline waste liquid are adsorbed in the pores of the activated carbon, so that the organic matters in the ethylene alkaline waste liquid can be effectively removed. Further reduces the content of organic matters in the low-organic matter waste alkali slag liquid and improves the treatment effect.
Further, the activated carbon adsorption unit further comprises an activated carbon treatment tank communicated with the activated carbon discharge port, and after the waste activated carbon enters the activated carbon treatment tank, ozone is introduced into the activated carbon treatment tank so as to regenerate the activated carbon, so that the regeneration rate of at least 50% can be achieved, and the regenerated activated carbon can be introduced into the activated carbon adsorption tank for reuse, thereby reducing the cost and reducing the waste.
Further, between the step S1 and the step S2, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: sb: and introducing the low-organic matter alkali waste liquid into an evaporator concentration unit to ensure that the salt content in the low-organic matter alkali waste liquid is between 30 and 40 percent, thereby obtaining the high-salt low-organic matter alkali waste liquid. On one hand, the salt concentration in the low-organic matter waste alkali slag liquid is improved, so that the extraction in the step S2 is facilitated; on the other hand, the consumption of the organic solvent in the step S2 is saved, and the cost is reduced.
It will be appreciated that in embodiments including step Sa between step S1 and step S2, step Sb is located after step Sa.
In one embodiment, the organic solvent in step S2 is ethanol, which is non-toxic and harmless, and reduces pollution.
Specifically, spray salting device includes the mixing drum, locates the shower head of mixing drum top, locate the puddler of shower head below, be provided with organic solvent inlet, organic solvent liquid outlet on the mixing drum, the shower head with the third liquid outlet is linked together.
After the low-organic matter alkali waste residue liquid is sprayed out of the spray header, stirring and mixing the low-organic matter alkali waste residue liquid with an organic solvent under the action of the stirring rod, so that the organic solvent and the low-organic matter alkali waste residue liquid are fully contacted, and inorganic salt is favorably separated out of the low-organic matter alkali waste residue liquid under the action of the organic solvent to form a solid-liquid mixture; and then separating the solid-liquid mixture to obtain the solid-phase mixed inorganic salt and the waste alkali liquid containing the organic solvent. The obtained solid phase mixed inorganic salt can be subjected to pressure filtration landfill treatment.
Further, in the step S2, the volume ratio of the low organic matter waste alkali slag liquid to the organic solvent is 1:2.5, precipitating as much as possible of salt such as sodium sulfide in the low-organic matter waste alkaline residue liquid.
Specifically, step S3 is specifically: introducing the waste alkali liquor containing the organic solvent into a rectifying tower, and separating the organic solvent and the alkali liquor.
The structure of the rectifying tower can adopt the structure of the rectifying tower in the prior art, and the details are not repeated here.
Further, after the step S3, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device. So as to recycle the organic solvent, avoid the waste of resources and reduce the cost.
Further, after the step S3, the method for treating the ethylene caustic sludge wastewater further comprises the following steps: introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporation liquid, and introducing the evaporation liquid into a microorganism treatment unit to further remove organic matters in the evaporation liquid.
The structure of the distillation concentration unit is not particularly limited herein, and it is understood that the distillation concentration unit may be capable of obtaining 30% liquid alkali product and evaporation liquid by distillation.
The treatment results of treating Ningxia ethylene caustic sludge wastewater by the treatment method of ethylene caustic sludge wastewater in the present invention will be described in specific examples; of course, it is to be understood that the embodiments of the invention are not limited to these embodiments.
Specifically, the raw water quality of the Ningxia ethylene caustic sludge wastewater is shown in the following table:
in the first embodiment of the invention, the COD of the Ningxia ethylene caustic sludge wastewater is 120000mg/L, the ammonia nitrogen is 50mg/L, the total salt content is 90g/L, and specifically, the treatment process of the Ningxia ethylene caustic sludge wastewater comprises the following steps:
introducing Ningxia ethylene caustic sludge wastewater into a hydrogen oxide unit for treatment according to 40% of COD, and then treating the wastewater by an ozone oxidation unit with ozone addition amount of 30% -50% of COD to obtain low-organic matter caustic sludge liquid with COD of 40000-42000mg/L, wherein the COD contribution value of sulfide and sodium thiosulfate is 37000mg/L;
introducing the low-organic matter waste alkali residue liquid into an evaporator concentration unit for evaporation concentration, wherein the concentration is multiple times until the salt content of the low-organic matter waste alkali residue liquid is 30% -40%, so as to obtain high-salt low-organic matter waste alkali residue liquid;
introducing the high-salt low-organic matter waste alkali residue liquid into a spraying salt precipitation device added with ethanol to obtain solid-phase mixed inorganic salt and ethanol-containing waste alkali liquid; wherein V is High-salt low-organic matter waste alkali residue liquid ：V Ethanol =1：2.5；
Carrying out pressure filtration on the solid phase mixed inorganic salt, and then carrying out landfill treatment;
introducing ethanol-containing waste alkali liquor into a rectifying tower, rectifying ethanol and alkali liquor, wherein the ethanol reflows to a spray salt precipitation device for reuse, introducing the separated alkali liquor into a distillation concentration unit for re-evaporation to obtain a liquid alkali product with the alkali content of 30% and an evaporation liquid, and introducing the evaporation liquid into a subsequent microorganism treatment unit for biochemical treatment.
In the second embodiment of the invention, the COD of the Ningxia ethylene caustic sludge wastewater is 158000mg/L, the ammonia nitrogen is 70mg/L, the total salt content is 115g/L, and specifically, the treatment process of the Ningxia ethylene caustic sludge wastewater comprises the following steps:
introducing Ningxia ethylene caustic sludge wastewater into a hydrogen oxide unit for treatment, wherein the hydrogen oxide unit is added with hydrogen peroxide according to 40% of COD, and then treating the wastewater by an ozone oxidation unit with ozone addition amount of 30% -50% of COD to obtain low-organic matter caustic sludge liquid with COD of 50000-52000mg/L, wherein the COD contribution value of sulfide and sodium thiosulfate is 44000mg/L;
introducing the low-organic matter waste alkali residue liquid into an evaporator concentration unit for evaporation concentration, wherein the concentration is multiple times until the salt content of the low-organic matter waste alkali residue liquid is 30% -40%, so as to obtain high-salt low-organic matter waste alkali residue liquid;
introducing the high-salt low-organic matter waste alkali residue liquid into a spraying salt precipitation device added with ethanol to obtain solid-phase mixed inorganic salt and ethanol-containing waste alkali liquid; wherein, V is high-salt low-organic matter waste alkali slag liquid: vethanol=1: 2.5;
carrying out pressure filtration on the solid phase mixed inorganic salt, and then carrying out landfill treatment;
introducing ethanol-containing waste alkali liquor into a rectifying tower, rectifying ethanol and alkali liquor, wherein the ethanol reflows to a spray salt precipitation device for reuse, introducing the separated alkali liquor into a distillation concentration unit for re-evaporation to obtain a liquid alkali product with the alkali content of 30% and an evaporation liquid, and introducing the evaporation liquid into a subsequent microorganism treatment unit for biochemical treatment.
In summary, in the method for treating the ethylene waste caustic sludge wastewater, the high-grade oxidation unit is used for removing volatile phenol, thiol, thioether and other organic matters in the ethylene waste caustic sludge wastewater, and the spraying salt precipitation device is used for removing sodium sulfide and other salts in the ethylene waste caustic sludge through organic solvent extraction, so that the method is simple in flow, low in energy consumption and easy for subsequent biochemical treatment, and high-purity sodium hydroxide can be obtained for recycling, so that resource waste is avoided, and cost is reduced; meanwhile, organic matters in the ethylene waste alkaline residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that organic matters are difficult to biochemically treat due to the fact that a large amount of inorganic salts are generated in acid-base neutralization is avoided.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. A method for treating ethylene waste caustic sludge wastewater is characterized by comprising the following steps: the treatment method of the ethylene waste caustic sludge wastewater comprises the following steps:
s1: introducing the ethylene waste alkali residue wastewater into a hydrogen peroxide oxidation unit with hydrogen peroxide for treatment, and then introducing into an ozone oxidation unit with ozone to obtain low-organic matter waste alkali residue liquid;
introducing the low-organic matter alkali waste residue liquid into an activated carbon adsorption unit to further remove organic matters, wherein the activated carbon adsorption unit comprises an activated carbon adsorption tank, an activated carbon storage tank for adding activated carbon into the activated carbon adsorption tank, and an activated carbon treatment tank communicated with an activated carbon discharge port of the activated carbon adsorption tank, and introducing ozone into the activated carbon treatment tank after the waste activated carbon enters the activated carbon treatment tank;
introducing the low-organic matter waste alkali residue liquid treated by the activated carbon adsorption unit into an evaporator concentration unit, so that the salt content in the low-organic matter waste alkali residue liquid treated by the activated carbon adsorption unit is between 30% and 40%, and obtaining high-salt low-organic matter waste alkali residue liquid;
s2: introducing the high-salt low-organic matter waste alkali residue liquid into a spraying salt precipitation device with an organic solvent to obtain solid-phase mixed inorganic salt and waste alkali liquid containing the organic solvent;
s3: separating the organic solvent and the alkali liquor from the waste alkali liquor containing the organic solvent.
2. The method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: the hydrogen peroxide content in the hydrogen peroxide in step S1 is 30%.
3. The method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: in the step S1, the hydrogen peroxide is added in an amount of: cod=0.4:1.
4. The method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: ozone addition amount in step S1: cod=0.3 to 0.5:1.
5. The method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: in the step S2, the volume ratio of the high-salt low-organic matter waste alkali slag liquid to the organic solvent is 1:2.5.
6. the method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: after the step S3, the treatment method of the ethylene waste alkali residue wastewater further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device.
7. The method for treating ethylene caustic sludge wastewater according to claim 1, characterized by comprising the steps of: after the step S3, the treatment method of the ethylene waste alkali residue wastewater further comprises the following steps: introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporation liquid, and introducing the evaporation liquid into a microorganism treatment unit to further remove organic matters in the evaporation liquid.
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| CN102452759A (en) * | 2010-10-18 | 2012-05-16 | 新疆大学 | Technology for treating gasoline alkali residues |
| CN102452763B (en) * | 2010-10-25 | 2014-04-02 | 中国石油化工股份有限公司 | Method for treating ethylene waste alkali liquor |
| CN104045210B (en) * | 2011-10-13 | 2015-07-29 | 中国石油化工股份有限公司 | The treatment for reuse method of oil refining-Ethylene Complex unit sewage |
| CN105439368B (en) * | 2014-07-31 | 2018-08-17 | 中国石油化工股份有限公司 | A kind of deep treatment method of ethylene waste lye |
| CN106746100B (en) * | 2015-11-19 | 2020-09-11 | 中国石油化工股份有限公司 | Treatment method of ethylene refining waste alkali liquor |
| CN108529819B (en) * | 2018-04-16 | 2021-01-01 | 黄河三角洲京博化工研究院有限公司 | Resource comprehensive utilization method of refined caustic sludge |
| CN109437424A (en) * | 2018-12-24 | 2019-03-08 | 苏州清然环保科技有限公司 | The processing method and processing system of spent lye |
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