CN112850944A - Method for treating waste alkali residue and waste water of ethylene - Google Patents

Method for treating waste alkali residue and waste water of ethylene Download PDF

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CN112850944A
CN112850944A CN202011544518.3A CN202011544518A CN112850944A CN 112850944 A CN112850944 A CN 112850944A CN 202011544518 A CN202011544518 A CN 202011544518A CN 112850944 A CN112850944 A CN 112850944A
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alkali
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ethylene
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CN112850944B (en
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陈建军
王慧丽
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Suzhou Qingran Environmental Protection Technology Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

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Abstract

The invention provides a method for treating waste alkali residue and wastewater of ethylene, which comprises the following steps: s1: introducing the ethylene alkali waste residue wastewater into an advanced oxidation unit containing hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic-matter alkali waste 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 organic-solvent-containing waste alkali liquid; s3: separating organic solvent and alkali liquor from organic solvent-containing waste alkali liquor; 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

Method for treating waste alkali residue and waste water of ethylene
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for treating ethylene alkali waste residue wastewater.
Background
The ethylene waste alkali residue wastewater is mainly acidic gas (mainly H) in ethylene cracking gas washed by fresh alkali liquor in an ethylene cracking gas alkali washing device2S、CO2) The pollutants in the waste water of the ethylene alkali waste residue are mainly sulfides, phenols, organic mercaptan, thioether and the like with strong alkalinity. The property of the ethylene alkali waste residue wastewater is complex and variable, and the ethylene alkali waste residue wastewater is difficult to treat by a conventional biochemical method, becomes a restriction factor for standard discharge of the wastewater of an oil refinery, and is also a main stink pollution source of the wastewater.
In recent years, a great deal of research work is carried out on the treatment of the alkaline residue wastewater by many petroleum refining manufacturers and scientific research institutes at home and abroad, and at present, two combined processes of acidification neutralization method + biological treatment and wet air oxidation method + biological treatment are more applied. For the ethylene alkali waste residue wastewater, because 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 running cost of the treatment process are high, and the treatment of the high-concentration sodium sulfide wastes resources.
Chinese patent application No. CN104045210A discloses a method for treating and recycling sewage of an oil refining-ethylene combined device. The method comprises the steps of mixing the waste water with circulating cooling water after wet oxidation and SBR treatment, mixing the waste water with acid-base waste water after an aeration biological filter and advanced oxidation, and discharging; mixing the waste water with the salt content less than or equal to 500mg/L, sequentially treating the waste water by an oil separation tank, an air flotation tank, a biochemical tank and an aeration biological filter tank, sterilizing and filtering the waste water, and recycling the waste water in a circulating cooling water system. But the method has complex flow, large floor area and high construction cost.
In view of the above, there is a need to improve the existing method for treating the waste water of ethylene alkali waste residue to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for treating waste alkali residue and wastewater of ethylene.
In order to realize the aim, the invention provides a method for treating the waste alkali residue and wastewater of ethylene, which comprises the following steps:
s1: introducing the ethylene alkali waste residue wastewater into an advanced oxidation unit containing hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic-matter alkali waste 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 organic-solvent-containing waste alkali liquid;
s3: separating organic solvent and alkali liquor from organic solvent-containing waste alkali liquor.
As a further improvement of the present invention, step S1 specifically includes: and introducing the ethylene alkali waste 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 solution in step S1 is 30%.
As a further improvement of the present invention, the hydrogen peroxide addition amount in step S1 is: COD is 0.4: 1.
As a further improvement of the present invention, the ozone addition amount in step S1 is: COD is 0.3-0.5: 1.
As a further improvement of the invention, between the step S1 and the step S2, the method for treating the ethylene alkali waste residue wastewater further comprises the following steps: and introducing the low-organic-matter waste alkali residue liquid into an activated carbon adsorption unit to further remove organic matters.
As a further improvement of the invention, in step S2, the volume ratio of the low organic waste alkali residue liquid to the organic solvent is 1: 2.5.
as a further improvement of the invention, between the step S1 and the step S2, the method for treating the ethylene alkali waste residue wastewater further comprises the following steps: and introducing the low-organic-matter waste alkali residue liquid into an evaporator concentration unit, so that the salt content in the low-organic-matter waste alkali residue liquid is between 30 and 40 percent.
As a further improvement of the present invention, after step S3, the method for treating the waste alkali residue wastewater of ethylene further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device.
As a further improvement of the present invention, after step S3, the method for treating the waste alkali residue wastewater of ethylene further comprises the following steps: and introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporated liquid, and introducing the evaporated liquid into a microbial treatment unit to further remove organic matters in the evaporated liquid.
The invention has the beneficial effects that: according to the method for treating the waste water of the ethylene alkali waste residue, volatile phenols, mercaptan, thioether and other organic matters in the waste water of the ethylene alkali waste residue are removed through the advanced oxidation unit, and salts such as sodium sulfide and other salts in the waste ethylene alkali residue are removed through the organic solvent extraction by the spraying salt precipitation device, so that the method is simple in process, low in energy consumption and easy for subsequent biochemical treatment, and high-purity sodium hydroxide can be obtained for recycling, resource waste is avoided, and the cost is reduced; meanwhile, organic matters in the ethylene waste alkali residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that biochemical treatment of the organic matters is difficult due to the fact that a large amount of inorganic salts are generated by acid-base neutralization is solved.
Drawings
FIG. 1 is a flow chart of the method for treating waste alkali residues and wastewater of ethylene production according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
The invention provides a method for treating waste alkali residue and wastewater of ethylene, which comprises the following steps:
s1: introducing the ethylene alkali waste residue wastewater into an advanced oxidation unit containing hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic-matter alkali waste 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 organic-solvent-containing waste alkali liquid;
s3: separating organic solvent and alkali liquor from organic solvent-containing waste alkali liquor.
According to the invention, the organic matters such as volatile phenol, mercaptan, thioether and the like in the waste ethylene alkali waste residue wastewater are removed through the advanced oxidation unit, and the salts such as sodium sulfide and the like in the waste ethylene alkali residue are 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, the resource waste is avoided, and the cost is reduced.
Meanwhile, organic matters in the ethylene waste alkali residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that biochemical treatment of the organic matters is difficult due to the fact that a large amount of inorganic salts are generated by acid-base neutralization is solved.
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 includes first retort, be used for to add the hydrogen peroxide jar of hydrogen peroxide in the first retort, first retort is equipped with hydrogen peroxide inlet, exhaust outlet, is used for introducing ethylene alkali waste residue waste water's first inlet, supplies the first liquid outlet of ethylene alkali waste residue waste water exhaust after handling.
It is to be understood that the hydrogen peroxide oxidation unit is not limited to include 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 residue 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 necessary.
Further, step S1 is specifically: and introducing the ethylene alkali waste residue wastewater into the hydrogen peroxide oxidation unit for treatment, and then introducing the ethylene alkali waste residue wastewater into the ozone oxidation unit.
In the step S1, the ethylene alkali waste residue wastewater with high chemical oxygen demand COD can be efficiently decomposed by combining two advanced oxidation technologies of hydrogen peroxide oxidation and ozone oxidation, so that the ethylene alkali waste residue wastewater is converted into biodegradable substances with low toxicity or no toxicity, the subsequent treatment of a microbial treatment unit is facilitated, the treatment efficiency of the ethylene alkali waste 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, the hydrogen peroxide addition amount in step S1 is: COD is 0.4:1, so that the aim of removing COD with high efficiency is fulfilled.
Further, the ozone addition amount in step S1: the COD is 0.3-0.5: 1, and the aim of removing the COD with high efficiency is fulfilled.
Further, between the step S1 and the step S2, the method for treating the waste alkali residues and wastewater of ethylene further comprises the following steps: sa: and introducing the low-organic-matter waste alkali residue liquid into an activated carbon adsorption unit to further remove organic matters.
It can be understood that the low organic matter waste alkali residue liquid is still called as the low organic matter waste alkali residue liquid after being treated by the activated carbon adsorption unit.
Specifically, the active carbon adsorption unit includes active carbon adsorption jar, be used for to add the active carbon holding vessel of active carbon in the active carbon adsorption jar, the active carbon adsorption jar include with the third liquid inlet that the second liquid outlet is linked together, be used for supplying the ethylene spent caustic sludge waste water exhaust third liquid outlet after handling, supply the active carbon discharge port of spent carbon exhaust.
Specifically, in the using process, the low organic matter waste alkali residue liquid can flow through the activated carbon adsorption tank, and the organic matters in the low organic matter waste alkali residue liquid are adsorbed in the pores of the activated carbon, so that the organic matters in the ethylene waste alkali residue liquid can be effectively removed. Further reducing the content of organic matters in the low-organic-matter waste alkali residue liquid and improving the treatment effect.
Furthermore, the activated carbon adsorption unit also comprises an activated carbon treatment tank communicated with the activated carbon discharge port, after the waste activated carbon enters the activated carbon treatment tank, ozone is introduced into the activated carbon treatment tank to regenerate the activated carbon, the regeneration rate can reach at least 50%, and the regenerated activated carbon can be introduced into the activated carbon adsorption tank for recycling, so that the cost is reduced, and the waste is reduced.
Further, between the step S1 and the step S2, the method for treating the waste alkali residues and wastewater of ethylene further comprises the following steps: sb: and introducing the low-organic-matter waste alkali residue liquid into an evaporator concentration unit to ensure that the salt content in the low-organic-matter waste alkali residue liquid is between 30 and 40 percent, thereby obtaining the high-salt low-organic-matter waste alkali residue liquid. On one hand, the salt concentration in the low organic matter waste alkali residue liquid is improved, which is beneficial to the extraction in the step S2; on the other hand, the consumption of the organic solvent in the step S2 is saved, and the cost is reduced.
It is understood that in the embodiment including the step Sa between the steps S1 and S2, the step Sb is located after the step Sa.
In one embodiment, the organic solvent in step S2 is ethanol, which is non-toxic and harmless, and reduces pollution.
Specifically, the spraying salting-out device comprises a mixing cylinder, a spray head arranged above the mixing cylinder, and a stirring rod arranged below the spray head, wherein an organic solvent inlet and an organic solvent outlet are formed in the mixing cylinder, and the spray head is communicated with the third liquid outlet.
After the low organic matter waste alkali residue liquid is sprayed out of the spray header, the low organic matter waste alkali residue liquid is stirred and mixed with the organic solvent under the action of the stirring rod, so that the organic solvent is fully contacted with the low organic matter waste alkali residue liquid, and inorganic salt is separated out from the low organic matter waste alkali residue liquid under the action of the organic solvent to form a solid-liquid mixture; then separating the solid-liquid mixture to obtain the solid-phase mixed inorganic salt and the organic solvent-containing waste lye. The obtained solid-phase mixed inorganic salt can be treated by filter pressing and landfill.
Further, in step S2, the volume ratio of the low organic waste alkali residue liquid to the organic solvent is 1: and 2.5, precipitating salts such as sodium sulfide and the like in the low organic matter waste alkali residue liquid as much as possible.
Specifically, step S3 specifically includes: introducing the organic solvent-containing waste alkali liquor into a rectifying tower, and separating out 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 herein.
Further, after step S3, the method for treating the waste alkali residues of ethylene wastewater further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device. The organic solvent is repeatedly utilized, so that the resource waste is avoided, and the cost is reduced.
Further, after step S3, the method for treating the waste alkali residues of ethylene wastewater further comprises the following steps: and introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporated liquid, and introducing the evaporated liquid into a microbial treatment unit to further remove organic matters in the evaporated liquid.
The structure of the distillation concentration unit is not particularly limited herein, and it is understood that the distillation concentration unit can achieve 30% of liquid caustic product by distillation and the evaporation of the liquid caustic.
The following will explain the treatment results of Ningxia ethylene alkali residue wastewater by using the method for treating ethylene alkali residue wastewater of the present invention in specific embodiments; of course, it is to be understood that the embodiments of the present invention are not limited to these embodiments.
Specifically, the water quality of the raw water of the Ningxia ethylene alkaline residue wastewater is shown in the following table:
Figure BDA0002855578540000061
in the first embodiment of the invention, the Ningxia ethylene alkali residue wastewater COD is 120000mg/L, the ammonia nitrogen is 50mg/L, and the total salt content is 90g/L, specifically, the Ningxia ethylene alkali residue wastewater treatment method comprises the following steps:
leading the Ningxia ethylene alkali residue wastewater into an oxidation and oxidation unit which adds hydrogen peroxide according to 40 percent of COD for treatment, and then treating the Ningxia ethylene alkali residue wastewater by an ozone oxidation unit with the ozone adding amount of 30 to 50 percent of the COD to obtain the low organic matter waste alkali residue liquid with the COD of 40000 and 42000mg/L, wherein the COD contribution value of sulfide and sodium thiosulfate is 37000 mg/L;
introducing the low-organic-matter waste alkali residue liquid into an evaporator concentration unit for evaporation concentration, and concentrating by 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 VHigh-salt low-organic-matter waste alkali residue liquid：VEthanol＝1：2.5；
Carrying out filter pressing on the solid-phase mixed inorganic salt and then carrying out landfill treatment;
introducing the waste alkali liquor containing ethanol into a rectifying tower, rectifying the distilled ethanol and alkali liquor, wherein the ethanol reflows to a spray salting-out 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 evaporated liquid, and introducing the evaporated liquid into a subsequent microbial treatment unit for biochemical treatment.
In the second embodiment of the invention, the COD of the Ningxia ethylene alkaline residue wastewater is 158000mg/L, the ammonia nitrogen is 70mg/L, and the total salt content is 115g/L, and specifically, the Ningxia ethylene alkaline residue wastewater treatment method comprises the following steps:
leading the Ningxia ethylene alkali residue wastewater into an oxidation and oxidation unit which adds hydrogen peroxide according to 40 percent of COD for treatment, and then treating the Ningxia ethylene alkali residue wastewater by an ozone oxidation unit with the ozone adding amount of 30 to 50 percent of the COD to obtain the low organic matter waste alkali residue liquid with the COD of 50000-52000mg/L, wherein the COD contribution value of sulfide and sodium thiosulfate is 44000 mg/L;
introducing the low-organic-matter waste alkali residue liquid into an evaporator concentration unit for evaporation concentration, and concentrating by 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; v, high-salt low-organic-matter waste alkali residue liquid: v ethanol ═ 1: 2.5;
carrying out filter pressing on the solid-phase mixed inorganic salt and then carrying out landfill treatment;
introducing the waste alkali liquor containing ethanol into a rectifying tower, rectifying the distilled ethanol and alkali liquor, wherein the ethanol reflows to a spray salting-out 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 evaporated liquid, and introducing the evaporated liquid into a subsequent microbial treatment unit for biochemical treatment.
In summary, in the method for treating the waste water of the waste alkali residues of ethylene, the organic matters such as volatile phenol, mercaptan and thioether in the waste water of the waste alkali residues of ethylene are removed by the advanced oxidation unit, and the salts such as sodium sulfide in the waste alkali residues of ethylene are removed by the organic solvent extraction by the spraying salt precipitation device, so that the method has the advantages of simple process, low energy consumption, easy subsequent biochemical treatment, and capability of obtaining high-purity sodium hydroxide for recycling, resource waste is avoided, and the cost is reduced; meanwhile, organic matters in the ethylene waste alkali residue wastewater are removed through the advanced oxidation unit, and compared with the prior art, the problem that biochemical treatment of the organic matters is difficult due to the fact that a large amount of inorganic salts are generated by acid-base neutralization is solved.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (10)

1. A method for treating waste alkali residue and waste water of ethylene is characterized by comprising the following steps: the method for treating the ethylene alkali waste residue wastewater comprises the following steps:
s1: introducing the ethylene alkali waste residue wastewater into an advanced oxidation unit containing hydrogen peroxide and ozone to degrade organic matters, and obtaining low-organic-matter alkali waste 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 organic-solvent-containing waste alkali liquid;
s3: separating organic solvent and alkali liquor from organic solvent-containing waste alkali liquor.
2. The method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: step S1 specifically includes: and introducing the ethylene alkali waste residue wastewater into a hydrogen peroxide oxidation unit with hydrogen peroxide for treatment, and then introducing into an ozone oxidation unit with ozone.
3. The method for treating the waste alkali residues and wastewater of ethylene as claimed in claim 1 or 2, wherein: the hydrogen peroxide content in the hydrogen peroxide solution in step S1 was 30%.
4. The method for treating the waste alkali residues and wastewater of ethylene as claimed in claim 1 or 2, wherein: the adding amount of the hydrogen peroxide in the step S1 is as follows: COD is 0.4: 1.
5. The method for treating the waste alkali residues and wastewater of ethylene as claimed in claim 1 or 2, wherein: ozone addition amount in step S1: COD is 0.3-0.5: 1.
6. The method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: between the step S1 and the step S2, the method for treating the ethylene alkali waste residue wastewater further comprises the following steps: and introducing the low-organic-matter waste alkali residue liquid into an activated carbon adsorption unit to further remove organic matters.
7. The method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: in step S2, the volume ratio of the low organic waste alkali residue liquid to the organic solvent is 1: 2.5.
8. the method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: between the step S1 and the step S2, the method for treating the ethylene alkali waste residue wastewater further comprises the following steps: and introducing the low-organic-matter waste alkali residue liquid into an evaporator concentration unit, so that the salt content in the low-organic-matter waste alkali residue liquid is between 30 and 40 percent.
9. The method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: after the step S3, the method for treating the waste ethylene alkali dreg wastewater further comprises the following steps: and refluxing the separated organic solvent to a spraying salt precipitation device.
10. The method for treating waste alkali residues and wastewater of ethylene as claimed in claim 1, wherein: after the step S3, the method for treating the waste ethylene alkali dreg wastewater further comprises the following steps: and introducing the separated alkali liquor into a distillation concentration unit to obtain a liquid alkali product with the alkali content of 30% and an evaporated liquid, and introducing the evaporated liquid into a microbial treatment unit to further remove organic matters in the evaporated liquid.
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CN102452759A (en) * 2010-10-18 2012-05-16 新疆大学 Technology for treating gasoline alkali residues
CN102452763A (en) * 2010-10-25 2012-05-16 中国石油化工股份有限公司 Method for treating ethylene waste alkali liquor
CN104045210A (en) * 2011-10-13 2014-09-17 中国石油化工股份有限公司 Method for treating and recycling sewage of integrated oil-ethylene refining device
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