CN114716050A - Method for treating and recycling steam stripping purified water of refinery - Google Patents
Method for treating and recycling steam stripping purified water of refinery Download PDFInfo
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- 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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- 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
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- 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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- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/29—Chlorine compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention discloses a method for treating and recycling steam stripping purified water of a refinery. The method comprises the following steps: 1) separating and treating refinery stripped and purified water by using a selective membrane A to obtain a first cut-off liquid and a first permeate liquid, wherein the first cut-off liquid is used as refinery electric desalting process water for recycling, and the first permeate liquid enters a COD removal reactor; 2) adding a compound COD removal reactant into the first permeate to perform COD removal reaction to obtain purified water wastewater; 3) and (3) carrying out liquid-liquid separation on the purified water wastewater by using the selective membrane B to obtain second trapped liquid and second permeate, recycling the second permeate as water for the refinery process or supplementing water by using circulating water, and discharging the second trapped liquid into a refinery sewage treatment plant. The invention ensures that the water quality of effluent at all levels meets the water quality requirements of various process units of an oil refinery, and the amount of sewage which needs to enter a sewage treatment field of the oil refinery is low enough, thereby reducing the load of sewage treatment facilities of the oil refinery and improving the recycling and cascade utilization efficiency of stripped and purified water.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating and recycling steam stripping purified water of a refinery.
Background
When an oil refinery processes sulfur-containing crude oil, process units such as atmospheric and vacuum distillation, catalytic cracking, delayed coking, hydrofining and the like discharge a large amount of acidic water (sulfur-containing sewage), and the total discharge of the acidic water in the process wastewater of the refinery accounts for the highest percentage and can reach more than 50% of the total amount of the process wastewater of the refinery. Acidic water is treated by a steam stripping method in most oil refineries in China, hydrogen sulfide and ammonia in sewage are removed and recovered in a steam stripping mode, and sulfur is recovered from the recovered hydrogen sulfide through a sulfur recovery device. Although the load of pollutants such as sulfur, nitrogen and the like in the purified water obtained by steam stripping treatment is greatly reduced compared with the acid water before treatment, and the purified water has the advantages of low hardness and low salinity, the purified water produced by the acid water stripping device is actually not 'clean', still belongs to refining sewage, contains organic pollutants such as phenols, aniline and the like, and the COD value of the purified water is often over 1000 ppm.
At present, purified water obtained by steam stripping treatment of acid water of an oil refinery is mainly used as electric desalting water injection, but due to the configuration characteristic limitation of each process unit of the oil refinery and the fact that proper pretreatment is not available, the purified water can not be reliably reused as the process water of each process unit of the oil refinery, the efficiency of the reuse or cascade utilization of the purified water is generally difficult to exceed 50%, and the rest of the purified water which can not be reused can only be directly discharged as wastewater to enter a sewage treatment field of the oil refinery, so that great pressure is caused to sewage treatment and environmental standard reaching of a sewage treatment plant, and meanwhile, water resources are not fully utilized, so that the consumption of fresh water is increased.
Disclosure of Invention
The invention aims to provide a method for treating and recycling steam stripping purified water in a refinery so as to reduce the fresh water consumption and the pollution discharge rate of the crude oil processing amount of a unit of an oil refining enterprise.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for treating and recycling refinery stripped and purified water. The method comprises the following steps: 1) separating and treating refinery stripped and purified water by using a selective membrane A to obtain a first cut-off liquid and a first permeate liquid, wherein the first cut-off liquid is used as refinery electric desalting process water for recycling, and the first permeate liquid enters a COD removal reactor; 2) adding a compound COD removal reactant into the first permeate to perform COD removal reaction to obtain purified water wastewater; 3) and (3) carrying out liquid-liquid separation on the purified water wastewater by using the selective membrane B to obtain second trapped liquid and second permeate, recycling the second permeate as water for the refinery process or supplementing water by using circulating water, and discharging the second trapped liquid into a refinery sewage treatment plant.
Furthermore, the selective membrane A is a reverse osmosis membrane or a nanofiltration membrane which has the recovery rate of the steam stripping purified water of the refinery not more than 50 percent.
Further, the selective membrane B is a reverse osmosis membrane or a nanofiltration membrane which has a desalination rate of not less than 99% on the purified water wastewater.
Further, the composite COD removal reactant comprises an A-type medicament, a B-type medicament and a C-type medicament, wherein the A-type medicament is a synthetic catalyst with a similar carbon alkene structure, the B-type medicament is one or more of ozone, air and hydrogen peroxide, and the C-type medicament is sodium sulfite or sodium thiosulfate.
Further, the mass percentage content of the A-class medicament in the composite COD removing reactant is 0.1-3%, the mass percentage content of the B-class medicament in the composite COD removing reactant is 85-98%, and the mass percentage content of the C-class medicament in the composite COD removing reactant is 0.5-2%.
Further, the adding amount of the composite COD removal reactant is 1-10 g/L of the first permeate.
Further, the COD removing reaction also comprises stirring and mixing the reaction system.
Further, the agitation and mixing is one or more of hydraulic agitation, aeration agitation and mechanical agitation.
Further, the time for stirring and mixing is 10min to 90 min.
Furthermore, the content of sulfide in the steam stripping purified water of the refinery is less than or equal to 20ppm, the content of ammonia nitrogen is less than or equal to 50ppm, and the COD is 600 mg/L-2000 mg/L.
By applying the technical scheme of the invention, the combined process of the COD removal reactor and the double-membrane separation (the selective membrane A and the selective membrane B) is applied to the treatment and recycling of the purified water of the refinery acidic water stripping device, the water quality of the effluent at all levels is ensured to meet the water quality requirements of various process devices of an oil refinery, the amount of sewage which needs to enter a sewage treatment field of the oil refinery is low enough, a new technical approach is provided for reducing the load of sewage treatment facilities of the refinery and reducing the fresh water consumption and the pollution discharge rate of the unit crude oil processing amount of oil refining enterprises, and the combined process can be applied to the sewage treatment fields of point source pollution treatment, clean production and the like of the oil refining industry.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic flow diagram of a process for treating and recycling refinery stripped and purified water according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention aims to treat the purified water of the acid water stripping device of the refinery to meet the requirements of relevant indexes of water quality of process water recycled and used in cascade according to the principle of quality-based treatment and quality-based recycling, solves the impact of the purified water on a sewage treatment field of the refinery, improves the recycling rate of the purified water to over 90 percent, and can obviously save the fresh water consumption of the refinery.
The conventional operation of a refinery directly utilizes the characteristic of low salt and low hardness of purified water, and the purified water can be directly reused as inlet water of an electric desalting device without special pretreatment, but the reuse rate of the purified water is low due to the limitation of the water consumption of the electric desalting device.
According to the water quality characteristics of purified water and the water quality requirement of the recycling process, the combined process of the COD removal reactor and the double-membrane separation is firstly provided for treating and recycling purified water of the refinery acid water stripping device, the water quality of effluent at all levels meets the water quality requirements of various process devices of an oil refinery, the amount of sewage which needs to enter a sewage treatment field of the oil refinery is low enough, a new technical approach is provided for reducing the load of sewage treatment facilities of the refinery and reducing the fresh water consumption and the pollution discharge rate of unit crude oil processing amount of oil refining enterprises, and the combined process can be applied to the sewage treatment fields of point source pollution treatment, clean production and the like of the oil refining industry.
According to an exemplary embodiment of the present invention, a method for treating and recycling refinery stripped and purified water is provided. Referring to fig. 1, the method comprises the steps of: 1) separating and treating refinery stripped and purified water by using a selective membrane A to obtain a first cut-off liquid and a first permeate liquid, wherein the first cut-off liquid is used as refinery electric desalting process water for recycling, and the first permeate liquid enters a COD removal reactor; 2) adding a compound COD removal reactant into the first permeate to perform COD removal reaction to obtain purified water wastewater; 3) and (3) carrying out liquid-liquid separation on the purified water wastewater by using the selective membrane B to obtain second trapped liquid and second permeate, recycling the second permeate as water for the refinery process or supplementing water by using circulating water, and discharging the second trapped liquid into a refinery sewage treatment plant. The selective membrane A is used for preliminarily purifying, separating and stripping purified water to obtain concentrated water (first cut-off liquid) meeting the requirements of water for the electric desalting process of a refinery, hardness ions and first permeate for reducing COD concentration; the selective membrane B is used for finally purifying, separating and stripping purified water to obtain second permeate meeting the water quality requirement of refinery process water or circulating water replenishing water and second trapped fluid which can be discharged into a refinery sewage treatment plant; the composite COD removing reactant is used for reducing the COD of the inlet water entering the selective membrane B, and is beneficial to the COD of the water quality treated by the selective membrane B to reach the standard.
By applying the technical scheme of the invention, the combined process of the COD removal reactor and the double-membrane separation (the selective membrane A and the selective membrane B) is applied to the treatment and recycling of the purified water of the refinery acidic water stripping device, the water quality of the effluent at all levels is ensured to meet the water quality requirements of various process devices of an oil refinery, the amount of sewage which needs to enter a sewage treatment field of the oil refinery is low enough, a new technical approach is provided for reducing the load of sewage treatment facilities of the refinery and reducing the fresh water consumption and the pollution discharge rate of the unit crude oil processing amount of oil refining enterprises, and the combined process can be applied to the sewage treatment fields of point source pollution treatment, clean production and the like of the oil refining industry.
Preferably, the selective membrane A is a reverse osmosis membrane or a nanofiltration membrane which has the recovery rate of steam stripping purified water of a refinery not higher than 50 percent; the method realizes the operation of shunting and separating the steam stripping purified water, can meet the requirements of the electric desalting process for the high COD wastewater with qualified hardness, such as concentrated water (trapped liquid), greatly reduces the COD concentration of the permeate liquid, and can meet the water quality requirements of process water or circulating water replenishing water of a refinery through COD removal and selective membrane B treatment.
Preferably, the selective membrane B is a reverse osmosis membrane or a nanofiltration membrane with the desalination rate of the purified water wastewater of not less than 99 percent; can generate permeate liquid meeting the water quality requirement of the process water or the circulating water of the refinery.
According to a typical embodiment of the invention, the compound COD removal reactant comprises an A-type medicament, a B-type medicament and a C-type medicament, wherein the A-type medicament is a synthetic catalyst with a similar carbon olefin structure and is a catalyst for COD oxidation removal reaction; the B-type medicament is one or more of ozone, air and hydrogen peroxide and is an oxidant for COD oxidation removal reaction; the C-type medicament is sodium sulfite or sodium thiosulfate and is a protective agent of the membrane.
Preferably, the mass percentage content of the A-type medicament in the composite COD removing reactant is 0.1-3%, the mass percentage content of the B-type medicament in the composite COD removing reactant is 85-98%, and the mass percentage content of the C-type medicament in the composite COD removing reactant is 0.5-2%. The composite COD removal reactant of the component has good performance and good economic value.
In one embodiment of the invention, the adding amount of the composite COD removal reactant is 1-10 g/L of the first permeate, so that the reaction can be met, and waste caused by excessive addition can be avoided.
Preferably, the COD removing reaction also comprises stirring and mixing the reaction system, and the stirring and mixing is typically one or more of hydraulic mixing, aeration mixing and mechanical stirring; the time for stirring and mixing is 10 min-90 min.
According to a typical embodiment of the invention, the content of sulfide in the steam stripping purified water of the refinery is less than or equal to 20ppm, the content of ammonia nitrogen is less than or equal to 50ppm, and the COD is 600 mg/L-2000 mg/L.
The invention starts from the characteristics of purified water quality and the water quality requirement of a recycling process, utilizes the oxidation degradation COD (chemical oxygen demand) effect and the separation decrement effect of a specially-selected oxidant and a separation membrane to eliminate the specific organic pollutants in the purified water of an acid water stripping device of a refinery according to the principles of clean production and maximum utilization of water resources, reduces the chemical oxygen demand and the corrosion scaling influence of sewage, achieves the optimized treatment recycling effect of the quality-divided recycling of the sewage, does not cause secondary pollution to the sewage, and ensures that the effluent meets the process water requirement of related processes of an oil refinery and the related indexes of the inlet water quality of a sewage treatment field, thereby being an effective technical method for realizing the high-efficiency treatment recycling of the stripped purified water of the refinery and improving the utilization rate of the water resources of oil refining enterprises. The technical method for treating and recycling the purified water can effectively solve the problems that the prior refinery acidic water stripping device is lack of a treatment and recycling technology for the purified water, low in recycling efficiency, easy to cause pollution influence on a sewage treatment plant and the like.
The invention realizes the low-cost and high-efficiency recycling of steam stripping purified water of a refinery, the treated effluent meets the requirements of process water of related processes of the refinery and related indexes of water quality of inlet water of a sewage treatment plant of the refinery, the quality-based treatment and quality-based recycling of sewage are realized, the fresh water consumption and the sewage discharge amount of unit crude oil treatment of oil refining enterprises are reduced, and the comprehensive utilization efficiency of water resources of the oil refining enterprises is improved.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
Raw oil refined by a certain large oil refining enterprise is mainly high-sulfur oil, and in recent years, crude oil entering the oil refining enterprise tends to be inferior (high sulfur and high acid), the product leaving the oil refining enterprise is required to be further clean (low sulfur) by national standards, and the water consumption quota of the oil refining enterprise is continuously reduced by the national multiple rigid constraint, so that the requirement for improving the comprehensive utilization of the water resources of the whole oil refining enterprise is urgent. The acidic water stripping device of enterprise only has the content to sulphide and ammonia nitrogen in the purification water respectively and does not exceed 20ppm and 50ppm restriction, its COD value often exceeds 1400ppm, except can utilizing as the electricity demineralizer process water in cascade, other devices are difficult to the retrieval and utilization by the too high COD concentration of purification water, the rate of utilization of purification water generally does not exceed 45%, even the sewage treatment plant of enterprise also thinks the COD concentration of purification water is on the high side, can cause impact influence to the operation in sewage treatment field, lead to biochemical unit effluent COD to be difficult to satisfy discharge standard up to standard. Enterprises need to increase a purified water treatment and reuse process, so that water conservation and emission reduction are realized, and the utilization efficiency of water resources is improved.
The embodiment provides a method for treating and recycling the purified water of the acidic water stripping device of a certain oil refining enterprise, which specifically comprises the following steps of:
1. the test raw water is taken from the purified water of the acidic water stripping device of the plant;
2. the test raw water enters a selective membrane A (Tow NF90) separation unit, the intercepted concentrated water can meet the water quantity and quality requirements of the process water of the electric desalting device, and the permeate liquid after membrane treatment enters a COD removal reaction processor; the retention rate of concentrated water is about 50 percent;
3. the permeate of the selective membrane A separation unit enters a COD removal reaction processor to remove COD reactant (O) in a compound mode3And H2O2) The adding amount is 5g/L, mechanical stirring is carried out, and the compound COD-removing reactant fluid is ensured to be fully mixed with the test raw water and then is reversely mixedShould be used. The retention time is 45 min;
4, enabling the effluent of the COD removal reaction processor to enter a separation unit of a selective membrane B (Dow BW30), and enabling the stable desalination rate of the sewage to be not less than 99%;
5. the permeate liquid treated by the selective membrane B separation unit can meet the water quality requirement of process water of related processes of an oil refinery and is sent to a process device of the oil refinery, and the intercepted concentrated water enters a sewage treatment field for treatment.
Under the optimized process or test conditions (the selective membrane A is NF90, the water recovery rate is 46 percent, the selective membrane B is BW30, the TDS removal rate is 93 percent, and the dosage of the compound COD removing reactant is 5g/L, wherein the A medicament accounts for 2 percent, and the B medicament accounts for 96 percent (O)3Concentration 3.2g/L, H2O2Concentration 1.6g/L), C-type medicament accounts for 2%), the main water quality indexes of inlet water and outlet water of the purified water treatment and reuse process of the acidic water stripping device are shown in Table 1. Therefore, after the treatment by the method of the embodiment, each strand of effluent of the purified water after the quality-based grading treatment can respectively meet the water quality requirements of different process waters of a refinery, and the reuse rate of the purified water is remarkably improved by nearly 100%.
TABLE 1 pretreatment test results of crude oil electric desalting wastewater
Example 2
Essentially the same as in example 1, optimized process or experimental conditions: the selective membrane A is NF90, and the water recovery rate is 46%; the selective membrane B is BW30, and the TDS removal rate is 91 percent; the dosage of the compound COD removing reactant is 10g/L, wherein the A-class medicament accounts for 0.1 percent, and the B-class medicament accounts for 98 percent (O)3Concentration 5.0g/L, H2O2Concentration is 2.0g/L, air is 3.0g/L), and C medicament accounts for 1.9%.
The main water quality indexes of the inlet water and the treated outlet water are shown in the table 2.
TABLE 2
Example 3
Essentially the same as in example 1, optimized process or experimental conditions: the selective membrane A is NF90, and the water recovery rate is 46%; the selective membrane B was BW30, TDS removal 93%; the dosage of the compound COD removing reactant is 3g/L, wherein the A-class medicament accounts for 3 percent, and the B-class medicament accounts for 96.5 percent (O)3Concentration 1.9g/L, H2O2Concentration 1.0g/L), C class medicine accounts for 0.5%.
The main water quality indexes of the inlet water and the treated outlet water are shown in the table 3.
TABLE 3
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the invention can realize the high-efficiency treatment and recycling of steam stripping purified water of a refinery, the quality-divided treated effluent meets the requirements of process water of related processes of the refinery and related indexes of water quality of inlet water of a sewage treatment field of the refinery, the quality-divided graded recycling is realized, the consumption of fresh water of the refinery can be saved, the load passing of the sewage treatment field of the refinery is reduced, the comprehensive recycling rate and the cascade utilization efficiency of the purified water with the dominant water amount of the sewage of the refinery are enhanced and improved by nearly one time, and thus the comprehensive utilization efficiency of water resources of the refinery is improved.
2. The invention has the advantages of high-efficiency removal of COD, short process flow, compact operation space, simple and reliable operation control, less required medicament amount, no secondary pollution to sewage, reduction of fresh water consumption and drainage of crude oil in refinery units, reduction of load of sewage treatment facilities, reduction of comprehensive sewage treatment cost of oil refining enterprises and improvement of standard reaching rate of environmental treatment of enterprises.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (10)
1. A method for treating and recycling steam stripping purified water of a refinery is characterized by comprising the following steps:
1) separating and treating refinery stripped and purified water by using a selective membrane A to obtain a first cut-off liquid and a first permeate liquid, wherein the first cut-off liquid is reused as refinery electric desalting process water, and the first permeate liquid enters a COD removal reactor;
2) adding a compound COD removal reactant into the first permeate to perform COD removal reaction to obtain purified water wastewater;
3) and carrying out liquid-liquid separation on the purified water wastewater by using a selective membrane B to obtain a second trapped fluid and a second permeate, wherein the second permeate is recycled as process water or circulating water replenishing water of a refinery, and the second trapped fluid is discharged to enter a refinery sewage treatment plant.
2. The method according to claim 1, wherein the selective membrane a is a reverse osmosis membrane or a nanofiltration membrane with a recovery of no more than 50% of the refinery stripped purified water.
3. The method as claimed in claim 1, wherein the selective membrane B is a reverse osmosis membrane or a nanofiltration membrane having a salt rejection rate of not less than 99% for the purified water wastewater.
4. The method according to claim 1, wherein the complex COD removal reactant comprises a group a agent, a group B agent and a group C agent, wherein the group a agent is a synthetic catalyst of a carbonioid structure, the group B agent is one or more of ozone, air and hydrogen peroxide, and the group C agent is sodium sulfite or sodium thiosulfate.
5. The method according to claim 4, wherein the group A agent is present in the composite COD removal reagent in an amount of 0.1-3% by weight, the group B agent is present in the composite COD removal reagent in an amount of 85-98% by weight, and the group C agent is present in the composite COD removal reagent in an amount of 0.5-2% by weight.
6. The method according to claim 5, wherein the adding amount of the composite COD removal reactant is 1-10 g/L of the first permeate.
7. The method according to claim 1, wherein the COD removal reaction further comprises agitating and mixing the reaction system.
8. The method of claim 7, wherein the agitation mixing is one or more of hydraulic mixing, aerated mixing, and mechanical stirring.
9. The method of claim 7, wherein the time for mixing is 10min to 90 min.
10. The method according to claim 1, wherein the content of sulfide in the refinery stripped and purified water is less than or equal to 20ppm, the content of ammonia nitrogen is less than or equal to 50ppm, and the COD is 600 mg/L-2000 mg/L.
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