A method for the renewable treatment of waste emulsions

Abstract

The application discloses a kind of renewable treatment methods of waste emulsion, comprising the following steps: waste emulsion is pretreated;The solution obtained is demulsified;Collect oil phase liquid;Separate fatty acid;Continue electrochemistry-fenton combined advanced oxidation;Coagulation and sedimentation remove precipitate;UASB treatment;A2O treatment;MBR treatment;Discharge after processing.The application can be step by step and effectively recycled or removed in waste emulsion oil, ester, fatty acid soap, surfactant, additive aid, rust inhibitor, so that the final liquid discharge reaches the urban sewage comprehensive discharge standard, the application initiatively improves the whole improvement of waste emulsion processing, fully recycles renewable resources difficult to handle, so that waste emulsion standard treatment is more convenient and feasible.In the application, sulfuric acid and calcium hydroxide are selected, which will not increase the processing difficulty due to the addition of substances, causing secondary pollution, and the addition of acid also provides the best reaction conditions for subsequent combined advanced oxidation treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of emulsion treatment, and particularly relates to a renewable treatment method of waste emulsion. BACKGROUND

[0002] At present, the emulsion for cooling and lubrication is used in the existing machining process, and the emulsion contains various functional components, so that the emulsion has good cooling performance, lubrication performance, anti-rust performance, oil removal and cleaning function, corrosion prevention function and easy dilution.

[0003] In the cutting process, the addition of the emulsion can reduce the friction between the rake face and the chip and the friction between the flank face and the machined surface, form a part of lubricating film, thereby reducing the cutting force, friction and power consumption, and reducing the surface temperature of the friction part of the tool and the workpiece blank and the tool wear.

[0004] However, the waste emulsion produced after machining cannot be directly discharged, and the harm of the emulsion to the environment mainly lies in the pollution to water resources and soil. The waste emulsion usually contains mineral oil, ester, fatty acid soap, surfactant, additive, rust inhibitor and other soluble substances.

[0005] The oil ester is one of the main components of the waste emulsion, has poor biodegradability, can be long-term retained in water and soil, thereby causing pollution to the underground water of the site, possibly for many years, and has lethal toxicity to aquatic organisms, causing the death of freshwater organisms and seawater organisms.

[0006] Therefore, the waste emulsion is treated as a toxic and harmful waste for subsequent treatment.

[0007] At present, there are two common treatment methods for the waste emulsion: the traditional physical and chemical method and the incineration method. The traditional physical and chemical method produces a large amount of oil sludge which still needs incineration treatment, and a large amount of acid and salt is introduced into water, which cannot be biochemically treated. The two methods cannot realize resource recycling. SUMMARY

[0008] The application is proposed to solve the problems in the prior art, and aims to provide a renewable treatment method of waste emulsion.

[0009] The technical scheme of the application is as follows: a renewable treatment method of waste emulsion, comprising the following steps:

[0010] ⅰ. Pre-treating the waste emulsion

[0011] The waste emulsion in the machining production is uniformly collected, the waste emulsion is subjected to solid-liquid separation treatment, a first treatment liquid is obtained, and the chips and sludge are collected;

[0012] ⅱ. Demulsifying the obtained solution

[0013] An emulsion breaker is added to the obtained first treatment liquid to demulsify the first treatment liquid, and a second treatment liquid and an oil phase liquid are obtained;

[0014] ⅲ. Collecting the oil phase liquid

[0015] The oil phase liquid and the second treatment liquid are subjected to liquid-liquid separation, and the oil phase liquid is collected and regenerated;

[0016] ⅳ. Separating fatty acids

[0017] A reaction acid is added to the obtained second treatment liquid to hydrolyze esters and fatty acid soaps into non-water-soluble fatty acids and alcohols, alcohol amines and salts, decompose high-molecular organic substances, and collect the non-water-soluble fatty acids in the second treatment liquid, thereby reducing the difficulty of subsequent treatment and obtaining a third treatment liquid;

[0018] ⅴ. Continuing electrochemical-Fenton combined advanced oxidation treatment

[0019] The obtained third treatment liquid is subjected to electrochemical-Fenton combined advanced oxidation treatment to decompose macromolecular organic pollutants and improve the BC ratio, and a fourth treatment liquid is obtained;

[0020] ⅵ. Coagulation and sedimentation to remove precipitates

[0021] A reaction alkali is added to the fourth treatment liquid to adjust the treatment liquid to weak alkalinity, and coagulation and sedimentation are performed to obtain precipitates and a fifth treatment liquid;

[0022] Ⅵ. Anaerobic treatment

[0023] The fifth treatment liquid is introduced into an anaerobic reactor from bottom to top to perform anaerobic digestion and degradation, thereby reducing COD, and a sixth treatment liquid flows out of the anaerobic reactor;

[0024] ⅷ. A2O treatment

[0025] The sixth treatment liquid is subjected to A2O treatment to remove nitrogen and phosphorus and further reduce COD and BOD, and a seventh treatment liquid is obtained;

[0026] ⅸ. MBR membrane biological treatment

[0027] The seventh treatment liquid is introduced into a membrane bioreactor to perform membrane biological combined treatment, thereby further reducing COD and BOD, and an eighth treatment liquid is discharged from the membrane bioreactor;

[0028] ⅹ. Discharge after treatment

[0029] Sodium hypochlorite is added to the eighth treatment liquid, and detection is performed again to achieve the urban wastewater comprehensive discharge standard, and the eighth treatment liquid is directly discharged.

[0030] Further, the pre-treatment process in step i includes the following steps:

[0031] First, free oil and large solid particles are separated from the waste emulsion by gravity through standing and precipitation;

[0032] Then, the waste emulsion is filtered through a filter screen, filter bag or filter cartridge to remove solid impurities to obtain a first treated liquid.

[0033] Further, the second treated liquid and the oil phase liquid in step ii are separated by standing / centrifugation.

[0034] Further, the fatty acid separation process in step iv is as follows:

[0035] After the second treated liquid is fully mixed with sulfuric acid, it is sent to a dissolved air flotation tank, air is introduced into the mixed liquid in the form of micro-nano bubbles through a dissolved air flotation device, and the micro-nano bubbles adhere to the fatty acid and float up together, and the non-water-soluble fatty acid is collected and regenerated.

[0036] Further, the reaction acid in step iv is sulfuric acid.

[0037] Further, the combined advanced oxidation treatment in step iv is iron-carbon micro-electrolysis-Fenton.

[0038] Further, the water part of the aerobic tank in step vii is partially returned to the anaerobic reactor in step vi.

[0039] Further, the reaction base in step v is calcium hydroxide or a mixture of calcium hydroxide and aluminum hydroxide.

[0040] The present application can collect and remove oil, ester, fatty acid soap, surfactant, additive, and rust inhibitor in the waste emulsion effectively, so that the final liquid discharge can meet the urban sewage comprehensive discharge standard.

[0041] In the present application, sulfuric acid and calcium hydroxide / aluminum hydroxide are selected, and the resulting calcium sulfate, aluminum sulfate and calcium hydroxide are all precipitates, which will not increase the salt content of water and increase the difficulty of biochemical treatment due to the addition of reagents. At the same time, the addition of acid also provides the best reaction conditions for subsequent electrochemical and Fenton treatment, facilitating the electrochemical and Fenton reaction.

[0042] The present application effectively treats waste emulsion into water that can be discharged up to the standard, and can collect oil, ester and fatty acid in the process for resource utilization. The present application is environmentally friendly and easy to be widely promoted. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a method flow chart of the present application. DETAILED DESCRIPTION

[0044] Hereinafter, the present application is described in detail with reference to examples:

[0045] A renewable treatment method of waste emulsion, comprising the following steps:

[0046] ⅰ. Pretreatment of waste emulsion

[0047] The waste emulsion in the processing production is uniformly recovered, the free oil and large particle solids are separated from the waste emulsion by gravity, and then the fine solid particles in the waste emulsion are removed by using a stainless steel filter, to obtain a first treatment liquid and collect the cuttings.

[0048] Among them, the main components of the first treatment liquid are: water, emulsified oil, ester, fatty acid soap, surfactant, additive, rust inhibitor.

[0049] ⅱ. Demulsification of the obtained solution

[0050] The commercially available demulsifier is added to the obtained first treatment liquid, and stirred for a certain time to demulsify the first treatment liquid, and then the second treatment liquid and oil phase liquid are obtained by standing.

[0051] Among them, the main components of the second treatment liquid are: water, ester, fatty acid soap, surfactant, additive, rust inhibitor.

[0052] In this process, the oil with the highest COD in the treatment liquid is removed.

[0053] ⅲ. Collecting oil phase liquid

[0054] The oil phase liquid and the second treatment liquid are subjected to liquid-liquid separation by standing, and the residual moisture in the oil phase liquid is separated out by using a centrifuge, and the oil phase is collected and regenerated.

[0055] ⅳ. Separation of fatty acid

[0056] The reaction acid is added to the obtained second treatment liquid, the pH value is adjusted to 2-3, the ester and fatty acid soap are hydrolyzed, and the non-water-soluble fatty acid generated by hydrolysis in the second treatment liquid is collected by using a dissolved air flotation device, and a third treatment liquid is obtained.

[0057] Among them, the main components of the third treatment liquid are: water, sulfuric acid, alcohol, surfactant, additive, rust inhibitor.

[0058] In this process, the ester and fatty acid soap with the largest COD proportion in the treatment liquid are removed

[0059] ⅴ. Continue electrochemical-fenton combined advanced oxidation treatment

[0060] The resulting third treated liquid enters the iron-carbon micro-electrolysis reactor for electrochemical treatment and continuous aeration. The floating sludge that floats with the aeration bubbles is removed by a sludge scraper. As the micro-electrolysis reaction proceeds, the pH value gradually increases. When the pH value of the effluent becomes 4-5, it enters the Fenton reactor, where hydrogen peroxide is added and stirred to carry out the Fenton reaction. Through combined advanced oxidation treatment, the difficult-to-biodegrade macromolecular organic pollutants are oxidized and decomposed into biodegradable organic pollutants, resulting in the fourth treated liquid.

[0061] The main components of the fourth treatment solution are: water, a small amount of hydrogen ions, ferrous sulfate, dissolved organic pollutants and insoluble organic pollutants that have been oxidized and decomposed. At this time, the COD of the treatment solution decreases, the BOD increases, and the B / C ratio increases.

[0062] vi. Coagulation and sedimentation to remove precipitates

[0063] A mixture of calcium hydroxide and aluminum hydroxide is added to the fourth treatment liquid to adjust the pH value to 7-9, and calcium sulfate precipitate, iron hydroxide precipitate and aluminum sulfate flocculant are generated. After the reaction, the flocculated precipitate and the fifth treatment liquid are obtained through the inclined tube sedimentation tank. PAM coagulant is added to the flocculated precipitate and it is pressed into a sludge cake by a plate and frame filter press.

[0064] The main components of the fifth treatment solution are water and various dissolved organic pollutants, with a COD value of 5000~10000.

[0065] vii. Anaerobic treatment

[0066] The fifth treatment liquid is fed into the UASB anaerobic reactor from bottom to top for anaerobic biochemical treatment, and the sixth treatment liquid flows out from the UASB reactor.

[0067] Among them, the COD removal rate of the sixth treatment solution reached 70-80%.

[0068] ⅷ. A2O processing

[0069] The sixth treatment solution was subjected to A2O treatment to further reduce COD and BOD while removing phosphorus and nitrogen, resulting in the seventh treatment solution.

[0070] Among them, the COD removal rate of the seventh treatment liquid reaches 70-80%, while the total nitrogen and total phosphorus content is reduced to the standard emission values.

[0071] ⅸ. MBR membrane biological treatment

[0072] The seventh treatment solution is fed into the MBR membrane bioreactor for biochemical membrane treatment to further remove COD, BOD and MLSS in the water, and the eighth treatment solution is discharged from the membrane bioreactor.

[0073] Among them, the COD removal rate of the eighth treatment solution reached 60-70%.

[0074] x. Discharge after treatment

[0075] The eighth treatment solution was tested and found to meet the comprehensive urban sewage discharge standards. After adding sodium hypochlorite for disinfection, the eighth treatment solution was directly discharged.

[0076] The preprocessing in step i includes the following steps:

[0077] First, metal debris in the waste emulsion is adsorbed by a magnetic material, separating the metal debris from the waste emulsion. Then, the free oil and large solid particles are separated by settling.

[0078] Then, the waste emulsion is filtered through a filter screen, filter bag, or filter cartridge to remove solid impurities of 10-1000 microns, resulting in the first treated liquid.

[0079] In step ii, the second processing liquid and the oil phase liquid are separated by settling or centrifugation.

[0080] The fatty acid separation process in step iv is as follows:

[0081] First, the second treatment liquid that has completely reacted with the acid and air are added to the dissolved air tank and pressurized to ensure that the air has been well dissolved in the wastewater;

[0082] Then, the mixture is fed into the flotation tank. When the air is suddenly depressurized, many tiny bubbles will appear. The bubbles float up with the fatty acids, and the fatty acids are collected.

[0083] The acid used in step iv is sulfuric acid.

[0084] The anaerobic reactor can also be an IC anaerobic reactor.

[0085] The pressurized dissolved air flotation device can also be a dissolved air pump type flotation device.

[0086] The pH of the third treatment solution after adding sulfuric acid is 2-3, which is exactly the optimal pH value required for iron-carbon micro-electrolysis. The pH of the treatment solution after the iron-carbon micro-electrolysis reaction is 4-5, which is exactly the optimal pH value required for the Fenton reaction.

[0087] Even better, the sulfate ions added in step iv and the ferrous ions dissolved in water by the iron-carbon micro-electrolysis reaction to form ferrous sulfate are exactly the raw materials required for the Fenton reaction.

[0088] Furthermore, calcium hydroxide or a mixture of calcium hydroxide and aluminum hydroxide is used during coagulation and sedimentation to neutralize excess hydrogen ions in the water, adjust the pH value, and form calcium sulfate precipitate, thereby reducing the salt content of the treated liquid. The generated ferric hydroxide and aluminum sulfate act as flocculants, eliminating the need to add flocculants.

[0089] Example 1

[0090] A method for the regenerative treatment of waste emulsion includes the following steps:

[0091] i. Pretreatment of waste emulsion

[0092] Waste emulsions from processing are collected uniformly. First, the emulsions are allowed to settle and free oil and large solid particles are separated from them by gravity. Then, a stainless steel filter with a filtration accuracy of 10-1000 microns is used to separate the solids and liquids of the waste emulsions to obtain the first treated liquid, and the chips are collected.

[0093] The main components of the first treatment solution are: water, emulsified oil, ester, fatty acid soap, surfactant, additives, and rust inhibitor.

[0094] ii. Demulsify the resulting solution.

[0095] A commercially available demulsifier was added to the first treated liquid, and the mixture was stirred at 20℃-60℃ for 10-30 minutes to demulsify the first treated liquid. The mixture was then allowed to stand to obtain the second treated liquid and the oil phase liquid.

[0096] The main components of the second treatment liquid are: water, ester, fatty acid soap, surfactant, additives, and rust inhibitor.

[0097] iii. Collect the oil phase liquid

[0098] The oil phase liquid and the second treatment liquid are allowed to stand for 6 to 12 hours for liquid-liquid separation. The residual water in the oil phase liquid is then separated by a centrifuge at a speed of 6000 to 17000. The oil phase is then collected in a unified manner.

[0099] iv. Separation of fatty acids

[0100] Reactive sulfuric acid was added to the obtained second treatment solution to adjust its pH value to 2-3, and the oil esters and fatty acid soaps were hydrolyzed. The non-water-soluble fatty acids generated by hydrolysis in the second treatment solution were collected by a dissolved air flotation device, and a third treatment solution was obtained at the same time.

[0101] The main components of the third treatment solution are: water, sulfuric acid, alcohol, surfactant, additives, and rust inhibitor.

[0102] v. Continue with electrochemical-Fenton combined advanced oxidation treatment

[0103] The resulting third treated liquid enters the micro-electrolysis reaction tank for electrochemical treatment and continuous aeration. The scum that floats with the aeration bubbles is removed by a scraper. As the micro-electrolysis reaction proceeds, the pH value gradually increases. When the pH value of the effluent becomes 4-5, it enters the Fenton reaction tank, where hydrogen peroxide is added and stirred to carry out the Fenton reaction. Through combined advanced oxidation treatment, the difficult-to-biodegrade macromolecular organic pollutants are oxidized and decomposed into biodegradable organic pollutants. When the pH value becomes 6, it is discharged to obtain the fourth treated liquid.

[0104] The main components of the fourth treatment solution are: water, a small amount of hydrogen ions, ferrous sulfate, dissolved organic pollutants and insoluble organic pollutants that have been oxidized and decomposed. At this time, the COD of the treatment solution decreases, the BOD increases, and the B / C ratio increases.

[0105] vi. Coagulation and sedimentation to remove precipitates

[0106] A mixture of calcium hydroxide and aluminum hydroxide is added to the fourth treatment liquid to adjust the pH value to 7-9, and calcium sulfate precipitate, iron hydroxide precipitate and aluminum sulfate flocculant are generated. After the reaction, the flocculated precipitate and the fifth treatment liquid are obtained through the inclined tube sedimentation tank. PAM coagulant is added to the flocculated precipitate and it is pressed into a sludge cake by a plate and frame filter press.

[0107] The main components of the fifth treatment solution are water and various dissolved organic pollutants, with a COD value of 5000~10000.

[0108] vii. Anaerobic treatment

[0109] The fifth treatment liquid is fed into the UASB anaerobic reactor from bottom to top for anaerobic biological treatment, with a hydraulic retention time of 48 hours. The sixth treatment liquid flows out from the UASB reactor.

[0110] Among them, the COD removal rate of the fifth and sixth treatment solutions reached 70-80%.

[0111] ⅷ. A2O processing

[0112] The sixth treatment solution was subjected to A2O treatment to further reduce COD and BOD while removing phosphorus and nitrogen. The hydraulic retention time was 3-4 hours in the anaerobic stage, 4-6 hours in the anoxic stage, and 9-12 hours in the aerobic stage to obtain the seventh treatment solution.

[0113] Among them, the COD removal rate of the seventh treatment liquid reaches 70-80%, while the total nitrogen and total phosphorus content is reduced to the standard emission values.

[0114] ⅸ. MBR membrane biological treatment

[0115] The seventh treatment solution is fed into the MBR membrane bioreactor for biochemical membrane treatment to further remove COD, BOD and MLSS in the water. The hydraulic retention time is 3 to 5 hours. The eighth treatment solution is discharged from the membrane bioreactor.

[0116] Among them, the COD removal rate of the eighth treatment solution reached 60-70%.

[0117] x. Discharge after treatment

[0118] The eighth treatment solution was tested and found to meet the comprehensive urban sewage discharge standards. After adding sodium hypochlorite for disinfection, the eighth treatment solution was directly discharged.

[0119] The preprocessing in step i includes the following steps:

[0120] First, metal debris in the waste emulsion is adsorbed by a magnetic material, and the metal debris is separated from the waste emulsion by standing and settling to separate free oil and large solid particles.

[0121] Then, the waste emulsion is filtered through a filter screen, filter bag, or filter cartridge to remove solid impurities of 10-1000 microns, resulting in the first treated liquid.

[0122] This invention is also applicable to the regenerative treatment of waste fully emulsified and semi-synthetic cutting fluids.

[0123] This invention can effectively collect or remove mineral oil, esters, fatty acid soaps, surfactants, additives, and rust inhibitors from waste emulsions, thereby enabling the final treated liquid discharge to meet the comprehensive urban sewage discharge standards. This invention comprehensively improves the entire emulsion treatment process, fully recovers usable resources, and makes emulsion treatment more stable and feasible.

[0124] In this invention, the addition of sulfuric acid and calcium hydroxide / aluminum hydroxide does not increase the difficulty of processing due to the addition of substances. At the same time, the addition of acid provides the best reaction conditions for subsequent electrochemical treatment, which facilitates the electrochemical treatment process.

[0125] This invention effectively treats waste emulsification into dischargeable water and enables the resource collection of oil, esters, and fatty acids generated during the process. This invention is environmentally friendly and easy to promote widely.

Claims

1. A method for the regenerative treatment of waste emulsion, characterized in that: Includes the following steps: (i) Pretreatment of waste emulsion Waste emulsions from processing are collected in a unified manner, and solid-liquid separation is performed on the waste emulsions to obtain the first treated liquid, while chips and sludge are collected. The main components of the first treatment solution are: water, emulsified oil, ester, fatty acid soap, surfactant, additives, and rust inhibitor; (ii) Demulsify the resulting solution Add a demulsifier to the obtained first processed liquid to demulsify the first processed liquid, and obtain a second processed liquid and an oil phase liquid; The main components of the second treatment solution are: water, ester, fatty acid soap, surfactant, additives, and rust inhibitor; During this process, the oil with the highest COD in the treatment solution was removed; (iii) Collect the oil phase liquid The oil phase liquid and the second treatment liquid are separated into liquid and liquid phases, and the oil phase liquid is collected and regenerated. (iv) Separation of fatty acids A reactive acid is added to the obtained second treatment solution to hydrolyze the ester and fatty acid soap to generate insoluble fatty acids, alcohols, alcohol amines, and salts, decompose high molecular weight organic matter, and collect the insoluble fatty acids in the second treatment solution to obtain the third treatment solution. The main components of the third treatment solution are: water, sulfuric acid, alcohol, surfactant, additives, and rust inhibitor; (v) Continue electrochemical-Fenton combined advanced oxidation treatment The obtained third treatment solution was subjected to electrochemical-Fenton combined advanced oxidation treatment to decompose macromolecular organic pollutants, increase the BC ratio, and obtain the fourth treatment solution. The main components of the fourth treatment solution are: water, a small amount of hydrogen ions, ferrous sulfate, dissolved organic pollutants and insoluble organic pollutants that have been oxidized and decomposed. At this time, the COD of the treatment solution decreases, the BOD increases, and the B / C ratio increases. (vi) Coagulation and sedimentation to remove precipitates Add a reaction base to the fourth treatment solution to adjust the solution to a weakly alkaline state, then coagulate and precipitate to obtain the precipitate and the fifth treatment solution; The main components of the fifth treatment solution are: water and various dissolved organic pollutants, with a COD value of 5000~10000; (vii) Anaerobic treatment The fifth treatment liquid is fed into the anaerobic reactor from bottom to top for anaerobic digestion and degradation to reduce COD, and the sixth treatment liquid flows out from the anaerobic reactor. The COD removal rate of the sixth treatment solution reaches 70-80%; (ⅷ) A2O treatment The sixth treatment solution was subjected to A2O treatment to further reduce COD and BOD while removing nitrogen and phosphorus, resulting in the seventh treatment solution. The COD removal rate of the seventh treatment liquid reaches 70-80%, while the total nitrogen and total phosphorus content is reduced to the standard emission values; (x) MBR membrane biological treatment The seventh treatment solution is fed into a membrane bioreactor for combined membrane and biological treatment to further reduce COD and BOD, while the eighth treatment solution is discharged from the membrane bioreactor. (x) Discharge after treatment Sodium hypochlorite was added to the eighth treatment solution, and then the solution was tested. If it met the comprehensive sewage discharge standards of the town, the eighth treatment solution was directly discharged.

2. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: The preprocessing in step (i) includes the following steps: First, by allowing the mixture to settle, free oil and large solid particles are separated from the waste emulsion by gravity. Then, the waste emulsion is filtered through a filter screen, filter bag, or filter cartridge to remove solid impurities and obtain the first treated liquid.

3. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: The second treatment liquid and the oil phase liquid in step (ii) are separated by settling / centrifugation.

4. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: The fatty acid separation process in step (iv) is as follows: After the second treatment liquid and the reacting acid are fully mixed and reacted, they are sent into the dissolved air flotation tank. Air is introduced into the mixture in the form of micro-nano bubbles through the dissolved air flotation device. The micro-nano bubbles adhere to the non-water-soluble fatty acids and float up together, so that the non-water-soluble fatty acids are collected.

5. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: The acid used in step (iv) is sulfuric acid.

6. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: In step (v), the combined advanced oxidation treatment is an electrochemical-Fenton combined advanced oxidation, wherein the electrochemical treatment is iron-carbon microelectrolysis.

7. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: In step (ⅷ), part of the water from the aerobic tank is returned to the anaerobic reactor in step (ⅶ).

8. The method for regenerable treatment of waste emulsion according to claim 1, characterized in that: The reaction base in step (vi) is calcium hydroxide or a mixture of calcium hydroxide and aluminum hydroxide.

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