CN114477327B - Method for removing oil sludge in coal chemical industry wastewater - Google Patents
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- CN114477327B CN114477327B CN202210103267.8A CN202210103267A CN114477327B CN 114477327 B CN114477327 B CN 114477327B CN 202210103267 A CN202210103267 A CN 202210103267A CN 114477327 B CN114477327 B CN 114477327B
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
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- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
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- B01D17/048—Breaking emulsions by changing the state of aggregation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
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- 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
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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
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Abstract
The invention discloses a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps: adding a demulsification material LY-01 into the coal chemical wastewater to be treated, and stirring to obtain an intermediate mixed system; adding a coalescing material LY-02 into the intermediate mixed system, stirring, standing and separating to obtain wastewater after oil sludge treatment; the demulsification material LY-01 is prepared from quaternary ammonium salt cationic monomers, lipophilic and hydrophobic monomers and polyalcohol amine; the coalescing material LY-02 is prepared from gelatin, magnetic powder material, citric acid and demulsification material LY-01; according to the invention, demulsification material LY-01 and coalescing material LY-02 are added into the coal chemical wastewater to be treated, and the surfaces of the demulsification material LY-01 and the coalescing material LY-02 are provided with rich positive charges and branched structures, so that the negatively charged colloid substance particles in the wastewater are destabilized, and the aggregates with smaller volumes are coalesced by utilizing the coalescing performance of the coalescing material LY-02, so that the separation and removal of the oil sludge are finally realized.
Description
Technical Field
The invention belongs to the technical field of pretreatment of wastewater in coal chemical industry, and particularly relates to a method for removing oil sludge in wastewater in coal chemical industry.
Background
The effluent of the coal chemical wastewater has large water yield and complex water quality, and is difficult-to-treat chemical wastewater; wherein about 0.8-1.1 ton of wastewater is generated by converting 1 ton of coal, and the wastewater has large water yield and contains a large amount of toxic and harmful substances such as solid suspended particles, oil, phenol, ammonia nitrogen and the like; if the pretreatment process of the coal chemical wastewater has poor removal effect on the oil sludge, the recovery difficulty of phenol and ammonia can be increased, and the recovery efficiency of the phenol and ammonia can be reduced; moreover, the subsequent recovery process is blocked, and the biochemical tank is difficult to normally operate; therefore, the removal of the oil sludge in the pretreatment of the wastewater in the coal chemical industry is particularly important
At present, the method for removing the oil sludge in the coal chemical wastewater mainly comprises a gravity sedimentation method, a membrane filtration method, a chemical coagulation treatment method and the like; fine solid suspended colloid particles (such as coal ash and the like) with the particle size distribution of 4-200um are difficult to remove by gravity sedimentation and other methods in the wastewater; therefore, the existing removal method cannot well remove the oil sludge in the coal chemical wastewater; if a chemical coagulation treatment method or a membrane filtration method is adopted, the defects of large dosage of the medicament, serious membrane pollution and the like exist; meanwhile, the problems of high sludge yield, difficult treatment and the like exist; in the existing coal chemical wastewater treatment process, technologies such as filtration and the like are mostly adopted to synchronously filter tar and solid wastes in wastewater, so that the method is not suitable for the coal chemical wastewater with high pollutant concentration and high oil content, and the process for effectively recycling the oil sludge is not found.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for removing the oil sludge in the coal chemical wastewater, which aims at solving the technical problems that the oil sludge cannot be effectively removed in the existing oil sludge removing process and the dosage of the medicament is large.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, adding a demulsification material LY-01 into coal chemical wastewater to be treated, and stirring to obtain an intermediate mixed system;
step 2, adding a coalescing material LY-02 into the intermediate mixing system, stirring, standing and separating to obtain wastewater after oil sludge treatment;
the demulsification material LY-01 is used for demulsification treatment of the oil sludge matters in the wastewater of the coal chemical industry to be treated so as to enable the oil sludge matters to be aggregated to form aggregates with smaller volume; wherein the demulsification material LY-01 is prepared from quaternary ammonium salt cationic monomers, lipophilic hydrophobic monomers and polyalcohol amine;
the coalescing material LY-02 is used for coalescing the aggregates with smaller volumes to form aggregates with larger volumes; wherein the coalescing material LY-02 is prepared from gelatin, magnetic powder material, citric acid and demulsification material LY-01.
Further, the volume ratio of the coal chemical wastewater to be treated, the demulsification material LY-01 and the coalescence material LY-02 is (800-1000): (10-20): (1-5).
Further, the preparation process of the demulsification material LY-01 specifically comprises the following steps:
mixing quaternary ammonium salt cationic monomer, oleophylic and hydrophobic monomer and polyalcohol amine to prepare mixed solution;
adding an introducing agent into the mixed solution to perform polymerization reaction to obtain a polymerization reaction product;
adding a cross-linking agent into the polymerization reaction product to carry out cross-linking polymerization reaction to obtain a cross-linking polymerization product;
and (3) separating and purifying the crosslinked polymer product to obtain the demulsification material LY-01.
Further, the preparation process of the coalescing material LY-02 comprises the following steps:
dissolving gelatin in water to obtain gelatin solution; adding magnetic powder material and citric acid into the gelatin solution, and stirring by ultrasonic to obtain magnetic colloid;
adding the demulsification material LY-01 into the magnetic colloid, and stirring to obtain a black solution;
and carrying out magnetic adsorption separation on the black solution to obtain a separation product, washing the separation product, and carrying out cold drying grinding to obtain powder to obtain the coalescing material LY-02.
Further, in the step 1, the stirring time is 6-10min, and the stirring speed is 400-700 r/min.
Further, in the step 2, the stirring time is 15-30min, and the stirring speed is 100-400 r/min.
In the step 2, the mixture is kept stand for 1 to 2 hours under the environment of a magnetic field.
Further, the removal rate of the oil sludge substances in the wastewater after the oil sludge treatment is 97.5% -98.8%, the removal rate of the oil is 48.3% -49.8%, and the removal rate of COD is 36.1% -39.2%.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the steps of adding a demulsification material LY-01 and a coalescing material LY-02 into the coal chemical industry wastewater to be treated, wherein the surfaces of the demulsification material LY-01 and the coalescing material LY-02 are provided with rich positive charges and branched structures, destabilizing colloid substance particles with negative charges in the wastewater, and coalescing aggregates with smaller volumes by utilizing the coalescing performance of the coalescing material LY-02 to form agglomerates with larger volumes; demulsification and coalescence of oil sludge substances in the coal chemical wastewater are carried out through the synergistic effect of the demulsification material LY-01 and the coalescence material LY-02, and finally separation and removal of the oil sludge are realized; meanwhile, the method is beneficial to removing the oil sludge in the coal chemical wastewater, reduces the sludge yield, enhances the mud-water separation effect, reduces the water content of the oil sludge, improves the overall effluent quality, and realizes the efficient treatment of the oil sludge in the coal chemical wastewater; the removal rate of the oil sludge substances in the wastewater treated by the oil sludge is 97.5-98.8%, the removal rate of the oil is 48.3-49.8%, and the removal rate of COD is 36.1-39.2%; the wastewater pretreated by the oil sludge can obviously improve the subsequent phenol-ammonia recovery efficiency, reduce the biochemical treatment difficulty and obviously increase the economic benefit.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the following specific embodiments are used for further describing the invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention relates to a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, adding a demulsification material LY-01 into coal chemical wastewater to be treated, and stirring for 6-10min under the condition that the stirring rate is 400-700 r/min to obtain an intermediate mixed system;
step 2, adding a coalescing material LY-02 into the intermediate mixing system, and stirring for 15-30min under the condition that the stirring rate is 100r/min-400 r/min; and standing and precipitating under the magnetic field environment condition, and separating to obtain wastewater after the oil sludge treatment.
In the invention, the demulsification material LY-01 is used for demulsification treatment of the oil sludge matters in the wastewater of the coal chemical industry to be treated so as to enable the oil sludge matters to be aggregated to form aggregates with smaller volume; wherein the demulsification material LY-01 is prepared from quaternary ammonium salt cationic monomers, lipophilic hydrophobic monomers and polyalcohol amine; the preparation process comprises the following steps:
s1, mixing a quaternary ammonium salt cationic monomer, an oleophilic hydrophobic monomer and a polyalcohol amine to prepare a mixed solution; wherein the quaternary ammonium salt cationic monomer is one of dimethyl diallyl ammonium chloride, methacryloxyethyl trimethyl ammonium chloride and methacrylamide alkyl ammonium chloride; the oleophylic and hydrophobic monomer is one of lauryl methacrylate, isodecyl methacrylate and butyl methacrylate; the polymeric alcohol amine is polytriethanolamine.
S2, adding an introducing agent into the mixed solution to perform polymerization reaction to obtain a polymerization reaction product; wherein the initiator adopts one of ammonium persulfate, potassium persulfate and hydrogen peroxide.
S3, adding a cross-linking agent into the polymerization reaction product to carry out cross-linking polymerization reaction to obtain a cross-linking polymerization product; wherein, the cross-linking agent adopts one of ethylenediamine, n-butylamine and polyethylene polyamine.
S4, separating and purifying the crosslinked polymer product to obtain the demulsification material LY-01.
In the invention, the coalescing material LY-02 is used for coalescing the aggregates with smaller volumes to form aggregates with larger volumes; wherein the coalescing material LY-02 is prepared from gelatin, magnetic powder material, citric acid and demulsification material LY-01, and the preparation process is as follows:
step 01, dissolving gelatin in water to obtain gelatin solution; adding magnetic powder material and citric acid into the gelatin solution, and stirring by ultrasonic to obtain magnetic colloid; wherein the magnetic powder material is one of iron oxide magnetic powder, chromium dioxide magnetic powder and metal magnetic powder.
And 02, adding the demulsification material LY-01 into the magnetic colloid, and stirring to obtain a black solution.
And 03, magnetically adsorbing and separating the black solution to obtain a separated product, washing the separated product, and performing cold drying grinding to obtain powder to obtain the coalescing material LY-02.
In the invention, the volume ratio of the coal chemical wastewater to be treated, the demulsification material LY-01 and the coalescence material LY-02 is (800-1000): (10-20): (1-5); the removal rate of the oil sludge substances in the wastewater after the oil sludge treatment is 97.5% -98.8%, the removal rate of the oil reaches 48.3% -49.8%, and the removal rate of COD reaches 36.1% -39.2%.
According to the method for removing the oil sludge in the coal chemical industry wastewater, the demulsification material LY-01 is prepared from quaternary ammonium salt cationic monomers, lipophilic and hydrophobic monomers and polyalcohol amine; the demulsification material LY-01 is a high molecular compound, carries a large number of positive charge groups, has unique oleophilic and hydrophobic properties, and has a rich chain structure on the surface; the method has the advantages that the negative charges on the surfaces of colloid particles of the oil sludge substances can be efficiently neutralized, the stability of the oil sludge substances is damaged, and the oil sludge substances are quickly adsorbed on an oil-water interface through the interaction force among molecules, so that O/W emulsion is damaged, surfactant and asphaltene molecules are replaced, the interfacial tension of oil water and the interfacial film strength are reduced, the quick generation of the agglomeration effect among the oil sludge substance particles is promoted, and the agglomeration effect among small oil sludge particles is enhanced; the coalescing material LY-02 is obtained by modifying the demulsification material LY-01 by using a magnetic material in a magnetic colloid, is used as a macromolecular surfactant with excellent performance, has a rich branched chain structure and specific functional groups, can coalesce oil sludge particles dispersed in water, and has a very strong promotion effect on the rapid separation of an oil phase, a water phase and a mud phase in coal chemical wastewater.
According to the invention, demulsification material LY-01 and coalescing material LY-02 are added into wastewater to be treated, the surfaces of the demulsification material LY-01 and the coalescing material LY-02 are provided with rich positive charges and branched structures, so that colloid substance particles with negative charges in the wastewater are destabilized, and aggregates with smaller volume are coalesced by utilizing the coalescing performance of the coalescing material LY-02, so that a coalescent with larger volume is formed; demulsification and coalescence of oil sludge substances in the coal chemical wastewater are carried out through the synergistic effect of the demulsification material LY-01 and the coalescence material LY-02, and finally separation and removal of the oil sludge are realized; the method is more beneficial to removing the oil sludge in the coal chemical wastewater, reduces the sludge yield, enhances the mud-water separation effect, reduces the water content of the oil sludge, improves the overall effluent quality, and realizes the efficient treatment of the oil sludge in the coal chemical wastewater.
Example 1
The embodiment 1 provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, taking coal chemical wastewater to be treated, demulsification material LY-01 and coalescence material LY-02 according to the volume ratio of 1000:20:1.
And 2, adding a demulsification material LY-01 into the coal chemical wastewater to be treated, and stirring for 10min under the condition of the stirring rate of 700r/min so as to basically destabilize colloid in the coal chemical wastewater to be treated, and aggregating part of oil sludge to form aggregates with smaller volume, thereby obtaining an intermediate mixed system.
Step 3, adding an addition polymerization material LY-02 into the intermediate mixing system, and stirring for 30min under the condition that the stirring rate is 100r/min so as to agglomerate the oily sludge matters in the wastewater into agglomerates with larger volume; and standing for 2 hours under the magnetic field environment condition, further agglomerating the oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
Example 2
The embodiment 2 provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, taking coal chemical wastewater to be treated, demulsification material LY-01 and coalescence material LY-02 according to the volume ratio of 1000:10:1.
And 2, adding a demulsification material LY-01 into the coal chemical wastewater to be treated, and stirring for 6min under the condition of the stirring rate of 600r/min so as to basically destabilize colloid in the coal chemical wastewater to be treated, and aggregating part of oil sludge to form aggregates with smaller volume, thereby obtaining an intermediate mixed system.
Step 3, adding an addition polymerization material LY-02 into the intermediate mixing system, and stirring for 25min under the condition that the stirring rate is 200r/min so as to agglomerate the oily sludge matters in the wastewater into agglomerates with larger volume; and standing for 2 hours under the magnetic field environment condition, further agglomerating the oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
Example 3
The embodiment 3 provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, taking coal chemical wastewater to be treated, demulsification material LY-01 and coalescence material LY-02 according to the volume ratio of 800:20:1.
And 2, adding a demulsification material LY-01 into the coal chemical wastewater to be treated, and stirring for 8min under the condition of a stirring rate of 500r/min so as to basically destabilize colloid in the coal chemical wastewater to be treated, and aggregating part of oil sludge to form aggregates with smaller volume, thereby obtaining an intermediate mixed system.
Step 3, adding an addition polymerization material LY-02 into the intermediate mixing system, and stirring for 20min under the condition of the stirring rate of 300r/min so as to agglomerate the oily sludge matters in the wastewater into agglomerates with larger volume; and standing for 2 hours under the magnetic field environment condition, further agglomerating the oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
Example 4
The embodiment 1 provides a method for removing oil sludge in coal chemical industry wastewater, which comprises the following steps:
step 1, taking coal chemical wastewater to be treated, demulsification material LY-01 and coalescence material LY-02 according to the volume ratio of 800:10:1.
And 2, adding a demulsification material LY-01 into the coal chemical wastewater to be treated, and stirring for 10min under the condition of a stirring rate of 400r/min so as to basically destabilize colloid in the coal chemical wastewater to be treated, and aggregating part of oil sludge to form aggregates with smaller volume, thereby obtaining an intermediate mixed system.
Step 3, adding an addition polymerization material LY-02 into the intermediate mixing system, and stirring for 15min under the condition that the stirring rate is 400r/min so as to agglomerate the oily sludge matters in the wastewater into agglomerates with larger volume; and standing for 2 hours under the magnetic field environment condition, further agglomerating the oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
Test results:
in the invention, the sludge removal effect of the removal method is detected by adopting the wastewater of a certain coal chemical plant. The oil content in the wastewater of the coal chemical plant is 2000mg/L, the volatile phenol content is 8000mg/L, the ammonia nitrogen content is 6000mg/L, the COD content is 60000mg/L, the SS content is 2000mg/L, and the method specifically comprises the following steps: according to the operation method and the addition conditions determined in the above examples 1-4, the method is used for the actual coal chemical wastewater, and after the reaction is finished, various parameters of clear water outlet are measured to reflect the implementation effect of the specific examples; the detection results of the indexes in the above examples are shown in table 1.
Table 1 removal rates of various indexes of wastewater from coal chemical industry treated in examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Oil removal Rate (%) | 48.3 | 49.2 | 49.8 | 48.6 |
| Removal rate of SS (%) | 97.5 | 98.3 | 98.8 | 97.9 |
| Removal rate of COD (%) | 36.5 | 38.3 | 39.2 | 36.1 |
From table 1, it can be seen that the method of the invention is used for removing the oil sludge in the coal chemical industry wastewater, has high removal efficiency of the oil sludge and stable effect, and has important guiding significance for the continuous and healthy development of the coal chemical industry in the future.
According to the invention, the demulsification material LY-01 and the coalescing material LY-02 are utilized to effectively remove the oil sludge in the coal chemical wastewater; the method not only avoids the problem of excessively high water treatment cost due to the addition of a large amount of coagulant, but also can realize the efficient coalescence and separation of the oil sludge, and meanwhile, the polymer coalescence material has the characteristics of less addition, less pollution, low cost, good effect, easy separation of the produced oil sludge and the like; not only reduces the pollution to the environment, but also can realize the high-efficiency separation of the oil sludge substances in the coal chemical wastewater in a low-cost mode.
According to the method for removing the oil sludge in the coal chemical wastewater, the demulsification material LY-01 and the coalescing material LY-02 are added into the coal chemical wastewater to be treated, and the demulsification material LY-01 and the coalescing material LY-02 are both polymer coalescing materials, so that the polymer coalescing materials have rich branched structures and specific adsorption functional groups, have the characteristics of high activity, strong demulsification capacity and the like, can effectively adsorb oil substances in the coalescent and net-captured wastewater by utilizing the rich functional group structures on the surfaces of the polymeric materials, achieve the purpose of condensation and separation, and can effectively remove substances such as coal ash in the wastewater, thereby avoiding congestion caused by a subsequent process.
In the invention, the separation and removal of the oil sludge in the coal chemical industry are key to realizing the harmless treatment of the wastewater in the coal chemical industry and the sustainable development of the coal chemical industry; the pretreatment process not only can remove oil substances, phenolic substances and ammonia nitrogen in a targeted manner, but also can realize recycling of substances and create good biochemical conditions for microorganisms in a biochemical pond; the method is characterized in that oil sludge is removed, and simultaneously, oil, polycyclic aromatic hydrocarbon and other substances in the wastewater are fixed in the oil sludge and are separated and removed, so that the separation of the oil sludge and the removal of part of toxic substances are realized.
The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present invention, and the scope of the claimed invention is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present invention.
Claims (5)
1. The method for removing the oil sludge in the coal chemical wastewater is characterized by comprising the following steps of:
step 1, adding a demulsification material LY-01 into coal chemical wastewater to be treated, and stirring to obtain an intermediate mixed system;
step 2, adding a coalescing material LY-02 into the intermediate mixing system, stirring, standing and separating to obtain wastewater after oil sludge treatment;
the demulsification material LY-01 is used for demulsification treatment of the oil sludge matters in the wastewater of the coal chemical industry to be treated so as to enable the oil sludge matters to be aggregated to form aggregates with smaller volume; wherein the demulsification material LY-01 is prepared from quaternary ammonium salt cationic monomers, lipophilic hydrophobic monomers and polyalcohol amine;
the coalescing material LY-02 is used for coalescing the aggregates with smaller volumes to form aggregates with larger volumes; wherein the coalescing material LY-02 is prepared from gelatin, magnetic powder material, citric acid and demulsification material LY-01;
the volume ratio of the coal chemical wastewater to be treated to the demulsification material LY-01 to the coalescence material LY-02 is (800-1000): (10-20): (1-5);
the preparation process of the demulsification material LY-01 specifically comprises the following steps:
mixing quaternary ammonium salt cationic monomer, oleophylic and hydrophobic monomer and polyalcohol amine to prepare mixed solution;
adding an initiator into the mixed solution to perform polymerization reaction to obtain a polymerization reaction product;
adding a cross-linking agent into the polymerization reaction product to carry out cross-linking polymerization reaction to obtain a cross-linking polymerization product;
separating and purifying the crosslinked polymerization product to obtain the demulsification material LY-01;
the preparation process of the coalescing material LY-02 comprises the following steps:
dissolving gelatin in water to obtain gelatin solution; adding magnetic powder material and citric acid into the gelatin solution, and stirring by ultrasonic to obtain magnetic colloid;
adding the demulsification material LY-01 into the magnetic colloid, and stirring to obtain a black solution;
performing magnetic adsorption separation on the black solution to obtain a separation product, washing the separation product, and performing cold drying grinding to obtain powder to obtain the coalescing material LY-02;
the quaternary ammonium salt cationic monomer is one of dimethyl diallyl ammonium chloride, methacryloxyethyl trimethyl ammonium chloride or methacrylamide alkyl ammonium chloride; the oleophylic and hydrophobic monomer is one of lauryl methacrylate, isodecyl methacrylate or butyl methacrylate; the polymeric alcohol amine is polytriethanolamine.
2. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein in the step 1, the stirring time is 6-10min, and the stirring speed is 400-700 r/min.
3. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein in the step 2, the stirring time is 15-30min, and the stirring speed is 100-400 r/min.
4. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein in the step 2, the wastewater after the oil sludge removal is obtained after the oil sludge substances are further coalesced and separated by standing for 1-2 hours under the magnetic field environment condition.
5. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein the removal rate of suspended solids in the wastewater after the oil sludge treatment is 97.5% -98.8%, the removal rate of oil is 48.3% -49.8%, and the removal rate of COD is 36.1% -39.2%.
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