CN114477327A - Method for removing oil sludge in coal chemical industry wastewater - Google Patents
Method for removing oil sludge in coal chemical industry wastewater Download PDFInfo
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- CN114477327A CN114477327A CN202210103267.8A CN202210103267A CN114477327A CN 114477327 A CN114477327 A CN 114477327A CN 202210103267 A CN202210103267 A CN 202210103267A CN 114477327 A CN114477327 A CN 114477327A
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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
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/047—Breaking emulsions with separation aids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/048—Breaking emulsions by changing the state of aggregation
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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
- C02F1/52—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
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- 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
- C02F2001/007—Processes including a sedimentation step
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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
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
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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 demulsifying material LY-01 into the coal chemical wastewater to be treated, and stirring to obtain an intermediate mixed system; adding a coalescence 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 a quaternary ammonium salt cationic monomer, an oleophylic hydrophobic monomer and polyalcohol amine; the coalescence material LY-02 is prepared from gelatin, a magnetic powder material, citric acid and a demulsification material LY-01; according to the invention, the demulsifying material LY-01 and the coalescing material LY-02 are added into the coal chemical industry wastewater to be treated, the surfaces of the demulsifying material LY-01 and the coalescing material LY-02 are provided with abundant positive charges and branched structures, so that colloid substance particles with negative charges in the wastewater are destabilized, aggregates with smaller volume are coalesced by utilizing the coalescing performance of the coalescing material LY-02, and finally, the separation and removal of oil sludge are realized.
Description
Technical Field
The invention belongs to the technical field of pretreatment of coal chemical industry wastewater, and particularly relates to a method for removing oil sludge in coal chemical industry wastewater.
Background
The coal chemical wastewater has large effluent amount and complex water quality, and is chemical wastewater which is difficult to treat; wherein, about 0.8 to 1.1 ton of wastewater is generated by conversion of every 1 ton of coal, and the wastewater not only has large water yield, but also 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 a poor oil sludge removal effect, the phenol ammonia recovery difficulty is increased, and the recovery efficiency is reduced; furthermore, the subsequent recovery process is blocked and the biochemical pool is difficult to operate normally; therefore, the removal of the oil sludge in the pretreatment of the coal chemical wastewater is very important
At present, the methods for removing the oil sludge in the coal chemical industry wastewater mainly comprise a gravity settling method, a membrane filtration method, a chemical coagulation treatment method and the like; because fine solid suspended colloidal particles (such as coal ash and the like) with the particle size distribution of 4-200um exist in the wastewater, the fine solid suspended colloidal particles are difficult to remove by methods such as gravity settling and the like; therefore, the existing removal method cannot well remove the oil sludge in the coal chemical industry wastewater; if a chemical coagulation treatment method or a membrane filtration method is adopted, the defects of large medicament dosage, serious membrane pollution and the like exist; meanwhile, the problems of large sludge yield, difficult treatment and the like exist; in the existing coal chemical industry wastewater treatment process, technologies such as filtering and the like are mostly adopted to synchronously filter tar and solid wastes in wastewater, so that the process is not suitable for coal chemical industry wastewater with high pollutant concentration and large oil content, and a process for effectively recovering oil sludge is not available.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for removing oil sludge in coal chemical industry wastewater, which aims to solve the technical problems that the existing oil sludge removal process cannot effectively remove oil sludge and the using amount of a medicament is large.
In order to achieve the purpose, the invention adopts the technical scheme that:
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 coalescence 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 used for performing demulsification treatment on oil sludge substances in the coal chemical industry wastewater to be treated so as to enable the oil sludge substances to be aggregated to form aggregates with smaller volume; the demulsification material LY-01 is prepared from a quaternary ammonium salt cationic monomer, an oleophylic hydrophobic monomer and polyalcohol amine;
the coalescing material LY-02 for coalescing the smaller volume of aggregates to form a larger volume of coalesced bodies; wherein the coalescence material LY-02 is prepared from gelatin, a magnetic powder material, citric acid and a 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- & gt 1000-): (10-20): (1-5).
Further, the preparation process of the demulsifying material LY-01 comprises the following specific steps:
mixing quaternary ammonium salt cationic monomer, oleophilic hydrophobic monomer and polyalcohol amine to prepare a mixed solution;
adding an introducing agent into the mixed solution to carry out 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-linked polymerization product;
and separating and purifying the crosslinked polymerization product to obtain the demulsification material LY-01.
Further, the preparation process of the coalescence material LY-02 is as follows:
dissolving gelatin in water to obtain a gelatin solution; adding a magnetic powder material and citric acid into the gelatin solution, and performing ultrasonic stirring to obtain a magnetic colloid;
adding the demulsifying material LY-01 into a magnetic colloid, and stirring to obtain a black solution;
and (3) carrying out magnetic adsorption separation on the black solution to obtain a separation product, washing the separation product, and carrying out cold dry grinding to obtain powder to obtain the coalescence material LY-02.
Further, in the step 1, the stirring time is 6-10min, and the stirring speed is 400r/min-700 r/min.
Further, in the step 2, the stirring time is 15-30min, and the stirring speed is 100r/min-400 r/min.
Further, in the step 2, standing for 1-2 hours under the magnetic field environment condition is adopted.
Furthermore, the removal rate of oil sludge substances 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%.
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 is characterized in that a demulsifying material LY-01 and a coalescing material LY-02 are added into the coal chemical industry wastewater to be treated, the surfaces of the demulsifying material LY-01 and the coalescing material LY-02 are provided with abundant positive charges and branched structures, so that colloidal 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 to form a coalescent with larger volume; oil sludge substances in the coal chemical industry wastewater are subjected to demulsification and coalescence through the synergistic effect of the demulsification material LY-01 and the coalescence material LY-02, and finally, separation and removal of oil sludge are realized; meanwhile, the method is beneficial to removing the oil sludge in the coal chemical industry wastewater, reduces the sludge yield, enhances the sludge-water separation effect, reduces the water content of the oil sludge, improves the water quality of the whole effluent, and realizes the efficient treatment of the oil sludge in the coal chemical industry wastewater; the removal rate of oil sludge substances 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%; the wastewater after the pretreatment of the oil sludge can obviously improve the recovery efficiency of the subsequent phenol ammonia, reduce the biochemical treatment difficulty and obviously increase the economic benefit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit 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 demulsifying material LY-01 into coal chemical wastewater to be treated, and stirring for 6-10min under the condition that the stirring speed 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 speed is 100-400 r/min; and then standing and precipitating under the magnetic field environment condition, and separating to obtain the wastewater after the oil sludge treatment.
In the invention, the demulsification material LY-01 is used for performing demulsification treatment on oil sludge substances in coal chemical industry wastewater to be treated so as to enable the oil sludge substances to be aggregated to form aggregates with smaller volume; the demulsification material LY-01 is prepared from a quaternary ammonium salt cationic monomer, an oleophylic hydrophobic monomer and polyalcohol amine; the preparation process comprises the following steps:
s1, mixing a quaternary ammonium salt cationic monomer, an oleophilic hydrophobic monomer and polyalcohol amine to prepare a mixed solution; wherein, the quaternary ammonium salt cationic monomer is one of dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride and methacrylamidoalkyl ammonium chloride; the oleophylic and hydrophobic monomer is one of lauryl methacrylate, isodecyl methacrylate and butyl methacrylate; the polyalcohol amine is polytriethanolamine.
S2, adding an introducing agent into the mixed solution, and carrying out 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 is one of ethylenediamine, n-butylamine and polyethylene polyamine.
S4, separating and purifying the cross-linked polymerization product to obtain the demulsification material LY-01.
In the invention, the coalescing material LY-02 is used for coalescing the aggregates with smaller volume to form a coalescent body with larger volume; the coalescence material LY-02 is prepared from gelatin, a magnetic powder material, citric acid and a demulsification material LY-01, and the preparation process comprises the following steps:
step 01, dissolving gelatin in water to obtain a gelatin solution; adding a magnetic powder material and citric acid into the gelatin solution, and performing ultrasonic stirring to obtain a magnetic colloid; wherein the magnetic powder material is one of iron oxide magnetic powder, chromium dioxide magnetic powder and metal magnetic powder.
And step 02, adding the demulsifying material LY-01 into a magnetic colloid, and stirring to obtain a black solution.
And 03, performing magnetic adsorption separation on the black solution to obtain a separation product, washing the separation product, and performing cold dry grinding to obtain powder to obtain the agglomeration 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 oil sludge substances 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%.
The method for removing the oil sludge in the coal chemical industry wastewater comprises the following steps of preparing a demulsification material LY-01 by adopting a quaternary ammonium salt cationic monomer, an oleophylic hydrophobic monomer and polyalcohol amine; the demulsification material LY-01 is a high molecular compound which carries a large number of positive charge groups, has unique oleophylic and hydrophobic properties and has a rich chain structure on the surface; the oil-water interface agent can efficiently neutralize the surface negative charges of colloidal particles of oil sludge substances, destroy the stability of the oil sludge substances, and enable the oil sludge substances to be quickly adsorbed on an oil-water interface through the interaction force among molecules, thereby destroying O/W emulsion, replacing surfactant and asphaltene molecules, reducing the interface tension and the interface film strength of oil and water, promoting the quick generation of the coagulation effect among oil sludge substance particles, and enhancing the coalescence effect among small oil sludge particles; the coalescence material LY-02 is obtained by modifying the demulsification material LY-01 by using a magnetic material in a magnetic colloid, has rich branched chain structures and specific functional groups as a macromolecular surfactant with excellent performance, can coalesce oil sludge particles dispersed in water, and has a strong promotion effect on the rapid separation of an oil phase, a water phase and a sludge phase in the coal chemical industry wastewater.
In the invention, emulsion breaking material LY-01 and coalescence material LY-02 are added into wastewater to be treated, and both surfaces of the emulsion breaking material LY-01 and the coalescence material LY-02 have abundant 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 coalescence performance of the coalescence material LY-02 to form a coalescence body with larger volume; oil sludge substances in the coal chemical industry wastewater are subjected to demulsification and coalescence through the synergistic effect of the demulsification material LY-01 and the coalescence material LY-02, and finally, the separation and removal of the oil sludge are realized; the method is more beneficial to removing the oil sludge in the coal chemical industry wastewater, simultaneously reduces the sludge yield, enhances the sludge-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 industry wastewater.
Example 1
The embodiment 1 provides a method for removing oil sludge in coal chemical industry wastewater, which includes the following steps:
step 1, taking coal chemical wastewater to be treated, a demulsification material LY-01 and a coalescence material LY-02 according to the volume ratio of 1000:20: 1.
And 2, adding the demulsifying material LY-01 into the coal chemical industry wastewater to be treated, and stirring for 10min at the stirring speed of 700r/min so that the colloid in the coal chemical industry wastewater to be treated is basically destabilized, and partial oil sludge is aggregated to form an aggregate with a small volume, thereby obtaining an intermediate mixed system.
Step 3, adding a coalescence material LY-02 into the intermediate mixing system, and stirring for 30min under the condition that the stirring speed is 100r/min, so that oil sludge substances in the wastewater are agglomerated into a large-volume agglomeration body; standing for 2 hours under the magnetic field environment condition to further agglomerate oil sludge substances, and separating to obtain the wastewater after oil sludge removal.
Example 2
The embodiment 2 provides a method for removing oil sludge in coal chemical industry wastewater, which includes the following steps:
step 1, taking coal chemical wastewater to be treated, a demulsification material LY-01 and a coalescence material LY-02 according to the volume ratio of 1000:10: 1.
And 2, adding the demulsifying material LY-01 into the coal chemical industry wastewater to be treated, and stirring for 6min at the stirring speed of 600r/min so that colloid in the coal chemical industry wastewater to be treated is basically destabilized, and part of oil sludge is aggregated to form an aggregate with a small volume, thereby obtaining an intermediate mixed system.
Step 3, adding a coalescing material LY-02 into the intermediate mixing system, and stirring for 25min under the condition that the stirring speed is 200r/min, so that oil sludge substances in the wastewater are agglomerated into a large-volume agglomerate; standing for 2 hours under the condition of a magnetic field environment to further agglomerate oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
Example 3
This embodiment 3 provides a method for removing oil sludge in coal chemical industry wastewater, including the following steps:
step 1, taking coal chemical wastewater to be treated, a demulsification material LY-01 and a coalescence material LY-02 according to the volume ratio of 800:20: 1.
And 2, adding the demulsifying material LY-01 into the coal chemical industry wastewater to be treated, and stirring for 8min at a stirring speed of 500r/min so that the colloid in the coal chemical industry wastewater to be treated is basically destabilized, and partial oil sludge is aggregated to form an aggregate with a small volume, thereby obtaining an intermediate mixed system.
Step 3, adding a coalescing material LY-02 into the intermediate mixing system, and stirring for 20min under the condition that the stirring speed is 300r/min, so that oil sludge substances in the wastewater are agglomerated into a large-volume agglomerate; standing for 2 hours under the condition of a magnetic field environment to further agglomerate 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 includes the following steps:
step 1, taking coal chemical wastewater to be treated, a demulsification material LY-01 and a coalescence material LY-02 according to the volume ratio of 800:10: 1.
And 2, adding the demulsifying material LY-01 into the coal chemical industry wastewater to be treated, and stirring for 10min at the stirring speed of 400r/min so that the colloid in the coal chemical industry wastewater to be treated is basically destabilized, and partial oil sludge is aggregated to form an aggregate with a small volume, thereby obtaining an intermediate mixed system.
Step 3, adding a coalescing material LY-02 into the intermediate mixing system, and stirring for 15min under the condition that the stirring speed is 400r/min, so that oil sludge substances in the wastewater are agglomerated into a large-volume agglomerate; standing for 2 hours under the condition of a magnetic field environment to further agglomerate oil sludge substances, and separating to obtain the wastewater after the oil sludge is removed.
And (3) test results:
in the invention, the oil sludge removal effect of the removal method is detected by adopting 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, and the SS content is 2000mg/L, and the method specifically comprises the following steps: according to the operation method and the adding conditions determined in the above embodiments 1-4, the method is used for the actual coal chemical industry wastewater, and after the reaction is finished, various parameters of clear liquor effluent are measured to reflect the implementation effects of the specific embodiments; the results of the measurements of the indexes in the above examples are shown in Table 1.
Table 1 removal rates for various indexes of coal chemical wastewater treatment under examples 1 to 4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Oil removal (%) | 48.3 | 49.2 | 49.8 | 48.6 |
| Removal ratio of SS (%) | 97.5 | 98.3 | 98.8 | 97.9 |
| Removal ratio of COD (%) | 36.5 | 38.3 | 39.2 | 36.1 |
From table 1, it can be seen that the method of the present invention is used for removing oil sludge in coal chemical industry wastewater, and has the advantages of high oil sludge removal efficiency and stable effect, which has important guiding significance for the continued healthy development of the coal chemical industry in the future.
According to the invention, by using the demulsification material LY-01 and the coalescence material LY-02, the oil sludge in the coal chemical industry wastewater is effectively removed; the problem that a large amount of coagulant is added to cause overhigh water treatment cost is solved, the efficient coalescence and separation of the oil sludge can be realized, and meanwhile, the polymer coalescence material has the characteristics of small addition amount, small pollution, low cost, good effect, easy separation of the generated oil sludge and the like; not only reduces the pollution to the environment, but also can realize the high-efficiency separation of 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 industry wastewater, the demulsification material LY-01 and the coalescence material LY-02 are added into the coal chemical industry wastewater to be treated, and the demulsification material LY-01 and the coalescence material LY-02 are both high-molecular coalescence materials, and because the high-molecular coalescence materials have rich branched chain structures and specific adsorption functional groups and have the characteristics of high activity, strong demulsification capacity and the like, oil substances in the wastewater can be effectively adsorbed, coalesced and captured by utilizing the rich functional group structures on the surfaces of the polymerization materials, so that the purpose of coacervation separation is achieved, substances such as coal ash in the wastewater can be effectively removed, and congestion caused by a subsequent process is avoided.
In the invention, the separation and removal of the coal chemical industry oil sludge are the key for realizing the harmless treatment of the coal chemical industry wastewater and the sustainable development of the coal chemical industry; the pretreatment process not only can pertinently remove oil substances, phenolic substances and ammonia nitrogen, but also can realize resource recovery of the substances and create good biochemical conditions for microorganisms in a biochemical pool; the oil sludge is removed, substances such as oil and polycyclic aromatic hydrocarbons in the wastewater are fixed in the oil sludge and are separated and removed together, so that the separation of the oil sludge is realized, and part of toxic substances are removed.
The above-described embodiment is only one of the embodiments that can implement the technical solution of the present invention, and the scope of the present invention is not limited by the embodiment, but includes any variations, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed.
Claims (8)
1. A method for removing oil sludge in coal chemical industry wastewater is characterized by comprising 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 coalescence 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 used for performing demulsification treatment on oil sludge substances in the coal chemical industry wastewater to be treated so as to enable the oil sludge substances to be aggregated to form aggregates with smaller volume; the demulsification material LY-01 is prepared from a quaternary ammonium salt cationic monomer, an oleophylic hydrophobic monomer and polyalcohol amine;
the coalescing material LY-02 for coalescing the smaller volume of aggregates to form a larger volume of coalesced bodies; the coalescence material LY-02 is prepared from gelatin, a magnetic powder material, citric acid and a demulsification material LY-01.
2. The method as claimed in claim 1, wherein the volume ratio of the coal chemical wastewater to be treated, the demulsifying material LY-01 to the coalescing material LY-02 is (800- > 1000): (10-20): (1-5).
3. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein the preparation process of the demulsification material LY-01 is as follows:
mixing quaternary ammonium salt cationic monomer, oleophilic hydrophobic monomer and polyalcohol amine to prepare a mixed solution;
adding an introducing agent into the mixed solution to carry out 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-linked polymerization product;
and separating and purifying the crosslinked polymerization product to obtain the demulsification material LY-01.
4. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein the preparation process of the coalescence material LY-02 specifically comprises the following steps:
dissolving gelatin in water to obtain gelatin solution; adding a magnetic powder material and citric acid into the gelatin solution, and performing ultrasonic stirring to obtain a magnetic colloid;
adding the demulsifying material LY-01 into a magnetic colloid, and stirring to obtain a black solution;
and (3) carrying out magnetic adsorption separation on the black solution to obtain a separation product, washing the separation product, and carrying out cold dry grinding on the separation product into powder to obtain the agglomeration material LY-02.
5. 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 400r/min-700 r/min.
6. 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 100r/min-400 r/min.
7. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein in the step 2, the standing is performed for 1-2 hours under the magnetic field environment condition.
8. The method for removing the oil sludge in the coal chemical industry wastewater according to claim 1, wherein the removal rate of oil sludge substances 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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