CN112409630A - Sewage treatment flocculating agent and preparation method thereof - Google Patents
Sewage treatment flocculating agent and preparation method thereof Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
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Abstract
The invention discloses a sewage treatment flocculating agent and a preparation method thereof, belonging to the field of sewage treatment. Comprises the preparation of nano magnetic particles; performing silicon amination on the surface of the nano magnetic particles; preparing a magnetic flocculation material; and (4) coating the magnetic flocculation material. According to the invention, the chitosan sugar and the magnetic material are connected by taking the silane coupling agent and the polycarboxylic acid as a bond bridge to form the magnetic flocculation material with a stable structure, and the structural integrity and the functional integrity are maintained in the high-speed stirring process; in addition, a porous coating is formed on the surface of the magnetic material through gelatin and hydroxypropyl methyl cellulose, so that on one hand, a complete appearance structure of the flocculation material is provided, and on the other hand, through obviously formed pores, the cavity and the surface area of the flocculation material can be improved, and therefore, better adsorption performance is obtained.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a sewage treatment flocculating agent and a preparation method thereof.
Background
The flocculation treatment of sewage is a process of flocculation precipitation of particles in water. Flocculation is that after coagulant is added into water, colloid and dispersed particles of suspended matters generate floccule under the interaction of molecular force and collide with each other to coagulate in the process of sedimentation, the size and mass of the floccule are continuously increased, and the sedimentation speed is continuously increased, so that the aim of solid-liquid separation is achieved. At present, inorganic coagulants and synthetic organic polymeric flocculants widely applied to water purification have the problems of large using amount, single flocculation effect, easy secondary pollution and the like.
The existing magnetic flocculating agent is mainly formed by mixing a flocculating agent and a magnetic material according to a certain proportion, sewage is treated cooperatively, then generated magnetic floc is utilized, and then the aim of solid-liquid separation is achieved by utilizing a magnetic separation technology. Most of the flocculating agents are combined with the magnetic materials into particles through electrostatic interaction, and then are further combined with the micelle in the sewage to form magnetic floccules. In the practical application in-process, according to rabbling mechanism in can flocculating tank, stir sewage through rabbling mechanism, improve the mutual collision probability between flocculating agent and suspended solid colloid or the dispersion, improve flocculation efficiency in proper order. However, only mechanical force is applied between the flocculant and the magnetic material, so that the magnetic flocculant is broken up in the stirring process, and the flocculation effect of the common flocculant can be realized.
Disclosure of Invention
The purpose of the invention is as follows: provides a sewage treatment flocculating agent and a preparation method thereof, which aim to solve the problems involved in the background technology.
The technical scheme is as follows: a flocculation reagent for sewage treatment and a preparation method thereof comprise the following steps:
step 1, preparing nano magnetic particles;
step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methyl cellulose according to a predetermined ratio in advance, and dissolving the mixture in an organic solvent to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 40-50 ℃, removing the gelatin, then washing with deionized water, and drying to obtain the porous coating.
Preferably, the nano magnetic particles are ferroferric oxide nano particles.
Preferably, the preparation method of the ferroferric oxide nanoparticles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding the mixture into deionized water, heating the mixture to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 4-5 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
Preferably, the silane coupling agent is a silane coupling agent KH-540 or a silane coupling agent KH-550. Preferably, the mass ratio of the gelatin to the hydroxypropyl methyl cellulose is 1 (10.8-22.0).
Preferably, the polycarboxylic acid is one of propylene-1, 2, 3-tricarboxylic acid or itaconic acid.
Preferably, the mass ratio of the propylene-1, 2, 3-tricarboxylic acid to the chitosan is 1 (1.85-7.40); the mass ratio of the itaconic acid to the chitosan is 1 (1.61-6.46).
Preferably, the organic solvent is at least one of petroleum ether, acetone and absolute ethyl alcohol.
The invention also provides a flocculating agent obtained by the preparation method of the sewage treatment flocculating agent, wherein the structural formula of the magnetic flocculating material is as follows:
or
Has the advantages that: the invention relates to a sewage treatment flocculating agent and a preparation method thereof, wherein a silane coupling agent and polycarboxylic acid are used as a bond bridge to connect chitosan sugar and a magnetic material to form a magnetic flocculating material with stable structure, and the structural and functional integrity is maintained in the high-speed stirring process; in addition, a porous coating is formed on the surface of the magnetic material through gelatin and hydroxypropyl methyl cellulose, so that on one hand, a complete appearance structure of the flocculation material is provided, and on the other hand, through obviously formed pores, the cavity and the surface area of the flocculation material can be improved, and therefore, better adsorption performance is obtained.
Drawings
FIG. 1 is a first schematic structural view of a flocculation apparatus of the present invention.
FIG. 2 is a second schematic structural view of a flocculation apparatus of the present invention.
Fig. 3 is a schematic view of the structure of the mixing assembly of the present invention.
Fig. 4 is a schematic view of the structure of the rotor member of the present invention.
Fig. 5 is a schematic structural view of the magnetic member of the present invention.
The reference signs are: the device comprises a support 1, a main pipeline 2, a sewage inlet pipe 3, a magnetic flocculant filling pipe 4, a water outlet pipe 5, a mixing component 6, a first rotary disc 7, a second rotary disc 8, a hollow rotary drum 9, a magnetic part 10, a driving component 11, a flocculation settling cavity 12, a flocculate discharge port 13, a clean water discharge port 14, a head part 61, a tail part 62, a connecting part 63, a rotor part 64, a stirring blade 64a, a rolling bearing 64b, a rotating ring 91 and a magnet 92.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
The invention provides a sewage treatment flocculating agent and a preparation method thereof, and the preparation method comprises the following steps:
step 1, preparing nano magnetic particles: the preparation method of the ferroferric oxide nano particles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding the mixture into deionized water, heating the mixture to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 4-5 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
Step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methyl cellulose according to a predetermined ratio in advance, and dissolving the mixture in an organic solvent to form paste; then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 40-50 ℃, removing gelatin, then washing with deionized water, and drying to obtain a porous coating; wherein the organic solvent is at least one of petroleum ether, acetone and absolute ethyl alcohol. A composite coating is formed on the surface of a magnetic material by gelatin and hydroxypropyl methylcellulose, and then the gelatin is dissolved by deionized water to form a porous hydroxypropyl methylcellulose coating on the surface of the magnetic material, so that the contact area and the adsorption capacity of insoluble particles in flocculant sewage are improved.
In the further implementation process, the mass ratio of the gelatin to the hydroxypropyl methyl cellulose is 1 (10.8-22.0). When the proportion of the gelatin is too low, the gelatin cannot form a continuous distribution phase in the composite coating, only a pore structure is formed on the surface of the gelatin, the gelatin cannot penetrate into the coating, and the adsorption capacity of chitosan on insoluble particles in sewage cannot be fully exerted; when the proportion of the gelatin is too high, the holes on the surface of the hydroxypropyl methylcellulose coating are too large to form a stable appearance structure, and the mechanical property of the hydroxypropyl methylcellulose coating is reduced.
In a further implementation process, the polycarboxylic acid is propylene-1, 2, 3-tricarboxylic acid, and the mass ratio of the propylene-1, 2, 3-tricarboxylic acid to the chitosan is 1 (1.85-7.40); the structural formula of the synthesized magnetic flocculation material is as follows:
in the further implementation process, the polycarboxylic acid is itaconic acid, and the mass ratio of itaconic acid to chitosan is 1 (1.61-6.46). The structural formula of the synthesized magnetic flocculation material is as follows:
the invention will now be further described with reference to the following examples, which are intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
A flocculation reagent for sewage treatment and a preparation method thereof comprise the following steps:
step 1, preparing nano magnetic particles: the preparation method of the ferroferric oxide nano particles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding into deionized water, heating to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 4 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methylcellulose in a mass ratio of 1:16.8 in advance, and dissolving in absolute ethyl alcohol to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 48 ℃, removing gelatin, then washing with deionized water, and drying to obtain the porous coating.
Example 2
A flocculation reagent for sewage treatment and a preparation method thereof comprise the following steps:
step 1, preparing nano magnetic particles: the preparation method of the ferroferric oxide nano particles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding into deionized water, heating to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 5 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methyl cellulose in a mass ratio of 1:10.8 in advance, and dissolving the mixture in an acetone solvent to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 50 ℃, removing gelatin, then washing with deionized water, and drying to obtain the porous coating.
Example 3
A flocculation reagent for sewage treatment and a preparation method thereof comprise the following steps:
step 1, preparing nano magnetic particles: the preparation method of the ferroferric oxide nano particles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding into deionized water, heating to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 4 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methyl cellulose at a mass ratio of 1: 22.0 in advance, and dissolving in petroleum ether to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 40 ℃ to remove the gelatin, then washing with deionized water, and drying to obtain the porous coating.
Example 4
Based on example 1, propylene-1, 2, 3-tricarboxylic acid is replaced by itaconic acid, and the mass ratio of itaconic acid to chitosan is 1: 3.22. The structural formula of the synthesized magnetic flocculation material is as follows:
example 5
On the basis of example 1, the silane coupling agent KH-540 was replaced with the silane coupling agent KH-550; the other steps are the same as in example 1.
Example 6
On the basis of example 1, the gelatin and hydroxypropylmethylcellulose mixed paste was replaced with a hydroxypropylmethylcellulose paste.
Step 4, coating with magnetic flocculation material: dissolving hydroxypropyl methyl cellulose in absolute ethyl alcohol in advance to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, washing with deionized water, and drying to obtain the coating.
The other steps are the same as in example 1.
Comparative example
Commercially available magnetic flocculants; guangan chemical Co Ltd in great City
Detection example 1
And (3) stability detection: preparing 1000mL of suspension with the concentration of 1wt% by using a flocculating agent, adding the suspension into a 3L glass reaction kettle, heating to 50 ℃, driving a stirring paddle by using a motor to stir the suspension, gradually increasing the rotating speed of the motor by 500rad/min every 15min until a large amount of black adhesive remains on the glass wall of the glass reaction kettle, and recording the rotating speed of the motor.
Detection example 2
The magnetic flocculant obtained in each example is used for sewage treatment by a special flocculation device (which is described in detail later in the specification). Wherein the flow ratio of the magnetic flocculant to the sewage is 0.2 percent; the output rotation speed of the driving component is 1200 rad/min. And detecting the physical and chemical indexes of the treated sewage.
Specific assay data are shown in the following table:
as is evident from the above experimental data: the magnetic flocculant obtained in the invention has stronger structural stability, and when sewage treatment is carried out, the SS removal rate is more than 91%, the COD reduction rate is more than 85%, and the COD of the water outlet is basically less than 150mg/L, thus reaching the discharge standard.
In order to further understand the practical application effect of the scheme, the flocculation equipment adopted in the invention is introduced. Referring to figures 1 to 5 of the drawings, a sewage treatment flocculation apparatus comprises: the device comprises a support 1, a main pipeline 2, a sewage inlet pipe 3, a magnetic flocculant filling pipe 4, a water outlet pipe 5, a mixing assembly 6, a first rotary disc 7, a second rotary disc 8, a hollow rotary drum 9, a magnetic part 10, a driving assembly 11, a flocculation settling cavity 12, a flocculate discharge port 13, a clean water discharge port 14, a head part 61, a tail part 62, a connecting part 63, a rotor part 64, a stirring blade 64a, a rolling bearing 64b, a driven wheel 71, a rotary ring 91 and a magnet 92.
The sewage pipeline comprises a support 1, a main pipeline 2, a sewage inlet pipe 3, a magnetic flocculant filling pipe 4, a water outlet pipe 5 and a mixing component 6. It is composed ofThe main pipeline 2 is made of non-magnetic materials and erected on the brackets 1 on the left side and the right side, one end of the main pipeline 2 is connected with a sewage inlet pipe 3 through a flange, and sewage is led in at a preset speed through a sewage pump; a magnetic flocculant filling pipe 4 is arranged at the upper part of the main pipeline 2, and a magnetic flocculant is introduced at a preset speed through a feeding pump; the other end of the main pipeline 2 is connected with a water outlet pipe 5, and a mixing component 6 is arranged at the joint of the main pipeline 2 and the magnetic flocculant filling pipe 4. Wherein the flow ratio of the magnetic flocculant to the sewage is 0.01-0.5%; the flow ratio is determined according to the type of a specific flocculating agent, and in the specific implementation process of the company, chitosan microspheres and magnetic material Fe are adopted3O4Performing a crosslinking reaction to form a magnetic flocculant with stable saturation magnetization, wherein the saturation magnetization is 15.47-19.56 Gs; therefore, the flow ratio of the magnetic flocculant to the sewage is 0.08-0.2%.
In a further embodiment, the mixing assembly 6 comprises: the pipe comprises a head part 61 with gradually reduced pipe diameter and trapezoidal section, a tail part 62 with gradually increased pipe diameter and trapezoidal section, a connecting part 63 for connecting the head part 61 and the tail part 62, and a rotor element 64 placed on the connecting part 63. The rotor member 64 is a spiral stirring blade 64a movably mounted on the connecting portion 63. In the specific implementation process, rolling bearings 64b are sleeved at two ends of the stirring blade 64a, and the rolling bearings 64b are fixedly installed on the connecting part 63; the stirring vanes 64a rotate along the central axis of the connecting portion 63 under the impact of the sewage. When the mixed sewage enters the mixing assembly 6 and enters the connecting part 63 from the head part 61, the mixed sewage forms turbulence due to the damping effect of the pipe wall because the pipe diameter is reduced, and the mixing of the magnetic flocculating agent and the sewage is accelerated; then when the mixed sewage enters the connecting part 63 and is impacted, the stirring blades 64a spontaneously rotate along the central axis of the connecting part 63, so that the mixed sewage is driven to form self-rotation, and the mixing of the magnetic flocculant and the sewage is further accelerated; and finally, when the mixed sewage enters the tail part 62 from the connecting part 63, the pressure is suddenly released due to the increase of the pipe diameter, and the mixing of the magnetic flocculant and the sewage is further accelerated due to the functions of air bubble collapse, hydraulic fracture and the like of the mixed sewage. The mixing assembly 6 is suitable for continuous operation, other power equipment does not need to be additionally installed, and the shape and the rotor of the mixing assembly 6 are changed, so that the sewage and the magnetic flocculant are quickly mixed, and the flocculant is uniformly distributed in the sewage.
The flocculation mechanism comprises a first rotating disc 7, a second rotating disc 8, a hollow roller 9, a magnetic part 10 and a driving component 11. The main pipeline 2 is sleeved with a first rotary disc 7 and a second rotary disc 8 through bearings, the first rotary disc 7 and the second rotary disc 8 are fixedly connected through a hollow rotary drum 9, a magnetic part 10 is fixedly installed in the rotary drum, and a driving component 11 is connected with the first rotary disc 7 through a belt. Wherein the driving assembly 11 comprises: the driving motor is fixedly installed on a driving wheel on an output shaft of the speed reducer through a speed reducer in transmission connection with the driving motor through a gear set, and the driving wheel is connected with the driving wheel through a belt in transmission and is fixedly installed on a driven wheel 71 on the first rotating disc 7. After the mixed sewage enters the main pipeline 2, the magnetic flocculating agent adsorbs solid particles in the sewage to form magnetic flocculating particles, and the magnetic flocculating particles keep a suspension state in the mixed sewage due to the small particles and flow forwards at a preset speed; at the moment, the driving motor drives the turntable to rotate along the main pipeline 2 in a preset direction and at a preset speed through the transmission assembly, and further drives the roller and the magnetic part 10 to rotate outside the main pipeline 2 to form a spiral magnetic field rotating at the preset speed; because the magnetic flocculation particles do spiral motion under the action of the spiral magnetic field, the collision probability of the magnetic flocculation particles and solid particles is improved, and the solid particles in the sewage are gradually adsorbed to form a large-volume flocculation group. Through adopting magnetic stirring to replace traditional mechanical stirring, not only can show improvement flocculation efficiency, can avoid appearing moreover because stirring speed is too big, the broken problem of flocculation group that leads to.
In a further embodiment, the magnet 92 is one of a neodymium iron boron magnet 92, a ferrochromium cobalt magnet 92, an alnico magnet 92, or an electromagnet 92. Other magnetic materials are readily suggested to those skilled in the art by their mechanism of operation and are not specifically disclosed herein.
In practical implementation, when the magnetic force of the magnetic member 10 is too strong or the stirring speed is too slow, a large amount of magnetic flocculation may adhere to the inner wall of the pipeline, and the inner wall of the pipeline needs to be cleaned by clean water periodically. In a further implementation, the magnetic element 10 is a rotating ring 91 with a spirally distributed magnet 92 embedded therein; and the polarity orientation of the magnets 92 is the same, the helix angle on the cylindrical swivel 91 is 12-30 degrees, the specific angle is related to the field intensity of the magnets 92, the rotating speed of the magnetic part 10 and the saturation magnetization of the magnetic flocculant, and the rotation angle is preferably 12-30 degrees through mathematical modeling, derivation and experimental research. Due to the rotation angle, the magnetic flocculating particles are still subjected to a longitudinal force component, reducing or increasing the time for the magnetic particles to pass through the main conduit 2. And through the rotation rate of the spiral magnetic field, a preset distance is ensured to be reserved between the magnetic flocculation particles and the pipe wall of the main pipe 2, the magnetic particles are prevented from being adsorbed on the pipe wall of the main pipe 2, and the cleaning frequency is reduced.
In further implementation, the tail 62 of the water outlet pipe 5 is connected with a flocculation precipitation cavity 12, a flocculate discharge port 13 is arranged at the bottom of the flocculation precipitation cavity 12, a clear water discharge port 14 is arranged at the top of the flocculation precipitation cavity 12, and a filter screen is arranged on the clear water discharge port 14. When the mixed sewage enters the flocculation precipitation cavity 12, the flocculation group can be rapidly settled in a short time under the action of gravity due to large volume, and the flocculation discharge port 13 is opened every preset time to discharge the large-volume flocculation group, so that solid-liquid separation is realized.
In order to facilitate understanding of the technical scheme of the sewage treatment flocculation equipment, the working principle of the equipment is briefly explained: leading sewage into a sewage inlet pipe 3 at a preset flow rate through a sewage pump, and adding a magnetic flocculant into a magnetic flocculant filling pipe 4 at a preset flow rate through a feeding pump to form mixed sewage; wherein the flow ratio of the magnetic flocculant to the sewage is 0.01-0.5%; when the mixed sewage enters the mixing assembly 6 and enters the connecting part 63 from the head part 61, the mixed sewage forms turbulence due to the damping effect of the pipe wall because the pipe diameter is reduced, and the mixing of the magnetic flocculating agent and the sewage is accelerated; then when the mixed sewage enters the connecting part 63 and is impacted, the stirring blades 64a spontaneously rotate along the central axis of the connecting part 63, so that the mixed sewage is driven to form self-rotation, and the mixing of the magnetic flocculant and the sewage is further accelerated; finally, when the mixed sewage enters the tail part 62 from the connecting part 63, the pressure is suddenly released due to the increase of the pipe diameter, and the mixing of the magnetic flocculant and the sewage is further accelerated due to the actions of air bubble collapse, hydraulic fracture and the like of the mixed sewage; thereby realizing the rapid mixing of the sewage and the magnetic flocculant and uniformly distributing the flocculant in the sewage; after the mixed sewage enters the main pipeline 2, the magnetic flocculating agent adsorbs solid particles in the sewage to form magnetic flocculating particles, and the magnetic flocculating particles keep a suspension state in the mixed sewage due to the small particles and flow forwards at a preset speed; at the moment, the driving motor drives the turntable to rotate along the main pipeline 2 in a preset direction and at a preset speed through the transmission assembly, and further drives the roller and the magnetic part 10 to rotate outside the main pipeline 2 to form a spiral magnetic field rotating at the preset speed; under the action of a spiral magnetic field, the magnetic flocculation particles perform spiral motion under the action of magnetism, so that the collision probability of the magnetic flocculation particles and solid particles is improved, and the solid particles in the sewage are gradually adsorbed to form a large-volume flocculation group; by regulating and controlling the rotation rate of the spiral magnetic field, a preset distance is ensured to be reserved between the magnetic flocculation particles and the pipe wall of the main pipe 2, and the magnetic particles are prevented from being adsorbed on the pipe wall of the main pipe 2; when the mixed sewage enters the flocculation precipitation cavity 12, the flocculation group can be rapidly settled in a short time under the action of gravity due to large volume, and the flocculation discharge port 13 is opened every preset time to discharge the large-volume flocculation group, so that solid-liquid separation is realized.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (9)
1. A preparation method of a sewage treatment flocculating agent is characterized by comprising the following steps:
step 1, preparing nano magnetic particles;
step 2, performing silicon amination on the surface of the nano magnetic particle: adding the nano magnetic particles prepared in the step 1 into an ethanol solution of a silane coupling agent with the mass part of 25-40%, and mechanically stirring at normal temperature for 8-12 hours; then magnetic separation is carried out, and then the mixture is placed in a vacuum drier for storage;
step 3, preparation of the magnetic flocculation material: dissolving polycarboxylic acid and chitosan with a certain mass ratio in deionized water in advance to obtain a mixed solution A, then dropwise adding the mixed solution A into a suspension of nano magnetic particles with silicon aminated surfaces, uniformly stirring, introducing inert gas, then adding azobisisobutyronitrile as an initiator, heating to 50-60 ℃, continuously stirring for 2-6 hours, and then naturally cooling; then purifying by acetone, carrying out magnetic separation, and then placing in a vacuum drier for storage;
step 4, coating with magnetic flocculation material: mixing gelatin and hydroxypropyl methyl cellulose according to a predetermined ratio in advance, and dissolving the mixture in an organic solvent to form paste; and then soaking the magnetic flocculation material in the paste, quickly taking out, drying in hot air drying equipment, removing the solvent on the surface of the coating, then putting in warm water at 40-50 ℃, removing the gelatin, then washing with deionized water, and drying to obtain the porous coating.
2. The sewage treatment flocculating agent and the preparation method thereof according to claim 1, wherein the nano magnetic particles are ferroferric oxide nano particles.
3. The sewage treatment flocculating agent and the preparation method thereof according to claim 2, wherein the preparation method of the ferroferric oxide nano particles comprises the following steps: mixing ferric sulfate and ferrous sulfate according to the molar ratio of 1:1, adding the mixture into deionized water, heating the mixture to a low-boiling state under the protection of inert gas, slowly adding a sodium hydroxide solution, and reacting for 4-5 hours; then separating the precipitate, washing, freezing and drying to obtain the nano magnetic particles.
4. The sewage treatment flocculating agent and the preparation method thereof according to claim 2, wherein the silane coupling agent is KH-540 or KH-550.
5. The sewage treatment flocculating agent and the preparation method thereof according to claim 1, wherein the mass ratio of the gelatin to the hydroxypropyl methyl cellulose is 1 (10.8-22.0).
6. The sewage treatment flocculating agent and the preparation method thereof according to claim 1, wherein the polycarboxylic acid is one of propylene-1, 2, 3-tricarboxylic acid or itaconic acid.
7. The sewage treatment flocculating agent and the preparation method thereof according to claim 6, wherein the mass ratio of the propylene-1, 2, 3-tricarboxylic acid to the chitosan is 1 (1.85-7.40); the mass ratio of the itaconic acid to the chitosan is 1 (1.61-6.46).
8. The sewage treatment flocculating agent and the preparation method thereof according to claim 1, wherein the organic solvent is at least one of petroleum ether, acetone and absolute ethyl alcohol.
9. A flocculating agent obtained based on the preparation method of the sewage treatment flocculating agent of any one of claims 1 to 8, wherein the magnetic flocculating material has a structural formula as follows:
or
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| JPS5955388A (en) * | 1982-09-22 | 1984-03-30 | Daido Steel Co Ltd | Co-flocculating assistant in magnetic separation treatment |
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