CN113683167A - Magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles - Google Patents
Magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles Download PDFInfo
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- CN113683167A CN113683167A CN202111029021.2A CN202111029021A CN113683167A CN 113683167 A CN113683167 A CN 113683167A CN 202111029021 A CN202111029021 A CN 202111029021A CN 113683167 A CN113683167 A CN 113683167A
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/481—Treatment of water, waste water, or sewage with magnetic or electric fields using permanent magnets
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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
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Abstract
The invention provides a magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles. The sewage treatment system comprises a magnetizing flocculation area, a sedimentation area and a magnetic separation area, wherein low-density magnetic particles with the particle size of 100 nm-20 mu m are added in the magnetizing flocculation area, so that macromolecular pollutants in water are adsorbed by the large specific surface area of the low-density magnetic particles on one hand, and on the other hand, the low-density and low-hardness magnetic particles are used for adsorbing flocculation particles, so that the growth and sedimentation rates of flocs are accelerated, the flocculation effect is improved, and the abrasion to equipment is reduced; meanwhile, large-particle-diameter magnetic powder with the particle diameter of 50-500 mu m is added in the magnetic separation area, and the separation and recovery efficiency of the low-density magnetic particles is improved through the adsorption of the large-particle-diameter magnetic powder on the low-density magnetic particles. The invention is suitable for combined overflow pollution treatment, primary rain treatment and sewage advanced treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles.
Background
At present, the high-efficiency coagulating sedimentation process commonly used in sewage and rainwater treatment mainly comprises a sand-adding high-efficiency sedimentation tank and a magnetic-adding high-efficiency sedimentation tank. A sand-adding efficient settling pool is a primary intensified coagulating-settling process, and features that the heavy and high-density particles of insoluble medium (such as fine sand, garnet and kaoline) are added to the flocculation area, and the gravitational settling of medium and the adsorption of carrier are used to accelerate the growth and settling speed of flocs. The magnetized high-efficiency sedimentation tank is mainly characterized in that the flocculation effect and the sedimentation speed of the whole system are further strengthened by adding high-efficiency recyclable magnetic powder. The magnetic loading flocculation technology is specifically that coagulant, coagulant aid and magnetic seeds are added into sewage to flocculate impurities in the sewage and combine the impurities with the magnetic seeds to form magnetic mud; then adsorb the magnetic mud through the magnetic part of placing in the sewage, separate out magnetic mud from the magnetic part through the desorption device at last to the realization is to the purification of sewage.
However, the two types of commonly used high-efficiency sedimentation tanks still have the following technical difficulties: on one hand, the hardness of gravel and conventional magnetic powder is higher, and the gravel and the conventional magnetic powder have high abrasiveness to equipment and pipelines in the conveying process, so that system equipment, pipelines and the like are easily abraded. On the other hand, the proportion of gravel and magnetic is 4.8 ~ 5.1, is higher than the floc of ordinary flocculation and precipitation far away, and ordinary agitator can't realize containing the homogeneous mixing of magnetic floc in the cell body.
For example, patent CN105060434A discloses a novel sedimentation and clarification tank, which comprises a magnetic flocculation mixing reaction tank and a sedimentation tank, and separates magnetic powder from non-magnetic substances in sludge by using the magnetic property of the magnetic powder. However, the particle size of the magnetic powder adopted by the method is still larger, and the problem of abrasion to sewage treatment equipment is still not solved.
In view of the above, there is a need for an improved magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles to solve the above problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles. The magnetic additive of nano-micro particles with small particle size and low density is developed, the density and hardness of the medium are obviously reduced, the technical difficulties of the conventional sand adding and magnetic settling tank are effectively solved, and the applicability is obviously enhanced; meanwhile, in the magnetic separation equipment, a small amount of magnetic powder with large particle size is added, and the magnetic powder attracts magnetic nano particles to improve the separation and recovery efficiency of the magnetic particles with small particle size.
In order to realize the aim, the invention provides a magnetic coagulation sedimentation sewage treatment system based on low-density magnetic particles, which comprises a magnetizing flocculation area, a sedimentation area and a magnetic separation area, wherein the magnetic particles added in the magnetizing flocculation area are low-density magnetic particles with the particle size of 100 nm-20 mu m so as to improve the flocculation effect; the magnetic separation area is added with large-particle-size magnetic powder with the particle size of 50-500 mu m, and the low-density magnetic particles are adsorbed by the large-particle-size magnetic powder to improve the medium recovery efficiency.
As a further improvement of the invention, the density of the low-density magnetic particles is 1.5-4.5 g/cm3。
As a further improvement of the present invention, the low-density magnetic particles are organic composite magnetic particles or magnetic particles having a porous or hollow structure.
As a further improvement of the invention, the low-density magnetic particles are porous polystyrene magnetic microspheres or porous or hollow-structure magnetic hydrotalcite.
As a further improvement of the present invention, the porous or hollow structure is obtained by template removal of microspheres comprising a magnetic material and polystyrene.
As a further improvement of the invention, the magnetic material is one or more of Fe, Co, Ni and alloy thereof, boron-containing magnet, ferroferric oxide or ferrite.
As a further improvement of the invention, the particle size of the low-density magnetic particle is 100 nm-10 μm, and the particle size of the large-particle-size magnetic powder is 100-300 μm.
A magnetic coagulation sedimentation sewage treatment method based on low-density magnetic particles adopts the sewage treatment system to carry out treatment.
As a further improvement of the invention, the sewage treatment method comprises the following steps:
s1, after sewage enters the magnetic flocculation area, adding the low-density magnetic particles and a flocculating agent to perform slow flocculation;
s2, enabling the sewage flocculated in the step S1 to enter a settling zone, settling and concentrating, collecting clear water, accumulating alum flocs at the lower part of a settling tank, and concentrating the formed sludge at the bottom of the settling zone;
and S3, pumping sludge at the bottom of the settling zone to the magnetic separation zone, and adding the magnetic powder with large particle size to perform magnetic sludge separation.
As a further improvement of the invention, the addition amount of the low-density magnetic particles is 0.5-5 mg/L, and the addition amount of the large-particle-size magnetic powder is 0.5-2 wt% of the sludge.
The invention has the beneficial effects that:
1. according to the sewage treatment method based on magnetic coagulation sedimentation of low-density magnetic particles, provided by the invention, the low-density magnetic particles with the particle size of 100 nm-20 mu m are added in the magnetic flocculation area, so that macromolecular pollutants in water are adsorbed by the large specific surface area of the low-density magnetic particles, and the low-density and low-hardness magnetic particles are adsorbed by the flocculation particles, so that the growth and sedimentation rate of flocs are accelerated, the flocculation effect is improved, the abrasion to equipment is reduced, and the problems of too fast sedimentation and uneven mixing of magnetic powder in a conventional sand adding and magnetic sedimentation tank can be effectively solved. Meanwhile, large-particle-diameter magnetic powder with the particle diameter of 50-500 mu m is added in the magnetic separation area, and the separation and recovery efficiency of the low-density magnetic particles is improved through the adsorption of the large-particle-diameter magnetic powder on the low-density magnetic particles.
2. According to the invention, the magnetic particles with a porous or hollow structure are preferably selected, so that on one hand, the density of the magnetic material can be reduced, the sinking rate is reduced, and the flocculation effect is fully exerted; on the other hand, the porous or hollow structure can further increase the specific surface area of the magnetic particles, thereby improving the adsorption of pollutants in water. The invention can realize high-efficiency flocculation precipitation and ensure high recovery rate of magnetic particles only by controlling the particle size and density of magnetic seeds in a conventional magnetic coagulation precipitation system and adding magnetic powder with large particle size in a matched manner in the separation process, and is suitable for combined flow overflow pollution treatment, primary rain treatment and sewage advanced treatment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a magnetic coagulation sedimentation sewage treatment system based on low-density magnetic particles, which comprises a magnetizing flocculation area, a sedimentation area and a magnetic separation area, wherein the magnetic particles added in the magnetizing flocculation area are low-density magnetic particles with the particle size of 100 nm-20 mu m, so that macromolecular pollutants in water are adsorbed by the large specific surface area of the low-density magnetic particles on one hand, and on the other hand, the flocculating particles are adsorbed by the low-density magnetic particles, so that the growth and sedimentation rate of flocs are accelerated, the flocculation effect is improved, and the abrasion to equipment is reduced by reducing the hardness; and in order to improve the separation recovery rate of small-particle-size low-density magnetic particles, large-particle-size magnetic powder with the particle size of 50-500 mu m is added into the magnetic separation area, and the medium separation recovery efficiency is improved by adsorbing the low-density magnetic particles by the large-particle-size magnetic powder.
Specifically, the main device of the sewage treatment system comprises a water inlet area, a coagulation area, a flocculation area, a precipitation concentration area, a water outlet area, a sludge circulation and discharge system, scum removing equipment and magnetic separation equipment. And adding the low-density magnetic particle suspension into the guide flow barrel through a dosing pump. The concentrated sludge in the sludge concentration zone is returned to the reaction zone through a sludge pump, so that the precipitation efficiency is further improved.
The low-density magnetic particles preferably have a density of 1.5 to 4.5g/cm3The particle size is preferably 100nm to 10 μm, more preferably 200nm to 5 μm, and the particle size of the large particle size magnetic powder is preferably 100 to 300 μm. Because the specific value of the magnetic material is larger, the magnetic low-density particles can be obtained by compounding the magnetic material with a material with low specific gravity; or the magnetic particles with a porous or hollow structure are prepared by a calcination or solvent phase separation method (for example, the porous or hollow structure is constructed by removing an organic phase through high-temperature calcination or organic solvent dissolution) to reduce the density and hardness of the magnetic particles, so that the problems of over-quick sedimentation and uneven mixing of gravel and magnetic powder in a conventional sand adding and magnetism adding sedimentation tank can be effectively solved.
In some embodiments, the low-density magnetic particles are preferably magnetic hydrotalcites having a porous or hollow structure. The porous or hollow structure may be obtained by subjecting microspheres comprising a magnetic material and polystyrene to high temperature calcination, or subjecting microspheres comprising a magnetic material and cellulose acetate butyrate to solvent phase separation. The magnetic hydrotalcite with low density and small grain size is used as the magnetic additive for promoting flocculation, and the flocculation effect can be obviously improved due to the layered structure and the interlayer anion characteristic of the hydrotalcite.
Wherein the magnetic material is one or more of Fe, Co, Ni and their alloy, boron-containing magnet, ferroferric oxide or ferrite, and the ferrite can be Mn-ZnFe2O4Or Ni-ZnFe ferrite2O4。
A magnetic coagulation sedimentation sewage treatment method based on low-density magnetic particles adopts the above recorded sewage treatment system to carry out treatment. The sewage treatment method comprises the following steps:
s1, after sewage enters a magnetic flocculation area, adding low-density magnetic particles and a flocculating agent, and slowly flocculating;
s2, enabling the sewage flocculated in the step S1 to enter a settling zone, settling and concentrating, collecting clear water, accumulating alum floc at the lower part of a settling tank, and concentrating the formed sludge at the bottom of the settling zone;
s3, pumping sludge at the bottom of the settling zone to a magnetic separation zone, and adding magnetic powder with large particle size to perform magnetic sludge separation.
Wherein the addition amount of the low-density magnetic particles is 0.5-5 mg/L, and the addition amount of the large-particle-size magnetic powder is 0.5-2 wt% of the sludge.
Examples 1 to 5
A sewage treatment system and method based on magnetic coagulation sedimentation of low-density magnetic particles are disclosed, wherein the low-density magnetic particles are added, so that the sewage treatment system can adsorb macromolecular pollutants in water and accelerate the growth of flocs, the sedimentation rate of a sedimentation tank is increased, and the abrasion to equipment is reduced. The method comprises the following specific steps:
1) water intake zone
The efficient sedimentation tank has 1 group of 2 seats. The water inlet of each high-efficiency sedimentation tank can be closed by an isolation flashboard.
The water quality requirement of inlet water is as follows: and SS: 70-500 mg/L; COD: 100-400 mg/L; TP is less than or equal to 4 mg/L.
2) Coagulation zone
Each high-efficient sedimentation tank all is equipped with 2 coagulating basin. The coagulation unit is of a rectangular structure and is provided with a rapid stirrer for rapidly mixing the inlet water and the coagulant. After coagulation, sewage enters the high-efficiency sedimentation tank through an underflow passage. The coagulant is preferably polyaluminium chloride, and the addition amount is Al2O3Calculated) 8.5-15 mg/L can be taken; the coagulation time is more than or equal to 2 min; stirring speed gradient G was taken for 250s-1。
3) Flocculation zone
The flocculation tank is internally provided with a diversion barrel which divides the reaction tank into two parts, and the flocculation energy of each part is different. The flocculation speed in the guide barrel is high, and the axial flow impeller is used for stirring, so that water flows in the reactor in a circulating mode. The flow pushing condition between the outer wall of the diversion barrel and the tank wall leads to slow flocculation, and the enlargement and the compaction of alum floc are ensured.
The low density magnetic particle suspension is added to the guide barrel by a dosing pump, and the concentration of suspended solids (alum flocs or sediments) in the stirring area is maintained at an optimal level.
Mechanical flocculation is accomplished through the flocculation agitator, and this flocculation agitator is furnished with the converter, can guarantee to optimize the required energy consumption supply of flocculation according to the condition of quality of water and treatment pattern.
The magnetic nanoparticles are preferably manganomanganic oxide having a particle size of about 100nm to 20 μm, and the amount of the added magnetic nanoparticles is preferably 0.5 to 5 mg/L. The flocculant is preferably polyacrylamide, and the dosage (pure medicament) can be 0.6-1.0 mg/L. The flocculation time at peak flow is more than or equal to 6 min.
4) A precipitation concentration zone
When entering the pre-settling zone with larger area, the moving speed of the alum flocs is slowed down. This avoids the formation of cracks and eddies in the alum flocs and also causes the majority of the suspended solids to settle and concentrate in this zone. The mud bucket is provided with a cone-shaped mud scraper.
The residual alum floc is removed in the inclined tube settling zone. The water distribution in the inclined pipe area is uniform through the flow state design in the pool. Short circuiting of the water flow is avoided, so that the precipitation is completed in an optimum state.
The clarified water is collected by a collection tank system. Alum flocs are accumulated in the lower part of the sedimentation tank, and the formed sludge is concentrated in this part of the area.
The concentration zone can be divided into two layers: one layer is arranged above the conical circulating cylinder, and the other layer is arranged below the conical circulating cylinder. Sludge concentration is mainly carried out in the lower layer.
The ascending flow velocity in the inclined tube area is 10-20 m/h; the ascending flow velocity of the settling zone is 8-16 m/h; the sludge reflux ratio is 1-3%; the sludge discharge concentration is 30-80 g/L; the peak sludge discharge of the single pool is about 45m3/h。
Further preferably, the sludge pump returns the concentrated sludge in the sludge concentration zone to the flocculation tank reaction zone, so that the sedimentation efficiency is further improved.
5) Water outlet area
The upper part of the inclined tube is provided with a clarified water collecting tank, and clarified water enters the water outlet channel through the collecting tank and is collected and discharged.
The effluent quality requirement is as follows: SS is less than or equal to 20 mg/L; COD is less than or equal to 100 mg/L; TP is less than or equal to 1 mg/L.
6) Sludge circulation and discharge system
And pumping out sludge from the bottom of the concentration area, partially returning to the flocculation tank, and automatically discharging partial sludge according to the sludge level.
An ultrasonic mud level meter is arranged in the high-efficiency tank, and the sludge amount in the tank is controlled by a sludge discharge pump. The water content of the concentrated sludge is about 92-98%, and the concentrated sludge is sent to a sludge treatment system by a sludge discharge pump for treatment.
7) Scum removing equipment
Skimming devices are arranged on two sides of the settling zone and are operated intermittently to remove the scum accumulated on the surface.
8) Magnetic separation device
Recovery of magnetic nanoparticle additive media with small particle size is difficult. Therefore, in the magnetic separation process, a small amount of magnetic powder with large particle size is additionally added, and the magnetic nanoparticles are adsorbed by the magnetic powder to improve the recovery efficiency of the medium. The adding amount of the magnetic powder is 0.5-2 wt%.
Table 1 examples 1-5 sewage treatment data
As can be seen from Table 1, magnetic nanoparticles having a particle size of 1 μm are most effective. The undersize particle size of the magnetic nano-micro particles can reduce the recovery rate and slightly reduce the pollutant removal efficiency; the particle size of the magnetic nano-micro particles is too large to facilitate the removal of pollutants. The larger the diameter of the magnetic nanoparticles is, the more favorable the separation and recovery are, and when the magnetic nanoparticles having a small particle size are selected, it is difficult to separate and recover the magnetic nanoparticles without adding magnetic powder having a large particle size at the time of recovery.
Example 6
Compared with the embodiment 2, the system and the method for treating the sewage through the magnetic coagulation sedimentation based on the low-density magnetic particles are different in that,the added magnetic nano-micro particles are magnetic microspheres with hollow structures, and the density is about 3.0g/cm3The method comprises the steps of enriching an iron source on the surface and inside of the porous polystyrene microsphere in an alkaline environment, and then calcining at high temperature to obtain the multi-shell hollow FeO microsphere. The rest is substantially the same as embodiment 2, and will not be described herein.
Example 7
Compared with the embodiment 2, the difference of the magnetic coagulation sedimentation sewage treatment system and the method based on the low-density magnetic particles is that the added magnetic nano-micro particles are ferroferric oxide with a porous structure and the density is about 3.1g/cm3Mixing the ferroferric oxide suspension with polystyrene microspheres coated with cellulose acetate butyrate on the surface, and then dissolving and removing the cellulose acetate butyrate by acetone to obtain the ferroferric oxide and polystyrene composite microspheres with porous structures. The rest is substantially the same as embodiment 2, and will not be described herein.
Example 8
Compared with the embodiment 2, the difference is that the added magnetic nano-micro particles are ferroferric oxide and hydrotalcite composite microspheres with porous structures, and the density is about 3.2g/cm3Mixing the ferroferric oxide suspension with a hydrotalcite metal salt solution, adding a small amount of cellulose acetate butyrate solution, carrying out coprecipitation to obtain composite microspheres, and dissolving and removing the cellulose acetate butyrate by acetone to obtain the ferroferric oxide and hydrotalcite composite microspheres with porous structures. The rest is substantially the same as embodiment 2, and will not be described herein.
Table 2 examples 6-8 sewage treatment data
As can be seen from Table 2, the recovery rate of ferroferric oxide and composite particles thereof is higher than that of trimanganese tetroxide. Meanwhile, the particle size of the composite microspheres is 1 mu m, the processing performance of the composite microspheres of ferroferric oxide and silicon dioxide is slightly improved compared with that of ferroferric oxide, the composite microspheres of ferroferric oxide and hydrotalcite have the best treatment effect on pollutants in water, and the anion exchange capacity of hydrotalcite enhances the treatment effect on TP.
In conclusion, the sewage treatment system and the sewage treatment method of the invention can effectively solve the problems of over fast sinking and uneven mixing of gravel and magnetic powder in the conventional sand adding and magnetizing sedimentation tank by adding low-density magnetic particles with the particle size of 100 nm-20 μm in the magnetizing flocculation area, reducing the sinking rate, accelerating the growth and sedimentation rate of flocs, improving the flocculation effect and reducing the abrasion to equipment. Meanwhile, large-particle-diameter magnetic powder with the particle diameter of 50-500 mu m is added in the magnetic separation area, and the separation recovery rate of the low-density magnetic particles is ensured through the adsorption of the large-particle-diameter magnetic powder on the low-density magnetic particles.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. A sewage treatment system based on magnetic coagulation sedimentation of low-density magnetic particles comprises a magnetizing flocculation area, a sedimentation area and a magnetic separation area, and is characterized in that the magnetic particles added in the magnetizing flocculation area are low-density magnetic particles with the particle size of 100 nm-20 mu m so as to improve the flocculation effect; the magnetic separation area is added with large-particle-size magnetic powder with the particle size of 50-500 mu m, and the low-density magnetic particles are adsorbed by the large-particle-size magnetic powder to improve the medium recovery efficiency.
2. The sewage treatment system based on magnetic coagulation sedimentation of low-density magnetic particles according to claim 1, wherein the density of the low-density magnetic particles is 1.5-4.5 g/cm3。
3. The magnetic coagulation sedimentation sewage treatment system based on low-density magnetic particles as claimed in claim 2, wherein the low-density magnetic particles are organic composite magnetic particles or magnetic particles with a porous or hollow structure.
4. The magnetic coagulation sedimentation sewage treatment system based on low-density magnetic particles as claimed in claim 3, wherein the low-density magnetic particles are porous polystyrene magnetic microspheres or porous or hollow structure magnetic hydrotalcite.
5. The magnetic coagulation sedimentation sewage treatment system based on low density magnetic particles as claimed in claim 3 or 4, wherein the porous or hollow structure is obtained by template removal of microspheres comprising magnetic material and polystyrene.
6. The magnetic coagulation sedimentation sewage treatment system based on low-density magnetic particles according to claim 5, wherein the magnetic material is one or more of Fe, Co, Ni and alloy thereof, boron-containing magnet, ferroferric oxide or ferrite.
7. The sewage treatment system based on magnetic coagulation sedimentation of low-density magnetic particles according to claim 1, wherein the low-density magnetic particles have a particle size of 100nm to 10 μm, and the large-particle-size magnetic powder has a particle size of 100 to 300 μm.
8. A sewage treatment method based on magnetic coagulation sedimentation of low-density magnetic particles, which is characterized in that the sewage treatment system of any one of claims 1 to 7 is adopted for treatment.
9. The sewage treatment method based on magnetic coagulation sedimentation of low-density magnetic particles according to claim 8, which is characterized by comprising the following steps:
s1, after sewage enters the magnetic flocculation area, adding the low-density magnetic particles and a flocculating agent to perform slow flocculation;
s2, enabling the sewage flocculated in the step S1 to enter a settling zone, settling and concentrating, collecting clear water, accumulating alum flocs at the lower part of a settling tank, and concentrating the formed sludge at the bottom of the settling zone;
and S3, pumping sludge at the bottom of the settling zone to the magnetic separation zone, and adding the magnetic powder with large particle size to perform magnetic sludge separation.
10. The sewage treatment method of claim 9, wherein the low-density magnetic particles are added in an amount of 0.5-5 mg/L, and the large-particle-size magnetic powder is added in an amount of 0.5-2 wt% based on the sludge.
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| CN115246672A (en) * | 2022-07-15 | 2022-10-28 | 中建环能科技股份有限公司 | Magnetic medium particle size determination method and coagulation method for magnetic coagulation water treatment technology |
| CN115246672B (en) * | 2022-07-15 | 2024-01-19 | 中建环能科技股份有限公司 | Magnetic medium particle size determination method and coagulation method of magnetic coagulation water treatment technology |
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