CN115159765B - Magnetic crystal inducing material, preparation method thereof and hardness-removing and turbidity-reducing water treatment process applying magnetic crystal inducing material - Google Patents
Magnetic crystal inducing material, preparation method thereof and hardness-removing and turbidity-reducing water treatment process applying magnetic crystal inducing material Download PDFInfo
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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
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus 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
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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Abstract
The invention belongs to the technical field of water treatment, and particularly relates to a magnetic crystal inducing material, a preparation method thereof and a water treatment process for removing hardness and reducing turbidity by using the magnetic crystal inducing material. The material is ferrite type composite metal oxide loaded scaling salt micron particles, wherein the metal oxide at least comprises rare earth element oxides, the prepared crystal inducing material is taken as an inducer to be dispersed into a precipitation reaction system to carry out induced crystallization and hardness removal reaction under the alkaline condition, and the hardness removal water with the Langerial index below 0.1-0.2 is obtained after the scaling tendency is eliminated; adding a coagulant to perform a coagulation sedimentation turbidity reduction reaction; after the flocs are precipitated, the hard scale deposited on the surface of the crystal inducing material in the hard stage is removed through a high-speed shearing machine, and then the inducer is recovered by a magnetic separator. The process has the advantages that the magnetic crystal inducing material is added into the precipitation reaction system to promote the precipitation crystallization and the sedimentation to be rapidly carried out, so that the process time is greatly shortened, and then the magnetic separation recovery of the crystal inducing material is realized.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a magnetic crystal inducing material, a preparation method thereof and a water treatment process for removing hardness and reducing turbidity by using the magnetic crystal inducing material.
Background
In the prior art of removing hardness and reducing turbidity of water treatment, hardness removal and turbidity reduction are separately treated. The hardness removing process comprises the following steps: the ultrasonic technology utilizes mechanical vibration to remove hard scale, has the defect of large power consumption, and is rarely applied at present; the magnetic hardness removal technology achieves the purpose of hardness removal by influencing the physicochemical property of an aqueous solution and the crystallization nucleation and crystal growth process of scale forming substances through a magnetic field, and has the defects of about half a year of effective period, poor high-hardness and large-flow scale prevention effect and magnetic field pollution; high-frequency electric field treatment, which increases the electronegativity of salt crystal particles in water, increases the electric repulsion among the particles and distorts crystals forming salt scale to destroy the growth of the crystals so as to inhibit the growth speed of the crystals, slows down the formation of the scale, weakens the adhesion of the scale, is easy to discharge, and achieves the purpose of removing hardness, and has the defect of energy consumption; the anode sacrificial block is installed, but the influence on the change of the flow rate of the process fluid is large, and the anode sacrificial block is rarely adopted at present; the chemical antiscaling and hardness removing technology needs to add a corrosion inhibitor, an antiscaling agent and the like, so that the distortion of crystals is weakened, the adhesion force is easy to discharge, and the hardness is removed, and the defects of high cost and chemical pollution exist; although the variable frequency resonance antiscale and harding technology has stable descaling and harding effects, the acting distance is limited; the special alloy antiscaling and hard-removing technology needs a large amount of arrangement and has large investment. Therefore, in order to achieve the purpose of removing hardness, a novel efficient hardness removing process is urgently needed to be developed.
At present, the treatment process of turbid water is mainly a coagulation process and is divided into a traditional low-speed coagulation process and a novel high-efficiency coagulation process. The novel high-efficiency coagulation adopts the method of doping particles with larger density, such as quartz sand and magnetic powder Fe, into a coagulation floc 3 O 4 So as to achieve the purpose of rapid precipitation. The density of quartz sand is smaller than that of magnetic powder, so that the quartz sand has poor effect, and the quartz sand is more and more used for the magnetic powder at present. The traditional low-speed coagulation sedimentation rate is generally 1-2 m/h, while the sedimentation rate of the novel high-efficiency coagulation can reach 20-40 m/h. But the hardness of the doped particles cannot be effectively removed at the same time, which greatly limits the application of the high-efficiency coagulation process.
Therefore, the hardness removal and turbidity reduction can not be realized simultaneously in an efficient manner by the existing water treatment process. Therefore, the development of the high-efficiency hardness-removing and turbidity-reducing water treatment process has important significance for practical large-scale water treatment engineering application.
Disclosure of Invention
In one aspect, the invention provides a magnetic crystal inducing material, which has the characteristics of high mechanical strength, stable chemical property, excellent fluidization performance and wide source, is easy to magnetically separate and recover, and has economical efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a magnetic crystal inducing material is ferrite type composite metal oxide loaded with scaling salt micron particles, wherein the metal oxide at least comprises rare earth element oxides.
In one embodiment, the ferrite-type composite metal oxide has a general structural formula A x B y Fe 2 O 4 Wherein A is at least one selected from transition elements Mn, ni, zn and Cu; b is selected from at least one of rare earth elements lanthanum La, europium Eu and cerium Ce, and x + y =1; and/or the presence of a gas in the atmosphere,
the scaling salt is at least one selected from calcium carbonate, calcium phosphate and calcium sulfate.
On the other hand, the invention provides a preparation method of the magnetic crystal inducing material, and ferrite type composite metal oxide micron particles are prepared by a coprecipitation method; and then partially coating the scale salt micron particles on the surface of the ferrite type composite metal oxide micron particles by a precipitation method to obtain the magnetic crystal inducing material. The method is simple and the raw materials are easy to obtain.
In an embodiment, the method comprises the following specific steps:
mixing and proportioning medicament ferric iron salt and corresponding salts of metal elements A and B according to a chemical dose ratio, and precipitating and separating under an alkaline condition to form ferrite type composite metal oxide micron particles;
and mixing the ferrite type composite metal oxide micron particles with a scaling precursor reaction solution of corresponding scaling salts for reaction to obtain the magnetic crystal inducing material.
In other aspects, the invention provides a hardness removal and turbidity reduction water treatment process applying the magnetic crystal inducing material, and the magnetic crystal inducing material is added into a precipitation reaction system to promote precipitation, crystallization and sedimentation to be rapidly carried out, so that the process time is greatly shortened, and then the crystal inducing material is recycled.
A treatment process of hardness-removing and turbidity-reducing water,
the method comprises the following steps: and dispersing the magnetic crystal inducing material serving as an inducer into a precipitation reaction system under an alkaline condition to perform induced crystallization and hardness removal reaction, and adding a coagulant after the scaling tendency is basically eliminated to perform coagulation precipitation and turbidity reduction reaction.
In an embodiment, the particle size of the inducer is 1-10mm and the addition concentration is 5-10g/L; and/or the presence of a gas in the gas,
the duration of the induced crystallization hardness-removing reaction is 20-50min, and the duration of the coagulating sedimentation turbidity-reducing reaction is 5-15min.
In some embodiments, the substantial elimination of the fouling tendency is a water body test that calculates a langelier index of 0.1 to 0.2 or less.
In some embodiments, further comprising the step of:
after the coagulation sedimentation turbidity reduction reaction is finished, the hard scale deposited on the surface of the crystal inducing material in the hard removing stage is stripped through a high-speed shearing machine and then recycled by using a magnetic separator.
In some embodiments, the induced crystallization de-hardening reaction and the coagulating sedimentation turbidity reduction reaction occur in the same fluidized bed reactor or stirred tank reactor.
The invention adopts the technical scheme and at least has the following beneficial effects:
1. the magnetic crystal inducing material is prepared by loading scaling salt micron particles on the surface of the ferrite type composite metal oxide by a precipitation method, is easy to magnetically separate and recover, and has the advantages of high mechanical strength, stable chemical property, excellent fluidization performance and wide source; the ferrite type composite metal oxide material contains rare earth elements, the coordination number of the rare earth elements is large, and the ferrite type composite metal oxide material and scale molecules can form ligands with strong acting force, so that the composite bimetal oxide A in the form x B y Fe 2 O 4 Compared with the traditional crystal inducing material such as Fe 3 O 4 The crystal inducing effect is stronger;
2. according to the scheme, the scaling salt is coated on part of the surface of the ferrite type composite metal oxide by a precipitation method, so that the crystal inducing effect of the inner ferrite type composite metal oxide and the outer scaling salt can be synchronously realized, and the scaling salt load particles and precipitated crystals in a precipitation reaction system are the same substance or have similar structures, so that the interfacial tension between the surface of a carrier and the surfaces of the precipitated crystals can be reduced, a saturated solution is easy to infiltrate, and the crystallization process is more favorably realized;
3. the magnetic crystal inducing material is added as an inducer of a precipitation reaction system, so that high-efficiency induction and hardness removal can be realized, and the magnetic crystal inducing material is used as high-density particles to be mixed in coagulated flocs in a coagulating precipitation step, so that the sedimentation rate is accelerated, and the turbidity is efficiently reduced;
4. after the hard scale deposited on the surface of the crystal inducing material in the hard removing stage is stripped through a high-speed shearing machine, the inducer is recovered by a magnetic separator;
5. the induced crystallization process reduces the sludge amount of the system, greatly improves the water treatment efficiency, greatly reduces the scaling tendency of the effluent after hardness removal, has the Langerl index below 0.1-0.2, can reach the effluent suspended matters below 3 mg/L, has the turbidity below 1 NTU, has the total phosphorus below 0.3 mg/L and saves the coagulant amount by 20-35%.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims. The reagents used in the examples were commercially available.
The application provides a magnetic crystal inducing material, which is ferrite type composite metal oxide loaded scaling salt micron particles. Wherein the ferrite type composite metal oxide has a structural general formula A x B y Fe 2 O 4 Wherein A is at least one selected from transition elements Mn, ni, zn and Cu; b is at least one of rare earth elements lanthanum La, europium Eu and cerium Ce, and x + y =1. The scaling salt is selected from calcium carbonate, magnesium carbonate and/or calcium sulfate. The complex bimetal oxide A in the form has a large coordination number of the rare earth element and can form a ligand with a strong action force with scale molecules x B y Fe 2 O 4 Inherently having greater strengthCrystal induction. The scale-forming salt micron particles are loaded on the carrier, and the loaded particles and precipitated crystals in a precipitation reaction system are the same substance or have a similar structure, so that the interfacial tension between the surface of the carrier and the surfaces of the precipitated crystals can be reduced, a saturated solution is easy to infiltrate, and the crystallization process is more favorably realized. And the crystal inducing material can be recovered through magnetic separation, so that the treatment cost is saved.
On the other hand, the application provides a preparation method of the magnetic crystal inducing material, which comprises the following steps:
preparing ferrite type composite metal oxide micron particles by a coprecipitation method;
and partially coating the scale-forming salt microparticles on the surfaces of the ferrite type composite metal oxide microparticles by a precipitation method.
Specifically, mixing and proportioning a medicament ferric iron salt and corresponding salts of an element A and an element B according to a chemical dose ratio, after the mixture is completely dissolved in deionized water, slowly adding 5mol/L NaOH solution into the mixture under vigorous stirring to obtain a precipitate suspension, separating the solution, washing the solution with absolute ethyl alcohol and distilled water in sequence, and drying and storing the solution. Wherein the molar ratio of the B element to the A element is 1. The average diameter of the ferrite type composite metal oxide particles is controlled to be 1-10 micrometers.
Mixing 1mol/L scaling precursor reaction solution of scaling salts with 1mol/L ferrite type composite metal oxide micron particles for reaction, controlling the reaction degree, so that the surface of the ferrite type composite metal oxide micron particles is partially covered by the scaling salts by about 1/20, and obtaining the magnetic crystal inducing material after magnetic separation, wherein the grain diameter of the obtained crystal inducing material is basically unchanged after loading because the scaling salts precipitated on the surface are few; the precursor reaction solution is a solution capable of producing scaling salt through self-reaction, such as a mixed solution of calcium chloride and sodium carbonate for calcium carbonate, a mixed solution of sodium phosphate and calcium chloride for calcium phosphate, and a mixed solution of sodium sulfate and calcium chloride for calcium sulfate; the two reactants in the precursor reaction solution are prepared according to an equimolar ratio.
In the above embodiment, the surface of the ferrite-type composite metal oxide is only partially loaded by the scaling salt micro-particles, so that both surfaces play a role in inducing crystallization (the surface of the ferrite-type composite metal oxide and the surface of the scaling salt micro-particles), the hardness removal efficiency is remarkably improved, and the magnetic crystal inducing material can also be used as high-density particles to be mixed in the coagulated flocs to accelerate the sedimentation rate, so that the hardness removal and turbidity reduction requirements of the water treatment process can be efficiently realized at the same time.
The magnetic crystal inducing material obtained by the preparation steps is easy to magnetically separate and recover, and has the advantages of high mechanical strength, stable chemical properties, excellent fluidization performance and wide sources.
In other aspects, the application also provides a water treatment process for removing hardness and reducing turbidity by using the magnetic crystal inducing material. The method comprises the following specific steps:
after raw water is added with alkali, dispersing the prepared crystal inducing material serving as an inducer into a precipitation reaction system under an alkaline condition for inducing crystallization and hardness removal reaction, and removing the scaling tendency to obtain hard water with the Langerl index of below 0.1-0.2;
adding a coagulant to perform a coagulation sedimentation turbidity reduction reaction;
after the flocs are precipitated, peeling off the hard scale deposited on the surface of the crystal inducing material in the hard stage by a high-speed shearing machine, and recovering the inducer by using a magnetic separator;
adding acid to adjust the pH value of the effluent after coagulation turbidity reduction treatment to the pH value of the raw water.
In some embodiments, the inducer has a particle size of 1-10mm and is added at a concentration of 5-10g/L; the time for carrying out the induced crystallization and hardness removal reaction is 20-50min, and the time for carrying out the coagulating sedimentation and turbidity reduction reaction is 5-15min.
In the embodiment, the crystal inducing material is added as an inducer of a precipitation reaction system, so that the hardness can be efficiently induced and removed, and in the step of coagulating sedimentation, the crystal inducing material is used as high-density particles to be mixed in coagulated flocs, so that the sedimentation rate is accelerated, and the turbidity is efficiently reduced; the water treatment process can adopt a fluidized bed reactor or a stirring reaction tank, and the two tasks of hardness removal and turbidity reduction of water are completed in the same process, so that the working procedures are saved, the treatment cost is reduced, the effluent quality is good, the process operation is stable and reliable, and the operation is simple and convenient.
The induced crystallization process reduces the sludge amount of the system, greatly improves the water treatment efficiency, greatly reduces the scaling tendency of the effluent after hardness removal, has the Langerl index below 0.1-0.2, can reach the effluent suspended matters below 5 mg/L, has the turbidity below 1 NTU, has the total phosphorus below 0.3 mg/L and saves the coagulant amount by 20-35%.
The technical solution of the present invention and the technical effects achieved by the technical solution are described below with reference to specific embodiments. The crystal inducing material with smaller grain size of the same material can provide larger specific surface area, the crystal inducing effect is better, but the too small grain size is not beneficial to engineering operation, so the crystal inducing material with the average grain size of 10 microns is adopted in the following embodiments in combination with the actual working condition of engineering application and better embodying the difference among the crystal inducing materials.
Example 1
The embodiment aims at reverse osmosis concentrated water and backwashing water of a front filter thereof, and the reverse osmosis concentrated water and the backwashing water of the front filter are treated by using a reaction tank.
Taking La: mn molar ratio of 1 1/10 Mn 9/10 Fe 2 O 4 The loaded calcium carbonate microparticles are used as an efficient inducer, added into mixed water consisting of reverse osmosis concentrated water and back washing water of a pre-filter, carried out by adopting a reaction tank, subjected to hardness removal induced crystallization reaction for 30 minutes after adding alkali, then added with a coagulant for turbidity reduction reaction for 10 minutes, subjected to efficient precipitation in a precipitation tank to produce water with a Langerl index of 0.1, effluent suspended matters of 2.2 mg/L, turbidity of 0.8 NTU, total phosphorus of 0.26 mg/L and the amount of the coagulant saved by 21 percent. And treating the inducer by a high shear device, and recycling the inducer by using a magnetic separator.
For comparison, a conventional hardness-removing induced crystallization reaction test was carried out by adding only an alkali without adding a crystal-inducing material, and the other test steps and reaction conditions were completely the same as those described above, with the result that the Langerl index of produced water was 0.3, the suspended matter in the effluent was 3.2 mg/L, the turbidity was 1.5 NTU, and the total phosphorus was 0.5 mg/L, and no coagulant could be saved, and it was found that the quality of produced water was inferior to that when the crystal-inducing material was added.
For comparison, a hardness-removing induction crystallization test using a conventional magnetic body (iron oxide, hydrated iron oxide, or ferroferric oxide) was also performed. The three conventional magnetic substances with the concentration of 8g/L are respectively added into the mixed water consisting of the reverse osmosis concentrated water and the backwashing water of the pre-filter, the same test steps and conditions are adopted, and the result is that the Langerl index of the produced water is 0.24, the suspended substance of the produced water is 3.1 mg/L, the turbidity is 1.3 NTU, the total phosphorus is 0.45 mg/L, and the coagulant cannot be saved. Therefore, the addition of the conventional magnetic substance can ensure that the quality of the produced water is better than that of the conventional process of only adding alkali without adding any crystal inducing material, but compared with the case of adding the crystal inducing material in the invention, the crystal inducing effect is poor, the quality of the produced water is also poor, the addition amount of a coagulant in a coagulation process cannot be saved, the sedimentation process cannot be simultaneously promoted, and the hardness removal and turbidity reduction requirements in the water treatment process cannot be efficiently and simultaneously realized.
For comparison, three conventional magnetic bodies (iron oxide, hydrated iron oxide or ferroferric oxide) were loaded with calcium carbonate microparticles using the same procedure in the present application, and then subjected to the hardness removal induced crystallization test under the same conditions. As a result, the Langerl index of the produced water was 0.22, the suspended matter in the effluent was 3.0 mg/L, the turbidity was 1.2 NTU, the total phosphorus was 0.4 mg/L, and the amount of coagulant was saved by 10%. It can be seen that the quality of produced water is poorer than that of produced water obtained by adding the crystal inducing material of the invention, so that the crystal inducing effect of the conventional magnetic body is weaker than that of the crystal inducing material of the invention after loading calcium carbonate microparticles, and the promotion effect on the turbidity reducing process is limited.
The embodiment shows that the magnetic crystal inducing material has obvious water treatment advantages compared with the traditional crystal inducing material, the result is not only shown in the remarkable improvement of the hardness removing effect, but also in the promotion effect of the addition of the magnetic crystal inducing material on the subsequent turbidity reducing treatment, and the effects of hardness removing and turbidity reducing which cannot be realized in the related art are realized at the same time and efficiently.
Example 2
This embodiment utilizes the reaction tank to handle to certain coal chemical industry enterprise's recirculated cooling water.
Taking Eu: zn molar ratio of 1 1/9 Zn 8/9 Fe 2 O 4 The loaded calcium carbonate microparticles are used as an efficient inducer, added into circulating cooling water of a certain coal chemical industry enterprise, carried out by adopting a reaction tank, subjected to hardness removal induced crystallization reaction for 40 minutes after alkali is added, then added with a coagulant for turbidity reduction reaction for 15 minutes, subjected to efficient precipitation in a precipitation tank, and then the produced water has the Langerl index of 0.15, the effluent suspended matter can reach below 2.5 mg/L, the turbidity is 0.89 NTU, the total phosphorus is 0.25 mg/L, and the coagulant dosage is saved by 28%. And treating the inducer by a high shear device, and recycling the inducer by using a magnetic separator.
Example 3
This embodiment utilizes the fluidized bed to handle to the recirculated cooling water of a certain petrochemical enterprise.
Taking La: zn molar ratio of 1 1/10 Zn 9/10 Fe 2 O 4 The loaded calcium carbonate microparticles are used as an efficient inducer, added into circulating cooling water of a petrochemical enterprise, carried out by a fluidized bed, subjected to hardness removal induced crystallization reaction for 20 minutes after alkali is added, then added with a coagulant for turbidity reduction reaction for 12 minutes, the Langerl index of produced water is 0.14, the suspended matters in the effluent can reach below 2.1 mg/L, the turbidity is 0.85 NTU, the total phosphorus is 0.2 mg/L, and the concrete dosage is saved by 30%. And treating the inducer by a high shear device, and recycling the inducer by using a magnetic separator.
Example 4
This embodiment utilizes the fluidized bed to handle to the recirculated cooling water of a certain coal chemical industry enterprise.
Taking Ce: zn molar ratio of 1 1/11 Zn 10/11 Fe 2 O 4 The loaded calcium carbonate microparticles are used as an efficient inducer, added into circulating cooling water of a certain coal chemical industry enterprise, carried out by a fluidized bed, added with alkali, subjected to hardness removal induced crystallization reaction for 25 minutes, added with a coagulant for turbidity reduction reaction for 10 minutes, the produced water has a Langeri index of 0.13, the suspended matters in the produced water can reach below 2.7 mg/L, the turbidity is 0.8 NTU, the total phosphorus is 0.23 mg/L, and the concrete dosage is saved by 35%. And treating the inducer by a high shear device, and recycling by using a magnetic separator.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A magnetic crystal inducing material is characterized in that the material is ferrite type composite metal oxide loaded scaling salt micron particles;
the structural general formula of the ferrite type composite metal oxide is A x B y Fe 2 O 4 Wherein A is at least one selected from transition elements Mn, ni, zn and Cu; b is selected from at least one of rare earth elements lanthanum La, europium Eu and cerium Ce, and x + y =1;
the scaling salt is at least one selected from calcium carbonate, calcium phosphate and calcium sulfate.
2. The method of preparing a magnetically attractable material as claimed in claim 1, comprising the steps of:
preparing ferrite type composite metal oxide micron particles by using a coprecipitation method;
and partially coating the scale salt micro-particles on the surfaces of the ferrite type composite metal oxide micro-particles by a precipitation method.
3. The method of claim 2, wherein: the method comprises the following specific steps:
mixing and proportioning medicament ferric iron salt and corresponding salts of metal elements A and B according to a chemical dose ratio, and precipitating and separating under an alkaline condition to form ferrite type composite metal oxide micron particles;
and mixing the ferrite type composite metal oxide micron particles with a scaling precursor reaction solution of corresponding scaling salts for reaction to obtain the magnetic crystal inducing material.
4. A hardness-removing and turbidity-reducing water treatment process is characterized by comprising the following steps:
a magnetically attractable material as claimed in claim 1;
the method comprises the following steps:
dispersing the magnetic crystal inducing material serving as an inducer into a precipitation reaction system under an alkaline condition to perform induced crystallization and hardness removal reaction, and adding a coagulant after the scaling tendency is basically eliminated to perform coagulating sedimentation and turbidity reduction reaction;
wherein, the substantial elimination of the scaling tendency means that the calculated Langerian index of the water body detection is below 0.1-0.2.
5. The hardness-removing and turbidity-reducing water treatment process according to claim 4,
the granularity of the inducer is 1-10mm, and the adding concentration is 5-10g/L; and/or the presence of a gas in the gas,
the duration of the induced crystallization hardness-removing reaction is 20-50min, and the duration of the coagulating sedimentation turbidity-reducing reaction is 5-15min.
6. The hardness-removing and turbidity-reducing water treatment process according to claim 4, further comprising
The method comprises the following steps:
and after the coagulation sedimentation turbidity reduction reaction is finished, stripping and removing hard scale deposited on the surface of the crystal inducing material in the hard stage through a high-speed shearing machine, and recycling by using a magnetic separator.
7. The hardness-removing and turbidity-reducing water treatment process according to claim 4,
the induced crystallization hardness-removing reaction and the coagulating sedimentation turbidity-reducing reaction occur in the same fluidized bed reactor or a stirring reaction tank.
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