CN102908997A - Compound water treatment agent and preparation method and application of water treatment agent - Google Patents
Compound water treatment agent and preparation method and application of water treatment agent Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 150000001875 compounds Chemical class 0.000 title abstract 6
- 239000000126 substance Substances 0.000 claims abstract description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 13
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229940080314 sodium bentonite Drugs 0.000 claims abstract description 13
- 229910000280 sodium bentonite Inorganic materials 0.000 claims abstract description 13
- 239000010457 zeolite Substances 0.000 claims abstract description 13
- 229920001661 Chitosan Polymers 0.000 claims abstract description 12
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 12
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 36
- 239000000725 suspension Substances 0.000 claims description 13
- 238000007873 sieving Methods 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000967 suction filtration Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 239000002957 persistent organic pollutant Substances 0.000 claims description 8
- 239000003463 adsorbent Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 11
- 239000003792 electrolyte Substances 0.000 abstract description 8
- 150000002500 ions Chemical class 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000002203 pretreatment Methods 0.000 abstract description 2
- 239000000356 contaminant Substances 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 description 22
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 11
- RLFWWDJHLFCNIJ-UHFFFAOYSA-N 4-aminoantipyrine Chemical compound CN1C(C)=C(N)C(=O)N1C1=CC=CC=C1 RLFWWDJHLFCNIJ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 4
- 238000002798 spectrophotometry method Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000000701 coagulant Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000002156 adsorbate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 229940092782 bentonite Drugs 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a compound water treatment agent and a preparation method and an application of the water treatment agent. The compound water treatment agent comprises the following components in parts by weight: 48-70 parts of sodium bentonite, 8-15 parts of kieselguhr, 8-15 parts of zeolite, 6-10 parts of magnetic substance, 5-7 parts of chitosan and 3-5 parts of polyacrylamide. The preparation method of the compound water treatment agent is simple, and a material source is wide. With the adoption of the compound water treatment agent, heavy metal ions and organic contaminants in water can be removed while electrolyte concentration in the water can be lowered, and solid-liquid separation can be conducted quickly by virtue of a magnetic filter method. The compound water treatment agent can be applied to a pre-treatment process of a reverse osmosis system, facilitates increasing the water production rate of the reverse osmosis system, reduces operating pressure of the reverse osmosis system, and is significant in practical value and broad in market prospect.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a composite water treatment agent, and a preparation method and application thereof.
Technical Field
At present, most domestic industrial enterprises use reverse osmosis membrane (RO) technology to carry out process wastewater recycling treatment, but the existing RO treatment process generally has the defects of easy blockage, frequent cleaning, incomplete pollutant removal, low water yield, high working pressure and the like, one of the main reasons is that the electrolyte concentration in raw water is relatively high, although the conventional pretreatment process of adding an inorganic coagulant can remove part of pollutants such as heavy metal ions, organic matters and the like, the electrolyte concentration in water can not be reduced to the maximum extent, namely the conductivity in water can not be effectively reduced, and researches show that: fouling will be more and more severe with increasing conductivity. Thus, the conductivity of the feed water to the reverse osmosis system will have an effect on the water production.
Adsorption is the process of separating a component from a mixture by utilizing the selective adsorption capacity of an adsorbent for the component in a liquid, so that the component is enriched on the surface of the adsorbent. Therefore, inorganic coagulant, such as polyaluminium chloride or polyferric chloride and other chemical substances, does not need to be added into the water body. Therefore, compared with the conventional coagulation method, the adsorption method can avoid the increase of the electrolyte concentration in the water body caused by adding an inorganic coagulant, thereby reducing the electrolyte concentration in the water to the maximum extent.
Although the technology for modifying a single kind of natural mineral or multiple kinds of natural minerals, such as the preparation of modified bentonite, the preparation of modified zeolite adsorbent, the preparation of nano magnetite/diatomite composite, the preparation of magnetic composite organic bentonite, etc., has been developed at present, the existing adsorbent cannot comprehensively remove heavy metal ions and organic pollutants in water because the characteristics of different kinds of minerals, such as different surface adsorption effects, different pore channel filtration effects, etc., cannot be comprehensively considered in the process of selecting mineral kinds, and how to synergistically remove organic pollutants cannot be considered in the modification process, and the problems of single function and poor treatment effect exist in the water treatment process.
In both coagulation and adsorption methods, there is a problem that the treated precipitate (or suspended matter) cannot be separated from the water body quickly.
Therefore, the reverse osmosis membrane pretreatment method capable of removing heavy metal ions and organic pollutants in water, reducing the concentration of electrolyte in water and realizing rapid solid-liquid separation is developed, and has wide application prospect in the water treatment industry.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention mainly aims to provide the composite water treatment agent which has comprehensive functions and good effect and can realize the quick solid-liquid separation.
The invention also aims to provide a preparation method of the composite water treatment agent.
The invention also aims to provide application of the composite water treatment agent.
The purpose of the invention is realized by the following technical scheme:
a composite water treatment agent comprises the following components in parts by weight:
wherein,
the sodium bentonite, the diatomite and the zeolite are natural mineral products;
the particle size of the sodium bentonite, the diatomite and the zeolite is 150-200 meshes;
the magnetic substance has a specific magnetization coefficient of chi0>12.6×10-8m3Iron oxide compounds with a particle size of less than 100 μm/kg; preferably gamma-Fe with condensed gaseous sol and brownish red powder in dry state2O3；
The magnetic substance is preferably separated from the smoke dust discharged by the steel plant by adopting a magnet block with the magnetic field intensity of 1000-1500 Gs.
The preparation method of the composite water treatment agent comprises the following specific steps:
(1) mixing 48-70 parts by weight of sodium bentonite, 8-15 parts by weight of diatomite, 8-15 parts by weight of zeolite and 6-10 parts by weight of magnetic substances, and adding water to prepare a suspension with the weight concentration of 8-10%;
(2) adding 5-7 parts by weight of chitosan into water to prepare a chitosan solution with the weight concentration of 1-2%, adding the chitosan solution into the suspension obtained in the step (1), stirring for 4-5 hours at 45-55 ℃, cooling to room temperature, washing with water, performing suction filtration, drying, crushing and sieving to obtain a powdery substance;
(3) adding 3-5 parts by weight of polyacrylamide into water to prepare a 1-2% polyacrylamide solution, adding the powdery substance obtained in the step (2) into the polyacrylamide solution, stirring for 4-5 hours at 50-55 ℃, cooling to room temperature, performing centrifugal separation, water washing, suction filtration, vacuum drying to constant weight, and finally crushing and sieving to obtain a powdery composite water treatment agent;
wherein,
in the step (2), the drying temperature is 95 ℃;
in the step (2) and the step (3), the sieving is carried out by a sieve with a sieve opening of 100 meshes;
in the step (3), the temperature of vacuum drying is 55 ℃;
in the step (3), the centrifugation is performed at the rotating speed of 1500 r/min.
The composite water treatment agent is applied to removing particle suspended matters, heavy metals or organic pollutants in water, and particularly applied to a pretreatment stage of a reverse osmosis membrane system as an adsorbent.
The principle of the invention is as follows:
according to the invention, by utilizing the multifunctional characteristics of mineral materials such as adsorption, ion exchange and catalysis, three natural minerals of sodium bentonite, diatomite and zeolite with different surface and pore diameter characteristics are preferably adopted, and the three natural minerals are modified by the added magnetic substances, chitosan and polyacrylamide to prepare a novel composite water treatment agent, so that the physical adsorption and migration and diffusion of adsorbate in the adsorption process are enhanced, the adsorption balance speed is accelerated, and the adsorption performance is obviously improved; the invention has obviously improved adsorption performance on organic pollutants and heavy metals, has obvious adsorption effect on phenol, can effectively reduce the concentration of electrolyte in water, overcomes the problems of single function and poor treatment effect of the traditional mineral in the water treatment process, and reflects the obvious difference from the use of single components or the superposition function of each component in the types and the adsorption quantity of the adsorbate.
In addition, the added magnetic substance is separated from the smoke dust discharged by a steel plant by adopting the magnet blocks with the magnetic field intensity of 1000-1500 Gs, and when the composite water treatment agent is applied, the magnetic substance can also play a role in strengthening adsorption and endowing magnetic characteristics to precipitates, and when an external magnetic field is utilized to act on the magnetic substance, the precipitates (or suspended matters) can be quickly separated from a water body, so that the invention has wide application prospect in the aspect of removing particle suspended matters and organic pollutants in water, particularly in the aspect of being used as an adsorbent in the pretreatment stage of a reverse osmosis membrane system.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the preparation method of the composite water treatment agent is simple and the material source is wide.
(2) The composite water treatment agent can remove heavy metal ions and organic pollutants in water, can reduce the concentration of electrolyte in the water, can perform quick solid-liquid separation by means of a magnetic filtration method, can be used as a pretreatment process of a reverse osmosis system, is beneficial to improving the water yield of the reverse osmosis system and reducing the working pressure of the reverse osmosis system.
(3) The invention can be popularized in the water treatment industry, and has obvious practical value and wide market prospect.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
Magnetic substances are separated from smoke dust discharged from a steel plant by adopting magnet blocks with the magnetic field intensity of 1000-1500 Gs, the separated magnetic substances are in a sol condensation state when the smoke dust is in a gas state and are in a brownish red powder state when the smoke dust is in a dry state, and the magnetic substances are prepared into the smoke dust with the particle size of less than 100 mu m and the specific magnetization coefficient x by adopting a screening method0＞12.6×10-8m3Magnetic particles per kg; the main active component is gamma-F by X-ray diffraction analysis2O3Chemical analysis of magnetic particles, Fe2O3The content (wt%) of (B) is 95.3% -98.6%.
Selecting purified sodium bentonite, diatomite and zeolite natural mineral products with the particle size of 150-200 meshes for later use.
Example 2
(1) 35g of sodium bentonite, 4g of diatomite, 4g of zeolite and 3g of magnetic substance in example 1 are weighed respectively and placed in a 2000ml conical flask, water is added to prepare suspension with the weight concentration of 8%, and the suspension is stirred uniformly.
(2) Adding 250ml of 1% chitosan solution into the suspension obtained in the step (1), stirring for 5 hours at 45 ℃, then performing suction filtration, washing with water, drying at 95 ℃, crushing, and sieving with a 100-mesh sieve to obtain a powdery substance.
(3) And (3) adding 48.5g of the powdery substance obtained in the step (2) into 150ml of 1% polyacrylamide solution, continuously stirring for 4 hours at 50 ℃, then carrying out centrifugal separation at the speed of 1500r/min, water washing, suction filtration and vacuum drying at 55 ℃ to constant weight, and finally crushing and sieving by a 100-mesh sieve to obtain the powdery composite water treatment agent 1.
(4) Taking 1g of the powdery composite water treatment agent 1 obtained in the step (3), adding 500ml of Pb with the electric conductivity of 3830 mu s/cm2+The pH of the solution was adjusted to 6 in a solution having a concentration of 20mg/L and a concentration of 20mg/L phenol. The solution was shaken on a 25. + -. 1 ℃ constant temperature shaker for 24 hours at a shaking rate of 200 rpm. Determination of Pb by atomic absorption spectrophotometry2+The concentration of the lead-free acid is measured by adopting a 4-aminoantipyrine spectrophotometry method, the conductivity in the water body is measured by adopting a conductivity meter, and the treated Pb is2+The concentration is 1.56mg/L, the phenol concentration is 7.16mg/L, and the composite water treatment agent is used for treating Pb2+The removal rate of (2) was 92.2%, the adsorption capacity was 9.22mg/g, the removal rate of p-phenol was 64.2%, the adsorption capacity was 6.42mg/g, the conductivity was 180. mu.s/cm, and the decrease was 95.3%.
Example 3
(1) 24g of sodium bentonite, 7.5g of diatomite, 7.5g of zeolite and 5g of magnetic substance in example 1 are weighed respectively and placed in a 2000ml conical flask, water is added to prepare 9% suspension by weight, and the suspension is stirred uniformly.
(2) Adding 175ml of 2% chitosan solution into the suspension obtained in the step (1), stirring for 5 hours at 55 ℃, then performing suction filtration, washing with water, drying at 95 ℃, crushing, and sieving with a 100-mesh sieve to obtain a powdery substance.
(3) And (3) adding 47.5g of the powdery substance obtained in the step (2) into 250ml of 1% polyacrylamide solution, continuously stirring for 5 hours at 55 ℃, then performing centrifugal separation, washing, suction filtration and vacuum drying at 55 ℃ to constant weight, and finally crushing and sieving by a 100-mesh sieve to obtain the powdery composite water treatment agent 2.
(4) Taking 1g of the powdery composite water treatment agent 2 obtained in the step (3), adding 500ml of Pb with the electric conductivity of 3830 mu s/cm2+The pH of the solution was adjusted to 5 in a solution having a concentration of 20mg/L and a concentration of 20mg/L phenol. The solution was shaken on a 25. + -. 1 ℃ constant temperature shaker for 24 hours at a shaking rate of 200 rpm. Determination of Pb by atomic absorption spectrophotometry2+The concentration of the lead-free acid is measured by adopting a 4-aminoantipyrine spectrophotometry method, the conductivity in the water body is measured by adopting a conductivity meter, and the treated Pb is2+The concentration is 1.75mg/L, the phenol concentration is 7.54mg/L, and the composite water treatment agent is used for treating Pb2+The removal rate of (2) was 91.3%, the adsorption capacity was 9.13mg/g, the removal rate of p-phenol was 62.3%, the adsorption capacity was 6.23mg/g, the conductivity was 185. mu.s/cm, and the decrease was 95.2%.
Example 4
(1) 30g of sodium bentonite, 5g of diatomite, 6g of zeolite and 4g of magnetic substance in example 1 are weighed respectively and placed in a 2000ml conical flask, water is added to prepare suspension with the weight concentration of 10%, and the suspension is stirred uniformly.
(2) Adding 300ml of 1% chitosan solution into the suspension obtained in the step (1), stirring for 5 hours at 55 ℃, then performing suction filtration, washing with water, drying at 95 ℃, crushing and sieving with a 100-mesh sieve to obtain a powdery substance.
(3) And (3) adding 48g of the powdery substance obtained in the step (2) into 200ml of 1% polyacrylamide solution, continuously stirring for 4 hours at 50 ℃, then carrying out centrifugal separation, washing, suction filtration and vacuum drying at 55 ℃ to constant weight, and finally crushing and sieving by a 100-mesh sieve to obtain the powdery composite water treatment agent 3.
(4) Taking 1g of the powdery composite water treatment agent 3 obtained in the step (3), adding 500ml of Pb with the electric conductivity of 3830 mu s/cm2+The pH of the solution was adjusted to 7 in a solution having a concentration of 20mg/L and a concentration of 20mg/L phenol. The solution was shaken on a 25. + -. 1 ℃ constant temperature shaker for 24 hours at a shaking rate of 200 rpm. Determination of Pb by atomic absorption spectrophotometry2+The concentration of the lead-free acid is measured by adopting a 4-aminoantipyrine spectrophotometry method, the conductivity in the water body is measured by adopting a conductivity meter, and the treated Pb is2+The concentration is 1.23mg/L, the phenol concentration is 7.21mg/L, and the composite water treatment agent is used for treating Pb2+The removal rate of (2) was 93.9%, the adsorption capacity was 9.39mg/g, the removal rate of p-phenol was 64.0%, the adsorption capacity was 6.40mg/g, the conductivity was 178. mu.s/cm, and the decrease was 95.4%.
Comparative examples
(1) 60g of sodium bentonite, 10g of diatomite, 12g of zeolite, 8g of magnetic substance, 6g of chitosan and 4g of polyacrylamide in example 1 were weighed and mixed to obtain a mixture.
(2) 1g of the mixture obtained in step (1) was added to 500ml of Pb having an electric conductivity of 3830. mu.s/cm2+Phenol concentration of 20mg/L in a solution of 20 mg/L. The pH of the solution was adjusted to 7 and the solution was shaken on a 25. + -. 1 ℃ constant temperature shaker for 24 hours at a shaking rate of 200 rpm. Determination of Pb by atomic absorption spectrophotometry2+The concentration of the phenol is measured by adopting a 4-aminoantipyrine spectrophotometry method, and the conductivity in the water body is measured by adopting a conductivity meter. Wherein the treated solution is Pb2+The concentration is 7.92mg/L, and the composite water treatment agent has the effect of treating Pb2+The removal rate of (A) was 60.4%, and the adsorption capacity was 6.04 mg/g; the phenol concentration of the treated solution was 11.73mg/L, the phenol removal rate of the treatment agent was 41.4%, the adsorption capacity was 4.14mg/g, and the conductivity was 523. mu.s/cm, which was a 86.3% decrease.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The composite water treatment agent is characterized by comprising the following components in parts by weight:
wherein,
the magnetic substance has a specific magnetization coefficient of chi0>12.6×10-8m3Iron oxide compounds with a particle size of less than 100 μm per kg.
2. The composite water treatment agent according to claim 1, characterized in that: the sodium bentonite, the diatomite and the zeolite are purified natural mineral products.
3. The composite water treatment agent according to claim 1, characterized in that: the particle size of the sodium bentonite, the diatomite and the zeolite is 150-200 meshes.
4. The composite water treatment agent according to claim 1, characterized in that: the magnetic substance is gamma-Fe with gaseous state being sol condensation state and dry state being brownish red powder2O3。
5. The composite water treatment agent according to claim 4, wherein: the magnetic substance is separated from the smoke dust discharged by the steel plant by adopting a magnet block with the magnetic field intensity of 1000-1500 Gs.
6. The preparation method of the composite water treatment agent according to any one of claims 1 to 5, characterized by comprising the following specific steps:
(1) mixing 48-70 parts by weight of sodium bentonite, 8-15 parts by weight of diatomite, 8-15 parts by weight of zeolite and 6-10 parts by weight of magnetic substances, and adding water to prepare a suspension with the weight concentration of 8-10%;
(2) adding 5-7 parts by weight of chitosan into water to prepare a chitosan solution with the weight concentration of 1-2%, adding the chitosan solution into the suspension obtained in the step (1), stirring for 4-5 hours at 45-55 ℃, cooling to room temperature, washing with water, performing suction filtration, drying, crushing and sieving to obtain a powdery substance;
(3) adding 3-5 parts by weight of polyacrylamide into water to prepare a 1-2% polyacrylamide solution, adding the powdery substance obtained in the step (2) into the polyacrylamide solution, stirring for 4-5 hours at 50-55 ℃, cooling to room temperature, performing centrifugal separation, water washing, suction filtration, vacuum drying to constant weight, and finally crushing and sieving to obtain the powdery composite water treatment agent.
7. The method for producing a composite water treatment agent according to claim 6, characterized in that: in the step (2), the drying temperature is 95 ℃;
in the step (3), the temperature of vacuum drying is 55 ℃.
8. The method for producing a composite water treatment agent according to claim 6, characterized in that: in the step (2) and the step (3), the sieving is carried out by a sieve with a sieve opening of 100 meshes;
in the step (3), the centrifugation is performed at the rotating speed of 1500 r/min.
9. The use of the composite water treatment agent according to any one of claims 1 to 5 for removing suspended particles, heavy metals or organic pollutants in water.
10. Use of the composite water treatment agent according to claim 9 as an adsorbent in a pretreatment stage of a reverse osmosis membrane system.
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| CN104903252A (en) * | 2013-04-18 | 2015-09-09 | 北京东方协和医药生物技术有限公司 | A composition for treating waste water |
| CN104998621A (en) * | 2015-07-10 | 2015-10-28 | 常州市南飞机械有限公司 | Chitosan-coated groundwater remediation agent with soil heavy metal adsorption function and preparation method therefor |
| CN105107469A (en) * | 2015-08-07 | 2015-12-02 | 中国人民解放军海军医学研究所 | Magnetic composite for removing cesium ions in radioactive wastewater and preparation method therefor |
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| CN106006790A (en) * | 2016-07-14 | 2016-10-12 | 慎叶 | Novel rainwater treatment purifying agent |
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