CN111592084A - Magnetic powder modified polyferric chloride coagulant and preparation method thereof - Google Patents
Magnetic powder modified polyferric chloride coagulant and preparation method thereof Download PDFInfo
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- CN111592084A CN111592084A CN202010489034.7A CN202010489034A CN111592084A CN 111592084 A CN111592084 A CN 111592084A CN 202010489034 A CN202010489034 A CN 202010489034A CN 111592084 A CN111592084 A CN 111592084A
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- magnetic powder
- polyferric chloride
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
Abstract
The invention discloses a magnetic powder modified polyferric chloride coagulant and a preparation method thereof, wherein the magnetic powder modified polyferric chloride coagulant comprises the following raw materials: nano magnetic Fe3O4Powder, a polyferric chloride solution, a polyacrylamide solution and an ethylene diamine tetraacetic acid solution. The coagulant has the advantages of excellent sewage treatment effect, stable performance, convenient use and recyclability. The invention also discloses a preparation method of the magnetic powder modified polyferric chloride coagulant.
Description
Technical Field
The invention relates to the field of water purification, and particularly relates to a magnetic powder modified polyferric chloride coagulant and a preparation method thereof.
Background
At present, the water quality of most water areas in the world generally shows a deterioration trend, the water environment deterioration becomes a considerable important problem, and the direct discharge of urban sewage is an important cause of water pollution, so that the treatment of urban sewage is increasingly concerned by people. Compared with the traditional biological treatment, the method has the characteristics of less natural condition restriction, less occupied land, short flow, high treatment speed, low capital construction and operation cost, flexible operation and the like, thereby becoming an extremely competitive urban sewage treatment method.
Destabilization, agglomeration and separation of fine particulate matter and contaminants occur almost simultaneously during coagulation. In the previous researches, in consideration of the advantages of strong electric neutralization, adsorption and sweeping, bridging and net-capturing capacity, rapid reaction and the like of inorganic polymer coagulants, a great deal of researches are devoted to the research of the coagulants, such as polymeric aluminum, iron, silicon and compound products thereof, and the discussion of coagulation mechanisms.
The magnetic coagulant is produced by considering the requirements of the water treatment process on adsorption flocculation and the charge characteristics of iron oxide in an aqueous solution system, and is basically characterized in that the traditional high-efficiency coagulant is compounded with magnetic particles to obtain a magnetic coagulant system. The sewage is treated by adopting the magnetic coagulation process, so that the method is simple, rapid, economic and effective, can realize rapid separation and rapid sedimentation, and has obvious advantages and unique performance in the aspects of land occupation, energy consumption, operation, sludge dewatering performance and the like compared with the traditional separation technology.
Magnetic coagulant systems mostly exist in a solid-liquid mixed state, but are not homogeneous systems, and at the present stage, researches on the magnetic coagulant systems mainly focus on the water purification effect of the magnetic coagulant systems, and researches on the uniformity and the stability of the magnetic coagulant systems are rarely reported. The high specific surface area and the strong magnetic attraction of the magnetic nano-particles lead the magnetic nano-particles to tend to agglomerate in a compound system and cannot be stably dispersed. How to effectively compound ferromagnetic particles and a common inorganic coagulant to obtain a uniformly dispersed and stable-performance magnetic coagulant system is a problem to be solved urgently in the research of magnetic coagulants.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a magnetic powder modified polyferric chloride coagulant which has the advantages of excellent sewage treatment effect, stable performance, convenient use and recyclability. The invention also discloses a preparation method of the magnetic powder modified polyferric chloride coagulant.
The invention is realized by the following technical scheme:
the magnetic powder modified polyferric chloride coagulant comprises the following raw materials: nano magnetic Fe3O4Powder, a polyferric chloride solution, a polyacrylamide solution and an ethylene diamine tetraacetic acid solution.
Wherein, the sodiumMagnetic Fe of rice3O4The particle size of the powder is about 30-70 nm.
A preparation method of a magnetic powder modified polyferric chloride coagulant comprises the following steps:
(1) pouring the poly ferric chloride solution into a container, and adding the nano magnetic Fe3O4Uniformly stirring the powder, wherein the mass ratio of the magnetic powder to the ferric chloride is 2: 1-3: 1;
(2) adding a polyacrylamide solution into the solution obtained in the step (1), uniformly stirring, adding an ethylene diamine tetraacetic acid solution, and uniformly mixing;
(3) and (3) standing and precipitating the mixed solution obtained in the step (2), removing supernatant, cleaning and precipitating, and drying to obtain the magnetic powder modified polyferric chloride coagulant.
Wherein in the step (1), the stirring temperature is 25 ℃, the stirring time is 30min, and the stirring speed is 120 rpm.
Further, in the step (2), the stirring temperature after adding the polyacrylamide solution is 25 ℃, the stirring time is 30min, the stirring speed is 100rpm, the stirring temperature after adding the disodium ethylene diamine tetraacetate solution is 40 ℃, the stirring time is 60min, and the stirring speed is 100 rpm.
Further, in the step (3), the precipitation time is 8h, and the precipitation cleaning mode is as follows: washing with anhydrous ethanol for 3 times.
Further, in the step (3), the drying temperature is 80 ℃.
The concentration of the polyferric chloride solution is 10g/L, the concentration of the polyacrylamide solution is 10g/L, the concentration of the disodium ethylene diamine tetraacetate solution is 10g/L, and the concentration of the prepared magnetic powder modified polyferric chloride coagulant mixed solution is 60-90 mg/L.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the magnetic powder modified polyferric chloride coagulant, the polyacrylamide solution added into the raw materials plays a role in adsorption and bridging, so that micro-flocs are promoted to form larger flocs, the precipitation rate is increased, and the pollutant removal efficiency is improved;
2. the invention relates to a magnetic powder modified polyferric chloride coagulantThe disodium ethylene diamine tetraacetate solution added into the raw materials is used as a stabilizer and can promote the nanometer magnetic Fe3O4The powder, ferric chloride and polyacrylamide are better combined together, and when water is added to prepare a solution, the product can be more uniformly dispersed in the water, so that the agglomeration phenomenon is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
The invention relates to a magnetic powder modified polyferric chloride coagulant, which is prepared by the following process steps:
1) preparing a polyferric chloride solution with the concentration of 10 g/L;
2) preparing a polyacrylamide solution by using an ultrasonic and stirring method, wherein the concentration of the solution is 10 g/L;
3) preparing EDTA-2Na solution with the concentration of 10 g/L;
4) pouring 100mL of 10g/L polyferric chloride solution into a conical flask, and adding 2g of nano magnetic Fe3O4Powder, the mass ratio of the magnetic powder to the ferric chloride is 2:1, stirring is carried out for 30min at the temperature of 25 ℃, and the stirring speed is 120 rpm;
5) on the basis of the step 4), taking 10mL of polyacrylamide solution with the concentration of 10g/L, adding the polyacrylamide solution into a conical flask, and stirring for 30min at the temperature of 25 ℃ at the stirring speed of 100 rpm;
6) on the basis of the step 5), adding 10mL of EDTA-2Na solution with the concentration of 10g/L into an erlenmeyer flask, and stirring for 1h at the temperature of 40 ℃ and the stirring speed of 100 rpm;
7) standing the mixed solution for 8h, removing supernatant, and washing with anhydrous ethanol for 3 times;
8) and (3) placing the cleaned substance in an oven, and drying at 80 ℃ to obtain a product, namely the magnetic powder modified polyferric chloride coagulant.
The magnetic coagulant prepared by the embodiment is used for a high-efficiency sedimentation tank process unit in three-stage treatment of a sewage plant. The adding amount of the magnetic coagulant is 60mg/L, and after coagulation, flocculation and precipitation processes, the water inlet, outlet and treatment effects of the high-efficiency sedimentation tank are shown in the following table:
the common coagulant adopts the commercial polyferric oxide coagulant, and compared with the treatment effect of a high-efficiency sedimentation tank, the coagulant can treat CODCrAnd in the aspects of treatment of turbidity and TP, the magnetic coagulant is superior to the common coagulant.
Example 2
The invention relates to a magnetic powder modified polyferric chloride coagulant, which is prepared by the following process steps:
1) preparing a polyferric chloride solution with the concentration of 10 g/L;
2) preparing a polyacrylamide solution by using an ultrasonic and stirring method, wherein the concentration of the solution is 10 g/L;
3) preparing EDTA-2Na solution with the concentration of 10 g/L;
4) pouring 100mL of 10g/L polyferric chloride solution into a conical flask, and adding 3g of nano magnetic Fe3O4Powder, the mass ratio of the magnetic powder to the ferric chloride is 3:1, stirring is carried out for 30min at the temperature of 25 ℃, and the stirring speed is 120 rpm;
5) on the basis of the step 4), adding 20mL of polyacrylamide solution with the concentration of 10g/L into a conical flask, and stirring for 30min at the temperature of 25 ℃ at the stirring speed of 100 rpm;
6) on the basis of the step 5), adding 20mL of EDTA-2Na solution with the concentration of 10g/L into an erlenmeyer flask, and stirring at the temperature of 40 ℃ for 1h at the stirring speed of 100 rpm;
7) standing the mixed solution for 8h, removing supernatant, and washing with anhydrous ethanol for 3 times;
8) and (3) placing the cleaned substance in an oven, and drying at 80 ℃ to obtain a product, namely the magnetic powder modified polyferric chloride coagulant.
The magnetic coagulant prepared by the embodiment is used for a high-efficiency sedimentation tank process unit in three-stage treatment of a sewage plant. The adding amount of the magnetic coagulant is 60mg/L, and after coagulation, flocculation and precipitation processes, the water inlet, outlet and treatment effects of the high-efficiency sedimentation tank are shown in the following table:
the common coagulant adopts the commercial polyferric oxide coagulant, and compared with the treatment effect of a high-efficiency sedimentation tank, the coagulant can treat CODCrAnd in the aspects of treatment of turbidity and TP, the magnetic coagulant is superior to the common coagulant.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The magnetic powder modified polyferric chloride coagulant is characterized by comprising the following raw materials: nano magnetic Fe3O4Powder, a polyferric chloride solution, a polyacrylamide solution and an ethylene diamine tetraacetic acid solution.
2. The magnetic powder modified polyferric chloride coagulant according to claim 1, characterized in that the nano-magnetic Fe is3O4The particle size of the powder is 30-70 nm.
3. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 1 or 2, characterized by comprising the following steps:
(1) pouring the poly ferric chloride solution into a container, and adding the nano magnetic Fe3O4Uniformly stirring the powder, wherein the mass ratio of the magnetic powder to the ferric chloride is 2: 1-3: 1;
(2) adding a polyacrylamide solution into the solution obtained in the step (1), uniformly stirring, adding an ethylene diamine tetraacetic acid solution, and uniformly mixing;
(3) and (3) standing and precipitating the mixed solution obtained in the step (2), removing supernatant, cleaning and precipitating, and drying to obtain the magnetic powder modified polyferric chloride coagulant.
4. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 3, characterized in that in the step (1), the stirring temperature is 25 ℃, the stirring time is 30min, and the stirring speed is 120 rpm.
5. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 3, characterized in that in the step (2), the stirring temperature after adding the polyacrylamide solution is 25 ℃, the stirring time is 30min, the stirring speed is 100rpm, the stirring temperature after adding the disodium ethylene diamine tetraacetate solution is 40 ℃, the stirring time is 60min, and the stirring speed is 100 rpm.
6. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 3, characterized in that in the step (3), the precipitation time is 8 hours, and the precipitation cleaning mode is as follows: washing with anhydrous ethanol for 3 times.
7. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 3, characterized in that in the step (3), the drying temperature is 80 ℃.
8. The method for preparing a magnetic powder modified polyferric chloride coagulant according to claim 3, characterized in that the concentration of the polyferric chloride solution is 10g/L, the concentration of the polyacrylamide solution is 10g/L, the concentration of the disodium ethylenediaminetetraacetate solution is 10g/L, and the concentration of the prepared magnetic powder modified polyferric chloride coagulant mixed solution in the step (3) is 60-90 mg/L.
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| CN202010489034.7A CN111592084A (en) | 2020-06-02 | 2020-06-02 | Magnetic powder modified polyferric chloride coagulant and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981593A (en) * | 1986-09-16 | 1991-01-01 | Commonwealth Scientific And Industrial Research Organisation | Sewage treatment |
| CN1994908A (en) * | 2006-11-29 | 2007-07-11 | 天津化工研究设计院 | Water processing method combining complete set coagulant reagent and matched apparatus |
| CN102627342A (en) * | 2012-04-19 | 2012-08-08 | 宁夏兴平精细化工股份有限公司 | Magnetic powder flocculating agent and application method thereof |
| CN104291426A (en) * | 2014-11-06 | 2015-01-21 | 天津工业大学 | High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment |
| CN105217695A (en) * | 2015-08-28 | 2016-01-06 | 南京大学 | The methods and applications of a kind of novel magnetic nano magnetic kind and process industrial biochemistry tail water thereof |
| CN107522386A (en) * | 2017-08-23 | 2017-12-29 | 南京中衡元环保科技有限公司 | A kind of composite flocculation agent, its preparation method and application |
-
2020
- 2020-06-02 CN CN202010489034.7A patent/CN111592084A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4981593A (en) * | 1986-09-16 | 1991-01-01 | Commonwealth Scientific And Industrial Research Organisation | Sewage treatment |
| CN1994908A (en) * | 2006-11-29 | 2007-07-11 | 天津化工研究设计院 | Water processing method combining complete set coagulant reagent and matched apparatus |
| CN102627342A (en) * | 2012-04-19 | 2012-08-08 | 宁夏兴平精细化工股份有限公司 | Magnetic powder flocculating agent and application method thereof |
| CN104291426A (en) * | 2014-11-06 | 2015-01-21 | 天津工业大学 | High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment |
| CN105217695A (en) * | 2015-08-28 | 2016-01-06 | 南京大学 | The methods and applications of a kind of novel magnetic nano magnetic kind and process industrial biochemistry tail water thereof |
| CN107522386A (en) * | 2017-08-23 | 2017-12-29 | 南京中衡元环保科技有限公司 | A kind of composite flocculation agent, its preparation method and application |
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Application publication date: 20200828 |