CN112811538A - Method for adding and recovering magnetic powder in sewage treatment - Google Patents
Method for adding and recovering magnetic powder in sewage treatment Download PDFInfo
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- CN112811538A CN112811538A CN202110010602.5A CN202110010602A CN112811538A CN 112811538 A CN112811538 A CN 112811538A CN 202110010602 A CN202110010602 A CN 202110010602A CN 112811538 A CN112811538 A CN 112811538A
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- Prior art keywords
- magnetic powder
- sewage treatment
- recovering
- flocs
- sewage
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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
Abstract
The invention discloses a method for adding and recovering magnetic powder in sewage treatment, which specifically comprises the following steps: (1) selecting Fe3O4、CrO2Mixing the sintered Nb-Fe-B magnetic powder with the sintered Nb-Fe-B magnetic powder to obtain mixed magnetic powder; (2) adding a coagulant, mixed magnetic powder, PAC and PAM into the sewage in sequence, and uniformly stirring to form flocculent magnetic flocs; (3) after the flocculated sewage is settled and filtered in a settling pond, separating flocs with magnetic powder from a waste sludge pipeline under the action of a reflux pump, adding water, stirring at a high speed to dissolve and disperse the flocs, separating the magnetic powder by using a magnetic powder separator, and discharging the sludge; (4) and (4) performing secondary recovery on the discharged sludge by adopting an electromagnetic recoverer. The invention relates to the technical field of sewage treatment, and particularly provides a method for adding and recovering sewage treatment magnetic powder, which is good in flocculation effect and high in recovery rate.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for adding and recovering magnetic powder in sewage treatment.
Background
In recent years, a plurality of sewage treatment plants need to be improved in standard, the sewage treatment plants reach higher discharge standards, the magnetic coagulation process is the best standard improvement and improvement process, total phosphorus and SS can be efficiently removed at the same time, a flocculating agent and magnetic powder (ferroferric oxide powder) are added in the magnetic coagulation process, and then pollutants are separated from a water body in a flocculation mode. The magnetic powder is the core component of the magnetic coagulation process due to high specific gravity, and in order to save cost, the added magnetic powder needs to be recovered and recycled.
At present, in the processes of adding and recovering magnetic powder and each application project, the mode of each application project is provided, the magnetic powder adding is manual adding and uneven stirring with sewage, the magnetic powder recovering is realized by adopting a magnetic separator, but the recovery efficiency of many magnetic separators is not high, the magnetic powder is wasted, and due to the fact that the specific gravity of the magnetic powder is high, the manual adding cannot be continuous and the labor intensity is high.
Disclosure of Invention
Aiming at the situation, in order to overcome the current technical defects, the invention provides a method for adding and recovering sewage treatment magnetic powder, which has the advantages of good flocculation effect and high recovery rate.
The technical scheme adopted by the invention is as follows: the method for adding and recovering the magnetic powder for sewage treatment specifically comprises the following steps:
(1) selecting Fe3O4、CrO2Mixing the sintered Nb-Fe-B magnetic powder with the sintered Nb-Fe-B magnetic powder to obtain mixed magnetic powder;
(2) adding a coagulant, mixed magnetic powder, PAC (polyaluminium chloride) and PAM (polyacrylamide) into the sewage in sequence by adopting an automatic magnet adding machine, and uniformly stirring to form flocculent magnetic flocs;
(3) after the flocculated sewage is settled and filtered in a settling pond, separating flocs with magnetic powder from a waste sludge pipeline under the action of a reflux pump, adding water, stirring at a high speed to dissolve and disperse the flocs, separating the magnetic powder by using a magnetic powder separator, and discharging the sludge;
(4) and (4) carrying out secondary recovery on the magnetic powder in the discharged sludge by adopting an electromagnetic recoverer.
Further, Fe described in step (1)3O4、CrO2And the mass ratio of the sintered Nb-Fe-B magnetic powder is (5-7) to (2-3) to (1-2).
Further, the addition amount of the mixed magnetic powder is 25 mg/L.
Further, the adding mode of the mixed magnetic powder in the step (2) is a batch adding method, the mixed magnetic powder is added in three batches, and 1/3 amount of the mixed magnetic powder is added at intervals of half an hour in the stirring process, so that the problem of uneven adding of the magnetic powder is solved.
Further, the stirring speed in the step (2) is 1000-1500 r/min.
Further, the high-speed stirring speed in the step (3) is 3500-5000 r/min.
The invention with the structure has the following beneficial effects: according to the sewage treatment magnetic powder feeding and recycling method, an automatic mechanical feeding mode is adopted to improve the efficiency and reduce the labor cost, meanwhile, the magnetic powder recycling adopts secondary recycling, and an electromagnet is added as a secondary recycling mode, so that the recycling rate of 99.9% can be realized.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the technical scheme adopted by the invention is as follows: the method for adding and recovering the magnetic powder for sewage treatment specifically comprises the following steps:
(1) selecting Fe3O4、CrO2Mixing the sintered Nb-Fe-B magnetic powder with the sintered Nb-Fe-B magnetic powder to obtain mixed magnetic powder;
(2) adding a coagulant, mixed magnetic powder, PAC (polyaluminium chloride) and PAM (polyacrylamide) into the sewage in sequence by adopting an automatic magnet adding machine, and uniformly stirring to form flocculent magnetic flocs;
(3) after the flocculated sewage is settled and filtered in a settling pond, separating flocs with magnetic powder from a waste sludge pipeline under the action of a reflux pump, adding water, stirring at a high speed to dissolve and disperse the flocs, separating the magnetic powder by using a magnetic powder separator, and discharging the sludge;
(4) and (4) carrying out secondary recovery on the magnetic powder in the discharged sludge by adopting an electromagnetic recoverer.
Wherein, Fe described in step (1)3O4、CrO2And the mass ratio of the sintered Nb-Fe-B magnetic powder is 5:2: 1.
The addition amount of the mixed magnetic powder is 25 mg/L.
The adding mode of the mixed magnetic powder in the step (2) is a batch adding method, the mixed magnetic powder is added in three batches, and 1/3 amounts of the mixed magnetic powder is added at intervals of half an hour in the stirring process, so that the problem of uneven adding of the magnetic powder is solved.
And (3) the stirring speed in the step (2) is 1000-1500 r/min.
And (3) the high-speed stirring rotating speed is 3500-5000 r/min.
Example 2:
the technical scheme adopted by the invention is as follows: the method for adding and recovering the magnetic powder for sewage treatment specifically comprises the following steps:
(1) selecting Fe3O4、CrO2Mixing the sintered Nb-Fe-B magnetic powder with the sintered Nb-Fe-B magnetic powder to obtain mixed magnetic powder;
(2) adding a coagulant, mixed magnetic powder, PAC (polyaluminium chloride) and PAM (polyacrylamide) into the sewage in sequence by adopting an automatic magnet adding machine, and uniformly stirring to form flocculent magnetic flocs;
(3) after the flocculated sewage is settled and filtered in a settling pond, separating flocs with magnetic powder from a waste sludge pipeline under the action of a reflux pump, adding water, stirring at a high speed to dissolve and disperse the flocs, separating the magnetic powder by using a magnetic powder separator, and discharging the sludge;
(4) and (4) carrying out secondary recovery on the magnetic powder in the discharged sludge by adopting an electromagnetic recoverer.
Wherein, Fe described in step (1)3O4、CrO2And the mass ratio of the sintered Nb-Fe-B magnetic powder is 7:3: 2.
The addition amount of the mixed magnetic powder is 25 mg/L.
The adding mode of the mixed magnetic powder in the step (2) is a batch adding method, the mixed magnetic powder is added in three batches, and 1/3 amounts of the mixed magnetic powder is added at intervals of half an hour in the stirring process, so that the problem of uneven adding of the magnetic powder is solved.
And (3) the stirring speed in the step (2) is 1000-1500 r/min.
And (3) the high-speed stirring rotating speed is 3500-5000 r/min.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The method for adding and recovering the magnetic powder in sewage treatment is characterized by comprising the following steps:
(1) selecting Fe3O4、CrO2Mixing the sintered Nb-Fe-B magnetic powder with the sintered Nb-Fe-B magnetic powder to obtain mixed magnetic powder;
(2) adding a coagulant, mixed magnetic powder, PAC (polyaluminium chloride) and PAM (polyacrylamide) into the sewage in sequence by adopting an automatic magnet adding machine, and uniformly stirring to form flocculent magnetic flocs;
(3) after the flocculated sewage is settled and filtered in a settling pond, separating flocs with magnetic powder from a waste sludge pipeline under the action of a reflux pump, adding water, stirring at a high speed to dissolve and disperse the flocs, separating the magnetic powder by using a magnetic powder separator, and discharging the sludge;
(4) and (4) carrying out secondary recovery on the magnetic powder in the discharged sludge by adopting an electromagnetic recoverer.
2. The method for adding and recovering sewage treatment magnetic powder according to claim 1, wherein the Fe in step (1)3O4、CrO2And the mass ratio of the sintered Nb-Fe-B magnetic powder is (5-7) to (2-3) to (1-2).
3. The method for adding and recovering magnetic powder for sewage treatment according to claim 2, wherein the amount of the mixed magnetic powder is 25 mg/L.
4. The method for adding and recovering the magnetic powder for sewage treatment according to claim 1, wherein the mixed magnetic powder in the step (2) is added in a batch method, the mixed magnetic powder is added in three batches, and 1/3 amounts of the mixed magnetic powder are added at intervals of half an hour in the stirring process.
5. The method for adding and recovering the sewage treatment magnetic powder according to claim 1, wherein the stirring speed in the step (2) is 1000-1500 r/min.
6. The method for adding and recovering magnetic powder for sewage treatment according to claim 1, wherein the high-speed stirring speed in the step (3) is 3500-5000 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010602.5A CN112811538A (en) | 2021-01-06 | 2021-01-06 | Method for adding and recovering magnetic powder in sewage treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110010602.5A CN112811538A (en) | 2021-01-06 | 2021-01-06 | Method for adding and recovering magnetic powder in sewage treatment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226799A (en) * | 2006-11-21 | 2008-07-23 | 株式会社日立制作所 | Rare earth element magnet |
| CN101337724A (en) * | 2008-08-22 | 2009-01-07 | 四川德美环境技术有限责任公司 | Magnetic powder recovering and supplying method in water processing process |
| US20090206040A1 (en) * | 2008-02-14 | 2009-08-20 | Berg Michael C | Systems and methods for removing finely dispersed particulate matter from a fluid stream |
| CN110386714A (en) * | 2019-08-13 | 2019-10-29 | 青岛思普润水处理股份有限公司 | A kind of magnetic powder load is super to imitate separation waste water treatment system and treatment process |
| CN211311213U (en) * | 2019-11-22 | 2020-08-21 | 北京新林水务科技有限公司 | Novel magnetic coagulation device |
-
2021
- 2021-01-06 CN CN202110010602.5A patent/CN112811538A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226799A (en) * | 2006-11-21 | 2008-07-23 | 株式会社日立制作所 | Rare earth element magnet |
| US20090206040A1 (en) * | 2008-02-14 | 2009-08-20 | Berg Michael C | Systems and methods for removing finely dispersed particulate matter from a fluid stream |
| CN101337724A (en) * | 2008-08-22 | 2009-01-07 | 四川德美环境技术有限责任公司 | Magnetic powder recovering and supplying method in water processing process |
| CN110386714A (en) * | 2019-08-13 | 2019-10-29 | 青岛思普润水处理股份有限公司 | A kind of magnetic powder load is super to imitate separation waste water treatment system and treatment process |
| CN211311213U (en) * | 2019-11-22 | 2020-08-21 | 北京新林水务科技有限公司 | Novel magnetic coagulation device |
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Application publication date: 20210518 |
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