CN104291426A - High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment - Google Patents
High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment Download PDFInfo
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- CN104291426A CN104291426A CN201410630811.XA CN201410630811A CN104291426A CN 104291426 A CN104291426 A CN 104291426A CN 201410630811 A CN201410630811 A CN 201410630811A CN 104291426 A CN104291426 A CN 104291426A
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- China
- Prior art keywords
- magnetic
- flocculating agent
- agent
- magnetic powder
- seawater
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a high-efficiency magnetic flocculating agent applied to seawater desalination pretreatment. The agent uses iron powder and Fe3O4 (ferriferrous oxide) as magnetic powder, and uses FeCl3.6H2O (ferric chloride hexahydrate) as a coagulate flocculating agent, wherein the concentration of the Fe3O4 (ferriferrous oxide) is 5-8mg/L, the concentration of the coagulate flocculating agent FeCI3.6H2O is 19-21mg/L. The high-efficiency magnetic flocculating agent is prepared through the following steps: after thoroughly mixing the magnetic powder, putting the mixed magnetic powder into a beaker, adding an appropriate amount of distilled water to the mixed magnetic powder, leaving the mixture of the mixed magnetic powder and the distilled water to stand in a magnetic field, turning on a power supply to magnetize the magnetic powder for 3-10min, and mixing the coagulate flocculating agent and the magnetized magnetic powder as the high-efficiency magnetic flocculating agent which is applied to seawater desalination pretreatment. The magnetic powder and floc bodies of the coagulate flocculating agent can be utilized to form close-grained 'magnetic composite bodies', so that the interattraction force between the magnetic particles is increased, the combining capacity of the coagulate flocculating agent to pollutants in the seawater is significantly improved, the bigger floc bodies are agglomerated, the sedimentation is faster, and the precipitating effect is greater; and the consumption of the coagulate flocculating agent can be reduced, and the magnetic powder can also be recovered and reused. The preparation method for the high-efficiency magnetic flocculating agent has the advantages that the technology is simple, the cost is low, and the agent has a favorable application prospect in the field of seawater desalination pretreatment.
Description
Technical field
The present invention designs a kind of efficient magnetic flocculation agent being applied to seawater desalinization pretreatment, belongs to environment, field of functional materials.
Background technology
Sea water desaltination is the process to sea water desalinization process for producing fresh water.The pre-treatment of seawater is exactly to " preliminary treatment " that seawater carries out before seawater utilizes further.Pretreated object is that the silt in seawater, suspended substance, colloid, microorganism, organism, gas dissolved etc. can be produced the material removing of deleterious effect to next step seawater utilization technique or be reduced to a certain degree, makes it to meet the requirement of next step technique to seawater quality.
The pretreatment process reported in this technical field mainly comprises conventional pre-treatment and membrane pretreatment.Conventional pre-treatment comprises chlorination or clorox sterilization algae removal; Coagulation, precipitation (clarification), filtration remove suspended impurity, colloidalmaterial etc.; Add acid for adjusting pH value and add Scale inhibitors in case the fouling precipitation of blocking hydrochlorate and vitriol; When organic content is higher, chlorination, coagulation, clarification, filtration process can be taked, or adopt activated carbon filtration process simultaneously; Also to add reductive agent or gac removal pretreatment system outlet chlorine residue in addition; For oil pollution in seawater, air flotation pool oil removing need be adopted.In order to ensure the more reliable and stable operation of system, before entering reverse osmosis system, also will cartridge filter be set.Conventional pretreatment process runs relatively reliable, and technology maturation, but floor space is large.Membrane pretreatment mainly comprise there is selective separation function micro-filtration (MF), ultrafiltration (UF) and nanofiltration (NF) three kinds and with its device being core, process, technique integrated.Membrane pretreatment has without phase transformation, and low power consuming, efficiency is high, it is little to pollute, and technique is simple, easy and simple to handle, is convenient to other technologies integrated, pre-treatment effluent quality advantages of higher; But it is nearly unavailable to the oxygen-bearing organic matter that molecular mass is relatively low, simultaneously due to film vulnerable to pollution, cause transmitance decay, film damage and the problem such as salinity deposition and film fouling, therefore operation stability is poorer than traditional technology, and have strict demand to former water, also regularly will carry out matting, working cost is high, there is film and blocks and membrane pollution problem.
In sum, conventional pre-treatment and membrane pretreatment technology each has something to recommend him.Conventional pretreatment process runs relatively reliable, technology maturation, but floor space is large.Embrane method process floor space is little, and effluent quality is excellent, but run stability comparatively traditional technology is poor, working cost is high.
Magnetic flocculation technology is by loading magnetic the dosing coagulant while, extra large water pollutant, magnetic, coagulating agent are combined as a whole, form the magnetic complex body of band, then by magnetic separating device or the rapid subsidence of self, realize solid-liquid separation, thus by pollutant removal.Chen Yu etc. with to the removal effect of COD, turbidity, TP, ammonia nitrogen for inspection target, magnetic flocculation experimental study is carried out to city domestic sewage, find that the effect of magnetic flocculation process city domestic sewage is better than traditional coagulation, flocculation and settling time can not only be shortened, reduce flco volume, and be easier to realize solid-liquid Magneto separate [Chinese water supply and drainage .2011,27 (17): 78-81].Li Jixiang etc. have investigated conventional coagulation and have loaded magnetic-coagulation technique to the removal effect of the pollutents such as COD, turbidity and TP in micropolluted river water, result shows, the volume average particle size loading magnetic kind postprecipitation particle is significantly be increased to 68.6 μm from 50.1 μm of conventional coagulation process; Pollutant removal is obviously better than conventional coagulation process, especially obtains significant lifting [environmental engineering journal .2014,8 (7): 2901-2905] to the removal effect of turbidity and total phosphorus.Load magnetic and significantly can improve coagulation effect, this is mainly due to after loading magnetic, and magnetic and coagulating agent flco can be formed closely knit " magnetic compound ", mutual attractive force between these magnetic-particles increases, can be condensed into larger flco, sedimentation is faster, and sedimentation effect is better.Magnetic has ion polarity and metallic character, significantly can strengthen the binding ability of coagulating agent to extra large water pollutant, and reduce the consumption of coagulating agent, magnetic is recyclable use more also, and running cost is low.In addition, magnetic flocculation technique also have that floor space is little, hydraulic load is high, save added amount of chemical, produce water water quality good, start the advantages such as fast.
Adopt magnetic flocculation technology to carry out pre-treatment to seawater, the selection of magnetic and coagulating agent is crucial.The present invention designs a kind of efficient magnetic flocculation agent being applied to seawater desalinization pretreatment of preparation, and this magnetic flocculation agent is with iron powder and Fe
3o
4for magnetic, with FeCl
36H
2o is coagulating agent, wherein Fe
3o
4concentration be 5-8mg/L, coagulating agent FeCl
36H
2the concentration of O is 19-21mg/L.This efficient magnetic flocculation agent compounding method technique is simple, and cost is low, has good application prospect in seawater desalinization pretreatment field.
Summary of the invention
For the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is that sea water desaltination conventional pre-treatment floor space is large, in the not high and membrane pretreatment of water quality, operation stability is poor after process, costly, film the problem such as easily to pollute.
The present invention solves that described sea water desaltination conventional pre-treatment floor space is large, in the not high and membrane pretreatment of water quality, operation stability is poor after process, costly, the technical scheme of the problem such as fouling membrane prepares a kind of efficient magnetic flocculation agent being applied to seawater desalinization pretreatment.
The invention provides a kind of compound method being applied to the efficient magnetic flocculation agent of seawater desalinization pretreatment, input amount during this efficient magnetic flocculation agent process seawater is 1L seawater: 37 ~ 43mg, and wherein the mass ratio of coagulating agent and magnetic is 4 ~ 7.It is characterized in that comprising the following steps:
A) appropriate FeCl is taken
36H
2o is as coagulating agent.
B) appropriate Fe is taken
3o
4with iron powder as magnetic.
C) put into beaker after fully being mixed by magnetic, add appropriate distilled water, be then statically placed in magnetic field, magnetizing time is 3-10min.
D) coagulating agent step a) taken and step c) magnetization after magnetic mixing as a kind of efficient magnetic flocculation agent being applied to seawater desalinization pretreatment.
Embodiment
Introduce specific embodiments of the invention below, but the present invention is not by the restriction of embodiment.
Embodiment 1.
For Tianjin seawater, the turbidity testing former water is 151NTU, and temperature is 18 DEG C.Six coagulation stirrer simulation precipitation process of coagulation are adopted in test, with 200r/min rapid stirring 1min, 60r/min low rate mixing 15min, gets supernatant liquor after leaving standstill 20min and measures its turbidity, be determined at the delivery turbidity under different magnetic flocculation agent proportioning, test-results is in table 1.
Delivery turbidity under table 1 different magnetic flocculation agent proportioning
As shown in Table 1, a dosing coagulant FeCl
3time, when its concentration is 25mg/L, delivery turbidity is minimum, the highest to the clearance of turbidity; But dosing coagulant FeCl
3add magnetic Fe simultaneously
3o
4time, when concentration is 20mg/L, delivery turbidity is minimum is 0.39NTU, and when being 25mg/L than dosage, clearance is higher.Test-results shows, a kind of efficient magnetic flocculation agent for seawater desalinization pretreatment is remarkable to turbidity of sea water removal effect, can reduce dosage of PAC, and suitably the proportioning of adjustment coagulating agent and magnetic can obtain desirable result.
Claims (4)
1. be applied to an efficient magnetic flocculation agent for seawater desalinization pretreatment, it is characterized in that this magnetic flocculation agent is with FeCl
36H
2o is coagulating agent, with iron powder and Fe
3o
4for magnetic, and magnetic is magnetized, utilize magnetic and coagulating agent flco can be formed closely knit " magnetic compound ", the mutual attractive force between these magnetic-particles is increased.
2. be applied to the efficient magnetic flocculation agent of seawater desalinization pretreatment as claimed in claim 1, it is characterized in that the proportioning of coagulating agent and magnetic, the magnetizing time of magnetic.
3. be applied to the efficient magnetic flocculation agent of seawater desalinization pretreatment as claimed in claim 1, input amount during described efficient magnetic flocculation agent process seawater is 1L seawater: 37 ~ 43mg, and wherein the mass ratio of coagulating agent and magnetic is 4 ~ 7.
4. the preparation method of efficient magnetic flocculation agent according to claim 1, is characterized in that comprising the following steps:
A) appropriate FeCl is taken
36H
2o is as coagulating agent.
B) appropriate Fe is taken
3o
4with iron powder as magnetic.
C) put into beaker after fully being mixed by magnetic, add appropriate distilled water, be then statically placed in magnetic field, magnetizing time is 3-10min.
D) coagulating agent step a) taken and step c) magnetization after magnetic mixing as a kind of efficient magnetic flocculation agent being applied to seawater desalinization pretreatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410630811.XA CN104291426A (en) | 2014-11-06 | 2014-11-06 | High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410630811.XA CN104291426A (en) | 2014-11-06 | 2014-11-06 | High-efficiency magnetic flocculating agent applied to seawater desalination pretreatment |
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|---|---|
| CN104291426A true CN104291426A (en) | 2015-01-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152298A (en) * | 2015-10-21 | 2015-12-16 | 华东交通大学 | Preparation method of composite flocculant of garbage leachate |
| CN106315783A (en) * | 2016-10-31 | 2017-01-11 | 天津工业大学 | Method for coagulating impurities in a magnetically-intensified water body |
| CN106430489A (en) * | 2016-10-31 | 2017-02-22 | 天津工业大学 | Water treatment method capable of disturbing ferric forms distribution in flocculating agent |
| CN111592084A (en) * | 2020-06-02 | 2020-08-28 | 中国电建集团成都勘测设计研究院有限公司 | Magnetic powder modified polyferric chloride coagulant and preparation method thereof |
-
2014
- 2014-11-06 CN CN201410630811.XA patent/CN104291426A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152298A (en) * | 2015-10-21 | 2015-12-16 | 华东交通大学 | Preparation method of composite flocculant of garbage leachate |
| CN106315783A (en) * | 2016-10-31 | 2017-01-11 | 天津工业大学 | Method for coagulating impurities in a magnetically-intensified water body |
| CN106430489A (en) * | 2016-10-31 | 2017-02-22 | 天津工业大学 | Water treatment method capable of disturbing ferric forms distribution in flocculating agent |
| CN111592084A (en) * | 2020-06-02 | 2020-08-28 | 中国电建集团成都勘测设计研究院有限公司 | Magnetic powder modified polyferric chloride coagulant and preparation method thereof |
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Application publication date: 20150121 |