CN101985373A - Coagulant for removing algae and preparation method thereof - Google Patents
Coagulant for removing algae and preparation method thereof Download PDFInfo
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- CN101985373A CN101985373A CN 201010566885 CN201010566885A CN101985373A CN 101985373 A CN101985373 A CN 101985373A CN 201010566885 CN201010566885 CN 201010566885 CN 201010566885 A CN201010566885 A CN 201010566885A CN 101985373 A CN101985373 A CN 101985373A
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Abstract
The invention discloses a coagulant for removing algae and a preparation method thereof, belonging to the field of environmental conservation. The coagulant comprises the following components by weight percent: 20%-70% of water glass, 10%-50% of ferric trichloride and 10%-40% of dilute sulphuric acid, wherein the water glass contains SiO2 with the mass concentration of 24-30%. The preparation method is as follows: adding all the water glass into a half of the dilute sulphuric acid solution under the stirring condition, and controlling the pH value of the reaction liquid to 2.0-3.5; stopping stirring, standing and polymerizing for 1-10h at the temperature of 10 DEG C-40 DEG C to prepare a colorless and transparent polysilicic acid solution; and mixing all the ferric trichloride and the other half of the dilute sulphuric acid solution under the stirring condition, adding all the polysilicic acid solution, and reacting for 1-5h at the temperature of 25 DEG C-70 DEG C to obtain a brownish-yellow transparent polysilicate ferrite solution. Floccule formed when the coagulant is used is big and dense, thus algae cells can be rapidly and efficiently removed.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to be used for removing the coagulating agent of algae.
Background technology
In water treatment, coagulation process is the most general, most important preposition unit operation technology, yet algae is generally electronegative, has advantages of higher stability, be difficult to realize coagulation, and algae density is little, sedimentation effect is poor, also can stick to filter material surface, make and remove the filter tank obstruction that algae is used, need frequent flushing filter tank, this has just shortened the filter tank cycle of operation.In the water treatment practice, for being the water factory at water source, adopt conventional single variety coagulating agent to have problems such as consumption is big, operational condition is restricted with the lake algae-containing water, treatment effect is undesirable.
Publication number be CN 101244953A, title be " preparation method of copper complex algaecide " to disclose a kind of be the method that raw material is made copper complex algaecide with bivalent cupric ion compound, organism complex compound and promoting agent, its defective is: the raw material of preparation is too expensive.Publication number is that CN101475229A, name are called " a kind of chemical algae removing method " to disclose a kind of be that the composite algicide of feedstock production is added in the algae-containing water body with potassium permanganate, cuprous chloride, aluminum chloride, sodium-chlor etc., 10 talentes can effectively remove algae, its defective is: leave mantoquita and aluminium salt in the water body, and mantoquita and aluminium salt pair people cognition damage.
Summary of the invention
The present invention is for overcoming above-mentioned the deficiencies in the prior art, propose a kind of prepare raw material cheap, be used for removing the coagulating agent of algae safely and efficiently.
Another object of the present invention is to propose the above-mentioned preparation method who is used for except that the coagulating agent of algae.
The present invention is used for the material component except that the coagulating agent of algae
BeWater glass, iron trichloride and dilute sulphuric acid, each component account for total weight percent: water glass 20% ~ 70%, iron trichloride 10% ~ 50%, dilute sulphuric acid 10% ~ 40%; Water glass contains SiO
2Mass concentration be 24 ~ 30%
The present invention is used for except that the preparation method of the coagulating agent of algae; The poly-silicate solution of preparation earlier: under 400 ~ 800r/min stirring velocity condition, the water glass that will account for gross weight 20% ~ 70% all joins in the dilution heat of sulfuric acid of half, the pH value of control reaction solution is 2.0 ~ 3.5, leave standstill polymerization after stopping to stir, the controlled polymerization temperature is 10 ℃ ~ 40 ℃ scopes, polymerization time is 1 ~ 10h, makes water white poly-silicate solution; And then preparation ferric-polysilicate solution: under 100 ~ 400r/min stirring velocity condition, the iron trichloride that will account for gross weight 10% ~ 50% all mixes with remaining second half dilution heat of sulfuric acid, add all described poly-silicate solutions therein, control its temperature of reaction 25 ℃ ~ 70 ℃ scopes, reaction times is 1 ~ 5h, and making pale brown look transparent ferric-polysilicate solution is coagulating agent.
The present invention has adopted the technical grade product or the byproduct of wide material sources, adopts inorganic raw material commonly used such as water glass, iron trichloride, sulfuric acid to be the preparation raw material, and cheap, preparation method is simple.Do not produce waste gas in the preparation process, environmentally friendly.Ferric-polysilicate solution is dropped in the algae-containing water, strengthen charge neutrality, adsorption bridging and the adhesion volume of frustule in ferric-polysilicate solution and the water body by stirring action and sweep the cohesive process of effect, isolate frustule by coagulating sedimentation then, can not destroy the frustule body, avoided the release of algae toxin, have characteristics safely and efficiently, can obtain significant social and economical effectiveness.
Embodiment
The raw material that the present invention is used for except that the coagulating agent of algae is water glass, iron trichloride and dilute sulphuric acid, is made up of this three.Wherein, by the per-cent that accounts for gross weight, water glass accounts for 20% ~ 70%, and iron trichloride accounts for 10% ~ 50%, and dilute sulphuric acid accounts for 10% ~ 40%.Water glass contains SiO
2Mass concentration be 24 ~ 30%.
When preparing above-mentioned coagulating agent, at first preparation gathers silicate solution: under 400 ~ 800r/min stirring velocity condition, the water glass that will account for total weight percent 20% ~ 70% all joins in the dilution heat of sulfuric acid of half, the pH value of control reaction solution is 2.0 ~ 3.5, stop to stir, leave standstill polymerization then, the controlled polymerization temperature is 10 ℃ ~ 40 ℃ scopes, polymerization time is 1 ~ 10h, makes water white poly-silicate solution.Refabrication ferric-polysilicate solution: under 100 ~ 400r/min stirring velocity condition, to account for total weight percent and be 10% ~ 50% iron trichloride all mixes with remaining second half dilution heat of sulfuric acid, add whole poly-silicate solutions that has prepared more therein, control its temperature of reaction 25 ℃ ~ 70 ℃ scopes, its stirring reaction time is 1 ~ 5h, make pale brown look transparent ferric-polysilicate solution, this ferric-polysilicate solution promptly is coagulating agent.
Ferric-polysilicate solution has charge neutrality and adsorption bridging effect simultaneously, overcome the shortcoming that existing poly-silicic acid exists secondary to add as coagulant aids, when adopting ferric-polysilicate solution as coagulating agent, stir sedimentary method by coagulation and can sweep sedimentary comprehensive action with frustule generation charge neutrality, adsorption bridging and adhesion volume, the flco that forms is big and closely knit, can fast and effeciently remove frustule, realize water body purification.
Below provide 2 embodiment with further elaboration the present invention:
Embodiment 1
Under 600r/min stirring velocity condition, the water glass that accounts for gross weight 50% is all joined in the dilution heat of sulfuric acid that accounts for gross weight 10%, the pH value of control reaction solution is 3, stop to stir, leave standstill polymerization then, its polymerization temperature is 30 ℃, and polymerization time is 5h, makes water white poly-silicate solution.Again under 300r/min stirring velocity condition, the iron trichloride that accounts for gross weight 30% is all mixed with the dilution heat of sulfuric acid that accounts for gross weight 10%, the poly-silicate solution that will prepare more all adds wherein, temperature of reaction is 40 ℃, the stirring reaction time is 3h, makes pale brown look transparent ferric-polysilicate coagulating agent.
Prepared ferric-polysilicate coagulating agent is carried out coagulation test to mimic algae-containing water body, and algae is the microcystic aeruginosa of laboratory pure culture, and the content of the chlorophyll a of water body is 4.78 g/L before handling.Find that in process of the test along with the increase of ferric-polysilicate solution input amount, the flco that ferric-polysilicate produces is thick closely knit, volume is bigger, and settling velocity is fast.Input amount is 82.40% to the chlorophyll a clearance when 14mg/L.
Embodiment 2
Under 800r/min stirring velocity condition, the water glass that accounts for gross weight 70% is all joined in the dilution heat of sulfuric acid that accounts for gross weight 20%, the pH value of control reaction solution is 2.0, stop to stir, leave standstill polymerization then, polymerization temperature is 40 ℃, and polymerization time is 10h, makes water white poly-silicate solution.Again under 400r/min stirring velocity condition, with accounting for gross weight is that 50% iron trichloride all mixes with the dilution heat of sulfuric acid that accounts for gross weight 20%, the poly-silicate solution that will prepare more all adds wherein, controlling its temperature of reaction is 70 ℃, the stirring reaction time is 5h, makes pale brown look transparent ferric-polysilicate coagulating agent.
Use after 5 times of the ferric-polysilicate coagulating agent that the prepares dilutions, promptly concentration is 1g/L, and poly-ferric chloride concentration is 1g/L.The test water sample is taken from certain lake water, and its water body chlorophyll alpha is 7 g/L.Carry out coagulation experiment with homemade ferric-polysilicate and commercially available poly-ferric chloride respectively, chlorophyll a behind the mensuration coagulation is observed in experimentation, along with the increase of ferric-polysilicate coagulating agent input amount, the flco that ferric-polysilicate produces is thick closely knit, and settling velocity is fast; And the flco that poly-ferric chloride produces is fluffy, and volume is less, and settling velocity is slow.Ferric-polysilicate obviously is better than commercially available poly-ferric chloride to the removal effect of the chlorophyll a that contains algae lake water.Input amount is when 21mg/L, and ferric-polysilicate is 92.64% to the clearance of chlorophyll a, and poly-ferric chloride is 66.78% to the clearance of chlorophyll a.
Claims (2)
1. a coagulating agent that is used for removing algae is characterized in that: material component
BeWater glass, iron trichloride and dilute sulphuric acid, each component account for total weight percent: water glass 20% ~ 70%, iron trichloride 10% ~ 50%, dilute sulphuric acid 10% ~ 40%; Water glass contains SiO
2Mass concentration be 24 ~ 30%.
2. a preparation method who is used for except that the coagulating agent of algae is characterized in that adopting successively following steps;
(1) the poly-silicate solution of preparation: under 400 ~ 800r/min stirring velocity condition, the water glass that will account for gross weight 20% ~ 70% all joins in the dilution heat of sulfuric acid of half, the pH value of control reaction solution is 2.0 ~ 3.5, leave standstill polymerization after stopping to stir, the controlled polymerization temperature is 10 ℃ ~ 40 ℃ scopes, polymerization time is 1 ~ 10h, makes water white poly-silicate solution;
(2) preparation ferric-polysilicate solution: under 100 ~ 400r/min stirring velocity condition, the iron trichloride that will account for gross weight 10% ~ 50% all mixes with remaining second half dilution heat of sulfuric acid, add all described poly-silicate solutions more therein, control its temperature of reaction 25 ℃ ~ 70 ℃ scopes, reaction times is 1 ~ 5h, and making pale brown look transparent ferric-polysilicate solution is coagulating agent.
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| CN 201010566885 CN101985373A (en) | 2010-11-30 | 2010-11-30 | Coagulant for removing algae and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126780A (en) * | 2011-04-25 | 2011-07-20 | 宜兴禾大水处理技术有限公司 | Application of efficient COD (chemical oxygen demand) remover to wastewater treatment |
| CN102126779A (en) * | 2011-04-25 | 2011-07-20 | 宜兴禾大水处理技术有限公司 | High-efficiency COD remover for waste water treatment |
| CN102276036A (en) * | 2011-07-26 | 2011-12-14 | 常州大学 | Inorganic polymer flocculant for removing algae and preparation method thereof |
| CN102432091A (en) * | 2011-10-27 | 2012-05-02 | 常州大学 | Preparation method of composite flocculant for blue algae biogas slurry pretreatment |
| CN102583672A (en) * | 2012-02-21 | 2012-07-18 | 湖南海利化工股份有限公司 | Polysilicate ferro-copper sulfate composite with wastewater deodorizing and flocculating function and preparation method thereof |
| CN108249532A (en) * | 2018-01-12 | 2018-07-06 | 合肥星巢环保科技有限公司 | A kind of preparation method and application method of the novel sink depressant prescription based on Silica clusters |
| WO2020053272A1 (en) * | 2018-09-11 | 2020-03-19 | LIHME PROTEIN SOLUTIONS ApS | Methods for separation of chlorophyll and soluble proteins |
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| CN1962474A (en) * | 2006-11-22 | 2007-05-16 | 哈尔滨工业大学 | Method for removing pollutant from water |
| CN101333023A (en) * | 2008-05-07 | 2008-12-31 | 济南大学 | Inorganic oxidability high molecular ferro-silicon coagulant, preparation process thereof and applications |
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2010
- 2010-11-30 CN CN 201010566885 patent/CN101985373A/en active Pending
Patent Citations (2)
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| CN1962474A (en) * | 2006-11-22 | 2007-05-16 | 哈尔滨工业大学 | Method for removing pollutant from water |
| CN101333023A (en) * | 2008-05-07 | 2008-12-31 | 济南大学 | Inorganic oxidability high molecular ferro-silicon coagulant, preparation process thereof and applications |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126780A (en) * | 2011-04-25 | 2011-07-20 | 宜兴禾大水处理技术有限公司 | Application of efficient COD (chemical oxygen demand) remover to wastewater treatment |
| CN102126779A (en) * | 2011-04-25 | 2011-07-20 | 宜兴禾大水处理技术有限公司 | High-efficiency COD remover for waste water treatment |
| CN102126779B (en) * | 2011-04-25 | 2012-10-03 | 宜兴禾大水处理技术有限公司 | High-efficiency COD remover for waste water treatment |
| CN102126780B (en) * | 2011-04-25 | 2012-12-12 | 宜兴禾大水处理技术有限公司 | Application of efficient COD (chemical oxygen demand) remover to wastewater treatment |
| CN102276036A (en) * | 2011-07-26 | 2011-12-14 | 常州大学 | Inorganic polymer flocculant for removing algae and preparation method thereof |
| CN102432091A (en) * | 2011-10-27 | 2012-05-02 | 常州大学 | Preparation method of composite flocculant for blue algae biogas slurry pretreatment |
| CN102583672A (en) * | 2012-02-21 | 2012-07-18 | 湖南海利化工股份有限公司 | Polysilicate ferro-copper sulfate composite with wastewater deodorizing and flocculating function and preparation method thereof |
| CN102583672B (en) * | 2012-02-21 | 2013-11-20 | 湖南海利化工股份有限公司 | Polysilicate ferro-copper sulfate composite with wastewater deodorizing and flocculating function and preparation method thereof |
| CN108249532A (en) * | 2018-01-12 | 2018-07-06 | 合肥星巢环保科技有限公司 | A kind of preparation method and application method of the novel sink depressant prescription based on Silica clusters |
| WO2020053272A1 (en) * | 2018-09-11 | 2020-03-19 | LIHME PROTEIN SOLUTIONS ApS | Methods for separation of chlorophyll and soluble proteins |
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Application publication date: 20110316 |