Composite water purifying agent and preparation method and application thereof

A water purifying agent and composite technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem that the floc settlement performance is not greatly strengthened, coordination or electrostatic interaction is loose, The particle size and density increase, etc., to achieve the effect of good water effluent, simple and easy preparation, and improved flocculation ability

Active Publication Date: 2015-03-25
神美科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inorganic components and organic components in the composite flocculant are only loosely combined through coordination or electrostatic interaction, so the binding effect between the inorganic and organic components is not strong
Especially when dealing with low-concentration phosphorus-containing water, although the flocculant has an organic component with a large molecular weight, it has a weak relationship with the inorganic component with a strong phosphorus removal ability, which makes the process of flocculation phosphorus removal The particle size and density of the flocs are limited, and the sedimentation performance of the flocs cannot be greatly enhanced, resulting in an unsatisfactory phosphorus removal effect.
At the same time, these organic components (such as PDMDAAC) that are not tightly combined with inorganic components will still partially remain in the water, resulting in an increase in the content of organic matter in the treated effluent, and even leading to a deterioration of the effluent quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) 100g, deionized water 75ml, hydrogen peroxide and concentrated sulfuric acid are slowly added dropwise to the three-necked flask through a peristaltic pump, the amount of concentrated sulfuric acid is 6ml; the amount of hydrogen peroxide is 19ml, and the reaction is stirred at a constant temperature of 25°C for 2h; the stirring speed is controlled at 120r / min; promptly make the polyferric sulfate of total iron content 11.05%;

[0043] In a 150ml three-necked flask, mix and dissolve dimethyldivinylammonium chloride, vinyltrimethoxysilane and distilled water in a mass ratio of 41:9:50;

[0044] Bubble N into the solution for 20 min 2 , then add the initiator potassium persulfate, the amount of potassium persulfate added accounts for 1.0% of the weight of the first solution; place it in a constant temperature water bath at 50°C, stop after stirring for 8 hours, and the stirring speed is 200r / min to obtain DMDAAC-VTMS co...

Embodiment 2

[0047] The preparation of polyferric sulfate general example 1.

[0048] In a 150ml three-necked flask, dimethyldivinylammonium chloride, vinyltrimethoxysilane and distilled water were mixed and dissolved in a mass ratio of 45:5:50 to obtain the first solution;

[0049] Bubble N into the first solution for 30 min 2 , then add the initiator potassium persulfate, the amount of potassium persulfate added accounts for 1.5% of the weight of the first solution, place it in a constant temperature water bath at 45°C, stop after stirring and polymerizing for 10h, and the stirring speed is 100r / min to obtain DMDAAC-VTMS copolymer;

[0050] Dissolve 1.358g of sodium silicate and 0.635g of ethyl acetate in 5ml of deionized water, mix and stir for 1 hour, adjust the pH of the solution to 4 with hydrochloric acid to obtain polysilicic acid, add 9g of DMDAAC-VTMS copolymer, and mix and stir at 17±2°C 8h, the stirring speed is 100r / min; then add 20ml of polyferric sulfate with a total iron ...

Embodiment 3

[0052] In a 150ml three-necked flask, dimethyldivinylammonium chloride, vinyltrimethoxysilane and distilled water were mixed and dissolved in a mass ratio of 40:9:50 to obtain the first solution;

[0053] Bubble N into the first solution for 30 min 2 , then add the initiator ammonium persulfate, the amount of potassium persulfate added accounts for 1% of the weight of the first solution, place it in a constant temperature water bath at 45°C, stop the polymerization after stirring for 10h, and the stirring speed is 150r / min to obtain DMDAAC-VTMS copolymer;

[0054] Mix the polysilicic acid and the copolymer at a molar ratio of 0.2:1, react at 15°C for 8 hours, and stir at a speed of 150r / min, wherein the modulus of polysilicic acid is 2.6, and the density is 1.3g / ml ;

[0055] Then add polyferric sulfate according to the molar ratio of Fe and Si at 0.5:1, react at 15°C for 2 hours, and stir at a speed of 150r / min for 2 hours to obtain the composite water purifier;

[0056] W...

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PUM

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Abstract

The invention relates to the field of water treatment, in particular to a composite water purifying agent and a preparation method and application thereof. The composite water purifying agent is mainly prepared from polymeric ferric sulfate, dimethyl diallyl ammonium chloride, vinyl trimethoxy silane and polysilicic acid. The total amount of iron and the pH value of the composite water purifying agent are limited, the combination of organic components and inorganic components is closer, the flocculation capability of obtained flocculating constituents is greatly improved, and the composite water purifying agent has a good effect of removing phosphorus in water. According to the special preparation method, the combination of the organic components and the inorganic components forming the composite water purifying agent is closer, and the flocculation capability of the flocculating constituents is improved. The method is simple and easy to operate, does not produce harmful gas in the production process, and is safe and reliable. The composite water purifying agent is applied to treatment for phosphorus wastewater, has the advantages of being less in feeding amount, compact in flocculating constituents, high in sedimentation velocity, good in water-out effect, less in sludge quantity and low in treatment cost, and has significant social and economic benefits.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a composite water purifier and its preparation method and application. Background technique [0002] With the frequent occurrence of algal bloom pollution incidents in domestic surface water bodies in recent years, water eutrophication has become an environmental issue of national and even global concern. Phosphorus is the key factor causing water eutrophication, reducing phosphorus discharge and strengthening the comprehensive treatment of phosphorus-containing sewage and wastewater is an important way to reduce the eutrophication of inland rivers, lakes and other water bodies in China and ensure the safety of drinking water sources. [0003] Chemical flocculation and sedimentation phosphorus removal is currently the most effective and stable phosphorus removal technology, but it has problems such as high cost of chemicals and large amount of sludge generated. In recent years, ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236C02F1/5272C02F1/5281C02F1/54C02F2101/105
Inventor 石伟杰赵华章袁梓文
Owner 神美科技有限公司
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