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A kind of preparation method of ammonia nitrogen removal solid flocculant

A flocculant and solid technology, which is applied in the field of preparation of high-efficiency solid flocculant for ammonia nitrogen removal, can solve the problems of complex preparation process operation, increase energy consumption, reduce flocculation active components, etc., achieve simple process, convenient transportation, and improve ammonia nitrogen removal performance Effect

Active Publication Date: 2017-05-17
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of solid iron silicate-based flocculants currently used in the market is relatively complicated due to the instability of silicic acid-based materials; other solid flocculants are mostly obtained by spray-drying liquid products or adding other additives. Agents such as diatomaceous earth, clay and sodium bentonite increase energy consumption and potentially reduce flocculation of active ingredients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a solid polymeric ferric zinc sulfate flocculant. Under normal temperature conditions, 5.8 ml of 98% concentrated sulfuric acid is mixed with 0.19 mol of titanium dioxide industrial by-product ferrous sulfate heptahydrate, and the mixture is stirred at a medium speed until a uniform paste is formed ; Then slowly add 11 ml of sodium chlorate (concentration 3M) ​​and stir at a slow speed to fully oxidize; after the reaction phase is stirred evenly, add solid powdered zinc sulfate according to the nZn / nFe molar ratio of 1:2, and stir slowly to make it completely Dissolve; after the reaction phase is stirred evenly, add solid potassium dihydrogen phosphate according to the nP / nFe molar ratio of 0.25, and stir slowly to dissolve completely; heat in a water bath for hydrolysis polymerization, and stir at a medium speed. The time is 30 min; add 10 ml of water during the stirring process; slowly add 1.34 g of sodium carbonate solid powder during the water...

Embodiment 2

[0028] A preparation method of a solid polymeric ferric zinc sulfate flocculant. Under normal temperature conditions, 4 ml of 98% concentrated sulfuric acid is mixed with 0.15 mol of ferrous sulfate heptahydrate, an industrial by-product of titanium dioxide, and the mixture is stirred at a medium speed until a uniform paste is formed. ; Then slowly add 10.85 ml of sodium chlorate (concentration 3M) ​​dropwise and stir at a slow speed to fully oxidize; after the reaction phase is stirred evenly, add solid powder zinc sulfate according to the nZn / nFe molar ratio of 1:4, and stir slowly to make it completely Dissolve; after the reaction phase is stirred evenly, add solid potassium dihydrogen phosphate according to the nP / nFe molar ratio of 0.15, and stir slowly to dissolve completely; heat in a water bath for hydrolysis polymerization, and stir at a medium speed. The time is 30 min; add 10 ml of water during the stirring process; slowly add 0.67 g of sodium carbonate solid powder ...

Embodiment 3

[0030]A preparation method of a solid polymeric ferric zinc sulfate flocculant. Under normal temperature conditions, 5.8 ml of 98% concentrated sulfuric acid is mixed with 0.19 mol of titanium dioxide industrial by-product ferrous sulfate heptahydrate, and the mixture is stirred at a medium speed until a uniform paste is formed ; Then slowly add 10.85 ml of sodium chlorate (concentration 3M) ​​dropwise and stir at a slow speed for full oxidation reaction; after the reaction phase is stirred evenly, add solid powder zinc sulfate according to the nZn / nFe molar ratio of 1:6, and stir slowly to make it completely Dissolve; after the reaction phase is stirred evenly, add solid potassium dihydrogen phosphate according to the nP / nFe molar ratio of 0.35, and stir slowly to dissolve completely; heat in a water bath for hydrolysis polymerization, and stir at a medium speed. The time is 30 min; add 10 ml of water during the stirring process; slowly add 2.01 g of sodium carbonate solid pow...

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Abstract

The invention relates to a preparation method for a solid flocculant capable of removing ammonia nitrogen. The preparation method comprises the following steps: firstly, acidizing solid ferrous sulfate heptahydrate by utilizing concentrated sulfuric acid, and carrying out slow stirring till a uniform paste is formed; secondly, adding sodium chlorate, and carrying out slow stirring till a brown-yellow solution is formed; thirdly, after the brown-yellow solution is uniformly distributed, adding solid zinc sulfate powder, and carrying out slow stirring till the solid zinc sulfate powder is completely dissolved in the brown-yellow solution; fourthly, after the newly obtained solution is uniformly distributed, adding potassium phosphate monobasic; fifthly, adding sodium carbonate to adjust the alkalization degree of the obtained flocculant, and carrying out water-bath heating; sixthly, after the water-bath heating is finished, adding a cation polyacrylamide solution; finally, carrying out dry heating by utilizing an electric jacket and normal-temperature curing to obtain the light-yellow solid flocculant within a short time. The preparation method provided by the invention has the advantages that generation of waste liquid, waste residue and waste gas in a production process is avoided; the product solidification speed is high; the mass distribution is uniform; the flocculation activity ingredients are high and the flocculation effect is good; the preparation method can be applied to coagulating sedimentation of industrial wastewater, domestic wastewater, source water and the like, and particularly has a remarkable effect of removing ammonia nitrogen in source water.

Description

technical field [0001] The invention relates to the technical field of water treatment water purifiers, in particular to a preparation method of a high-efficiency solid flocculant for ammonia nitrogen removal. Background technique [0002] In recent years, due to the rapid development of industry and agriculture and the improvement of people's living standards, a large number of nitrogen-containing compounds have been discharged into water bodies, resulting in a significant increase in the content of ammonia nitrogen in surface water and groundwater, and the ammonia nitrogen content in some source water exceeds the national standard. The increase of ammonia nitrogen content will cause the reproduction and growth of nitrosifying bacteria and digestive bacteria in the pipe network, which will increase the content of nitrate and nitrite in the pipe network. Because nitrate and nitrite and their transformation products will significantly affect the safety of drinking water and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F101/16
Inventor 朱国成王茜巫尚辉王闯
Owner HUNAN UNIV OF SCI & TECH
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