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Preparation method of flocculant for sewage treatment

A technology of sewage treatment and flocculant, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as reducing application, and achieve the effect of reducing waste water load, improving retention rate and high recovery rate

Inactive Publication Date: 2012-09-19
何斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it has become one of the most widely used flocculants. However, the monomer acrylamide of polyacrylamide is a carcinogen, and many countries have reduced its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Add 100ml of water to 10g of cassava flour, put it in a blender, control the speed of 150 r.p.m, and the temperature of 90±1°C, gelatinize for 30 minutes and cool to room temperature;

[0020] 2) Dissolve 5g of polyacrylamide with a relative molecular weight of 1 million in 75ml of water, add 50ml of sodium hypochlorite aqueous solution with a concentration of 10%, first control the speed at 200 r.p.m for 8 minutes, then control the speed at 100 r.p.m, and react at room temperature 2 hours;

[0021] 3) Take 500mL of sodium silicate solution with a pH value of 3-4 and a modulus of 3.5 in a three-necked flask, and place it in a constant temperature water bath, add the preparations in steps 1) and 2), and add 20g of carboxymethyl Sodium cellulose, stirred and dissolved, when the temperature of the water bath reached 70°C, add 0.001g of potassium persulfate and 0.007g of sodium sulfite as a crosslinking agent, and react in a constant temperature water bath for 5 hours to...

Embodiment 2

[0024] 1) Add 100ml of water to 10g of sweet potato powder, put it in a blender, control the speed of 200 r.p.m, and the temperature of 90±1°C, gelatinize for 30 minutes and cool to room temperature;

[0025] 2) Dissolve 5g of polyacrylamide with a relative molecular weight of 5 million in 75ml of water, add 50ml of sodium hypochlorite aqueous solution with a concentration of 10%, first control the speed at 200 r.p.m for 10 minutes, then control the speed at 100 r.p.m, and react at room temperature 1 hour;

[0026] 3) Take 500mL of sodium silicate solution with a pH value of 3-4 and a modulus of 3.8 in a three-necked flask, and place it in a constant temperature water bath, add the preparations in steps 1) and 2), and add 20g carboxymethyl Sodium cellulose, stirred and dissolved, when the water bath temperature reached 70°C, add 0.002g potassium persulfate and 0.008g as cross-linking agent, react in constant temperature water bath for 5h, and obtain the flocculant solution.

...

Embodiment 3

[0029] 1) Add 100ml of water to 10g of corn flour, put it in a blender, control the speed of 250 r.p.m, and the temperature of 90±1°C, gelatinize for 30 minutes and cool to room temperature;

[0030] 2) Dissolve 5g of polyacrylamide with a relative molecular mass of 5 million in 75ml of water, add 50ml of sodium hypochlorite aqueous solution with a concentration of 10%, first control the speed at 200 r.p.m for 8 minutes, then control the speed at 100 r.p.m, and react at room temperature 4 hours;

[0031] 3) Take 500mL of sodium silicate solution with a pH value of 3-4 and a modulus of 4 in a three-necked flask, and place it in a constant temperature water bath, add the preparations in steps 1) and 2), and add 20g of carboxymethyl Sodium cellulose, stir to dissolve, add 0.003g potassium persulfate and 0.006g as a cross-linking agent when the water bath temperature reaches 70°C, and react in a constant temperature water bath for 5 hours to obtain a flocculant solution.

[0032]...

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Abstract

The invention relates to a preparation method of a flocculant for sewage treatment. The flocculant is compounded from the raw materials, namely polyacrylamide, starch, sodium hypochlorite, sodium carboxymethyl cellulose, sodium silicate, potassium persulfate, sodium sulfite and water. The flocculant prepared by the method disclosed by the invention has the advantages of greenness, environment-friendly property, low cost, low dosage, fast flocculation speed, less sludge, convenience in use, safety and the like.

Description

[0001] technical field [0002] The invention relates to a preparation method of a composite flocculant, in particular to a preparation method of an environmentally friendly and low-cost inorganic-organic composite flocculant for water treatment. [0003] Background technique [0004] In recent years, with the rapid development of China's national economy, the contradiction between water supply and demand has become increasingly prominent. Water scarcity and water pollution have posed a serious threat to the development of China's national economy, industrial and agricultural production, and people's lives. Sewage treatment and reuse is the main way to solve the water crisis. The flocculation and sedimentation method is an economical and convenient method for sewage treatment. In the flocculation and sedimentation method, the choice of flocculant is the most critical. Among flocculants, inorganic flocculants have disadvantages such as large dosage and high moisture conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 何斌
Owner 何斌
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