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, high recovery rate and improving retention rate

Active Publication Date: 2012-10-03
湖南科尔顿水务集团有限公司
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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

[0015] 1) Add 100ml of water to 10g cassava flour, place it in a blender, control the speed to 150 r.p.m, the temperature is 90±1℃, gelatinize for 30 minutes and then cool to room temperature;

[0016] 2) Dissolve 5g of polyacrylamide with a relative molecular mass of 1 million in 75ml of water, add 50ml of 10% sodium hypochlorite aqueous solution, first control the speed at 200 rpm for 8 minutes, then control the speed at 100 rpm, and react at room temperature 2 hours;

[0017] 3) Take 500 mL of a sodium silicate solution with a pH 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 of steps 1) and 2) and add 20g of carboxymethyl When the temperature of the water bath reaches 70°C, 0.001g potassium persulfate and 0.007g sodium sulfite are added as crosslinking agents, and reacted in a constant temperature water bath for 5 hours to obtain a flocculant solution.

[0018] The flocculant was tested with wastewater ...

Embodiment 2

[0020] 1) Add 100ml of water to 10g sweet potato powder, place it in a mixer, control the rotation speed to 200 r.p.m, and the temperature to 90±1°C, gelatinize for 30 minutes and then cool to room temperature;

[0021] 2) Dissolve 5g of polyacrylamide with a relative molecular mass of 5 million in 75ml of water, add 50ml of a 10% sodium hypochlorite aqueous solution, first control the speed at 200 rpm for 10 minutes, then control the speed at 100 rpm, and react at room temperature 1 hour;

[0022] 3) Take 500 mL of sodium silicate solution with PH value of 3-4 and modulus of 3.8 in a three-necked flask and place it in a constant temperature water bath. Add the preparations of steps 1) and 2) and add 20g of carboxymethyl at the same time When the temperature of the water bath reaches 70°C, add 0.002g potassium persulfate and 0.008g as crosslinking agent, and react in a constant temperature water bath for 5 hours to obtain a flocculant solution.

[0023] The flocculant was tested wit...

Embodiment 3

[0025] 1) Add 100ml of water to 10g of corn flour, place it in a blender, control the speed at 250 r.p.m, and the temperature at 90±1°C, gelatinize for 30 minutes and then cool to room temperature;

[0026] 2) Dissolve 5g of polyacrylamide with a relative molecular mass of 5 million in 75ml of water, add 50ml of 10% sodium hypochlorite aqueous solution, first control the speed at 200 rpm for 8 minutes, then control the speed at 100 rpm, and react at room temperature 4 hours;

[0027] 3) Take 500 mL of sodium silicate solution with pH 3-4 and modulus 4 in a three-necked flask and place it in a constant temperature water bath. Add the preparations of steps 1) and 2) and add 20g of carboxymethyl When the water bath temperature reaches 70°C, add 0.003g potassium persulfate and 0.006g as crosslinking agent, and react for 5h in a constant temperature water bath to obtain a flocculant solution.

[0028] The flocculant was tested with wastewater from a stone factory (CODcr=700mg / L, turbidit...

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PUM

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Abstract

The invention relates to a flocculant for sewage treatment. The flocculant is prepared by compounding the raw materials of polyacrylamide, starch, sodium hypochlorite, sodium carboxymethylcellulose, sodium silicate, potassium peroxydisulfate, sodium sulfite and water. The prepared flocculant has the advantages of green and environmental protection, low cost, small addition amount, quick flocculation speed, little sludge, convenience and safety in use and the like.

Description

Technical field [0001] The invention relates to a composite flocculant, in particular to an environment-friendly and low-cost inorganic-organic composite flocculant for water treatment. Background technique [0002] 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 constituted 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. Flocculation sedimentation method is an economical and simple method for sewage treatment. In the flocculation sedimentation method, the choice of flocculant is the most critical. Among flocculants, inorganic flocculants have disadvantages such as large dosage and high sludge moisture content. The existing organic polymer flocculants can overcome the above shortcomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 徐梁冰
Owner 湖南科尔顿水务集团有限公司
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