Cellulose compound water-treatment flocculant and application method thereof

A cellulose and flocculant technology, applied in the field of water treatment, can solve the problems of high price of polyacrylamide, limited use, residual toxic substances, etc., and achieve the effects of reducing the dosage of drugs, reducing treatment costs, and fast settling speed.

Active Publication Date: 2014-09-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of polyacrylamide is relatively high, and toxic substance residues often appear in the production process, so its use is subject to certain restrictions.

Method used

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  • Cellulose compound water-treatment flocculant and application method thereof
  • Cellulose compound water-treatment flocculant and application method thereof
  • Cellulose compound water-treatment flocculant and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Taking lake water in the southern region as the treatment object, when the water temperature is 22°C and the turbidity is 17.63NTU, it belongs to low turbidity source water. First add aluminum sulfate to the water at a concentration of 20mg / L, stir rapidly at a speed of 300r / min for 60s, stop stirring, add cellulose at a concentration of 50mg / L, continue to stir rapidly for 60s, and neutralize at a speed of 100r / min Stir at a high speed for 5 minutes, then stir at a slow speed of 50r / min for 10 minutes, stop stirring, let it settle for 20 minutes, take the supernatant for detection, the remaining turbidity is 0.65NTU, and the remaining aluminum is 0.61mg / L. Under the same conditions, only aluminum sulfate was added, and the remaining turbidity of the effluent was 7.56 NTU, and the residual aluminum was 0.94 mg / L.

Embodiment 2

[0027] Taking lake water in the southern region as the treatment object, when the water temperature is 22°C and the turbidity is 17.63NTU, it belongs to low turbidity source water. First add ferric chloride to the water, the concentration is 20mg / L, stir rapidly at a speed of 300r / min for 60s, stop stirring, add cellulose, the concentration is 40mg / L, continue to stir rapidly for 60s, at a speed of 100r / min Stir at a medium speed for 5 minutes, then stir at a slow speed of 50r / min for 10 minutes, stop stirring, let it settle for 20 minutes, take the supernatant for testing, the remaining turbidity is 0.71NTU, and the remaining iron is 1.74mg / L. However, under the same conditions, the residual turbidity of the effluent was 3.41 NTU, and the residual iron was 2.43 mg / L.

Embodiment 3

[0029] Taking lake water in the southern region as the treatment object, the raw water temperature is 19°C, the turbidity is 67.73NTU, and the oxygen consumption is 5.17mg / L. First add ferric chloride to the water with a concentration of 30mg / L, stir rapidly at a speed of 500r / min for 30s, stop stirring, add cellulose at a concentration of 15mg / L, and continue to stir rapidly at a speed of 300r / min for 30s, Stir at a medium speed at a speed of 200r / min for 5min, stir at a slow speed at a speed of 100r / min for 10min, stop stirring, let it settle for 20min, take the supernatant for testing, the remaining turbidity is 4.21NTU, and the oxygen consumption is 1.53 mg / L. However, under the same conditions, only ferric chloride was added, the residual turbidity of the effluent was 11.81NTU, and the oxygen consumption was 2.24mg / L.

[0030]In winter lake water in South China, when the water temperature is 12-14°C, the turbidity is 10-20NTU, and the oxygen consumption is 2.36-3.69mg / L,...

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Abstract

The invention provides a cellulose compound water-treatment flocculant and an application method thereof, and relates to a water treatment technology. The water-treatment flocculant is prepared from the following components in parts by mass: 1 to 5 parts of cellulose and 1 to 3 parts of a coagulant, wherein the flocculant is selected from aluminum sulfate, ferric chloride or aluminium polychlorid and the like. The application method comprises the following steps: firstly, adding the flocculant into water and stirring for 30 to 60 seconds under a revolving speed of 300r/min to 500r/min (Revolutions Per Minute); then adding the cellulose and further stirring for 1 minute at the revolving speed of 200r/min to 300r/min; further stirring for 5 minutes at the revolving speed of 100r/min to 200r/min; finally, stirring for 10 minutes at the revolving speed of 50r/min to 100r/min; standing for sedimentation for 15 to 20 minutes after the stopping of stirring. According to the method, the adding amount of the conventional flocculant is reduced; the sedimentation performance of the flocculant body is improved; the treatment cost is lowered; the standing time of a sedimentation basin is shortened; the occupation area of the sedimentation basin is reduced and the like. The cellulose can also be used for removing partial soluble pollutants.

Description

technical field [0001] The invention relates to water treatment technology, in particular to a cellulose compound water treatment flocculant which is compounded with cellulose and a traditional coagulant and its application method. Background technique [0002] Coagulation sedimentation is currently the most commonly used physical and chemical treatment method in the water treatment process. It is a key link in the treatment process, and its treatment effect is closely related to the type and performance of the coagulant. Coagulants can be divided into inorganic low-molecular coagulants, inorganic polymer coagulants and organic polymer coagulants. These types of coagulants have certain defects during use, such as aluminum-based and iron-based coagulants. The dosage of coagulant is large, the amount of mud produced is large, there are health and safety hazards, the cost of polyacrylamide is high, and the production raw materials have "three-to-one" effects, etc. With the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/52
Inventor 黄金阳卢昌义
Owner XIAMEN UNIV
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