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Preparation method and application of flocculant for treating urban sewage

A technology of urban sewage and flocculant, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low degree of automation, limited molecular weight, loose structure, etc., to achieve good economic and social benefits, fast sedimentation rate, stable performance. Effect

Inactive Publication Date: 2015-12-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's water treatment technology still has shortcomings such as low efficiency, high energy consumption, high maintenance rate, and low degree of automation.
Among the currently widely used flocculants, polyaluminum flocculants contain aluminum ions, making them unable to be used in food and water supply flocculation processes, and the limited molecular weight of polyaluminum leads to large floc volume and loose structure; polyiron flocculants contain trivalent Iron ions make the floc sludge colored, and there are also problems of limited molecular weight, resulting in large floc volume and loose structure; polyacrylamide, as a high molecular organic flocculant, is not ideal when used alone, and the residual monomer is toxic. It is often used in conjunction with the above inorganic flocculants

Method used

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  • Preparation method and application of flocculant for treating urban sewage
  • Preparation method and application of flocculant for treating urban sewage
  • Preparation method and application of flocculant for treating urban sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take the prepared water glass with a modulus of 2.8, dilute with water to adjust the content to a silica content of 2wt%, and pass the solution through an exchange column filled with American Amberlite IR-120 cation exchange resin to obtain a sodium oxide content of 0.8wt% and a pH of 3.6 dilute silica gel. Under stirring with a Reynolds number of 7500, the mixture obtained above was added to a 10 wt% aluminum sulfate solution having a molar ratio of 5 times the silicate radical, while cooling to keep the temperature of the mixture below 40°C. Then adjust the pH of the stirred mixture to 5 with 5 wt% sodium aluminate solution to produce a clear solution, which is the prepared liquid inorganic composite flocculant, which can be put into use.

[0026] Raw water is selected from native lake water with a turbidity of 14.3NTU, a pH of 8.4, and a water temperature of 14°C. The proportion of adding sewage is 0.05wt%. The operating conditions of the beaker test of the six-way...

Embodiment 2

[0031] Get the solid water glass with a modulus of 3.5 and put it into an autoclave to feed water vapor and keep 3 atmospheric pressure to carry out the pressure steaming reaction to generate liquid water glass. Dilute with water to adjust the content to a silica content of 5 wt%, and pass the solution through an exchange column filled with Amberlite IR-120 cation exchange resin from the United States to obtain a silicic acid colloid solution with a sodium oxide content of 0.5 wt% and a pH of 3.2. Under stirring with a Reynolds number of 7000, the mixture obtained above was added to a 15 wt% aluminum chloride solution whose molar ratio to silicate was 10 times, while cooling to keep the temperature of the mixture below 40°C. Then adjust the pH of the stirred mixture to 5.2 with 7wt% sodium aluminate solution, and dry it in a Shunyi SP-1500 small spray dryer to produce a white solid powder, which is the prepared solid inorganic composite flocculation agent, and the obtained whi...

Embodiment 3

[0036]Get the solid water glass with a modulus of 3.5 and put it into the autoclave to feed water vapor and keep 6 atmospheres to carry out the pressure steaming reaction to generate liquid water glass. Dilute with water to adjust the content to a silica content of 10wt%, and pass the solution through an exchange column filled with NKC-9 macroporous strong acidic cation exchange resin to obtain a silica gel thin solution with a sodium oxide content of 0.32wt% and a pH of 2.9. With stirring at a Reynolds number of 6500, the mixture obtained above was added to a 20 wt% aluminum nitrate solution whose molar ratio to silicate was 30 times, while cooling to keep the temperature of the mixture below 40°C. Then adjust the pH of the stirred mixture to 6 with a 10wt% concentration of sodium aluminate solution, and dry it in a Shunyi SP-1500 small spray dryer to produce a white solid powder, which is the prepared solid inorganic composite flocculation agent, and the obtained white powde...

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Abstract

The invention relates to a preparation method and application of a flocculant for treating urban sewage. The method comprises the following steps: diluting water glass of which the modulus is 2.8 to 3.5 by using water until the content of silicon dioxide is adjusted as 2 to 10 percent by weight, adding a solution to an exchange column filled with cation exchange resin to obtain a silicate gel diluent of which the content of sodium oxide is smaller than 1 percent and the pH value is smaller than 4; adding the solution into metal aluminum salt of which the silicate mole ratio is 5 to 30 under the high-rotation-speed stirring condition that the Reynolds number is greater than 6,000; adjusting the pH value of a mixture obtained by stirring as 5 to 6 by using a sodium aluminate solution of which the concentration is 5 to 10 percent by weight, so that the flocculant can be used; or performing spray drying, wherein an obtained solid also has the same effect. According to the method, multiple pollutants are flocculated and aggregated by using an aggregate with various functional groups. The flocculant is suitable for treating wastewater with various qualities, the pollutant treatment range is wide, the effect is good, the source of production raw materials is wide, the cost is low, the performance is stable, and any environmental pollution is avoided.

Description

technical field [0001] The invention relates to a preparation method and application of a flocculant for treating urban sewage, and belongs to the technical field of sewage treatment technology. Background technique [0002] Urban sewage treatment technology, especially the flocculation and sedimentation technology in urban sewage, plays a vital role in the operation of urban sewage treatment facilities. Nowadays, with the continuous improvement of people's living standards, the demand for various foods is also increasing. At present, my country's water treatment technology still has shortcomings such as low efficiency, high energy consumption, high maintenance rate, and low degree of automation. Among the currently widely used flocculants, polyaluminum flocculants contain aluminum ions, making them unable to be used in food and water supply flocculation processes, and the limited molecular weight of polyaluminum leads to large floc volume and loose structure; polyiron floc...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 郑春明程相芝孙晓红李开放
Owner TIANJIN POLYTECHNIC UNIV
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