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High polymeric aluminium-bentonite composite coagulant and in situ generating preparation method thereof

An in-situ generation, bentonite technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of no preparation of bentonite composite coagulant, poor dehydration effect of flocs, slow solid-liquid separation speed, etc., and achieve the treatment effect. Increase, low price, small dosage effect

Inactive Publication Date: 2009-12-30
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because bentonite has the characteristics of swelling, dispersion and suspension in water, when using bentonite raw soil to treat wastewater, the effect is poor, especially the solid-liquid separation speed is slow, and the dehydration effect of flocs is poor, which affects its practical application.
However, there is no report on the preparation of bentonite composite coagulants by in-situ generation of high-polymer aluminum coagulants in montmorillonite sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, an in-situ generation preparation method of a high-polymerization aluminum-bentonite composite coagulant, with 10 parts of granular bentonite, 1 part of aluminum chloride, 3 parts of sodium carbonate and 86 parts of water to form raw materials, the following steps are carried out sequentially step:

[0022] 1), sodium carbonate is dissolved in water, makes sodium carbonate saturated solution, as polymerization agent solution;

[0023] 2), aluminum chloride is mixed with the remaining water [that is, 86 parts of water-the water used in step 1)] to make an aluminum salt solution;

[0024] 3), adding granular bentonite to the aluminum salt solution, and after mixing evenly, soak the bentonite in the aluminum salt solution for 3 hours, so that the aluminum salt can fully enter between the bentonite sheets;

[0025] The above steps 1) to 3) are all carried out at room temperature.

[0026] 4), then add the polymerization agent solution to the result of step 3...

Embodiment 2

[0027] Embodiment 2, an in-situ generation and preparation method of a high-polymer aluminum-bentonite composite coagulant, with 25 parts of granular bentonite, 5 parts of aluminum sulfate, 1 part of sodium hydroxide and 69 parts of water as raw materials, the following steps are carried out in sequence step:

[0028] 1), sodium hydroxide is dissolved in 18 parts of water, makes sodium hydroxide solution, as polymerization agent solution;

[0029] 2), aluminum sulfate and 51 parts of water are mixed to make aluminum salt solution;

[0030] 3), adding granular bentonite to the aluminum salt solution, mixing evenly, soaking the bentonite in the aluminum salt solution for 6 hours, so that the aluminum salt can fully enter between the bentonite sheets;

[0031] The above steps 1) to 3) are all carried out at room temperature.

[0032] 4), then add the polymerizing agent solution to the result of step 3) under stirring, and carry out in-situ polymerization at 20°C (keep stirring ...

Embodiment 3

[0034] Embodiment 3, an in-situ generation preparation method of a high-polymerization aluminum-bentonite composite coagulant, with 5 parts of granular bentonite, 8 parts of aluminum chloride, 4 parts of sodium silicate and 83 parts of water as raw materials, followed by The following steps:

[0035] 1), dissolving sodium silicate in 15 parts of water to make a sodium silicate solution as a polymerization agent solution;

[0036] 2), aluminum chloride and 68 parts of water are mixed to make aluminum salt solution;

[0037] 3), adding granular bentonite to the aluminum salt solution, and after mixing evenly, soak the bentonite in the aluminum salt solution for 3 hours, so that the aluminum salt can fully enter between the bentonite sheets;

[0038] The above steps 1) to 3) are all carried out at room temperature.

[0039] 4), then add the polymerization agent solution to the result of step 3) under stirring, and carry out in-situ polymerization at 90°C (keep stirring during t...

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Abstract

The invention discloses a high polymeric aluminium-bentonite composite coagulant which comprises the ingredients by weight percent: 5-25wt% of bentonite, 1-10wt% of aluminium salt, 1-5wt% of polymerizing agent and the balance water. The invention also discloses an in situ generating preparation method of the high polymeric aluminium-bentonite composite coagulant, comprising the steps: 1) the polymerizing agent is dissolved in the water, and the polymerizing agent solution is prepared; 2) the aluminium salt is mixed with the water, and aluminium salt solution is obtained; 3) the obtained aluminium salt solution is added with granular bentonite, and the aluminium salt solution and the granular bentonite are evenly mixed together, so that the bentonite is soaked in the aluminium salt solution; 4) the product obtained in the step 3) is added with the polymerizing agent solution in a stirring state for in situ polymerization reaction, so that the colloidal high polymeric aluminium-bentonite composite coagulant can be obtained. When being used for treating waste water, the composite coagulant has the characteristics of being economical and efficient.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an in-situ generation and preparation method of a high-polymerization aluminum-bentonite composite coagulant. Background technique [0002] Wastewater from textile printing and dyeing or papermaking industries has large volume, high chroma, large changes in water quality, high content of organic pollutants, and complex components. In recent years, the use of PVA slurry and new additives has made organic pollutants that are difficult to biodegrade The content in wastewater has greatly increased. It is difficult and costly to treat with a single agent or process. Therefore, it is necessary to develop an efficient and economical printing and dyeing wastewater treatment agent on the basis of combining different agents. Bentonite is a clay rock mainly composed of montmorillonite, which is one of the most widely used non-metallic minerals. Because bentonite has the chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 林俊雄汪澜马廷方孙国君
Owner ZHEJIANG SCI-TECH UNIV
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