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Preparation method and preparation device of coagulation type colloid bubbles

A colloidal and coagulation technology, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems that the treatment effect cannot be achieved, and achieve the improvement of sewage treatment effect and life Effect of long period and increase of specific surface area

Inactive Publication Date: 2017-05-17
TONGJI UNIV
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  • Description
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Problems solved by technology

[0004] However, when colloidal bubbles are applied to water purification and water restoration, only rely on the colloidal force between surfactant molecules and target pollutants (the colloidal force between ionic surfactants and target pollutants is electrostatic attraction , the colloidal force between the non-ionic surfactant and the target pollutant is hydrophobic adsorption), usually cannot achieve a good treatment effect; and the use of colloidal bubbles will be limited by the critical micelle concentration of the surfactant

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  • Preparation method and preparation device of coagulation type colloid bubbles
  • Preparation method and preparation device of coagulation type colloid bubbles

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preparation example Construction

[0022] The invention provides a method for preparing colloidal colloidal bubbles, comprising the following steps:

[0023] (1) mixing the amphoteric surfactant and the coagulant to obtain a bubble generating liquid;

[0024] (2) Air is passed into the bubble generating liquid obtained in the step (1), and stirred at a stirring rate of 5000-8000 rpm to obtain coagulation-type colloidal bubbles.

[0025] In the technical solution provided by the invention, the bubble generating liquid has a relatively high critical micelle concentration, which can reach 122-307 mg / L. The life cycle (drainage time) of the coagulation-type colloidal bubbles prepared by the method provided by the invention is long, which is 142~200s; the gas content is high, which is 53-55%; the average diameter of the coagulation-type colloidal bubbles is small, 35 to 45 μm. This can ensure that the coagulation-type colloidal bubbles maintain stable properties during the continuous process of air flotation separ...

Embodiment 1

[0040] (1) 60mg / L (as Al 2 o 3 Total) polyaluminum chloride (PACl) mixes with 109mg / L lauryl dimethyl betaine, and is stirred 5min under the condition of 40rpm at stirring rate to obtain bubble generation liquid;

[0041] (2) Pass air into the bubble generating liquid obtained in step (1), the flow rate of passing air is 33mL / min, and stir for 80s at a stirring rate of 6000rpm to obtain PACl-coagulant colloidal bubbles.

[0042] Omit the polyaluminum chloride in step (1), and prepare ordinary dodecyl dimethyl betaine colloidal bubbles according to the same method.

[0043] The product prepared after step (2) stirring in Example 1 is actually PACl-coagulation type colloidal bubble suspension and common dodecyl dimethyl betaine colloidal bubble suspension, for the PACl- Drainage dynamics test of coagulant colloidal bubble suspension and ordinary dodecyl dimethyl betaine colloidal bubble suspension: at room temperature, the newly prepared colloidal bubble suspension to be teste...

Embodiment 2

[0053] (1) 4.0mg / L (as Al 2 o 3 Total) polyaluminum chloride (PACl) mixes with 44mg / L dodecyl dimethyl betaine, and is stirred 6min under the condition of 30rpm at stirring rate, obtains bubble generation liquid;

[0054] (2) Pass air into the bubble generating liquid obtained in step (1), the flow rate of passing air is 30mL / min, and stir for 90s at a stirring rate of 5000rpm to obtain PACl-coagulation-type colloidal bubbles.

[0055] Omit the polyaluminum chloride in step (1), and prepare ordinary dodecyl dimethyl betaine colloidal bubbles according to the same method.

[0056] According to the method in Example 1, the PACl-coagulant type colloidal bubble suspension prepared in Example 2 and common dodecyl dimethyl betaine colloidal bubble suspension are carried out to discharge kinetics test, the result shows , the life cycle of common dodecyl dimethyl betaine colloidal bubbles is about 108s, and the life cycle of the PACl-coagulation type colloidal bubbles provided by th...

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Abstract

The invention provides a preparation method of coagulation type colloid bubbles. The preparation method comprises the following steps: mixing an ampholytic surfactant with a coagulant so as to obtain a bubble generation liquid; introducing air into the obtained bubble generation liquid, and stirring under a condition that the stirring velocity is 5000-8000rpm, thus obtaining the coagulation type colloid bubbles. The invention further provides a preparation device of the coagulation type colloid bubbles. According to the technical scheme of the invention, the bubble generation liquid has relatively high critical micelle concentration up to 122-307mg / L. The coagulation type colloid bubbles prepared by using the method provided by the invention are long in service life (liquid discharge time), i.e.,, 142-200 seconds, high in gas content, i.e., 53-55%, small in average diameter, i.e., 35-45[mu] m. By adopting the preparation method, the properties of the coagulation type colloid bubbles can be stable in the continuous gas floating separation process, and the sewage treatment effect can be improved.

Description

technical field [0001] The invention relates to the technical field of sewage air flotation treatment, in particular to a preparation method and a preparation device of coagulation-type colloidal bubbles. Background technique [0002] Micro-bubbles have the advantages of large specific surface area and high bubble density, and are widely used in the air flotation treatment process of sewage. Surface modification of micro-bubbles and enhancement of their ability to target pollutants will become a new direction for improving the efficiency of air flotation water purification and developing air flotation technology. The surface modification of micro-bubbles is usually carried out in a solution of flotation agent. The flotation agent is generally a surfactant, which can reduce the surface tension of the solution on the one hand and make it easy to form bubbles under certain disturbance conditions; on the other hand By modifying the surfactant molecules, other molecules or funct...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/52C02F1/56
CPCC02F1/24C02F1/5245C02F1/56
Inventor 张明卢晓丽谢丽周琪
Owner TONGJI UNIV
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