Method for strengthening separation effect of air floatation process by using micro-bubble modification technology

A technology of micro-bubbles and enhanced gas, applied in flotation water/sewage treatment, etc., can solve the problems of large dosage, long reaction time, complicated operation, etc., to reduce water content, increase adhesion probability, and improve separation and recovery efficiency Effect

Inactive Publication Date: 2013-05-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of large dosage of pre-coagulation treatment, long reaction time, complex manipulation and inability to fundamentally eliminate the electrostatic repulsion between the same n

Method used

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  • Method for strengthening separation effect of air floatation process by using micro-bubble modification technology
  • Method for strengthening separation effect of air floatation process by using micro-bubble modification technology

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specific Embodiment approach 1

[0024] Specific implementation mode 1: In this implementation mode, the method of using microbubble modification technology to strengthen the separation effect of the air flotation process is specifically completed according to the following steps:

[0025] 1. Add the microbubble positive charge modifying agent to the microbubble generating system B of the air flotation system, the microbubble positive charge modifying agent is mixed with water and air source evenly, and supersaturation is formed in the pressure dissolved air tank 1 Dissolved air water, in which, the dosage of microbubble positive charge modifier is 0.1mg / L~30mg / L, the pressure in the pressure dissolved air tank 1 is maintained at 0.3MPa~0.6MPa, and the water in the supersaturated dissolved air water and The volume ratio of water to be treated is 5%~70%;

[0026] The air flotation system includes an air flotation tank body A, a microbubble generation system B and a scum collection system C. The microbubble gen...

specific Embodiment approach 2

[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, the microbubble positive charge modifier is a metal coagulant, cationic surfactant, cationic polymer, chitosan or modified chitosan sugar derivatives. Others are the same as in the first embodiment.

[0033] In this embodiment, chitosan and modified chitosan derivatives are non-toxic and harmless, have better biocompatibility and biodegradability, and can be applied in the field of drinking water purification.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the metal coagulant is aluminum chloride, aluminum sulfate, ferrous sulfate, ferric sulfate, ferric chloride, polyferric chloride, polychlorinated One or more combinations of aluminum and polyaluminum sulfate. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for strengthening the separation effect of an air floatation process by using a micro-bubble modification technology, and in particular relates to an air floatation separation process. The invention aims to solve the problems that the existing air floatation process is high in treatment drug dosage before coagulating, long in reaction time and complex in control, and the electrostatic repulsion between bubbles with same negative charges and a target removing material can not be fundamentally eliminated. The method comprises the following steps of: 1, adding a micro-bubble positive charge modification drug into a micro-bubble generation system of an air floatation system; 2, generating micro-bubbles with positive charges to form a stable scum layer; and 3, removing the scum layer. By adopting the method, a coagulation pretreatment stage in the existing air floatation technology is not needed, and the micro-bubble positive charge modification drug is directly added during the generation of the micro-bubbles to generate a functional micro-bubble surface with positive charges, so that the separation and collection efficiency during air floatation is improved. The method is low in technical requirement, short in treatment time and low in construction and running cost, and ensures that a process combination is simplified. The method is used for strengthening the separation effect of the air floatation process.

Description

technical field [0001] The invention relates to an air flotation separation process. Background technique [0002] In the air flotation process, the effective collision and adhesion probability of microbubbles and target particles are the main factors that determine the air flotation effect. In the adhesion process of microbubbles and target particles, electrostatic force plays a dominant role again. In most cases where the air flotation process is used, the target removal material shows different degrees of negative charge due to its own structure ionization, adsorption of anions, coordination complexation, etc., such as: colloidal particles, humic macromolecules Organic matter, algae cells, pathogenic microorganisms, oil droplets, mineral particles, etc. At the same time, the microbubbles generated in the air flotation process also show different degrees of negative charge, which causes the microbubbles to be overcome before they adhere to the target removal. The role of...

Claims

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Application Information

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IPC IPC(8): C02F1/24
Inventor 马军时玉龙邹景田海江进
Owner HARBIN INST OF TECH
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