Separation agent, preparation method and separation method for emulsified oily wastewater

Abstract

The invention discloses a separation agent, a preparation method and a separation method for emulsification of oily wastewater. The separation agent is a bicarbonate solution containing a switch solvent; the bicarbonate solution containing the switch solvent is prepared by reacting the switch solvent, carbon dioxide and water. The preparation method includes the steps: S1. After mixing the switching solvent with water, a liquid with an oil-water interface is obtained; S2. Passing carbon dioxide into the liquid with an oil-water interface until the pH value of the liquid is stable, and obtaining hydrogen carbonate containing the switching solvent The salt solution; the separation method includes the steps: A. After mixing the emulsified oil-containing wastewater and the separation agent, nitrogen is introduced to obtain a clear aqueous phase and a mixed oil phase; B. After mixing the mixed oil phase and water, carbon dioxide is introduced to The volume of the oil phase is stable, the switch solution is obtained, and after purification, the separation agent is obtained. The invention realizes the separation of oil and water in the emulsified oil-containing wastewater, and meanwhile, the separation agent can be recycled to realize the sustainable separation of the emulsified oil-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of separation of emulsified oily wastewater, and in particular relates to a separation agent, a preparation method and a separation method for emulsified oily wastewater. Background technique [0002] Oily wastewater is one of the biggest sources of pollution in industrial production and human life, and the treatment of oily wastewater has always been one of the biggest challenges facing mankind. According to the different states of oil in the oily wastewater, it can be divided into suspended oil, dispersed oil and emulsified oil, among which emulsified oil is oil droplets with a particle size of less than 20 μm and has high stability. Therefore, the treatment of wastewater containing emulsification faces greater challenges. [0003] At present, the treatment of emulsified oily wastewater is mainly divided into the following categories. (1) Solvent extraction is a traditional oil-water separation method. Si...

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Problems solved by technology

[0003] At present, the treatment of emulsified oily wastewater is mainly divided into the following categories. (1) Solvent extraction is a traditional oil-water separation method. Since most solvent extraction agents are organic solvents, the high volatility of organic solvents restricts the development of the extraction industry. at the same time, the existence of an interfacial film between the solvent and water greatly affects the extraction efficiency

(2) Flocculation treatment of oily sewage is easy to operate, but the use of flocculants will bring secondary pollution to the environment, such as toxic sludge produced by flocculants, polymer flocculants that are difficult to be degraded by the environment, etc.

(3) Electrocoagulation technology requires large power consumption, and electrode loss is also necessary, and toxic chlorine-containing organic substances and sludge will be produced during the flocculation process

It has high permeability and separation efficiency, and is easy to operate, but the treatment of different oily wastewater has a high selectivity to the membrane, and membrane fouling is one of the main factors affecting membrane efficiency and increasing costs

Most of the above separation of emulsified wastewater is unsustainable and will cause secondary pollution or material pollution and loss

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