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Method for treating oil-in-water emulsion by using positive electricity enhanced oleophilic and hydrophobic three-dimensional porous material

A lipophilic, hydrophobic, three-dimensional porous technology, applied in chemical instruments and methods, separation methods, liquid separation, etc., can solve problems such as poor infiltration and limited contact probability, and achieve enhanced oil-water separation effect and high enrichment rate. , The effect of reducing effluent oil concentration and COD value

Active Publication Date: 2020-03-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The lipophilic and hydrophobic three-dimensional porous materials can achieve good adsorption of floating oil, but for oil-in-water emulsions, the continuous water phase makes the lipophilic and hydrophobic three-dimensional materials often not well infiltrated in the emulsion, and forced immersion is required; However, the contact probability between the emulsion dispersed in the continuous water phase and the material is very limited, which is a major difficulty in the processing process.

Method used

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  • Method for treating oil-in-water emulsion by using positive electricity enhanced oleophilic and hydrophobic three-dimensional porous material
  • Method for treating oil-in-water emulsion by using positive electricity enhanced oleophilic and hydrophobic three-dimensional porous material
  • Method for treating oil-in-water emulsion by using positive electricity enhanced oleophilic and hydrophobic three-dimensional porous material

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Experimental program
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Effect test

Embodiment 1

[0050] see figure 1 - attached Figure 5 , a method for treating oil-in-water emulsions with a positively charged lipophilic and hydrophobic three-dimensional porous material provided by the present invention and a comparison of the charging effect of the three-dimensional porous material: the volume is 1*1*3cm 3 , a melamine sponge (MS) with a pore size of 160 μm was soaked in an ethanol solution and ultrasonically cleaned for 20 minutes, washed with water, and dried in vacuum at 60° C. for 4 hours to a constant weight to obtain a pretreated melamine sponge; respectively weighed 0.4 g of dopamine (PDA), Dissolve 0.5g polyethyleneimine (PEI) in 200mL Tris-HCl buffer solution with a pH of 8.5, ultrasonically disperse for 5 minutes, and make a mixed modification solution; add the pretreated MS to the mixed modification solution, and mechanically stir at 200rpm After 18 hours, washed with water, dried in vacuum at 60°C for 4 hours, until constant weight, to obtain a positively-s...

Embodiment 2

[0053] Adopt the MSA prepared by Example 1 and the non-emulsifier oil-in-water emulsion prepared by the MS treatment (a) method of surface modification treatment in the treatment method provided by the invention, and compare the COD value and oil concentration of the filtrate to reduce Effect. The specific treatment method is as follows: Fill the MSA synthesized in Example 1 into the water filtration and oil pumping device, compress and reduce to 1 / 3 of the original volume before use. Prepare the oil-in-water emulsion prepared by the method (a), measure and record the COD value and oil concentration of the initial emulsion. Filter the emulsified hydraulic pressure through the material in a low negative pressure driving environment of 0kPa and a pressure of -1kPa, use a beaker or a plastic graduated tube to connect 10mL of the filtrate, and measure the COD value and oil concentration of the filtrate. Use 1*1*3cm 3 Melamine sponge (MS) replaced MSA, repeated the above operatio...

Embodiment 3

[0056] Prepare positively charged three-dimensional porous materials with different PEI application amounts of 0g to 0.7g, measure their surface chargeability, and use different PEI-modified porous materials to treat the emulsions stabilized by different chargeable emulsifiers prepared by the method (b), Compare its oil concentration reduction effect.

[0057] The specific operation method is as follows: The difference between the positively electrically strengthened three-dimensional porous material prepared in this example and the MSA prepared in Example 1 is that the quality of PEI added is different, which are 0g, 0.1g, 0.2g, 0.3g, 0.4 The gradients of g, 0.5g, 0.6g, and 0.7g prepared porous materials with different positive electric strengths, and characterized their chargeability. The results are as follows Figure 7 As shown, as the amount of PEI modification increases, the isoelectric point of the Zeta potential on the surface of the material moves positively; when the...

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Abstract

The invention relates to a method for treating an oil-in-water emulsion by using a positive electricity enhanced oleophilic and hydrophobic three-dimensional porous material. The method comprises thefollowing specific steps: preparing an oleophylic and hydrophobic three-dimensional porous material which is rich in positive charge groups on the surface; compressing the three-dimensional porous material into a water filtering and oil absorbing device; and treating oil-in-water emulsions of different oil phases, oil-in-water emulsions without emulsifiers and oil-in-water emulsions stabilized bydifferent charged emulsifiers. According to the invention, the adsorption capacity is 68g / g or more for a variety of oils, and more than 80% of COD and oil concentration reduction can be achieved fora variety of emulsion wastewater. The method has the advantages of capability of realizing water purification of emulsion wastewater and recovery of oil resources at the same time, applicability to awide range of different types of oil-in-water emulsions, convenience of operation and mild operation conditions, and has the potential of treating actual waste emulsion.

Description

technical field [0001] The invention belongs to the technical field of oily wastewater treatment, and in particular relates to a method for treating an oil-in-water emulsion with a positively charged three-dimensional lipophilic and hydrophobic porous material. Background technique [0002] With the acceleration of industrialization, the production of oily wastewater is increasing day by day. Oily pollutants discharged from industrial processes such as mechanical processing, especially waste emulsions, have aggravated the problem of oily wastewater pollution and caused serious harm to the environment, economy and human health. According to the existence of oil droplets in wastewater, oily wastewater can be divided into floating oil, dispersed oil, emulsified oil, and dissolved oil. The treatment of slick oil and dispersed oil is relatively easy; the content of dissolved oil is small, which can be disposed of by biochemical methods; and emulsified oily wastewater has become ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022
CPCB01D17/0202
Inventor 刘婉琪彭开铭黄翔峰徐竟成熊永娇张佳路吴宝强
Owner TONGJI UNIV
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