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Method for demulsifying emulsion in wastewater

An emulsion and demulsification technology, applied in the field of environmental sewage treatment, can solve the problems of energy consumption and pollutants, and achieve the effect of low cost and low energy consumption

Inactive Publication Date: 2016-10-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional demulsification methods mentioned above consume more energy and will bring new pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] 1) Graft glycidyl methacrylate on the polypropylene nonwoven fabric by ultraviolet irradiation, so that the grafting rate is 5%; 2) shrink the methacrylic acid on the surface of the polypropylene nonwoven fabric with n-butylamine The epoxy group of the glyceride is opened, and the hydrophilic and hydrophobic sites are constructed on the surface of the polypropylene non-woven fabric to obtain the modified polypropylene non-woven fabric; Adsorb 100mL emulsion containing 80mg / L octylphenol polyoxyethylene ether (TX-100) (the density of the emulsion is about 1g / mL) (at 15°C, the critical micelle concentration of TX-100 emulsion is 80mg / L). After stirring for 5 minutes, the surface tension of the emulsion increased from 20mN / m to 45mN / m (the surface tension of the emulsion at the critical micelle concentration is 20mN / m). The surface tension of the emulsion increases after adsorption, indicating that the micelles in the emulsion are destroyed.

example 2

[0022] 1) Graft glycidyl methacrylate on the polypropylene nonwoven fabric by means of high-energy radiation, so that the grafting rate is 25%; 2) shrink the methacrylic acid on the surface of the polypropylene nonwoven fabric with n-dodecylamine The epoxy group of the glyceride is opened, and the hydrophilic and hydrophobic sites are constructed on the surface of the polypropylene nonwoven fabric to obtain a modified polypropylene nonwoven fabric; at 35 ° C, 0.1 g of the modified PP nonwoven Adsorb 100mL of an emulsion containing 240mg / L nonylphenol ethoxylate (NP-10) (the density of the emulsion is about 1g / mL) (at 35°C, the critical micelle concentration of NP-10 emulsion is 220mg / L). After stirring for 15 minutes, the surface tension of the emulsion increased from 35.6mN / m to 50mN / m (the surface tension of the emulsion at the critical micelle concentration is 35.0mN / m).

example 3

[0024] 1) Graft glycidyl methacrylate on the polypropylene nonwoven fabric by ultraviolet irradiation method, so that the grafting rate is 50%; 2) Use hexamethylenediamine to graft glycidyl methacrylate on the surface of the polypropylene nonwoven fabric The epoxy group of the ester is opened, and hydrophilic and hydrophobic sites are constructed on the surface of the polypropylene nonwoven fabric to obtain a modified polypropylene nonwoven fabric; at 55 ° C, 1.0 g of the modified PP nonwoven fabric is used 100mL of an emulsion containing 70mg / L fatty alcohol polyoxyethylene ether (the density of the emulsion is about 1g / mL) (at 55°C, the critical micelle concentration of the fatty alcohol polyoxyethylene ether emulsion is 60mg / L). After stirring for 25 minutes, the surface tension of the emulsion increased from 31.4mN / m to 55mN / m (the surface tension of the emulsion at the critical micelle concentration is 31.0mN / m).

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PUM

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Abstract

The invention discloses a method for demulsifying emulsion in wastewater; comprising: 1), grafting glycidyl methacrylate to polypropylene nonwoven by means of ultrasonic irradiation or high-energy irradiation within a grafting range of 5%-120%; 2), opening epoxy groups of the glycidyl methacrylate on the surface of the polypropylene nonwoven by using an amine having 4-19 carbons, and constructing hydrophilic and hydrophobic sites on the surface of the polypropylene nonwoven to obtain the modified propylene nonwoven; 3), placing the modified polypropylene nonwoven in emulsion at 10-100 DEG C, stirring for 5-40 min to demulsify the emulsion, wherein a weight ratio of the modified polypropylene nonwoven to the emulsion is 0.01% to 10%. The method has no need for any energy, is low in cost, and is applicable to large-scale wastewater treatment; the method is free of any chemical reagents and is free of other pollutants to a water body.

Description

technical field [0001] The invention relates to the field of environmental sewage treatment, in particular to a method for breaking emulsions in sewage. Background technique [0002] Emulsions are widely used in industry and life due to their good properties. At present, the pollution of emulsions to water bodies is becoming more and more serious, and the problem of emulsion pollution is still an unsolved problem. The general demulsification methods can be divided into physical mechanical method and physical chemical method. The physical mechanical method includes electric precipitation, filtration, ultrasonic, etc.; the physical chemical method mainly changes the interface properties of the emulsion to break the emulsion, such as adding a demulsifier. Jin Yang of Sichuan University and others used a hydrorotator to demulsify the phosphoric acid-tributylphosphate emulsion (Cao Y, Jin Y, Li J, et al. Demulsification of the phosphoric acid-tributylphosphate (W / O) emulsion by...

Claims

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Application Information

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IPC IPC(8): C02F1/40C02F1/28
CPCC02F1/40C02F1/28
Inventor 魏俊富王菲菲周翔宇张环汤小龙
Owner TIANJIN POLYTECHNIC UNIV
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