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Study on Zr-doped Phosphorylated Hybrid Silicas/PSF Composite Membranes

Author: CuiPing
Tutor: ZhangYuQing
School: Tianjin University
Course: Chemical Engineering
Keywords: Phosphate to promote Hybrid silicon Doped zirconium Composite membrane Oily wastewater Hydrophilic
CLC: TB383.2
Type: Master's thesis
Year: 2009
Downloads: 13
Quote: 1
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Abstract


Oily waste water generated by the oil industry and daily life , not only serious pollution to the environment , but also a waste of crude oil and water resources , must oily wastewater treatment before discharge . However , after treatment by conventional methods ( gravitational settling , flocculation , sand filtration and fiber adsorption ) , and can not be completely removed from the water , emulsified oil and dissolved oil . Therefore, removal of oil droplets particle size below 100 μm emulsified oil and dissolved oil is the focus of attention . Membrane separation technology is a process effective way of the oil droplet particle size in the micron level of oily wastewater , which has a simple operation, and low cost advantages . However, due to the membrane material caused by the hydrophobic membrane fouling limits the wide application of membrane separation technology . Therefore, having a strong hydrophilicity and fouling resistance of the membrane material has a very important significance . The method of this paper add a small particle diameter of the inorganic particles to hydrophilic modification of the polysulfone , first strong hydrophilic phosphate promoting zirconium hybrid type doped silicon particles (SZP particles) were prepared by the sol - gel method , and then filled polysulfone prepared organic - inorganic composite film . Phosphate determined to promote the addition amount of the particles of type doped zirconium hybrid silica / polysulfone composite membrane (SZP / PSF composite membrane) applicable to the preparation conditions: the concentration of PSF 12wt % PEG400 the addition amount of PSF in the quality of 10 % , SZP intermittent ultrasound for 10% of the mass of the PSF , the time of the pre-evaporator for 10s, and the coagulation bath temperature of 20 ° C . The mechanical strength and the contact angle of the test showed that the strength of the composite membrane and hydrophilic properties have improved ; The SEM diagram shows composite membranes showed an asymmetric structure , composed of a dense layer and a porous supporting layer , and SZP uniform particle dispersion . Composite film is used to deal with the concentration of 80mg / L of oily wastewater , examine the prepared composite film of oil-water separation , the results show that the composite film has the best performance of the separation , rejection of SZP particles added the polysulfone quality 10% permeate more than 98% of oil content of 0.84mg / L, reached oilfield reinjection water requirements . The anti - pollution performance of the composite membrane with a preliminary study to analyze the reasons of the of SZP particles and composite membrane hydrophilic , trying to explain theoretically the resistance of the composite membrane pollution performance reasons .

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