Studies On The Preparation And Anti-fouling Performance Of Ultrafiltration Membrane Based On Tr(?)ger’s Base/SPSF Blending

Ultrafiltration is an efficient and energy-saving wastewater and drinking water treatment technology.It has been widely focused because of its low energy consumption,high separation efficiency and non secondary pollution.The previous studies showed ultrafiltration exhibited a high separation efficiency of suspened solids,dissolved organic contaminents and bacteria and so on,however,membrane flouing occurs during the ultrafiltration seperation,which hinders the application of ultrafiltration technology in water and wastewater treatment.The blending of the hydrophilic materials and the membrane materials can hold the characteristics of the original base membrane materials,furthermore,which can effectively improve the hydrophilicity of the membrane.It was proved to be a practical method to weaken ultrafiltration membrane flouing.In this paper,Tr(?)ger’s base(TB),a novel polymer material with self-micropores was selected,and a novel polymer ultrafiltration membrane with excellent hydrophilicity,high rejection and good anti-fouling properties was prepared base on ring-opening reaction and physical blending hydrophilic modification,which improved the poor permeability and severe membrane fouling of ultrafiltration membranes in water treatment applications.The main results were as follows:1.Blending ultrafiltration membranes were prepared by physically blending Tr(?)ger’s base(TB)and sulfonated polysulfone(SPSF),and the effects of different blending rates of TB and SPSF on the morphology,hydrophilicity and membrane separation performance of ultrafiltration membranes were investigated.The results showed that the tertiary amine of TB and the sulfonic acid group of SPSF generate ammonium sulfonate through the cross-linking reaction,which improved the hydrophilicity of the ultrafiltration membrane and obtained better anti-fouling property;The porosity and surface pore diameter of the ultrafiltration membrane were increased,and the thickness of the dense top layer was decreased,higher pure water flux and foulant rejection were obtained.2.Hydrophilic Tr(?)ger’s base(TB-ro)was prepared by ring-opening reaction,TB-ro and SPSF were physically blending to prepare ultrafiltration membranes.Effects on the morphology,hydrophilicity and properties of blending ultrafiltration membranes prepared by TB-ro with different ring-opening rates were investigated.The results showed that the modified of secondary amine groups in the TB-ro polymer chain,improved the hydrophilicity of the blending ultrafiltration membranes and obtained higher anti-fouling property;Simultaneously,the modified of secondary amine groups increased the porosity and surface pore size of the ultrafiltration membranes,facilitated the formation of finger-like pores under the top layer,higher pure water flux and higher rejection to foulants were obtained.3.The separation of industrial emulsified oily wastewater with TB and SPSF blending ultrafiltration membranes was explored via investigating flux and COD rejection property of oily wastewater.The results showed that the rejection rate of the blending membrane to the emulsified oil exceeded 95%.After the three runs of fouling and cleaning processes with emulsified oily wastewater,the membranes flux recovery rate exceeded 60%,showed excellent anti-emulsified oil fouling property.