Membrane Modification By Functional Nanomaterials And Enhanced Removal For Emerging Contaminants-Antibiotic Resistance Genes

Environmental pollution and resource shortages have been the major challenges that constrain the sustainable development.Innovating wastewater treatment technologies and exploring the removing of emerging contaminants have become a hot topic in the field of water resources management in recent years.Membrane separation technology has been widely used in wastewater treatment and gradually developed into a perfect technological system.However,membrane fouling is a serious problem and needs to be solved.In addition,the removal effect of emerging contaminants(such as antibiotic resistance genes)by the membrane technology is not clearly.Thus,based on the functional nanomaterials,a series of surface modifications were carried out and investigated the removal of antibiotic resistant bacteria and antibiotic resistance genes in this work.The anti-fouling performance of the membrane was enhanced by the co-modification of photocatalytic materials and antibacterial materials.The effective interception and removal of antibiotic resistant bacteria and antibiotic resistance genes were achieved by constructing a photocatalytic membrane filtration system for the depth treatment of secondary effluent.Main contents and results are as follows:1.With the polydopamine serving as an intermediate layer,AgNPs was generated on the PES membrane surface in suit.Next,under the function of the groups induced by PDA layer,TiO2 was modified on the membrane.The structure and morphology of the membrane were measured by the SEM,which indicated that the AgNPs and TiO2 were produced on the membrane surface.The hydrophilic of PES membrane was enhanced through the Ag and TiO2 modification.Owing to the synergistic effect of AgNPs and TiO2,the membrane could take on the efficient anti-fouling and self-cleaning characteristic.2.A photocatalysed reaction membrane system was constructed for removing ARB and ARGs.The TiO2 was modified on the polyvinylidene fluoride membrane surface for the removal of ARB and ARGs during the filtration and photogradation processes.The interception and removal of the ARB and ARGs were improved due to the TiO2 modification.The removal of ARGs located in the genome was more easy than them located in plasmid.The integrons was efficient removed by the photocatalysed reaction membrane system which indicated that the horizontal transfer of ARGs was restrained.