The Removal Efficiency Of Antibiotic Resistance Genes In Secondary Effluent And Membrane Fouling Mechanisms By UF With Different Characteristics

Antibiotic resistance gene in sewage is a new type of pollutant,because the resistance gene can be transferred horizontally,so the traditional water treatment process can not remove it effectively,especially in biological treatment unit may also make gene transfer.Poly vinyl fluoride(PVDF)and polyethersulfone(polyethersulfone)were compared in this study.Removal of antibiotic resistance genes and other pollutants from secondary effluent of wastewater treatment plants by pes ultrafiltration membranes with different molecular weight cut-off(50 k Da,100 k Da).membrane properties and membrane fouling characteristics of ultrafiltration membranes with different characteristics were analyzed.The analysis was carried out.The removal efficiency of ultrafiltration membrane with different materials(PES,PVDF)and different molecular weight cutoff(50 k Da,100 k Da)for antibiotic resistance genes and other pollutants showed that the removal efficiency of ultrafiltration membrane with molecular weight cutoff of 50 k Da was better than that of 100 k Da ultrafiltration membrane with the same material.The removal ability of antagonistic genes of pes ultrafiltration membrane was better than that of PVDF ultrafiltration membrane.The dissolved organic compounds in raw water are mainly fulvic acids,soluble metabolites and humic acids.The removal efficiency of 50 k Da ultrafiltration membrane was higher than that of 100 k Da,but there was no significant difference between 50 k Da ultrafiltration membrane and 50 k Da ultrafiltration membrane.Different resistance genes were positively correlated with int ? 1,16 Sr DNA and total organic matter(TOC).The absolute value of zeta potential of pes ultrafiltration membrane is relatively high,which is easy to enhance plasmid transfer ability and enhance the removal effect of pollutants such as antagonistic genes.The study on membrane fouling performance of ultrafiltration membranes with different materials and different cut-off molecular weight showed that the membrane with smaller cut-off molecular weight had faster specific flux drop and larger intrinsic resistance.The membrane specific flux of PVDF ultrafiltration membrane decreased rapidly with the same pore size.The membrane flux recovered to some extent after backwash.with the experiment,the reversible pollution decreased and the irreversible pollution increased gradually.The infrared spectrum of each substance shows that there are a large number of f atoms on the surface of PVDF ultrafiltration membrane,and the functional groups in raw water pollutants contain h atoms,which will produce strong hydrogen bonding force,so PVDF membrane is more likely to be contaminated.Pes membrane surface contains s = o symmetric and anti-symmetric telescopic vibration,easy to form water bridge between hydrophilic areas,can improve the membrane specific flux of ultrafiltration membrane;Pes membrane surface has benzene ring structure,and DNA can be molecular docking with benzene ring structure,so pes ultrafiltration membrane is superior to PVDF ultrafiltration membrane in removing args.The contact angle of PVDF ultrafiltration membrane was larger than pes,and membrane fouling was more likely to occur.The ultrafiltration membrane of 50 k Da had greater contact than that of 100 k Da.Pvdf contaminated membrane surface has a thick deposition layer,the appearance roughness is higher than pes,membrane pollution is serious,after backwashing has a certain degree of recovery.