海水养殖废水中磺胺甲(口恶)唑降解及同步反硝化研究OA

The traditional treatment process of mariculture wastewater has low efficiency and high operating costs for the treatment of antibiotics and nitrate nitrogen.Using the typical antibiotic sulfamethoxazole(SMX)as the research object,and seaweed extract as the additional carbon source,a moving bed biofilm reactor is constructed to achieve SMX degradation and simultaneous denitrification.The results show that when the influent carbon to nitrogen ratio is 2∶1 and the hydraulic residence time is 24 h,the average removal rate of SMX is 76％and the average removal rate of nitrate nitrogen is 87％.Seaweed extract can replace glucose as a carbon source to maintain the efficient operation of the reactor.The mechanism study shows that SMX is converted into 3-amino-5-methyl isoxazole and p-amino benzenesulfonamide by side chain amination,the latter is desulfurized into aniline by the 4S pathway and further degrades into CO2 and H2O.Maribacter,Winogradskyella and Roseibium may be potential SMX-degrading bacteria.The study provides a new strategy for the simultaneous removal of antibiotics and nitrate nitrogen from mariculture wastewater.