海水养殖废水中磺胺甲噁唑降解及同步反硝化研究

Study of degradation and simultaneous denitrification of sulfamethoxazole in mariculture wastewater

中文关键词: 磺胺甲噁唑  反硝化  海藻提取物  海水养殖废水

英文关键词: sulfamethoxazole  denitrification  seaweed extract  mariculture wastewater

中文摘要:

      传统海水养殖废水处理工艺对抗生素和硝氮处理效率低且运行成本较高．以典型抗生素磺胺甲噁唑(sulfamethoxazole，SMX)为研究对象，海藻提取物为外加碳源，构建移动床生物膜反应器，实现SMX降解及同步反硝化．结果表明，在进水碳氮比为2∶1、水力停留时间为24 h时，SMX平均去除率为76%，硝氮平均去除率为87%，海藻提取物可以替代葡萄糖作为碳源维持反应器的高效运行．机理研究表明，SMX通过侧链氨基化生成3-氨基-5-甲基异噁唑和对氨基苯磺酰胺，后者通过4S途径脱硫生成苯胺并进一步降解为CO2和H2O；海杆菌属、维诺格拉斯基氏菌属和玫瑰色菌属可能是潜在的SMX降解菌．该研究为海水养殖废水中抗生素和硝氮同步去除提供了一种新策略．

英文摘要:

      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.