文章摘要
养殖海水中磺胺甲噁唑降解及同步反硝化研究
Study on the degradation and simultaneous denitrification of sulfamethoxazole in mariculture wastewater
投稿时间:2024-03-09  修订日期:2024-03-21
DOI:
中文关键词: SMX  反硝化  海藻提取物  海水养殖废水
英文关键词: SMX  Denitrification  Seaweed extract  Mariculture wastewater
基金项目:国家自然科学基金资助项目(42177375)
作者单位
王朔 大连理工大学 环境学院 
张宇晴 辽宁省河库管理服务中心辽宁省水文局 
王竞* 大连理工大学 环境学院 
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中文摘要:
      传统的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。本研究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降解和同步反硝化。结果表明,在进水碳氮比(TOC:NO3-N)为2:1、水力停留时间为24h时,SMX平均降解率为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,海藻提取物提高了反硝化酶的活性,硝酸盐还原酶和亚硝酸盐还原酶活性分别提高了105%和44%;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。本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. In this study, the typical antibiotic sulfamethoxazole (SMX) was used as the research object, and seaweed extract was used as the additional carbon source to construct a moving bed biofilm reactor to achieve SMX degradation and synchronous denitrification. The results showed that when the influent carbon to nitrogen ratio (TOC: NO3-N) was 2:1 and the hydraulic residence time was 24h, the average degradation rate of SMX was 76% and the average removal rate of nitrate and nitrogen was 87%. Seaweed extract could replace glucose as a carbon source to maintain the efficient operation of the reactor. The mechanism study showed that the activity of denitrifying enzyme, nitrate reductase, and nitrite reductase increased by 105% and 44%, respectively. SMX was aminated into 3-amino-5-methyl isoxazole and p-amino benzenesulfonamide by side chain amination, the latter was desulfurized into aniline by the 4S pathway and further degraded into CO2 and H2O. Maribacter, Winogradskyella, and Roseibium may be potential SMX-degrading bacteria. This study provides a new strategy for the simultaneous removal of antibiotics and nitrate from mariculture wastewater.
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