郑杰蓉,汪素芳,赵晓婵,等. 厌氧反硝化体系对磺胺嘧啶的共代谢降解特性[J]. 科学技术与工程, 2020, 20(35): 14760-14766.
Zheng Jierong,Wang Sufang,Zhao Xiaochan,et al.Co-metabolic degradation characteristics of sulfadiazine in nitrate anaerobic denitrifying system[J].Science Technology and Engineering,2020,20(35):14760-14766. |
| 厌氧反硝化体系对磺胺嘧啶的共代谢降解特性 |
| Co-metabolic degradation characteristics of sulfadiazine in nitrate anaerobic denitrifying system |
| 投稿时间：2019-12-25 修订日期：2020-09-02 |
| DOI： |
| 中文关键词: 硝酸盐 厌氧反硝化 共代谢 磺胺嘧啶 降解特性 |
| 英文关键词:nitrate anaerobic denitrification co-metabolism sulfadiazine degradation performance |
| 基金项目:国家自然科学青年基金 (21707099)和山西省应用基础研究计划项目 (201801D221346)资助 |
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| 中文摘要: |
| 为有效去除污水中的磺胺嘧啶(sulfadiazine，SDZ)，本研究通过序批式实验，以乙酸钠(Sodium acetate，NaAc)为共代谢基质，对硝酸盐厌氧反硝化体系中SDZ的降解特性进行研究。结果表明，活性污泥驯化5个月后，88 h内共代谢体系中微生物菌群对SDZ(50 mg?L-1)的降解率可达97.36%，相比于无NaAc存在时提高40.34%，说明NaAc作为额外的电子供体，加速了功能菌群对SDZ的代谢；碳平衡试验表明，88 h内SDZ所贡献的TOC降解率为85.53%，体现出良好的矿化性能；此外，根据中间产物推测出该反应体系中微生物对SDZ的降解途径主要包括SDZ水解,磺胺部分硫的还原,嘧啶部分C-N键的断裂,氨基氧化等；同时高通量测序实验检测出大量脱氮菌和脱硫菌(如Ignavibacterium，Azoarcus，Rivibacter等)，与所推测的代谢路径相吻合；最后对出水生物毒性进行了检测，结果显示周期末反应液对纯种大肠杆菌的生长无生物毒性。本研究结果可为硝酸盐厌氧反硝化体系处理污水中的磺胺类抗生素提供理论依据。 |
| 英文摘要: |
| In order to efficiently remove the SDZ in the sewage, sequential batch experiment was used to study the degradation characteristics of SDZ with sodium acetate (NaAc) as co-metabolic substance in the nitrate anaerobic denitrifying system. The results show that after 5 months’ acclimatization, the removal efficiency of SDZ (50 mg.L-1) in the co-metabolism system reaches to 97.36% in 88 h, that is 40.34% higher than the system without NaAc, which indicating that the NaAc as additional electron donor could accelerate the biodegradation of SDZ. The carbon balance analysis shows that the TOC degradation rate contributed by SDZ is 85.53% within 88 h, which shows an excellent mineralization performance. In addition, according to the measured intermediates, it is inferred that the biodegradation of SDZ in this system mainly included SDZ hydrolyzation, sulfur-reduction of sulfonamide part, cleavage of C-N bond of pyrimidine part, and amino oxidation. Meanwhile, denitrifying bacteria and desulphurizing bacteria, such as Ignavibacterium, Azoarcus and Rivibacter, etc., are detected through the high-throughput sequencing experiments, which are consistent with the predicted metabolic pathways. Effluent biological toxicity experiment indicates that the effluent has no biotoxicity to the growth of pure E. coli. The findings obtained in this work might provide a theoretical basis for the removal of sulfonamides of sewage in the nitrate system. |
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