当前位置: X-MOL 学术Environ. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Performance and bacterial community of bio-electrochemical system treating simulated domestic wastewater containing low concentration of cephalosporin antibiotics
Environmental Technology ( IF 2.8 ) Pub Date : 2020-08-18
Ruijie Guo, Xin Xu, Zhirong Sun, Xiang Hu

This study investigated the effects of five cephalosporin antibiotics (ceftazidime, ceftriaxone, cefdinir, cefixime and cefepime) on performance and bacterial community structure in bio-electrochemical systems (BES) and sequencing batch biofilm reactor (SBBR). The results showed that the external electric field had no significant effect on the removal of COD and ammonia nitrogen in water. The removal rates of five antibiotics in BES increased by 28.5%, 20.0%, 9.1%, 21.0%, and 11.5%, respectively. High-through sequencing showed that microbial membrane-growing process increased species diversity, and antibiotics had a significant inhibitory effect on the initial biofilm of the reactor. As time progressed, the inhibitory effect was weakened, and the microorganism were tolerated and re-enriched. The increase in the type and concentration of antibiotics and the applied electric field had a significant effect on the microorganisms in the reactor. The dominant microorganisms for antibiotic removal in the SBBR were Luteococcus, Cloacibacterium, Dysgonomonas, and Ottowia. The dominant bacteria in the BES were Ottowia and Tahibacte. The abundance of these strains increased significantly during antibiotic acclimation. The abundance of Ottowia, Tahibacter, and Nakamurella were significantly higher than SBBR. Thus the BES system had a good antibiotic degradation effect. The BES can effectively treat simulated domestic sewage containing multiple antibiotics, laying a theoretical foundation for the actual wastewater treatment.

Highlights

  • Compared with SBBR, BES can improve removal rate of 5 cephalosporin antibiotics by 9.1% -28.5%.

  • The addition of antibiotics caused large fluctuations in ammonia nitrogen removal in SBBR and BES.

  • The concentration and kind of antibiotics can affect the community structure of microorganisms.

  • Compared with SBBR, BES improves the abundance of Ottowia, Tahibacter and Nakamurella.



中文翻译:

生物电化学系统处理低浓度头孢菌素类抗生素生活污水的性能和细菌群落

本研究调查了五种头孢菌素抗生素(头孢他啶,头孢曲松,头孢地尼,头孢克肟和头孢吡肟)对生物电化学系统(BES)和测序生物膜反应器(SBBR)的性能和细菌群落结构的影响。结果表明,外电场对水中COD和氨氮的去除没有显着影响。BES中五种抗生素的去除率分别提高了28.5%,20.0%,9.1%,21.0%和11.5%。高通量测序表明,微生物膜的生长过程增加了物种的多样性,抗生素对反应器的初始生物膜具有显着的抑制作用。随着时间的流逝,抑制作用减弱,微生物被耐受并重新富集。抗生素类型和浓度的增加以及所施加的电场对反应器中的微生物有重大影响。SBBR中用于去除抗生素的主要微生物是黄球菌支气管杆菌DysgonomonasOttowia。BES中的优势细菌是OttowiaTahibacte。在抗生素适应过程中,这些菌株的丰度显着增加。OttowiaTahibacterNakamurella的丰度明显高于SBBR。因此,BES系统具有良好的抗生素降解作用。BES可以有效地处理含多种抗生素的模拟生活污水,为实际废水处理奠定了理论基础。

强调

  • 与SBBR相比,BES可以将5种头孢菌素抗生素的去除率提高9.1%-28.5%。

  • 抗生素的添加导致SBBR和BES中氨氮去除的较大波动。

  • 抗生素的浓度和种类会影响微生物的群落结构。

  • 与SBBR相比,BES可提高OttowiaTahibacterNakamurella的丰度。

更新日期:2020-08-18
down
wechat
bug