在极其氧气有限的环境中,Comammox而不是AOB主导了高效的自缩化-脱过程
Yu Xiang1, Xiaoming Song2, Yilin Yang2
1School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, PR China; School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 611756, PR China; School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, PR China.
Water research
|October 9, 2024
概括
完全氨氧化剂 (comammox) 在氧气有限的自缩化-脱化 (OLAND) 过程中起着关键作用. 这项研究表明,comammox细菌与其他微生物一起,在低氧条件下有效地去除.
科学领域:
- 环境微生物学环境微生物学
- 生物地质化学循环 生物地质化学循环
- 污水处理 污水处理 污水处理
背景情况:
- 发现完整的氨氧化剂 (comammox) 改变了对化的理解.
- 康马莫克斯在氧气有限的自营化-脱化 (OLAND) 过程中的特定作用需要进一步研究.
研究的目的:
- 在极低溶解氧条件下的OLAND过程中调查comammox细菌的功能.
- 在一个由comammox主导的OLAND系统中评估去除效率和微生物社区动态.
主要方法:
- 在0.05 mg/L溶解氧环境中使用以comammox为主导的细菌实现了OLAND.
- 应用伪一级和二级运动模型来分析氨去除.
- 利用16S rRNA基因测序和元基因组学来描述微生物群落和代谢途径.
主要成果:
- 实现了>97%的氨去除和71%的总去除,使用碳酸作为碳源.
- 在低负荷和高负荷下确定了不同的氨去除路径,分别适合伪第一和二阶模型.
- 揭示了comammox细菌与anammox和异质脱剂共存,参与横向基因转移以适应.
结论:
- 在OLAND工艺中,comammox细菌,anammox和异质脱剂对于高效的去除至关重要.
- 这些发现提供了关于微生物适应和在低氧环境中的能量代谢的见解.
- 这项研究为减少自营去除系统中的通风能提供了一个参考.
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