在较高的C/N比率条件下,藻类生物膜产生较少的微生物衍生溶解有机
Yuexin Yu1, Yuan Lin1, Chengyu Gu1
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, School of Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
Environmental research
|May 20, 2025
概括
藻类生物膜 (AB) 在废水处理过程中有效控制微生物衍生的溶化有机 (mDON) 的释放. 较高的碳- (C/N) 比率可以提高AB.
科学领域:
- 环境微生物学 环境微生物学
- 水处理技术水处理技术
- 营养素循环循环的过程
背景情况:
- 在生物营养去除 (BNR) 过程中,微生物衍生溶解有机 (mDON) 的释放有助于优化,特别是在碳剂量方面.
- 藻类生物膜 (AB) 显示出减轻mDON排放的潜力,但碳与 (C/N) 比率对mDON形成的影响尚不清楚.
研究的目的:
- 研究藻类生物膜 (AB) 在不同废水C/N比率 (1-8) 下的mDON形成和利用中的性能.
- 分析不同C/N比率下关于mDON的AB系统的分子特征和代谢特征.
- 阐明C/N比对藻类-细菌相互作用的影响及其在mDON循环中的作用.
主要方法:
- 在受控的C/N比率下培养藻类生物膜 (AB) 反应器.
- 测量mDON度和总去除效率.
- 冗余分析和网络分析,以评估微生物社区的结构和功能.
- 超基因组分析,以调查在溶解有机 (DON) 代谢中的遗传投资.
主要成果:
- 所有AB反应堆的mDON度保持在1.3 mg/L以下,最初的增加趋势随着C/N比率的上升而下降.
- 在最高的C/N比率 (8),mDON降至0.88±0.08 mg/L (比传统BNR减少50%以上),总去除达到97.19%.
- 主导的藻类和细菌显示出不同的mDON生产/利用模式;较高的C/N比率促进了藻-细菌相互作用的协同作用,增强了不稳定的DON回收和减少了其多样性.
结论:
- 藻类生物膜 (AB) 显示出强大的有效性来控制DON相关的缩,即使在高C/N比率下.
- 较高的C/N比率促进了AB系统内的有益的藻类-细菌协同作用,从而改善了mDON管理.
- 这项研究为C/N比对mDON命运和藻类生物膜系统中的微生物代谢策略的影响提供了新的见解.
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