有机碳源激发细胞外聚合物物质,以促进混合型系统中的Fe0介导的自化脱
Zheng Wang1, Binxue Song1, Lei Xu1
1College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Chemosphere
|July 2, 2023
概括
添加有机碳可以增强废水处理中的自和异脱. 这通过促进通过细胞外聚合物物质的电子转移来促进去除,从而改善Fe0介导的过程.
科学领域:
- 环境科学 环境科学
- 环境工程环境工程
- 微生物学 微生物学
背景情况:
- 由于Fe0腐蚀的铁氧化物形成,Fe0介导的自身化 (DNA) 的效率下降.
- 混合性脱 (MDN),结合ADN和异质性脱 (HDN),提供了一个潜在的解决方案,以维持Fe0介导的ADN性能.
- 在从有机缺陷二次废水中去除时,高和Fe0介导的DNA之间的相互作用需要进一步研究.
研究的目的:
- 为了研究增加影响COD/NO3--N比率对混合型脱系统中的去除效率的影响.
- 阐明外部碳来源影响Fe0介导DNA和HDN之间的相互作用的机制.
- 评估细胞外聚合物 (EPS) 和可溶微生物产品 (SMP) 在增强脱化中的作用.
主要方法:
- 实验设置涉及混合性脱化,具有不同影响力的COD/NO3-N比率.
- 监测总 (TN) 和酸 (NO3--N) 的去除效率.
- 细胞外聚合物物质 (EPS) 的分析,包括蛋白质 (PN) 和湿酸 (HA) 含量,以及手术后Fe0表面的表征.
主要成果:
- 将COD/NO3-N比率从0.0提高到1.8-2.1显著提高了TN去除效率.
- 增强的碳源同时促进DNA和HDN,而不会抑制DNA.
- 增加的EPS,特别是PN和HA,通过加速电子转移和形成生物有机-Fe复合体,促进了Fe0介导的DNA中TN和NO3-N的去除.
结论:
- 外部碳来源有效地增强了有机缺陷的二次废水中的高基和Fe0介导的ADN.
- EPS和SMP在促进Fe0介导DNA的电子转移方面发挥着至关重要的作用,从而改善了去除.
- 这些发现为优化高效的MDN系统提供了宝贵的见解,用于处理具有有限有机含量的二次废水.
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