固体保留时间调节营养去除在试点规模的无氧-有氧-无毒过程:碳分配模式和微生物见解
Shuohui Shi1, Benzhou Gong2, Xinyun Yao1
1Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
Water research
|December 11, 2024
概括
在无氧-有氧-无氧 (AOA) 废水处理过程中优化固体保留时间 (SRT) 是关键. 20天的SRT增强了营养去除和碳利用,而更长的SRT损害了性能和微生物功能.
科学领域:
- 环境微生物学 环境微生物学
- 水处理工程水处理工程
- 生物地质化学循环的过程
背景情况:
- 无氧-有氧-无氧 (AOA) 工艺为废水处理厂提供了加强的碳和营养去除.
- 过程优化,特别是关于固体保留时间 (SRT),对于扩展AOA系统至关重要.
- 在AOA表现和微生物社区动态中SRT的具体作用尚不清楚.
研究的目的:
- 调查不同的固体保留时间 (SRT) 对试点规模AOA工艺的性能的影响.
- 阐明由SRT影响的潜在机制,包括碳利用和微生物社区转移.
- 为优化在现实世界废水处理场景中的AOA流程设计和运行提供指导.
主要方法:
- 一个试点规模的AOA系统在三个不同的SRT中运行:10,20和30天.
- 对营养物质 (,) 的去除,碳利用和污泥特性进行了全面的监测.
- 使用16S rRNA测序和功能基因分析的微生物社区分析被用于评估微生物反应.
主要成果:
- 20天的SRT (S20) 证明了优越的营养物质去除,包括增强的化,脱化和脱化酸盐去除 (DPR).
- S20优化了碳的保存和细胞内转化,支持营养物质的去除效率.
- 过度的SRT (30天,S30) 导致维护成本增加,污泥腐烂,被动营养释放和微生物功能受损,转向较少专业化的微生物群落.
结论:
- 20天的SRT对AOA过程是最佳的,平衡营养物质的去除,碳利用和微生物社区的健康.
- 扩展的SRTs可能会对AOA性能产生负面影响,原因是蜂成本增加和微生物社区转移.
- 这些发现凸显了SRT在AOA过程设计和操作中发挥的关键作用,以实现有效的废水处理.
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