洞察SNDPR的颗粒状特征和微生物群落,在一个创新的连续流反应堆中,在不同度的COD中进行分析
Shuai Li1, Sha Zhang1, Dong Li1
1Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing, People's Republic of China.
Environmental technology
|February 3, 2026
概括
在同时化,脱化和除系统中,将化学氧气需求 (COD) 提高到400 mg/L,改善了营养物质的去除和颗粒沉积. 然而,较高的COD水平对颗粒的稳定性产生了负面影响.
科学领域:
- 环境微生物学环境微生物学
- 废水处理工程 废水处理工程
- 生物地质化学循环是什么
背景情况:
- 同时化,脱化和去除 (SNDPR) 颗粒型污泥系统提供高效的营养物质去除.
- 低通风能耗对于可持续的废水处理至关重要.
- 了解化学氧需求 (COD) 对SNDPR系统的影响对于运行稳定至关重要.
研究的目的:
- 在自动内部循环连续流量反应器 (AIC-CFR) 中调查不同COD度对营养物质去除,颗粒特征和微生物群体动态的影响.
- 为了确定在低通风条件下稳定和高效的SNDPR操作的最佳COD水平.
主要方法:
- 使用自动内部循环连续流量反应器 (AIC-CFR) 控制低空气 (0.8 L/分钟,DO < 0.5 mg/L).
- 逐渐增加COD度从300至500毫克/升,每次增加100毫克/升.
- 分析了营养物质去除效率,颗粒沉积特性 (泥体积指数,颗粒完整系数),微生物社区结构 (高通量测序) 和细胞外聚合物质 (EPS).
主要成果:
- 400mg/L的COD度显著提高了总和总去除效率,并改善了颗粒沉积.
- 在500mg/L的COD下,颗粒沉能力和稳定性恶化.
- 增加的COD导致更多的*Methanothrix* (古生物) 和减少的*Thiothrix* (细菌),与污泥特性和EPS相关联.
- 氨氧化古生物 (AOA) 被确定为主要的氨氧化剂,而不是氨氧化细菌 (AOB).
- 在整个实验中, *DPAOs-Pseudomonas* 仍然是占主导地位的属.
结论:
- 优化COD度对于在AIC-CFR系统中平衡营养物质去除效率和颗粒稳定性至关重要.
- 微生物群落的转移,特别是*Methanothrix*和*Thiothrix*之间的平衡,在颗粒稳定性中起着关键作用.
- 该研究提供了AIC-CFR操作的概念模型和低碳颗粒污泥工程的技术支持.
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