利用数值模型研究的见解,最大限度地提高单阶段部分化/Anammox颗粒工艺的效率,并平衡微生物竞争
Ahmed Elsayed1,2, Taeho Lee3, Younggy Kim1
1Department of Civil Engineering, McMaster University, Hamilton, Ontario, Canada.
概括
这项研究模拟了无氧氨氧化 (Anammox) 细菌的颗粒化,为高效生长找到最佳条件. 适度的溶解氧和最小的化学氧需求是Anammox细菌成功的关键.
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
- 生物过程建模 生物过程建模
背景情况:
- 颗粒化增强无氧氨氧化 (Anammox) 细菌的生长,这对于限制酸盐氧化细菌至关重要.
- 亚纳莫克斯细菌对操作条件敏感,这给维持足够数量的种群带来了挑战.
- 微生物竞争和大众运输对单阶段部分化/阿纳莫克斯 (PN/A) 工艺产生重大影响.
研究的目的:
- 开发和校准一维稳定状态模型,用于模拟PN/A颗粒.
- 为了研究Anammox生长和颗粒内的质量传输的动力常数.
- 为了确定Anammox细菌高效表现的最佳操作条件.
主要方法:
- 开发和校准一个一维的稳定状态模型.
- 模拟Anammox生长和质量传输的运动常数.
- 关于微生物运动的单因素相对敏感性分析 (RSA).
主要成果:
- 对于Anammox群体来说,最优的溶氧 (DO) 度大约是0.10 mg-O2/L.
- 适度的液膜 (约100微米) 和最小的化学氧需求 (COD) 有利于Anammox的生长.
- 对于Anammox细菌,最大的特定生长速率常数 (μmax) 在0.033到0.10d-1.1之间.
结论:
- 阿纳莫克斯的生长速度主要由其最大特异生长速度常数 (μmax) 控制.
- 亚酸盐度作为一个速度限制因素,由于Anammox和酸盐氧化细菌之间的竞争.
- 了解微生物竞争和大规模运输对于优化单阶段PN/A过程至关重要.
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