部分化测序批量反应堆中氧化生产和氧胺积累:不同操作策略的比较
Lluc Olmo1, Julián Carrera1, Julio Pérez1
1GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, Ed. Q-Campus UAB, 08193 Bellaterra, Barcelona, Spain.
这项研究表明,在部分化 (PN) 过程中运行具有多个微空气阶段的测序批量反应堆 (SBR) 显著增加了氧化 (N2O) 排放和氧胺积累. 优化通风策略是控制N2O污染的关键.
科学领域:
- 环境科学 环境科学
- 环境工程 环境工程
- 生物技术是生物技术.
背景情况:
- 排序批量反应堆 (SBR) 用于废水处理,但其中的部分化 (PN) 过程可能导致高氧化 (N2O) 排放.
- 了解影响N2O生产和氧胺积累的因素对于减轻这些排放至关重要.
研究的目的:
- 调查不同操作策略对PN-SBR中的N2O生产和氧胺积累的影响.
- 在各种养和通风制度下量化N2O排放因子 (EF) 和净生产率 (N2OR).
主要方法:
- 使用三个不同的策略运行PN-SBR: (I) 单次养与连续通风和一个微空气阶段, (II) 单次养与多个微空气阶段,和 (III) 步骤养与一个微空气阶段.
- 在稳定的运行条件下确定N2O EF和N2OR.
- 在空气化阶段测量氧胺积累.
主要成果:
- 战略II (多个微空气阶段) 产生了最高的N2O排放因子 (13.5%) 和N2OR (85 mg N g-1 VSS d-1),以及最大的氧胺积累 (0.18 mg N L-1).
- 策略I (连续通风,一个微空气阶段) 显示了最低的N2O排放和氧胺积累 (0.01毫克N L-1).
- 在氨氧化率 (AOR),特定N2OR和氧胺度之间发现了强烈的正相关性 (R2 ≥ 0.9).
结论:
- 微空气阶段的分布和时间显著影响PN-SBR中的N2O排放和基胺积累.
- 促进氧胺积累的废水处理策略,就像具有多个微空气阶段的废水处理策略一样,也会增加N2O排放.
- 需要进一步的研究来优化PN-SBR操作,同时实现高氨去除效率和最小的N2O释放.
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