在市政废水处理中,酸剂量与扩散通风的结合
Tero Luukkonen1, Anne Heponiemi2
1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 8000, FI-90014, Oulu, Finland
概括
甲酸 (PAA) 通过改善氧气转移,特别是低剂量时,增强废水通风. 这样可以减少空气输入,节省成本,并提供消毒等额外的好处.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 化学氧化过程中的化学氧化
背景情况:
- 废水通风对于处理过程中的微生物氧气供应至关重要.
- 优化氧气传输效率是有效和经济的废水处理的关键.
- 乙酸 (PAA) 是一种消毒剂,可能对空气产生次要影响.
研究的目的:
- 研究 peracetic acid (PAA) 剂量对废水通风效率的影响.
- 分析气泡大小的变化,氧气转移和溶解氧的演变.
- 评估使用PAA降低通风能耗的潜力.
主要方法:
- 评估不同PAA度的氧气转移系数.
- 使用视觉方法观察泡大小动态.
- 从PAA和过氧化分解中监测溶解氧的演变.
- 进行连续的实验室级空气化实验,使用初级废水.
主要成果:
- 使用PAA,氧气转移系数提高到7mg/L,这归因于较小的气泡和分解驱动的氧气释放.
- 较高的PAA度 (>7 mg/L) 显示效率降低,可能是由于质量转移阻力增加.
- 连续的PAA剂量 (1 mg/L) 可以减少54%的空气输入,同时保持溶解氧水平.
结论:
- PAA可以显著提高废水通风效率,降低能源需求.
- 最佳的PAA剂量对于平衡益处与潜在的质量转移阻力至关重要.
- 在气化砂清除等过程中PAA的应用提供了空气增强,消毒和气味控制的组合.
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