分析使用N和O同位素分离的完全化性能和反应特性优化
Hong Liu1, Yongzhi Chen1, Weiwei Li1
1Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu, China; School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu, China; Technical Center of Sewage Treatment Industry in Gansu Province, Lanzhou, 730070, Gansu, China.
Chemosphere
|December 2, 2023
概括
双同位素技术揭示了溶解氧和温度如何影响活性污泥中的化. 这种方法优化了高效的酸盐积和稳定的废水处理操作的条件.
科学领域:
- 环境科学 环境科学
- 环境工程 环境工程
- 生物地质化学生物地质化学
背景情况:
- 同位素分离是理解生态系统中循环的关键.
- 有限的研究已经将双同位素技术应用于活性污泥化.
- 优化化性能需要对环境影响有更深入的了解.
研究的目的:
- 研究双同位素技术在活性污泥化中的作用.
- 为了确定溶解氧 (DO) 和温度对化性能的影响.
- 为了优化酸盐积累和脱的条件.
主要方法:
- 在连续培养系统中化细菌的丰富.
- 测试三个溶解氧水平 (0.2-0.4,3-4,7-8 mg/L) 和三个温度水平 (18°C,25°C,33°C).
- 对酸盐 (δ15NNO3, δ18ONO3) 和水 (δ18OH2O) 同位素的分析.
主要成果:
- 两者 δ15NNO3和 δ18ONO3都随着更高的DO和温度而增加.
- 增加的DO减缓了同位素分离;增加的温度减少了N和O利用的变化.
- δ15NNO3:δ18ONO3斜率接近1随着DO (<7 mg/L) 和温度的增加,表明了最佳范围.
- δ18OH2O对酸盐形成有显著的贡献 (74-91%的替代性),显示了DO和H2O的联合作用.
结论:
- 在现场双同位素技术有效优化化环境因素.
- 这些发现指导了活性污泥化系统的稳定运行.
- 为管理复杂的废水化过程提供可靠的基础.
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