电子竞争和pH因子相互作用的建模改善了在脱化过程中酸盐积累的认知
Xuehai Yue1, Fengjun Yin2, Hao Tan1
1Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; University of Chinese Academy of Sciences, Chongqing School, Chongqing, 400714, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
电子竞争 (EC) 在脱过程中显著影响亚酸盐 (NO2-) 生产,特别是在近中性pH条件下. 了解EC和pH压力相互作用是优化生物去除过程的关键.
科学领域:
- 环境微生物学环境微生物学
- 生物化学工程是生物化学工程.
- 水处理技术水处理技术.
背景情况:
- 在脱过程中酸盐 (NO2-) 的产生受到电子竞争 (EC) 和pH压力的影响.
- 这些因素在整个pH频谱中的相互作用和主导地位仍然不太清楚,这阻碍了过程优化.
研究的目的:
- 开发和验证一个简洁的电子竞争抑制 (ECI) 模型.
- 阐明EC和pH压力对NO2-生产的不同贡献.
- 为了表征脱动力学和pH取决于降解率.
主要方法:
- 进行了批量测试,以表征脱化动力学.
- 一个电子竞争抑制 (ECI) 模型被开发和应用.
- 该模型用于确定酸盐 (NO3-) 和酸盐 (NO2-) 减少的速率常数.
- 在pH范围5.0-10.6.6之间建立了减少率的pH依赖关系.
主要成果:
- 该ECI模型准确地描述了NO2-积累在一个广泛的酸盐/酸盐比率范围 (0-9).
- 电子竞争被发现在近中性pH (6.6-9.0) 中主导NO2-生产.
- 在酸性 (5.8-6.8) 和性 (9.1-10.1) 条件下,pH压力占主导地位.
- 特定的NO3-/NO2-和COD/NO3-比率被确定有利于NO2-生产.
结论:
- 该ECI模型有效量化EC效应和pH压力对脱.
- 优化EC和pH条件可以增强用于部分脱的NO2-生产.
- 这些发现为改善生物去除过程提供了动态和静态度策略.
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