过器初级污泥酸性发酵的季节性变化
Elin Ossiansson1, Frank Persson2, Simon Bengtsson3
1VA SYD, Box 191, SE-20121 Malmö, Sweden; Chalmers University of Technology, Dep. of Architecture and Civil Engineering, SE-412, 96 Gothenburg, Sweden.
Water research
|June 21, 2023
概括
废水污泥的环境温度发酵产生挥发性脂肪酸 (VFA) 和可溶性COD. 性能因季节性和温度而异,影响了微生物群落和VFA概况.
科学领域:
- 环境微生物学环境微生物学
- 废水处理技术 废水处理技术
- 生物化学工程是生物化学工程.
背景情况:
- 市政废水处理通常涉及到初级污泥管理.
- 水解和酸性发酵是有机物转化的关键过程.
- 环境温度发酵为节能提供了潜力.
研究的目的:
- 为了评估初级污泥在环境温度下发酵的试点规模.
- 评估挥发性脂肪酸 (VFA) 和营养释放的季节性变化.
- 为了研究发酵过程中的微生物社区动态.
主要方法:
- 用于初级废水处理的旋转带过.
- 过原始污泥 (FPS) 的水解和酸性发酵.
- 一年多的试点规模运行,有控制的保留时间 (RT) 和温度监测.
- 分析VFA,可溶性COD,营养释放和微生物群落结构.
主要成果:
- 平均VFA产量为180±35毫克COD/gVS_in,可溶性COD产量为242±40毫克COD/gVS_in在5dRT和16-29°C时.
- VFA的产量取决于温度 (Θ=1.033±0.005).
- 季节性变化显著影响了酸和酸的生产,而长链VFA保持稳定.
- 微生物群落结构与季节,温度和VFA生产频谱相关.
- 观察到稳定的氨和释放;可溶性COD产量随着RT增加,但体积生产率下降.
- 影响FPS和发酵剂之间的显著微生物群差异,随着RT增加.
结论:
- 环境温度发酵是可行的VFA和可溶性COD生产从初级污泥.
- 温度和季节显著影响发酵性能和微生物群落组成.
- 较长的保留时间提高了可溶性COD产量,但降低了体积生产率.
- 在发酵器内的微生物群落的选择中,Bacteroidota发挥了关键作用.
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