无氧颗粒污泥反应堆的CFD模拟:一项审查
Camila D' Bastiani1, David Kennedy1, Anthony Reynolds2
1School of Mechanical Engineering, Technological University Dublin, Bolton St, Dublin 1, D01 K822, Ireland.
Water research
|June 24, 2023
概括
计算流体动力学 (CFD) 模型对于理解无氧消化系统中的沼气产生至关重要. 本综述批判性地分析了无氧颗粒污泥反应堆 (AGSR) 中的CFD应用,强调了当前的挑战和未来的研究方向.
科学领域:
- 环境工程 环境工程
- 生物技术是生物技术.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 无氧消化 (AD) 产生生物气,一种可再生能源,同时处理有机废水.
- 在AD系统中生产生物气体对内部混合条件敏感.
- 高速反应堆,如上游无氧污泥毯 (UASB),扩展颗粒式污泥床 (EGSB) 和内部循环 (IC) 反应堆,表现出由废水,沼气和生物质相互作用影响的复杂水力学.
研究的目的:
- 为了提供计算流体动力学 (CFD) 应用在无氧颗粒污泥反应堆 (AGSRs) 中的全面审查.
- 批判性地讨论对AGSR的CFD建模的最新情况,包括建模方面,模拟方法和验证方法.
- 确定AGSRs的CFD建模中的当前挑战和未来研究前景.
主要方法:
- 用CFD来建模AGSRs的研究论文的文献综述.
- 对各种CFD建模方法进行批判性分析,包括单相和多相模拟.
- 在AGSRs的背景下讨论用于验证CFD模型的方法.
主要成果:
- CFD已被广泛用于研究各种AGSR的水力动力学行为.
- 提出了对不同建模策略 (例如,单相与多相) 的批判性分析,以及它们对AGSR的适用性.
- 审查和讨论了各种CFD模型验证技术.
结论:
- CFD 是理解和优化 AGSR 性能的一种强大工具.
- 确定了对AGSRs的CFD建模的当前知识和未来研究方向的差距.
- 需要进一步的研究来完善CFD模型,以便更准确地预测生物气发电和反应堆效率.
相关概念视频
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:29Bioreactor Design and Operational System
Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
01:18Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...