评估水上流速度对浸泡空气过器中化的影响
Saquib Sarosh1, N S Keerthi1, Sreenivasan Ramaswami1
1Centre for Sustainable Technologies, Indian Institute of Science, Bengaluru, Karnataka, India.
概括
水的上流速度不会影响浸泡气化过器 (SAF) 的化率. 这项研究发现,SAFs在各种速度中完全化,即使在高氨加载率下,与生物气化过器不同.
科学领域:
- 环境工程 环境工程
- 水处理技术水处理技术
- 微生物生态学 微生物生态学
背景情况:
- 化对于水资源回收至关重要,通常是速度限制的步骤.
- 包装床生物膜反应器,如生物空气过器 (BAF) 和浸泡空气过器 (SAF),对于高速化是有效的.
- 与SAF不同,BAF面临堵塞和头部损失的问题,促使进一步调查SAF的操作参数.
研究的目的:
- 系统地研究水上流速度对浸泡空气过器 (SAF) 化性能的影响.
- 为了比较SAF性能与生物气化过器 (BAF) 关于水速度影响的现有知识.
- 评估水上流速度对SAFs内生物膜社区结构的影响.
主要方法:
- 在两个试验床上运行了十个化SAF,以五种不同的水上流速度 (每小时1,5,10,15,20米).
- 应用的体积氨加载率 (vALRs) 在长时间 (230天和157天) 中大约在200-2000gN·m−3·day−1和300-1400gN·m−3·day−1之间.
- 监测化效率和分析生物膜社区结构 (多样性,丰富性,主导生物).
主要成果:
- 水上流速度对SAF中化率没有显著影响.
- 在所有测试速度上都实现了几乎完全的化,即使在约2公斤N·m−3·day−1.1的高vALR下也是如此.
- 生物膜社区结构不受水上流速度变化的影响.
结论:
- 水的上流速度不是优化SAF中化的一个关键因素,与BAF的发现相反.
- 在广泛的运行速度和高负载率中,SAF表现出强大的化性能.
- SAF的操作灵活性,独立于水速度对化的影响,使其成为第三级化的一种可靠选择.
相关概念视频
Underflow Gates
458
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
458
Laminar Flow
2.4K
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
2.4K
Rapidly Varying Flow
561
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
561
Conservation of Mass in Moving, Nondeforming Control Volume
1.3K
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
1.3K
Primary Production
25.8K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
25.8K
Turbulent Flow: Problem Solving
468
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
468


