关于物理堵塞过程和水平地下流动构建湿地的实践应用的研究
Shuqun Dai1, Ruida Wang2, Jiawei Lin3
1Department of Landscape and Architecture, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China.
Scientific reports
|January 3, 2025
概括
农村人造湿地中的物理堵塞是一个重大挑战. 添加垂直波形显著延长系统寿命,并提高废水处理效率.
科学领域:
- 环境工程 环境工程
- 废水处理技术 废水处理技术
- 农村水资源管理 农村水资源管理
背景情况:
- 解决农村废水排放日益增长的挑战需要有效的分散处理解决方案.
- 物理堵塞是小规模水平潜流人工湿地中的一个重大运营问题,影响水力效率.
- 分散的废水处理系统对于改善农村地区的卫生条件至关重要.
研究的目的:
- 为了研究物理堵塞现象在小规模的水平潜流人造湿地.
- 评估堵塞对这些系统液压效率的影响.
- 提出和验证创新的设计策略,以减轻堵塞和提高性能.
主要方法:
- 在人造湿地系统中对物理堵塞的实验分析.
- 计算流体动力学 - 电放电机械 (CFD-EDM) 数值模拟以模拟堵塞效应.
- 设计和实施一个修改的人工湿地系统的设计和实施,用于农村应用.
主要成果:
- 增加垂直的分歧被认为是有效的设计策略,以打击堵塞.
- 实验结果显示,使用垂直阻隔器完全堵塞系统的持续时间延长了15%.
- 在实施垂直波形设计后,液压效率提高了21%.
结论:
- 垂直屏蔽是通过减轻物理堵塞来延长人工湿地的使用寿命的新有效解决方案.
- 修改后的小规模水平浸水人工湿地系统证明了废水处理的改进,并为更好的农村景观做出了贡献.
- 这项研究为农村地区提供了合理有效的污水处理解决方案,提高了环境质量和公共卫生.
相关概念视频
01:27Laminar Flow
344
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:
344
01:29Gradually Varying Flow
19
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
19
01:26Weir: Problem Solving
19
Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...
19
01:30Typical Model Studies
132
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
132
01:24Rapidly Varying Flow
27
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...
27
01:30Underflow Gates
22
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...
22