ABSTRACT

To treat degraded agricultural wastewater due to non-point pollution source in cultivated area (Tina Plain), Egypt, a wetland system within branch drain network was proposed and designed, which consists of a sedimentation pond followed by four vegetated bed cells of reed (Phragmites australis), and an open water disinfection zone. The relaxed tank in series model was used to design the wetland. The model input data were influent flow 600 m³ d⁻¹, winter temperature 18 °C, hydraulic retention time 5.8 d, influent pollutant concentrations 500, 300, 480, and 20 mg L⁻¹ for TSS, BOD, COD, and TN, respectively, and 100,000 MPN 100 mL⁻¹ for FC. Results show a wetland system area of 0.078, 0.24, and 0.3 ha for sedimentation pond, vegetated reed bed cells, and disinfection zone, respectively. The expected removal efficiencies for TSS, BOD, COD, TN, and FC were 96.4%, 96.2%, 95%, 75%, and 97%, respectively. The wetland hydrology was computed using local climate data and FAO-CROPWAT 8 model. The proposed wetland area was compared with literature to show its feasibility for wetland operation conditions. The proposed system met the allowable limits of Egyptian environmental regulations, simple construction, operation, and has a low construction cost of one UDS m⁻²

摘要

为处理埃及耕地（蒂娜平原）因面源污染而退化的农业废水，提出并设计了一种带支管排水管网的湿地系统，该系统由一个沉淀池和四个芦苇（芦苇）植物床单元组成。australis ) 和开放水域消毒区。湿地设计采用系列模型松弛罐。模型输入数据为进水流量 600 m ³ d ^-1，冬季温度 18 °C，水力停留时间 5.8 d，进水污染物浓度为 500、300、480和 20 mg L ^-1的 TSS、BOD、COD 和 TN , 和 100,000 MPN 100 mL ^-1对于 FC。结果显示，沉淀池、植被芦苇床和消毒区的湿地系统面积分别为 0.078、0.24 和 0.3 公顷。TSS、BOD、COD、TN 和 FC 的预期去除效率分别为 96.4%、96.2%、95%、75% 和 97%。湿地水文是使用当地气候数据和FAO-CROPWAT 8 模型计算的。将拟建的湿地面积与文献进行比较，以证明其在湿地运营条件下的可行性。该系统满足埃及环境法规的允许限值，施工、操作简单，建设成本低，1 UDS m ^-2