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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >Design methodology for sewage water treatment system comprised of Imhoff's tank and a subsurface horizontal flow constructed wetland: a case study Dakhla Oasis, Egypt
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Design methodology for sewage water treatment system comprised of Imhoff's tank and a subsurface horizontal flow constructed wetland: a case study Dakhla Oasis, Egypt

机译：Design methodology for sewage water treatment system comprised of Imhoff's tank and a subsurface horizontal flow constructed wetland: a case study Dakhla Oasis, Egypt

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In this study, in order to reuse the treated wastewater in irrigation in rural areas, a new sewage water treatment system comprised of primary treatment Imhoff's tank, Hama drying basins, inlet well, a subsurface horizontal flow constructed wetland (HSFW), water control device, and a groundwater tank is proposed and designed in Dakhia Oasis western desert of Egypt. The proposed system serves a population of 5000 capita with a designed discharge of 750 m~3 d~(-1). The kinetic parameters involved macrophyte organisms, media forms, water level, hydraulic retention time (HRT), and hydraulic loading rate (h_l) for the system were selected to achieve an efficient wastewater treatment system design. Imhoff's tank is sized as the primary sedimentation efficiency is 30%, and HSFW is sized based on the first-order kinetics (k-C*) model, and total hydraulic design theory. The air temperatures were 29.7℃ and 13.8℃ in summer and winter respectively, influent pollutant concentrations after primary sedimentation for BOD, fecal coliforms (FC), total nitrogen (TN), and total phosphorus (TP) were 210mg L~(-1), 10~8 CFU100mL~(-1), 30 and 7mg l~(-1), respectively. The expected designed effluent BOD and FC were 30mg L~(-1) and 1000 CFUl00mL~(-1) respectively. The results show that FC removal controls the area of the HSFW (2.87 ha), 6 units of reed (Phragmites Australis and Papyrus) plants each one is 66 × 72.6 m with h_l of 2.6cm d~(-1) and HRT of 6.91 d. The expected overall removal efficiencies for BOD and FC were 85.7%, and 99.9% respectively.

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