تأثير شکل کانال در تخليه سطحي جريان چگال از دو مقطع مستطيلي و ذوزنقهاي در محيطهاي ساکن و همگن
Journal Title: آب و فاضلاب - Year 2018, Vol 29, Issue 2
Abstract
The Impact of Channel Shape at Surface Discharge from Rectangular and Trapezoid Sections into Stagnant and Non-stratified Water Bodies In recent years, with growing population and industrialization of the world, desalination techniques have developed drastically to supply the rising needs of coastal cities to fresh water. The brine is the second product of the producing fresh water process in the desalination facilities, that is usually discharged into the sea through marine outfalls (surface and submerged). The main purpose of the outfall is to enhance the dilution and reduce the impact on the local environment. In this study, in order to investigate the impact of the shape of the surface discharge channel, rectangular and trapezoidal sections with the equivalent diameter were used to discharge wastewater with negative buoyancy into stagnant and non-stratified water bodies. Experiments have been carried out in a dark room and processed using digital analysis. The location of plunge point, impact point and the dilution in this point, and the location of the ultimate point and dilution at this point were the flow characteristics studied in this research. According to the shape impact and less hydraulic conflict with the surroundings, trapezoidal section had better geometric characteristics compared to rectangular section. Results of the experiments were presented in the form of non-dimensional diagrams and equations. Finally, statistical indices such as Root Mean Square Error (RMSE) and R-Square (R2) were used to verify the accuracy of the presented dimensionless equations. The results indicated that the closer the shape of surface channel discharge is to the best hydraulic cross section (semicircular), the better geometric and mixing characteristics would be obtained for the flow along near-field area. In this way, prediction of flow characteristics and design of actual samples of these outfalls will be possible.
Authors and Affiliations
Fatemeh Shacheri, Aziz Abessi, Jamal Mohammadvali Samani, Mohsen Saeedi
Preparation and Characterization of Magnetic Chitosan/-Carrageenan Nanocomposite and its Application for Removal of Eriochrome black-T from Aqueous Solutions تهيه و بررسي نانوکامپوزيت مغناطيسي کيتوسان/کاپا-کاراگينان و کاربرد آن در حذف رنگ اريوکروم بلاک تي
Abstract Due to the non-biodegradability of some dyes especially water soluble dyes, dye can pollute surface and groundwaters. Subsequently, discharging dye-contaminated wastewaters in the environment can endanger the h...
اندازهگيري نيترات در محيطهاي آبي به وسيله نانو حسگر الکتروشيميايي ساخته شده بر پايه کامپوزيت گرافن اکسايد/ نانوسلولز- نانوذرات نقره Measurement of Nitrate Concentration in Aqueous Media Using an Electrochemical Nanosensor Based on Silver Nanoparticles-Nanocellulose/Graphene Oxide
Measurement of Nitrate Concentration in Aqueous Media Using an Electrochemical Nanosensor Based on Silver Nanoparticles-Nanocellulose/Graphene Oxide M. Shadfar1, R. Mohmmadali Tehrani2, F. Hooshyar1 1. MSc in Analytica...
تأثير زمان ماند هيدروليکي بر عملکرد بيوراکتور غشايي در تصفيه فاضلاب شهري Effects of Hydraulic Retention Time on the Performance of a Membrane Bioreactor Treating Municipal Wastewater
Effects of Hydraulic Retention Time on the Performance of a Membrane Bioreactor Treating Municipal Wastewater H. Falahati Marvast1 , A. Karimi Jashni2, Gh.R. Rakhshandehroo3 1. PhD Student of Civil and Environmental En...
ارائه شاخص قابليت اطمينان جديد براي ارزيابي عملکرد شبکه توزيع آب A New Reliability Index for Evaluating the Performance of Water Distribution Network
Various reliability indices have been defined by researchers for the water distribution networks. Due to the complexity and heterogeneous nature of distribution networks, results of indicies can vary substantially and mu...
کارايي نانولولههاي کربني تک ديواره پوشيده شده با ذرات اکسيد روي در حذف آلاينده BTEX از محلولهاي آبي
Investigation of BTEX Removal from Aqueous Solution by Single Wall Carbon Nanotubes Coated with ZnO Monoaromatics of Benzene, Toluene, Ethyl Benzene and Xylene which are abbreviated as BTEX, are among the most important...