Problems of ensuring hydraulic stability of low-flow rates and self-cleansing velocity in wastewater networks
Keywords:
wastewater network, hydraulic regime, EPA SWMM, flow velocity, self-cleansing, siltation, modeling, Nukus cityAbstract
This paper investigates the problems of ensuring the hydraulic stability of urban wastewater networks under conditions of reduced water consumption and the widespread adoption of water-saving technologies. Using the wastewater system of the city of Nukus as a case study, various flow rate scenarios (100%, and with 30% and 50% reductions) were modeled using EPA SWMM (Storm Water Management Model) software. The simulation results demonstrated that a decrease in wastewater flow leads to flow velocities dropping below the minimum self-cleansing limit (vmin<0.7 m/s), with 58–84% of the pipeline network exhibiting a high risk of siltation and critical stagnation zones. Furthermore, anaerobic processes and hydrogen sulfide (H2S) corrosion caused by low flow velocities and low pipe filling ratios were analyzed, and practical engineering recommendations for network optimization were developed
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