市政给排水工程管道内污染物迁移转化效应仿真分析

为了保障管道稳定运行、城市水体及生态的安全健康,针对市政给排水工程管道内污染物迁移转化效应展开仿真分析。设计给排水工程管道仿真模拟装置,以城市污水作为模拟管道装置的进水,在设定的实验条件下,通过所设置的取样方法提取水样与泥样,并运用相应的测定方法对取样的有机污染物、氮类污染物、磷类污染物各指标实施监测。结果表明:管道污水内的有机污染物TCOD和SCOD在经过15 h循环流动后同初始含量相比,分别降低22.96%与27.00%,而沉积物内TCOD含量与稳定初期相比,在历经70 d循环流动且稳定后提升了18.70%;管道沉积物内的氮、磷类污染物在管道汇流区域内壁处的含量最高,在汇流后区域的含量最低,且在干管流速不变、支管流速增加的情况下,汇流前区域与汇流区域内壁处的氮、磷类污染物含量有所升高,汇流后区域氮、磷类污染物含量有所降低。

In order to ensure the stable operation of the pipeline and the safety and health of urban water body and ecology,the simulation analysis is carried out for the migration and transformation effect of pollutants in the municipal water supply and drainage pipeline.The simulation device of water supply and drainage pipeline is designed.The urban sewage is taken as the influent of the simulation pipeline device.Under the set experimental conditions,the water and mud samples are extracted by the set sampling method,and the corresponding determination methods are used to monitor the indicators of organic pollutants,nitrogen pollutants and phosphorus pollutants.The results showed that the contents of TCOD and SCOD in the pipeline sewage decreased by 22.96%and 27.00%respectively after 15 hours of circulating flow,while the contents of TCOD in the sediment increased by 18.70%after 70 days of circulating flow and stabilization compared with the initial stage of stabilization.The contents of nitrogen and phosphorus pollutants in the pipeline sediment were the highest in the inner wall of the pipeline confluence area,and lowest in the post-confluence area,and under the condition of constant flow rate of the trunk pipe and increasing flow rate of the branch pipe,the content of nitrogen and phosphorus in the pre-confluence area and the inner wall of confluence area increased,while the content of nitrogen and phosphorus in the post-confluence area decreased.