水力冲洗应用于排水小管径倒虹吸管的效果与优化

Performance and Parameters Optimization of Hydraulic Flushing in Small Diameter Inverted Siphon

为了延长污水管道的使用寿命、减少管道冲洗成本、降低人工养护风险、提高污水管网管理水平,设计了一种水力冲洗小管径倒虹吸管道的方法,并研究了倒虹吸管段流速与污泥沉淀量的关系、蓄水冲洗前后倒虹吸管段流速的变化、拦蓄水量与倒虹吸管段冲洗效果的关系、冲洗频率与倒虹吸管段沉淀量的关系。结果表明,随着流速的增大,污泥沉淀量出现逐渐降低的趋势;随着拦蓄盾拦蓄水位的升高,倒虹吸管段的流速也逐渐增大,超过55 cm时,流速上升趋势变缓;当拦蓄水位在50~55 cm之间时,倒虹吸管段污泥浓度的去除率明显升高,最优拦蓄水位为55 cm;设备的最优冲洗频率为3次/d;自冲洗设备对管道中的漂浮物和悬浮物具有非常好的去除效果。

In order to extend service life of sewage pipelines,reduce pipeline flushing costs and the risk of manual maintenance,and improve the management level of sewage pipelines,a method for hydraulic flushing of small diameter inverted siphon was designed,and relationship between flow velocity of the inverted siphon pipeline and content of sludge sedimentation,variations in flow velocity of the inverted siphon pipeline before and after water storage and flushing,relationship between water storage and flushing performance of the inverted siphon pipeline,and relationship between flushing frequency and sedimentation content of the inverted siphon were explored.With the increase of flow velocity,the amount of sludge sedimentation tended to be a gradual decreasing trend.As the water storage capacity of the intercepting shield increased,the flow velocity of the inverted siphon pipeline gradually increased.When the water level exceeded 55 cm,the flow velocity increased slowly.When the interception water level was between 50 cm and 55 cm,the removal efficiency of sludge concentration in the inverted siphon pipeline increased obviously.Therefore,the optimal water level was 55 cm,and the optimal flushing frequency of the device was 3 times/day.Self-flushing equipment had a very good removal performance on floating and suspended matters in the pipeline.