合流制排水系统中超声清淤技术的可行性及参数优化实验研究

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中图分类号：TU992.4 文献标志码：A 文章编号：2096-6717（2025）04-0219-07

Experimental study on feasibility and parameter optimization of ultrasonic dredging technology in combined drainage systems

TANG Zhenzhen，MENG Daizong，XU Haolian，ZHU Ruilin，LI Huaizheng （SchoolofEnvironmental Science and Engineering，Tongji University，Shanghai 2lOo92，P.R.China）

Abstract： The presence of large quantities of sediments in urban drainage systems can lead to pipeline blockage and overflow contamination on rainy days. Ultrasound，as a clean physical treatment method，can destabilize sediment aggregates，and thus remove sediment during the dry season to maintain sewer function. To investigate the feasibility and optimal treatment conditions of ultrasonic technology for actual dredging， orthogonal experiments were designed to explore the effectiveness of ultrasonic dredging and the impact of five key factors on ultrasonic dredging. The results showed that the ultrasonic treatment exhibited good effects on improving the pipe siltation，with the shear resistance of sediments （EPS） reduced to 26.4%-91.5% of the control group after ultrasonic action，and a large number of EPS associated with adhesion were decomposed in the pipe sediments. Correlation analysis showed that the damage of EPS was an important reason for the decrease in the scour resistance of the sediments.The order of the impact of five key factors on ultrasonic dredging is： ultrasonic power>probe distance from mud surface>action time > sediment thickness>ultrasonic frequency. The optimal working conditions of ultrasonic dredging are： power 22O W，frequency 50kHz ， processing time 200s ， distance from the sediment surface of 3cm . Explored the variation of dredging effect with sediment thickness，and found that ultrasonic dredging has a good effect on sediment with a thickness of ⩽7cm ， and obviously decayed beyond this range.Based on this， further exploration was conducted on the changes in the properties of sediment along the depth direction after ultrasonic action.

Keywords： sewer sediment； ultrasonic dredging technology； orthogonal experiment； erosion resistance;extracellular polymers

合流制排水系统是城市的核心基础设施，在收集和输送雨水以及家庭和工业废水方面发挥着至关重要的作用[。（剩余12850字）