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Recently, the installation project of the energy-saving device for Tank No. 4 in the sedimentation workshop of Haisheng Biology Company was successfully completed. The new device boasts several notable features: it features variable-frequency speed control, which allows for flexible adjustment of the amount of washing liquid added based on fluctuations in feed volume and concentration. This ensures that the slurry reaches an optimal settling concentration, enabling more thorough mixing of the flocculant and thus helping to reduce its consumption effectively ； At the same time, a special liquid extraction structure designed using L-shaped tube technology, combined with an energy-efficient propulsion pump with low head and high flow rate (7.5 KW/h), allows for the direct extraction of the second-stage diluted liquid from the clear liquid layer. This significantly reduces the power consumption of the second-stage dilution pump; as a result, it became possible to eliminate the use of two overflow pumps with a power rating of 30 KW/h and a current consumption of 60 A, thereby achieving energy savings at the source. Based on calculations conducted in the workshop following technical upgrades to the self-pressuring process, this device can help the company save over 150,000 yuan per year in electricity costs, equipment maintenance expenses, and cleaning costs, resulting in significant economic and environmental benefits.