Optimization and Effectiveness Study of Solar-Powered Intelligent Water Circulation and Reoxygenation Device for Urban Lakes

Abstract

Urban landscape and artificial lakes, key ecological infrastructure, are prone

to eu-trophication and degradation due to pollution sensitivity. Existing reoxygenation technologies have high energy use, poor maintainability, and side effects. This study developed a so-lar-powered intelligent reoxygenation device with a buoy as carrier, in-tegrating above-water (main controller, motor) and underwater (impeller, flow guide, sensors) components. Via mi-cro-lifting technology, it generates horizontal and vertical circulation for exchange and reoxy-genation, with intelligent regulation via closed-loop feedback. Hydrodynamic simulations opti-mized parameters, showing maximum cir-culation at 270 mm impeller diameter (matching pipe diameter), full submersion, and 322 rpm, with tracer particles spreading over 30 m radius to form large-scale 3D circu-lation. Laboratory physical model tests validated the device's water circula-tion effect and its capacity to increase dissolved oxygen (DO) by 2.7 mg/L. Field trials de-mon-strated that under a 10 W power input, the device increases DO by 1.11-1.66 mg/L during the day and 1.05-1.29 mg/L at night. With advantages of low energy consump-tion (powered by solar energy with battery backup for continuous operation), low maintenance costs (avoiding pipeline clogging), and ecological friendliness (no signif-icant adverse impacts on aquatic eco-systems), this device provides an effective tech-nical solution for eutrophication control in urban lakes.