To address the issue of reduced biochemical reaction efficiency in wastewater treatment plants located in frigid zones of China during winter, caused by excessively low temperatures of raw sewage, a variable-frequency control strategy based on an adaptive weight particle swarm optimization (PSO) algorithm was proposed. Using a wastewater treatment plant in a northeastern Chinese city as a prototype, with the goal of lowest annual operating energy consumption of the system, the frequency of the sewage pump on the heat source side was optimized for different raw sewage temperatures throughout the year. Simulation runs comparing this system's variable flow rate control scheme with constant flow rate control scheme were conducted. The simulation results demonstrated the effectiveness of the proposed algorithm.
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