Research On Precise Aeration System Of Biological Pool Based On Fuzzy Control

As the country has set stricter standards for environmental protection,especially water resources management,and people’s concepts have improved,governments at all levels have put forward higher requirements for sewage treatment plants.How to improve the sewage treatment plant’s ability to respond to emergencies,reduce energy consumption and save operating costs has become the goal of optimization and improvement of sewage treatment plants at this stage.As the core part of the sewage treatment plant,the optimized operation of the biological pond stage is of great significance to the energy saving and consumption reduction of the sewage treatment plant.In this paper,a sewage plant in Baotou City is the research object.Under the guidance of AMS1,a mathematical model of the second treatment stage of the plant is constructed.At the same time,a fuzzy adaptive PID controller is selected to control the diamond valve on the biological pond.Design a set of accurate aeration system for biological pond,and verify the actual operation effect of the system through experiment comparison.The main research contents of this paper are as follows:(1)This article uses the ASM1 as a reference to construct a mathematical model of the secondary treatment stage of a sewage plant in Baotou,and implements the model in Wincc software using a global C script.The model has a reasonable description of the reaction process and the conversion of each component in the secondary treatment stage of the plant.Realizing this algorithm in Wincc software effectively reduces the cost of software and hardware of the system.(2)Since the main source of dissolved oxygen in the biological pool is blast aeration,the precise control of the diamond valves on each air corridor in the biological pool is of great significance for controlling the dissolved oxygen content in the biological pool.This article combines fuzzy control theory and PID controller to form a fuzzy adaptive PID controller.At the same time,a pressure gauge is installed on the air manifold,the set pressure remains unchanged,and the PID controller is used for control.The fuzzy adaptive PID controller algorithm is also implemented in Wincc software using global C scripts.(3)In terms of hardware selection,the system mainly uses PLC as the control device.At the same time,an online detection instrument is installed on the biological pool to detect the current state of the biological pool and provide necessary data for the operation of the system.(4)The experimental results show that the system can effectively improve the operating efficiency of the sewage treatment plant,the effluent water quality is less affected by the influent water quality,and the cost of the blast and aeration stage is reduced by about 9%.According to the factory settings According to the calculation of the water intake,the annual operating cost of the blast and aeration stage is reduced by about 143,000 yuan.