Study On Prediction And Control Method Of Dissolved Oxygen In The Water Environment

Dissolved oxygen in water is one of the necessary conditions for the survival of aquatic organisms.It is also an important factor to measure the quality of water body and influence the quality of water ecological environment.However,the water environment is complex and changeable,which leads to the uneven distribution of dissolved oxygen in different regions,which is not conducive to the stability and sustainable development of water ecology.The common oxygen concentration in the pond is regulated by the sensor threshold mode.When the detected oxygen is lower than the lower limit,the oxygen increasing machine is started and the oxygen increasing is stopped when the dissolved oxygen is higher than the upper limit.However,it is difficult to get the oxygen to reach the requirement in a short time when it is found that the dissolved oxygen is lower than the minimum threshold.The fish died with anoxia.Therefore,in view of the lag of the dissolved oxygen in the pond,this paper analyzes the detection data and establishes a prediction model of the dissolved oxygen neural network improved by the clustering algorithm.According to the forecast trend of the future change of the dissolved oxygen,the starting and stopping of the aerator is instruct ahead of time to realize the advanced control of the concentration of dissolved oxygen.In order to improve the equilibrium of the horizontal distribution of dissolved oxygen in the pond,this paper adopts a flexible carrier type pump push flow mode,which is more suitable for the treatment of the small artificial landscape water compared to the regular fixed-point and timing aeration device.Aiming at the characteristics of nonlinearity and hysteresis of dissolved oxygen control system,a fuzzy PID controller is designed to achieve accurate control of water pump flow.Finally,a comprehensive control strategy for dissolved oxygen is proposed,and an expert system for dissolved oxygen is described.In order to give full play to the mobility of the plug flow pump,the cruise detection and local push strategy are adopted to achieve precise control of dissolved oxygen in water body.At the same time,combining the expert opinion,making the push flow strategy according to the environment conditions,the control of the dissolved oxygen in the pond is more in line with the practical experience,and the control of the dissolved oxygen is more reasonable.