Research and Implementation of Landfill Leachate Control System

Domestic waste is mainly treated by sanitary landfill. Leachate will be produced during sanitary landfill. The main characteristics of landfill leachate are high concentration of COD and BOD, high ammonia nitrogen content, high levels of refractory organics, heavy metal ions, unstable water quality and so on. With the increasing difficulty of leachate treatment, traditional manual or semi-automatic treatment methods can not meet the requirements. In order to ensure the water quality, the requirement of the leachate treatment to automation is increasing. According to the actual operation of sewage treatment plant, a set of treatment processes has been worked out. According to the characteristics and control requirements of landfill leachate processing technology, a landfill leachate processing control system is designed, which is controlled by PLC automatic control, realtime monitoring of Kingview and communication network to realize data exchange. Due to the wide range of leachate water quality changes, the traditional PID control method has poor control precision and the parameters are difficult to adjust online. Therefore, a PID control method based on adaptive control strategy has been proposed and designed. By using the nonlinear mapping ability and learning ability of neural network, the PID parameters can be adjusted online, and the final effluent quality can meet the discharge standard.