Automated solutions for sewage treatment

1. Preface
At present, the design and implementation of the automation system in sewage treatment plants in our country are in a period of growth. There are still some imperfections in the system's requirements, design, structure and control. The comprehensive sewage automation system solution provides services for the construction and operation management units of sewage treatment plants. This comprehensive automation system solution not only ensures the stability and efficiency of the sewage treatment plant's production, reduces labor intensity, and improves the operating environment, but also enhances the modern production management level of the sewage treatment plant. Based on a full consideration of the characteristics of the sewage treatment process, it integrates the concept of building a modern sewage treatment plant into the design of the automatic control system.

2. Composition of the automatic control system
The automatic control system of a sewage treatment plant consists of three parts: field instruments and actuators, signal acquisition and control, and human-machine interface (monitoring) equipment. The construction of an automatic control system mainly refers to the selection of three parts: system form and equipment. This actuator is mainly determined by the process specialty according to the requirements of the process, and the interface of the automatic control system is reserved. The selection of instruments will be described in the following section. The signal acquisition and control section mainly includes the selection of the basic control system and the choice of control equipment and necessary communication networks after the system is determined. The human-machine interface mainly refers to the selection of monitoring equipment in the central control room and the on-site duty room.

3. Process flow and system implementation functions
The sewage treatment process is divided into three levels: Primary treatment: Physical treatment, which removes stones, sand, fat, grease and other substances contained in the sewage through mechanical treatment such as grilles, sedimentation or air flotation. Secondary treatment: Biochemical treatment, where pollutants in the sewage are degraded and converted into sludge under the action of microorganisms. Tertiary treatment: Advanced treatment of sewage, which includes the removal of nutrients and disinfection of sewage through chlorination, ultraviolet radiation or ozone technology. Depending on the treatment objective and water quality, some sewage treatment processes may not include all of the above processes.
Main functions: This control system combines automatic control technology with intelligent monitoring and management technology, and is developed based on the process control concept of sewage treatment plants. It aims to achieve energy conservation and consumption reduction to the greatest extent while ensuring the stable operation of sewage treatment plants.