At present, in most parts of my country, the automation technology level of sewage treatment control system is not high, the safety factor is low, the management method is not good, and the efficiency is generally lower than the global standard. The hydrolytic acidification tank process management, data communication and monitor management methods in the sewage treatment system are the key problems that are urgently needed. The software of the automatic control system for sewage treatment in my country is relatively outdated, the cost of sewage treatment continues to rise, and the water body of the treated wastewater discharged from the sewage treatment plant is not stable. Therefore, how to create a reasonable automatic control system software to improve the actual effect of operation and reduce operation costs, with key practical significance.

1. PLC system software:

PLC is a general term for the computer interface of the program controller. It is used as the control board to solve the system software to maintain the function requirements of the control system. It can also use the software as its upper computer software to connect to the PLC according to the data to carry out real-time monitoring of the processing process. The system has the following characteristics: convenient programming, short development and design cycle time, and easy maintenance. Practical and easy to use. Strong manipulation. Modular design structure, strong expansion ability. Therefore, it is widely used in sewage treatment.

The operating targets of a sewage treatment project in Sichuan include deep water wells, coarse grids, raised fire pump rooms, fine grids, hydrolysis acidification tanks, sludge concentration tanks, blower motor rooms, biochemical reaction tanks, secondary sludge concentration tanks, Ultraviolet disinfection cabinets, water outlets, etc., each important protected area needs to check the main parameters such as liquid level gauge, temperature, and pH.

2. The overall block diagram of the control system:

PLC provides an effective automatic control method for the industrial sewage treatment system

The general block diagram of the electrical equipment control system of the industrial sewage treatment system is shown in the figure, and the PLC is the key control board. According to the key input of the inspection control panel, the input of various controllers, and the input of related analog inputs, the related machine Operation, termination and variable speed manipulation of equipment.

Integrating control requirements and processing technology, this control system combines on-site control and remote operation. Siemens PLCS7-300 server + IM177A + OYES200 series product control module performs data collection and controls centrifugal pumps, gates and other motors on site, and then According to the DP system bus, it communicates with the technical engineer station located in the main control room of the office. The main control room is equipped with an industrial control computer, and the main parameters of each protection area are monitored and remotely operated according to the host computer software developed by KingView.

The process flow chart is as follows:

3. Characteristics of project control system:

1. IM177DPIO expansion control module is selected, which can expand 32 height stations, with strong scalability.

2. OYES200 series PLC products have strong anti-interference ability, and the entire system is stable and reliable.

3. The OYES200 product series is rich in variety, which is convenient for customers to configure and choose models.

4. The self-diagnosing function of system abnormalities can immediately eliminate problems that arise during operation, in order to ensure the reliability of operation.

5. Siemens PLC300 server + OYES200 product series, stable and reliable, high cost performance.

4. Conclusion:

Considering various factors such as environmental protection and irrigation, it is very necessary to treat industrial production sewage. Therefore, a reasonable combination of the current state-of-the-art processing technology, the application of metrological verification automatic measuring instruments, and PLC control technology will provide an effective automatic control method for the current industrial sewage treatment control system.