This project proposes a better method for the sewage treatment control system with a wide distribution range and a complex layout. Using Mitsubishi Q series PLC and other equipment and GPRS wireless communication technology, a GPRS-based IoT terminal sewage treatment network control system is built. Realized wireless remote multi-level monitoring? The project can run normally in practical applications, with stable and reliable performance, friendly and intuitive monitoring interface, and easy operation? The application of this wireless sensor network makes the automatic control system more practical and flexible ? This is also the embodiment and application of a concept of Internet of Things?
1 Introduction
In the traditional sewage treatment industry, there have always been scattered monitoring nodes and limited wired network data transmission. Sewage treatment is an additional industry for industrial production. It is important to improve production efficiency, reduce engineering costs, and realize remote monitoring, fewer people or even no supervision. What is the significance? Apply GPRS technology with wider network coverage and more convenient network connection to the sewage treatment monitoring system, integrate with the sensors on the industrial site, fundamentally solve the original problem, and realize remote real-time monitoring on the industrial site?
2 Introduction to GPRS technology
GPRS (General Packet Radio Service), a general wireless packet service, is a wireless packet switching technology based on GSM system, providing end-to-end, wide area wireless IP connection? Popularly speaking, GPRS is a high-speed data processing technology , The method is to transfer the data to the user in the form of "grouping"? GPRS is widely used in www browsing, information query, remote monitoring and other fields? GPRS in addition to frequency band, frequency bandwidth, burst structure, wireless modulation standards, frequency hopping The rules and TDMA frame structure are the same as GSM, and also have the following characteristics:
1) High-speed transmission
It can stably transmit large-capacity high-quality audio and video files. In practical applications, GPRS can provide transmission speeds of up to 56 ~ 115 kb / s. The highest theoretical value can reach 171.2kb / s?
2) Always online
When communicating, as long as the wireless channel is available, GPRS can establish a connection; while the user is "online", there is no need to use a dial-up modem to establish a connection.
3) Low price
For the packet switching mode, users only occupy resources during the period of sending or receiving data. Multiple users can efficiently share the same wireless channel, thereby improving the utilization of resources. Billing is based on the amount of data communicated by users? [ 1]
Based on the above technical characteristics, GPRS technology is particularly suitable for intermittent, sudden or frequent small data transmission occasions.
3 Brief introduction of sewage treatment process
Compared with developed countries, China's sewage treatment started late, and the current urban sewage treatment rate is only 6.7%? Combining with China's actual situation and referring to advanced foreign technology and experience, the construction of sewage treatment plants should meet investment savings, reduce costs, and reduce land occupation. Several development directions such as significant nitrogen removal effect and organic combination with modern technology?
The network control system of the sewage treatment plant designed by this project adopts a graded treatment process, which is divided into primary treatment and secondary treatment. The primary treatment uses physical and chemical methods to remove large suspended solids and sand particles in the raw water by means of grid interception and precipitation. For the secondary treatment, biological treatment is used to remove suspended, dissolved organic matter and nutrients such as nitrogen and phosphorus in the raw water through microbial contact oxidation and underwater aeration. The process flow is shown in Figure 3.1.
Figure 3.1 System flow chart.
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