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I. Overview
Water quality monitoring is an important foundation for water resources management and protection, and an important means to protect the water environment. In the new century, facing the current situation of flood threats, water shortages, and serious water pollution, my country’s water quality monitoring work is facing brand-new content. The distribution of water resources in my country is unbalanced, the problem of water quality-type water shortage is serious, and there are many water transfer projects across river basins. The development, utilization and protection of water resources have put forward higher requirements for water quality monitoring, which also makes water quality monitoring more special: Water rights transactions and water consultations between countries are also inseparable from water quality monitoring data. Water pollution is mainly reflected in the following figure:
At present, the monitoring of water environment in most areas of my country is mainly based on chemistry. That is, manual regular (or irregular) on-site sampling, testing, and water quality analysis. This kind of workload is large and random, and cannot accurately reflect the change process of the entire water quantity and quality, and therefore cannot obtain a reliable basis for sewage treatment. At present, the water quality monitoring on the market is mainly based on wired deployment, which brings a lot of inconveniences, such as damage by criminals and inability to wire in special environments. In the prior art, data is collected by general-purpose equipment, such as a single-channel analog voltage test using a general-purpose instrument FLUKE8845A. Therefore, it is necessary to write additional control software, which is not only expensive, but also has low system reliability.
Shenyang Kaitai Technology Co., Ltd. has developed a water quality monitoring system based on the application of RFID technology after thorough investigation and inspection. The system overcomes the shortcomings of the prior art and provides a multi-channel data acquisition device that uses a field programmable logic array (FPGA) to control the A/D chip to achieve data acquisition, which greatly improves the sampling accuracy and system reliability, and greatly reduces the cost. The system can monitor the PH value, DO, temperature, conductance and discharge flow of sewage from the sewage outlet in real time, and transmit the collected data to the monitoring center and environmental management department through the WiFi wireless network. The staff can be in the monitoring center or office Carry out remote monitoring, monitor water quality at any time, and get real-time data reports.
2. System composition and working principle
System structure diagram:
The system is mainly composed of various water quality testers and electrodes, WiFi-based data acquisition tags, tag systems, and WLAN wireless networks. The tester obtains water quality data in real time through electrodes placed in the water. The WiFi tag collects data from the tester wirelessly and sends the data back to the system through the wireless network. The tester can then call the real-time data in the system to analyze the water quality. The collected data is processed and stored by the label system server.
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