Sewage pollution source automatic monitoring system application program
I. Project Background
With the development of economy, the amount of sewage discharged in our country has become larger and larger. It has caused serious pollution of surface water, and the environmental quality has been deteriorating. However, the monitoring of water quality of pollution sources and drainage canals still remains at the stage of manual monitoring. With low time coverage and lack of scientific and representative samples, it is difficult to reflect the continuous changes in corporate and municipal wastewater discharge. Countries and provinces and municipalities have increasingly attached importance to the protection of the ecological environment and have continuously strengthened their control over water resources pollution. However, because of the weak awareness of environmental protection and the drive of interests, they have arbitrarily stolen sewage and non-compliance discharges, causing serious environmental pollution. The situation happens from time to time, so investment in monitoring and supervision also needs to increase investment to provide an effective and practical advanced monitoring system and solution. It is very urgent to strengthen the environmental monitoring efforts to establish an online wastewater monitoring system and improve water quality monitoring capabilities. Imperative.
In the sewage treatment monitoring project, many of the required wastewater treatment monitoring systems, unattended equipment or monitoring points, are affected by factors such as topography, climate, and monitoring range, and are not suitable for data transmission methods such as wired communication and wireless data transmission. , And they also have the disadvantages of poor mobility, high cost, poor scalability, and inconvenient maintenance of equipment. China Mobile's GPRS network covers a wide range of areas, with high-speed data transmission and always-on features, with a flexible tariff approach, so that GPRS communication The application of the sewage treatment monitoring system has an unbeatable price/performance advantage.
Second, project analysis
2.1 System Composition
2.1.1 Sewage data collection terminals are mainly divided into three aspects according to the nature of monitoring, surface water stations (river, reservoir and other drinking water), urban sewage treatment plants and industrial pollution sources; the main detection of physical quantities are: flow rate, flow, PH Values, COD, ammonia nitrogen, nitrate, nitrous oxide, total phosphorus, etc.; real-time collection of on-site noise data into intelligent monitoring terminals. Transmission through the industry-wide MODIBUS standard protocol.
2.1.2 Wireless transmission equipment In view of the requirements of the communication module, we choose CM550-5XX IP MODEM(dtu). It has a small size, low power consumption, simple configuration and plug and play. Supporting the main and standby data channels, parallel multi-data channels, real-time online and on-demand online multiple working methods, and support for APN network access and other functions not only can guarantee data security and reliability, but also allow customers to save on charges as needed.
2.1.3 Data Management Center Monitoring data receiving subsystem (a critical subsystem in the entire system, it shoulders the role of real-time data monitoring and data reception, has no duty auto work function); data analysis The statistical subsystem (the core part of the monitoring system. It is the part that the user directly operates and feels, and uses the C/S model for the direct operation and use of the staff inside the monitoring department); the alarm short message subsystem (using the currently widely used mobile communication The technical development of a useful function system, the terminal instrument set alarm value and SMS MODEM combination to quickly send the alarm information to the designated management level; WEB release subsystem (sewage automatic monitoring system external The published web search system is a window that provides ordinary citizens with an understanding of the quality of water in a residential city. It is also a requirement for enterprises and factories to monitor their pollution levels.)
2.2 The overall structure of the system Sewage data acquisition terminal through the RS232/485 communication interface and CM550-5XX serial port connection, the data monitoring center can use a variety of ways to connect the network, such as fixed IP, APN, ADSL and so on.
The wireless transmission device CM550-5XX is connected to the remote data center server host through the GPRS network, and opens a transparent data channel after establishing a TCP/IP connection with the center. When the collection terminal needs to report data, the data will be sent directly to the serial port. At this time, the CM550-5XX will send the received data intact to the data center server host. After the command or data sent by the data center is transmitted to the CM550-5XX through the channel, the CM550-5XX is sent to the collection terminal through the serial port, thus achieving bidirectional transparent transmission of data.
2.3 System Implementation Features 2.3.1 Monitoring Data Receiving Subsystem
1. Automatic start (automatic start after power failure/system restart, no manual operation.
2. Data filtering (This system only accepts data that has been authenticated by the system for security reasons).
3. Field detection instruments (digital, analog, numerical, etc.) used for output of various data types.
4. Save the received monitoring data to the back-end database.
5. On-site re-control (by modifying the monitoring acquisition scheme to start the field device (including operation of the automatic sampler, etc.).
6. Check the connection status of each monitoring station
2.3.2 Data Analysis Statistics Subsystem
The data analysis and statistics subsystem is the core part of the monitoring system. It is the part that the user directly operates and feels. It uses the C/S model for the direct operation and use of the staff within the monitoring department. With the features of safety, convenience and convenience, the system has the characteristics of comprehensiveness and integration, and there is a point of independent operation of each module.
Its features include the following:
1. Real-time monitoring of raw data query, deviation correction, validation of monitoring data validation, and input of forecast data 2. Maintenance of historical data of monitoring data.
3. GIS electronic maps show real-time changes in the status of water pollution 4. Generate water pollution index curves in combination with historical data. Figure 5. Monitoring data anomaly analysis, software alarms, and real-time notification of alarm messages via SMS 6. Various data summary reports, statistical reports, reports Tables, including special format reports 7. Default, custom monitoring acquisition plan maintenance 8. On-site automatic sampler operation 9. Field sample test data entry, comparison with automatic monitoring data, deviation report 10. On-site maintenance record 11. Monitoring site, monitoring Basic information, such as projects, is freely configurable and compatible 12. Personnel rights assignment 13. Data backup 14. WEB user authentication, permission assignment, and web access statistics, etc.
2.3.3 Alarm Message Subsystem 1. The alarm message system is a useful function system that is developed using the currently widely used mobile communication technology. The terminal instrument sets the alarm value and combines with the SMS MODEM to quickly alarm. Information is sent to the designated management.
2. Shenzhen Yunlian Wulian Technology Co., Ltd., pollution monitoring equipment can be configured through the configuration software for flexible configuration of multiple mobile phone numbers received by the peer end, the device is always online, automatic detection of serial data, automatic SMS sending and receiving functions. Serial interface with alarm device, real-time monitoring alarm device serial alarm data, it can be the first time the abnormal alarm information of a monitoring project is sent to the relevant project leader, the supervisor's mobile phone, the alarm system can be a regular statistics summary The data and analysis results are sent to the relevant person in charge through the GSM MODEM, so that the responsible person and supervisor of the relevant project can understand the monitoring situation of the responsible person at the first time when they are on a business trip or go out.
2.3.4 WEB Publication Subsystem 1. Historical Current Water Pollution Reports, Notices 2. Water Body Test Data Query, Graphs 3. Monitoring Site Details, Monitoring Analysis Reports, etc.
Third, project architecture implementation
3.1 Transmission Module and Sewage Treatment Collection Terminals In the industrial field, equipment is generally used to transmit data through the Ethernet port or serial port. The wireless communication module CM550-5XX supports 232/485 communication at the same time, so it can directly communicate with the sewage treatment data collection terminal. As shown below:
3.2 Data Center Network Access Analysis
3.2.1 The dedicated line access center adopts the APN dedicated line. All points use the fixed IP network center of the intranet to access the mobile company's GPRS network through a 2M APN leased line. The interconnected routers use the private fixed IP address for wide-area connection, at the GGSN. GRE tunnels are used between the interconnect routers of mobile companies. Dedicated APNs are allocated to customers and ordinary users are not allowed to apply for the APNs. The SIM card used for the GPRS private network can access the private network APN to prevent the entry of other illegal users.
A user establishes a RADIUS server internally as a remote authentication server for internal user access (or in the APN router, the router's local authentication function is enabled). Only authenticated users are allowed access to ensure internal security.
The user establishes a DHCP server internally (or in the APN router, enabling the DHCP function) and assigns the user's internal address to the authenticated user. End-to-end encryption is used between the mobile terminal and the server platform to avoid possible leakage of information during the entire transmission process. Both parties use a firewall to isolate and perform IP address and port filtering on the firewall. This kind of scheme has greatly improved safety and stability compared with the former scheme in terms of real-time performance, and is suitable for application environments with high security requirements, relatively large number of data points, and high real-time requirements. The best networking method under the condition of funds allowed.
3.2.2 ADSL Dialup Connections (Dynamic Public IP Addresses)
The center uses INTELNET public network such as ADSL to connect, using public network dynamic IP+DNS resolution service. The client first contacts the DNS service provider to open a dynamic domain name. IP MODEM uses the domain name addressing mode to connect to the DNS server. The DNS server then finds the dynamic IP of the public network of the center and establishes a connection. This method can greatly save the cost of the public network fixed IP, but the stability is subject to the stability of the DNS server, so look for a reliable DNS service provider. This type of program is suitable for small-scale applications.
3.2.3 IP connection via fixed public network The center adopts the INTELNET public network such as ADSL, and uses the public IP fixed service. This kind of scheme first applies for broadband business such as ADSL to INTERNET operator, the center has public network fixed IP. IP MODEM initiates a connection directly to the center. The operation is reliable and stable, and such a scheme is recommended.
3.3 Data Center Software Platform Construction There are many ways to construct the central software. For the different methods of incoming data, we provide different software to help customers quickly achieve central data reception and field device management.
Currently provides three ways of the center interface:
1. First of all, for configuration software, many configuration software manufacturers have integrated our drivers and can be configured and used directly.
2. For the case of back-end center software read-only serial port data, provide a virtual serial port software (TCP2COM), using virtual serial port software to convert Ethernet data into serial port data, so that the use of wireless public network transmission data and the existing system No perfect combination of changes.
3. When the customer wants to develop their own data center, at this time our company will provide a dynamic link library, using the dynamic link library customers can easily dock with the transmission channel, while providing a data center DEMO software, not only Open source also assists customers in the development of their own data center software and functions. Customers may quickly develop a flexible, stable, full-featured central management software for terminal management and data interaction through a dynamic link library.
Fourth, the program features 1. The use of wireless IP MODEM basically no cabling, and the use of multi-point to a center of networking, to achieve a centralized management of data.
2. IP MODEM uses high-performance industrial-grade processors and watchdogs and other security mechanisms designed to ensure that the IP MODEM will automatically detect and then automatically power off and restart in the event of a communication interruption. This ensures that the IP MODEM is always online and the communication link is always normal.
3. At present, the number and scale of wastewater treatment monitoring projects are continuously expanding. Therefore, the system adopts a multi-site networking scheme. No matter whether ordinary wireless GPRS or APN private network is adopted, new acquisition control points can be added at any time. Some networks will not cause any disruption and impact.
4. IP MODEM uses standard industrial serial communication, plug and play, and high specification mold design, compact and convenient maintenance.
5. IP MODEM fully adopts the international standard TCP/IP security transmission protocol mechanism to ensure data security and timely, and adopts a completely transparent transmission mechanism to ensure the accuracy of the data.
6. With multi-center design, 5 central monitoring and collection sites can be set at the same time to avoid potential safety hazards due to the inability to monitor the site due to instability or shutdown of a central network.
7. Sewage treatment is generally in remote areas. In this CM550-5XX user-friendly engineering design, but the engineering staff do not need to go to the site can be directly remotely directly configure the network parameters to achieve reasonable use of time and manpower.
8. Optional high-grade materials can work normally at -25~+65oC and 95% relative humidity (non-condensing).
V. Summary At present, the monitoring of sewage data is widely used and is directly related to the safety of the ecological environment. Under a special background, the national policy is also vigorously promoted. Shenzhen Cloud Transport has been applied nationwide in the field of sewage treatment monitoring. In the environment of the Internet of Things, cloud-connected solutions and products have been widely used in mobile POS terminals, finance, supply chain automation, intelligent transportation, industrial automation, intelligent buildings, smart homes, fire protection, public safety, and environmental protection. Meteorology, digital medicine, remote sensing, military, space exploration, agriculture, forestry, water, electricity, coal, petrochemical and other industries.
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