Grid monitoring into development trends

The increasingly complex treatment of air pollution is challenging the traditional monitoring of pollution sources. Today, the grid monitoring system has become a development trend. Due to its precision and science, it effectively improves the efficiency and ability to manage haze. Some local governments are piloting the purchase of grid monitoring services provided by environmental protection companies to provide data and technical support for their environmental supervision.

Recently, the media in Shijiazhuang City, Hebei Province visited the grid monitoring and early warning and decision support system (hereinafter referred to as “grid monitoring system”) monitoring platform for atmospheric pollution prevention. With the click of a mouse by the operator, the assessment data of various pollutants in the national air quality monitoring sites in Shijiazhuang City and the monitoring data of the surrounding mini-monitoring stations as well as the evaluation of historical data trends are displayed on the big screen.

Sun Ruibin, secretary of the Shijiazhuang Municipal Party Committee, pointed out that the construction and operation of the grid monitoring system provided strong technical support for the prevention and control of atmospheric pollution in Shijiazhuang City. The promotion of air pollution control was based on experience, sense, and extensiveness to the grid and real-time. Accurate changes can reduce the blindness of work and effectively improve the efficiency and ability to manage haze.

At the same time, he emphasized that the monitoring companies must research and establish a set of operational mechanisms that can fully play their role as they complete the system hardware development, so as to ensure excellence, ensure accurate, reliable and scientific monitoring data collection, transmission and analysis.

Traditional monitoring encounters awkward challenges?

There is no online monitoring for fugitive emissions, and it is difficult to obtain accurate total city pollutant discharge data; the number of monitoring points in the national control point monitoring system is limited; experts on limited manpower and material resources for manual gridization pointed out that domestic pollution sources are currently monitored online. Only limited to some industrial pollution sources organized emissions. For on-site monitoring such as dust from construction sites, exhaust from motor vehicles, and some industrial production and catering, there is no on-line monitoring, and coupled with the lack of a complete list of dynamic emission sources, it is difficult to obtain accurate total city pollutant discharge data.

Industry insiders also pointed out that the current implementation of the air quality national control point monitoring system has limited monitoring and positioning, and it is difficult to provide sufficient data support and governance basis for improving regional air quality.

The General Office of the State Council has issued the “Circular on Strengthening the Enforcement of Environmental Supervision and Administration”, which requires municipalities and county governments to divide the administrative region into a number of environmental regulatory grids, clearly regulate the responsible persons, and implement supervision plans. At present, the use of an artificial supervision approach to the grid management of the urban environment has achieved remarkable results in the prevention and control of atmospheric pollution, but its manpower and material resources are limited, and its timeliness and response to sudden pollution incidents and judgments are insufficient.

Experts suggest that real-time monitoring of the urban air environment quality and its sources of pollutants should be conducted in real time to compensate for the lack of manual supervision and to strengthen supervision of environmental grids. According to relevant technical personnel, the grid monitoring system is more targeted and systematic. The entire system consists of three parts: the perception layer, the platform layer, and the application layer. Among them, the sensory layer is composed of a micro-monitoring station with large density. The data monitored by the monitoring station is transmitted to the platform layer through the wireless network for data processing and automatic correction.

At the application layer, real-time display of the air quality status of each monitoring point and the entire area, as well as the concentration level of pollutants, and provision of various service services such as abnormal alarms, regional air quality trends, and so on.

Why are the monitoring sites so dense?

Eight mini-monitoring stations were set up around the national control points; monitoring stations for major pollution source enterprises, industrial agglomeration areas, construction sites, urban loops, and other areas were set up. According to the introduction, Shijiazhuang City Grid Monitoring System Construction Points In two phases, it was contracted by Hebei Xianhe Environmental Protection (300137, Share Bar) Technology Co., Ltd. (hereinafter referred to as “Xianhe Environmental Protection Company”). At present, the first phase has been completed and more than 200 monitoring stations have been constructed.

Wang Chunying, Vice Minister of Marketing of Xianhe Environmental Protection Company, said that there are probably two ways of cooperation with the government. One is that the government is responsible for system equipment investment, and the company is responsible for installation and operation. Another way is that enterprises are responsible for the investment and operation of system equipment, ownership of equipment for environmental protection companies, and government procurement monitoring services. The cost of services depends on the number of monitoring stations, service scope, and follow-up consultation services.

"In order to accurately locate pollution sources and real-timely monitor changes in the atmospheric quality of the entire region, the grid monitoring system conducts large-density networks around the city's air quality control points, key regions, key industrial enterprises, road traffic, and construction sites. A micro-monitoring station was deployed to extend the monitoring antennae to each pollution source.” Wang Chunying told reporters.

In the field recently, we examined the construction sites of the No. 1 tender section of Yinhu City, Shijiazhuang City, the construction site of the Great Wall Bridge Station of Subway Line 1, the snack street of the shooting range, and the mini-monitoring site around the national air quality control point of Century Park. Among them, the Yinhu City 1 tender construction site and the Metro Line 1 Great Wall Bridge Station construction site are located in the east, west, north, south, and north, respectively, with a miniature monitor installed.

Eight mini-monitoring stations were installed around the National Air Quality Control Point in Century Park to monitor the main sources of pollution affecting urban air quality. Wang Chunying said that the real-time monitoring of the sources of pollutants around the national control point, combined with meteorological data, discriminates the reasons that affect the environmental quality of the national control points. Because the formation mechanism of PM2.5 and O3 is complex and varied, it is necessary to combine various parameters to determine the source direction and the type of pollutants. Therefore, a monitoring station is deployed at a large density around the national control points in order to obtain more monitoring data.

Wang Chunying said that since large emission sources around urban areas also have an impact on air quality, large-density distribution of key pollution source enterprises, industrial agglomeration areas, construction sites, urban ring roads, trunk roads, and traffic intersections must be carried out throughout the city. Monitoring stations, real-time control of pollutant discharge levels and effective control.

At the same time, taking into account the transmission of atmospheric pollution, a boundary station was established on the input and output channels of air pollution between various districts and counties for the study of transmission and diffusion of atmospheric pollution and to determine the sources of air pollution transport; and according to “1 km of cities, 2 townships The "kilometer" method was used to supplement the layout and realize the monitoring of the grid distribution in the entire region.

According to Chai Fahe, deputy dean of the Chinese Research Academy of Environmental Sciences, a grid monitoring system can help realize real-time monitoring of the entire network, which will help form a new environmental regulatory landscape.

Big data support risk prediction reflects the dynamic changes of air quality in the entire region; discovery of abnormal emission behaviors of pollution sources and alarms; realizing more accurate environmental forecasts; providing basis for the government to formulate long-term emission reduction policies and measures. “The grid monitoring system can display monitoring in real time. In addition to data, the use of big data technology to mine the relationship between various types of environmental data, combined with meteorological data, geographic information and data, can also provide a number of services such as air environmental quality supervision, risk prediction, pollution control, and environmental governance assessment." Shang Yongchang, deputy director of the research center of Xianhe Environmental Protection Company, said.

Shang Yongchang stated that the grid monitoring system can, on a microscopic level, monitor the emission of pollution sources (such as construction sites, factories, etc.) in real time and its effect on the diffusion of surrounding areas; on the macro level, it can reflect the air of the entire region. Dynamic changes in quality. "According to the dynamic changes, we can quickly find the punctuation point at a certain time in the area, and discover the abnormal events such as stealing and stealing in time," he said.

Wang Chunying said that once the system showed that the PM10 data of a construction site monitoring station in Shijiazhuang was abnormally high. According to the investigation by the environmental protection department, the site was undergoing partial demolition and no protective measures were taken, resulting in abnormally high data. .

Wang Chunying said that the grid monitoring system can also analyze and identify major factors affecting the air quality in the region, and conduct targeted treatment of major air pollution sources (such as construction sites, factories, boilers, etc.) that affect air quality, and improve environmental supervision and governance. Effectiveness.

"If the system finds an abnormal emission behavior of the pollution source, the abnormal alarm information will be automatically transmitted to the relevant responsible units through the computer web terminal, mobile APP terminal or the WeChat platform. The regulatory authority can quickly lock the pollution source and take measures to deal with the effects in real time. Monitoring," she said.

It is understood that this set of monitoring systems can also comprehensively reflect the impact of corporate production on the environment. The government can thus comprehensively regulate and control the production of enterprises and shift peak production to reduce the impact and impact of concentrated discharge of pollutants on environmental capacity.

Shang Yongchang emphasized that since the small particulate matter monitor and the small five-parameter air quality monitor are monitored using the national standard method, their monitoring data can be used as a basis for law enforcement by relevant government departments.

Wang Chunying said that with the gradual accumulation of monitoring data, professional and technical personnel can use professional big data analysis tools to achieve more accurate environmental warning and forecasting, and provide decision support for the government to respond to heavy pollution weather. It can evaluate the air pollution emissions and treatment effects, assess the contribution rate of each pollution source to air pollution, and provide scientific basis for the government to formulate long-term emission reduction policies and measures such as adjusting industrial structure and optimizing energy structure.