Online monitoring of coal mine water pollution sources

Online Monitoring Project for Water Pollution Sources at a Coal Mine

This online monitoring project for water pollution sources at a coal mine is a core environmental engineering initiative aimed at implementing the environmental protection control requirements of the coal industry, preventing the risks of coal mine water pollution, and promoting the construction of green mines. The project focuses on various water pollution sources generated during coal mining and washing processes, including mine water discharge, coal washing wastewater, and coal slime filter press wastewater. It establishes a comprehensive, intelligent, round‑the‑clock online monitoring system, addressing the challenges of monitoring water pollution sources in coal mines and ensuring that wastewater is discharged in compliance with standards and utilized as a resource.

Wastewater generated during coal mine production is characterized by complex composition, large fluctuations in pollutant levels, high suspended solids content, and high salinity. Furthermore, pollution source points are scattered, mostly located at the outlets of underground clean‑dirty water separation devices, surface wastewater treatment stations, and water transmission pipeline networks. Traditional manual sampling monitoring suffers from long cycles, delayed data, high safety risks during underground inspections, and an inability to accurately capture water quality fluctuations. These shortcomings fail to meet the requirements of the Discharge Standard of Pollutants for Coal Industry (GB 20426‑2006) and the routine control requirements of environmental protection regulatory authorities. To strictly fulfill the environmental protection responsibility, prevent water pollution incidents, and improve the intelligent level of coal mine water environment control, this online monitoring project for water pollution sources has been launched. The project centrally deploys professional online water quality analyzers adapted to the special working conditions of coal mines, achieving full‑process, full‑coverage, and precise monitoring of water pollution sources at the mine. This provides solid technical support for coal mine water pollution treatment, compliance discharge, and resource utilization.

Monitoring System and Deployment

This project combines the characteristics of the coal mine production process, the distribution patterns of water pollution sources, and environmental control requirements. Using online water quality analyzers as the core monitoring equipment, monitoring points are scientifically deployed to achieve full‑chain monitoring coverage of water pollution sources at the coal mine. The online water quality analyzers focus on the core characteristics of coal mine water pollution sources, primarily monitoring conventional and coal‑mine‑specific indicators such as pH, COD, ammonia nitrogen, suspended solids (SS), and total salinity. At certain points, depending on the actual pollution situation, the monitoring capability is extended to include characteristic pollutants such as heavy metals (lead, cadmium, etc.) and petroleum compounds. The system strictly adheres to national monitoring standards for the coal industry and relevant technical specifications. A dual‑sensor redundancy design is adopted to improve monitoring accuracy, ensuring that the monitoring data are authentic, reliable, and compliant with regulatory requirements, and that they fully reflect the discharge dynamics and treatment effectiveness of coal mine water pollution sources.

Equipment Features and Capabilities

The online water quality analyzers used in the project offer core advantages of automation, high precision, high stability, strong anti‑interference capability, and a high protection rating. They integrate full‑process functions including automatic sampling, automatic pretreatment, automatic digestion, automatic detection, automatic cleaning, automatic calibration, and intelligent quality control. They can operate continuously 24/7, significantly reducing manual maintenance workload. Furthermore, the equipment supports 4G/NB‑IoT wireless data transmission technology, enabling real‑time upload of monitoring data to environmental protection platforms, safety production monitoring systems, and local environmental supervision authority platforms. This facilitates real‑time data viewing, historical data retrieval, and automatic alerting for abnormal indicators. When monitoring data exceed the standard threshold, the system rapidly triggers multi‑level alert signals, allowing staff to promptly identify pollution sources, adjust wastewater treatment process parameters, and initiate emergency response measures to prevent non‑compliant wastewater discharge and the spread of water pollution. In some projects, the system can also be interfaced with a digital twin centralized control platform to achieve data collection from multiple stations with a single source and coordinated scheduling.

Project Outcomes and Significance

The implementation of this project has comprehensively improved the intelligence and precision of water pollution source control at the coal mine, effectively addressing the shortcomings of traditional monitoring methods and achieving closed‑loop management of "real‑time monitoring, precise early warning, rapid response, and full‑process control" for coal mine water pollution sources. This aligns with the national requirement to "promote source control and centralized treatment of mine water." The continuous and stable operation of the online water quality analyzers not only provides accurate data support for optimizing coal mine wastewater treatment processes, operational adjustments, and energy consumption control – helping to improve treatment efficiency, promote resource utilization of mine water, and reduce water resource consumption costs (in some mining areas, achieving "zero external discharge" of wastewater) – but also ensures that coal mine wastewater discharge strictly complies with national and local environmental protection standards, effectively preventing water pollution incidents and avoiding the risk of environmental penalties.

Moreover, the implementation of this project supports the coal mine in fulfilling the requirements of green mine construction, improves the regional coal mine water environment regulatory system, and promotes the green, low‑carbon, and sustainable development of the coal industry. It achieves the coordinated alignment of environmental compliance with economic, social, and ecological benefits, providing a replicable and scalable monitoring solution for ecological and environmental protection in the coal mining industry.