en.Wedoany.com Reported - Located in Hulunbuir, Inner Mongolia, the microalgae biological carbon sequestration ecological restoration demonstration project at the Baorixile Open-pit Mine of CHN Energy's Yanbao Energy has recently exceeded 50 tons in large-scale microalgae cultivation. This project is China's first high-cold mine microalgae biological carbon sequestration ecological restoration demonstration project, filling a technological gap in the country. It is providing a replicable and scalable new solution for green mine construction in China's arid and cold northern regions.
Microalgae are known as nature's "super carbon fixers," with a carbon sequestration efficiency 10 to 50 times that of ordinary forests. Every ton of microalgae biomass produced can fix approximately 1.8 tons of carbon dioxide. The Baorixile mining area is located in a high-latitude, high-cold region, with winter temperatures dropping as low as minus 40 degrees Celsius, strong winds, thin soil layers, and severe soil desertification. The project team, in collaboration with the New Energy Technology Research Institute of CHN Energy, formed a joint research team. They conducted hundreds of low-temperature and high-light stress acclimation experiments, repeatedly adjusted the ratio of mine water, and continuously optimized the formula for biological soil remediation agents. The project uses locally sourced materials, utilizing mine water and industrial carbon dioxide emissions as dual raw materials for microalgae cultivation, establishing a closed-loop circular industrial chain: microalgae efficiently capture carbon sources through photosynthesis, simultaneously degrade nitrogen and phosphorus in water, immobilize heavy metals, and purify mine wastewater; the treated clean water is returned to the ecological experimental area for vegetation irrigation; and sandy gravel land sprayed with algae liquid remediation agents rapidly forms stable biological algal crusts.
The project has established a core experimental area of 2,100 square meters on a sandy waste dump, treating a total of 3,700 tons of mine water, achieving biological carbon sequestration of 1,000 tons, and securing multiple core invention patents in water retention improvement and microbial fertilizers. Field monitoring shows that soil fertility in the experimental area has increased by 16%, water retention performance by 20%, soil microbial quantity by 35%, and vegetation growth promotion capacity by 30%, while the overall cost of ecological restoration has been reduced by over 30%. Vegetation coverage has increased from bare land levels to 54%, and the maximum increase in total soil organic carbon has reached 613.2%. Due to its outstanding technological innovation, the project has won the second prize for scientific and technological progress at the Third China Green Mine International Annual Conference, becoming a benchmark case for ecological and low-carbon transformation in the coal industry.
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