Beijing's first landfill gas liquefied natural gas

With the rapid growth of Beijing's population, the city is facing significant challenges in managing the large volume of domestic waste. The gaps in waste disposal, reduction, harmlessness, and resource recovery have become increasingly evident. In recent years, Beijing has focused on improving the efficiency of waste recycling and investing in advanced technologies to address these issues. A key player in this effort is the Beijing Environmental Sanitation Group, which has pioneered the development of landfill gas liquefied natural gas (LNG) in China, offering both environmental benefits and energy savings. Landfill gas, a common byproduct of waste disposal in urban areas, contains methane, carbon dioxide, nitrogen, and other gases that are flammable, toxic, and odorous. If not properly managed, direct emissions can lead to air pollution and wasted energy. Traditionally, landfill gas has been burned or used for power generation, but these methods often fail to fully utilize the energy potential. To solve this problem, Beijing Environmental Sanitation Group launched a major science and technology project aimed at developing clean fuel from landfill gas, focusing on high-efficiency collection and purification processes. The project led to the creation of five patents and enabled the production of 2.394 million standard cubic meters of LNG annually from 5.6 million standard cubic meters of landfill gas. This process not only reduces carbon dioxide emissions by 52,100 tons per year but also helps convert waste into valuable resources. At the Daxing Anding Waste Sanitary Landfill, vehicles powered by this recovered gas operate efficiently with minimal pollution, demonstrating the practical application of this innovative technology. He Liang, deputy general manager of the group, highlighted the importance of improving gas collection systems, using vertical pipes and negative pressure devices to enhance efficiency. The purification process involves desulfurization, deoxidation, and deep dehydration, ensuring that the final product meets national standards. This system effectively reduces the odor of landfills and minimizes greenhouse gas emissions, turning waste into a sustainable energy source. Looking ahead, Beijing plans to expand the use of LNG-powered sanitation vehicles, aiming to replace 2,500 vehicles by 2015. The city also intends to extend this technology to taxis and buses, working closely with automobile manufacturers to lower costs and technical barriers. Industry experts emphasize the need for continued investment in research and development, as well as improved policies and public engagement to support waste management initiatives. Beijing’s long-term goal is to increase the proportion of waste incineration and biochemical treatment to over 70%, while reducing landfill usage to less than 30%. To achieve this, the city is accelerating the construction of new facilities and improving operational standards. However, challenges remain, including the need for better leachate treatment, odor control, and public acceptance of waste management projects. In conclusion, transforming waste into resources requires a combination of advanced technology, government support, and public cooperation. By promoting cleaner energy solutions and investing in sustainable infrastructure, Beijing is setting an example for other cities facing similar environmental challenges.

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