Solidified structure biogas digester and construction method
August 10 21:00:45, 2025
The integration of new materials and advanced technologies has become a critical focus in the rural energy sector, particularly in reducing the cost of biogas tanks and accelerating the development of energy infrastructure in rural areas. The Sichuan Biogas Association introduced an innovative approach by combining soil solidification technology with traditional biogas tank construction methods. By adding curing agents to the soil, they created a dense, uniform, waterproof, and durable material suitable for constructing biogas pools. This method allows more than 50% of the materials to be sourced locally, significantly reducing the need for cement, sand, bricks, and other imported building materials, thereby lowering costs and offering substantial economic benefits.
This technique represents a major innovation in the construction of household biogas tanks, enhancing both efficiency and sustainability. The concept, known as "Solidified Soil Structure Digesters," was developed by integrating existing construction techniques with the US Lubang EN-1 soil strengthening agent technology. This new method not only improves structural integrity but also simplifies the construction process, reduces concrete usage, and lowers overall material consumption.
The structural design of the solidified soil biogas digester is based on the principle of thin-shell structures. The bottom consists of a solidified soil layer and a cement mortar sealing layer, while the walls are composed of a solidified soil layer, prefabricated thin-shell concrete plates, and an inner cement mortar layer. These components work together to provide strong structural support and effective water resistance. The pool cover typically uses traditional floating brick arches or glass fiber reinforced plastic (FRP) arch covers.
Construction procedures involve careful preparation, including site selection, material sourcing, and excavation. The soil is dried, crushed, and mixed with cement and the Lubang agent to create a solidified mixture. This mixture is then compacted in layers to ensure durability and stability. Special attention is given to compaction techniques, ensuring that each layer is evenly distributed and properly tamped to meet structural requirements.
Plastering is performed in multiple layers using a cement mortar mix, ensuring a smooth and sealed surface. Additional steps include installing steel molds, FRP arch covers, and prefabricated panels, all of which contribute to a more efficient and cost-effective construction process.
The advantages of this method include reduced construction costs, lower labor intensity due to local material sourcing, and a higher degree of industrialization when using prefabricated components. These features make it a promising solution for promoting sustainable energy development in rural areas.
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