Double Membrane Biogas Holder for Biogas Digester Tanks: Often Used as the Flexible Dome to Capture and Store the Gas Directly Above the Digester

Double Membrane Biogas Holder for Biogas Digester Tanks: Often Used as the Flexible Dome to Capture and Store the Gas Directly Above the Digester

The Biogas Digester Tank is the central component of any anaerobic digestion (AD) facility, converting organic waste into stabilized digestate and valuable biogas.1 For the plant to maximize its efficiency and profitability, the gas co-product must be captured instantly and stored securely. Since the biogas is generated at a low, variable pressure, the storage solution must be highly flexible and integrated directly at the point of production. This seamless integration stabilizes the entire gas utilization system.

The Double Membrane Biogas Holder is the industry-standard technology that achieves this. It is often used as the flexible dome to capture and store the gas directly above the digester. This ingenious design replaces a rigid roof, offering a dual function: it provides a hermetic seal for the digester contents and simultaneously acts as a large, flexible reservoir. This integrated approach ensures every cubic meter of gas is captured, while the flexibility manages the pressure fluctuations critical for safe and efficient operation.

Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), a global leader in advanced containment solutions, specializes in engineering high-performance storage systems. Our Double Membrane Biogas Holders are state-of-the-art gas holders designed to integrate perfectly with various digester tanks, offering superior gas containment, pressure regulation, and long-term durability.2

Product Advantages of the Flexible Dome

Center Enamel’s Double Membrane Biogas Holders are meticulously engineered for the demanding environment of low-pressure gas storage.3 The flexible dome design provides distinct advantages over traditional rigid caps or separate external storage systems.

Integrated Capture and Storage

The most significant benefit is the system's ability to act as the integrated flexible roof of the digester tank. This placement ensures maximum gas capture efficiency by collecting the gas immediately as it rises from the fermentation slurry. The volume of the inner membrane dynamically expands and contracts to accommodate the natural fluctuations in biogas production.4 This acts as a perfect buffer, ensuring a smooth, stable supply of gas to downstream equipment like generators or upgrading units.

Superior Structural Integrity and Durability

The double-membrane architecture provides exceptional resilience. The inner membrane securely contains the biogas, while the outer membrane is inflated with air to form a structurally rigid, protective dome.5 This outer shell shields the inner membrane and the gas beneath from external environmental stresses, including high winds, heavy snow loads, and ultraviolet (UV) radiation.6 This robust, durable design minimizes wear and tear, leading to low maintenance requirements and a long operational lifespan, which is critical for continuous AD processes.7

Enhanced Safety and Operational Visibility

Operating at a naturally low pressure, the system is inherently safe, minimizing the risks associated with storing flammable gas. Furthermore, the external, inflated dome provides a visible indicator of the stored gas volume.8 Operators can instantly assess the current gas reserve by observing the height of the dome, allowing for proactive energy management and adjustments to utilization equipment. The modular, lightweight nature of the system also ensures simplified, rapid installation directly onto various types of digester tanks.

Company Advantages

Center Enamel’s standing as a premier global supplier is built on our deep technical expertise and commitment to quality. As a pioneering manufacturer of Glass-Fused-to-Steel (GFS) tanks in China, our company possesses decades of proven history in high-performance containment solutions. Our advanced production capabilities are backed by more than 20 patents in enameling technology and a dedicated research and development team focused on innovation.

Our dedication to quality is demonstrated through our strict adherence to international standards. Our products and processes conform to the most demanding international benchmarks, including standards for quality management, drinking water safety, and occupational health. These certifications provide an independent and verifiable guarantee of quality, safety, and compliance with the most stringent regulations, which is critical for successful operation in international markets. This commitment, combined with our proven global track record of successful projects in over 100 countries, makes us a reliable and expert partner for any biogas project.

Product Application Areas

Center Enamel's Double Membrane Biogas Holders are essential components across all sectors utilizing anaerobic digestion technology:9

Biogas Digester Tanks (Integrated Domes): Used for instantaneous capture and buffering of biogas generated from manure, slurry, or organic waste.

Agricultural and Livestock Wastewater Treatment: Essential for farms processing manure and agricultural residues, enabling on-site energy generation.10

Industrial Wastewater and Food Waste Treatment: Capturing and storing biogas generated from high-strength organic effluent to offset high energy consumption.11

Biomethane and Compressed Biogas (CBG) Plants: Providing the essential intermediary buffer storage before high-pressure purification and compression.

Global Reach and Proven Excellence: Project Cases

Our extensive portfolio of successful containment projects showcases our capability to engineer robust, sealed, and durable solutions—expertise directly applied to our high-performance biogas holders.12 The following non-fictitious cases demonstrate our global reach and technical excellence:

Jiangsu Xuzhou Biogas Project: We supplied 4 tanks with a total capacity of 30,532 cubic meters for a large-scale biogas project in Jiangsu, China, showcasing our capability in major energy recovery infrastructure.13

Guizhou Tongren Food Waste Treatment Project: We provided 2 tanks with a total capacity of 2,934 cubic meters for a food waste treatment facility in Guizhou, China, highlighting our role in high-volume waste-to-energy solutions.14

Muyuan Group Suining 4th Farm Livestock Wastewater Project: For a major agricultural client, we supplied 2 tanks with a total capacity of 17,962 cubic meters for a livestock wastewater project, demonstrating our expertise in large-volume, sealed agricultural containment critical for biogas management.15

Conclusion

For Biogas Digester Tanks, the Double Membrane Biogas Holder is the optimal, most functional solution. By providing a flexible, durable, and integrated dome, it ensures the complete capture and effective pressure regulation of the methane-rich fuel. Our systems empower AD operators to maximize gas output, ensure stable energy utilization, and drive their facilities toward greater sustainability and profitability.