Bio Gas Holder is a storage tank used to store biogas produced from the anaerobic digestion of organic materials. It is an essential component of a bio-methanation plant that is used to generate biogas from organic waste. The biogas produced from the anaerobic digestion process is stored in the biogas holder, which can then be used to generate electricity or heat, or can be compressed for use as a transport fuel.
The biogas holder is designed to withstand the pressure of the biogas and prevent any leakage. It is made of high-strength materials such as reinforced concrete, steel, or flexible membranes, depending on the size of the plant and the specific requirements of the application.
The biogas holder can be of various types depending on the design, including a floating drum, fixed dome, and flexible membrane types. The floating drum type is a simple and cost-effective design, where a gas-tight, floating drum is placed inside a water tank. As the biogas is generated, the drum rises and falls, thereby allowing the gas to be collected.
The fixed dome type is a more advanced design, where a dome-shaped structure is built over the digester tank. The biogas produced is collected in the dome and stored until required.
The flexible membrane type is the most commonly used type in small and medium-scale bio-methanation plants. It consists of a gas-tight membrane that is suspended over the digester tank. As the biogas is produced, it lifts the membrane, and the gas is collected.