The gas holder is used to collect biogas, equalize pressure and composition. A gas holder has two layers: an external all-weather polystyrene film coated with PVC and protected from ultraviolet and frost; PELD inner membrane is methane impervious and biogas resistant. To prevent damage to the gas holder caused by overpressure, a safety valve is installed. To inspect the inner membrane, the outer dome is equipped with acrylic viewing windows.

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