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Membrane storage system is better than the traditional one: Compared with the traditional biogas storage (wet-type, dry-type), membrane storage system get the advantage as follows: 1. Biogas can be 100% used, the inner biogas can be totally squeezed out which is hardly to achieve by the traditional one. 2. In light weight: It weighs only a small percentage than the traditional one. This does great good for make, transportation, installation, etc., and saving a lot of construction time and material cost. 3. No need to maintain for long: For the membrane field is made of the super anti-corrosion material, and can last more than 15 years in the biogas circumstance. Meanwhile, it is well welded by hot-melted materials, so we do not have to do regular maintain when use membrane storage. 4. It saves much time and labor: For it is small and light, also the membrane field has been well-shaped in factory, so the on-site installation will just cost 1-2 days. 5. Saving money: From the mentioned above, we can know that the total cost is lower than that of the traditional one. 6. Anti-freezing: For there is no water in the inner structure, there is no need to worry about the frozen problem in the cold area. 7. Keep warm: As we know, air is the perfect medium to keep warm. So the air between two-layer membranes makes the system warmer than the traditional one. 8. Artistic: The main color of the membrane is grey white, so it can easily be matched. Meanwhile, the whole structure is designed to be spheroidal, and this arise the sense of beauty. 9. Comparatively safe when accident happens: Anyway, biogas is flammable gases, if by any chance explosion happens, it will not produce so much injury pieces as other hard material made storage. 10. Easily repair: If unforeseeable things happened, most of the maintenance can be easily done at present. For example, when gas leaking, it only need a small patch.