Page 14 - Biogas Plant Construction

356 Biogas

Fig. 13. Integrating the heating tubes (BIOGAS NORD GmbH)

5.7 Building the gas holder
A wood or steel structure in form of umbrella is built, and then a mesh network is relayed
on the umbrella structure (Figs. 14 and 15). The air supported double membrane cover,
which includes the gas holder, is mounted over the structure. The flexible membrane of the
gas collector, i.e. holder, moves up and down as a function of the gas pressure. On the other
hand, the storage tank covers are numerous: (1) closed cover (concrete, plastic, and tent), (2)
straw cover, (3) granulate (perlite), (4) swimming vinyl covering, and (5) open as open
lagoons and open storage tanks.

Fig. 14. Wood structure and mesh network that supports the gas holder of digester in a
commercial biogas plant (MT-ENERGIE GmbH & Co. KG)

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