Ferrocement plants
The ferro-cement type of construction can be applied either as a self-supporting shell or an
earth-pit lining. The vessel is usually cylindrical. Very small plants (Volume under 6 m3) can
be prefabricated. As in the case of a fixed-dome plant, the ferrocement gasholder requires
special sealing measures (proven reliability with cemented-on aluminium foil).
Advantages: Low cost of construction, especially in comparison with potentially high
cost of masonry for alternative plants; mass production possible; low material input.
Disadvantages: Substantial consumption of essentially good-quality cement;
workmanship must meet high quality standards; uses substantial amounts of expensive
wire mesh; construction technique not yet adequately time-tested; special sealing
measures for the gas-holder are necessary.
Ferro-cement biogas plants are only recommended in cases where special ferro-cement
know-how is available.
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