Either single or multiple family installations can be built, the choice depending on whether the single family has sufficient manure and other wastes to operate a unit. A minimum single family installation should normally include a digester tank of about 4 to 5 cubic meter capacity and a gasholder of at least 2 cubic meter capacity. Two or more digesters are desirable so that there will not be an interruption of gas production and so that one tank may be loaded while the other is digesting. A single gas-holder can serve more than one digester unit.
If two or more neighboring families have only one farm animal each, it may be advantageous to combine their wastes in one digester installation from which the gas can be distributed to each dwelling. The plant can be located to minimize transportation of wastes and to provide latrine facilities for the cooperating families. This arrangement would permit the use of more than one digestion compartment, resulting in more uniform gas production.
The cost of the mutual installation, per ton of manure decomposed, will be less for multiple family plants than for single plants. However, a multiple family plant serving more than two families may require such excessive piping of gas and transportation of organic matter as to make individual plants generally more economical.
Advance Version Gas Production
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