Everyone is talking about biogas – politicians and ecologists, technicians and economists, laymen
and experts. Biogas has become fashionable.
The energy crisis of the next few years is the shortage of fuel for the daily needs of millions of
people. Simple biogas plants are intended to help solve this problem. It is time to set about this task
in a “professional” manner in the best sense of this word.
Simple biogas plants are complicated enough to require total involvement with their specific
technology. After all, a biogas plant can only help to solve the problems of the future if it works! But
many plants work badly. They are operated wrongly, are deficient in detail and are often incorrectly
Simple biogas plants have been constructed in Third World countries for about thirty years. We
have been able to learn from the biogas pioneers for thirty years. But good and bad solutions are
featured side by side without comment in articles and books. The same mistakes are repeated over
and over again. This need not be the case. The designer of a biogas plant must be able to
distinguish between valid and invalid solutions. This little book is intended to help him in this
The figures and tables reproduced here constitute practical guides. They have been assembled
from external and internal sources and simplified or modified in accordance with the author’s own
experience. They should not be confused with laboratory values.
All power to the elbow of the practical worker, whom I wish every success. I am always grateful for
suggestions and criticism.
In addition to some minor changes, this second, revised edition contains three important
supplementary observations:
– The biogas system must include a tie-in to the animal shelter,
– As a rule, floating-drum plants should be of the water jacket type,


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