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close this bookBiogas Plants (GTZ, 1988)
View the document(introduction...)
View the documentAcknowledgements
View the documentPreface
View the document0. Biogas as appropriate technology
View the document1. Benefits and costs of a biogas plant
Open this folder and view contents2. The dgestion process
Open this folder and view contents3. Biogas plants
Open this folder and view contents4. Scaling of biogas plants
Open this folder and view contents5. Design of biogas plants
Open this folder and view contents6. Biogas utilization
View the document7. Planning, design and construction
View the document8. Appendix
View the documentBibliography
View the documentList of figures

Preface

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 scaled.

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 respect.

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 waterjacket type,

— The covers of fixed-dome plants must have a conical fit.

I would like to express my appreciation to all those who have provided impulses and constructive criticism, in particular the members of the GATE Biogas Extension Program, whose ideas concerning "userfriendly" biogas plants have yielded valuable impetus.

Ludwig Sasse

Hoffnungstr. 30
D-2800 Bremen 1
Federal Republic of Germany