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close this bookBetter Farming Series 32 - Biogas 2: Building a Better Biogas Unit (FAO, 1986, 47 p.)
View the document(introduction...)
View the documentPreface
View the documentIntroduction
Open this folder and view contentsHow to build a better small biogas unit
Open this folder and view contentsPutting in the waste
View the documentTime
Open this folder and view contentsTemperature
View the documentScum
View the documentWhen the gas is made
View the documentTaking care of your biogas unit
View the documentMaking more biogas
Open this folder and view contentsWhat more can you do?


104. It may take up to three weeks or even a month for the waste in your new biogas unit to begin making gas. After that, the unit will continue to make gas for about eight weeks.

105. During these eight weeks half of the gas will be made in the first two or three weeks and the rest in the last five or six weeks.

106. If you find that too little gas is being made in the last weeks empty the unit and start again.