 | Better Farming Series 32 - Biogas 2: Building a Better Biogas Unit (FAO, 1986, 47 p.) |
 |  | (introduction...) |
| | Preface |
| | Introduction |
|  | How to build a better small biogas unit |
| | You will need |
| | Cleaning the oil drum |
| | Where to put your biogas unit |
| | Preparing the oil drum |
| | Testing for leaks |
| | Preparing the gas holder |
| | Attaching the gas holder |
| | Putting in the waste |
| | The waste materials |
| | The starter |
| | Putting waste in this biogas unit |
| | After the waste is in |
| | Time |
| | Temperature |
| | (introduction...) |
| | Cold weather protection |
| | Scum |
| | When the gas is made |
| | Taking care of your biogas unit |
| | Making more biogas |
| | What more can you do? |
| | (introduction...) |
| | Another kind of biogas unit |
Cold weather protection
108. If the temperature where you live often falls below 15°C, you can keep the waste mixture warm by covering this biogas unit with plant materials such as leaves, grass, straw or maize stalks.
Protect the drum oil
109. However, as you were told in Item 28 in this booklet, you must not put this unit underground as you could with your old unit or you will not be able to shake it to break up the scum
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