WRITING TASK 1
You should spend about 20 minutes on this task.
The diagram below shows how biogas is produced from farm waste.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
Write at least 150 words.
- 1Collecting wasteManure and crop waste are gathered
- 2Mixing tankWaste is mixed with water
- 3DigesterBacteria break down waste without oxygen
- 4Gas collectedMethane rises and is stored in a dome
- 5Gas cleanedImpurities are removed
- 6GeneratorBiogas fuels an engine
- 7Electricity and heatPower is supplied to the farm
- 8DigestateLeftover slurry is spread as fertiliser