Table 1 shows information about the disposal of processed solid sewage sludge in a European region in 2012 and 2024.
Table 1
| Year | Used as fertiliser (millions of kg) | Sent to landfill (millions of kg) | Incinerated (millions of kg) | Other methods (millions of kg) | Total (millions of kg) |
|---|---|---|---|---|---|
| 2012 | 580 | 240 | 160 | 120 | 1100 |
| 2024 | 1220 | 25 | 380 | 75 | 1700 |
Calculate the percentage of processed solid sewage sludge that was incinerated in 2024. Give your answer to 3 significant figures.
State the biological treatment process used respectively for:
11 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals (HT only). Each one has a worked solution and a mark scheme showing where the marks go.