Table 1 shows information about the disposal of processed solid sewage sludge at the Aqualink Regional Treatment Facility in 2012 and 2024.
Table 1
| Year | Used as fertiliser (thousands of tonnes) | Sent to landfill (thousands of tonnes) | Incinerated (thousands of tonnes) | Other methods (thousands of tonnes) | Total (thousands of tonnes) |
|---|---|---|---|---|---|
| 2012 | 185 | 142 | 65 | 28 | 420 |
| 2024 | 412 | 12 | 186 | 30 | 640 |
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.