Some of the alternative sewage disposal systems for human waste are given below : Chemical toilets, Composting toilets, vacuum toilets, Septic tank toilets, Vermi-processing toilets
Which of these toilets are used in aeroplanes?

Answer

To determine which of the listed alternative sewage disposal systems are used in aeroplanes, we will analyze each type of toilet mentioned:

1. **Chemical Toilets**: These toilets contain chemicals that treat human waste and are portable, often used in temporary settings like festivals. However, they are not used in aeroplanes.

2. **Composting Toilets**: These are self-contained units that compost human waste and are typically used in areas without a sewage system or limited water supply. They are not designed for use in aeroplanes.

3. **Vacuum Toilets**: These toilets use suction to remove waste, requiring minimal water. This system is efficient and is specifically designed for use in aeroplanes due to space and water constraints.

4. **Septic Tank Toilets**: These toilets are used in isolated areas where waste is collected in an underground tank. They are not suitable for aeroplanes.

5. **Vermi-Processing Toilets**: These toilets utilize earthworms to convert human waste into manure. They are not used in aeroplanes.

Based on the analysis, the only type of toilet from the list that is used in aeroplanes is **Vacuum Toilets**.

### Final Answer:
**Vacuum Toilets are used in aeroplanes.**

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