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 where water supply is limited or not availabe at all?

Explanation

To determine which sewage disposal systems are suitable for areas with limited or no water supply, let's analyze each option provided:

1. **Chemical Toilets**:
- These toilets use chemicals to treat human waste and are often used in temporary settings like music festivals and events. They do not rely on water for flushing, but they are not typically used in permanent installations where water supply is limited.
- **Conclusion**: Not suitable for areas with limited water supply.

2. **Vacuum Toilets**:
- Vacuum toilets use suction to minimize water usage, making them efficient in terms of water consumption. However, they still require some water to function, which makes them unsuitable for areas without any water supply.
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