Final answer:
Drinking water, environmental restoration, and industry are the three uses of recycled water that require the most treatment.
Step-by-step explanation:
Recycled water needs to be treated differently depending on its use. The three uses that would require the most treatment are:
- Drinking water: When recycled water is treated to reach drinking water standards, it requires the most extensive treatment due to the high level of purification required to ensure it is safe for consumption.
- Environmental restoration: If recycled water is used for environmental restoration, it may require significant treatment to ensure the water is free from pollutants and contaminants that could harm the ecosystem.
- Industry: Industrial uses of recycled water often require specialized treatment processes to remove impurities and chemicals, depending on the specific requirements of the industry.