Question

treated sewage water is a possible alternative source of drinking water, especially in very dry regions. how can treated sewage water possibly be used as drinking water? the treated sewage water is returned to the drinking water treatment plant and carefully cleaned. the treated sewage is secretly mixed nightly with a city’s drinking water and no one knows about it. the treated sewage is pumped directly back into the drinking water pipes for homes and businesses.

Explanation:

To determine how treated sewage water can be used as drinking water, we analyze each option:

• The first option states that the treated sewage water is returned to the drinking water treatment plant and carefully cleaned. This is a valid and safe process as it undergoes proper treatment to meet drinking water standards.
• The second option about secretly mixing it is unethical and not a proper method, and also violates regulations and public trust.
• The third option of pumping it directly into drinking water pipes is unsafe as it hasn't undergone the full drinking water treatment process at the plant to ensure it's free from contaminants to the required level.

Answer:

A. The treated sewage water is returned to the drinking water treatment plant and carefully cleaned.