Question

what is the primary purpose of sewage treatment plants? to generate electricity from sewage to collect and transport sewage directly to residential areas to remove contaminates from sewage before release into the environment

Explanation:

• The option "to generate electricity from sewage" is incorrect because sewage treatment plants are not primarily for electricity generation (though some may produce energy as a by - product, it's not the main purpose).
• The option "to collect and transport sewage directly to residential areas" is incorrect as sewage is not transported to residential areas from treatment plants; in fact, it's treated to be safe.
• The correct purpose of sewage treatment plants is to remove contaminants from sewage so that it can be safely released into the environment without causing pollution.

Answer:

to remove contaminates from sewage before release into the environment