Question

question 20 of 25
in many cities, wastewater travels through sewer lines to be processed at a wastewater - treatment plant. the treatment plant uses many methods to break down materials in wastewater and make sure materials are safe before release. which of the methods used during treatment is meant to prevent pollution that cannot be broken down by treatment from re - entering the environment?
a. aeration of liquid waste
b. settling out of solid waste
c. heating of liquid waste
d. burying of solid waste

Explanation:

Aeration breaks down organic matter, settling removes solids from liquid but doesn't prevent non - treatable pollutants from re - entering. Heating is not a common method for preventing non - treatable pollution re - entry. Burying solid waste keeps non - treatable pollutants from re - entering the environment.

Answer:

D. Burying of solid waste