CBSE Class 7 Answered
How can contamination of drinking water occur from sewage even in a covered drainage system?
Asked by gspublicschool | 06 Mar, 2019, 10:10: AM
Expert Answer
Contamination of drinking water sources by sewage can occur from raw sewage overflow, septic tanks, leaking sewer lines, and partially treated wastewater. Sewage itself is a complex mixture and can contain many types of contaminants. Major contamination of water resources arises from the contamination by bacteria, nitrates, metals, trace quantities of toxic materials, and salts.
Answered by Sheetal Kolte | 06 Mar, 2019, 12:25: PM
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