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Question
What is sewage? In which way can sewage be harmful to us?
Solution
Sewage is a collective word for municipal waste water (both liquid and solid wastes) generated in cities and towns and taken away in sewers. Chemically, sewage is made up of around 99% water and 1% solid waste, which includes both inorganic and organic stuff. Sewage contains bacteria (coliforms, streptococci, clostridia, lactobacilli), microfungi, protozoa, and microalgae. Proper sewage disposal is critical because untreated sewage in rivers and other bodies of water can be hazardous in the following ways:
- It leads to the spread of waterborne diseases caused by bacteria.
- It could reduce the dissolved oxygen (DO) in water. Reduced oxygen availability has the potential to kill aerobic aquatic bacteria.
- Untreated sewage generates an unpleasant smell.
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