Question

Mention any two harmful effects of sewage.

Hint:

Proper sewage treatment is essential for preventing water contamination and environmental degradation.

Answer 1

Sewage, when not properly treated, can have several harmful effects on the environment and human health. Step 1: Harmful effects of sewage.
1. Water contamination.
Sewage can contaminate water sources with harmful bacteria, viruses, and chemicals, leading to waterborne diseases. 2. Eutrophication.
Nutrients in sewage (such as nitrogen and phosphorus) can promote algae growth in water bodies, leading to eutrophication and oxygen depletion.
Final Answer: 1. Water contamination with pathogens. 2. Eutrophication leading to oxygen depletion.