Which of the following in sewage treatment removes suspended solids?
Correct answer: B. Primary treatment
- A. Secondary treatment
- B. Primary treatment
- C. Sludge treatment
- D. Tertiary treatment
Explanation
Primary or physical treatment is the process of removal of small and large, floating and suspended solids from sewage through two processes of filtration and sedimentation.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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