Environment & Ecology · Environmental Engineering
Which of the following represents the active biological layer formed at the top of a slow sand filter bed?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Autotrophic zone
- 2Schmutzdecke zone✓
- 3Heterotrophic zone
- 4Electrolytic zone
Correct answer
Schmutzdecke zone
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