Topics:
Animal Refresher, Meat Science
Effluent Treatment in Abattoir
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Question (English)
Which is true about the effluent treatment of abattoir?
- Both: Biological filters reduce BOD by 95% AND primary treatment reduces BOD by 75–80% ✓ Correct
- Biological filters are efficient in reducing BOD by 95% only
- BOD of effluent is reduced by 75–80% during primary treatment only
- None of the above
Explanation:
Correct Answer: Both statements are true
Both facts about abattoir effluent treatment are correct:
Effluent Treatment Steps
- Primary Treatment: Physical separation of solid waste (screening, sedimentation). Reduces BOD by 75–80%.
- Secondary Treatment (Biological Filters): Biological oxidation of remaining organic matter. Reduces BOD by 95%.
Abattoir Effluent Characteristics
- Average BOD: 1500–2000 mg/litre — much higher than domestic sewage (~300 mg/litre).
- High BOD is due to blood, gut contents, fat, and tissue fragments.
Effluent Treatment Sequence
- Screening → removes large solids.
- Sedimentation → removes suspended particles (primary treatment; BOD ↓ 75–80%).
- Biological filtration → microbial breakdown of organic matter (secondary treatment; BOD ↓ 95%).
- Final effluent disposal into water bodies.
📚 About this Topic — Animal Refresher
This multiple choice question is from Animal Refresher, Meat Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
