A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
Correct answer: B. Septic tank
- A. Cesspool
- B. Septic tank
- C. Skimming mill
- D. Lagoon
Explanation
A septic tank is an underground masonry or concrete chamber in which sewage undergoes anaerobic decomposition. A cesspool mainly stores sewage, whereas a lagoon is a larger treatment pond.
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