Which one of the following is an aerobic method of decomposing solid waste?
- ASanitary landfill
- BCompostingCorrect
- CIncineration
- DOpen dumping
Solution
Concept
Aerobic decomposition of waste
Step-by-step solution
1. Composting is the biological decomposition of organic waste by aerobic micro-organisms in the presence of air.
Explanation
In composting, aerobic bacteria break down organic matter into humus. Landfills decompose waste mainly anaerobically, incineration is thermal, and open dumping is uncontrolled.
Why the other options are wrong
Landfill is mainly anaerobic, incineration is combustion not biological decomposition, and open dumping is not a method of treatment.
Shortcut
Composting = aerobic; biogas digester = anaerobic.
Common mistake
Choosing incineration.
Correct answer: B) Composting