Paper 1 · Paper 1
UGC NET June 2024 Re-Exam (30.08.2024) Shift-II
Which of the following has the highest Biological Oxygen Demand (BOD)?
ADrinking water
BUnpolluted surface water
CContaminated surface water
DMunicipal sewage effluent ✓ Correct
Correct answer: (D) Municipal sewage effluent — Municipal sewage effluent has the highest BOD, so that is the answer.
Explanation
★Municipal sewage effluent has the highest BOD, so that is the answer.
★BOD measures oxygen needed to break down organic matter.
★Sewage effluent is rich in organic waste.
★So bacteria consume the most oxygen decomposing it.
★Cleaner waters have far lower organic loads.
★Hence municipal sewage effluent is correct.
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