Discussion
BOD value of sewage indicates :
Answer: C
A BOD value indicates the high organic matter content of sewage.
Biochemical oxygen demand is the amount of dissolved oxygen that microorganisms consume while breaking down the biodegradable organic matter in a sample, usually over five days at 20°C. The more organic matter, the more oxygen the microbes use, so a high BOD means heavily polluted, organic-rich water. Raw domestic sewage typically has a BOD of 200 to 300 mg/L.
The microbial load is counted directly by plate counts or MPN tests. Low oxygen content is measured as dissolved oxygen (DO), a different parameter. The test does depend on aerobic microbes, which may even be seeded into the bottle, but BOD measures the food they consume, not their presence.
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