3
Which matter presence is indicated by means of biological oxygen demand?
EXPLANATION
Organic Waste Characterization
- Biochemical Oxygen Demand (BOD) Indicator:
- Definition: Biochemical Oxygen Demand (BOD$_5$) is the empirical measurement of the mass of dissolved oxygen consumed by aerobic microorganisms at $20^\circ\text{C}$ over 5 days to decompose biodegradable carbonaceous compounds.
- Indication: Elevated BOD directly indicates high concentrations of biodegradable organic matter (sugars, proteins, lipids, starches) in agricultural, municipal, and agro-processing wastewaters.
- Conclusion: Organic matter (Option 1).
Correct option: (1) Organic matter
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