The metal finishing industry waste usually has the ___ BOD loading on receiving waters.

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Multiple Choice

The metal finishing industry waste usually has the ___ BOD loading on receiving waters.

Explanation:
Biological oxygen demand (BOD) measures how much oxygen microorganisms would use to degrade biodegradable organic matter in water. Metal finishing waste is dominated by inorganic substances—metal salts, acids or bases, cyanides, detergents—rather than biodegradable organics. Because there isn’t a large amount of readily decomposable organic carbon in these discharges, the amount of oxygen consumed by bacteria is relatively small, so the BOD loading seen by receiving waters tends to be low. While COD can be higher due to oxidizable inorganic components, BOD remains low, making the metal finishing waste typically the lowest in BOD loading among common industrial effluents.

Biological oxygen demand (BOD) measures how much oxygen microorganisms would use to degrade biodegradable organic matter in water. Metal finishing waste is dominated by inorganic substances—metal salts, acids or bases, cyanides, detergents—rather than biodegradable organics. Because there isn’t a large amount of readily decomposable organic carbon in these discharges, the amount of oxygen consumed by bacteria is relatively small, so the BOD loading seen by receiving waters tends to be low. While COD can be higher due to oxidizable inorganic components, BOD remains low, making the metal finishing waste typically the lowest in BOD loading among common industrial effluents.

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