What results from the biological oxygen demand (BOD)being high and the water becoming anaerobic?

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When the BOD is high and water becomes anaerobic, it means that there is high organic matter present in the water that bacteria are breaking down. This process requires oxygen, and when the oxygen is depleted, bacteria start using other sources such as nitrate or sulfate. When these are also depleted, bacteria that can survive without oxygen start to grow, producing methane and hydrogen sulfide gas. The accumulation of wastes in this situation can result in foul odor, damage to aquatic life, and potentially harm human health.

What Results from the Biological Oxygen Demand (BOD)being High and the Water