Dissolved O2
- min. required levels ➡️ 8ppm or 8 mg/L
- <4ppm ➡️ polluted water body
- Need
- respiration by aquatic animals
- decomposition of organic waste
Bio-chemical Oxygen Demand
- amount of dissolved oxygen
- needed by aerobic biological organisms
- to break down organic material present.
- a gauge of the effectiveness of wastewater treatment plants.
- ⬆️ organic matter ∝ BOD