Chapter 5 

Overview of Dissolved Oxygen and Natural Purification

    •  Through photosynthesis, plant life produces a significant amount of oxygen.
    • The process of respiration removes oxygen from water.

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    • Oxygen entering the water through contact with the atmosphere is reaeration.

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    • Dissolved Oxygen --DO -- levels determine the amount of life a water system can sustain.

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    • Temperature, light turbidity, color, salinity, turbulence decomposition and organisms all affect DO.

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    • Waste discharge causes decomposers to multiply and consume more oxygen.

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    • The ability of a body of water to handle wastewater depends on volume and strength of the waste, flow, climate, temperature and other factors.

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    • Downstream of a discharge there is a recovery zone where species that are more disease tolerant exist.

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