dissolved oxygen, DO) is an organic compound in water, bacteria need oxygen (aerobic bacteria) to decompose inorganic. The bacteria need oxygen, this will be the amount of oxygen dissolved in water decreases. So in clean water and waste water is precious DO DO is the low standard of water quality is typically about 5-8 ppm DO value or volume of dissolved O2 5-8 mg / liter or 5. -8 ppm wastewater will be less than 3 ppm DO DO was important to indicate that the water is low in oxygen
to meet the needs of living things or not.
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