21 Water Quality Parameters 12

21 Water Quality Parameters 12 - Biological activity Oxygen...

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SO 4 -2 HS - O 2 NO 3 - SO 4 -2 Respiration and Still Ponds C 6 H 12 O 6 + 3 SO 4 2- + 3H + = 6HCO 3 - + 3 HS - Heterotrophic Organisms oxygen Aerobic heterotrophs consume oxygen Anaerobic heterotrophs Use nitrate instead of O 2 Anaerobic heterotrophs Use sulfate instead of O 2
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Temperature and Oxygen The solubility of oxygen in water is highly temperature dependent. Saturated Oxygen Content 10.1 mg/L 8.3 mg/L 15 o C 25 o C Affects species diversity
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Cold water species: 5-6 mg/L Trout Cool water species: 4 mg/L Pike Warm water species: 2-3 mg/L Bass, Catfish, Bluegill Fish Species Minimum Oxygen Tolerances
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Warm Water High biotic activity High demand on oxygen Decreased oxygen content Slow diffusion of oxygen Oxygen contents can affect the form, solubility, or toxicity of important contaminants Heat also increases
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Unformatted text preview: Biological activity Oxygen Oxygen is water soluble, but its solubility is temperature-dependent. In the atmosphere, about one out of 5 molecules is oxygen; in water, about one out of every 100,000 molecules is oxygen. Oxygen enters the water body from the atmosphere (slowly) and from photosynthesis near the surface Oxygen leaves the water column principally by organism respiration. Higher temperatures increase biotic activity, decreasing oxygen Higher temperatures decrease the ability of water to hold or contain O 2 . Oxygen status affects microbial populations and other species diversity as well as the availability or toxicity of important water contaminants....
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21 Water Quality Parameters 12 - Biological activity Oxygen...

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