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Water Quality

Water Quality. Presented By: Group 2. River Water Quality. Dissolved Oxygen (mg O 2 /L) – is required to maintain a balanced community of organisms in lakes, rivers, and the ocean. Deoxygenation – the rate at which oxygen is consumed in oxidizing an oxygen-demanding waste.

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Water Quality

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  1. Water Quality Presented By: Group 2

  2. River Water Quality • Dissolved Oxygen (mg O2 /L) – is required to maintain a balanced community of organisms in lakes, rivers, and the ocean. • Deoxygenation – the rate at which oxygen is consumed in oxidizing an oxygen-demanding waste. • Reaeration – the rate at which the oxygen is resupplied from the atmosphere.

  3. Oxygen Saturation and Deficit • Saturation concentration (DOsat) – the amount of oxygen that can be dissolved in water at a given temperature. • Henry’s law constant (Kh)– (1.36 x 10-3 moles/L-atm at 20°C) • Partial pressure of oxygen in the temperature (PO2) – 21 percent or 0.21 atm

  4. Formula for DOsat: DOsat = Kh x PO2 Formula for D: D = DOsat – DOact where: D = oxygen deficit DOact = ambient DO conc. from saturation

  5. Example 8.2 • Determine the saturation dissolved-oxygen concentration, Dosatat 20°C. Solution: Dosat= 1.36 x 10-3 mole/L-atm x 0.21 atm = 2.85 x 10-4 mole / L Convert to mg O2/L: Dosat= 2.85 x 10-4 mole/L x 32 g O2/mole x 103 mg O2 mole O2 g O2 = 9.1 mg O2 /L

  6. Example 8.3 • Determine the dissolved-oxygen deficit, D, at 20°C for a river with an ambient dissolved-oxygen concentration of5 mg O2/L. Solution: D = 9.1 – 5 = 4.1 mg O2/L

  7. Wetlands • A site may be characterized as wetland if it is: • Is inundated and saturated with water for at least part of the year. • Has hydric soils • Supports predominantly hydrophytic plants

  8. Wetlands • Serve several important functions: - water storage and flood mitigation - filtration of water and removal of 1 suspended solids, bacteria, nutrients and toxic substances - wildlife habitat - biogeochemical cycling of materials - removes substances that may impair water quality

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