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Student BOD Lab

Student BOD Lab. Fig. 20-5 Dilution and decay of wastes. Investigating BOD Amount of dissolved oxygen needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature over a specified time period. Distilled water. Pollutant (milk ). yeast.

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Student BOD Lab

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  1. Student BOD Lab

  2. Fig. 20-5 Dilution and decay of wastes

  3. Investigating BOD Amount of dissolved oxygen needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature over a specified time period Distilled water Pollutant (milk) yeast Color Indicator

  4. Investigating BOD Amount of dissolved oxygen needed by aerobic decomposers to break down the organic materials in a given volume of water at a certain temperature Initial Demonstration Both started Dark Blue- Picture taken after 10 min at 28deg Celcius-(84 F) Test Tube B contains 10ml milk, yeast and methylene Blue Test Tube A the control contains distilled water, yeast and methylene Blue

  5. Initial Demonstration Both started Dark Blue- Picture taken after 20 min at 28deg Celcius-(84 F)

  6. 8AM Initial setup with series of dilutions containing degrees of pollutants Level of O2 high-indicated by blue color (BOD)Control 1/16 1/8 ¼ ½ full concentration

  7. After about 1 hr the tubes began to change color. Why are those to the left darker? (BOD) Control 1/16 1/8 ¼ ½ full concentrationm milk

  8. Ultimate results BOD level obvious G Greater the BOD stronger the reattion… More white… the more oxygen present (BOD) Control 1/16 1/8 ¼ ½ full concentration milk

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