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<ul><li>The biological oxygen demand is defined as the ‘measure of dissolved oxygen required to decompose the organic matt...
<ul><li>Since most aquatic organisms need oxygen to carry out anaerobic respiration/ photosynthesis… </li></ul><ul><li>Wat...
<ul><li>Rapid waters can rapidly replenish Oxygen supply due to its fast flow </li></ul><ul><li>Lakes are less efficient a...
Element Aerobic Decay Product Anaerobic decay product C CO 2 CH 4 N NO 3 NH 3 H H 2 O CH 4,  NH 3 , H 2 S, H 2 O S SO 4 ²-...
 
<ul><li>Thermal pollution is the ‘degradation of water quality by any process that changes  ambient  water temperature’ </...
<ul><li>1. Careless discharge of heated water – i.e. in industrial places </li></ul><ul><li>2. Removal of shading vegetati...
 
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Biological Oxygen Demand

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Biological Oxygen Demand

  1. 2. <ul><li>The biological oxygen demand is defined as the ‘measure of dissolved oxygen required to decompose the organic matter in water biologically’ </li></ul><ul><li>Normally, it is measured over 5 days </li></ul>
  2. 3. <ul><li>Since most aquatic organisms need oxygen to carry out anaerobic respiration/ photosynthesis… </li></ul><ul><li>Water with High BOD, but can’t replenish oxygen fast enough, won’t be able to meet the needs of the aquatic community… </li></ul><ul><li>… Hence they will eventually suffocate </li></ul>
  3. 4. <ul><li>Rapid waters can rapidly replenish Oxygen supply due to its fast flow </li></ul><ul><li>Lakes are less efficient at doing this </li></ul><ul><li>Pure water BOD = 1 ppm </li></ul><ul><li>Polluted water BOD = 5 ppm or above </li></ul>
  4. 5. Element Aerobic Decay Product Anaerobic decay product C CO 2 CH 4 N NO 3 NH 3 H H 2 O CH 4, NH 3 , H 2 S, H 2 O S SO 4 ²- H 2 S P PO 4 ³- PH 3
  5. 7. <ul><li>Thermal pollution is the ‘degradation of water quality by any process that changes ambient water temperature’ </li></ul>
  6. 8. <ul><li>1. Careless discharge of heated water – i.e. in industrial places </li></ul><ul><li>2. Removal of shading vegetation </li></ul>

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