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Nature of ecosystems

Nature of ecosystems. Energy flow – microbes are decomposers Water Carbon Nitrogen. Nitrogen Fixing Bacteria. Nitrifying Bacteria N 2 to NH 3 Cyanobacteria Methylotrophic bacteria Rhizobium – symbiotic. Water Pollution. Chemical Biological Indicator organism – E. coli.

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Nature of ecosystems

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  1. Nature of ecosystems • Energy flow – microbes are decomposers • Water • Carbon • Nitrogen

  2. Nitrogen Fixing Bacteria • Nitrifying Bacteria • N2 to NH3 • Cyanobacteria • Methylotrophic bacteria • Rhizobium – symbiotic

  3. Water Pollution • Chemical • Biological • Indicator organism – E. coli

  4. Coliform Tests • Membrane Test • Water is filtered • ______________ is placed on agar • Colonies are counted • MUG (ONPG) Test • Fluorescence (yellow color) indicates E. coli presence

  5. Sewage Treatment • Sewage – used water • Primary • Solids separated from liquid • Floating ____________ is shredded • Skimmers remove ___________________ • ___________________ recovered • Organic solids (__________) removed

  6. Trickling filtration Sewage aerated by spraying Moves over a layer of aerobic microbes on rocks 80% removal of organic matter (BOD) Activated sludge treatment Air is pumped into liquid in a tank Microbes are added as a sludge and decompose organic material Secondary Sewage treatment

  7. Tertiary Sewage Treatment • Filters can remove the last 5-20% of organics • Costly process • Applications:

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