Site author Richard Steane
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The BioTopics website gives access to interactive resource material, developed to support the
learning and teaching of Biology at a variety of levels.
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Name of stage | Type of micro-organism |
Aerobic or anaerobic? |
Time taken |
Temperature | Resulting compounds |
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Anaerobic digestion |
bacteria
(Methanobacterium) |
anaerobic | 2-3 weeks | 30-40°C | methane,CO2, Hydrogen |
Activated sludge | bacteria, protoctists,fungi | aerobic | 8 hrs | ambient? | CO2, soluble salts |
Trickling filter | bacteria, fungi, protoctists | aerobic | days/hours? | ambient? | CO2, soluble salts |
carbon compounds | hydrogen sulphide (H2S) | ammonium ions (NH4+) |
carbon dioxide CO2 escapes into air |
sulphates (SO42-) (mineral ions) dissolved in liquid |
nitrates (NO3-) (mineral ions) dissolved in liquid |