23.microbe.biorem.pt.10

23.microbe.biorem.pt.10 - Microbial Degradation and...

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Microbial Degradation and Bioremediation Pat Tomco ptomco@ucdavis.edu March 3, 2010 Agricultural and Environmental Chemistry Graduate Group http://agchem.ucdavis.edu
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Outline Introduction Types of Respiration Processes Some Types of Biodegradation Reactions Bioremediation Strategies Summary and Conclusions
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I. Introduction Most microbes live in soils and sediments. There is literally over a million species. To date less than 5% have been characterized. They use soil organic matter as their carbon source. Soil Air
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II. Types of Respiration Processes Processes depend upon the terminal electron acceptors for respiration. Communities include those in the photic, oxic and anoxic zones. Redox potential determines viability of any e- acceptor.
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Types of Microbes in the Environment Aerobic (a) – use O 2 for respiration. Anaerobic (b) – use other electron acceptors. Facultative (c) – can grow either way (“switch hitters”). Microaerobic (d) – need only a small amount of O 2 . Aerotolerant (e) – anaerobic but can tolerate O 2 .
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Temperature and pH Influences Microbes generally have a temperature optimum at which metabolic rate is maximal (15-45 o C). While they best function at pH 5.5 – 8.5, some can tolerate extreme acidic (acidophiles) or basic (alkaliphiles)
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Optimal Growth Conditions Region 1: lag phase – microbes are adjusting to new substrate (carbon source). Region 2:
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23.microbe.biorem.pt.10 - Microbial Degradation and...

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