However, it is also known that effective operation
of biological treatment systems relies on highly active microorganisms
carrying out the process, and therefore on the ratio of
resistant/sensitive microorganisms to the contaminant being treated
(depending on both its chemical nature and concentration).
Microorganisms can degrade a wide variety of organic contaminants
and can adapt to many different inhospitable environments.
However, there are a variety of pollutants, both man made
(xenobiotic) and natural, that are not easy to degrade biologically,
even over long periods of time -these are referred to as ‘‘refractory
or recalcitrant’’.
However, it is also known that effective operationof biological treatment systems relies on highly active microorganismscarrying out the process, and therefore on the ratio ofresistant/sensitive microorganisms to the contaminant being treated(depending on both its chemical nature and concentration).Microorganisms can degrade a wide variety of organic contaminantsand can adapt to many different inhospitable environments.However, there are a variety of pollutants, both man made(xenobiotic) and natural, that are not easy to degrade biologically,even over long periods of time -these are referred to as ‘‘refractoryor recalcitrant’’.
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