13-10-2012, 05:01 PM
Wastewater Treatment
wastewater treatment--.ppt (Size: 4.35 MB / Downloads: 162)
Secondary Treatment
Utilize organic matter to supply their carbon and energy needs.
These are the predominant organisms in biological wastewater treatment plants, responsible for converting organic pollutants to
carbon dioxide,
water, and
additional heterotrophic biomass.
get their energy from an inorganic source and
their carbon from carbon dioxide.
An example of autotrophs in wastewater treatment is nitrifying bacteria.
Nitrifiers use ammonia for energy and carbon dioxide for a carbon source.
End products of nitrification are
nitrate,
water, and
hydrogen ions
additional nitrifying (autotrophic) biomass.
Terminal electron acceptor
microorganisms transfer electrons from the energy source to oxygen, O2.
In the process oxygen and organic matter is converted to carbon dioxide, CO2, and water, H2O.
Oxygen is termed the terminal electron acceptor or TEA.
utilize CO2 and organic compounds as terminal electron acceptors.
In this process, organic compounds are converted to fermentation products and carbon dioxide.
In anaerobic digestion of wastewater solids, the fermentation products are converted to
methane,
CH4,
and carbon dioxide