In this paper the sustainability of current available and future nitrogen removal systems has been investigated. For the assessment of the sustainability six indicators were used; sludge production; energy consumption, resource recovery; area requirement and N2O-emission. For the evaluation of the position of the individual nitrogen removal systems in the anthropogenic nitrogen cycle a broad outline for a life-cycle analysis has been presented.
MULDER, A . (2003): The Quest for Sustainable Nitrogen Removal Technologies. In: Water Science and Technology: Volume 48 , 67–75. URL [Accessed: 26.06.2012]