Chapter 4: Activated Sludge Modelling - IqTMA-UVa

Processes for Biological NitrogenRemoval: Process configurationA) Modified Ludzack Ettinger • Energy savings in aeration bythe use of NO 3-for BOD removal• Saving in alkalinity addition• 5-8 mg N e/L are possible• Potential problems of bulkingSRT 7-20 d; HRT anox1-3 h; HRT aer4-12 h; IR 2-4B) Step feed MLE• The above mentioned advantages• Take advantage of the highMLVSS in the first stages• 5-8 mg N e/L are possible• Potential problems of bulking54