Much attention has been paid on the implementation of Anammox, including PN-A, SD-A, HD-A, Endogenous denitrification-A and now some attempts of integration of different units of these processes are under the way.

• Which one and for what consideration you would suggest trying more ?
• Or if there is other process/technology can replace Anammox with regarding to the carbon neutrality, energy-saving as well as recovery?