Nitrogen removal from wastewater with Liquiline ControlTo ensure that nitrogen can be safely and efficiently removed from wastewater, the nitrification and denitrification processes must be optimally coordinated with each other. The nitrification process depends on the exact supply of oxygen at any given time. If too little oxygen is introduced into the biological treatment, the strict limit values in the outlet cannot be complied with. Running the compressors constantly at full speed will result in enormous energy consumption.