Aeration is a common way to ...

Aeration is a common way to remove ammonia from water (https://www.gewater.com/handbook/ext_treatment/ch_4_aeration.jsp)

This is a good article in relation to the nitrification process and how aeration facilitates ammonia removal. 

http://www.drydeninformationcentre.com/aeration-of-lagoons-for-landfill-leachate-treatment-manual

The most efficient way to do this is through fine and ultrafine bubble generation. Ultrafine bubbles remain suspended in the water for up to several days, thus significantly reducing the amount of energy required to operate. 

I am experienced in fine and ultrafine bubble generation technologies and their applications for ammonia removal in wastewater treatment in Asia and Australia. If you would like to know more, email me at andrew@waterandoilsolutions.com.au