Ammonia stripping (1)

A physicochemical process :
A liquid mixture including ammonia is contacted with air to transfer ammonia from liquid to the gas phase at high temperature and pH

Ammonium ions are converted to ammonia gas:
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Lime (CaO) or caustic (NaOH) is added to the wastewater until the pH reaches 10.8 to 11.5

Stripped ammonia can be absorbed to an acid

Fertilizer production
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ammonia13 image Source: IEA, 2015