Side-stream Ammonia Stripping of Food Waste Anaerobic Digestion

A. Serna-Maza, S. Heaven & C.J. Banks
Three 35-L anaerobic digesters fed on source segregated food waste were coupled to side-stream ammonia stripping towers and operated semi-continuously over a period of 380 days, with results in terms of performance and stability compared to those of a control digester without stripping. The process used biogas as the stripping medium, with ammonia recovered by passing the gas phase through water and H2SO4 traps and the stripped liquor then returned to the digester. The stripping...