REdstack - Model EDBM - Cross-Flow Stack - Brochure

In anaerobic digester processes, there is often a lot of NH4 + available. When the digestate is dewatered this NH4 + needs to be removed from the dewatered sludge. In some cases the NH4 + needs to be removed, because the concentrations are so high that they are toxic to the biology, for example with chicken manure digestion. For removal of NH4 + strippers are used, to strip the NH4 + out of the water, with addition of caustic and heat. The stripped NH4 + is then washed in a scrubber with H2SO4, and normally trucked away as (NH4)2SO4 fertilizer.