The liquid products of the separationprocess can be
treated further with evaporation, membrane filtration, or ammonia
stripping; however, to date, no low-maintenance and/or costefficient applications of these post-treatments have been demonstrated (Møller et al., 2000). Melse and Verdoes (2005) described
microfiltration of the centrifuged filtrate. Fugere et al. (2005)
described nanofiltration to treat the overflow from settling processes. With these approaches, 33% of the initial crude slurry volume was obtained, and the final permeate was suitable for reuse as
sanitary, safe industrial water. Ledda et al. (2013) studied nitrogen
and water recovery from animal slurries with a process that integrated ultrafiltration, reverse osmosis, and cold stripping. Pieters
et al. (1999) also implemented reverse osmosis at the farm scale