he SELCO-Ecopurin (Martinez-Almela and Barrera, 2005) separation technology has been used for five years on 12 livestock
farms in Spain, Italy, and the USA. The high recovery of solids
(>90%) made it economical to use advanced purification techniques
for the liquid. Karakashev et al. (2008) tested different processes for
reducing organic matter in pig manure