Jørgensen and Jensen (2009) investigated the chemical and
biochemical properties of solids collected from 47 commercial pig
manure slurry separation plants that separated liquid manure into
a nutrient-rich solid fraction and a nutrient-poor liquid fraction.
The samples originated from five different types of separation
technologies that processed pig manure and anaerobically digested
manure. The largest variations found in the measured chemical and
biochemical characteristics of the samples were the contents of ash,
total P, total C, the SS, and the C distribution in the biochemical
fractions