Process for utilizing liquid manure material

A process of recovering ammonia values from ammonium-containing effluent which contains soluble constituents and, possible additional solids, comprising:

• a) optionally, separating off the solids,
• b) concentrating a substantially solids-free ammonium-containing effluent to give an aqueous concentrate having an increased content of ammonium and additional soluble constituents, with simultaneous recovery of substantially ammonium-free pure water,
• c) precipitating ammonium as magnesium ammonium phosphate from the ammonium-containing aqueous concentrate, and
• d) separating off precipitated magnesium ammonium phosphate with recovery of substantially ammonium-free residual concentrate which at least partially contains the additional soluble constituents,
• wherein the solids are separated by ultrafiltration and wherein the ammonium-containing aqueous concentrate has an ammonium content of 5 to 50 g/l before precipitating and the precipitated ammonium consists of at least 90% by weight of magnesium ammonium phosphate.