Sector operation review on pig slurry treatment with phase separation in reed-planted beds for drying and composting

The Economic Interest Grouping farm of Villefranche Grand Sud (farrow-to-finish operator with 140 sows) is equipped with 1200 m² of reed-planted beds for dehydrating the mud from the biological treatment of pig slurry. The full-scale implementation of separation in phases in reed-beds has made it possible to demonstrate that this technique has been mastered. The mud from these beds (19% dry matter) is then composted either with milled green waste or with cow manure low in straw content.Experimentally, several windrows of different concentrations were erected. In order for composting to occur, there must be an addition of green waste of over 30%. Cow manure low in straw content did not prove to be a good cosubstrate. Additional studies are needed to obtain compost in conformity with standard NFU 44051 standard.The use of other cosubstrates must also be studied.