Valorisation of Phosphorus Extracted from Dairy Cattle Slurry and Municipal Solid Wastes Digestates as a Fertilizer

摘要: Phosphorus is a vital cell component and an essential irreplaceable element. Yet at the current rate of exploitation, phosphate’s reserves will be fast depleted. Dairy cattle slurry digestates from anaerobic digestion municipal solid wastes (MSW) are organic containing phosphorus which can potentially used as secondary source this nutrient. The present study investigated effect pH in release these using acid base extraction followed by recovery via precipitation, targeting production fertilizer. Results showed that when HNO3, 100 % P content was extracted dairy (2.0 < pH < 3.3) 90 % MSW (1.2 < pH < 1.5). maximum obtained after 2.5 h for 48 h digestates. efficiencies NaOH were only 22 % (12.9 < pH < 13.4) 9 % MWS (13.0 < pH < 13.4). precipitation solutions carried out molar ratio 1:1:1 Mg:N:P around 8.0. Analysis harvested precipitates XRD SEM–EDS ruled formation struvite, but validated amorphous calcium phosphates, potential fertilizer help to close cycle During process, heavy metals might become enriched precipitates. In perspective producing undesirable one should taken into account considering wastes.