TY - JOUR
T1 - Phosphorus availability from the solid fraction of pig slurry is altered by composting or thermal treatment
AU - Christel, Wibke
AU - Bruun, Sander
AU - Magid, Jakob
AU - Jensen, Lars Stoumann
PY - 2014
Y1 - 2014
N2 - The alteration of easily available phosphorus (P) from the separated solid fraction of pig slurry by composting and thermal processing (pyrolysis or combustion at 300-1000. °C) was investigated by water and acidic extractions and the diffusive gradients in thin films (DGT) technique. Temporal changes in P availability were monitored by repeated DGT application in three amended temperate soils over 16. weeks. P availability was found to decrease in the order: drying. >. composting. >. pyrolysis. >. combustion with increasing degree of processing. Water extractions suggested that no P would be available after pyrolysis above 700. °C or combustion above 400. °C, respectively, but during soil incubation, even char and ash, processed at 800. °C, increased P availability. Low-temperature pyrolysis vs. combustion was found to favor P availability as did application to acidic vs. neutral soil. Composting and thermal treatment produced a slow-release P fertilizer, with P availability being governed by abiotic and biotic mechanisms.
AB - The alteration of easily available phosphorus (P) from the separated solid fraction of pig slurry by composting and thermal processing (pyrolysis or combustion at 300-1000. °C) was investigated by water and acidic extractions and the diffusive gradients in thin films (DGT) technique. Temporal changes in P availability were monitored by repeated DGT application in three amended temperate soils over 16. weeks. P availability was found to decrease in the order: drying. >. composting. >. pyrolysis. >. combustion with increasing degree of processing. Water extractions suggested that no P would be available after pyrolysis above 700. °C or combustion above 400. °C, respectively, but during soil incubation, even char and ash, processed at 800. °C, increased P availability. Low-temperature pyrolysis vs. combustion was found to favor P availability as did application to acidic vs. neutral soil. Composting and thermal treatment produced a slow-release P fertilizer, with P availability being governed by abiotic and biotic mechanisms.
KW - Combustion
KW - Diffusive gradients in thin films (DGT)
KW - Digestate compost
KW - Manure char
KW - Slow pyrolysis
U2 - 10.1016/j.biortech.2014.07.030
DO - 10.1016/j.biortech.2014.07.030
M3 - Journal article
C2 - 25089896
AN - SCOPUS:84905270172
SN - 0960-8524
VL - 169
SP - 543
EP - 551
JO - Bioresource Technology
JF - Bioresource Technology
ER -
