TY - JOUR
T1 - Carbon, nitrogen, and phosphorus distribution in particle size–fractionated separated pig and cattle slurry
AU - Peters, Karin
AU - Hjorth, Maibritt
AU - Jensen, Lars Stoumann
AU - Magid, Jakob
PY - 2011/1
Y1 - 2011/1
N2 - Solid liquid separation of animal slurry is a method to reduce the excess nutrient loads from intensive livestock production. Five different separation technologies (sedimentation, centrifugation, pressurized filtration, polymer flocculation and drainage, and iron chloride addition + polymer flocculation and drainage) were applied to pig and cattle slurry in a laboratory study. Separation efficiencies of mass, dry matter (DM), N, and P were measured. Particle size fractionation of the solid fractions was performed by subjecting them to wet fractionation and C, organic N (Norg), and P contents were subsequently measured. Chemical pretreatment with polymer before gravity drainage separated DM, total N, and P from raw pig and cattle slurry with the highest efficiencies. Sedimentation and centrifugation separated P from pig and cattle slurries with higher simple separation efficiencies (0.77 and 0.70, respectively) compared with pressurized filtration (0.15 and 0.37). Pressurized filtration transferred the lowest masses (14 and 18%) to the solid fractions. Solid fractions from pig slurry generally contained higher concentrations of P and C compared with cattle slurry solid fractions. The majority of C in solid fractions was present in particles >25 μm, whereas N and P were present in larger proportions in particles <25 μm. Chemical pretreatment increased the capture of smaller Norg- and P-rich particles into larger particles between 25 and 1000 μm.
AB - Solid liquid separation of animal slurry is a method to reduce the excess nutrient loads from intensive livestock production. Five different separation technologies (sedimentation, centrifugation, pressurized filtration, polymer flocculation and drainage, and iron chloride addition + polymer flocculation and drainage) were applied to pig and cattle slurry in a laboratory study. Separation efficiencies of mass, dry matter (DM), N, and P were measured. Particle size fractionation of the solid fractions was performed by subjecting them to wet fractionation and C, organic N (Norg), and P contents were subsequently measured. Chemical pretreatment with polymer before gravity drainage separated DM, total N, and P from raw pig and cattle slurry with the highest efficiencies. Sedimentation and centrifugation separated P from pig and cattle slurries with higher simple separation efficiencies (0.77 and 0.70, respectively) compared with pressurized filtration (0.15 and 0.37). Pressurized filtration transferred the lowest masses (14 and 18%) to the solid fractions. Solid fractions from pig slurry generally contained higher concentrations of P and C compared with cattle slurry solid fractions. The majority of C in solid fractions was present in particles >25 μm, whereas N and P were present in larger proportions in particles <25 μm. Chemical pretreatment increased the capture of smaller Norg- and P-rich particles into larger particles between 25 and 1000 μm.
U2 - 10.2134/jeq2010.0217
DO - 10.2134/jeq2010.0217
M3 - Journal article
SN - 0047-2425
VL - 40
SP - 224
EP - 232
JO - Journal of Environmental Quality
JF - Journal of Environmental Quality
IS - 1
ER -