Nitrogen and phosphorus release from organic wastes and suitability as bio-based fertilizers in a circular economy
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Nitrogen and phosphorus release from organic wastes and suitability as bio-based fertilizers in a circular economy. / Case, Sean; Jensen, Lars Stoumann.
In: Environmental Technology (United Kingdom), Vol. 40, No. 6, 2019, p. 701-715.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Nitrogen and phosphorus release from organic wastes and suitability as bio-based fertilizers in a circular economy
AU - Case, Sean
AU - Jensen, Lars Stoumann
PY - 2019
Y1 - 2019
N2 - The drive to a more circular economy has created increasing interest in recycling organic wastes as bio-based fertilizers. This study screened 15 different manures, digestates, sludges, composts, industry by-products, and struvites. Nitrogen (N) and phosphorous (P) release was compared following addition to soil. Three waste materials were then ‘upgraded’ using heating and pressure (105°C at 220 kPa), alkalinization (pH 10), or sonification to modify N and P release properties, and compared in a second soil incubation. Generally, maximum N release was negatively correlated with the CN ratio of the material (r = −0.6). Composted, dried, or raw organic waste materials released less N (mean of 10.8 ± 0.5%, 45.3 ± 7.2%, and 47.4 ± 3.2% of total N added respectively) than digestates, industry-derived organic fertilizer products, and struvites (mean of 58.2 ± 2.8%, 77.7 ± 6.0%, and 100.0 ± 13.1% of total N added respectively). No analyzed chemical property or processing type could explain differences in P release. No single upgrading treatment consistently increased N or P release. However, for one raw biosolid, heating at a low temperature (105°C) with pressure did increase N release as a percentage of total N added to soil from 30% to 43%.
AB - The drive to a more circular economy has created increasing interest in recycling organic wastes as bio-based fertilizers. This study screened 15 different manures, digestates, sludges, composts, industry by-products, and struvites. Nitrogen (N) and phosphorous (P) release was compared following addition to soil. Three waste materials were then ‘upgraded’ using heating and pressure (105°C at 220 kPa), alkalinization (pH 10), or sonification to modify N and P release properties, and compared in a second soil incubation. Generally, maximum N release was negatively correlated with the CN ratio of the material (r = −0.6). Composted, dried, or raw organic waste materials released less N (mean of 10.8 ± 0.5%, 45.3 ± 7.2%, and 47.4 ± 3.2% of total N added respectively) than digestates, industry-derived organic fertilizer products, and struvites (mean of 58.2 ± 2.8%, 77.7 ± 6.0%, and 100.0 ± 13.1% of total N added respectively). No analyzed chemical property or processing type could explain differences in P release. No single upgrading treatment consistently increased N or P release. However, for one raw biosolid, heating at a low temperature (105°C) with pressure did increase N release as a percentage of total N added to soil from 30% to 43%.
KW - biosolid
KW - Compost
KW - digestate
KW - manure
KW - N mineralization
KW - P release
KW - struvite
U2 - 10.1080/09593330.2017.1404136
DO - 10.1080/09593330.2017.1404136
M3 - Journal article
C2 - 29125054
AN - SCOPUS:85034781917
VL - 40
SP - 701
EP - 715
JO - Environmental Technology
JF - Environmental Technology
SN - 0959-3330
IS - 6
ER -
ID: 193508916