TY - JOUR
T1 - A review on nitrogen dynamics and mitigation strategies of food waste digestate composting
AU - Mathikere Krishnegowda, Manu
AU - Li, Dongyi
AU - Luo, Liwen
AU - Zhao, Jun
AU - Varjani, Sunita
AU - Wong, Jonathan W.C.
N1 - Funding Information:
The authors would like to thank the financial support from the National Natural Science Foundation of China (No. 51978595).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/8
Y1 - 2021/8
N2 - Food waste digestate is a by-product of the anaerobic digestion of food waste. Presence of high ammonium nitrogen content significantly increase the nitrogen loss upon direct application on soil or by conventional composting. In this review, a comprehensive discussion regarding the effective management of food waste digestate is outlined, in which global food waste digestate production, characteristics, and composting are discussed. The nitrogen dynamics cycle considering high ammonium nitrogen content in the digestate is also evaluated, including ammonification, nitrification, denitrification, and other possible mechanisms based on the current literature. Mitigation strategies for reducing nitrogen loss via C/N ratio adjustment and the addition of physical, chemical, and microbial amendments were evaluated and estimated for 15 countries based on the available data on food waste anaerobic digestion plants. Reduced nitrogen loss and high quality compost could be produced from food waste digestate by adapting mitigation strategies.
AB - Food waste digestate is a by-product of the anaerobic digestion of food waste. Presence of high ammonium nitrogen content significantly increase the nitrogen loss upon direct application on soil or by conventional composting. In this review, a comprehensive discussion regarding the effective management of food waste digestate is outlined, in which global food waste digestate production, characteristics, and composting are discussed. The nitrogen dynamics cycle considering high ammonium nitrogen content in the digestate is also evaluated, including ammonification, nitrification, denitrification, and other possible mechanisms based on the current literature. Mitigation strategies for reducing nitrogen loss via C/N ratio adjustment and the addition of physical, chemical, and microbial amendments were evaluated and estimated for 15 countries based on the available data on food waste anaerobic digestion plants. Reduced nitrogen loss and high quality compost could be produced from food waste digestate by adapting mitigation strategies.
KW - Composting
KW - Denitrification
KW - Food waste digestate
KW - Gaseous emission
KW - Nitrification
UR - http://www.scopus.com/inward/record.url?scp=85105307777&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2021.125032
DO - 10.1016/j.biortech.2021.125032
M3 - Review article
C2 - 33964812
AN - SCOPUS:85105307777
SN - 0960-8524
VL - 334
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 125032
ER -
