A review on nitrogen dynamics and mitigation strategies of food waste digestate composting.

Bioresource Technology
M K ManuJonathan W C Wong

Abstract

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.

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Citations

Jun 25, 2021·Bioresource Technology·Samir Kumar KhanalHans Oechsner
Jul 30, 2021·Journal of Environmental Management·Sridhar PilliRajeshwar Dayal Tyagi

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