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Biogas residues in substitution for chemical fertilizers: Converting organic waste into resource

par Tsachidou, Bella ;Daigneux, B.;Hissler, Christophe;George, Isabelle ;Delfosse, Philippe
Référence European Biomass Conference and Exhibition Proceedings, page (1694-1700)
Publication Publié, 2019-01-01

Article révisé par les pairs

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Résumé :

Conversion of waste biomass to resource, through the environmentally sound multipurpose process of anaerobic digestion, allows the sustainable organic waste management, bioenergy and biofertilizer production, and therefore facilitates the transition to circular economy and mitigation of environmental pollution. The goal of this study was to assess and compare the agricultural performance parameters of biogas residues (BRs) and chemical fertilizers (CFs) while monitoring the residual nitrate accumulation under repeated application on a grassland in the Walloon Region of Belgium over the period 2013-2018. The results showed that BRs produced the same yield as CFs and could lead to similar N uptake after five years of application. Nitrogen fertilizer replacement value (NFRV) of BRs tended to increase over time, while in the last year of the experiment raw digestate demonstrated a NFRV of 99.9% in substitution for ammonium nitrate. The high nitrogen rate tested inhibited N uptake and yield for both BRs and CFs. Finally, BRs did not cause significant nitrate accumulation in the soil compared to CFs while repeated application of CFs indicated a cumulative effect. These results strongly advocate for the agricultural and environmental benefits of BRs and underline their suitability as substitutes for CFs in similar grassland systems.