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Article

The Potential of Digestate and the Liquid Fraction of Digestate as Chemical Fertiliser Substitutes under the RENURE Criteria

1
Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium
2
European Biogas Association, Rue d’Arlon 65, 1050 Brussels, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: David Houben
Agronomy 2021, 11(7), 1374; https://doi.org/10.3390/agronomy11071374
Received: 31 May 2021 / Revised: 1 July 2021 / Accepted: 2 July 2021 / Published: 7 July 2021
This study assessed how digestate and the liquid fraction (LF) of digestate would perform as candidate RENURE fertilisers (recovered nitrogen from manure) in nitrate vulnerable zones under the proposed criteria of the Joint Research Centre, namely, (i) a mineral nitrogen to total nitrogen ratio ≥ 90% (Nmin:TN ≥ 90%) or a total organic carbon to TN ratio ≤ 3 (TOC:TN ≤ 3); (ii) limits of ≤300 copper (Cu) mg kg−1 and ≤800 Zinc (Zn) mg kg−1. These criteria were applied to unpublished data (n = 2622) on digestate compositional properties, further amended with data from the literature (n = 180); digestate analysis from seven full-scale biogas facilities (n = 14); and biogas industry stakeholders (n = 23). The results showed that Cu and Zn mostly met the criteria, with compliance rates of 94.7% (of 1035 entries) and 95.0% (of 1038 entries), respectively. Just above 5% (of 1856 entries) met the Nmin/TN ≥ 90% criterion, while 36% (of 1583 entries) met the TOC/TN ≤ 3 criterion, while total compliance was 32% (of 1893 entries). When targeting the LF, total compliance increased noticeably, between 43 and 58% depending on DM range, indicating that LFs are better suited RENURE candidate fertilisers than unseparated digestate. View Full-Text
Keywords: RENURE; digestate; manure; Nitrates Directive; SAFEMANURE; NUE; NFRV; liquid fraction; circular economy RENURE; digestate; manure; Nitrates Directive; SAFEMANURE; NUE; NFRV; liquid fraction; circular economy
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MDPI and ACS Style

Reuland, G.; Sigurnjak, I.; Dekker, H.; Michels, E.; Meers, E. The Potential of Digestate and the Liquid Fraction of Digestate as Chemical Fertiliser Substitutes under the RENURE Criteria. Agronomy 2021, 11, 1374. https://doi.org/10.3390/agronomy11071374

AMA Style

Reuland G, Sigurnjak I, Dekker H, Michels E, Meers E. The Potential of Digestate and the Liquid Fraction of Digestate as Chemical Fertiliser Substitutes under the RENURE Criteria. Agronomy. 2021; 11(7):1374. https://doi.org/10.3390/agronomy11071374

Chicago/Turabian Style

Reuland, Gregory, Ivona Sigurnjak, Harmen Dekker, Evi Michels, and Erik Meers. 2021. "The Potential of Digestate and the Liquid Fraction of Digestate as Chemical Fertiliser Substitutes under the RENURE Criteria" Agronomy 11, no. 7: 1374. https://doi.org/10.3390/agronomy11071374

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