Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Reuland, Gregory; Sigurnjak, Ivona; Dekker, Harmen; Sleutel, Steven; Meers, Erik

doi:10.3390/agronomy12020456

Cited by 20 publications

(21 citation statements)

References 72 publications

(100 reference statements)

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“…This agrees with the findings of Möller and Müller [27]. Reuland et al [26] found that anaerobic digestates had C sequestration values ranging from 20% to 81% of the total applied organic carbon (C org ) to the land, showcasing their potential to contribute to C build-up in agricultural soils. The carbon use efficiency (CUE) was negatively correlated with the content of dissolved organic carbon (DOC), which is the most available form of C org , present in the anaerobic digestates.…”

Section: Introductionsupporting

confidence: 90%

“…Reuland et al [26] assessed the carbon (C) and N mineralization of several anaerobic digestates upon land application and compared them with the profiles found for other soil organic amendments (i.e., pig slurry, compost, and solid fraction of the digestate). They were able to correlate the extent of C and N mineralization with the physicochemical properties of the organic materials.…”

Section: Introductionmentioning

confidence: 99%

“…This means that the catabolic activities and the release of CO 2 were directly promoted by the greater content of DOC in the anaerobic digestates. Reuland et al [26] concluded that the ratio of DOC to C org and C/N were reliable indicators of the fraction of C that would remain one year after incorporation of the anaerobic digestates to the soil and thus could be used as simple quality parameters to denote the C sequestration potential of digestates prior to their use in the field.…”

Section: Introductionmentioning

confidence: 99%

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Circularity of Bioenergy Residues: Acidification of Anaerobic Digestate Prior to Addition of Wood Ash

et al. 2022

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The present study investigated the acidification treatment of an agrowaste digestate and a food waste digestate, which is necessary before the addition of the wood ashes to attain the pH of zero point of charge in the blend intended to behave as a slow-release fertilizer. The 336-h acidification treatments of the 2.39 ± 0.35 g of digestates were performed with high and low doses of four commercial acids (sulfuric, hydrochloric, nitric, and lactic acids) in 50-mL capped Corning® tubes. For analytical purposes, after the incubation, ultrapure milli-Q® water was added at a rate of 10 mL for each gram of digestate to create a water-soluble phase that allowed the measurement of the pH and the electric conductivity. The results showed that the optimum dose and type of acid were very dependent on the nature of the anaerobic digestate. The maximum buffer capacity of the agrowaste digestate was 0.07 mmol H+-H2SO4/g, but this increased by adding the food waste digestate with a greater content of ammoniacal nitrogen. The agrowaste digestate with a greater content of undigested fiber was more easily oxidized by nitric acid. On the other hand, sulfuric acid oxidized the food waste digestate to a greater extent than the other acids did. Since a high dose of acid was required to achieve a greater efficiency in the solid–liquid separation, which would ease any subsequent handling of the digestates, hydrochloric acid was considered to be the most suitable acid. Lactic acid promoted the growth of filamentous microbes in the agrowaste digestate and microbial colonies in the food waste digestate, which is an indication of the poor preservation of the organic matter under these conditions.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Circularity of Bioenergy Residues: Acidification of Anaerobic Digestate Prior to Addition of Wood Ash

et al. 2022

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“…Raw and liquid digestates from cover crops exhibited a higher C mineralization and a lower N mineralization than the digestate of maize and rye silage (and 14% of chicken manure) reported by Reuland et al (2022), with slightly different incubation conditions. Raw and liquid digestates from cover crops exhibited higher C and N mineralization than other types of digestates studied by Levavasseur et al (2021), who found mean C and N mineralization of 274 mg C g −1 added C and − 18 mg N g −1 added N, respectively.…”

Section: Organic Carbon and Nitrogen Mineralizationmentioning

confidence: 62%

High Nitrogen Availability but Limited Potential Carbon Storage in Anaerobic Digestates from Cover Crops

Levavasseur

Roux²,

Kouakou

et al. 2022

J Soil Sci Plant Nutr

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Cover crops are increasingly used for biogas production, a renewable energy source, without competing for food production. The behavior of the resulting digestates after soil application is poorly understood, which prevents their efficient recycling in agriculture and the environmental assessment of their application. The objective of this study was to quantify the nitrogen availability and potential carbon storage of cover crop-issued digestates after soil application. A total of 10 raw digestates, 2 liquid phases, and 3 solid phases after phase separation were sampled. Main cover crops used in the sampled biogas plants were winter barley, rye, and maize. Classical physicochemical analyses and laboratory incubations to study their C and N mineralization were conducted. Despite a moderate C mineralization of raw and liquid digestates after 91 days, their initial limited carbon content induced, in the end, a low contribution to soil organic carbon (13 and 11 kg remaining C Mg −1 FM, respectively), similar to a pig slurry and much lower than a bovine manure. With a higher initial carbon content and lower C mineralization, the contribution of solid digestates to carbon storage could be higher if applied at a sufficient rate. Organic N mineralization of raw and liquid digestates was moderate, but their N availability was high (3 and 4 kg available N Mg −1 FM, respectively), thanks to their mineral nitrogen contents, similar again to a pig slurry. In contrast, that of solid digestate was almost null with a very low mineral N content and no organic N mineralization. Finally, all the digestates also brought significant amounts of P and K.

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“…This fraction can be treated by AD due to its high biodegradability and moisture content (75-90%), although its rapid degradation could lead to acidification with high production of volatile fatty acids, limiting the anaerobic process (Ganesh et al 2022). Most of the information available for digestate composition and agricultural use refers to anaerobically digested animal manures, corn silage, sewage sludge or biowaste, all with high NH 4 + -N concentrations (Alburquerque et al 2012a;2012b;de la Fuente et al 2013;Häfner, et al 2022;Reuland et al 2022). But, little is known about the digestates produced from the AD of fruit and vegetable wastes.…”

Section: Introductionmentioning

confidence: 99%

Carbon and Nitrogen Mineralisation in Soils and Nutrient Efficiency of Digestates from Fruit and Vegetable Wastes

Álvarez-Alonso

Clemente

Bernal

2022

J Soil Sci Plant Nutr

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A significant amount of fruit and vegetable wastes is generated annually in markets, supermarkets, restaurants and households. Anaerobic digestion allows their appropriate management and helps to complete the cycle of the circular economy as it converts wastes into resources: biogas, a renewable source of energy, and digestate, rich in nutrients of interest for agriculture. The aim of this study was to define the agronomic value of digestate from fruit and vegetable wastes. Two digestates from fruit and vegetable residues were used in incubation experiments for C and N mineralisation in the soil, and in a pot experiment with crops (cardoon and maize), to calculate their fertiliser potential in comparison with a mineral fertiliser. The digestate quickly mineralised in the soil and nitrification processes led to fast formation of NO3−-N. However, increasing the digestate application rate enhanced N-immobilisation and reduced N-mineralisation in the soil. The addition of digestates to the soil resulted in adequate plant growth and nutrient composition, without any negative effects on the plants or soil. However, special attention should be paid to the salt accumulation in the soil for long-term digestate application. The nutrient recovery efficiency indicated that digestate could replace mineral fertiliser completely in cardoon crops and partially (44.5–82.6%) for maize, with an associated economic benefit. The salinity of the digestates limits their quality and their agricultural use to salt-sensitive crops should be limited.

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Assessment of the Carbon and Nitrogen Mineralisation of Digestates Elaborated from Distinct Feedstock Profiles

Cited by 20 publications

References 72 publications

Circularity of Bioenergy Residues: Acidification of Anaerobic Digestate Prior to Addition of Wood Ash

Circularity of Bioenergy Residues: Acidification of Anaerobic Digestate Prior to Addition of Wood Ash

High Nitrogen Availability but Limited Potential Carbon Storage in Anaerobic Digestates from Cover Crops

Carbon and Nitrogen Mineralisation in Soils and Nutrient Efficiency of Digestates from Fruit and Vegetable Wastes

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