Valorization of digestates from urban or centralized biogas plants: a critical review

Guilayn, Felipe; Rouez, Maxime; Crest, Marion; Patureau, Dominique; Jimenez, Julie

doi:10.1007/s11157-020-09531-3

Cited by 70 publications

(46 citation statements)

References 222 publications

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“…For example, comparing food wastes and maize silage, food wastes are already processed goods with a high degradability and high protein content. Thereby, food waste-based digestates tend to have a higher OM degradability and a higher share of NH + 4 -N than maize silage, that could enhance soil microbial activity (Möller and Müller, 2012;Guilayn et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Field Application of Organic Fertilizers Triggers N2O Emissions From the Soil N Pool as Indicated by 15N-Labeled Digestates

Häfner

Ruser

Claß-Mahler

et al. 2021

Front. Sustain. Food Syst.

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Anaerobic digestion (AD) can generate biogas while simultaneously producing digestate which can be used as fertilizer. Feedstocks used for AD influence digestate composition, which in turn may affect carbon (C) and nitrogen (N) turn-over in soils and subsequently influence nitrous oxide (N2O) emissions after soil application. Assessment of greenhouse gas emissions from digestates can help to evaluate the overall sustainability of an agricultural production system. The objective of this study was therefore to evaluate and understand the effect of differences in digestate composition on in situ N2O emissions within the 1st weeks after application of seven digestates. The digestates were derived from different feedstocks and 15N-labeled, either in total N or only in ammonium-N. Therefore, the experimental design enabled us to differentiate between potential N2O-N sources (i.e., digestate N or soil N). Furthermore, it allowed to distinguish to some extent between organic-N and ammonium-N as potential N sources for denitrification. Digestates were homogeneously incorporated into the upper 5 cm of microplots in an arable Haplic Luvisol in South Germany at a rate of 170 kg N ha−1. After application, N2O fluxes were measured for ~60 days (May-July) using the closed chamber method in 2 experimental years. Mainly due to higher precipitations in the 1st year, cumulative N2O emissions were higher (312–1,580 g N2O-N ha−1) compared to the emissions (133–690 g N2O-N ha−1) in the 2nd year. Between 16–33% (1st year) and 17–38% (2nd year) of N2O emissions originated from digestate N, indicating that digestate application triggered N2O production and release mainly from soil N. This effect was strongest immediately after digestate application. It was concluded that the first (short term) peak in N2O emissions after digestate application is largely related to denitrification of soil-N. However, the experimental setup does not allow to differentiate between the different denitrification pathways. Weather conditions showed a substantial effect on N2O emissions, where the correlation between N2O and CO2 flux rates hinted on denitrification as main N2O source. The effect of digestate composition, particularly organic N from the digestate, on soil N2O emissions seems to be of minor relevance.

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Section: Introductionmentioning

confidence: 99%

Field Application of Organic Fertilizers Triggers N2O Emissions From the Soil N Pool as Indicated by 15N-Labeled Digestates

Häfner

Ruser

Claß-Mahler

et al. 2021

Front. Sustain. Food Syst.

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“…smart recycle bin (Yeo et al, 2019), under-the-sink FLW disposal connecting to the sewer system (Cecchi and Cavinato, 2019), pipeline transmission (Muradin et al, 2018) -Technology: further R&D into optimal feedstock, and optimal process design and conditions is needed to cope with the low-yield issue and maximise output of targeted products (Elkhalifa et al, 2019) -Supply: supply locations are geographically dispersed (Kokossis and Koutinas, 2012); FLW feedstock bears regional and seasonal traits (Caruso et al, 2019); source segregation is required (Cecchi and Cavinato, 2019). -Market: the demand for fertilisers always exceeds supply (Chojnacka et al, 2020); consumer preferences towards foods produced from the upcycled and ecofriendly materials enhance the intrinsic value of digestate used as recycled fertilisers/ compost (Guilayn et al, 2020) -Technology: this technology has a small production scale compared to fossil-based fertiliser production (Chojnacka et al, 2020), encounters difficulty in planning and use, causes unpleasant odour for neighbourhood (Case et al, 2017); there is limited knowledge regarding vermicomposting (Choudhary and Suri, 2018).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…-Logistics: high collection and handling costs (Sakarika et al, 2019) -Policy: the legal status of digestate that varies in different countries hinders its use (Stiles et al, 2018;Beggio et al, 2019;Chojnacka et al, 2020); and no specific quality control and criteria available for using digestates as fertilisers (Guilayn et al, 2020).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

A systematic review of research on food loss and waste prevention and management for the circular economy

Ramudhin

Colicchia

et al. 2021

International Journal of Production Economics

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Currently, new technologies for processing liquid fractions of digestates are still being explored [17]. One of the possibilities is through nutrient recovery such as struvite (STR) precipitation [18] and ammonia stripping (to produce ammonium sulphate (AS)) [6,[19][20][21], combined ozone treatment and ultrafiltration [22], combined system with aerobic granular sludge batch reactors and ultrafiltration [23], or utilizing fly ash as a chemical precipitant [24].…”

Section: Introductionmentioning

confidence: 99%

“…The appropriate post-treatments for either solid fractions or liquid fractions of digestates are very crucial for any future biogas plant that integrates part of the circular bioeconomy [17,29,30]. The aim of the circular economy is to influence material and energy flows in order to maximize environmental benefits whilst avoiding costs (grow-makese-restore) [31]; which is currently one of the main priorities of the European Union as described in detail by Molina-Moreno et al [32], Muradin et al [33] and Vilardi et al [34].…”

Section: Introductionmentioning

confidence: 99%

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

et al. 2021

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Fast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to study the variability of the remaining compounds in the digestate liquid fractions in relation to substrate origin, process parameters and solid–liquid separation techniques. Twenty-nine digestates from full-scale codigestion biogas plants and one waste activated sludge (WAS) digestate were collected and characterized. This study highlighted the combined effect of the solid–liquid separation process and the anaerobic digestion feedstock on the characteristics of liquid fractions of digestates. Two major clusters were found: (1) liquid fractions from high efficiency separation process equipment (e.g., centrifuge and others with addition of coagulant, flocculent or polymer) and (2) liquid fractions from low efficiency separation processes (e.g., screw press, vibrating screen and rotary drum), in this latter case, the concentration of chemical oxygen demand (COD) was associated with the proportion of cow manure and energy crops at biogas plant input. Finally, SUVA254, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT).

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Valorization of digestates from urban or centralized biogas plants: a critical review

Cited by 70 publications

References 222 publications

Field Application of Organic Fertilizers Triggers N2O Emissions From the Soil N Pool as Indicated by 15N-Labeled Digestates

Field Application of Organic Fertilizers Triggers N2O Emissions From the Soil N Pool as Indicated by 15N-Labeled Digestates

A systematic review of research on food loss and waste prevention and management for the circular economy

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

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