Influence of Origin and Post-treatment on Greenhouse Gas Emissions After Anaerobic Digestate Application to Soil

Askri, Amira; Laville, Patricia; Trémier, Anne; Houot, Sabine

doi:10.1007/s12649-015-9452-6

Cited by 26 publications

(21 citation statements)

References 36 publications

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“…This generates a dry-matter-rich solid fraction with a high proportion of the initial phosphorus and a liquid fraction with a high share of nitrogen and potassium [11,12]. In addition to water reduction and improved transportability, processing of digestates might have the potential to reduce climate-relevant N 2 O emissions via partial separation of N and organic matter [13][14][15]. When considering solid and liquid after separation, varying experimental results were reported.…”

Section: Introductionmentioning

confidence: 99%

“…When considering solid and liquid after separation, varying experimental results were reported. Whether the solid or liquid leads to higher emissions after soil application is highly dependent on the digestate feedstock and pretreatment procedure [13,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies (e.g., [13,[16][17][18][19][20][21][22][23][24]) mainly focused on the effect of feedstocks in combination with management practices. However, no evaluation of the single steps within an entire processing chain could be found.…”

Section: Introductionmentioning

confidence: 99%

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Organic Matter Composition of Digestates Has a Stronger Influence on N2O Emissions than the Supply of Ammoniacal Nitrogen

2021

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Manures can be treated by solid–liquid separation and more sophisticated, subsequent approaches. These processes generate fertilizers, which may differ in composition and N2O release potential. The aim of the study was to investigate the influence of processing-related changes in digestate composition on soil-derived N2O emissions after application to soil. For that purpose, N2O emissions within the first 7 weeks after fertilization with two raw and eight processed digestates (derived from solid–liquid separation, drying and pelletizing of separated solid, and vacuum evaporation of separated liquid) were measured in the field in 2015 and 2016. Additionally, an incubation experiment was run for 51 days to further investigate the effect of subsequent solid and liquid processing on soil-derived N2O release. The results showed that, only in 2016, the separation of digestate into solid and liquid fractions led to a decrease in N2O emissions in the following order: raw digestate > separated liquid > separated solid. N removal during subsequent processing of separated solid and liquid did not significantly influence the N2O emissions after fertilization. In contrast, the concentrated application of the final products led to contradictory results. Within the solid processing chain, utilization of pellets considerably increased the N2O emissions by factors of 2.7 (field, 2015), 3.5 (field, 2016), and 7.3 (incubation) compared to separated solid. Fertilization with N-rich ammonium sulfate solution led to the lowest emissions within the liquid processing chain. It can be concluded that the input of less recalcitrant organic C into the soil plays a greater role in N2O release after fertilization than the input of ammoniacal N. Digestate processing did not generally reduce emissions but apparently has the potential to mitigate N2O emissions substantially if managed properly.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Organic Matter Composition of Digestates Has a Stronger Influence on N2O Emissions than the Supply of Ammoniacal Nitrogen

2021

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“…Askri et al . (2016) and Sherlock et al . (2002) had previously reported the initial peak in N 2 O emission occurred during a period of active nitrification.…”

Section: Discussionmentioning

confidence: 96%

Greenhouse gas emissions in agricultural cultivated soils using animal waste-based digestates for crop fertilization

et al. 2021

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Agricultural waste contributes significantly to greenhouse gas (GHG) emissions if not adequately recycled and sustainably managed. A recurring agricultural waste is livestock waste that has consistently served as feedstock for biogas systems. The objective of this study was to assess the use of animal waste digestate to mitigate GHG emissions in agricultural fields. Wheat (Triticum spp. L.) was fertilized with different types of animal waste digestate (organic fertilizers) and synthetic nitrogen fertilizer (inorganic fertilizer). The 170 kg N/ha presented in digestates were split fertilized at an application rate of 90 and 80 kg N/ha. Emissions of GHGs (carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O)) were monitored directly by a static chamber system. The soil and environmental variables were measured to determine their influence on GHG emissions. Emission peaks in N2O and CO2 after the first application of fertilizers with the emissions flattening out over the cultivating season while CH4 emission was negligible with no apparent patterns observed. Results showed individual and cumulative emissions of CO2, CH4 and N2O from the digestates were relatively low and digestate fertilization could be an efficient method for reducing GHGs from agricultural sources in temperate climate conditions.

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“…Exposure to NH 3 is a health hazard and in the atmosphere a pollutant (Naseem and King 2018). However, some N is lost while composting through volatilization of ammonia (NH 3 ) in aerobic composting facilities (Steiner et al 2010;Tuomela et al 2000;Askri et al 2016). Our earlier studies on the co-composting cocoa pod with animal manures and mineral fertilizer additives indicated potential emission of NH 3 during composting (Fidelis and Rajashekhar Rao 2017).…”

Section: Introductionmentioning

confidence: 99%

The role of chemical amendments on modulating ammonia loss and quality parameters of co-composts from waste cocoa pods

Vitinaqailevu

Rao

2019

Int J Recycl Org Waste Agricult

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Purpose Nitrogen loss as ammonia (NH 3) in a waste cocoa pod co-composting process was determined following the addition of three potential chemical amendments that could lower NH 3 loss. Further, amended compost products were assessed for quality and possible phytotoxicity in a pot experiment. Methods Pod borer damaged cocoa pods were co-composted in lab-scale vessels under ambient conditions with double superphosphate, phosphoric acid, and gypsum at 2%, 5% and 1% of fresh weight, respectively. NH 3 emitted during composting was trapped in standard H 2 SO 4 and determined titrimetrically. Composting mixtures were sampled on days 0, 7, 56 and 90 to monitor pH, total C, total N, and C:N ratio. Mature co-composts were incorporated to the soil at 20 t ha −1 and growth response of Chinese cabbage plants (Brassica rapa chinensis) assessed for the phytotoxicity. Results The chemical amendments were ineffective (p > 0.05) in preventing loss of NH 3 but the quality of composting mixtures were significantly (p < 0.0001) improved. The manure compost generated had acceptable parameters (C, 31.2-31.9% and C:N ratio, 9-10:1) and were free from phytotoxicity for soil application as revealed by the response of Chinese cabbage crop. Conclusions Chemical amendments used in the co-composting process mainly modulated pH without any detrimental effects on quality. The results also demonstrated that the NH 3 loss is insignificant from the cocoa waste-composting process. Further studies are required with increased rates of acidifying amendments like phosphoric acid to further augment the quality of cocoa pod composts.

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Influence of Origin and Post-treatment on Greenhouse Gas Emissions After Anaerobic Digestate Application to Soil

Cited by 26 publications

References 36 publications

Organic Matter Composition of Digestates Has a Stronger Influence on N2O Emissions than the Supply of Ammoniacal Nitrogen

Organic Matter Composition of Digestates Has a Stronger Influence on N2O Emissions than the Supply of Ammoniacal Nitrogen

Greenhouse gas emissions in agricultural cultivated soils using animal waste-based digestates for crop fertilization

The role of chemical amendments on modulating ammonia loss and quality parameters of co-composts from waste cocoa pods

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