Unravelling (maize silage) digestate features throughout a full-scale plant: A spectroscopic and thermal approach

Provenzano, Maria Rosaria; Cavallo, Ornella; Malerba, Anna Daniela; Fabbri, C.; Zaccone, Claudio

doi:10.1016/j.jclepro.2018.05.081

Cited by 29 publications

(11 citation statements)

References 58 publications

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“…Meanwhile, fulvic- and humic-like substances (peak A, peak C, and peak E) were also observed in digestate, indicating the formation of humic-like substances during the AD process. A similar result was observed by Provenzano et al (2018) when studying the EEM contour maps of digestate derived from maize silage. Therefore, in this study, the digestate, to some extent has a certain degree of humification before composting.…”

Section: Resultssupporting

confidence: 85%

“…What’s more, the ratio of tryptophan and fulvic-like fluorescence was used for indicating the OM decomposition and stabilization process. In addition, the EEM contour maps of digestate derived from maize silage was investigated by the same team (Provenzano et al, 2018). However, to the best of our knowledge, there has been no study to investigate the suitability of assessing stabilization of OM during digestate composting using EEM combined with PARAFAC analysis.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of digestate composting stability using fluorescence EEM spectroscopy combining with PARAFAC

2019

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A laboratory scale experiment of digestate composting was carried out using a reactor system. In this study, conventional physicochemical and biological analyses were carried out and fluorescence excitation-emission matrix (EEM) spectroscopy combined with parallel factor analysis (PARAFAC) was used to assess the maturity and stability during digestate composting. A four-component model was obtained and three components, i.e. fulvic-like (C1 and C3), protein-like (C2), and humic-like (C4) components, were identified. Furthermore, the ratios of each two components were calculated and the relationships with other parameters were established using Pearson correlation analysis. The results showed that the main humification process during digestate composting was the accumulation of fulvic-like substances and that secondary formation occurred at the late stage of digestate composting. Moreover, the EEM–PARAFAC technique could be used as a sensitive and efficient tool for assessing the dynamic changes of digestate composting. The ratio C4/(C1 + C3) is the most suitable indicator in evaluating the stability of digestate composting.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Characterization of digestate composting stability using fluorescence EEM spectroscopy combining with PARAFAC

2019

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“…The second peak, between 220-380 o C is attributed to the easily oxidizable compounds (e.g. cellulosic material and aliphatic structures) [14]. The third step, between 400-600 o C, is due to the thermal degradation of recalcitrant, aromatic structures including lignin and non-hydrolyzable compounds [15].…”

Section: Biogas Productionmentioning

confidence: 99%

“…A significant amount of mass remained was glass waste. DSC profile was characterized by two exothermic peaks, one in the range 200-320 o C corresponding to the degradation of the easily biodegradable fraction (carbohydrates, dehydration of aliphatic structures and decarbolixation of cellulose) [14] and the beginning of degradation of plastics. The second exothermic peak around 400-580 o C, was associated with the degradation of aromatic structures from organic polymers.…”

Section: Biogas Productionmentioning

confidence: 99%

Biogas production from agricultural and municipal waste

et al. 2019

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The article presents the results of biogas production from municipal and agricultural waste. The mesophilic digestion of feedstocks was evaluated. Fermentation process was performed according to the DIN 38414-S8. Five types of agricultural waste were used for the research: 100% maize silage, 25% apple pomace – 75% maize silage, 50% apple pomace – 50% maize silage, 75% apple pomace – 25% maize silage and under – size fraction of municipal waste from the sorting drum. Fermentation of waste was carried out for 30 days. In the produced biogas, there were measured the content of: CH4, CO2, O2 and the total yield of biogas. The combination of different groups of waste in the fermentation process causes a higher efficiency of biogas production. Additionally thermal analysis (TG, DSC) of biogas digestate were conducted. Due to the impurities present in the biogas digestate derived from municipal waste, it becomes impossible to use it as fertilizer in agriculture.

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“…Digestate management strategies are planned not only for safe disposal but also to increase value and marketability (Logan and Visvanathan, 2019). So, before storage, transport and distribution, digestate is very often mechanically or physically separated into two fractions: a solid palatable fraction and a clarified liquid one (Provenzano et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of digestate spreading machines in vineyards and citrus orchards: preliminary trials

Manetto

Cerruto

Rita

et al. 2020

Heliyon

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This research was carried out to evaluate a local biogas plant's solid fraction digestate spreading in a citrus orchard and vineyard. Three spreaders were tested: a broadcast manure spreader in the citrus orchard, and two cylindrical-shaped spreaders in the vineyard; the first one working in broadcast configuration, the second one in localised configuration. Experimental tests assessed effective work time, mean work speed, digestate flow rate and longitudinal and transverse spreading uniformity. In the citrus orchard, the digestate was mainly spread in the centre of the inter-row (around 66%), with low variability between inter-rows (coefficient of variation (CV) equal to 2.7%) and much higher variability within inter-rows (CV ¼ 31.4%). The effective work time was about 28% of total field time and real work capacity was about 0.96 ha h À1 . In the vineyard, broadcast spreading released more on the right compared to the left (ratio 1.74) due to distributor disc rotation, whereas localised spreading was more uniform. Overall, variability between inter-rows had CV ¼ 15.1% and within inter-rows CV ¼ 33.3%. Real work capacity was about 0.16 ha h À1 for broadcast spreading and 0.26 ha h À1 for localised spreading. A preliminary economic evaluation, based on sub-contractor tariffs, produced the mean tariff for transaction and spreading costs of digestate in farms near the biogas plant.

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Unravelling (maize silage) digestate features throughout a full-scale plant: A spectroscopic and thermal approach

Cited by 29 publications

References 58 publications

Characterization of digestate composting stability using fluorescence EEM spectroscopy combining with PARAFAC

Characterization of digestate composting stability using fluorescence EEM spectroscopy combining with PARAFAC

Biogas production from agricultural and municipal waste

Performance evaluation of digestate spreading machines in vineyards and citrus orchards: preliminary trials

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