The methane yield of digestate: Effect of organic loading rate, hydraulic retention time, and plant feeding

Menardo, S.; Gioelli, F.; Balsari, P.

doi:10.1016/j.biortech.2010.10.094

Cited by 95 publications

(63 citation statements)

References 17 publications

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“…Typically during the first 2 months of digestate storage post-methanation, up to 15% additional CH 4 238 yields have been reported (Balsari et al, 2013;Menardo et al, 2011;Weiland, 2010). However, digestate 239 storage during post-methanation also have collateral influence on NH 3 emissions, owing to high 240 ammonium nitrogen (NH 4 -N) concentration (Whelan et al, 2010).…”

Section: Post-methanated Digestate 237mentioning

confidence: 99%

“…Digestate quality is further affected by maturing in storage tanks 23 (Menardo et al, 2011). Rigid compliance criteria for Class I digestate have been set by the European 24 Commission (EC) and the British Standard Institution (BSI) (BSI, 2010;EC, 2014).…”

mentioning

confidence: 99%

“…During AD, the majority of organic (slow release) nitrogen is transformed into readily available nitrogen 35 (RAN) (Defra, 2011), specifically for protein-rich feedstocks, including the organic fraction of the 36 municipal solid waste (OFMSW) 1 , dairy by-products and slaughterhouse waste (Kryvoruchko et al, 37 2009;Menardo et al, 2011). Typical total-N content of food-based digestate ranges between 5-8 kg m -3 , 38 with about 60-80% of this present as RAN; the proportion of RAN to total-N in food-based digestate is 39 nearly 40% higher than manure-based digestate (202 kg and 145 kg respectively for every 250 kg total-N) 40 (WRAP, 2011).…”

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confidence: 99%

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Assessment and mitigation of the environmental burdens to air from land applied food-based digestate

Tiwary

Williams

Pant

et al. 2015

Environmental Pollution

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Highlights:· In situ air pollution assessment of land applied digestate is performed. · Environmental burden minimisation scenarios for digestate bio fertiliser presented. · Food-based digestate show high ammonia volatilisation potential. · Soil incorporated digestate effectively reduces NH 3 but elevates N 2 O emissions. · Managing digestate emissions mitigate both climate change and air pollution. Abstract (limit 150 words only)Anaerobic digestion (AD) of putrescible urban waste for energy recovery has seen rapid growth over recent years. In order to ascertain its systems scale sustainability, however, determination of the environmental fate of the large volume of digestate generated during the process is indispensable. This paper evaluates the environmental burdens to air associated with land applied food-based digestate in terms of primary pollutants (ammonia, nitrogen dioxide) and greenhouse gases (methane and nitrous oxide). The assessments have been made in two stages -first, the emissions from surface application of food-based digestate are quantified for the business as usual (BAU). In the next step, environmental burden minimisation potentials for the following three mitigation measures are estimated -mixed waste digestate (MWD), soil-incorporated digestate (SID), and post-methanated digestate (PMD). Overall, the mitigation scenarios demonstrated considerable NH 3 , CH 4 and N 2 O burden minimisation potentials, with positive implications for both climate change and urban pollution. Keywords: anaerobic digestion; bio fertilizer; digestate; environmental burdens; OFMSWCapsule abstract: In situ monitoring and analyses demonstrate the role of post-processing in greenhouse gases and air pollution mitigation from food-based digestate use as bio fertiliser. Highlights:· In situ air pollution assessment of land applied digestate is performed. · Environmental burden minimisation scenarios for digestate bio fertiliser presented. · Food-based digestate show high ammonia volatilisation potential. · Soil incorporated digestate effectively reduces NH 3 but elevates N 2 O emissions. · Managing digestate emissions mitigate both climate change and air pollution.3

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Section: Post-methanated Digestate 237mentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Assessment and mitigation of the environmental burdens to air from land applied food-based digestate

Tiwary

Williams

Pant

et al. 2015

Environmental Pollution

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“…The measures of DM, total N content, and co-digestate pH used in this study (Table 1) approximated those of the co-digestate produced from pig slurry in the study by Menardo et al (2011) [17]. Alternatively, the values determined for P, K, and metals (Cu and Zn) of the co-digestate in this study (Table 1) were lower than those found for pig slurry AD digestate alone in the Marcato et al (2009a) study [2].…”

Section: Chemical Characteristics Of Co-digestate (Input Material)mentioning

confidence: 91%

Centrifugation of Digestate: The Effect of Chitosan on Separation Efficiency

et al. 2017

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Mechanical separation of co-digestate removes dry matter (DM) and phosphorous (P) from digestate effectively but is less capable at removing nitrogen (N) and potash (K). Adding flocculants can enhance separator efficiency. However, information on the use of chitosan as flocculant for co-digestate and its effects on amended slurry application to soil is scarce. This study undertook a series of trial and error tests to identify the optimal chitosan dose to be applied to co-digestate. Four chitosan doses were evaluated: 120 (Dose 1), 240 (Dose 2), 360 (Dose 3), and 480 (Dose 4) mL L −1 of co-digestate. After optimal dose application, centrifugation was employed to separate the co-digestate (centrifugation tests). We used simple separation indices to evaluate the effectiveness of chitosan addition prior to centrifuge usage. Dose optimization tests results indicated that incremental doses of chitosan had no effect (p > 0.05) on total N and it decreased (p < 0.05) total P removal to solids. Dose 3 showed a superior effect based on the physical characteristics evaluated and on the DM content of the fractions produced. Centrifugation tests results showed chitosan increased (p < 0.05) centrifugation efficiency for K, copper (Cu), and zinc (Zn) (75, 36, and 51%, respectively) and had no effect on total N or P. The major findings show that the use of natural and relatively cheap polymer chitosan improves the efficacy of co-digestate centrifugation with respect to K, Cu, and Zn, lowering their load to arable land once a solid fraction is applied.

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“…Despite its potential as fertilizer, the digestate still contains undigested solids, which can be either used to recover additional methane [138] or to produce ethanol [139]. The use of digestate as bioethanol production substrate appears a suitable strategy to handle the anaerobic residues properly as well as to provide a competitive supply of biomass for biofuel production.…”

Section: The Use Of Digestate For Bioethanol Productionmentioning

confidence: 99%

Combined Biogas and Bioethanol Production: Opportunities and Challenges for Industrial Application

Cesaro

Belgıorno

2015

Energies

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Abstract:In the last decades the increasing energy requirements along with the need to face the consequences of climate change have driven the search for renewable energy sources, in order to replace as much as possible the use of fossil fuels. In this context biomass has generated great interest as it can be converted into energy via several routes, including fermentation and anaerobic digestion. The former is the most common option to produce ethanol, which has been recognized as one of the leading candidates to substitute a large fraction of the liquid fuels produced from oil. As the economic competitiveness of bioethanol fermentation processes has to be enhanced in order to promote its wider implementation, the most recent trends are directed towards the use of fermentation by-products within anaerobic digestion. The integration of both fermentation and anaerobic digestion, in a biorefinery concept, would allow the production of ethanol along with that of biogas, which can be used to produce heat and electricity, thus improving the overall energy balance. This work aims at reviewing the main studies on the combination of both bioethanol and biogas production processes, in order to highlight the strength and weakness of the integrated treatment for industrial application.

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The methane yield of digestate: Effect of organic loading rate, hydraulic retention time, and plant feeding

Cited by 95 publications

References 17 publications

Assessment and mitigation of the environmental burdens to air from land applied food-based digestate

Assessment and mitigation of the environmental burdens to air from land applied food-based digestate

Centrifugation of Digestate: The Effect of Chitosan on Separation Efficiency

Combined Biogas and Bioethanol Production: Opportunities and Challenges for Industrial Application

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