Comparison of various post-treatments for recovering methane from agricultural digestate

Sambusiti, Cécilia; Monlau, Florian; Ficara, Elena; Musatti, Alida; Rollini, Manuela; Barakat, Abdellatif; Malpei, Francesca

doi:10.1016/j.fuproc.2015.04.028

Cited by 74 publications

(51 citation statements)

References 35 publications

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“…After ten minutes of ball-milling, a higher methane potential (321 NmL CH 4 kg -1 VS) than that of raw solid digestate (117 NmL CH 4 kg -1 VS), was obtained 72 . Mild thermal post-treatment (80 °C, 1-3 h) did not affect the methane potential of digestate 36,79 whereas thermal posttreatment at higher temperature (120 °C, 30 min) had contrasted effect in enhancing the methane potential of only two digestates out of the three investigated 80 82 . In this case, the control reactor was fed with a mixture of grass silage and cow manure (0.43:1 w/w, % VS) at an OLR of 2 kg VS m -3 day -1 and an HRT of 20 days.…”

Section: Digestate Conversion Into Energymentioning

confidence: 80%

“…Interestingly, still high amount of carbohydrates fibers (i.e. cellulose and hemicelluloses) were detected in the solid-separated digestate 35,36 . Nowadays, there are emerging valorisation routes for the utilization of digestate apart from the classical farmland application as fertilizer or soil amendment 37 .…”

Section: Agricultural Digestate Compositionmentioning

confidence: 98%

“…Name., 2012, 00, 1-3This journal is © The Royal Society of Chemistry 2012 NaOH) did not enhance the methane potential of digestate 36, 79 whereas aqueous ammonia soaking (22 °C, 3 days, 32 % w/w ammonia) resulted with an increase in 45 % of the methane potential81 . Finally, found that enzymatic post-treatment enhanced methane production by 13 % and 51 % for solid separated-digestate and whole digestate, respectively36 . So far, few studies have focussed on the effect of digestate posttreatment at the scale of a continuous reactor 78,82.…”

mentioning

confidence: 93%

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New opportunities for agricultural digestate valorization: current situation and perspectives

Monlau

Sambusiti

Ficara

et al. 2015

Energy Environ. Sci.

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407

192

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Section: Digestate Conversion Into Energymentioning

confidence: 80%

Section: Agricultural Digestate Compositionmentioning

confidence: 98%

mentioning

confidence: 93%

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New opportunities for agricultural digestate valorization: current situation and perspectives

Monlau

Sambusiti

Ficara

et al. 2015

Energy Environ. Sci.

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407

192

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“…Recently, the Italian legislation have involved a restriction in the agricultural use of digestate derived from AD of different materials and/or residues. Moreover, digestate, produced throughout the year, has to be stored, as it cannot be used directly on agricultural lands, due to limitations imposed by its stabilization level, crop growth stage and soil type . In many case, the spreading activities are incompatible with the requirements of environmental protection imposed by the European Nitrates Directive (91/676/EEC) .…”

Section: Introductionmentioning

confidence: 99%

“…Generally, at farm scale, digestate is mechanically separated into liquid and solid fractions that are stored and handled separately . The liquid fraction is rich in nitrogen (N) and potassium (K), whereas the solid fraction retains great amount of phosphorous (P) and organic matter (mainly fibres).…”

Section: Introductionmentioning

confidence: 99%

Synergy between anaerobic digestion and a post‐treatment based on Thermophilic Aerobic Membrane Reactor (TAMR)

Collivignarelli

Bertanza

Abbà

et al. 2017

Env Prog and Sustain Energy

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Wet Oxidation (WO) of sewage sludge is a chemical\ud oxidation of sludge at high temperatures and pressures by\ud means of an oxygen-containing gas. The liquid stream originated\ud byWO is easily biodegradable, and therefore, the recirculation\ud to the biological Waste Water Treatment Plant\ud (WWTP) may be a feasible solution. However, the WO effluent\ud has a residual organic and nitrogen content so that its\ud treatment may be required when the receiving WWTP has\ud no surplus treatment capacity left. The aim of this research\ud was the assessment of the anaerobic treatability of the WO\ud liquid residue, in order to reduce the organic load to be\ud recirculated to the WWTP, simultaneously promoting energy\ud recovery. For this purpose, the liquid residue obtained during\ud full scale WO tests on two different types of sludge was\ud submitted to anaerobic digestion in a continuous flow pilot\ud reactor (V=5 L). Furthermore, batch tests were carried out in\ud order to evaluate possible inhibition factors. Experimental\ud results showed that, after the start-up/acclimation period\ud (~130 days), Chemical Oxygen Demand (COD) removal\ud efficiency was stably around 60% for about 120 days, despite\ud the change in operating conditions. In the last phase of the\ud experimental activity, COD removal reached 70 % under the\ud following treatment conditions: Hydraulic Retention Time\ud (HRT)=20 days, Volumetric Organic Loading Rate\ud (VOLR)=0.868 kg COD/m3/day, Organic Loading Rate per\ud Volatile Suspended Solids (OLRvss)=0.078 kg COD/kg VSS/\ud day, temperature (T)=36.5 °C, pH=8. Energy balance calculation\ud demonstrated anaerobic treatment sustainability

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Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Peyrelasse

Kaparaju

Lallement³

et al. 2021

Biofuels Bioprod Bioref

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In this study, the effect of thermo‐alkaline pretreatment and recycling of the liquid fraction (black liquor) for successive pretreatment steps on chemical composition and methane yields from horse manure was investigated. At first, horse manure was subjected to alkaline pretreatment at 70 °C for 1 h (8.6 g NaOH/100 g total solids). Pretreated biomass was then separated into solid and liquid fractions (black liquor). In the subsequent stages, black liquor was mixed with 20% (v/v) of fresh NaOH and was reused to pretreat subsequent batches of horse manure (cycles 1–4). Chemical analyses showed that thermo‐alkaline pretreatment was effective in the delignification and solubilization of organic matter and thereby increased the holocellulose (cellulose and hemicelluloses) content in the solid fraction of horse manure. On comparison with untreated horse manure methane yields (225 ± 1 L CH4 kg−1 VSadded), thermo‐alkaline pretreatment improved the methane yields of horse manure by 39% (313 ± 16 L CH4 kg−1 VSadded). However, the effectiveness of black liquor recycling on methane production decreased (from 39 to 12%) with an increase in the number of recycling steps (from 1 to 4). Nevertheless, recycling of black liquor reduced the consumption of NaOH (40%) and water use (60%). Thus, thermo‐alkaline pretreatment with liquor recycling was found to be an effective pretreatment with an economic gain of 2.4 to 10.4 compared to pretreatment without recycling. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

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Comparison of various post-treatments for recovering methane from agricultural digestate

Cited by 74 publications

References 35 publications

New opportunities for agricultural digestate valorization: current situation and perspectives

New opportunities for agricultural digestate valorization: current situation and perspectives

Synergy between anaerobic digestion and a post‐treatment based on Thermophilic Aerobic Membrane Reactor (TAMR)

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

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