Investigation of effect of particle size and rumen fluid addition on specific methane yields of high lignocellulose grass silage

Wall, David; Straccialini, Barbara; Allen, Eoin; Nolan, P.; Herrmann, Christiane; O’Kiely, P.; Murphy, Jerry D.

doi:10.1016/j.biortech.2015.05.078

Cited by 39 publications

(21 citation statements)

References 28 publications

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“…The TS, VS and SMY of grass silage were assumed to be 230 g kg −1 , 920 g kg −1 TS and 358 L CH 4 kg −1 VS, respectively. These values are within the range for perennial ryegrass silages reported in Ireland . The methane proportion (CH 4 %; vol.…”

Section: Methodssupporting

confidence: 80%

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Impacts of characteristics of grass silage and cattle slurry feedstocks on the cost of methane production

Himanshu

Murphy

Lenehan

et al. 2018

Biofuels Bioprod Bioref

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Feedstocks characteristics and their provision cost can have a significant impact on the cost of methane production in an anaerobic digestion (AD) facility. This study investigated the impacts of changing grass silage characteristics, grass silage and cattle slurry provision costs and their binary mixing ratios on the cost of methane production from an on‐farm AD facility. The feedstock provision cost contributed about half of the total cost of methane production when the AD facility solely operated on grass silage. The total cost of methane production from mono‐digestion of cattle slurry, compared to grass silage, was 87% higher when it was supplied free of cost and was 42% higher when a gate fee of €70 t−1 total solids was charged. For co‐digestion of grass silage and cattle slurry, the total cost of methane production progressively increased as the proportion of slurry in the co‐digested feedstocks mixture increased. Antagonistic and synergistic methanogenesis resulted in a corresponding 6% higher and 5% lower total cost of methane production during co‐digestion, at silage:slurry volatile solids ratio of 0.8:0.2, compared to the binary mixture without these effects. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Methodssupporting

confidence: 80%

“…The low and high SMY for silage were assumed to be 300 and 400 L CH 4 kg −1 VS, respectively, while for slurry these values were assumed to be 120 and 240 L CH 4 kg −1 VS, respectively (Table ). These SMYs were approximately the highest and lowest values reported in Ireland …”

Section: Methodsmentioning

confidence: 68%

Impacts of characteristics of grass silage and cattle slurry feedstocks on the cost of methane production

Himanshu

Murphy

Lenehan

et al. 2018

Biofuels Bioprod Bioref

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“…Literature reporting the influence of particle size reduction for grass silage is limited, however, it is suggested that shorter particle sizes can stimulate hydrolysis by increasing the surface area with which the microorganisms can access [9,10]. A previous study by the authors in singlephase digestion illustrated that reduction in particle size to <1 cm allowed for digestion of low DSD grass silage in a CSTR, at a loading rate of 2.5 kg VS m À3 d À1 , when coupled with rumen fluid addition at a rate of 50 mL per kg silage [3]. CSTRs fed with grass silage of longer particle size (>3 cm), proved extremely difficult to operate due to mechanical difficulties, irrespective of rumen fluid addition.…”

Section: Effect Of Particle Size and Rumen Fluid Addition In Grass Simentioning

confidence: 96%

“…If the COD destruction rate is 84% (Section 3.2.3), then the SMY may be evaluated at 230 L CH 4 kg À1 VS. This can be compared with a SMY of 340 L CH 4 kg À1 VS for the same grass silage in a single-phase system [3]. It is of interest that in single phase digestion the <1 cm grass silage with rumen fluid gave the best result (Wall et al, 2015) whilst in two phase digestion the >3 cm grass silage was optimal.…”

Section: Potential Methane Productionmentioning

confidence: 97%

“…Alternatively liquor separated from the digestate may be recirculated to the reactor, maintaining the DS content at a required level, typically less than 100 g kg À1 [2]. A previous study has shown that monodigestion of low dry solids digestibility (DSD) silage, at greater than 3 cm particle size (>3 cm), caused significant operational problems in one-phase digestion [3]. Even at shorter particle sizes, of less than 1 cm (<1 cm), mono-digestion of the same grass silage failed without continuous addition of a rumen fluid supplement.…”

Section: Single-phase Digestion Of Lignocellulosic Grass Silagementioning

confidence: 99%

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Investigating two-phase digestion of grass silage for demand-driven biogas applications: Effect of particle size and rumen fluid addition

et al. 2016

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a b s t r a c tHigh lignocellulose content grass silage was investigated for two-phase digestion (leaching followed by upflow anaerobic sludge blanket (UASB)) for application to demand-driven biogas production. Leaching trials were undertaken investigating the effects of particle size reduction and rumen fluid addition on the hydrolysis and acidogenesis phases. Reducing grass silage particle size to <1 cm was not suited to leaching as particles could not be fully entrained in the system; this was not an issue at >3 cm particle size. Rumen fluid addition increased production of volatile fatty acids (VFA) but reduced pH levels, which subsequently hindered hydrolysis of volatile solids (VS). When electricity demand is low, it is recommended to operate in leach only mode with grass silage particle size >3 cm and with rumen fluid addition; this limits VS destruction to 30% while maintaining a high VFA yield. When electricity demand is high, connection of the UASB generates 61% destruction of VS maximising biogas production. Operation of the SLBR-UASB achieves lower specific methane yields than traditional single-stage digestion but may offer advantages in demand driven biogas systems.

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Bioaugmentation of anaerobic digesters treating lignocellulosic feedstock by enriched microbial consortia

Özbayram

Kleinsteuber

Nikolausz

et al. 2018

Engineering in Life Sciences

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Three different bioaugmentation cultures enriched from natural and engineered cellulolytic environments (cow and goat rumen, a biogas reactor digesting sorghum biomass) were compared for their enhancement potential on the anaerobic digestion of wheat straw. Methane yields were determined in batch tests using the Automatic Methane Potential Test System operated for 30 days under mesophilic conditions. All cultures had positive effects on substrate degradation, and higher methane yields were observed in the bioaugmented reactors compared to control reactors set up with standard inoculum. However, the level of enhancement differed according to the type of the enrichment culture. Methane yield in batch reactors augmented with 2% cow rumen derived enrichment culture was increased by only 6%. In contrast, reactors amended with 2% goat rumen derived enrichment culture or with the bioaugmentation culture obtained from the biogas reactor digesting sorghum biomass produced 27 and 20% more methane, respectively. The highest methane yield was recorded in reactors amended with 6% goat rumen derived enrichment culture, which represented an increase by 36%. The microbial communities were quite similar at the end of the batch tests independently of the bioaugmentation sources, indicating that the introduced microbial communities of the enrichment cultures did not dominate the reactors.

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Investigation of effect of particle size and rumen fluid addition on specific methane yields of high lignocellulose grass silage

Cited by 39 publications

References 28 publications

Impacts of characteristics of grass silage and cattle slurry feedstocks on the cost of methane production

Impacts of characteristics of grass silage and cattle slurry feedstocks on the cost of methane production

Investigating two-phase digestion of grass silage for demand-driven biogas applications: Effect of particle size and rumen fluid addition

Bioaugmentation of anaerobic digesters treating lignocellulosic feedstock by enriched microbial consortia

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