Evaluation of Biogas Production Potential by Dry Anaerobic Digestion of Switchgrass–Animal Manure Mixtures

Ahn, Heekwon; Smith, Matt C.; Kondrad, Shannon L.; White, Jeffrey W.

doi:10.1007/s12010-009-8624-x

Cited by 167 publications

(93 citation statements)

References 25 publications

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“…pH reduction leads to the acidaccumulation result in inhibition of methanogenesis, since easily digestible compounds of organic matter is hydrolyzed and quickly transformed into fatty acids and it will be stabilized by the VFAs consumption result in methane generation (Li et al, 2011). Generally the methane formation occurs in a relatively narrow range of pH from about 6.5 -8.5 with an optimal range between 7.0 and 8.0 as noted by Weiland (2010) and Ahn et al (2010). Methane production during co-digestion of pig slurry with food waste (leftovers) and biowaste was lower than in mono-digestion due to the rapid hydrolysis and acidogenesis and composition of co-substrates.…”

Section: Discussionmentioning

confidence: 85%

Influence of Co-substrates for the Methane Production Rate Kinetics in Anaerobic Fermentation of Pig Slurry

Korazbekova¹,

Bakhov²,

Mutaliyeva³

2015

MAS

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The influence of co-substrates on kinetics of methane production in anaerobic fermentation of pig slurry was studied by performing a series of laboratory experiments using food waste and biowaste as co-substrates. Experiments were performed in the laboratory reactors of «Hohenheim» biogas testing system in batch mode at the temperature of 37ºC. Given 40 g of fresh pig slurry was fed to each digester and mixed with co-substrates in the ration of 55:45% by organic dry matter content. Methane production rate was used to evaluate co-digestion of pig slurry. Research results showed that co-substrates gave significant effect to methane production kinetics. The kinetic parameters of methane production i.e. potential yield of methane (P), maximum methane yield rate (R m ) and duration of lag-phase (λ) were analyzed using modified Gompertz equation. Technical time to produce 95% of potential methane yield was investigated and efficient period of anaerobic digestion was calculated. The potential production of methane was reached in lag-phase duration (λ) of 10-13 days. Maximal methane production rate was reduced 2-3 times in co-digestion than in mono-digestion of pig slurry. The potential yield of methane (P) was 0. (kg оDM) -1 in mono-digestion and co-digestion of pig slurry with food waste and biowaste, respectively.

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Section: Discussionmentioning

confidence: 85%

Influence of Co-substrates for the Methane Production Rate Kinetics in Anaerobic Fermentation of Pig Slurry

Korazbekova¹,

Bakhov²,

Mutaliyeva³

2015

MAS

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“…3gk g -1 (weeks [16][17][18][19] for an average of 73.9 ± 7.5 g kg -1 (Table 2). This decrease in the TVS concentration resulted from the partial degradation of the switchgrass during storage and will be discussed later on.…”

Section: Experiments With the Continuous Digestersmentioning

confidence: 99%

“…However, the literature for the methane potential of switchgrass remains scarce [16][17][18]. The purpose of this study was therefore to evaluate the effect of adding switchgrass as a co-digestion substrate to dairy bovine manure, in order to confirm the increase in methane produced by an anaerobic digester.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic co-digestion of dairy manure with mulched switchgrass for improvement of the methane yield

Frigon

Roy

Guiot

2011

Bioprocess Biosyst Eng

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The owners of farm-scale anaerobic digesters are relying on off-farm wastes or energy crops as a co-digestion feedstock with animal manure in order to increase their production of methane and thus revenues. Switchgrass represents an interesting feedstock for Canadian digesters owners as it is a high-yielding low-maintenance perennial crop, well adapted to northern climate. Methane potential assays in batch tests showed methane production of 19.4 ± 3.6, 28.3 ± 1.7, 37.3 ± 7.1 and 45.7 ± 0.8 L kg -1 , for raw manure, blended manure, manure and mulched switchgrass, manure and pretreated switchgrass, respectively. Two 6-L lab-scale anaerobic digesters were operated for 130 days in order to assess the benefit of co-digesting switchgrass with bovine manure (digester #2), at a 20% wet mass fraction, compared with a manure-only operation (digester #1) The digesters were operated at an hydraulic retention time of 37 ± 6 days and at loads of 2.4 ± 0.6 and 2.6 ± 0.6 kg total volatile solids (TVS) L -1 day -1 for digesters #1 (D1) and #2 (D2), respectively. The TVS degradation reached 25 and 39%, which resulted in a methane production of 1.18 ± 0.18 and 2.19 ± 0.31 L day -1 for D1 and D2, respectively. The addition of 20% on a wet mass ratio of switchgrass to a manure digester increased its methane production by 86%. The co-digestion of switchgrass in a 500 m 3 manure digester could yield up to 10.2 GJ day -1 of purified methane or 1.1 MWh day -1 of electricity.

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“…Avoiding dilution of cow manure fed to anaerobic digestion (AD) is an important engineering design objective. In this context, dry anaerobic digestion (DAD) of high-solids agricultural wastes is a relatively new biotechnology, which could be adapted to digest undiluted cow manure [8][9][10]. Compared to WAD, DAD offers significant reduction in bioreactor volume [11].…”

Section: Introductionmentioning

confidence: 99%

Impact of Organic Loading Rate on Psychrophilic Anaerobic Digestion of Solid Dairy Manure

Saady

Massé

2015

Energies

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Abstract:Increasing the feed total solids to anaerobic digester improves the process economics and decreases the volume of liquid effluent from current wet anaerobic digestion. The objective of this study was to develop a novel psychrophilic (20 °C) anaerobic digestion technology of undiluted cow feces (total solids of 11%-16%). Two sets of duplicate laboratory-scale sequence batch bioreactors have been operated at organic loading rates (OLR) of 6.0 to 8.0 g total chemical oxygen demand (TCOD) kg) during 210 days. The results demonstrated that the process is feasible at treatment cycle length (TCL) of 21 days; however, the quality of cow feces rather than the OLR had a direct influence on the specific methane yield (SMY). The SMY ranged between 124.5 ± 1.4 and 227.9 ± 4.8 normalized liter (NL) CH4 kg . Substrate-to-inoculum mass ratio (SIR) was 0.63 ± 0.05, 0.90 ± 0.09, and 1.06 ± 0.07 at OLR of 6.0, 7.0, and 8.0 g TCOD kg, respectively. No volatile fatty acids (VFAs) accumulation has been observed which indicated that hydrolysis was the rate limiting step and VFAs have been consumed immediately. Bioreactors performance consistency in terms of the level of SMYs, VFAs concentrations at end of the TCL, pH stability and volatile solids reduction indicates a stable and reproducible process during the entire operation.

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Evaluation of Biogas Production Potential by Dry Anaerobic Digestion of Switchgrass–Animal Manure Mixtures

Cited by 167 publications

References 25 publications

Influence of Co-substrates for the Methane Production Rate Kinetics in Anaerobic Fermentation of Pig Slurry

Influence of Co-substrates for the Methane Production Rate Kinetics in Anaerobic Fermentation of Pig Slurry

Anaerobic co-digestion of dairy manure with mulched switchgrass for improvement of the methane yield

Impact of Organic Loading Rate on Psychrophilic Anaerobic Digestion of Solid Dairy Manure

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