Impact of mechanical, chemical and enzymatic pre-treatments on the methane yield from the anaerobic digestion of switchgrass

Frigon, Jean‐Claude; Mehta, P.; Guiot, Serge R.

doi:10.1016/j.biombioe.2011.02.013

Cited by 135 publications

(67 citation statements)

References 42 publications

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“…The C:N and C:P ratios were analyzed only for the Larose manure and reached 21:1 and 65:1, respectively. The summer-harvested switchgrass (SHS) contained on a dry matter basis 28.1, 37.4 and 24.6% of lignin, hemicellulose and cellulose, respectively [18]. Therefore, a significant fraction of the organic solids, e.g., lignin, could be considered anaerobically non biodegradable.…”

Section: Resultsmentioning

confidence: 99%

“…The preparation of the methane potential assays was based on the Biochemical Methane Potential (BMP) assay for wastewater from Cornacchio et al [19] and modified as described in [18]. The inoculum was starved for 48 h prior to the start-up of the assays, by being incubated at 35°C and 125 rpm agitation without substrate.…”

Section: Methane Potential Assaysmentioning

confidence: 99%

“…The ratio of inoculum to sample was set at 1:1 on a volatile solids (VS) concentration basis as suggested by Lehtomaki et al [20] for grass silage methane potential assays. Each bottle received 20 grams of inoculum, 6 mL of defined media, 8 mL of bicarbonate buffer and 1 mL of reducing agent [18].…”

Section: Methane Potential Assaysmentioning

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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methane Potential Assaysmentioning

confidence: 99%

Section: Methane Potential Assaysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 subtrates with high content of cellulose and lignin that interlink each other [10], becomes difficult to hydrolyze, so that the yield of biogas is low. To overcome this, some researchers have proposed some pretreatment processes before processing in AD, such as thermo-chemical [12], thermal [2,1], mechanical-chemical-enzymatic [3], alkaline [7], and biological [9] pretreatments. The methods are successful for enhancing the yield of biogas, but the pretreatment processes are less practical, as they require additional equipment and also sometimes use additional chemicals that may add an operational cost.…”

Section: Introductionmentioning

confidence: 99%

Enhancing biogas quality of indigofera plant waste through co-digestion with cow dung

2018

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Abstract. The production process of indigofera plants yields 10% of blue natural dyes and wastes are 90%.The biomass wastes from the extraction of indigofera plants are classified as difficult to process in an Anaerobic Digester (AD) because of the large content of hemicellulose in the Indigofera stems. Therefore, the study reports the anaerobic digestion of Indigofera plant wastes co-digested with cow dung for enhancing the biogas quality. The digestion process was conducted in a vessel of 160 L with various weight ratios between Indigofera biomass and cow dung by 0%, 25%, 50%, 75%, and 100%. The results show that the AD reactor temperature kept above 29.5°C with a pH between 6-7 were the key factors for enhancing the biogas quality. The co-digestion between 50% indigofera wastes with 50% cow dung yielded biogas with a CH4 content of about 42% and H2S concentration below 40 ppm showing that the biogas has the potential to be further improved in quality and can be used to fuel the stove and power generation.

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Anaerobic Digestion and the Use of Pre‐treatments on Lignocellulosic Feedstocks to Improve Biogas Production and Process Economics

Williams

Gallagher

Bryant

et al. 2017

Advances in Biofeedstocks and Biofuels

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Impact of mechanical, chemical and enzymatic pre-treatments on the methane yield from the anaerobic digestion of switchgrass

Cited by 135 publications

References 42 publications

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

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

Enhancing biogas quality of indigofera plant waste through co-digestion with cow dung

Anaerobic Digestion and the Use of Pre‐treatments on Lignocellulosic Feedstocks to Improve Biogas Production and Process Economics

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