Enhanced Methane Production from Anaerobic Co-Digestion of Wheat Straw and Herbal-Extraction Process Residues

This study assessed the breakdown of lignocellulosic biomass (LB) with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]) as a pretreatment to increase the methane yield. The pretreatment was conducted for wheat straw (WS), barley straw (BS), and grape stem (GS) at 120 °C for 120 min, using several LB to [Emim][Ac] ratios (1:1, 1:3, and 1:5 w/w). Pretreatment significantly disrupted the lignocellulose matrix of each biomass into soluble sugars. GS showed the highest sugar yield, which was followed by WS, while BS was slightly hydrolyzed (175.3 ± 2.3, 158.2 ± 5.2, and 51.1 ± 3.1 mg glucose g–1 biomass, respectively). Likewise, the pretreatment significantly reduced the cellulose crystallinity index (CrI) of the resulting solid fractions of GS and WS by 15% and 9%, respectively, but slightly affected the CrI of BS (5%). Thus, BMP tests were only carried out for raw and hydrothermally and [Emim][Ac] (1:5) pretreated GS and WS. The untreated GS and WS showed similar methane yields to those achieved for the solid fraction obtained after pretreatment with an LB to [Emim][Ac] ratio of 1:5 (219 ± 10 and 368 ± 1 mL CH4 g–1 VS, respectively). The methane production of the solid plus liquid fraction obtained after IL pretreatment increased by 1.61- and 1.34-fold compared to the raw GS and WS, respectively.

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Anaerobic Digestion of Wastewater Sludge and Alkaline-Pretreated Wheat Straw at Semi-Continuous Pilot Scale: Performances and Energy Assessment

Energies ◽

10.3390/en14175391 ◽

2021 ◽

Vol 14 (17) ◽

pp. 5391

Author(s):

Christine Peyrelasse ◽

Abdellatif Barakat ◽

Camille Lagnet ◽

Prasad Kaparaju ◽

Florian Monlau

Keyword(s):

Wheat Straw ◽

Methane Production ◽

Stable Process ◽

Pilot Scale ◽

Economic Benefits ◽

Full Scale ◽

Alkaline Pretreatment ◽

Wastewater Sludge ◽

Reactor Performance ◽

Scale Reactor

During the last decade, the application of pretreatment has been investigated to enhance methane production from lignocellulosic biomass such as wheat straw (WS). Nonetheless, most of these studies were conducted in laboratory batch tests, potentially hiding instability problems or inhibition, which may fail in truly predicting full-scale reactor performance. For this purpose, the effect of an alkaline pretreatment on process performance and methane yields from WS (0.10 g NaOH g−1 WS at 90 °C for 1 h) co-digested with fresh wastewater sludge was evaluated in a pilot-scale reactor (20 L). Results showed that alkaline pretreatment resulted in better delignification (44%) and hemicellulose solubilization (62%) compared to untreated WS. Pilot-scale study showed that the alkaline pretreatment improved the methane production (261 ± 3 Nm3 CH4 t−1VS) compared to untreated WS (201 ± 6 Nm3 CH4 t−1VS). Stable process without any inhibition was observed and a high alkalinity was maintained in the reactor due to the NaOH used for pretreatment. The study thus confirms that alkaline pretreatment is a promising technology for full-scale application and could improve the overall economic benefits for biogas plant at 24 EUR t−1 VS treated, improve the energy recovery per unit organic matter, reduce the digestate volume and its disposal costs.

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Methane Production Potential of Rumen Pretreated Lignocellulosic Wastes

10.21203/rs.3.rs-169652/v1 ◽

2021 ◽

Author(s):

GOKCE KURT ◽

Rumeysa Doluk ◽

Hulya Civelek Yoruklu ◽

Ahmet Demir ◽

Bestami Ozkaya

Keyword(s):

Wheat Straw ◽

Methane Production ◽

Solid Phase ◽

Biogas Production ◽

Cotton Stalk ◽

Rumen Microorganisms ◽

Lignocellulosic Wastes ◽

Gas Measurements ◽

Two Phases ◽

Pretreated Wheat Straw

Abstract Bioenergy production from lignocellulosic biomass is challenging due to its structure and a pretreatment is required before methane production. In this study, biological pretreatment by using rumen microorganisms was applied for different types of lignocellulosic wastes: wheat straw, cotton stalk, reeds and sunflower stalk. The reactors were pretreated for 2, 5, 10, 15 and 20 days. After the pretreatment stages and gas measurements were done, reactors were separated into two phases as lower solid phase and upper liquid phase. The reactors were installed for the methanation stage, gas measurements were made at regular intervals and graphs were drawn using the cumulative results. Modified Gompertz equation was used to estimate potential biogas production. According to the results, the reactor containing 5 days pretreated wheat straw became prominent among the other reactors in terms of biogas and methane production with 163 ml and 102 ml, respectively. It was followed by 20 days pretreated reeds with 104 ml biogas and 80 ml methane, 2 days pretreated sunflower stalk with 88 ml biogas and 52 ml methane, and 2 days pretreated cotton stalk with 87 ml biogas and 50 ml methane.

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Kinetics of methane production during anaerobic fermentation of chicken manure with sawdust and fungi pre-treated wheat straw

Waste Management ◽

10.1016/j.wasman.2019.10.046 ◽

2020 ◽

Vol 102 ◽

pp. 170-178 ◽

Cited By ~ 5

Author(s):

Darja Pečar ◽

Franc Pohleven ◽

Andreja Goršek

Keyword(s):

Wheat Straw ◽

Methane Production ◽

Anaerobic Fermentation ◽

Chicken Manure ◽

Kinetics Of

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Methanogenic potential of tailings samples from oil sands extraction plants

Canadian Journal of Microbiology ◽

10.1139/w01-129 ◽

2002 ◽

Vol 48 (1) ◽

pp. 21-33 ◽

Cited By ~ 36

Author(s):

Phillip M Fedorak ◽

Debora L Coy ◽

Myrna J Salloum ◽

Marvin J Dudas

Keyword(s):

Methane Production ◽

Oil Sands ◽

Sulfate Reducing Bacteria ◽

Extraction Process ◽

Hot Water ◽

Electron Donors ◽

Sulfate Reducing ◽

Settling Ponds ◽

Reducing Bacteria ◽

Composite Tailings

Approximately 20% of Canada's oil supply now comes from the extraction of bitumen from the oil sands deposits in northeastern Alberta. The oil sands are strip-mined, and the bitumen is typically separated from sand and clays by an alkaline hot water extraction process. The rapidly expanding oil sands industry has millions of cubic metres of tailings for disposal and large areas of land to reclaim. There are estimates that the consolidation of the mature fine tails (MFT) in the settling ponds will take about 150 years. Some of the settling ponds are now evolving microbially produced methane, a greenhouse gas. To hasten consolidation, gypsum (CaSO4·2H2O) is added to MFT, yielding materials called consolidated or composite tailings (CT). Sulfate from the gypsum has the potential to stimulate sulfate-reducing bacteria (SRB) to out-compete methanogens, thereby stopping methanogenesis. This investigation examined three MFT and four CT samples from three oil sands extractions companies. Each was found to contain methanogens and SRB. Serum bottle microcosm studies showed sulfate in the CT samples stopped methane production. However, if the microcosms were amended with readily utilizable electron donors, the sulfate was consumed, and when it reached approximately 20 mg/L, methane production began. Some unamended microcosms were incubated for 372 days, with no methane production detected. This work showed that each MFT and CT sample has the potential to become methanogenic, but in the absence of exogenous electron donors, the added sulfate can inhibit methanogenesis for a long time.Key words: consolidated tailings, composite tailings, methanogens, oil sands, sulfate-reducing bacteria.

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Response of Fumaric Acid Addition on Methanogenesis, Rumen Fermentation, and Dry Matter Degradability in Diets Containing Wheat Straw and Sorghum or Berseem as Roughage Source

ISRN Veterinary Science ◽

10.5402/2012/496801 ◽

2012 ◽

Vol 2012 ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

S. K. Sirohi ◽

Poonam Pandey ◽

Navneet Goel

Keyword(s):

Wheat Straw ◽

Fumaric Acid ◽

Methane Production ◽

Dry Matter ◽

Rumen Fermentation ◽

Kinetics Parameters ◽

Dry Matter Digestibility ◽

Acid Addition ◽

Mineral Mixture

An in vitro incubation system was used to evaluate effect of supplementation of fumaric acid at 0, 5, 10, and 15 mM concentration in high-, medium-, and low-fiber wheat straw containing total mixed diets with sorghum (Sorghum vulgare) and berseem clover (Trifolium alexandrinum L.) on rumen fermentation, methane production, and gas kinetics parameters. Three types of diets were prepared with different roughage and concentrate ratio (80 : 20, 50 : 50, and 20 : 80) by taking the representative samples. The roughage part composed of wheat straw (70 parts) and sorghum (30 parts) or berseem (30 parts) and the concentrate part composed of maize (33%), GNC (21%), mustard cake (12%), wheat bran (20%), deoiled rice bran (11%), mineral mixture (2%), and salt (1%). Fumaric acid was added in incubation medium to achieve final concentration of 0, 5, 10, and 15 mM. All the treatment combinations were arranged in 4×3 factorial designs with three replicates. It was concluded from the study that fumaric acid addition (5–15 mM) in diets varying in roughage to concentrate ratio significantly (P≤0.05) reduced the methane production without affecting dry matter digestibility and maximum reduction was noticed at 5 mM concentration.

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