Effect of Mechanical Pre-Treatment of the Agricultural Substrates on Yield of Biogas and Kinetics of Anaerobic Digestion

Szlachta, Jacek; Prask, Hubert; Fugol, Małgorzata; Luberański, A.

doi:10.3390/su10103669

Cited by 23 publications

(10 citation statements)

References 22 publications

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“…Nevertheless, the methane yield and VS reduction could also vary as a result of different between substrate and inoculum. Generally, methane yield of 200–330 NmL/gVS with VS reduction rate of around 50 % from sorghum was reported in the previous studies [ 25 , 26 ].…”

Section: Resultsmentioning

confidence: 85%

The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

Kobayashi

et al. 2020

Biotechnology Reports

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Highlights Rick husk biochar addition mitigated the pH decrease during high load sorghum AD. 20 g/L biochar addition reduced the peak total VFA by 375 mg/L at F/M ratio of 1.2. Maximum methane production rate was increased by 25 % with 15 g/L biochar addition. Lag phase time was decreased by 45 % with 15 g/L biochar addition.

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Section: Resultsmentioning

confidence: 85%

The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

Kobayashi

et al. 2020

Biotechnology Reports

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“…With 1 ton of sorghum silage, it produced biogas with 54% methane content. The highest cumulative values of biogas production were obtained for Elvira beet, the methane content was 64 % [32]. In our study the average methane content in grass silages was 66.9% and 68.6% for Biogas A and Biogas B inoculants, respectively.…”

Section: Discussionmentioning

confidence: 41%

Increasing Biogas Yield from Fodder by Microbial Stimulation of Propionic Acid Synthesis in Grass Silages

et al. 2021

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A new direction in the use of lactic acid bacteria inoculants is their application for renewable raw materials ensiling for biogas production. The aim of the study was to demonstrate the possibility of stimulating the synthesis of propionic acid in the process of co-fermentation of selected strains of Lactobacillus buchneri and L. diolivorans as well as L. buchneri and Pediococcus acidilactici. L. buchneri KKP 2047p and P. acidilactici KKP 2065p were characterized by the special capabilities for both synthesis and metabolism of 1,2-propanediol. L. diolivorans KKP 2057p stands out for the ability to metabolize 1,2-propanediol to propionic acid. As a result of the co-fermentation a concentration of propionic acid was obtained at least 1.5 times higher in the final stage of culture in comparison to cultivating individual species of bacteria separately. The results of in vitro experiments were applied in agricultural practice, by application of two lactic acid bacteria inoculants in ensiling of grass silage and improving its suitability for biogas production. Grass silages made with the addition of the inoculant were characterized by the content of 1,2-propanediol, 1-propanol and propionic acid ensured extension of the aerobic stability from 4 to 7 days in comparison to untreated silages. It was found that the use of both inoculants resulted in an approximately 10 - 30% increase in biogas yield from this raw material.

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“… a m 3 t dm −1 of biogas yield from the dry organic mass depending on the literature data [ 4 ] b m 3 t dm −1 of biogas yield calculated, based on the methanogenic potential of recirculate measured in the experiments in the laboratory scale c 350 m 3 t dm −1 of biogas yield calculated, based on the methanogenic potential of LHW-SE WS according to the laboratory data, measured in the experiments in the laboratory scale d 600 m 3 t dm −1 of biogas yield obtained according to the biogas plant data …”

Section: Resultsmentioning

confidence: 99%

“…The biogas potential estimated in the experiments was 350 m 3 t dm −1 of biogas yield, but the value estimated from the theoretical and actual yield revealed 600 m 3 t dm −1 of biogas yield from LHW-SE pretreated wheat straw. The difference between the laboratory-estimated and experimentally measured methanogenic potential of wheat straw may have resulted from the positive impact of the different substrates used in co-digestion [ 4 ].…”

Section: Resultsmentioning

confidence: 99%

“…Biogas substrates vary in terms of the decomposition rate and in methane production yield. Therefore, a combination of feed additives and pretreatment methods should give the highest efficiency of a biogas production while reducing the decomposition time required for a substrate [ 4 ]. There are several methods of substrate pretreatment to improve the decomposition and methane yield [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion

Gaworski

Jabłoński

Pawlaczyk-Graja

et al. 2017

Biotechnol Biofuels

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BackgroundPig manure utilization and valorization is an important topic with tightening regulations focused on ecological and safety issues. By itself pig manure is a poor substrate for biogas production because of its excessive nitrogen content relative to available organic carbon. Such substrate is alkaline, and methanogenesis can be suppressed, and so additional substrates with high organic carbon must be added. The most promising is straw, which is available from adjacent biogas plant cultures. However, the abundant lignocellulosic biomass of wheat straw undergoes slow decomposition, and only a fraction of the chemical energy can be converted into biogas; thus economical methods for pretreatment increasing bioavailability are sought.ResultsA method was investigated to increase the methane yield in a full-scale plant for co-fermenting pig manure with corn silage, which was the default substrate in the original source reactors. Increased lignocellulosic bioavailability of wheat straw was achieved by combining liquid hot water (LHW) and steam explosion (SE). According to FT-IR analysis, the treatment resulted in hemicellulose hydrolysis, partial cellulose depolymerization, and lignin bond destruction. Low-mass polysaccharides (0.6 × 103 g mol−1) had significantly higher concentration in the leachate of LHW-SE wheat straw than raw wheat straw. The methanogenic potential was evaluated using inoculum from two different biogas plants to study the influence of microorganism consortia. The yield was 24–34% higher after the pretreatment process. In a full-scale biogas plant, the optimal conditions were ~ 165 °C, ~ 2.33 MPa, and 10 min in LHW and ~ 65 °C and ~ 0.1 MPa for SE. The processes did not generate detectable inhibitors according to GC–MS analysis, such as furfural and 5-hydroxymethylfurfural.ConclusionsThe LHW-SE combined pretreatment process increases the bioavailability of carbohydrates from wheat straw. The LHW-SE treated wheat straw gave similar biogas yields to corn silage, thus enables at least partial replacement of corn silage and is good for diversification of substrates. Surprisingly, microorganisms consortia from other biogas plant fed with other substrates may have higher efficiency in utilization of tested substrate. Thus, methanogenic consortia may be considered in the process of optimization at industrial scale. The efficiency was calculated, and the LHW-SE may be profitable at full industrial scale and further optimization is proposed.

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Effect of Mechanical Pre-Treatment of the Agricultural Substrates on Yield of Biogas and Kinetics of Anaerobic Digestion

Cited by 23 publications

References 22 publications

The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

The role of rice husk biochar addition in anaerobic digestion for sweet sorghum under high loading condition

Increasing Biogas Yield from Fodder by Microbial Stimulation of Propionic Acid Synthesis in Grass Silages

Enhancing biogas plant production using pig manure and corn silage by adding wheat straw processed with liquid hot water and steam explosion

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