Weak-base pretreatment to increase biomethane production from wheat straw

Deng, Yuanfang; Qiu, Yaojing; Yao, Yiqing; Ayiania, Michael; Davaritouchaee, Maryam

doi:10.1007/s11356-020-09914-7

Cited by 15 publications

(9 citation statements)

References 71 publications

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“…The increased surface area and looser structure of the solids after enzymatic pretreatment rendered the lignocellulosic material more susceptible to hydrolysis (Figure S1e–h). Deng reported that these changes increased the external surface area and porosity as well as the biodegradability of lignocellulose, thereby increasing biogas production …”

Section: Resultsmentioning

confidence: 99%

“…Deng reported that these changes increased the external surface area and porosity as well as the biodegradability of lignocellulose, thereby increasing biogas production. 46 The price of enzyme-producing raw material using solidstate fermentation of synthetic microbial communities was estimated to be ∼155.72 ($/1000 L of medium) (Table S3). Table S4 shows that solid-state fermentation for enzyme production consumed 0.03115 ($/500 g enzyme) of electricity, and the price of converting this material into unit enzyme activity was ∼5.51 × 10 −5 ($/U).…”

Section: Enzymatic Pretreatment Of Wsmentioning

confidence: 99%

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Construction of a Synthetic Microbial Community for Enzymatic Pretreatment of Wheat Straw for Biogas Production via Anaerobic Digestion

Chen,

Cai,

Wang

et al. 2024

Environ. Sci. Technol.

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Biological pretreatment is a viable method for enhancing biogas production from straw crops, with the improvement in lignocellulose degradation efficiency being a crucial factor in this process. Herein, a metagenomic approach was used to screen core microorganisms (Bacillus subtilis, Acinetobacter johnsonii, Trichoderma viride, and Aspergillus niger) possessing lignocellulose-degrading abilities among samples from three environments: pile retting wheat straw (WS), WS returned to soil, and forest soil. Subsequently, synthetic microbial communities were constructed for fermentation–enzyme production. The crude enzyme solution obtained was used to pretreat WS and was compared with two commercial enzymes. The synthetic microbial community enzyme-producing pretreatment (SMCEP) yielded the highest enzymatic digestion efficacy for WS, yielding cellulose, hemicellulose, and lignin degradation rates of 39.85, 36.99, and 19.21%, respectively. Furthermore, pretreatment of WS with an enzyme solution, followed by anaerobic digestion achieved satisfactory results. SMCEP displayed the highest cumulative biogas production at 801.16 mL/g TS, which was 38.79% higher than that observed for WS, 22.15% higher than that of solid-state commercial enzyme pretreatment and 25.41% higher than that of liquid commercial enzyme pretreatment. These results indicate that enzyme-pretreated WS can significantly enhance biogas production. This study represents a solution to the environmental burden and energy use of crop residues.

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Section: Resultsmentioning

confidence: 99%

Section: Enzymatic Pretreatment Of Wsmentioning

confidence: 99%

Construction of a Synthetic Microbial Community for Enzymatic Pretreatment of Wheat Straw for Biogas Production via Anaerobic Digestion

Chen,

Cai,

Wang

et al. 2024

Environ. Sci. Technol.

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“…The carboxyl stretching band at 1730 cm −1 [43], characteristic of carboxylic acid groups in hemicellulose, exhibited no observable change in both wheat varieties. The absorption peak in the region near 1640 cm −1 , corresponding to the stretching vibrations of C=O bonds, is indicative of lignin content [16]. In the case of cold pre-treatment, there was The carboxyl stretching band at 1730 cm −1 [43], characteristic of carboxylic acid groups in hemicellulose, exhibited no observable change in both wheat varieties.…”

Section: Characterization Of Wheat Strawmentioning

confidence: 98%

“…However, a doubling of Si content and an increase in the O/C ratio (Table 2) indicate the presence of active chemical groups on the surface of the straw, which was further confirmed by FTIR. The FTIR spectra presented in Figure 7 show the absorption peaks at approximately 2850 and 2920 cm −1 , which are usually associated with the antisymmetric stretching vibration of C-H in the saturated aliphatic CH2 groups of lignin [16,42]. A reduction in the intensity of these bands indicates that the cold and hot pre-treatments decreased the aliphatic CH2 groups in lignin.…”

Section: Characterization Of Wheat Strawmentioning

confidence: 99%

“…For the effective application 2 of 14 of biomass residues in composite materials, their surface pre-treatment is needed to remove components covering the surface of biomass, such as waxes, lignin, and hemicellulose, which reduce the compatibility or bonding strength with a matrix [8,[12][13][14][15]. A survey of the literature shows that chemical or physicochemical pre-treatments utilizing organic solvents, molten oxalic dihydrate [13], sulphuric acid liquor [15], weak-base sodium carbonate solution [16], or hydrothermal pre-treatment coupled with an alkaline solution [17] are relatively fast and effective methods to disturb the structure and chemistry of lignin and cellulose. Biological enzyme technology and physical pre-treatment with steam by applying ultrasound or microwaves have also been investigated, enhancing the delignification efficiency important for bioenergy production [14,18].…”

Section: Introductionmentioning

confidence: 99%

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Surface-Modified Wheat Straw for the Production of Cement-Free Geopolymer Composite: Effects of Wheat Variety and Pre-Treatment Method

Kalpokaitė-Dičkuvienė,

Pitak,

Sholokhova

et al. 2024

J. Compos. Sci.

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The development of new composite materials with specific properties and reduced environmental pollution can be achieved by the incorporation of agricultural residues, whose morphology is strongly affected by their variety and growing conditions. Herein, the functional properties of a cement-free geopolymer composite reinforced with straw from two wheat varieties (Ada and Malibu) were investigated through different straw pre-treatment methods and their surface modification with silane coupling agents. The characterization of the wheat surface and the geopolymer composites involved SEM-EDS, TGA, FTIR, and gas physisorption analysis methods supplemented with mechanical strength and moisture ingress measurements. Mild (23 °C) and severe (100 °C) physical pre-treatment methods with chemical soaking in 7.3 M isopropanol solution were applied on wheat straw. Tetraethoxysilane (TEOS) with octadecylamine was employed for chemical surface modification. The set of geopolymer compositions was prepared with untreated, pre-treated, and modified straws. The results revealed the hot pre-treatment method caused a higher degradation of siliceous layers of straw, especially in the Ada variety. The modification with TEOS resulted in irregular silane coating formation regardless of the wheat variety and pre-treatment method. Despite good interfacial bonding of the modified straw with the geopolymer matrix, the mechanical strength of the composites was reduced, although the resistance to water ingress slightly increased. Comparing both varieties, Ada wheat showed better performance than Malibu.

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Synthesis of levulinic acid from tobacco stalk via steam explosion and oxidation–hydrolysis route

Wang,

Chen,

Guo

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDTobacco stalk, the main waste from tobacco planting, was used as raw material to produce levulinic acid, one of the most important platform chemicals. It was reported that steam explosion was an efficient method to treat lignocellulose to hydrolyze the hemicellulose component. Oxidation treatment combined with catalysis of Al2(SO4)3 proved to be efficient for the conversion of cellulose to levulinic acid in our recent report. Here, tobacco stalk was first treated by steam explosion, and then the solid residue was oxidized and converted to levulinic acid in the presence of Al2(SO4)3.RESULTSA xylo‐oligosaccharide yield of 6.6 g 100 g−1 was obtained from tobacco stalk via steam explosion. 15.4 g 100 g−1 (39.6 mol%) yield of levulinic acid was obtained from oxidized tobacco stalk in water at 180 °C in 5 h using Al2(SO4)3 as a catalyst. As high as 20.8 g 100 g−1 (53.5 mol%) yield of levulinic acid can be obtained using NaCl as a co‐catalyst.CONCLUSIONSteam explosion was efficient for the depolymerization of the hemicellulose component of tobacco stalk to xylo‐oligosaccharide. A simple salt of Al2(SO4)3 showed good catalytic activity for conversion of oxidized tobacco stalk to levulinic acid. Nicotine in tobacco stalk promoted the formation of lactic acid. Thus, the yield of levulinic acid decreased in the presence of nicotine. NaCl enhanced the catalytic performance of Al2(SO4)3. © 2024 Society of Chemical Industry (SCI).

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Weak-base pretreatment to increase biomethane production from wheat straw

Cited by 15 publications

References 71 publications

Construction of a Synthetic Microbial Community for Enzymatic Pretreatment of Wheat Straw for Biogas Production via Anaerobic Digestion

Construction of a Synthetic Microbial Community for Enzymatic Pretreatment of Wheat Straw for Biogas Production via Anaerobic Digestion

Surface-Modified Wheat Straw for the Production of Cement-Free Geopolymer Composite: Effects of Wheat Variety and Pre-Treatment Method

Synthesis of levulinic acid from tobacco stalk via steam explosion and oxidation–hydrolysis route

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