Structural properties and hydrolysabilities of Chinese Pennisetum and Hybrid Pennisetum: Effect of aqueous ammonia pretreatment

Wang, Jingfeng; Xin, Donglin; Hou, Xincun; Wu, Juying; Fan, Xing; Li, Kena; Zhang, Junhua

doi:10.1016/j.biortech.2015.08.046

Cited by 31 publications

(15 citation statements)

References 29 publications

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“…The lignin content decreased from 21.1 to 12.2%. The reduction of lignin was due to the cleavage of ester linkages between carbohydrates and lignin, which lead to lignin solubilization [8,11,12]. The major loss of lignin contributed to an increase of carbohydrates by gram of the aRS solid.…”

Section: Composition and Sem Analysesmentioning

confidence: 99%

“…Aqueous ammonia pretreatment is a widely studied method to alter the structure and reduce the recalcitrance of biomass for enzymatic hydrolysis [8][9][10][11][12][13]. This method has potential to be applied in the biorefinery industry because it separates biomass components into two main fractions: carbohydrates and lignin stream owing to the delignification selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…This method has potential to be applied in the biorefinery industry because it separates biomass components into two main fractions: carbohydrates and lignin stream owing to the delignification selectivity. Different types of lignocellulosic materials, including Napier grass [8,10], rye straw [9], poplar [11], corn stover [12], and switchgrass [13], have been tested with aqueous ammonia pretreatment, and those reports have addressed positive correlation of chemical composition change (particularly high rate of lignin removal) and enzymatic digestibility.…”

Section: Introductionmentioning

confidence: 99%

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Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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Rice straw (RS) is an abundant, readily available agricultural waste, which shows promise as a potential feedstock for Asian ethanol production. To enhance release of glucose by enzymatic hydrolysis, RS was pretreated with aqueous ammonia (27% w/w) at two pretreatment temperatures: room temperature and 60 ∘ C. Statistical analysis indicated similarity of enzymatic glucose production at both pretreatment temperatures after 3-day incubation. Chemical composition, FTIR, and EDX analyses confirmed the retention of glucan and xylan in the pretreated solid, but significant reduction of lignin (60.7% removal) and silica. SEM analysis showed the disorganized surfaces and porosity of the pretreated RS fibers, thus improving cellulose accessibility for cellulase. The crystallinity index increased from 40.5 to 52.3%, indicating the higher exposure of cellulose. With 10% (w/v) solid loadings of pretreated RS, simultaneous saccharification and fermentation yielded a final ethanol concentration of 24.6 g/L, corresponding to 98% of maximum theoretical yield. Taken together, aqueous ammonia pretreatment is an effective method to generate highly digestible pretreated RS for bioethanol production and demonstrates potential application in biorefinery industry.

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Section: Composition and Sem Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural Analysis of Alkaline Pretreated Rice Straw for Ethanol Production

Phitsuwan

Permsriburasuk

Baramee

et al. 2017

International Journal of Polymer Science

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“…Due to advantages such as having high abundance, suitable biomass quality and positive environment effects, perennial grasses are widely used in biogas production . Pennisetum hybrid ( P. americanum × P. purpureum ) has high adaptability and resistance to unsuitable conditions, such as droughts or being planted on barren land; this species is a C‐4 perennial herbaceous grass and it has become an important species planted in China . This species has a significant biomass yield and a high organic content which can be easily used in biological processes, thus making it a suitable alternative feedstock for biogas production …”

Section: Introductionmentioning

confidence: 99%

“…4,5 Pennisetum hybrid (P. americanum × P. purpureum) has high adaptability and resistance to unsuitable conditions, such as droughts or being planted on barren land; this species is a C-4 perennial herbaceous grass and it has become an important species planted in China. 6,7 This species has a significant biomass yield and a high organic content which can be easily used in biological processes, thus making it a suitable alternative feedstock for biogas production. 8,9 Anaerobic digestion (AD) can be classified as liquid fermentation and solid-state fermentation using the total solid (TS) content of an input substrate.…”

Section: Introductionmentioning

confidence: 99%

Leachate recirculation effects on solid‐state anaerobic digestion of Pennisetum hybrid and microbial community analysis

Xing

Kong

Dong

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND A leach‐bed reactor (LBR) with leachate recirculation is a suitable technology for lignocellulosic biomass anaerobic digestion. In this study, the effect of percolate reflux strategies (continuous recirculation and intermittent recirculation) on methane production from Pennisetum hybrid, a type of energy crop, was investigated using a two‐layered LBR. RESULTS Compared to a solid‐state anaerobic digestion batch test, LBRs with percolate recirculation provide a stable process with a short lag phase by avoiding inhibition of volatile fatty acid accumulation and inoculation effect. The results also indicated that continuous reflux led to a lower accumulative methane yield (56.20 L kg−1 VS) compared to intermittent reflux (78.50 L kg−1 VS), resulting from washing effect and poorer distribution on the lower layer. According to microbial analysis, Bacteroidetes, Firmicutes, Proteobacteria and Synergistetes were the most predominant bacterial phyla in each LBR test sample and aceticlastic methanogen (at least >55%) plays a predominant role for methane production in all samples. CONCLUSIONS The results indicate that leachate recirculation could provide stable conditions for methane yield; however, two‐layer reactor designs which cannot guarantee the desired distribution in the lower layer result in a low methane yield. Suitable design of LBRs to maintain a well‐distributed reflux leachate should be further investigated. © 2019 Society of Chemical Industry

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