Recovery of reducing sugars and volatile fatty acids from cornstalk at different hydrothermal treatment severity

Zhu, Zhangbing; Liu, Zhidan; Zhang, Yuanhui; Li, Baoming; Lu, Haifeng; Duan, Na; Si, Buchun; Shen, Ruixia; Lu, Jianwen

doi:10.1016/j.biortech.2015.08.043

Cited by 71 publications

(36 citation statements)

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“…The HTL liquid products mostly consisted of reducing sugars, VFAs, furfural, and 5-HMF (Table 1), which occupied 93.3% of all products (based on the COD). Compared with previous results [23], a low yield of reducing sugars was observed, probably due to the reactor scale used in this study. Compared with the 500 mL reactor in a previous study, the bigger reactor (1.8 L) used in this study had a slower heating and cooling rate.…”

Section: Resultscontrasting

confidence: 99%

“…HTL was conducted to get a high yield of liquid products from cornstalk. Our recent study [23] reported a high rate of liquefaction (up to 57.89%) and recovery of sugars and volatile fatty acids (VFAs) (up to 92.39% of aqueous products) from cornstalk via HTL. The liquid products from cornstalk after HTL were fed into the fermentation systems.…”

Section: Introductionmentioning

confidence: 99%

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Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Zhu

et al. 2016

Biotechnol Biofuels

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BackgroundBiohythane production via two-stage fermentation is a promising direction for sustainable energy recovery from lignocellulosic biomass. However, the utilization of lignocellulosic biomass suffers from specific natural recalcitrance. Hydrothermal liquefaction (HTL) is an emerging technology for the liquefaction of biomass, but there are still several challenges for the coupling of HTL and two-stage fermentation. One particular challenge is the limited efficiency of fermentation reactors at a high solid content of the treated feedstock. Another is the conversion of potential inhibitors during fermentation. Here, we report a novel strategy for the continuous production of biohythane from cornstalk through the integration of HTL and two-stage fermentation. Cornstalk was converted to solid and liquid via HTL, and the resulting liquid could be subsequently fed into the two-stage fermentation systems. The systems consisted of two typical high-rate reactors: an upflow anaerobic sludge blanket (UASB) and a packed bed reactor (PBR). The liquid could be efficiently converted into biohythane via the UASB and PBR with a high density of microbes at a high organic loading rate.ResultsBiohydrogen production decreased from 2.34 L/L/day in UASB (1.01 L/L/day in PBR) to 0 L/L/day as the organic loading rate (OLR) of the HTL liquid products increased to 16 g/L/day. The methane production rate achieved a value of 2.53 (UASB) and 2.54 L/L/day (PBR), respectively. The energy and carbon recovery of the integrated HTL and biohythane fermentation system reached up to 79.0 and 67.7%, respectively. The fermentation inhibitors, i.e., 5-hydroxymethyl furfural (41.4–41.9% of the initial quantity detected) and furfural (74.7–85.0% of the initial quantity detected), were degraded during hydrogen fermentation. Compared with single-stage fermentation, the methane process during two-stage fermentation had a more efficient methane production rate, acetogenesis, and COD removal. The microbial distribution via Illumina MiSeq sequencing clarified that the biohydrogen process in the two-stage systems functioned not only for biohydrogen production, but also for the degradation of potential inhibitors. The higher distribution of the detoxification family Clostridiaceae, Bacillaceae, and Pseudomonadaceae was found in the biohydrogen process. In addition, a higher distribution of acetate-oxidizing bacteria (Spirochaetaceae) was observed in the biomethane process of the two-stage systems, revealing improved acetogenesis accompanied with an efficient conversion of acetate.ConclusionsBiohythane production could be a promising process for the recovery of energy and degradation of organic compounds from hydrothermal liquefied biomass. The two-stage process not only contributed to the improved quality of the gas fuels but also strengthened the biotransformation process, which resulted from the function of detoxification during biohydrogen production and enhanced acetogenesis during biomethane production.Electronic supplementary materialThe online versio...

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Zhu

et al. 2016

Biotechnol Biofuels

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“…Biopolymer breakdown is usually performed via energy intensive processing of the cellulose and hemicellulose fractions contained in the biomass into sugars; while subsequent fermentation processes convert the simple sugars into fuels and/or chemicals. The complex polymer composition of biomass, including cellulose, hemicellulose, and lignin polymers, makes direct and efficient conversion to bioenergy particularly difficult (Zhu et al, 2016). The combination of elevated temperatures and favorable solvent properties makes subcritical/supercritical processing a promising alternative to conventional biological and chemical processes for decomposition of the lignocellulosic complex (Rostagno et al, 2015).…”

Section: Biomassmentioning

confidence: 99%

“…In addition, increasing the temperature to 300°C decreased the yield, which the authors attributed it to the degradation of primary sugars to form acetic acid and 2-methyltetrahydrofuran ( Lin et al, 2015). Zhu et al (2016) studied the conversion of corn ear to reducing sugars by hydrothermal treatment at 190-320°C. Their results showed complete degradation of hemicellulose and cellulose, with sugars yields varying between 5.15% and 13.31%.…”

Section: Subcritical and Supercritical Water Hydrolysis Technologymentioning

confidence: 99%

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

et al. 2017

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Please cite this article as: Lachos-Perez D., Brown A.B., Mudhoo A., Martinez J., Timko M.T., Rostagno M.A., Forster-Carneiro T. Subcritical and supercritical water extraction, hydrolysis, gasification and carbonization of biomass: a critical review. Biofuel Research Journal 14 (2017) HIGHLIGHTSØAdvances of research trends in development of subcritical and supercritical water processes technologies are reviewed.Essential aspects of sub-and supercritical water applied to extraction, hydrolysis, carbonization and gasification processes are discussed. ØEquipment design, process parameters, and types of biomass used for sub-and supercritical water process are presented. ØBioactive compounds, reducing sugars, hydrogen, biodiesel, and hydrothermal char are the final products of sub-and supercritical water processes. This review summarizes the recent essential aspects of subcritical and supercritical water technology applied to the extraction, hydrolysis, carbonization, and gasification processes. These are clean and fast technologies which do not need pretreatment, require less reaction time, generate less corrosion and residues, do not use toxic solvents, and reduce the synthesis of degradation byproducts. The equipment design, process parameters, and types of biomass used for subcritical and supercritical water process are presented. The benefits of catalysis to improve process efficiency are addressed. Bioactive compounds, reducing sugars, hydrogen, biodiesel, and hydrothermal char are the final products of subcritical and supercritical water processes. The present review also revisits advances of the research trends in the development of subcritical and supercritical water process technologies. GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT

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“…Dogaris et al (2009) [20], con factores de severidad de entre 3,07 y 4,54 (20 min y entre 160 y 210 o C), obtuvieron despolimerizaciones de entre 23,28 y 82,55% de la hemicelulosa, y entre 3,86 y 11,34 para la celulosa en muestras de bagazo de sorgo, y una concentración de azúcares reductores de 13,75%. La pulpa de la remolacha azucarera, residuo de la producción de azúcar de remolacha y con 68% de carbohidratos, fue tratada a 140 o C y 15 min con pretratamiento hidrotermal (logR 0 de 2,35), obteniendo un aumento en los azúcares disueltos de 5 a 30% [24], obteniendo resultados desfavorables a 170 o C. Para tallos de maíz se encontró que un pretratamiento hidrotermal de 220 o C y 46 min (logR 0 de 5,16), genera una concentración de azúcares reductores de 13%, y severidades mayores, generan reducción de estos azúcares [25]. Para la aplicación comercial de esta tecnología es importante evaluar adicionalmente la producción de componentes inhibidores del crecimiento de los microorganismos de …”

Section: Modelado Del Secado Al Solunclassified

Biorefinación del fruto del Prosopis juliflora para producción de etanol. Evaluación de las etapas de acondicionamiento y pretratamiento

Guillén

Noguera

Chirino

et al. 2017

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Los frutos del Prosopis juliflora, tienen el potencial de ser materia prima en la producción de bioetanol debido a su elevado contenido de carbohidratos y fibra, y su alta productividad en localidades áridas. Frutos de P. juliflora fueron caracterizados químicamente, fue modelada su cinética de secado al sol y fueron evaluados 2 pretratamientos fisicoquímicos. Las frutos resultaron tener 12,51% de Humedad en base húmeda (bh), 14,84% de proteínas, 2,27% de grasa, 20,15% de fibra, 58,49% de Extracto libre de nitrógeno (ELN) y 4,25% de ceniza, en base seca (bs). El modelo Faneite-Suárez es el que mejor predice el secado al sol, dentro del rango de condiciones meteorológicas imperantes. El pretratamiento ácido (6% de ácido sulfúrico, por 20 min, a 121oC) fue con el que se obtuvo el mayor contenido de azúcares reductores, un 37,85%. Los frutos evaluados pueden ser usados en la producción de bio-etanol mediante una ruta de procesamiento técnicamente factible y sostenible.

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Recovery of reducing sugars and volatile fatty acids from cornstalk at different hydrothermal treatment severity

Cited by 71 publications

References 35 publications

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Continuous production of biohythane from hydrothermal liquefied cornstalk biomass via two-stage high-rate anaerobic reactors

Applications of subcritical and supercritical water conditions for extraction, hydrolysis, gasification, and carbonization of biomass: a critical review

Biorefinación del fruto del Prosopis juliflora para producción de etanol. Evaluación de las etapas de acondicionamiento y pretratamiento

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