Enhanced biogas production from sunflower stalks using hydrothermal and organosolv pretreatment

Hesami, Seyed Mehdi; Zilouei, Hamid; Karimi, Keikhosro; Asadinezhad, Ahmad

doi:10.1016/j.indcrop.2015.07.018

Cited by 102 publications

(33 citation statements)

References 28 publications

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“…The BMP of the untreated sunflower stalks was also higher than this study (193 mL CH 4 g −1 raw vs. > 128 mL CH 4 g −1 raw VS). Furthermore, Hesami et al [16] reported much higher values, compared to this study, BMPs from sunflower stalks after hydrothermal (180 • C, 60 min) and isopropanol-based organosolv pretreatment (160 • C, 30 min, 1% H 2 SO 4 ), of 234 and 278 mL CH 4 g −1 VS, respectively. However, the methane production yield obtained from the digestion of untreated stalks was lower (124 mL CH 4 g −1 VS) than this study.…”

Section: Pretreatment Effect On the Biochemical Methane Potential (Bmcontrasting

confidence: 56%

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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Sunflower residues are considered a prominent renewable source for biogas production during anaerobic digestion (AD). However; the recalcitrant structure of this lignocellulosic substrate requires a pretreatment step for efficient biomass transformation and increased bioenergy output. The aim of the present study was to assess the effect of alkaline pretreatment of various parts of the sunflower residues (e.g., heads and stalks) on their methane yield. Experimental data showed that pretreatment at mild conditions (55 °C; 24 h; 4 g NaOH 100 g−1 total solids) caused an increase in the biochemical methane potential (BMP) of both heads and stalks of the sunflower residues as determined in batch tests. The highest methane production (268.35 ± 0.11 mL CH4 g−1 volatile solids) was achieved from the pretreated sunflower head residues. Thereafter; the effect of alkaline pretreatment of sunflower head residues was assessed in continuous mode; using continuous stirred-tank reactors (CSTRs) under two operational phases. During the first phase; the CSTRs were fed with the liquid fraction produced from the pretreatment of sunflower heads. During the second phase; the CSTRs were fed with the whole slurry resulting from the pretreatment of sunflower heads (i.e., both liquid and solid fractions). In both operating phases; it was observed that the alkaline pretreatment of the sunflower head residues had a negligible (phase I) or even a negative effect on biogas production; which was contradictory to the results of the BMP tests. It seems that; during alkaline pretreatment; this part of the sunflower residues (heads) may release inhibitory compounds; which induce a negative effect on biogas production in the long term (e.g., during continuously run digesters such as CSTR) but not in the short-term (e.g., batch tests) where the effect of the inoculum may not permit the inhibition to be established.

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Section: Pretreatment Effect On the Biochemical Methane Potential (Bmcontrasting

confidence: 56%

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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“…Therefore, its biotransformation to biofuels cannot be easily conducted. [33][34][35][36] However, these lignocellulosic biomasses contain soluble, fermentable sugars (Table 4), natural intermediates in conversion to biofuels, but access to sugars is hindered by the recalcitrance of plant cell walls. Therefore, deriving sugars from this material requires mechanical, physical or chemical disruption.…”

Section: Agricultural Lignocellulosic Biomassmentioning

confidence: 99%

Soybean Straw, Corn Stover and Sunflower Stalk as Possible Substrates for Biogas Production in Croatia: A Review

Kovačić

Kralik

Rupčić

et al. 2017

Chem.Biochem.Eng.Q.

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Biomass availability is one of the key factors for biogas production in the future. The current status and possibilities for utilizing harvest residues (soybean straw, corn stover and sunflower stalk) in Croatia for biogas production is given. In the last few decades, different pretreatment methods have been developed for the degradation of different lignocellulosic biomass, but many of them are environmentally unfriendly and sometimes very expensive. More research and development is necessary in order to find both economically and environmentally friendly pretreatment methods. This paper provides a review on the mechanical, physical, and biological methods used for different lignocellulose material pretreatment. Harvest residues are usually left in the field, but with the improvement of the pretreatment process along with soil protection, they could be used for the production of huge amounts of energy in the future.

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“…The integration of HTL and anaerobic fermentation has been reported as a way that could enhance methane production from various lignocellulosic biomasses, including sunflower oil cake [14], sorghum forage [15], wheat straw [15, 16], sugar beet [17], rice straws [18], and sunflower stalks [19]. The methane production was increased in a range of 6.5–222% in these studies [14–19]. However, there are still several challenges for successful integration.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are still several challenges for successful integration. Firstly, the limited efficiency of fermentation reactors is a large bottleneck, as low HTL temperatures (100–200 °C) [14–19] in these studies resulted in a high solid content feedstock. Usually, batch reactors or conventional continuous stirred anaerobic reactors (CSTR) are used.…”

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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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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Enhanced biogas production from sunflower stalks using hydrothermal and organosolv pretreatment

Cited by 102 publications

References 28 publications

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

Soybean Straw, Corn Stover and Sunflower Stalk as Possible Substrates for Biogas Production in Croatia: A Review

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

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