Integrated process to produce biohydrogen from wheat straw by enzymatic saccharification and dark fermentation

Zhu, Jiadong; Wu, Song; Chen, Xue; Sun, Shao‐Ni

doi:10.1016/j.ijhydene.2022.05.056

Cited by 26 publications

(5 citation statements)

References 51 publications

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“…Moreover, biohydrogen production from various sources was compared, and the results are shown in Table 3 . Hydrogen yield from DES-pretreated corncob was much higher than that of giant reed pretreated by ionic liquids [ 39 ], sugarcane bagasse pretreated by hydrochloric acid [ 50 ], wheat straw pretreated by hydrothermal alkali [ 49 ], and corncob pretreated by acid steam-explosion [ 44 , 46–48 ]. The hydrogen yields of corn stalk pretreated by 2% NaOH [ 5 ] and corncob pretreated thermochemically by 2% H 2 SO 4 [ 25 ] were similar to the yields obtained in the present study.…”

Section: Resultsmentioning

confidence: 99%

Effect of deep eutectic solvent pretreatment on biohydrogen production from corncob: pretreatment temperature and duration

Zhou,

Li,

et al. 2023

Bioengineered

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Deep eutectic solvent pretreatment with different temperatures and durations was applied to corncob to increase hydrogen yield via photo-fermentation. The correlation of composition, enzymatic hydrolysis, and hydrogen production in pretreated corncobs, as well as energy conversion was evaluated. Deep eutectic solvent pretreatment effectively dissolved lignin, retained cellulose, and enhanced both enzymatic hydrolysis and hydrogen production. The maximum cumulative hydrogen yield obtained under a pretreatment condition of 50°C and 12 h was 677.45 mL; this was 2.72 times higher than that of untreated corncob, and the corresponding lignin removal and enzymatic reduction of sugar concentration were 79.15% and 49.83 g/L, respectively; the highest energy conversion efficiency was 12.08%. The hydrogen production delay period was shortened, and the maximum shortening time was 18.9 h. Moreover, the cellulose content in pretreated corncob was positively correlated with both reducing sugar concentration and hydrogen yield and had the strongest influence on hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Effect of deep eutectic solvent pretreatment on biohydrogen production from corncob: pretreatment temperature and duration

Zhou,

Li,

et al. 2023

Bioengineered

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“…After the completion of dark fermentation experiments, the samples from all the bioreactors were analyzed for short-chain fatty acid determination. Soluble metabolites are critical indicators to determine the fermentation type and evaluate the process performance [27]. Figure 4 illustrates that acetic acid, propionic acid, and isobutyric acid were found to be major acids, while butyric acid, isovaleric acid, valeric acid, 4-methylvaleric acid, and caproic acid were observed in minor concentration.…”

Section: Effect Ofmentioning

confidence: 99%

“…Previous studies have shown that acetate-type fermentation remains the dominant metabolic pathway even after various pretreatment methods [27]. The metabolic pathway involving acetic acid can be represented by the following equation (Eq.…”

Section: Effect Ofmentioning

confidence: 99%

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Lipopeptide Biosurfactants Enhanced Biohydrogen Evolution from Lignocellulose Biomass and Shaped the Microbial Community and Diversity

Phulpoto,

Bobo,

Qazi

et al. 2024

International Journal of Energy Research

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Biohydrogen is a renewable and clean energy source that can be produced from cheap and abundantly available lignocellulose biomass. However, the complex structure of lignocellulose requires various physicochemical and biological pretreatments, as it exhibits significant resistance to microbial degradation. Biosurfactants can play a vital role in facilitating the microbial degradation of lignocellulose and inducing enzymatic hydrolysis. In addition, they can lower the surface tension to impede lignin-cellulase interactions and alter the lignin characteristics. Indeed, the application of lipopeptide biosurfactants to enhance hydrogen production from lignocellulose biomass is poorly studied. Thus, this study investigates the influence of lipopeptide biosurfactants on biohydrogen enhancement from lignocellulose biomass and their impact on short-chain fatty acid generation during anaerobic dark fermentation. Subsequently, Illumina HiSeq 2500 sequencing was employed to analyze the structure of microbial community and diversity significantly affected by the presence or absence of aided biosurfactants. Results revealed that the lipopeptide biosurfactant significantly improved the cumulative biogas and hydrogen production. The maximum cumulative hydrogen yield was achieved in lipopeptide-assisted bioreactors including BioR_3, BioR_2, and BioR_4 (i.e., 4.68, 4.56, and 4.50 mmol/2 g of substrate, respectively), showing an increase of 30.79% to 36.03% higher than BioR_1 (3.44 mmol). In addition, lipopeptide biosurfactants also impacted the short-chain fatty acid generation, where acetic acid, propionic acid, and isobutyric acid were found as major acids. On the other hand, various bacterial phyla, including Firmicutes, Proteobacteria, Actinobacteria, Chloroflexi, Planctomycetota, and Acidobacteriota, were detected in all bioreactors. Among the phyla, Firmicutes were predominated (54.74% to 86.38%) in lipopeptide-assisted bioreactors, indicating that biosurfactants substantially influenced the microbial community structure during hydrogen production. Besides, Ruminiclostridium and Bacillus were significantly promoted in lipopeptide-assisted bioreactors, representing efficient lignocellulose-degrading and hydrogen-producing genera. Conclusively, this study offers valuable insights into the underlying mechanism through which lipopeptide biosurfactants actively participate in biohydrogen production and illuminates the variations occurring within microbial communities.

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“…Furthermore, it considers both the electricity price for non- household customers, 61 as well as the output associated to the energy content of the hydrochar. 21 Moreover, the energy valorization of process water by AD for obtaining biogas, 62 or by dark fermentation 63 or aqueous phase reforming 64 to produce hydrogen, adds outputs to the process. According to Medina-Martos et al (2020), 65 the energy input for HTT of sewage sludge at 210 °C for 1 h coupled to an AD stage resulted in an energy cost of around 10 € per tonne of treated sewage sludge, which is in accordance with the cost of estimation of our process.…”

Section: −mentioning

confidence: 99%

Comparison of Nutrient-Release Strategies in Hydrothermally Treated Digested Sewage Sludge

Sarrión

Rubia

Berge

et al. 2023

ACS Sustainable Chem. Eng.

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This work studies the fate of nutrients (N, P, and K) during the hydrothermal treatment of anaerobically digested sewage sludge to raise their concentrations in the liquid phase and facilitate their recovery as solid minerals by chemical precipitation. The hydrothermal process has been optimized by evaluating the temperature (170–230 °C) and reaction time (5–60 min) in an acid-free medium or with the addition of HCl (0.1–0.5 M). In the acid-free hydrothermal reactions, nutrients were mainly concentrated in the hydrochar, which were extracted with 0.5 M HCl (10% w/v). Following this route, 6.9 g N/kg, 13.8 g P/kg, and 8.8 g K/kg contained in the feedstock were extracted from the hydrochar produced at 230 °C, which, considering direct nutrient solubilization to process water by acid-free hydrothermal treatments, accounts for 82, 83, and 78% N, P, and K release, respectively. In the HCl-assisted hydrothermal treatment, the release of nutrients directly into the process water was improved and depended mainly on the acid concentration used and to a lesser extent on the reaction temperature. Operating at 230 °C and 0.5 M HCl, the release of 98% N (more than 45% as NH4–N), 87% P (as PO4–P), and 70% K contained in the feedstock was achieved in the process water. Chemical precipitation of phosphorus and nitrogen from the process water allowed the recovery of a solid identified as crystalline struvite, with high contents in P, Mg, and NH4–N and negligible heavy-metal content. The estimated cost of digested sewage sludge treatment could reach 13.7 euros per tonne, considering the energy inputs required in the hydrothermal treatment.

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Integrated process to produce biohydrogen from wheat straw by enzymatic saccharification and dark fermentation

Cited by 26 publications

References 51 publications

Effect of deep eutectic solvent pretreatment on biohydrogen production from corncob: pretreatment temperature and duration

Effect of deep eutectic solvent pretreatment on biohydrogen production from corncob: pretreatment temperature and duration

Lipopeptide Biosurfactants Enhanced Biohydrogen Evolution from Lignocellulose Biomass and Shaped the Microbial Community and Diversity

Comparison of Nutrient-Release Strategies in Hydrothermally Treated Digested Sewage Sludge

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