Electron flow of biological H2 production by sludge under simple thermal treatment: Kinetic study

Amin, Mohammad Mehdi; Taheri, Ensiyeh; Bina, Bijan; Ginkel, Steven W. Van; Ghasemian, Mohammad; Puad, Noor Illi Mohamad; Fatehizadeh, Ali

doi:10.1016/j.jenvman.2019.109461

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…In our recent work, the performances of BioH 2 yield (HY) versus rates (HER) from DF among different literatures were rigorously compared [2]. It was found that the averaged value of HY = 1 mol•mol −1 for HER = 0.3 (mol.L −1 •h −1 ) generally agrees well with most of the reported values with the exception of two reports [67,69], of which HER values reach 6 and 10 (mol.L −1 •h −1 ), respectively. For these two relative higher HER in the region (I), they both employed a mixed culture of microbes isolated from activated sludge and the substrates used for cultivation were sucrose and lactate, respectively.…”

Section: Electron-equivalent Balances In Bioh 2 Productionssupporting

confidence: 88%

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

et al. 2020

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This paper reviews the current technological development of bio-hydrogen (BioH2) generation, focusing on using lignocellulosic feedstock via dark fermentation (DF). Using the collected reference reports as the training data set, supervised machine learning via the constructed artificial neuron networks (ANNs) imbedded with feed backward propagation and one cross-out validation approach was deployed to establish correlations between the carbon sources (glucose and xylose) together with the inhibitors (acetate and other inhibitors, such as furfural and aromatic compounds), hydrogen yield (HY), and hydrogen evolution rate (HER) from reported works. Through the statistical analysis, the concentrations variations of glucose (F-value = 0.0027) and acetate (F-value = 0.0028) were found to be statistically significant among the investigated parameters to HY and HER. Manipulating the ratio of glucose to acetate at an optimal range (approximate in 14:1) will effectively improve the BioH2 generation (HY and HER) regardless of microbial strains inoculated. Comparative studies were also carried out on the evolutions of electron equivalent balances using lignocellulosic biomass as substrates for BioH2 production across different reported works. The larger electron sinks in the acetate is found to be appreciably related to the higher HY and HER. To maintain a relative higher level of the BioH2 production, the biosynthesis needs to be kept over 30% in batch cultivation, while the biosynthesis can be kept at a low level (2%) in the continuous operation among the investigated reports. Among available solutions for the enhancement of BioH2 production, the selection of microbial strains with higher capacity in hydrogen productions is still one of the most phenomenal approaches in enhancing BioH2 production. Other process intensifications using continuous operation compounded with synergistic chemical additions could deliver additional enhancement for BioH2 productions during dark fermentation.

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Section: Electron-equivalent Balances In Bioh 2 Productionssupporting

confidence: 88%

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

et al. 2020

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“…SMPs mainly consist of ethanol and VFAs (acetate, propionate, and butyrate). The conversion of e – equiv values are as follows: 1 mol of glucose 24 e – equiv, 1 mol of ethanol 12 e – equiv, 1 mol of acetate 8 e – equiv, 1 mol of propionate 14 e – equiv, 1 mol of butyrate 20 e – equiv, 1 mol of hydrogen 2 e – equiv, and 1 mol of biomass (C 5 H 7 O 2 N) 20 e – equiv. , The electronic balance of 600 mg/L NDBC, 600 mg/L BC, and control groups were calculated, and the closure of the electronic equivalent balance were 6.317, 8.462, and 11.057%, respectively (see Table ). Besides, other studies showed that the electron equivalent balances ranged from −13 to 18%. − …”

Section: Resultsmentioning

confidence: 99%

Biohydrogen Production Amended with Nitrogen-Doped Biochar

et al. 2021

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Conductive materials play a vital role in electron transfer during the hydrogen (H 2 ) fermentation process. In this work, a novel nitrogen-doped biochar (NDBC) was produced from corncob to improve biohydrogen production at 37 °C. Material analysis revealed that the nitrogen-rich biochar (BC) had a specific surface area of 831.13 m 2 /g, which was slightly lower than that of the corncob-derived BC (944.09 m 2 /g), while the electrical conductivity of the former was 13.91 times higher than that of the latter. The highest H 2 yield of 230 mL/g glucose was obtained at 600 mg/L NDBC, which was higher than the corncob-derived BC (159 mL/g glucose) and control (without any BC) (140 mL/g glucose) group yields. The microbial community structure illustrated that NDBC greatly reduced the abundance of Dysgonomonas (9.2%) and increased the abundance of Clostridium butyricum (10.9%). The NDBC and corncob-derived BC materials played obviously different roles: the former enriched the dominant bacteria and acted as an electron conduit promoting electron transfer, while the latter mainly provided favorable sites for microbial colonization. The results also indicated that cleaner energy production with a high H 2 yield was attained with the nitrogen-doped BC material.

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“…In the H 2 production by dark fermentation process at present, during carbon conversion to various organic acids and alcohols, H 2 is not produced from the simple oxidation reactions of glucose to CO 2 and water (4,6). The maximum H 2 production via dark fermentation is related to the operational pH, substrate concentration (various carbohydrates), influent nutrients (N and P), hydraulic retention time (HRT), partial pressure of H 2 , stirring rate, sludge pretreatment methods (e.g., thermal or acid or alkaline pretreatment), and the absence or activity inhibition of hydrogenotrophic methanogens (7)(8)(9)(10). Previous studies on the H 2 bioreactors shows that the important design parameter is organic loading rate (OLR) (11).…”

Section: Introductionmentioning

confidence: 99%

Biological hydrogen production from synthetic wastewater by an anaerobic migrating blanket reactor: Artificial neural network (ANN) modeling

Ghasemian

Taheri

Fatehizadeh

et al. 2019

Environ Health Eng Manag

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Background: This study aimed to evaluate an anaerobic migrating blanket reactor (AMBR) for biological hydrogen production, and also to investigate its capability to treat synthetic wastewater. Methods: A five-compartment AMBR (9 L effective volume) was made by Plexiglas and seeded with thermal pretreated anaerobic sludge at 100°C for 30 minutes. The AMBR was operated at mesophilic temperature (37 ± 1°C) with continuous fed of synthetic wastewater at five organic loading rates (OLRs) of 0.5 to 8 g COD/L.d. Results: It was revealed that as the OLR increased from 0.5 to 8 g COD/L.d, the hydrogen production and also volumetric hydrogen production rate (VHPR) improved. Increasing the OLR over this range, led to a decrease in the average hydrogen yield from 1.58 ± 0.34 to 0.97 ± 0.45 mol H2 /mol glucose. The concentration of both volatile fatty acids (VFAs) and solvents kept increasing with OLR. During the AMBR operation, the dominant soluble end products (SEPs) were acetic and butyric acids in all of the OLRs studied. Conclusion: Based on the results, the hydrogen yield was related to the acetate/butyrate fermentation. The artificial neural network (ANN) model was well-fitted to the experimental obtained data from the AMBR, and was able to simulate the chemical oxygen demand (COD) removal and hydrogen production

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Electron flow of biological H2 production by sludge under simple thermal treatment: Kinetic study

Cited by 6 publications

References 39 publications

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

A Review of Biohydrogen Productions from Lignocellulosic Precursor via Dark Fermentation: Perspective on Hydrolysate Composition and Electron-Equivalent Balance

Biohydrogen Production Amended with Nitrogen-Doped Biochar

Biological hydrogen production from synthetic wastewater by an anaerobic migrating blanket reactor: Artificial neural network (ANN) modeling

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