Process performance of biohydrogen production using glucose at various HRTs and assessment of microbial dynamics variation via q-PCR

Pugazhendhi, Arivalagan; Anburajan, Parthiban; Park, Jong‐Hun; Kumar, Gopalakrishnan; Sivagurunathan, Periyasamy; Kim, Jun Seok

doi:10.1016/j.ijhydene.2017.06.184

Cited by 45 publications

(15 citation statements)

References 33 publications

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“…Kan (2013) used different biomass pretreatment methods to enhance hydrogen production, including heat treatment which suppressed the activity of some homoacetogens and base pretreatment (pH 10.0), which led to a larger range of VFAs produced. Many studies pre-treated the inoculum to enhance the hydrogen production (Zhang et al, 2007;Larriba et al, 2016;Pugazhendhi et al, 2017;de Menezes and Silva, 2019;Rodríguez-Valderrama et al, 2019), however the highest VFA production they achieved was lower than in the present study (Table 2). In addition, any studies that reported VFA production resulted in similar fluctuations for the individual fermented compounds (Cisneros-Pérez et al, 2017;Mota et al, 2018;Muñoz-Páez et al, 2020).…”

Section: Conversion Of Carbon Compoundscontrasting

confidence: 67%

“…Many studies have focused on the production of hydrogen as the main product of dark fermentation, without optimisation for VFA production. In addition, many report the average VFA value and not the continuous VFA production (Pugazhendhi et al, 2017;de Menezes and Silva, 2019;Rodríguez-Valderrama et al, 2019). In all these studies, and the present study, a decrease in HRT resulted in higher butyric acid production and lower total VFA production.…”

Section: Conversion Of Carbon Compoundssupporting

confidence: 60%

“…In all these studies, and the present study, a decrease in HRT resulted in higher butyric acid production and lower total VFA production. Pugazhendhi et al (2017) obtained the highest VFA production, a mixture of acetic, butyric and propionic acid, at a HRT of 3 h using glucose as feedstock in a fixed bed reactor (Table 2). On the other hand, the highest HY occurred at a 1.5 h HRT with an increase in the butyric acid concentration and a decrease in overall VFA production (Pugazhendhi et al, 2017).…”

Section: Conversion Of Carbon Compoundsmentioning

confidence: 99%

“…Pugazhendhi et al (2017) obtained the highest VFA production, a mixture of acetic, butyric and propionic acid, at a HRT of 3 h using glucose as feedstock in a fixed bed reactor (Table 2). On the other hand, the highest HY occurred at a 1.5 h HRT with an increase in the butyric acid concentration and a decrease in overall VFA production (Pugazhendhi et al, 2017). Furthermore, in the present study, operating the system at longer HRT (36 h) resulted in a higher yield in terms of VFA production as a function of TC consumed: 1.28 (±0.13) and 1.38 (±0.13) mmol VFA/mmol TC, respectively, R1 and R2.…”

Section: Conversion Of Carbon Compoundsmentioning

confidence: 99%

“…One of the difficulties is, however, to maintain consistent VFA production, despite shifts in microbial community composition and changes in bioreactor performance (Cisneros-Pérez et al, 2017). The accumulation of organic compounds in the reactor mixed liquor can alter reaction kinetics in the microbial metabolic pathways of acidogenesis and methanogenesis (Ciranna et al, 2014;Pugazhendhi et al, 2017;de Menezes and Silva, 2019). This can activate or inactivate the consumption of hydrogen by different microorganisms, resulting in unstable hydrogen and VFA production (Saady, 2013;Regueira et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Continuous Volatile Fatty Acid Production From Acid Brewery Spent Grain Leachate in Expanded Granular Sludge Bed Reactors

Castilla-Archilla

Heiberger

Mills

et al. 2021

Front. Sustain. Food Syst.

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The production of volatile fatty acids (VFAs) in expanded granular sludge bed (EGSB) reactors using leachate from thermal diluted acid hydrolysis of brewery spent grain was evaluated. Partial inhibition of the anaerobic digestion process to induce VFA accumulation was achieved by applying a high organic loading rate [from 15.3 to 46.0 gCOD/(L·day)], and using a feed with an inlet concentration of 15 g/L total carbohydrates. Two EGSB reactors were operated under identical conditions, both inoculated with the same granular sludge. However, granular sludge in one reactor (R1) was subsequently disaggregated to flocculent sludge by a pH shock, whereas granules remained intact in the other reactor (R2). The hydraulic retention time (HRT) of both reactors was decreased from 36 to 24, 18 and 12 h. The main fermented compounds were acetic acid, butyric acid, propionic acid and ethanol. Despite fluctuations between these products, their total concentration was quite stable throughout the trial at about 134.2 (±27.8) and 141.1 (±21.7) mmol/L, respectively, for R1 and R2. Methane was detected at the beginning of the trial, and following some periods of instability in the granular sludge reactor (R2). The hydrogen yield increased as the HRT decreased. The highest VFA production was achieved in the granular sludge reactor at a 24 h HRT, corresponding to 120.4 (±15.0) mmol/L of VFAs. This corresponded to an acidification level of 83.4 (±5.9) g COD of VFA per 100 gram of soluble COD.

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