Effects of operational disturbance and subsequent recovery process on microbial community during a pilot-scale anaerobic co-digestion

Nguyen, Anh Q.; Nguyen, Luong N.; Phan, Hop V.; Galway, Brendan; Bustamante, Heriberto

doi:10.1016/j.ibiod.2019.01.002

Cited by 17 publications

(17 citation statements)

References 43 publications

(53 reference statements)

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“…3). These values are lower than that typically obtained from the anaerobic digestion of municipal solid waste, waste activated sludge and organic wastes (Nghiem et al, 2014;Nguyen et al, 2019a). This result is likely due to the limitation in hydrolysis and acidogenesis of lignocellulosic biomass by anaerobic sludge microbes.…”

Section: Biogas Productionmentioning

confidence: 57%

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Application of rumen and anaerobic sludge microbes for bio harvesting from lignocellulosic biomass

Nguyen

Johir

et al. 2019

Chemosphere

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This study investigated the production of biogas, volatile fatty acids (VFAs), and other soluble organic from lignocellulosic biomass by two microbial communities (i.e. rumen fluid and anaerobic sludge). Four types of abundant lignocellulosic biomass (i.e. wheat straw, oaten hay, lurence hay and corn silage) found in Australia were used. The results show that rumen microbes produced four-time higher VFAs level than that of anaerobic sludge reactors, indicating the possible application of rumen microorganism for VFAs generation from lignocellulosic biomass. VFA production in the rumen fluid reactors was probably due to the presence of specific hydrolytic and acidogenic bacteria (e.g. Fibrobacter and Prevotella).VFA production corroborated from the observation of pH drop in the rumen fluid reactors indicated hydrolytic and acidogenic inhibition, suggesting the continuous extraction of VFAs from the reactor. Anaerobic sludge reactors on the other hand, produced more biogas than that of rumen fluid reactors. This observation was consistent with the abundance of methanogens in anaerobic sludge inoculum (3.98% of total microbes) compared to rumen fluid (0.11%). VFA production from lignocellulosic biomass is the building block chemical for bioplastic, biohydrogen and biofuel. The results from this study provide important foundation for the development of engineered systems to generate VFAs from lignocellulosic biomass.

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Section: Biogas Productionmentioning

confidence: 57%

“…Anaerobic sludge was mixed with 100% ethanol (1:1 v/v) to preserve the cells. Detail sample preparation procedure is available elsewhere(Nguyen et al, 2019a). Briefly, samples were stored in an ice bag during transport and immediately transferred to -20 °C freezer upon arrival to the laboratory.…”

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confidence: 99%

Application of rumen and anaerobic sludge microbes for bio harvesting from lignocellulosic biomass

Nguyen

Johir

et al. 2019

Chemosphere

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“…At 0.85, methanogenesis was slightly better than at the level of 0.65. Such differences did not occur in fats (Nguyen et al 2019 ) or wheat straw (Byrne et al 2018 ). The reactors with inoculum only did not produce any biogas.…”

Section: Resultsmentioning

confidence: 95%

A shift from anaerobic digestion to dark fermentation in glycol ethylene fermentation

Sołowski

Zimiński

Cenian

2021

Environ Sci Pollut Res

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Anaerobic digestion of aqueous glycol ethylene was tested. The process lasted two cycles of 7 days, but after the second cycle, high hydrogen production occurred shift to dark fermentation. The biogas production lasted 14 days, obtaining peak values of hydrogen, and then rapidly stopped. In investigations, the following were checked: dependence of hydrogen, methane and hydrogen sulphide in the process. Mixtures of water with glycol ethylene mass ratio from 0.6 to 0.85 were substrates in experiments. The highest methane production was for water ethylene 0.7 ratio 2.85 L of methane with a yield of 178 mL of methane/g VSS (volatile suspended solids) of glycol ethylene. The optimal ratio of water and glycol ethylene was 0.85 25.5 mL of hydrogen (giving yield 1.71 mL of hydrogen/g VSS of glycol ethylene) and 1.71 mL of hydrogen sulphide emission for a 0.6 ratio. Popular polymer industry wastes, glycol ethylene, can be utilised by anaerobic digestion.

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“…This indicates that acetoclastic methanogenesis was the main methane-producing pathway. Overall, there was a good balance between different functional groups in both digesters, ensuring no product accumulation (e.g., volatile fatty acids) and allowing for process stability and efficiency . The high similarity between the two digester microbial profiles also explains the identical performance observed (Section ).…”

Section: Results and Discussionmentioning

confidence: 87%

Chiral Inversion of 2-Arylpropionic Acid Enantiomers under Anaerobic Conditions

Nguyễn

McDonald

et al. 2022

Environ. Sci. Technol.

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This work examined the chiral inversion of 2-arylpropionic acids (2-APAs) under anaerobic conditions and the associated microbial community. The anaerobic condition was simulated by two identical anaerobic digesters. Each digester was fed with the substrate containing 11 either pure (R)- or pure (S)-2-APA enantiomers. Chiral inversion was evidenced by the concentration increase of the other enantiomer in the digestate and the changes in the enantiomeric fraction between the two enantiomers. Both digesters showed similar and poor removal of 2-APAs (≤30%, except for naproxen) and diverse chiral inversion behaviors under anaerobic conditions. Four compounds exhibited (S → R) unidirectional inversion [flurbiprofen, ketoprofen, naproxen, and 2-(4-tert-butylphenyl)propionic acid], and the remaining seven compounds showed bidirectional inversion. Several aerobic and facultative anaerobic bacterial genera (Candidatus Microthrix, Rhodococcus, Mycobacterium, Gordonia, and Sphingobium) were identified in both digesters and predicted to harbor the 2-arylpropionyl-CoA epimerase (enzyme involved in chiral inversion) encoding gene. These genera presented at low abundances, <0.5% in the digester dosed with (R)-2-APAs and <0.2% in the digester dosed with (S)-2-APAs. The low abundances of these genera explain the limited extent of chiral inversion observed in this study.

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Effects of operational disturbance and subsequent recovery process on microbial community during a pilot-scale anaerobic co-digestion

Abstract: Effects of operational disturbance and subsequent recovery process on microbial community during a pilot-scale anaerobic co-digestion

Cited by 17 publications

References 43 publications

Application of rumen and anaerobic sludge microbes for bio harvesting from lignocellulosic biomass

Application of rumen and anaerobic sludge microbes for bio harvesting from lignocellulosic biomass

A shift from anaerobic digestion to dark fermentation in glycol ethylene fermentation

Chiral Inversion of 2-Arylpropionic Acid Enantiomers under Anaerobic Conditions

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