Comparison of different models of substrate and product inhibition in anaerobic digestion

Mösche, Marek; Jördening, Hans‐Joachim

doi:10.1016/s0043-1354(98)00490-4

Cited by 61 publications

(42 citation statements)

References 16 publications

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“…1 (a)). The morphology was similar with the results of Yang et al 19) in fluidized bed reactor and Aguilar et al 16) in CSTR with acetate as sole organic substrate, and resembled with the findings of Uemura and Harada 20) in thermophilic UASB and Mösche and Jördening 21) in fluidized bed reactor with acetate as main substrate. The microscopic observation was also in agreement with the morphological descriptions of these two kinds of methanogens by Lange and Ahring 22) .…”

Section: Morphology Of Acetate and Propionate Pregrown Inoculasupporting

confidence: 89%

“…Fig. 2(a), it was observed that propionate degradation started only when initial acetate was almost completely degraded, which was in agreement with the results of Öztürk 23) in the first feeding treatment of acetate, propionate and butyrate mixtures with molasses-pregrown inocula and the results of Mösche and Jördening 21) in treating the acetate and propionate mixtures with anaerobic sludge from a sugar factory wastewater treatment plant.…”

Section: Morphology Of Acetate and Propionate Pregrown Inoculasupporting

confidence: 88%

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Kinetic Difference between Acetate and Propionate Pregrown Reactors through Batch Methanogenesis Experiments

Zhang

Yang

Lei

et al. 2008

Japanese J. Wat. Treat. Biol.

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Two pregrown inocula, pre-acclimated to acetate and propionate respectively and mainly composed of coccus, diplococcus-shaped Methanosarcina-like cells and a few filamentous Methanothrix-like cells, were used separately in batch experiments to investigate the effects of varied initial acetate or propionate concentrations on methanogenesis of mixed acetate and propionate substrate under controlled neutral pH and 35±1℃ conditions. The results indicated that acetate pregrown systems exhibited excellent and stable degradation potentials for acetate, with maximum specific substrate degradation rate (qmax) ranging from 1100 to 1900 mg/g-VSS/d when initial acetate and propionate less than 3300 mg/l and 750 mg/l, respectively. Under the same conditions, no distinctive difference in methane production was found for both pregrown systems, with the highest methane production rates of 107-117 ml/l-reactor/d and methane yields ranging from 0.31 to 0.36 l/g-COD removed. The average acetate and propionate degradation rates obtained were 66.7-307.2 and 3.8-86.0 mg/l-reactor/d and 26.7-265.7 and 5.8-92.0 mg/l-reactor/d for acetate pregrown and propionate pregrown systems, respectively, which were found to have some negative correlations with initial propionate/ acetate(P/A) ratio (0-3.0) and initial VFA load (165.7-436.1 mgCOD/l-reactor/d), respectively. It is still a challenge to maintain and control the effectiveness of propionate degradation in pregrown systems.

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Section: Morphology Of Acetate and Propionate Pregrown Inoculasupporting

confidence: 89%

Section: Morphology Of Acetate and Propionate Pregrown Inoculasupporting

confidence: 88%

Kinetic Difference between Acetate and Propionate Pregrown Reactors through Batch Methanogenesis Experiments

Zhang

Yang

Lei

et al. 2008

Japanese J. Wat. Treat. Biol.

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“…With acetate being a degradation product of other VFAs it is possible that the high concentrations of acetate in the period following the oleate addition could have caused a product inhibition resulting in a further increase in concentration and recovery time of other VFAs. Acetate is known to inhibit butyrate degradation at a concentration of 25 mM (Ahring and Westermann, 1988) and product inhibition of isovalerate and propionate degradation by acetate has been demonstrated as well (Mösche and Jördening, 1999;Pind et al, 2003). On the other hand propionate began to decrease 1-3 days after acetate had decreased and reached a stable level, which indicates that the syntrophic acetogens degrading propionate was more affected by the oleate pulses than the acetotrophic methanogens.…”

Section: Effect Of Oleate Pulses On the Biogas Processmentioning

confidence: 99%

Responses of the biogas process to pulses of oleate in reactors treating mixtures of cattle and pig manure

Nielsen

Ahring

2006

Biotech & Bioengineering

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The effect of oleate on the anaerobic digestion process was investigated. Two thermophilic continuously stirred tank reactors (CSTR) were fed with mixtures of cattle and pig manure with different total solid (TS) and volatile solid (VS) content. The reactors were subjected to increasing pulses of oleate. Following pulses of 0.5 and 1.0 g oleate/L, the most distinct increase in volatile fatty acid (VFA) concentrations were observed in the reactor with the lowest TS/VS content. This suggests a higher adsorption of oleate on the surfaces of biofibers in the reactor with the highest TS/VS and a less pronounced inhibition of the anaerobic digestion process. On the other hand, addition of 2.0 g oleate/L severely inhibited the process in both reactors, and a significant increase in all VFA concentrations combined with an immediate drop in methane production was noticed. However, 20 days after the reactors had been exposed to oleate both reactors showed a lower VFA concentration along with a higher methane production than before the pulses. This indicates that oleate had a stimulating effect on the overall process. The improved acetogenic and methanogenic activity in the reactors was confirmed in batch activity tests. In addition to this, toxicity tests revealed that the oleate pulses induced an increase in the tolerance level of acetotrophic methanogens towards oleate. When evaluating the usability of different process parameters (i.e., VFA and methane production) as indicators of process recovery, following the inhibition by oleate, propionate was found to be most suitable.

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“…Whereas, over the long-term, organic matter in the hay-rich bioreactors appeared to be degrading 2-3 times as fast as that in the wood-rich bioreactors. limits the rate of its production through product inhibition, which has been reported for anaerobic digestion [41]. After propionate drops to low concentrations at Port 3, propionate-producing fermenters appear to reinvigorate as suggested by the increases in propionate concentration towards the effluent port.…”

Section: Organic Matter Degradationmentioning

confidence: 84%

Decline in Performance of Biochemical Reactors for Sulphate Removal from Mine-Influenced Water is Accompanied by Changes in Organic Matter Characteristics and Microbial Population Composition

Mirjafari

Baldwin

2016

Water

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Successful long-term bioremediation of mining-influenced water using complex organic matter and naturally-occurring microorganisms in sub-surface flow constructed wetlands requires a balance between easily and more slowly degrading material. This can be achieved by combining different types of organic materials. To provide guidance on what mixture combinations to use, information is needed on how the ratio of labile to recalcitrant components affects the degradation rate and the types of microbial populations supported. To investigate this, different ratios of wood and hay were used in up-flow column bioreactors treating selenium-and sulphate-containing synthetic mine-influenced water. The degradation rates of crude fibre components appeared to be similar regardless of the relative amounts of wood and hay. However, the nature of the degradation products might have differed in that those produced in the hay-rich bioreactors were more biodegradable and supported high sulphate-reduction rates. Microorganisms in the sulphate-reducing and cellulose-degrading inocula persisted in the bioreactors indicating that bio-augmentation was effective. There was a shift in microbial community composition over time suggesting that different microbial groups were involved in decomposition of more recalcitrant material. When dissolved organic carbon (DOC) was over-supplied, the relative abundance of sulphate-reducers was low even through high sulphate-reduction rates were achieved. As DOC diminished, sulphate-reducers become more prevalent and their relative abundance correlated with sulphate concentrations rather than sulphate-reduction rate.

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Comparison of different models of substrate and product inhibition in anaerobic digestion

Cited by 61 publications

References 16 publications

Kinetic Difference between Acetate and Propionate Pregrown Reactors through Batch Methanogenesis Experiments

Kinetic Difference between Acetate and Propionate Pregrown Reactors through Batch Methanogenesis Experiments

Responses of the biogas process to pulses of oleate in reactors treating mixtures of cattle and pig manure

Decline in Performance of Biochemical Reactors for Sulphate Removal from Mine-Influenced Water is Accompanied by Changes in Organic Matter Characteristics and Microbial Population Composition

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