Phenylacetic acid in an anaerobic swine manure digester

Iannotti, E. L.; Mueller, Richard E.; Sievers, D. M.; Georgacakis, D.; Gerhardt, Klaus O.

doi:10.1007/bf01569417

Cited by 13 publications

(11 citation statements)

References 24 publications

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“…Consequently, severe disturbances in the form of a pH drop, an accumulation of VFAs (Table S1), and poor methane production performance (Figure 1) occurred. Moreover, the PAA concentration was highest in HCL samples, which supports previous assumptions that PAA could function as an early indicator for reactor disturbances/imbalances [9,13,22]. Most genera listed as significant LEfSe biomarkers (Table 2) and significant genera for mesophilic HCL samples are part of the order Clostridiales and depicted in Figure 2a.…”

Section: Discussionsupporting

confidence: 85%

“…Aromatic compounds like benzoate [12], p-cresol [5], or phenylacetate (PAA) [13,14] are associated with process instability and disturbances [9]. One major source for aromatic compounds are lignocellulosic materials often found in municipal and agricultural waste materials [15].…”

Section: Introductionmentioning

confidence: 99%

“…PAA, for example, was the focus of several studies concerning aromatic compound formation and their effects on anaerobic degradation [5,8,9,13,14]. However, information on the effects of PAA on the microbial community in general and on methanogenic Archaea, in particular, is still inconclusive due to the variety of aromatic compound sources, anaerobic digestion (AD) temperature regimes, and the inocula investigated.…”

Section: Introductionmentioning

confidence: 99%

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Microbial and Phenyl Acid Dynamics during the Start-up Phase of Anaerobic Straw Degradation in Meso- and Thermophilic Batch Reactors

et al. 2019

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Aromatic compounds like phenyl acids derived from lignocellulose degradation have been suspected to negatively influence biogas production processes. However, results on this topic are still inconclusive. To study phenyl acid formation in batch reactors during the start-up phase of anaerobic degradation, different amounts of straw from grain were mixed with mesophilic and thermophilic sludge, respectively. Molecular biological parameters were assessed using next-generation sequencing and qPCR analyses. Metagenomic predictions were done via the program, piphillin. Methane production, concentrations of phenylacetate, phenylpropionate, phenylbutyrate, and volatile fatty acids were monitored chromatographically. Methanosarcina spp. was the dominant methanogen when high straw loads were effectively degraded, and thus confirmed its robustness towards overload conditions. Several microorganisms correlated negatively with phenyl acids; however, a negative effect, specifically on methanogens, could not be proven. A cascade-like increase/decrease from phenylacetate to phenylpropionate, and then to phenylbutyrate could be observed when methanogenesis was highly active. Due to these results, phenylacetate was shown to be an early sign for overload conditions, whereas an increase in phenylbutyrate possibly indicated a switch from degradation of easily available to more complex substrates. These dynamics during the start-up phase might be relevant for biogas plant operators using complex organic wastes for energy exploitation.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbial and Phenyl Acid Dynamics during the Start-up Phase of Anaerobic Straw Degradation in Meso- and Thermophilic Batch Reactors

et al. 2019

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“…Unlike the VFAs that had a daily cycle in reactors fed with filtered thin stillage, the concentration of PAA varied very little throughout the day, it slightly increased up to 0.25 g/L. The same trend was previously recorded in an anaerobic swine manure digester . Table summarizes the metabolites detected after different time intervals within a period of 24 h. After 24 h almost all the intermediate metabolites were digested and, irrespective of the loading rate, similar MS profile was shown as in almost all stable reactors.…”

Section: Resultssupporting

confidence: 71%

High temperature biogas reactors to treat stillage from an industrial bioethanol process: Metabolic and microbial characterization

Sabra

Röske

Sahm

et al. 2015

Engineering in Life Sciences

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Stillage derived from bioethanol production process is a side stream conventionally used as feed additive after a cost‐intensive dehydration step. From economical and ecological points of view, it also represents an appealing substrate for biogas production. In this work, we examined the biomethanization of thin stillage in a stirred bioreactor under thermophilic conditions (55°C). Different organic loading rates and hydraulic residence times (HRTs) were tested over a long period of operation. Using thin stillage as a mono‐substrate, the maximum loading rate reached was 2.1 goTS/L/day (oTS, organic total solid). However, with the addition of a commercially available iron hydroxide additive, a maximum organic loading rate of 5.9 goTS/L/day was achieved. GC‐MS and denaturing gradient gel electrophoresis were used to study the metabolites and the microbial population dynamics within the biogas reactor under different process conditions. For all organic loading rates studied, volatile fatty acids were shown to give a clear indication of reactor instability. Products of aromatic amino acid degradation, especially phenyl acetic acid (PAA), were detected earlier in reactors even at very low organic loading rates. PAA concentration above 0.25 g/L indicated an unstable reactor performance and values above 0.5 g/L were found to be inhibitory to the biogas production in batch cultures.

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“…Eine Akkumulation von Phenylessigsäure wurde bereits von Iannotti et al [8] In den meisten Biogasanlagen wird der Gärprozess in Abhängigkeit vom Substratanfall beziehungsweise je nach Anforderungen des Gasmotors gesteuert. [9, modifiziert].…”

Section: Problemstellungunclassified

Bestimmung von Phenylessigsäure zur Früherkennung von Prozessstörungen in Biogasanlagen

Griehl

Hecht

Streuber

et al. 2010

Chemie Ingenieur Technik

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Phenylacetic acid in an anaerobic swine manure digester

Cited by 13 publications

References 24 publications

Microbial and Phenyl Acid Dynamics during the Start-up Phase of Anaerobic Straw Degradation in Meso- and Thermophilic Batch Reactors

Microbial and Phenyl Acid Dynamics during the Start-up Phase of Anaerobic Straw Degradation in Meso- and Thermophilic Batch Reactors

High temperature biogas reactors to treat stillage from an industrial bioethanol process: Metabolic and microbial characterization

Bestimmung von Phenylessigsäure zur Früherkennung von Prozessstörungen in Biogasanlagen

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