Phenols in anaerobic digestion processes and inhibition of ammonia oxidising bacteria (AOB) in soil

Levén, Lotta; Nyberg, Karin; Korkea-aho, Lena; Schnürer, Anna

doi:10.1016/j.scitotenv.2005.06.003

Cited by 57 publications

(15 citation statements)

References 26 publications

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“…It has also been shown that anaerobically digested residues originating from source-separated organic waste and industrial food waste can contain high concentrations of organic pollutants such as polycyclic aromatic hydrocarbons (PAH) and diethylhexyl phthalate (DEHP), as well as high concentrations of fungicides such as imazalil and thiabendazole [56], which might affect soil microorganisms negatively. Residues generated from anaerobic digestion at thermophilic temperatures affect ammonia oxidation more negatively than mesophilic digestates [57], since the degradation of organic pollutants is more efficient under lower temperatures [8,51]. This could also be the explanation for the higher EC 10 values observed for PAO in the present study upon addition of BD-A and BD-D compared with the other two BDs, as the former digestates originated from mesophilic processes.…”

Section: Ammonia Oxidation and Denitrification Activitymentioning

confidence: 58%

“…One possible explanation for this inhibitory effect could be pollutants contained in these residues, and, hence, the results should be considered an early warning of potential contamination. It has been shown that ammonia oxidation is sensitive to pollutants that are commonly found in PS and BDs, for example, phenols [51]. Furthermore, anaerobically digested residue contains various organic compounds such as fatty acid esters [52,53], which affect ammonia oxidation negatively [54,55].…”

Section: Ammonia Oxidation and Denitrification Activitymentioning

confidence: 99%

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Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Abubaker

Risberg

Jönsson

et al. 2015

Applied and Environmental Soil Science

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The effect of four biogas digestates (BD-A, BD-B, BD-C, and BD-D) and pig slurry (PS) on soil microbial functions was assessed at application rates corresponding to 0-1120 kg NH 4 + -N ha −1 . At dose corresponding to 140 kg NH 4 + -N ha −1 , 30.9-32.5% of the carbon applied in BD-A, BD-C, and PS was utilized during 12 days, while for BD-B and BD-D corresponding utilization was 19.0 and 16.9%, respectively. All BDs resulted in net nitrogen assimilation at low rates (17.5-140 kg NH 4 + -N ha −1 ) but net mineralization dominated at higher rates. PS resulted in net mineralization at all application rates. All residues inhibited potential ammonium oxidation (PAO), with EC 50 -values ranging between 45 and 302 kg NH 4 + -N ha −1 . Low rates of BDs appeared to weakly stimulate potential denitrification activity (PDA), while higher rates resulted in logarithmic decrease. The EC 50 -values for PDA were between 238 and 347 kg NH 4 + -N ha −1 . No inhibition of PDA was observed after amendment with PS. In conclusion, biogas digestates inhibited ammonia oxidation and denitrification, which could be an early warning of potential hazardous substances in the digestates. However, this effect can also be regarded as positive, since it may reduce nitrogen losses.

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Section: Ammonia Oxidation and Denitrification Activitymentioning

confidence: 58%

Section: Ammonia Oxidation and Denitrification Activitymentioning

confidence: 99%

Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Abubaker

Risberg

Jönsson

et al. 2015

Applied and Environmental Soil Science

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“…At high concentrations such compounds can inhibit organic fraction degradation, stopping the process of degradation and the biogas production (Fedorak and Hrudey, 1984;Hernandez and Edyvean, 2008). Moreover, if the degradation of phenol is not complete, the digestate used as fertilizer can contain this pollutant (Angelidaki et al, 2000;Levén et al, 2006) and have adverse effects on soil bacteria, representing a risk for the environment and human health. In this context, it is necessary to make sure that phenol is completely degraded into methane, thus avoiding the methanization inhibition and assuring that digestates contain no phenol when introducing into the soil ecosystem.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, several studies have shown that phenol degradation at 55 °C under methanogenic conditions was possible (Karlsson et al, 1999;Fang et al, 2005;Levén et al, 2006;Chen et al, 2008;Limam et al, 2013), but the knowledge regarding the thermophilic phenol metabolic pathway is limited due to the fast degradation rates which hamper metabolite accumulation and pathway elucidation. Nevertheless, today it is generally accepted that thermophilic phenol degradation occurs via caproate (Fang et al, 2005) and not through the benzoic acid pathway, generally used in the mesophilic condition Winter, 1987, 1989;Béchard et al, 1990;Gallert et al, 1991;Karlsson et al, 1999;Levén and Schnürer, 2005;Zhang et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the thermophilic phenol biodegradation pathway via benzoate during the anaerobic digestion of municipal solid waste

et al. 2014

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Anaerobic digestion makes it possible to valorize municipal solid waste (MSW) into biogas and digestate which are, respectively, a renewable energy source and an organic amendment for soil. Phenols are persistent pollutants present in MSW that can inhibit the anaerobic digestion process and have a toxic effect on microbiota if they are applied to soil together with digestate. It is then important to define the operational conditions of anaerobic digestion which allow the complete degradation of phenol. In this context, the fate of phenol during the anaerobic digestion of MSW at 55°C was followed using an isotopic tracing approach ((13)C6-phenol) in experimental microcosms with inoculum from an industrial thermophilic anaerobic digester. With this approach, it was possible to demonstrate the complete phenol biodegradation into methane and carbon dioxide via benzoate. Benzoate is known to be a phenol metabolite under mesophilic conditions, but in this study it was found for the first time to be a phenol degradation product at thermophilic temperature.

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“…The condensables from the wheat-rye chaff torrefaction contained many compounds (e.g., furans and phenolics), which are inhibitors to microbes [51,52], and many of these compounds are generally considered toxic to the environment. This result was confirmed by the results of the performed toxicity tests.…”

Section: Resultsmentioning

confidence: 99%

Torrefaction of Agricultural Residues: Effect of Temperature and Residence Time on the Process Products Properties

Jagodzińska

Czerep

Kudlek

et al. 2020

Journal of Energy Resources Technology

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To date, few studies on the potential utilization of agricultural residue torrefaction products have been performed. Thus, torrefaction product characterization aimed at its potential utilization was performed. Wheat-barley straw pellets and wheat-rye chaff were used in the study. The impact of the torrefaction temperature (280-320°C) on polycyclic aromatic hydrocarbons (PAHs) content in the biochar and noncondensable gas (noncondensables) composition was investigated. The impact of the torrefaction time (30-75 min) on the composition of the condensable volatiles (condensables) and their toxicity were also studied. The torrefaction process was performed in a batch-scale reactor. The PAH contents were measured using high-performance liquid chromatography (HPLC), and the noncondensables composition was measured online using a gas analyzer and then gas chromatograph with flame ionization detector (GC-FID). The condensables composition and main compound quantification were determined and quantified using gas chromatography-mass spectrometry (GC/MS). Three toxicity tests, for saltwater bacteria (Microtox ® bioassay), freshwater crustaceans (Daphtoxkit F magna ® ), and vascular plants (Lemna sp. growth inhibition test), were performed for the condensables. The PAHs content in the biochar, regardless of the torrefaction temperature, allows them to be used in agriculture. The produced torgas shall be co-combusted with full-caloric fuel because of its low calorific value. Toxic compounds (furans and phenols) were identified in the condensable samples, and regardless of the processing time, the condensables were classified as highly toxic. Therefore, they can be used either as pesticides or as an anaerobic digestion substrate after their detoxification.

show abstract

Phenols in anaerobic digestion processes and inhibition of ammonia oxidising bacteria (AOB) in soil

Cited by 57 publications

References 26 publications

Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Elucidation of the thermophilic phenol biodegradation pathway via benzoate during the anaerobic digestion of municipal solid waste

Torrefaction of Agricultural Residues: Effect of Temperature and Residence Time on the Process Products Properties

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